Initial import of libart 2.3.21

AUTHORS

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+Raph Levien <raph@acm.org>

COPYING

@@ -0,0 +1,482 @@
+		  GNU LIBRARY GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1991 Free Software Foundation, Inc.
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Makefile.am

@@ -0,0 +1,177 @@
+noinst_PROGRAMS = testart testuta
+
+bin_SCRIPTS = \
+	libart2-config
+	
+noinst_SCRIPTS = gen_art_config.sh
+
+BUILT_SOURCES = art_config.h
+
+art_config.h:
+	./gen_art_config.sh > art_config.h
+
+EXTRA_DIST = 			\
+	libart.def		\
+	libart-config.in	\
+	libart-2.0.pc.in	\
+	libart-2.0-uninstalled.pc.in
+
+lib_LTLIBRARIES = libart_lgpl_2.la
+
+if PLATFORM_WIN32
+no_undefined = -no-undefined
+endif
+
+if OS_WIN32
+export_symbols = -export-symbols libart.def
+
+install-libtool-import-lib:
+	$(INSTALL) .libs/libart_lgpl_2.dll.a $(DESTDIR)$(libdir)
+uninstall-libtool-import-lib:
+	-rm $(DESTDIR)$(libdir)/libart_lgpl_2.dll.a
+else
+install-libtool-import-lib:
+uninstall-libtool-import-lib:
+
+libm = -lm
+endif
+
+if MS_LIB_AVAILABLE
+noinst_DATA = art_lgpl_2.lib
+
+install-ms-lib:
+	$(INSTALL) art_lgpl_2.lib $(DESTDIR)$(libdir)
+
+uninstall-ms-lib:
+	-rm $(DESTDIR)$(libdir)/art_lgpl_2.lib
+
+art_lgpl_2.lib : libart_lgpl_2.la
+	lib -name:libart_lgpl_2-@LIBART_MAJOR_VERSION@.dll -def:libart.def -out:$@
+
+else
+install-ms-lib:
+uninstall-ms-lib:
+endif
+
+libart_lgpl_2_la_SOURCES = \
+	art_affine.c \
+	art_alphagamma.c \
+	art_bpath.c \
+	art_gray_svp.c \
+	art_misc.c \
+	art_pixbuf.c \
+	art_rect.c \
+	art_rect_svp.c \
+	art_rect_uta.c \
+	art_render.c \
+	art_render_gradient.c \
+	art_render_mask.c \
+	art_render_svp.c \
+	art_rgb.c \
+	art_rgb_affine.c \
+	art_rgb_affine_private.c \
+	art_rgb_affine_private.h \
+	art_rgb_bitmap_affine.c \
+	art_rgb_pixbuf_affine.c \
+	art_rgb_rgba_affine.c \
+	art_rgb_a_affine.c \
+	art_rgba.c \
+	art_rgb_svp.c \
+	art_svp.c \
+	art_svp_intersect.c \
+	art_svp_ops.c \
+	art_svp_point.c \
+	art_svp_render_aa.c \
+	art_svp_vpath.c \
+	art_svp_vpath_stroke.c \
+	art_svp_wind.c \
+	art_uta.c \
+	art_uta_ops.c \
+	art_uta_rect.c \
+	art_uta_vpath.c \
+	art_uta_svp.c \
+	art_vpath.c \
+	art_vpath_bpath.c \
+	art_vpath_dash.c \
+	art_vpath_svp.c	\
+	libart-features.c
+
+libart_lgpl_2_la_LDFLAGS = -version-info @LIBART_VERSION_INFO@ $(no_undefined) $(export_symbols)
+libart_lgpl_2_la_LIBADD = $(libm)
+
+libart_lgplincdir = $(includedir)/libart-2.0/libart_lgpl
+libart_lgplinc_HEADERS = \
+	art_affine.h \
+	art_alphagamma.h \
+	art_bpath.h \
+	art_config.h \
+	art_filterlevel.h \
+	art_gray_svp.h \
+	art_misc.h \
+	art_pathcode.h \
+	art_pixbuf.h \
+	art_point.h \
+	art_rect.h \
+	art_rect_svp.h \
+	art_rect_uta.h \
+	art_render.h \
+	art_render_gradient.h \
+	art_render_mask.h \
+	art_render_svp.h \
+	art_rgb.h \
+	art_rgb_affine.h \
+	art_rgb_bitmap_affine.h \
+	art_rgb_pixbuf_affine.h \
+	art_rgb_rgba_affine.h \
+	art_rgb_a_affine.h \
+	art_rgb_svp.h \
+	art_rgba.h \
+	art_svp.h \
+	art_svp_intersect.h \
+	art_svp_ops.h \
+	art_svp_point.h \
+	art_svp_render_aa.h \
+	art_svp_vpath.h \
+	art_svp_vpath_stroke.h \
+	art_svp_wind.h \
+	art_uta.h \
+	art_uta_ops.h \
+	art_uta_rect.h \
+	art_uta_vpath.h \
+	art_uta_svp.h \
+	art_vpath.h \
+	art_vpath_bpath.h \
+	art_vpath_dash.h \
+	art_vpath_svp.h	\
+	libart.h	\
+	libart-features.h
+
+INCLUDES = -I$(top_srcdir) -I$(top_builddir) -DLIBART_COMPILATION
+
+DEPS = $(top_builddir)/libart_lgpl_2.la
+LDADDS = $(top_builddir)/libart_lgpl_2.la
+
+testart_SOURCES=testart.c
+testart_LDFLAGS =
+testart_DEPENDENCIES = $(DEPS)
+testart_LDADD = $(LDADDS) $(libm)
+
+testuta_SOURCES=testuta.c
+testuta_LDFLAGS =
+testuta_DEPENDENCIES = $(DEPS)
+testuta_LDADD = $(LDADDS) $(libm)
+
+tests:	testart testuta
+
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = libart-2.0.pc
+
+libart2-config: libart-config
+	cp -f libart-config libart2-config
+
+install-data-local: install-ms-lib install-libtool-import-lib
+
+uninstall-local: uninstall-ms-lib uninstall-libtool-import-lib
+
+CLEANFILES = $(BUILT_SOURCES) $(bin_SCRIPTS)
+DISTCLEANFILES = $(BUILT_SOURCES) $(bin_SCRIPTS)

NEWS

@@ -0,0 +1,35 @@
+==============
+Version 2.3.21
+==============
+
+- Allow crosscompiling without using different emulators (Fridrich Strba)
+
+==============
+Version 2.3.20
+==============
+
+- Fix including art_misc.h from C++
+
+==============
+Version 2.3.19
+==============
+
+- Fix typo that broke versioning. (Yanko Kaneti)
+
+==============
+Version 2.3.18
+==============
+
+- Port to automake 1.9 (Christian Persch)
+- Cygwin build fixes (Cygwin ports maintainer)
+- Fixes for memory management on win32 (Dom Lachowicz)
+- Compiler warning fixes (Kjartan, Tor Lillqvist)
+
+==============
+Version 2.3.17
+==============
+
+- Updated pkg-config files (Glynn Foster)
+- Distribute libart.def (Michael Meeks)
+- Add link to Mathieu's tutorial on libart (Kjartan)
+

README

@@ -0,0 +1,19 @@
+This is the LGPL'd component of libart. All functions needed for
+running the Gnome canvas, and for printing support, will be going in
+here. The GPL'd component will be getting various enhanced functions
+for specific applications.
+
+Libart is free software. It is also for sale. For information about
+licensing libart, please contact Raph Levien
+<raph@acm.org>. Contributions to the codebase are also very welcome,
+but the copyright must be assigned in writing to preserve the
+licensing flexibility.
+
+
+For more information about libart, see the web page:
+
+   http://www.levien.com/libart/
+
+There's also a libart tutorial available at
+http://www.gnome.org/~mathieu/libart/libart.html
+

art_affine.c

@@ -0,0 +1,458 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* Simple manipulations with affine transformations */
+
+#include "config.h"
+#include "art_affine.h"
+#include "art_misc.h" /* for M_PI */
+
+#include <math.h>
+#include <stdio.h> /* for sprintf */
+#include <string.h> /* for strcpy */
+
+
+/* According to a strict interpretation of the libart structure, this
+   routine should go into its own module, art_point_affine.  However,
+   it's only two lines of code, and it can be argued that it is one of
+   the natural basic functions of an affine transformation.
+*/
+
+/**
+ * art_affine_point: Do an affine transformation of a point.
+ * @dst: Where the result point is stored.
+ * @src: The original point.
+ @ @affine: The affine transformation.
+ **/
+void
+art_affine_point (ArtPoint *dst, const ArtPoint *src,
+		  const double affine[6])
+{
+  double x, y;
+
+  x = src->x;
+  y = src->y;
+  dst->x = x * affine[0] + y * affine[2] + affine[4];
+  dst->y = x * affine[1] + y * affine[3] + affine[5];
+}
+
+/**
+ * art_affine_invert: Find the inverse of an affine transformation.
+ * @dst: Where the resulting affine is stored.
+ * @src: The original affine transformation.
+ *
+ * All non-degenerate affine transforms are invertible. If the original
+ * affine is degenerate or nearly so, expect numerical instability and
+ * very likely core dumps on Alpha and other fp-picky architectures.
+ * Otherwise, @dst multiplied with @src, or @src multiplied with @dst
+ * will be (to within roundoff error) the identity affine.
+ **/
+void
+art_affine_invert (double dst[6], const double src[6])
+{
+  double r_det;
+
+  r_det = 1.0 / (src[0] * src[3] - src[1] * src[2]);
+  dst[0] = src[3] * r_det;
+  dst[1] = -src[1] * r_det;
+  dst[2] = -src[2] * r_det;
+  dst[3] = src[0] * r_det;
+  dst[4] = -src[4] * dst[0] - src[5] * dst[2];
+  dst[5] = -src[4] * dst[1] - src[5] * dst[3];
+}
+
+/**
+ * art_affine_flip: Flip an affine transformation horizontally and/or vertically.
+ * @dst_affine: Where the resulting affine is stored.
+ * @src_affine: The original affine transformation.
+ * @horiz: Whether or not to flip horizontally.
+ * @vert: Whether or not to flip horizontally.
+ *
+ * Flips the affine transform. FALSE for both @horiz and @vert implements
+ * a simple copy operation. TRUE for both @horiz and @vert is a
+ * 180 degree rotation. It is ok for @src_affine and @dst_affine to
+ * be equal pointers.
+ **/
+void
+art_affine_flip (double dst_affine[6], const double src_affine[6], int horz, int vert)
+{
+  dst_affine[0] = horz ? - src_affine[0] : src_affine[0];
+  dst_affine[1] = horz ? - src_affine[1] : src_affine[1];
+  dst_affine[2] = vert ? - src_affine[2] : src_affine[2];
+  dst_affine[3] = vert ? - src_affine[3] : src_affine[3];
+  dst_affine[4] = horz ? - src_affine[4] : src_affine[4];
+  dst_affine[5] = vert ? - src_affine[5] : src_affine[5];
+}
+
+#define EPSILON 1e-6
+
+/* It's ridiculous I have to write this myself. This is hardcoded to
+   six digits of precision, which is good enough for PostScript.
+
+   The return value is the number of characters (i.e. strlen (str)).
+   It is no more than 12. */
+static int
+art_ftoa (char str[80], double x)
+{
+  char *p = str;
+  int i, j;
+
+  p = str;
+  if (fabs (x) < EPSILON / 2)
+    {
+      strcpy (str, "0");
+      return 1;
+    }
+  if (x < 0)
+    {
+      *p++ = '-';
+      x = -x;
+    }
+  if ((int)floor ((x + EPSILON / 2) < 1))
+    {
+      *p++ = '0';
+      *p++ = '.';
+      i = sprintf (p, "%06d", (int)floor ((x + EPSILON / 2) * 1e6));
+      while (i && p[i - 1] == '0')
+	i--;
+      if (i == 0)
+	i--;
+      p += i;
+    }
+  else if (x < 1e6)
+    {
+      i = sprintf (p, "%d", (int)floor (x + EPSILON / 2));
+      p += i;
+      if (i < 6)
+	{
+	  int ix;
+
+	  *p++ = '.';
+	  x -= floor (x + EPSILON / 2);
+	  for (j = i; j < 6; j++)
+	    x *= 10;
+	  ix = floor (x + 0.5);
+
+	  for (j = 0; j < i; j++)
+	    ix *= 10;
+
+	  /* A cheap hack, this routine can round wrong for fractions
+	     near one. */
+	  if (ix == 1000000)
+	    ix = 999999;
+
+	  sprintf (p, "%06d", ix);
+	  i = 6 - i;
+	  while (i && p[i - 1] == '0')
+	    i--;
+	  if (i == 0)
+	    i--;
+	  p += i;
+	}
+    }
+  else
+    p += sprintf (p, "%g", x);
+
+  *p = '\0';
+  return p - str;
+}
+
+
+
+#include <stdlib.h>
+/**
+ * art_affine_to_string: Convert affine transformation to concise PostScript string representation.
+ * @str: Where to store the resulting string.
+ * @src: The affine transform.
+ *
+ * Converts an affine transform into a bit of PostScript code that
+ * implements the transform. Special cases of scaling, rotation, and
+ * translation are detected, and the corresponding PostScript
+ * operators used (this greatly aids understanding the output
+ * generated). The identity transform is mapped to the null string.
+ **/
+void
+art_affine_to_string (char str[128], const double src[6])
+{
+  char tmp[80];
+  int i, ix;
+
+#if 0
+  for (i = 0; i < 1000; i++)
+    {
+      double d = rand () * .1 / RAND_MAX;
+      art_ftoa (tmp, d);
+      printf ("%g %f %s\n", d, d, tmp);
+    }
+#endif
+  if (fabs (src[4]) < EPSILON && fabs (src[5]) < EPSILON)
+    {
+      /* could be scale or rotate */
+      if (fabs (src[1]) < EPSILON && fabs (src[2]) < EPSILON)
+	{
+	  /* scale */
+	  if (fabs (src[0] - 1) < EPSILON && fabs (src[3] - 1) < EPSILON)
+	    {
+	      /* identity transform */
+	      str[0] = '\0';
+	      return;
+	    }
+	  else
+	    {
+	      ix = 0;
+	      ix += art_ftoa (str + ix, src[0]);
+	      str[ix++] = ' ';
+	      ix += art_ftoa (str + ix, src[3]);
+	      strcpy (str + ix, " scale");
+	      return;
+	    }
+	}
+      else
+	{
+	  /* could be rotate */
+	  if (fabs (src[0] - src[3]) < EPSILON &&
+	      fabs (src[1] + src[2]) < EPSILON &&
+	      fabs (src[0] * src[0] + src[1] * src[1] - 1) < 2 * EPSILON)
+	    {
+	      double theta;
+
+	      theta = (180 / M_PI) * atan2 (src[1], src[0]);
+	      art_ftoa (tmp, theta);
+	      sprintf (str, "%s rotate", tmp);
+	      return;
+	    }
+	}
+    }
+  else
+    {
+      /* could be translate */
+      if (fabs (src[0] - 1) < EPSILON && fabs (src[1]) < EPSILON &&
+	  fabs (src[2]) < EPSILON && fabs (src[3] - 1) < EPSILON)
+	{
+	  ix = 0;
+	  ix += art_ftoa (str + ix, src[4]);
+	  str[ix++] = ' ';
+	  ix += art_ftoa (str + ix, src[5]);
+	  strcpy (str + ix, " translate");
+	  return;
+	}
+    }
+
+  ix = 0;
+  str[ix++] = '[';
+  str[ix++] = ' ';
+  for (i = 0; i < 6; i++)
+    {
+      ix += art_ftoa (str + ix, src[i]);
+      str[ix++] = ' ';
+    }
+  strcpy (str + ix, "] concat");
+}
+
+/**
+ * art_affine_multiply: Multiply two affine transformation matrices.
+ * @dst: Where to store the result.
+ * @src1: The first affine transform to multiply.
+ * @src2: The second affine transform to multiply.
+ *
+ * Multiplies two affine transforms together, i.e. the resulting @dst
+ * is equivalent to doing first @src1 then @src2. Note that the
+ * PostScript concat operator multiplies on the left, i.e.  "M concat"
+ * is equivalent to "CTM = multiply (M, CTM)";
+ *
+ * It is safe to call this function with @dst equal to @src1 or @src2.
+ **/
+void
+art_affine_multiply (double dst[6], const double src1[6], const double src2[6])
+{
+  double d0, d1, d2, d3, d4, d5;
+
+  d0 = src1[0] * src2[0] + src1[1] * src2[2];
+  d1 = src1[0] * src2[1] + src1[1] * src2[3];
+  d2 = src1[2] * src2[0] + src1[3] * src2[2];
+  d3 = src1[2] * src2[1] + src1[3] * src2[3];
+  d4 = src1[4] * src2[0] + src1[5] * src2[2] + src2[4];
+  d5 = src1[4] * src2[1] + src1[5] * src2[3] + src2[5];
+  dst[0] = d0;
+  dst[1] = d1;
+  dst[2] = d2;
+  dst[3] = d3;
+  dst[4] = d4;
+  dst[5] = d5;
+}
+
+/**
+ * art_affine_identity: Set up the identity matrix.
+ * @dst: Where to store the resulting affine transform.
+ *
+ * Sets up an identity matrix.
+ **/
+void
+art_affine_identity (double dst[6])
+{
+  dst[0] = 1;
+  dst[1] = 0;
+  dst[2] = 0;
+  dst[3] = 1;
+  dst[4] = 0;
+  dst[5] = 0;
+}
+
+
+/**
+ * art_affine_scale: Set up a scaling matrix.
+ * @dst: Where to store the resulting affine transform.
+ * @sx: X scale factor.
+ * @sy: Y scale factor.
+ *
+ * Sets up a scaling matrix.
+ **/
+void
+art_affine_scale (double dst[6], double sx, double sy)
+{
+  dst[0] = sx;
+  dst[1] = 0;
+  dst[2] = 0;
+  dst[3] = sy;
+  dst[4] = 0;
+  dst[5] = 0;
+}
+
+/**
+ * art_affine_rotate: Set up a rotation affine transform.
+ * @dst: Where to store the resulting affine transform.
+ * @theta: Rotation angle in degrees.
+ *
+ * Sets up a rotation matrix. In the standard libart coordinate
+ * system, in which increasing y moves downward, this is a
+ * counterclockwise rotation. In the standard PostScript coordinate
+ * system, which is reversed in the y direction, it is a clockwise
+ * rotation.
+ **/
+void
+art_affine_rotate (double dst[6], double theta)
+{
+  double s, c;
+
+  s = sin (theta * M_PI / 180.0);
+  c = cos (theta * M_PI / 180.0);
+  dst[0] = c;
+  dst[1] = s;
+  dst[2] = -s;
+  dst[3] = c;
+  dst[4] = 0;
+  dst[5] = 0;
+}
+
+/**
+ * art_affine_shear: Set up a shearing matrix.
+ * @dst: Where to store the resulting affine transform.
+ * @theta: Shear angle in degrees.
+ *
+ * Sets up a shearing matrix. In the standard libart coordinate system
+ * and a small value for theta, || becomes \\. Horizontal lines remain
+ * unchanged.
+ **/
+void
+art_affine_shear (double dst[6], double theta)
+{
+  double t;
+
+  t = tan (theta * M_PI / 180.0);
+  dst[0] = 1;
+  dst[1] = 0;
+  dst[2] = t;
+  dst[3] = 1;
+  dst[4] = 0;
+  dst[5] = 0;
+}
+
+/**
+ * art_affine_translate: Set up a translation matrix.
+ * @dst: Where to store the resulting affine transform.
+ * @tx: X translation amount.
+ * @tx: Y translation amount.
+ *
+ * Sets up a translation matrix.
+ **/
+void
+art_affine_translate (double dst[6], double tx, double ty)
+{
+  dst[0] = 1;
+  dst[1] = 0;
+  dst[2] = 0;
+  dst[3] = 1;
+  dst[4] = tx;
+  dst[5] = ty;
+}
+
+/**
+ * art_affine_expansion: Find the affine's expansion factor.
+ * @src: The affine transformation.
+ *
+ * Finds the expansion factor, i.e. the square root of the factor
+ * by which the affine transform affects area. In an affine transform
+ * composed of scaling, rotation, shearing, and translation, returns
+ * the amount of scaling.
+ *
+ * Return value: the expansion factor.
+ **/
+double
+art_affine_expansion (const double src[6])
+{
+  return sqrt (fabs (src[0] * src[3] - src[1] * src[2]));
+}
+
+/**
+ * art_affine_rectilinear: Determine whether the affine transformation is rectilinear.
+ * @src: The original affine transformation.
+ *
+ * Determines whether @src is rectilinear, i.e.  grid-aligned
+ * rectangles are transformed to other grid-aligned rectangles.  The
+ * implementation has epsilon-tolerance for roundoff errors.
+ *
+ * Return value: TRUE if @src is rectilinear.
+ **/
+int
+art_affine_rectilinear (const double src[6])
+{
+  return ((fabs (src[1]) < EPSILON && fabs (src[2]) < EPSILON) ||
+	  (fabs (src[0]) < EPSILON && fabs (src[3]) < EPSILON));
+}
+
+/**
+ * art_affine_equal: Determine whether two affine transformations are equal.
+ * @matrix1: An affine transformation.
+ * @matrix2: Another affine transformation.
+ *
+ * Determines whether @matrix1 and @matrix2 are equal, with
+ * epsilon-tolerance for roundoff errors.
+ *
+ * Return value: TRUE if @matrix1 and @matrix2 are equal.
+ **/
+int
+art_affine_equal (double matrix1[6], double matrix2[6])
+{
+  return (fabs (matrix1[0] - matrix2[0]) < EPSILON &&
+	  fabs (matrix1[1] - matrix2[1]) < EPSILON &&
+	  fabs (matrix1[2] - matrix2[2]) < EPSILON &&
+	  fabs (matrix1[3] - matrix2[3]) < EPSILON &&
+	  fabs (matrix1[4] - matrix2[4]) < EPSILON &&
+	  fabs (matrix1[5] - matrix2[5]) < EPSILON);
+}

art_affine.h

@@ -0,0 +1,93 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_AFFINE_H__
+#define __ART_AFFINE_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_point.h"
+#else
+#include <libart_lgpl/art_point.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+void
+art_affine_point (ArtPoint *dst, const ArtPoint *src,
+		  const double affine[6]);
+
+void
+art_affine_invert (double dst_affine[6], const double src_affine[6]);
+
+/* flip the matrix, FALSE, FALSE is a simple copy operation, and
+   TRUE, TRUE equals a rotation by 180 degrees */
+void
+art_affine_flip (double dst_affine[6], const double src_affine[6],
+                 int horz, int vert);
+
+void
+art_affine_to_string (char str[128], const double src[6]);
+
+void
+art_affine_multiply (double dst[6],
+		     const double src1[6], const double src2[6]);
+
+/* set up the identity matrix */
+void
+art_affine_identity (double dst[6]);
+
+/* set up a scaling matrix */
+void
+art_affine_scale (double dst[6], double sx, double sy);
+
+/* set up a rotation matrix; theta is given in degrees */
+void
+art_affine_rotate (double dst[6], double theta);
+
+/* set up a shearing matrix; theta is given in degrees */
+void
+art_affine_shear (double dst[6], double theta);
+
+/* set up a translation matrix */
+void
+art_affine_translate (double dst[6], double tx, double ty);
+
+
+/* find the affine's "expansion factor", i.e. the scale amount */
+double
+art_affine_expansion (const double src[6]);
+
+/* Determine whether the affine transformation is rectilinear,
+   i.e. whether a rectangle aligned to the grid is transformed into
+   another rectangle aligned to the grid. */
+int
+art_affine_rectilinear (const double src[6]);
+
+/* Determine whether two affine transformations are equal within grid allignment */
+int
+art_affine_equal (double matrix1[6], double matrix2[6]);
+
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_AFFINE_H__ */

art_alphagamma.c

@@ -0,0 +1,85 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* Some functions to build alphagamma tables */
+
+#include "config.h"
+#include "art_alphagamma.h"
+
+#include <math.h>
+
+/**
+ * art_alphagamma_new: Create a new #ArtAlphaGamma.
+ * @gamma: Gamma value.
+ *
+ * Create a new #ArtAlphaGamma for a specific value of @gamma. When
+ * correctly implemented (which is generally not the case in libart),
+ * alpha compositing with an alphagamma parameter is equivalent to
+ * applying the gamma transformation to source images, doing the alpha
+ * compositing (in linear intensity space), then applying the inverse
+ * gamma transformation, bringing it back to a gamma-adjusted
+ * intensity space.
+ *
+ * Return value: The newly created #ArtAlphaGamma.
+ **/
+ArtAlphaGamma *
+art_alphagamma_new (double gamma)
+{
+  int tablesize;
+  ArtAlphaGamma *alphagamma;
+  int i;
+  int *table;
+  art_u8 *invtable;
+  double s, r_gamma;
+
+  tablesize = ceil (gamma * 8);
+  if (tablesize < 10)
+    tablesize = 10;
+
+  alphagamma = (ArtAlphaGamma *)art_alloc (sizeof(ArtAlphaGamma) +
+					   ((1 << tablesize) - 1) *
+					   sizeof(art_u8));
+  alphagamma->gamma = gamma;
+  alphagamma->invtable_size = tablesize;
+
+  table = alphagamma->table;
+  for (i = 0; i < 256; i++)
+    table[i] = (int)floor (((1 << tablesize) - 1) *
+			   pow (i * (1.0 / 255), gamma) + 0.5);
+
+  invtable = alphagamma->invtable;
+  s = 1.0 / ((1 << tablesize) - 1);
+  r_gamma = 1.0 / gamma;
+  for (i = 0; i < 1 << tablesize; i++)
+    invtable[i] = (int)floor (255 * pow (i * s, r_gamma) + 0.5);
+
+  return alphagamma;
+}
+
+/**
+ * art_alphagamma_free: Free an #ArtAlphaGamma.
+ * @alphagamma: An #ArtAlphaGamma.
+ *
+ * Frees the #ArtAlphaGamma.
+ **/
+void
+art_alphagamma_free (ArtAlphaGamma *alphagamma)
+{
+  art_free (alphagamma);
+}

art_alphagamma.h

@@ -0,0 +1,55 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_ALPHAGAMMA_H__
+#define __ART_ALPHAGAMMA_H__
+
+/* Alphagamma tables */
+
+#ifdef LIBART_COMPILATION
+#include "art_misc.h"
+#else
+#include <libart_lgpl/art_misc.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef struct _ArtAlphaGamma ArtAlphaGamma;
+
+struct _ArtAlphaGamma {
+  /*< private >*/
+  double gamma;
+  int invtable_size;
+  int table[256];
+  art_u8 invtable[1];
+};
+
+ArtAlphaGamma *
+art_alphagamma_new (double gamma);
+
+void
+art_alphagamma_free (ArtAlphaGamma *alphagamma);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_SVP_H__ */

art_bpath.c

@@ -0,0 +1,92 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* Basic constructors and operations for bezier paths */
+
+#include "config.h"
+#include "art_bpath.h"
+
+#include <math.h>
+
+
+/**
+ * art_bpath_affine_transform: Affine transform an #ArtBpath.
+ * @src: The source #ArtBpath.
+ * @matrix: The affine transform.
+ *
+ * Affine transform the bezpath, returning a newly allocated #ArtBpath
+ * (allocated using art_alloc()).
+ *
+ * Result (x', y') = (matrix[0] * x + matrix[2] * y + matrix[4],
+ *                    matrix[1] * x + matrix[3] * y + matrix[5])
+ *
+ * Return value: the transformed #ArtBpath.
+ **/
+ArtBpath *
+art_bpath_affine_transform (const ArtBpath *src, const double matrix[6])
+{
+  int i;
+  int size;
+  ArtBpath *new;
+  ArtPathcode code;
+  double x, y;
+
+  for (i = 0; src[i].code != ART_END; i++);
+  size = i;
+
+  new = art_new (ArtBpath, size + 1);
+
+  for (i = 0; i < size; i++)
+    {
+      code = src[i].code;
+      new[i].code = code;
+      if (code == ART_CURVETO)
+	{
+	  x = src[i].x1;
+	  y = src[i].y1;
+	  new[i].x1 = matrix[0] * x + matrix[2] * y + matrix[4];
+	  new[i].y1 = matrix[1] * x + matrix[3] * y + matrix[5];
+	  x = src[i].x2;
+	  y = src[i].y2;
+	  new[i].x2 = matrix[0] * x + matrix[2] * y + matrix[4];
+	  new[i].y2 = matrix[1] * x + matrix[3] * y + matrix[5];
+	}
+      else
+	{
+	  new[i].x1 = 0;
+	  new[i].y1 = 0;
+	  new[i].x2 = 0;
+	  new[i].y2 = 0;
+	}
+      x = src[i].x3;
+      y = src[i].y3;
+      new[i].x3 = matrix[0] * x + matrix[2] * y + matrix[4];
+      new[i].y3 = matrix[1] * x + matrix[3] * y + matrix[5];
+    }
+  new[i].code = ART_END;
+  new[i].x1 = 0;
+  new[i].y1 = 0;
+  new[i].x2 = 0;
+  new[i].y2 = 0;
+  new[i].x3 = 0;
+  new[i].y3 = 0;
+
+  return new;
+}
+

art_bpath.h

@@ -0,0 +1,59 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_BPATH_H__
+#define __ART_BPATH_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_misc.h"
+#include "art_point.h"
+#include "art_pathcode.h"
+#else
+#include <libart_lgpl/art_misc.h>
+#include <libart_lgpl/art_point.h>
+#include <libart_lgpl/art_pathcode.h>
+#endif
+
+/* Basic data structures and constructors for bezier paths */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef struct _ArtBpath ArtBpath;
+
+struct _ArtBpath {
+  /*< public >*/
+  ArtPathcode code;
+  double x1;
+  double y1;
+  double x2;
+  double y2;
+  double x3;
+  double y3;
+};
+
+ArtBpath *
+art_bpath_affine_transform (const ArtBpath *src, const double matrix[6]);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_BPATH_H__ */

art_config.h

@@ -0,0 +1,10 @@
+/* Automatically generated by gen_art_config */
+
+#define ART_SIZEOF_CHAR 1
+#define ART_SIZEOF_SHORT 2
+#define ART_SIZEOF_INT 4
+#define ART_SIZEOF_LONG 4
+
+typedef unsigned char art_u8;
+typedef unsigned short art_u16;
+typedef unsigned int art_u32;

art_filterlevel.h

@@ -0,0 +1,68 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_FILTERLEVEL_H__
+#define __ART_FILTERLEVEL_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef enum {
+  ART_FILTER_NEAREST,
+  ART_FILTER_TILES,
+  ART_FILTER_BILINEAR,
+  ART_FILTER_HYPER
+} ArtFilterLevel;
+
+/* NEAREST is nearest neighbor. It is the fastest and lowest quality.
+
+   TILES is an accurate simulation of the PostScript image operator
+   without any interpolation enabled; each pixel is rendered as a tiny
+   parallelogram of solid color, the edges of which are implemented
+   with antialiasing. It resembles nearest neighbor for enlargement,
+   and bilinear for reduction.
+
+   BILINEAR is bilinear interpolation. For enlargement, it is
+   equivalent to point-sampling the ideal bilinear-interpolated
+   image. For reduction, it is equivalent to laying down small tiles
+   and integrating over the coverage area.
+
+   HYPER is the highest quality reconstruction function. It is derived
+   from the hyperbolic filters in Wolberg's "Digital Image Warping,"
+   and is formally defined as the hyperbolic-filter sampling the ideal
+   hyperbolic-filter interpolated image (the filter is designed to be
+   idempotent for 1:1 pixel mapping). It is the slowest and highest
+   quality.
+
+   Note: at this stage of implementation, most filter modes are likely
+   not to be implemented.
+
+   Note: cubic filtering is missing from this list, because there isn't
+   much point - hyper is just as fast to implement and slightly better
+   in quality.
+
+*/
+
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_PATHCODE_H__ */

art_gray_svp.c

@@ -0,0 +1,123 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* Render a sorted vector path into a graymap. */
+
+#include "config.h"
+#include "art_gray_svp.h"
+
+#include <string.h>	/* for memset */
+#include "art_misc.h"
+
+#include "art_svp.h"
+#include "art_svp_render_aa.h"
+
+typedef struct _ArtGraySVPData ArtGraySVPData;
+
+struct _ArtGraySVPData {
+  art_u8 *buf;
+  int rowstride;
+  int x0, x1;
+};
+
+static void
+art_gray_svp_callback (void *callback_data, int y,
+		       int start, ArtSVPRenderAAStep *steps, int n_steps)
+{
+  ArtGraySVPData *data = (ArtGraySVPData *)callback_data;
+  art_u8 *linebuf;
+  int run_x0, run_x1;
+  int running_sum = start;
+  int x0, x1;
+  int k;
+
+#if 0
+  printf ("start = %d", start);
+  running_sum = start;
+  for (k = 0; k < n_steps; k++)
+    {
+      running_sum += steps[k].delta;
+      printf (" %d:%d", steps[k].x, running_sum >> 16);
+    }
+  printf ("\n");
+#endif
+
+  linebuf = data->buf;
+  x0 = data->x0;
+  x1 = data->x1;
+
+  if (n_steps > 0)
+    {
+      run_x1 = steps[0].x;
+      if (run_x1 > x0)
+	memset (linebuf, running_sum >> 16, run_x1 - x0);
+
+      for (k = 0; k < n_steps - 1; k++)
+	{
+	  running_sum += steps[k].delta;
+	  run_x0 = run_x1;
+	  run_x1 = steps[k + 1].x;
+	  if (run_x1 > run_x0)
+	    memset (linebuf + run_x0 - x0, running_sum >> 16, run_x1 - run_x0);
+	}
+      running_sum += steps[k].delta;
+      if (x1 > run_x1)
+	memset (linebuf + run_x1 - x0, running_sum >> 16, x1 - run_x1);
+    }
+  else
+    {
+      memset (linebuf, running_sum >> 16, x1 - x0);
+    }
+
+  data->buf += data->rowstride;
+}
+
+/**
+ * art_gray_svp_aa: Render the vector path into the bytemap.
+ * @svp: The SVP to render.
+ * @x0: The view window's left coord.
+ * @y0: The view window's top coord.
+ * @x1: The view window's right coord.
+ * @y1: The view window's bottom coord.
+ * @buf: The buffer where the bytemap is stored.
+ * @rowstride: the rowstride for @buf.
+ *
+ * Each pixel gets a value proportional to the area within the pixel
+ * overlapping the (filled) SVP. Pixel (x, y) is stored at:
+ *
+ *    @buf[(y - * @y0) * @rowstride + (x - @x0)]
+ *
+ * All pixels @x0 <= x < @x1, @y0 <= y < @y1 are generated. A
+ * stored value of zero is no coverage, and a value of 255 is full
+ * coverage. The area within the pixel (x, y) is the region covered
+ * by [x..x+1] and [y..y+1].
+ **/
+void
+art_gray_svp_aa (const ArtSVP *svp,
+		 int x0, int y0, int x1, int y1,
+		 art_u8 *buf, int rowstride)
+{
+  ArtGraySVPData data;
+
+  data.buf = buf;
+  data.rowstride = rowstride;
+  data.x0 = x0;
+  data.x1 = x1;
+  art_svp_render_aa (svp, x0, y0, x1, y1, art_gray_svp_callback, &data);
+}

art_gray_svp.h

@@ -0,0 +1,46 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* Render a sorted vector path into a graymap. */
+
+#ifndef __ART_GRAY_SVP_H__
+#define __ART_GRAY_SVP_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_misc.h"
+#include "art_svp.h"
+#else
+#include <libart_lgpl/art_misc.h>
+#include <libart_lgpl/art_svp.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+void
+art_gray_svp_aa (const ArtSVP *svp,
+		 int x0, int y0, int x1, int y1,
+		 art_u8 *buf, int rowstride);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_GRAY_SVP_H__ */

art_misc.c

@@ -0,0 +1,93 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* Various utility functions RLL finds useful. */
+
+#include "config.h"
+#include "art_misc.h"
+
+#ifdef HAVE_UINSTD_H
+#include <unistd.h>
+#endif
+#include <stdio.h>
+#include <stdarg.h>
+
+/**
+ * art_die: Print the error message to stderr and exit with a return code of 1.
+ * @fmt: The printf-style format for the error message.
+ *
+ * Used for dealing with severe errors.
+ **/
+void
+art_die (const char *fmt, ...)
+{
+  va_list ap;
+
+  va_start (ap, fmt);
+  vfprintf (stderr, fmt, ap);
+  va_end (ap);
+  exit (1);
+}
+
+/**
+ * art_warn: Print the warning message to stderr.
+ * @fmt: The printf-style format for the warning message.
+ *
+ * Used for generating warnings.
+ **/
+void
+art_warn (const char *fmt, ...)
+{
+  va_list ap;
+
+  va_start (ap, fmt);
+  vfprintf (stderr, fmt, ap);
+  va_end (ap);
+}
+
+/**
+ * art_dprint: Print the debug message to stderr.
+ * @fmt: The printf-style format for the debug message.
+ *
+ * Used for generating debug output.
+ **/
+void
+art_dprint (const char *fmt, ...)
+{
+  va_list ap;
+
+  va_start (ap, fmt);
+  vfprintf (stderr, fmt, ap);
+  va_end (ap);
+}
+
+void *art_alloc(size_t size)
+{
+  return malloc(size);
+}
+
+void art_free(void *ptr)
+{
+  free(ptr);
+}
+
+void *art_realloc(void *ptr, size_t size)
+{
+  return realloc(ptr, size);
+}

art_misc.h

@@ -0,0 +1,102 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* Simple macros to set up storage allocation and basic types for libart
+   functions. */
+
+#ifndef __ART_MISC_H__
+#define __ART_MISC_H__
+
+#include <stdlib.h> /* for malloc, etc. */
+
+/* The art_config.h file is automatically generated by
+   gen_art_config.c and contains definitions of
+   ART_SIZEOF_{CHAR,SHORT,INT,LONG} and art_u{8,16,32}. */
+#ifdef LIBART_COMPILATION
+#include "art_config.h"
+#else
+#include <libart_lgpl/art_config.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+void *art_alloc(size_t size);
+void art_free(void *ptr);
+void *art_realloc(void *ptr, size_t size);
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+/* These aren't, strictly speaking, configuration macros, but they're
+   damn handy to have around, and may be worth playing with for
+   debugging. */
+#define art_new(type, n) ((type *)art_alloc ((n) * sizeof(type)))
+
+#define art_renew(p, type, n) ((type *)art_realloc (p, (n) * sizeof(type)))
+
+/* This one must be used carefully - in particular, p and max should
+   be variables. They can also be pstruct->el lvalues. */
+#define art_expand(p, type, max) do { if(max) { p = art_renew (p, type, max <<= 1); } else { max = 1; p = art_new(type, 1); } } while (0)
+
+typedef int art_boolean;
+#define ART_FALSE 0
+#define ART_TRUE 1
+
+/* define pi */
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif  /*  M_PI  */
+
+#ifndef M_SQRT2
+#define M_SQRT2         1.41421356237309504880  /* sqrt(2) */
+#endif  /* M_SQRT2 */
+
+/* Provide macros to feature the GCC function attribute.
+ */
+#if defined(__GNUC__) && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4))
+#define ART_GNUC_PRINTF( format_idx, arg_idx )    \
+  __attribute__((__format__ (__printf__, format_idx, arg_idx)))
+#define ART_GNUC_NORETURN                         \
+  __attribute__((__noreturn__))
+#else   /* !__GNUC__ */
+#define ART_GNUC_PRINTF( format_idx, arg_idx )
+#define ART_GNUC_NORETURN
+#endif  /* !__GNUC__ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void ART_GNUC_NORETURN
+art_die (const char *fmt, ...) ART_GNUC_PRINTF (1, 2);
+
+void
+art_warn (const char *fmt, ...) ART_GNUC_PRINTF (1, 2);
+
+void
+art_dprint (const char *fmt, ...) ART_GNUC_PRINTF (1, 2);
+
+#ifdef __cplusplus
+}
+#endif
+
+#define ART_USE_NEW_INTERSECTOR
+
+#endif /* __ART_MISC_H__ */

art_pathcode.h

@@ -0,0 +1,39 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_PATHCODE_H__
+#define __ART_PATHCODE_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef enum {
+  ART_MOVETO,
+  ART_MOVETO_OPEN,
+  ART_CURVETO,
+  ART_LINETO,
+  ART_END
+} ArtPathcode;
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_PATHCODE_H__ */

art_pixbuf.c

@@ -0,0 +1,285 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_pixbuf.h"
+
+#include "art_misc.h"
+#include <string.h>
+
+/**
+ * art_pixbuf_new_rgb_dnotify: Create a new RGB #ArtPixBuf with explicit destroy notification.
+ * @pixels: A buffer containing the actual pixel data.
+ * @width: The width of the pixbuf.
+ * @height: The height of the pixbuf.
+ * @rowstride: The rowstride of the pixbuf.
+ * @dfunc_data: The private data passed to @dfunc.
+ * @dfunc: The destroy notification function.
+ *
+ * Creates a generic data structure for holding a buffer of RGB
+ * pixels.  It is possible to think of an #ArtPixBuf as a
+ * virtualization over specific pixel buffer formats.
+ *
+ * @dfunc is called with @dfunc_data and @pixels as arguments when the
+ * #ArtPixBuf is destroyed. Using a destroy notification function
+ * allows a wide range of memory management disciplines for the pixel
+ * memory. A NULL value for @dfunc is also allowed and means that no
+ * special action will be taken on destruction.
+ *
+ * Return value: The newly created #ArtPixBuf.
+ **/
+ArtPixBuf *
+art_pixbuf_new_rgb_dnotify (art_u8 *pixels, int width, int height, int rowstride,
+			    void *dfunc_data, ArtDestroyNotify dfunc)
+{
+  ArtPixBuf *pixbuf;
+
+  pixbuf = art_new (ArtPixBuf, 1);
+
+  pixbuf->format = ART_PIX_RGB;
+  pixbuf->n_channels = 3;
+  pixbuf->has_alpha = 0;
+  pixbuf->bits_per_sample = 8;
+
+  pixbuf->pixels = (art_u8 *) pixels;
+  pixbuf->width = width;
+  pixbuf->height = height;
+  pixbuf->rowstride = rowstride;
+  pixbuf->destroy_data = dfunc_data;
+  pixbuf->destroy = dfunc;
+
+  return pixbuf;
+}
+
+/**
+ * art_pixbuf_new_rgba_dnotify: Create a new RGBA #ArtPixBuf with explicit destroy notification.
+ * @pixels: A buffer containing the actual pixel data.
+ * @width: The width of the pixbuf.
+ * @height: The height of the pixbuf.
+ * @rowstride: The rowstride of the pixbuf.
+ * @dfunc_data: The private data passed to @dfunc.
+ * @dfunc: The destroy notification function.
+ *
+ * Creates a generic data structure for holding a buffer of RGBA
+ * pixels.  It is possible to think of an #ArtPixBuf as a
+ * virtualization over specific pixel buffer formats.
+ *
+ * @dfunc is called with @dfunc_data and @pixels as arguments when the
+ * #ArtPixBuf is destroyed. Using a destroy notification function
+ * allows a wide range of memory management disciplines for the pixel
+ * memory. A NULL value for @dfunc is also allowed and means that no
+ * special action will be taken on destruction.
+ *
+ * Return value: The newly created #ArtPixBuf.
+ **/
+ArtPixBuf *
+art_pixbuf_new_rgba_dnotify (art_u8 *pixels, int width, int height, int rowstride,
+			     void *dfunc_data, ArtDestroyNotify dfunc)
+{
+  ArtPixBuf *pixbuf;
+
+  pixbuf = art_new (ArtPixBuf, 1);
+
+  pixbuf->format = ART_PIX_RGB;
+  pixbuf->n_channels = 4;
+  pixbuf->has_alpha = 1;
+  pixbuf->bits_per_sample = 8;
+
+  pixbuf->pixels = (art_u8 *) pixels;
+  pixbuf->width = width;
+  pixbuf->height = height;
+  pixbuf->rowstride = rowstride;
+  pixbuf->destroy_data = dfunc_data;
+  pixbuf->destroy = dfunc;
+
+  return pixbuf;
+}
+
+/**
+ * art_pixbuf_new_const_rgb: Create a new RGB #ArtPixBuf with constant pixel data.
+ * @pixels: A buffer containing the actual pixel data.
+ * @width: The width of the pixbuf.
+ * @height: The height of the pixbuf.
+ * @rowstride: The rowstride of the pixbuf.
+ *
+ * Creates a generic data structure for holding a buffer of RGB
+ * pixels.  It is possible to think of an #ArtPixBuf as a
+ * virtualization over specific pixel buffer formats.
+ *
+ * No action is taken when the #ArtPixBuf is destroyed. Thus, this
+ * function is useful when the pixel data is constant or statically
+ * allocated.
+ *
+ * Return value: The newly created #ArtPixBuf.
+ **/
+ArtPixBuf *
+art_pixbuf_new_const_rgb (const art_u8 *pixels, int width, int height, int rowstride)
+{
+  return art_pixbuf_new_rgb_dnotify ((art_u8 *) pixels, width, height, rowstride, NULL, NULL);
+}
+
+/**
+ * art_pixbuf_new_const_rgba: Create a new RGBA #ArtPixBuf with constant pixel data.
+ * @pixels: A buffer containing the actual pixel data.
+ * @width: The width of the pixbuf.
+ * @height: The height of the pixbuf.
+ * @rowstride: The rowstride of the pixbuf.
+ *
+ * Creates a generic data structure for holding a buffer of RGBA
+ * pixels.  It is possible to think of an #ArtPixBuf as a
+ * virtualization over specific pixel buffer formats.
+ *
+ * No action is taken when the #ArtPixBuf is destroyed. Thus, this
+ * function is suitable when the pixel data is constant or statically
+ * allocated.
+ *
+ * Return value: The newly created #ArtPixBuf.
+ **/
+ArtPixBuf *
+art_pixbuf_new_const_rgba (const art_u8 *pixels, int width, int height, int rowstride)
+{
+  return art_pixbuf_new_rgba_dnotify ((art_u8 *) pixels, width, height, rowstride, NULL, NULL);
+}
+
+static void
+art_pixel_destroy (void *func_data, void *data)
+{
+  art_free (data);
+}
+
+/**
+ * art_pixbuf_new_rgb: Create a new RGB #ArtPixBuf.
+ * @pixels: A buffer containing the actual pixel data.
+ * @width: The width of the pixbuf.
+ * @height: The height of the pixbuf.
+ * @rowstride: The rowstride of the pixbuf.
+ *
+ * Creates a generic data structure for holding a buffer of RGB
+ * pixels.  It is possible to think of an #ArtPixBuf as a
+ * virtualization over specific pixel buffer formats.
+ *
+ * The @pixels buffer is freed with art_free() when the #ArtPixBuf is
+ * destroyed. Thus, this function is suitable when the pixel data is
+ * allocated with art_alloc().
+ *
+ * Return value: The newly created #ArtPixBuf.
+ **/
+ArtPixBuf *
+art_pixbuf_new_rgb (art_u8 *pixels, int width, int height, int rowstride)
+{
+  return art_pixbuf_new_rgb_dnotify (pixels, width, height, rowstride, NULL, art_pixel_destroy);
+}
+
+/**
+ * art_pixbuf_new_rgba: Create a new RGBA #ArtPixBuf.
+ * @pixels: A buffer containing the actual pixel data.
+ * @width: The width of the pixbuf.
+ * @height: The height of the pixbuf.
+ * @rowstride: The rowstride of the pixbuf.
+ *
+ * Creates a generic data structure for holding a buffer of RGBA
+ * pixels.  It is possible to think of an #ArtPixBuf as a
+ * virtualization over specific pixel buffer formats.
+ *
+ * The @pixels buffer is freed with art_free() when the #ArtPixBuf is
+ * destroyed. Thus, this function is suitable when the pixel data is
+ * allocated with art_alloc().
+ *
+ * Return value: The newly created #ArtPixBuf.
+ **/
+ArtPixBuf *
+art_pixbuf_new_rgba (art_u8 *pixels, int width, int height, int rowstride)
+{
+  return art_pixbuf_new_rgba_dnotify (pixels, width, height, rowstride, NULL, art_pixel_destroy);
+}
+
+/**
+ * art_pixbuf_free: Destroy an #ArtPixBuf.
+ * @pixbuf: The #ArtPixBuf to be destroyed.
+ *
+ * Destroys the #ArtPixBuf, calling the destroy notification function
+ * (if non-NULL) so that the memory for the pixel buffer can be
+ * properly reclaimed.
+ **/
+void
+art_pixbuf_free (ArtPixBuf *pixbuf)
+{
+  ArtDestroyNotify destroy = pixbuf->destroy;
+  void *destroy_data = pixbuf->destroy_data;
+  art_u8 *pixels = pixbuf->pixels;
+
+  pixbuf->pixels = NULL;
+  pixbuf->destroy = NULL;
+  pixbuf->destroy_data = NULL;
+
+  if (destroy)
+    destroy (destroy_data, pixels);
+
+  art_free (pixbuf);
+}
+
+/**
+ * art_pixbuf_free_shallow:
+ * @pixbuf: The #ArtPixBuf to be destroyed.
+ *
+ * Destroys the #ArtPixBuf without calling the destroy notification function.
+ *
+ * This function is deprecated. Use the _dnotify variants for
+ * allocation instead.
+ **/
+void
+art_pixbuf_free_shallow (ArtPixBuf *pixbuf)
+{
+  art_free (pixbuf);
+}
+
+/**
+ * art_pixbuf_duplicate: Duplicate a pixbuf.
+ * @pixbuf: The #ArtPixBuf to duplicate.
+ *
+ * Duplicates a pixbuf, including duplicating the buffer.
+ *
+ * Return value: The duplicated pixbuf.
+ **/
+ArtPixBuf *
+art_pixbuf_duplicate (const ArtPixBuf *pixbuf)
+{
+  ArtPixBuf *result;
+  int size;
+
+  result = art_new (ArtPixBuf, 1);
+
+  result->format = pixbuf->format;
+  result->n_channels = pixbuf->n_channels;
+  result->has_alpha = pixbuf->has_alpha;
+  result->bits_per_sample = pixbuf->bits_per_sample;
+
+  size = (pixbuf->height - 1) * pixbuf->rowstride +
+    pixbuf->width * ((pixbuf->n_channels * pixbuf->bits_per_sample + 7) >> 3);
+  result->pixels = art_alloc (size);
+  memcpy (result->pixels, pixbuf->pixels, size);
+
+  result->width = pixbuf->width;
+  result->height = pixbuf->height;
+  result->rowstride = pixbuf->rowstride;
+  result->destroy_data = NULL;
+  result->destroy = art_pixel_destroy;
+
+  return result;
+}

art_pixbuf.h

@@ -0,0 +1,104 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_PIXBUF_H__
+#define __ART_PIXBUF_H__
+
+/* A generic data structure for holding a buffer of pixels. One way
+   to think about this module is as a virtualization over specific
+   pixel buffer formats. */
+
+#ifdef LIBART_COMPILATION
+#include "art_misc.h"
+#else
+#include <libart_lgpl/art_misc.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+typedef void (*ArtDestroyNotify) (void *func_data, void *data);
+
+typedef struct _ArtPixBuf ArtPixBuf;
+
+typedef enum {
+  ART_PIX_RGB
+  /* gray, cmyk, lab, ... ? */
+} ArtPixFormat;
+
+
+/* The pixel buffer consists of width * height pixels, each of which
+   has n_channels samples. It is stored in simple packed format. */
+
+struct _ArtPixBuf {
+  /*< public >*/
+  ArtPixFormat format;
+  int n_channels;
+  int has_alpha;
+  int bits_per_sample;
+
+  art_u8 *pixels;
+  int width;
+  int height;
+  int rowstride;
+  void *destroy_data;
+  ArtDestroyNotify destroy;
+};
+
+/* allocate an ArtPixBuf from art_alloc()ed pixels (automated destruction) */
+ArtPixBuf *
+art_pixbuf_new_rgb (art_u8 *pixels, int width, int height, int rowstride);
+
+ArtPixBuf *
+art_pixbuf_new_rgba (art_u8 *pixels, int width, int height, int rowstride);
+
+/* allocate an ArtPixBuf from constant pixels (no destruction) */
+ArtPixBuf *
+art_pixbuf_new_const_rgb (const art_u8 *pixels, int width, int height, int rowstride);
+
+ArtPixBuf *
+art_pixbuf_new_const_rgba (const art_u8 *pixels, int width, int height, int rowstride);
+
+/* allocate an ArtPixBuf and notify creator upon destruction */
+ArtPixBuf *
+art_pixbuf_new_rgb_dnotify (art_u8 *pixels, int width, int height, int rowstride,
+			    void *dfunc_data, ArtDestroyNotify dfunc);
+
+ArtPixBuf *
+art_pixbuf_new_rgba_dnotify (art_u8 *pixels, int width, int height, int rowstride,
+			     void *dfunc_data, ArtDestroyNotify dfunc);
+
+/* free an ArtPixBuf with destroy notification */
+void
+art_pixbuf_free (ArtPixBuf *pixbuf);
+
+/* deprecated function, use the _dnotify variants for allocation instead */
+void
+art_pixbuf_free_shallow (ArtPixBuf *pixbuf);
+
+ArtPixBuf *
+art_pixbuf_duplicate (const ArtPixBuf *pixbuf);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

art_point.h

@@ -0,0 +1,38 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_POINT_H__
+#define __ART_POINT_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef struct _ArtPoint ArtPoint;
+
+struct _ArtPoint {
+  /*< public >*/
+  double x, y;
+};
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_POINT_H__ */

art_rect.c

@@ -0,0 +1,215 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_rect.h"
+
+#include <math.h>
+
+#ifndef MAX
+#define MAX(a, b)  (((a) > (b)) ? (a) : (b))
+#endif /* MAX */
+
+#ifndef MIN
+#define MIN(a, b)  (((a) < (b)) ? (a) : (b))
+#endif /* MIN */
+
+/* rectangle primitives stolen from gzilla */
+
+/**
+ * art_irect_copy: Make a copy of an integer rectangle.
+ * @dest: Where the copy is stored.
+ * @src: The source rectangle.
+ *
+ * Copies the rectangle.
+ **/
+void
+art_irect_copy (ArtIRect *dest, const ArtIRect *src) {
+  dest->x0 = src->x0;
+  dest->y0 = src->y0;
+  dest->x1 = src->x1;
+  dest->y1 = src->y1;
+}
+
+/**
+ * art_irect_union: Find union of two integer rectangles.
+ * @dest: Where the result is stored.
+ * @src1: A source rectangle.
+ * @src2: Another source rectangle.
+ *
+ * Finds the smallest rectangle that includes @src1 and @src2.
+ **/
+void
+art_irect_union (ArtIRect *dest, const ArtIRect *src1, const ArtIRect *src2) {
+  if (art_irect_empty (src1)) {
+    art_irect_copy (dest, src2);
+  } else if (art_irect_empty (src2)) {
+    art_irect_copy (dest, src1);
+  } else {
+    dest->x0 = MIN (src1->x0, src2->x0);
+    dest->y0 = MIN (src1->y0, src2->y0);
+    dest->x1 = MAX (src1->x1, src2->x1);
+    dest->y1 = MAX (src1->y1, src2->y1);
+  }
+}
+
+/**
+ * art_irect_intersection: Find intersection of two integer rectangles.
+ * @dest: Where the result is stored.
+ * @src1: A source rectangle.
+ * @src2: Another source rectangle.
+ *
+ * Finds the intersection of @src1 and @src2.
+ **/
+void
+art_irect_intersect (ArtIRect *dest, const ArtIRect *src1, const ArtIRect *src2) {
+  dest->x0 = MAX (src1->x0, src2->x0);
+  dest->y0 = MAX (src1->y0, src2->y0);
+  dest->x1 = MIN (src1->x1, src2->x1);
+  dest->y1 = MIN (src1->y1, src2->y1);
+}
+
+/**
+ * art_irect_empty: Determine whether integer rectangle is empty.
+ * @src: The source rectangle.
+ *
+ * Return value: TRUE if @src is an empty rectangle, FALSE otherwise.
+ **/
+int
+art_irect_empty (const ArtIRect *src) {
+  return (src->x1 <= src->x0 || src->y1 <= src->y0);
+}
+
+#if 0
+gboolean irect_point_inside (ArtIRect *rect, GzwPoint *point) {
+  return (point->x >= rect->x0 && point->y >= rect->y0 &&
+	  point->x < rect->x1 && point->y < rect->y1);
+}
+#endif
+
+/**
+ * art_drect_copy: Make a copy of a rectangle.
+ * @dest: Where the copy is stored.
+ * @src: The source rectangle.
+ *
+ * Copies the rectangle.
+ **/
+void
+art_drect_copy (ArtDRect *dest, const ArtDRect *src) {
+  dest->x0 = src->x0;
+  dest->y0 = src->y0;
+  dest->x1 = src->x1;
+  dest->y1 = src->y1;
+}
+
+/**
+ * art_drect_union: Find union of two rectangles.
+ * @dest: Where the result is stored.
+ * @src1: A source rectangle.
+ * @src2: Another source rectangle.
+ *
+ * Finds the smallest rectangle that includes @src1 and @src2.
+ **/
+void
+art_drect_union (ArtDRect *dest, const ArtDRect *src1, const ArtDRect *src2) {
+  if (art_drect_empty (src1)) {
+    art_drect_copy (dest, src2);
+  } else if (art_drect_empty (src2)) {
+    art_drect_copy (dest, src1);
+  } else {
+    dest->x0 = MIN (src1->x0, src2->x0);
+    dest->y0 = MIN (src1->y0, src2->y0);
+    dest->x1 = MAX (src1->x1, src2->x1);
+    dest->y1 = MAX (src1->y1, src2->y1);
+  }
+}
+
+/**
+ * art_drect_intersection: Find intersection of two rectangles.
+ * @dest: Where the result is stored.
+ * @src1: A source rectangle.
+ * @src2: Another source rectangle.
+ *
+ * Finds the intersection of @src1 and @src2.
+ **/
+void
+art_drect_intersect (ArtDRect *dest, const ArtDRect *src1, const ArtDRect *src2) {
+  dest->x0 = MAX (src1->x0, src2->x0);
+  dest->y0 = MAX (src1->y0, src2->y0);
+  dest->x1 = MIN (src1->x1, src2->x1);
+  dest->y1 = MIN (src1->y1, src2->y1);
+}
+
+/**
+ * art_irect_empty: Determine whether rectangle is empty.
+ * @src: The source rectangle.
+ *
+ * Return value: TRUE if @src is an empty rectangle, FALSE otherwise.
+ **/
+int
+art_drect_empty (const ArtDRect *src) {
+  return (src->x1 <= src->x0 || src->y1 <= src->y0);
+}
+
+/**
+ * art_drect_affine_transform: Affine transform rectangle.
+ * @dst: Where to store the result.
+ * @src: The source rectangle.
+ * @matrix: The affine transformation.
+ *
+ * Find the smallest rectangle enclosing the affine transformed @src.
+ * The result is exactly the affine transformation of @src when
+ * @matrix specifies a rectilinear affine transformation, otherwise it
+ * is a conservative approximation.
+ **/
+void
+art_drect_affine_transform (ArtDRect *dst, const ArtDRect *src, const double matrix[6])
+{
+  double x00, y00, x10, y10;
+  double x01, y01, x11, y11;
+
+  x00 = src->x0 * matrix[0] + src->y0 * matrix[2] + matrix[4];
+  y00 = src->x0 * matrix[1] + src->y0 * matrix[3] + matrix[5];
+  x10 = src->x1 * matrix[0] + src->y0 * matrix[2] + matrix[4];
+  y10 = src->x1 * matrix[1] + src->y0 * matrix[3] + matrix[5];
+  x01 = src->x0 * matrix[0] + src->y1 * matrix[2] + matrix[4];
+  y01 = src->x0 * matrix[1] + src->y1 * matrix[3] + matrix[5];
+  x11 = src->x1 * matrix[0] + src->y1 * matrix[2] + matrix[4];
+  y11 = src->x1 * matrix[1] + src->y1 * matrix[3] + matrix[5];
+  dst->x0 = MIN (MIN (x00, x10), MIN (x01, x11));
+  dst->y0 = MIN (MIN (y00, y10), MIN (y01, y11));
+  dst->x1 = MAX (MAX (x00, x10), MAX (x01, x11));
+  dst->y1 = MAX (MAX (y00, y10), MAX (y01, y11));
+}
+
+/**
+ * art_drect_to_irect: Convert rectangle to integer rectangle.
+ * @dst: Where to store resulting integer rectangle.
+ * @src: The source rectangle.
+ *
+ * Find the smallest integer rectangle that encloses @src.
+ **/
+void
+art_drect_to_irect (ArtIRect *dst, ArtDRect *src)
+{
+  dst->x0 = floor (src->x0);
+  dst->y0 = floor (src->y0);
+  dst->x1 = ceil (src->x1);
+  dst->y1 = ceil (src->y1);
+}

art_rect.h

@@ -0,0 +1,78 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_RECT_H__
+#define __ART_RECT_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct _ArtDRect ArtDRect;
+typedef struct _ArtIRect ArtIRect;
+
+struct _ArtDRect {
+  /*< public >*/
+  double x0, y0, x1, y1;
+};
+
+struct _ArtIRect {
+  /*< public >*/
+  int x0, y0, x1, y1;
+};
+
+/* Make a copy of the rectangle. */
+void art_irect_copy (ArtIRect *dest, const ArtIRect *src);
+
+/* Find the smallest rectangle that includes both source rectangles. */
+void art_irect_union (ArtIRect *dest,
+		      const ArtIRect *src1, const ArtIRect *src2);
+
+/* Return the intersection of the two rectangles */
+void art_irect_intersect (ArtIRect *dest,
+			  const ArtIRect *src1, const ArtIRect *src2);
+
+/* Return true if the rectangle is empty. */
+int art_irect_empty (const ArtIRect *src);
+
+/* Make a copy of the rectangle. */
+void art_drect_copy (ArtDRect *dest, const ArtDRect *src);
+
+/* Find the smallest rectangle that includes both source rectangles. */
+void art_drect_union (ArtDRect *dest,
+		      const ArtDRect *src1, const ArtDRect *src2);
+
+/* Return the intersection of the two rectangles */
+void art_drect_intersect (ArtDRect *dest,
+			  const ArtDRect *src1, const ArtDRect *src2);
+
+/* Return true if the rectangle is empty. */
+int art_drect_empty (const ArtDRect *src);
+
+void
+art_drect_affine_transform (ArtDRect *dst, const ArtDRect *src,
+			   const double matrix[6]);
+
+void art_drect_to_irect (ArtIRect *dst, ArtDRect *src);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

art_rect_svp.c

@@ -0,0 +1,82 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_rect_svp.h"
+
+#include "art_misc.h"
+#include "art_svp.h"
+#include "art_rect.h"
+
+#ifndef MAX
+#define MAX(a, b)  (((a) > (b)) ? (a) : (b))
+#endif /* MAX */
+
+#ifndef MIN
+#define MIN(a, b)  (((a) < (b)) ? (a) : (b))
+#endif /* MIN */
+
+/**
+ * art_drect_svp: Find the bounding box of a sorted vector path.
+ * @bbox: Where to store the bounding box.
+ * @svp: The SVP.
+ *
+ * Finds the bounding box of the SVP.
+ **/
+void
+art_drect_svp (ArtDRect *bbox, const ArtSVP *svp)
+{
+  int i;
+
+  if (svp->n_segs == 0)
+    {
+      bbox->x0 = 0;
+      bbox->y0 = 0;
+      bbox->x1 = 0;
+      bbox->y1 = 0;
+      return;
+    }
+
+  art_drect_copy (bbox, &svp->segs[0].bbox);
+  
+  for (i = 1; i < svp->n_segs; i++)
+    {
+      bbox->x0 = MIN (bbox->x0, svp->segs[i].bbox.x0);
+      bbox->y0 = MIN (bbox->y0, svp->segs[i].bbox.y0);
+      bbox->x1 = MAX (bbox->x1, svp->segs[i].bbox.x1);
+      bbox->y1 = MAX (bbox->y1, svp->segs[i].bbox.y1);
+    }
+}
+
+/**
+ * art_drect_svp_union: Compute the bounding box of the svp and union it in to the existing bounding box.
+ * @bbox: Initial boundin box and where to store the bounding box.
+ * @svp: The SVP.
+ *
+ * Finds the bounding box of the SVP, computing its union with an
+ * existing bbox.
+ **/
+void
+art_drect_svp_union (ArtDRect *bbox, const ArtSVP *svp)
+{
+  ArtDRect svp_bbox;
+
+  art_drect_svp (&svp_bbox, svp);
+  art_drect_union (bbox, bbox, &svp_bbox);
+}

art_rect_svp.h

@@ -0,0 +1,47 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_RECT_SVP_H__
+#define __ART_RECT_SVP_H__
+
+/* Find the bounding box of a sorted vector path. */
+
+#ifdef LIBART_COMPILATION
+#include "art_svp.h"
+#else
+#include <libart_lgpl/art_svp.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+void
+art_drect_svp (ArtDRect *bbox, const ArtSVP *svp);
+
+/* Compute the bounding box of the svp and union it in to the
+   existing bounding box. */
+void
+art_drect_svp_union (ArtDRect *bbox, const ArtSVP *svp);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_RECT_SVP_H__ */

art_rect_uta.c

@@ -0,0 +1,134 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_rect_uta.h"
+
+/* Functions to decompose a microtile array into a list of rectangles. */
+
+/**
+ * art_rect_list_from_uta: Decompose uta into list of rectangles.
+ * @uta: The source uta.
+ * @max_width: The maximum width of the resulting rectangles.
+ * @max_height: The maximum height of the resulting rectangles.
+ * @p_nrects: Where to store the number of returned rectangles.
+ *
+ * Allocates a new list of rectangles, sets *@p_nrects to the number
+ * in the list. This list should be freed with art_free().
+ *
+ * Each rectangle bounded in size by (@max_width, @max_height).
+ * However, these bounds must be at least the size of one tile.
+ *
+ * This routine provides a precise implementation, i.e. the rectangles
+ * cover exactly the same area as the uta. It is thus appropriate in
+ * cases where the overhead per rectangle is small compared with the
+ * cost of filling in extra pixels.
+ *
+ * Return value: An array containing the resulting rectangles.
+ **/
+ArtIRect *
+art_rect_list_from_uta (ArtUta *uta, int max_width, int max_height,
+			int *p_nrects)
+{
+  ArtIRect *rects;
+  int n_rects, n_rects_max;
+  int x, y;
+  int width, height;
+  int ix;
+  int left_ix;
+  ArtUtaBbox *utiles;
+  ArtUtaBbox bb;
+  int x0, y0, x1, y1;
+  int *glom;
+  int glom_rect;
+
+  n_rects = 0;
+  n_rects_max = 1;
+  rects = art_new (ArtIRect, n_rects_max);
+
+  width = uta->width;
+  height = uta->height;
+  utiles = uta->utiles;
+
+  glom = art_new (int, width * height);
+  for (ix = 0; ix < width * height; ix++)
+    glom[ix] = -1;
+
+  ix = 0;
+  for (y = 0; y < height; y++)
+    for (x = 0; x < width; x++)
+      {
+	bb = utiles[ix];
+	if (bb)
+	  {
+	    x0 = ((uta->x0 + x) << ART_UTILE_SHIFT) + ART_UTA_BBOX_X0(bb);
+	    y0 = ((uta->y0 + y) << ART_UTILE_SHIFT) + ART_UTA_BBOX_Y0(bb);
+	    y1 = ((uta->y0 + y) << ART_UTILE_SHIFT) + ART_UTA_BBOX_Y1(bb);
+
+	    left_ix = ix;
+	    /* now try to extend to the right */
+	    while (x != width - 1 &&
+		   ART_UTA_BBOX_X1(bb) == ART_UTILE_SIZE &&
+		   (((bb & 0xffffff) ^ utiles[ix + 1]) & 0xffff00ff) == 0 &&
+		   (((uta->x0 + x + 1) << ART_UTILE_SHIFT) +
+		    ART_UTA_BBOX_X1(utiles[ix + 1]) -
+		    x0) <= max_width)
+	      {
+		bb = utiles[ix + 1];
+		ix++;
+		x++;
+	      }
+	    x1 = ((uta->x0 + x) << ART_UTILE_SHIFT) + ART_UTA_BBOX_X1(bb);
+
+
+	    /* if rectangle nonempty */
+	    if ((x1 ^ x0) | (y1 ^ y0))
+	      {
+		/* try to glom onto an existing rectangle */
+		glom_rect = glom[left_ix];
+		if (glom_rect != -1 &&
+		    x0 == rects[glom_rect].x0 &&
+		    x1 == rects[glom_rect].x1 &&
+		    y0 == rects[glom_rect].y1 &&
+		    y1 - rects[glom_rect].y0 <= max_height)
+		  {
+		    rects[glom_rect].y1 = y1;
+		  }
+		else
+		  {
+		    if (n_rects == n_rects_max)
+		      art_expand (rects, ArtIRect, n_rects_max);
+		    rects[n_rects].x0 = x0;
+		    rects[n_rects].y0 = y0;
+		    rects[n_rects].x1 = x1;
+		    rects[n_rects].y1 = y1;
+		    glom_rect = n_rects;
+		    n_rects++;
+		  }
+		if (y != height - 1)
+		  glom[left_ix + width] = glom_rect;
+	      }
+	  }
+	ix++;
+      }
+
+  art_free (glom);
+  *p_nrects = n_rects;
+  return rects;
+}

art_rect_uta.h

@@ -0,0 +1,43 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_RECT_UTA_H__
+#define __ART_RECT_UTA_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_rect.h"
+#include "art_uta.h"
+#else
+#include <libart_lgpl/art_rect.h>
+#include <libart_lgpl/art_uta.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+ArtIRect *
+art_rect_list_from_uta (ArtUta *uta, int max_width, int max_height,
+			int *p_nrects);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_RECT_UTA_H__ */

art_render.h

@@ -0,0 +1,183 @@
+/*
+ * art_render.h: Modular rendering architecture.
+ *
+ * Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_RENDER_H__
+#define __ART_RENDER_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_alphagamma.h"
+#else
+#include <libart_lgpl/art_alphagamma.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* Render object */
+
+#ifndef ART_MAX_DEPTH
+#define ART_MAX_DEPTH 16
+#endif
+
+#if ART_MAX_DEPTH == 16
+typedef art_u16 ArtPixMaxDepth;
+#define ART_PIX_MAX_FROM_8(x) ((x) | ((x) << 8))
+#define ART_PIX_8_FROM_MAX(x) (((x) + 0x80 - (((x) + 0x80) >> 8)) >> 8)
+#else
+#if ART_MAX_DEPTH == 8
+typedef art_u8 ArtPixMaxDepth;
+#define ART_PIX_MAX_FROM_8(x) (x)
+#define ART_PIX_8_FROM_MAX(x) (x)
+#else
+#error ART_MAX_DEPTH must be either 8 or 16
+#endif
+#endif
+
+#define ART_MAX_CHAN 16
+
+typedef struct _ArtRender ArtRender;
+typedef struct _ArtRenderCallback ArtRenderCallback;
+typedef struct _ArtRenderMaskRun ArtRenderMaskRun;
+typedef struct _ArtImageSource ArtImageSource;
+typedef struct _ArtMaskSource ArtMaskSource;
+
+typedef enum {
+  ART_ALPHA_NONE      = 0,
+  ART_ALPHA_SEPARATE  = 1,
+  ART_ALPHA_PREMUL    = 2
+} ArtAlphaType;
+
+typedef enum {
+  ART_COMPOSITE_NORMAL,
+  ART_COMPOSITE_MULTIPLY,
+  /* todo: more */
+  ART_COMPOSITE_CUSTOM
+} ArtCompositingMode;
+
+typedef enum {
+  ART_IMAGE_SOURCE_CAN_CLEAR = 1,
+  ART_IMAGE_SOURCE_CAN_COMPOSITE = 2
+} ArtImageSourceFlags;
+
+struct _ArtRenderMaskRun {
+  int x;
+  int alpha;
+};
+
+struct _ArtRenderCallback {
+  void (*render) (ArtRenderCallback *self, ArtRender *render,
+		  art_u8 *dest, int y);
+  void (*done) (ArtRenderCallback *self, ArtRender *render);
+};
+
+struct _ArtImageSource {
+  ArtRenderCallback super;
+  void (*negotiate) (ArtImageSource *self, ArtRender *render,
+		     ArtImageSourceFlags *p_flags,
+		     int *p_buf_depth, ArtAlphaType *p_alpha_type);
+};
+
+struct _ArtMaskSource {
+  ArtRenderCallback super;
+  int (*can_drive) (ArtMaskSource *self, ArtRender *render);
+  /* For each mask source, ::prepare() is invoked if it is not
+     a driver, or ::invoke_driver() if it is. */
+  void (*invoke_driver) (ArtMaskSource *self, ArtRender *render);
+  void (*prepare) (ArtMaskSource *self, ArtRender *render, art_boolean first);
+};
+
+struct _ArtRender {
+  /* parameters of destination image */
+  int x0, y0;
+  int x1, y1;
+  art_u8 *pixels;
+  int rowstride;
+  int n_chan;
+  int depth;
+  ArtAlphaType alpha_type;
+
+  art_boolean clear;
+  ArtPixMaxDepth clear_color[ART_MAX_CHAN + 1];
+  art_u32 opacity; /* [0..0x10000] */
+
+  ArtCompositingMode compositing_mode;
+
+  ArtAlphaGamma *alphagamma;
+
+  art_u8 *alpha_buf;
+
+  /* parameters of intermediate buffer */
+  int buf_depth;
+  ArtAlphaType buf_alpha;
+  art_u8 *image_buf;
+
+  /* driving alpha scanline data */
+  /* A "run" is a contiguous sequence of x values with the same alpha value. */
+  int n_run;
+  ArtRenderMaskRun *run;
+
+  /* A "span" is a contiguous sequence of x values with non-zero alpha. */
+  int n_span;
+  int *span_x;
+
+  art_boolean need_span;
+};
+
+ArtRender *
+art_render_new (int x0, int y0, int x1, int y1,
+		art_u8 *pixels, int rowstride,
+		int n_chan, int depth, ArtAlphaType alpha_type,
+		ArtAlphaGamma *alphagamma);
+
+void
+art_render_invoke (ArtRender *render);
+
+void
+art_render_clear (ArtRender *render, const ArtPixMaxDepth *clear_color);
+
+void
+art_render_clear_rgb (ArtRender *render, art_u32 clear_rgb);
+
+void
+art_render_mask_solid (ArtRender *render, int opacity);
+
+void
+art_render_image_solid (ArtRender *render, ArtPixMaxDepth *color);
+
+/* The next two functions are for custom mask sources only. */
+void
+art_render_add_mask_source (ArtRender *render, ArtMaskSource *mask_source);
+
+void
+art_render_invoke_callbacks (ArtRender *render, art_u8 *dest, int y);
+
+/* The following function is for custom image sources only. */
+void
+art_render_add_image_source (ArtRender *render, ArtImageSource *image_source);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_RENDER_H__ */
+

art_render_gradient.c

@@ -0,0 +1,716 @@
+/*
+ * art_render_gradient.c: Gradient image source for modular rendering.
+ *
+ * Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors: Raph Levien <raph@acm.org>
+ *          Alexander Larsson <alla@lysator.liu.se>
+ */
+
+#include "config.h"
+#include "art_render_gradient.h"
+
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+/* Hack to find out how to define alloca on different platforms.
+ * Modified version of glib/galloca.h.
+ */
+
+#ifdef  __GNUC__
+/* GCC does the right thing */
+# undef alloca
+# define alloca(size)   __builtin_alloca (size)
+#elif defined (HAVE_ALLOCA_H)
+/* a native and working alloca.h is there */ 
+# include <alloca.h>
+#else /* !__GNUC__ && !HAVE_ALLOCA_H */
+# ifdef _MSC_VER
+#  include <malloc.h>
+#  define alloca _alloca
+# else /* !_MSC_VER */
+#  ifdef _AIX
+ #pragma alloca
+#  else /* !_AIX */
+#   ifndef alloca /* predefined by HP cc +Olibcalls */
+char *alloca ();
+#   endif /* !alloca */
+#  endif /* !_AIX */
+# endif /* !_MSC_VER */
+#endif /* !__GNUC__ && !HAVE_ALLOCA_H */
+
+#undef DEBUG_SPEW
+
+typedef struct _ArtImageSourceGradLin ArtImageSourceGradLin;
+typedef struct _ArtImageSourceGradRad ArtImageSourceGradRad;
+
+/* The stops will be copied right after this structure */
+struct _ArtImageSourceGradLin {
+  ArtImageSource super;
+  ArtGradientLinear gradient;
+  ArtGradientStop stops[1];
+};
+
+/* The stops will be copied right after this structure */
+struct _ArtImageSourceGradRad {
+  ArtImageSource super;
+  ArtGradientRadial gradient;
+  double a;
+  ArtGradientStop stops[1];
+};
+
+#define EPSILON 1e-6
+
+#ifndef MAX
+#define MAX(a, b)  (((a) > (b)) ? (a) : (b))
+#endif /* MAX */
+
+#ifndef MIN
+#define MIN(a, b)  (((a) < (b)) ? (a) : (b))
+#endif /* MIN */
+
+static void
+art_rgba_gradient_run (art_u8 *buf,
+		       art_u8 *color1,
+		       art_u8 *color2,
+		       int len)
+{
+  int i;
+  int r, g, b, a;
+  int dr, dg, db, da;
+
+#ifdef DEBUG_SPEW
+  printf ("gradient run from %3d %3d %3d %3d to %3d %3d %3d %3d in %d pixels\n",
+	  color1[0], color1[1], color1[2], color1[3], 
+	  color2[0], color2[1], color2[2], color2[3],
+	  len);
+#endif
+  
+  r = (color1[0] << 16) + 0x8000;
+  g = (color1[1] << 16) + 0x8000;
+  b = (color1[2] << 16) + 0x8000;
+  a = (color1[3] << 16) + 0x8000;
+  dr = ((color2[0] - color1[0]) << 16) / len;
+  dg = ((color2[1] - color1[1]) << 16) / len;
+  db = ((color2[2] - color1[2]) << 16) / len;
+  da = ((color2[3] - color1[3]) << 16) / len;
+
+  for (i = 0; i < len; i++)
+    {
+      *buf++ = (r>>16);
+      *buf++ = (g>>16);
+      *buf++ = (b>>16);
+      *buf++ = (a>>16);
+
+      r += dr;
+      g += dg;
+      b += db;
+      a += da;
+    }
+}
+
+static void
+calc_color_at (ArtGradientStop *stops,
+	       int n_stops,
+	       ArtGradientSpread spread,
+	       double offset,
+	       double offset_fraction,
+	       int favor_start,
+	       int ix,
+	       art_u8 *color)
+{
+  double off0, off1;
+  int j;
+  
+  if (spread == ART_GRADIENT_PAD)
+    {
+      if (offset < 0.0)
+	{
+	  color[0] = ART_PIX_8_FROM_MAX (stops[0].color[0]);
+	  color[1] = ART_PIX_8_FROM_MAX (stops[0].color[1]);
+	  color[2] = ART_PIX_8_FROM_MAX (stops[0].color[2]);
+	  color[3] = ART_PIX_8_FROM_MAX (stops[0].color[3]);
+	  return;
+	}
+      if (offset >= 1.0)
+	{
+	  color[0] = ART_PIX_8_FROM_MAX (stops[n_stops-1].color[0]);
+	  color[1] = ART_PIX_8_FROM_MAX (stops[n_stops-1].color[1]);
+	  color[2] = ART_PIX_8_FROM_MAX (stops[n_stops-1].color[2]);
+	  color[3] = ART_PIX_8_FROM_MAX (stops[n_stops-1].color[3]);
+	  return;
+	}
+    }
+
+  if (ix > 0 && ix < n_stops)
+    {
+      off0 = stops[ix - 1].offset;
+      off1 = stops[ix].offset;
+      if (fabs (off1 - off0) > EPSILON)
+	{
+	  double interp;
+	  double o;
+	  o = offset_fraction;
+	  
+	  if ((fabs (o) < EPSILON) && (!favor_start))
+	    o = 1.0;
+	  else if ((fabs (o-1.0) < EPSILON) && (favor_start))
+	    o = 0.0;
+	  
+	  /*
+	  if (offset_fraction == 0.0  && !favor_start)
+	    offset_fraction = 1.0;
+	  */
+	  
+	  interp = (o - off0) / (off1 - off0);
+	  for (j = 0; j < 4; j++)
+	    {
+	      int z0, z1;
+	      int z;
+	      z0 = stops[ix - 1].color[j];
+	      z1 = stops[ix].color[j];
+	      z = floor (z0 + (z1 - z0) * interp + 0.5);
+	      color[j] = ART_PIX_8_FROM_MAX (z);
+	    }
+	  return;
+	}
+      /* If offsets are too close to safely do the division, just
+	 pick the ix color. */
+      color[0] = ART_PIX_8_FROM_MAX (stops[ix].color[0]);
+      color[1] = ART_PIX_8_FROM_MAX (stops[ix].color[1]);
+      color[2] = ART_PIX_8_FROM_MAX (stops[ix].color[2]);
+      color[3] = ART_PIX_8_FROM_MAX (stops[ix].color[3]);
+      return;
+    }
+
+  printf ("WARNING! bad ix %d in calc_color_at() [internal error]\n", ix);
+  assert (0);
+}
+
+static void
+art_render_gradient_linear_render_8 (ArtRenderCallback *self,
+				     ArtRender *render,
+				     art_u8 *dest, int y)
+{
+  ArtImageSourceGradLin *z = (ArtImageSourceGradLin *)self;
+  const ArtGradientLinear *gradient = &(z->gradient);
+  int i;
+  int width = render->x1 - render->x0;
+  int len;
+  double offset, d_offset;
+  double offset_fraction;
+  int next_stop;
+  int ix;
+  art_u8 color1[4], color2[4];
+  int n_stops = gradient->n_stops;
+  int extra_stops;
+  ArtGradientStop *stops = gradient->stops;
+  ArtGradientStop *tmp_stops;
+  art_u8 *bufp = render->image_buf;
+  ArtGradientSpread spread = gradient->spread;
+
+#ifdef DEBUG_SPEW
+  printf ("x1: %d, x2: %d, y: %d\n", render->x0, render->x1, y);
+  printf ("spread: %d, stops:", gradient->spread);
+  for (i=0;i<n_stops;i++)
+    {
+      printf ("%f, ", gradient->stops[i].offset);
+    }
+  printf ("\n");
+  printf ("a: %f, b: %f, c: %f\n", gradient->a, gradient->b, gradient->c);
+#endif
+  
+  offset = render->x0 * gradient->a + y * gradient->b + gradient->c;
+  d_offset = gradient->a;
+
+  /* We need to force the gradient to extend the whole 0..1 segment,
+     because the rest of the code doesn't handle partial gradients
+     correctly */
+  if ((gradient->stops[0].offset > EPSILON /* == 0.0 */) ||
+      (gradient->stops[n_stops-1].offset < (1.0 - EPSILON)))
+  {
+    extra_stops = 0;
+    tmp_stops = stops = alloca (sizeof (ArtGradientStop) * (n_stops + 2));
+    if (gradient->stops[0].offset > EPSILON /* 0.0 */)
+      {
+	memcpy (tmp_stops, gradient->stops, sizeof (ArtGradientStop));
+	tmp_stops[0].offset = 0.0;
+	tmp_stops += 1;
+	extra_stops++;
+      }
+    memcpy (tmp_stops, gradient->stops, sizeof (ArtGradientStop) * n_stops);
+    if (gradient->stops[n_stops-1].offset < (1.0 - EPSILON))
+      {
+	tmp_stops += n_stops;
+	memcpy (tmp_stops, &gradient->stops[n_stops-1], sizeof (ArtGradientStop));
+	tmp_stops[0].offset = 1.0;
+	extra_stops++;
+      }
+    n_stops += extra_stops;
+
+
+#ifdef DEBUG_SPEW
+    printf ("start/stop modified stops:");
+    for (i=0;i<n_stops;i++)
+      {
+	printf ("%f, ", stops[i].offset);
+      }
+    printf ("\n");
+#endif
+
+  }
+  
+  if (spread == ART_GRADIENT_REFLECT)
+    {
+      tmp_stops = stops;
+      stops = alloca (sizeof (ArtGradientStop) * n_stops * 2);
+      memcpy (stops, tmp_stops, sizeof (ArtGradientStop) * n_stops);
+
+      for (i = 0; i< n_stops; i++)
+	{
+	  stops[n_stops * 2 - 1 - i].offset = (1.0 - stops[i].offset / 2.0);
+	  memcpy (stops[n_stops * 2 - 1 - i].color, stops[i].color, sizeof (stops[i].color));
+	  stops[i].offset = stops[i].offset / 2.0;
+	}
+      
+      spread = ART_GRADIENT_REPEAT;
+      offset = offset / 2.0;
+      d_offset = d_offset / 2.0;
+      
+      n_stops = 2 * n_stops;
+
+#ifdef DEBUG_SPEW
+      printf ("reflect modified stops:");
+      for (i=0;i<n_stops;i++)
+	{
+	  printf ("%f, ", stops[i].offset);
+	}
+      printf ("\n");
+#endif
+    }
+
+  offset_fraction = offset - floor (offset);
+#ifdef DEBUG_SPEW
+  printf ("inital offset: %f, fraction: %f d_offset: %f\n", offset, offset_fraction, d_offset);
+#endif
+  /* ix is selected so that offset_fraction is
+     stops[ix-1] <= offset_fraction <= stops[ix]
+     If offset_fraction is equal to one of the edges, ix
+     is selected so the the section of the line extending
+     in the same direction as d_offset is between ix-1 and ix.
+  */
+  for (ix = 0; ix < n_stops; ix++)
+    if (stops[ix].offset > offset_fraction ||
+	(d_offset < 0.0 && fabs (stops[ix].offset - offset_fraction) < EPSILON))
+      break;
+  if (ix == 0)
+    ix = n_stops - 1;
+  else if (ix == n_stops)
+    ix = n_stops - 1;
+
+#ifdef DEBUG_SPEW
+  printf ("Initial ix: %d\n", ix);
+#endif
+  
+  assert (ix > 0);
+  assert (ix < n_stops);
+  assert ((stops[ix-1].offset <= offset_fraction + EPSILON) ||
+	  ((stops[ix].offset > (1.0 - EPSILON)) && (offset_fraction < EPSILON /* == 0.0*/)));
+  assert (offset_fraction <= stops[ix].offset);
+  /* FIXME: These asserts may be broken, it is for now
+     safer to not use them.  Should be fixed!
+     See bug #121850
+  assert ((offset_fraction != stops[ix-1].offset) ||
+	  (d_offset >= 0.0));
+  assert ((offset_fraction != stops[ix].offset) ||
+	  (d_offset <= 0.0));
+  */
+  
+  while (width > 0)
+    {
+#ifdef DEBUG_SPEW
+      printf ("ix: %d\n", ix);
+      printf ("start offset: %f\n", offset);
+#endif
+      calc_color_at (stops, n_stops,
+		     spread,
+		     offset,
+		     offset_fraction,
+		     (d_offset > -EPSILON),
+		     ix,
+		     color1);
+
+      if (d_offset > 0)
+	next_stop = ix;
+      else
+	next_stop = ix-1;
+
+#ifdef DEBUG_SPEW
+      printf ("next_stop: %d\n", next_stop);
+#endif
+      if (fabs (d_offset) > EPSILON)
+	{
+	  double o;
+	  o = offset_fraction;
+	  
+	  if ((fabs (o) <= EPSILON) && (ix == n_stops - 1))
+	    o = 1.0;
+	  else if ((fabs (o-1.0) <= EPSILON) && (ix == 1))
+	    o = 0.0;
+
+#ifdef DEBUG_SPEW
+	  printf ("o: %f\n", o);
+#endif
+	  len = (int)floor (fabs ((stops[next_stop].offset - o) / d_offset)) + 1;
+	  len = MAX (len, 0);
+	  len = MIN (len, width);
+	}
+      else
+	{
+	  len = width;
+	}
+#ifdef DEBUG_SPEW
+      printf ("len: %d\n", len);
+#endif
+      if (len > 0)
+	{
+	  offset = offset + (len-1) * d_offset;
+	  offset_fraction = offset - floor (offset);
+#ifdef DEBUG_SPEW
+	  printf ("end offset: %f, fraction: %f\n", offset, offset_fraction);
+#endif	  
+	  calc_color_at (stops, n_stops,
+			 spread,
+			 offset,
+			 offset_fraction,
+			 (d_offset < EPSILON),
+			 ix,
+			 color2);
+	  
+	  art_rgba_gradient_run (bufp,
+				 color1,
+				 color2,
+				 len);
+	  offset += d_offset;
+	  offset_fraction = offset - floor (offset);
+	}
+
+      if (d_offset > 0)
+	{
+	  do
+	    {
+	      ix++;
+	      if (ix == n_stops)
+		ix = 1;
+	      /* Note: offset_fraction can actually be one here on x86 machines that
+		 does calculations with extended precision, but later rounds to 64bit.
+		 This happens if the 80bit offset_fraction is larger than the
+		 largest 64bit double that is less than one.
+	      */
+	    }
+	  while (!((stops[ix-1].offset <= offset_fraction &&
+		   offset_fraction < stops[ix].offset) ||
+		   (ix == 1 && offset_fraction > (1.0 - EPSILON)))); 
+	}
+      else
+	{
+	  do
+	    {
+	      ix--;
+	      if (ix == 0)
+		ix = n_stops - 1;
+	    }
+	  while (!((stops[ix-1].offset < offset_fraction &&
+		    offset_fraction <= stops[ix].offset) ||
+		   (ix == n_stops - 1 && offset_fraction < EPSILON /* == 0.0*/)));
+	}
+      
+      bufp += 4*len;
+      width -= len;
+    }
+}
+
+
+/**
+ * art_render_gradient_setpix: Set a gradient pixel.
+ * @render: The render object.
+ * @dst: Pointer to destination (where to store pixel).
+ * @n_stops: Number of stops in @stops.
+ * @stops: The stops for the gradient.
+ * @offset: The offset.
+ *
+ * @n_stops must be > 0.
+ *
+ * Sets a gradient pixel, storing it at @dst.
+ **/
+static void
+art_render_gradient_setpix (ArtRender *render,
+			    art_u8 *dst,
+			    int n_stops, ArtGradientStop *stops,
+			    double offset)
+{
+  int ix;
+  int j;
+  double off0, off1;
+  int n_ch = render->n_chan + 1;
+
+  for (ix = 0; ix < n_stops; ix++)
+    if (stops[ix].offset > offset)
+      break;
+  /* stops[ix - 1].offset < offset < stops[ix].offset */
+  if (ix > 0 && ix < n_stops)
+    {
+      off0 = stops[ix - 1].offset;
+      off1 = stops[ix].offset;
+      if (fabs (off1 - off0) > EPSILON)
+	{
+	  double interp;
+
+	  interp = (offset - off0) / (off1 - off0);
+	  for (j = 0; j < n_ch; j++)
+	    {
+	      int z0, z1;
+	      int z;
+	      z0 = stops[ix - 1].color[j];
+	      z1 = stops[ix].color[j];
+	      z = floor (z0 + (z1 - z0) * interp + 0.5);
+	      if (render->buf_depth == 8)
+		dst[j] = ART_PIX_8_FROM_MAX (z);
+	      else /* (render->buf_depth == 16) */
+		((art_u16 *)dst)[j] = z;
+	    }
+	  return;
+	}
+    }
+  else if (ix == n_stops)
+    ix--;
+
+  for (j = 0; j < n_ch; j++)
+    {
+      int z;
+      z = stops[ix].color[j];
+      if (render->buf_depth == 8)
+	dst[j] = ART_PIX_8_FROM_MAX (z);
+      else /* (render->buf_depth == 16) */
+	((art_u16 *)dst)[j] = z;
+    }
+}
+
+static void
+art_render_gradient_linear_done (ArtRenderCallback *self, ArtRender *render)
+{
+  art_free (self);
+}
+
+static void
+art_render_gradient_linear_render (ArtRenderCallback *self, ArtRender *render,
+				   art_u8 *dest, int y)
+{
+  ArtImageSourceGradLin *z = (ArtImageSourceGradLin *)self;
+  const ArtGradientLinear *gradient = &(z->gradient);
+  int pixstride = (render->n_chan + 1) * (render->depth >> 3);
+  int x;
+  int width = render->x1 - render->x0;
+  double offset, d_offset;
+  double actual_offset;
+  int n_stops = gradient->n_stops;
+  ArtGradientStop *stops = gradient->stops;
+  art_u8 *bufp = render->image_buf;
+  ArtGradientSpread spread = gradient->spread;
+
+  offset = render->x0 * gradient->a + y * gradient->b + gradient->c;
+  d_offset = gradient->a;
+
+  for (x = 0; x < width; x++)
+    {
+      if (spread == ART_GRADIENT_PAD)
+	actual_offset = offset;
+      else if (spread == ART_GRADIENT_REPEAT)
+	actual_offset = offset - floor (offset);
+      else /* (spread == ART_GRADIENT_REFLECT) */
+	{
+	  double tmp;
+
+	  tmp = offset - 2 * floor (0.5 * offset);
+	  actual_offset = tmp > 1 ? 2 - tmp : tmp;
+	}
+      art_render_gradient_setpix (render, bufp, n_stops, stops, actual_offset);
+      offset += d_offset;
+      bufp += pixstride;
+    }
+}
+
+static void
+art_render_gradient_linear_negotiate (ArtImageSource *self, ArtRender *render,
+				      ArtImageSourceFlags *p_flags,
+				      int *p_buf_depth, ArtAlphaType *p_alpha)
+{
+  if (render->depth == 8 &&
+      render->n_chan == 3)
+    {
+      self->super.render = art_render_gradient_linear_render_8;
+      *p_flags = 0;
+      *p_buf_depth = 8;
+      *p_alpha = ART_ALPHA_PREMUL;
+      return;
+    }
+  
+  self->super.render = art_render_gradient_linear_render;
+  *p_flags = 0;
+  *p_buf_depth = render->depth;
+  *p_alpha = ART_ALPHA_PREMUL;
+}
+
+/**
+ * art_render_gradient_linear: Add a linear gradient image source.
+ * @render: The render object.
+ * @gradient: The linear gradient.
+ *
+ * Adds the linear gradient @gradient as the image source for rendering
+ * in the render object @render.
+ **/
+void
+art_render_gradient_linear (ArtRender *render,
+			    const ArtGradientLinear *gradient,
+			    ArtFilterLevel level)
+{
+  ArtImageSourceGradLin *image_source = art_alloc (sizeof (ArtImageSourceGradLin) +
+						   sizeof (ArtGradientStop) * (gradient->n_stops - 1));
+
+  image_source->super.super.render = NULL;
+  image_source->super.super.done = art_render_gradient_linear_done;
+  image_source->super.negotiate = art_render_gradient_linear_negotiate;
+
+  /* copy the gradient into the structure */
+  image_source->gradient = *gradient;
+  image_source->gradient.stops = image_source->stops;
+  memcpy (image_source->gradient.stops, gradient->stops, sizeof (ArtGradientStop) * gradient->n_stops);
+
+  art_render_add_image_source (render, &image_source->super);
+}
+
+static void
+art_render_gradient_radial_done (ArtRenderCallback *self, ArtRender *render)
+{
+  art_free (self);
+}
+
+static void
+art_render_gradient_radial_render (ArtRenderCallback *self, ArtRender *render,
+				   art_u8 *dest, int y)
+{
+  ArtImageSourceGradRad *z = (ArtImageSourceGradRad *)self;
+  const ArtGradientRadial *gradient = &(z->gradient);
+  int pixstride = (render->n_chan + 1) * (render->depth >> 3);
+  int x;
+  int x0 = render->x0;
+  int width = render->x1 - x0;
+  int n_stops = gradient->n_stops;
+  ArtGradientStop *stops = gradient->stops;
+  art_u8 *bufp = render->image_buf;
+  double fx = gradient->fx;
+  double fy = gradient->fy;
+  double dx, dy;
+  const double *affine = gradient->affine;
+  double aff0 = affine[0];
+  double aff1 = affine[1];
+  const double a = z->a;
+  const double arecip = 1.0 / a;
+  double b, db;
+  double c, dc, ddc;
+  double b_a, db_a;
+  double rad, drad, ddrad;
+
+  dx = x0 * aff0 + y * affine[2] + affine[4] - fx;
+  dy = x0 * aff1 + y * affine[3] + affine[5] - fy;
+  b = dx * fx + dy * fy;
+  db = aff0 * fx + aff1 * fy;
+  c = dx * dx + dy * dy;
+  dc = 2 * aff0 * dx + aff0 * aff0 + 2 * aff1 * dy + aff1 * aff1;
+  ddc = 2 * aff0 * aff0 + 2 * aff1 * aff1;
+
+  b_a = b * arecip;
+  db_a = db * arecip;
+
+  rad = b_a * b_a + c * arecip;
+  drad = 2 * b_a * db_a + db_a * db_a + dc * arecip;
+  ddrad = 2 * db_a * db_a + ddc * arecip;
+
+  for (x = 0; x < width; x++)
+    {
+      double z;
+
+      if (rad > 0)
+	z = b_a + sqrt (rad);
+      else
+	z = b_a;
+      art_render_gradient_setpix (render, bufp, n_stops, stops, z);
+      bufp += pixstride;
+      b_a += db_a;
+      rad += drad;
+      drad += ddrad;
+    }
+}
+
+static void
+art_render_gradient_radial_negotiate (ArtImageSource *self, ArtRender *render,
+				      ArtImageSourceFlags *p_flags,
+				      int *p_buf_depth, ArtAlphaType *p_alpha)
+{
+  self->super.render = art_render_gradient_radial_render;
+  *p_flags = 0;
+  *p_buf_depth = render->depth;
+  *p_alpha = ART_ALPHA_PREMUL;
+}
+
+/**
+ * art_render_gradient_radial: Add a radial gradient image source.
+ * @render: The render object.
+ * @gradient: The radial gradient.
+ *
+ * Adds the radial gradient @gradient as the image source for rendering
+ * in the render object @render.
+ **/
+void
+art_render_gradient_radial (ArtRender *render,
+			    const ArtGradientRadial *gradient,
+			    ArtFilterLevel level)
+{
+  ArtImageSourceGradRad *image_source = art_alloc (sizeof (ArtImageSourceGradRad) +
+						   sizeof (ArtGradientStop) * (gradient->n_stops - 1));
+  double fx = gradient->fx;
+  double fy = gradient->fy;
+
+  image_source->super.super.render = NULL;
+  image_source->super.super.done = art_render_gradient_radial_done;
+  image_source->super.negotiate = art_render_gradient_radial_negotiate;
+
+  /* copy the gradient into the structure */
+  image_source->gradient = *gradient;
+  image_source->gradient.stops = image_source->stops;
+  memcpy (image_source->gradient.stops, gradient->stops, sizeof (ArtGradientStop) * gradient->n_stops);
+
+  /* todo: sanitycheck fx, fy? */
+  image_source->a = 1 - fx * fx - fy * fy;
+
+  art_render_add_image_source (render, &image_source->super);
+}

art_render_gradient.h

@@ -0,0 +1,86 @@
+/*
+ * art_render_gradient.h: Gradient image source for modular rendering.
+ *
+ * Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors: Raph Levien <raph@acm.org>
+ *          Alexander Larsson <alla@lysator.liu.se>
+ */
+
+#ifndef __ART_RENDER_GRADIENT_H__
+#define __ART_RENDER_GRADIENT_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_filterlevel.h"
+#include "art_render.h"
+#else
+#include <libart_lgpl/art_filterlevel.h>
+#include <libart_lgpl/art_render.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef struct _ArtGradientLinear ArtGradientLinear;
+typedef struct _ArtGradientRadial ArtGradientRadial;
+typedef struct _ArtGradientStop ArtGradientStop;
+
+typedef enum {
+  ART_GRADIENT_PAD,
+  ART_GRADIENT_REFLECT,
+  ART_GRADIENT_REPEAT
+} ArtGradientSpread;
+
+struct _ArtGradientLinear {
+  double a;
+  double b;
+  double c;
+  ArtGradientSpread spread;
+  int n_stops;
+  ArtGradientStop *stops;
+};
+
+struct _ArtGradientRadial {
+  double affine[6]; /* transforms user coordinates to unit circle */
+  double fx, fy;    /* focal point in unit circle coords */
+  int n_stops;
+  ArtGradientStop *stops;
+};
+
+struct _ArtGradientStop {
+  double offset;
+  ArtPixMaxDepth color[ART_MAX_CHAN + 1];
+};
+
+void
+art_render_gradient_linear (ArtRender *render,
+			    const ArtGradientLinear *gradient,
+			    ArtFilterLevel level);
+
+void
+art_render_gradient_radial (ArtRender *render,
+			    const ArtGradientRadial *gradient,
+			    ArtFilterLevel level);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_RENDER_GRADIENT_H__ */

art_render_mask.c

@@ -0,0 +1,168 @@
+/*
+ * art_render_mask.c: Alpha mask source for modular rendering.
+ *
+ * Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors: Raph Levien <raph@acm.org>
+ */
+
+#include "config.h"
+#include "art_render_mask.h"
+
+#include <string.h>
+
+
+typedef struct _ArtMaskSourceMask ArtMaskSourceMask;
+
+struct _ArtMaskSourceMask {
+  ArtMaskSource super;
+  ArtRender *render;
+  art_boolean first;
+  int x0;
+  int y0;
+  int x1;
+  int y1;
+  const art_u8 *mask_buf;
+  int rowstride;
+};
+
+static void
+art_render_mask_done (ArtRenderCallback *self, ArtRender *render)
+{
+  art_free (self);
+}
+
+static int
+art_render_mask_can_drive (ArtMaskSource *self, ArtRender *render)
+{
+  return 0;
+}
+
+static void
+art_render_mask_render (ArtRenderCallback *self, ArtRender *render,
+			art_u8 *dest, int y)
+{
+  ArtMaskSourceMask *z = (ArtMaskSourceMask *)self;
+  int x0 = render->x0, x1 = render->x1;
+  int z_x0 = z->x0, z_x1 = z->x1;
+  int width = x1 - x0;
+  int z_width = z_x1 - z_x0;
+  art_u8 *alpha_buf = render->alpha_buf;
+
+  if (y < z->y0 || y >= z->y1 || z_width <= 0)
+    memset (alpha_buf, 0, width);
+  else
+    {
+      const art_u8 *src_line = z->mask_buf + (y - z->y0) * z->rowstride;
+      art_u8 *dst_line = alpha_buf + z_x0 - x0;
+
+      if (z_x0 > x0)
+	memset (alpha_buf, 0, z_x0 - x0);
+      
+      if (z->first)
+	memcpy (dst_line, src_line, z_width);
+      else
+	{
+	  int x;
+	  
+	  for (x = 0; x < z_width; x++)
+	    {
+	      int v;
+	      v = src_line[x];
+	      if (v)
+		{
+		  v = v * dst_line[x] + 0x80;
+		  v = (v + (v >> 8)) >> 8;
+		  dst_line[x] = v;
+		}
+	      else
+		{
+		  dst_line[x] = 0;
+		}
+	    }
+	}
+      
+      if (z_x1 < x1)
+	memset (alpha_buf + z_x1 - x0, 0, x1 - z_x1);
+    }
+}
+
+static void
+art_render_mask_prepare (ArtMaskSource *self, ArtRender *render,
+			 art_boolean first)
+{
+  ArtMaskSourceMask *z = (ArtMaskSourceMask *)self;
+  self->super.render = art_render_mask_render;
+  z->first = first;
+}
+
+/**
+ * art_render_mask: Use an alpha buffer as a render mask source.
+ * @render: Render object.
+ * @x0: Left coordinate of mask rect.
+ * @y0: Top coordinate of mask rect.
+ * @x1: Right coordinate of mask rect.
+ * @y1: Bottom coordinate of mask rect.
+ * @mask_buf: Buffer containing 8bpp alpha mask data.
+ * @rowstride: Rowstride of @mask_buf.
+ *
+ * Adds @mask_buf to the render object as a mask. Note: @mask_buf must
+ * remain allocated until art_render_invoke() is called on @render.
+ **/
+void
+art_render_mask (ArtRender *render,
+		 int x0, int y0, int x1, int y1,
+		 const art_u8 *mask_buf, int rowstride)
+{
+  ArtMaskSourceMask *mask_source;
+
+  if (x0 < render->x0)
+    {
+      mask_buf += render->x0 - x0;
+      x0 = render->x0;
+    }
+  if (x1 > render->x1)
+    x1 = render->x1;
+
+  if (y0 < render->y0)
+    {
+      mask_buf += (render->y0 - y0) * rowstride;
+      y0 = render->y0;
+    }
+  if (y1 > render->y1)
+    y1 = render->y1;
+
+  mask_source = art_new (ArtMaskSourceMask, 1);
+
+  mask_source->super.super.render = NULL;
+  mask_source->super.super.done = art_render_mask_done;
+  mask_source->super.can_drive = art_render_mask_can_drive;
+  mask_source->super.invoke_driver = NULL;
+  mask_source->super.prepare = art_render_mask_prepare;
+  mask_source->render = render;
+  mask_source->x0 = x0;
+  mask_source->y0 = y0;
+  mask_source->x1 = x1;
+  mask_source->y1 = y1;
+  mask_source->mask_buf = mask_buf;
+  mask_source->rowstride = rowstride;
+
+  art_render_add_mask_source (render, &mask_source->super);
+
+}

art_render_mask.h

@@ -0,0 +1,47 @@
+/*
+ * art_render_mask.h: Alpha mask source for modular rendering.
+ *
+ * Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors: Raph Levien <raph@acm.org>
+ */
+
+#ifndef __ART_RENDER_MASK_H__
+#define __ART_RENDER_MASK_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_render.h"
+#else
+#include <libart_lgpl/art_render.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+void
+art_render_mask (ArtRender *render,
+		 int x0, int y0, int x1, int y1,
+		 const art_u8 *mask_buf, int rowstride);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_RENDER_MASK_H__ */

art_render_svp.c

@@ -0,0 +1,421 @@
+/*
+ * art_render_gradient.c: SVP mask source for modular rendering.
+ *
+ * Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors: Raph Levien <raph@acm.org>
+ */
+
+#include "art_render_svp.h"
+#include "art_svp_render_aa.h"
+
+typedef struct _ArtMaskSourceSVP ArtMaskSourceSVP;
+
+struct _ArtMaskSourceSVP {
+  ArtMaskSource super;
+  ArtRender *render;
+  const ArtSVP *svp;
+  art_u8 *dest_ptr;
+};
+
+static void
+art_render_svp_done (ArtRenderCallback *self, ArtRender *render)
+{
+  art_free (self);
+}
+
+static int
+art_render_svp_can_drive (ArtMaskSource *self, ArtRender *render)
+{
+  return 10;
+}
+
+/* The basic art_render_svp_callback function is repeated four times,
+   for all combinations of non-unit opacity and generating spans. In
+   general, I'd consider this bad style, but in this case I plead
+   a measurable performance improvement. */
+
+static void
+art_render_svp_callback (void *callback_data, int y,
+			 int start, ArtSVPRenderAAStep *steps, int n_steps)
+{
+  ArtMaskSourceSVP *z = (ArtMaskSourceSVP *)callback_data;
+  ArtRender *render = z->render;
+  int n_run = 0;
+  int i;
+  int running_sum = start;
+  int x0 = render->x0;
+  int x1 = render->x1;
+  int run_x0, run_x1;
+  ArtRenderMaskRun *run = render->run;
+
+  if (n_steps > 0)
+    {
+      run_x1 = steps[0].x;
+      if (run_x1 > x0 && running_sum > 0x80ff)
+	{
+	  run[0].x = x0;
+	  run[0].alpha = running_sum;
+	  n_run++;
+	}
+
+      for (i = 0; i < n_steps - 1; i++)
+	{
+          running_sum += steps[i].delta;
+          run_x0 = run_x1;
+          run_x1 = steps[i + 1].x;
+	  if (run_x1 > run_x0)
+	    {
+	      run[n_run].x = run_x0;
+	      run[n_run].alpha = running_sum;
+	      n_run++;
+	    }
+	}
+      if (x1 > run_x1)
+	{
+	  running_sum += steps[n_steps - 1].delta;
+	  run[n_run].x = run_x1;
+	  run[n_run].alpha = running_sum;
+	  n_run++;
+	}
+      if (running_sum > 0x80ff)
+	{
+	  run[n_run].x = x1;
+	  run[n_run].alpha = 0x8000;
+	  n_run++;
+	}
+    }
+  else if ((running_sum >> 16) > 0)
+    {
+      run[0].x = x0;
+      run[0].alpha = running_sum;
+      run[1].x = x1;
+      run[1].alpha = running_sum;
+      n_run = 2;
+    }
+
+  render->n_run = n_run;
+
+  art_render_invoke_callbacks (render, z->dest_ptr, y);
+
+  z->dest_ptr += render->rowstride;
+}
+
+static void
+art_render_svp_callback_span (void *callback_data, int y,
+			      int start, ArtSVPRenderAAStep *steps, int n_steps)
+{
+  ArtMaskSourceSVP *z = (ArtMaskSourceSVP *)callback_data;
+  ArtRender *render = z->render;
+  int n_run = 0;
+  int n_span = 0;
+  int i;
+  int running_sum = start;
+  int x0 = render->x0;
+  int x1 = render->x1;
+  int run_x0, run_x1;
+  ArtRenderMaskRun *run = render->run;
+  int *span_x = render->span_x;
+
+  if (n_steps > 0)
+    {
+      run_x1 = steps[0].x;
+      if (run_x1 > x0 && running_sum > 0x80ff)
+	{
+	  run[0].x = x0;
+	  run[0].alpha = running_sum;
+	  n_run++;
+	  span_x[0] = x0;
+	  n_span++;
+	}
+
+      for (i = 0; i < n_steps - 1; i++)
+	{
+          running_sum += steps[i].delta;
+          run_x0 = run_x1;
+          run_x1 = steps[i + 1].x;
+	  if (run_x1 > run_x0)
+	    {
+	      run[n_run].x = run_x0;
+	      run[n_run].alpha = running_sum;
+	      n_run++;
+	      if ((n_span & 1) != (running_sum > 0x80ff))
+		span_x[n_span++] = run_x0;
+	    }
+	}
+      if (x1 > run_x1)
+	{
+	  running_sum += steps[n_steps - 1].delta;
+	  run[n_run].x = run_x1;
+	  run[n_run].alpha = running_sum;
+	  n_run++;
+	  if ((n_span & 1) != (running_sum > 0x80ff))
+	    span_x[n_span++] = run_x1;
+	}
+      if (running_sum > 0x80ff)
+	{
+	  run[n_run].x = x1;
+	  run[n_run].alpha = 0x8000;
+	  n_run++;
+	  span_x[n_span++] = x1;
+	}
+    }
+  else if ((running_sum >> 16) > 0)
+    {
+      run[0].x = x0;
+      run[0].alpha = running_sum;
+      run[1].x = x1;
+      run[1].alpha = running_sum;
+      n_run = 2;
+      span_x[0] = x0;
+      span_x[1] = x1;
+      n_span = 2;
+    }
+
+  render->n_run = n_run;
+  render->n_span = n_span;
+
+  art_render_invoke_callbacks (render, z->dest_ptr, y);
+
+  z->dest_ptr += render->rowstride;
+}
+
+static void
+art_render_svp_callback_opacity (void *callback_data, int y,
+				 int start, ArtSVPRenderAAStep *steps, int n_steps)
+{
+  ArtMaskSourceSVP *z = (ArtMaskSourceSVP *)callback_data;
+  ArtRender *render = z->render;
+  int n_run = 0;
+  int i;
+  art_u32 running_sum;
+  int x0 = render->x0;
+  int x1 = render->x1;
+  int run_x0, run_x1;
+  ArtRenderMaskRun *run = render->run;
+  art_u32 opacity = render->opacity;
+  art_u32 alpha;
+
+  running_sum = start - 0x7f80;
+
+  if (n_steps > 0)
+    {
+      run_x1 = steps[0].x;
+      alpha = ((running_sum >> 8) * opacity + 0x80080) >> 8;
+      if (run_x1 > x0 && alpha > 0x80ff)
+	{
+	  run[0].x = x0;
+	  run[0].alpha = alpha;
+	  n_run++;
+	}
+
+      for (i = 0; i < n_steps - 1; i++)
+	{
+          running_sum += steps[i].delta;
+          run_x0 = run_x1;
+          run_x1 = steps[i + 1].x;
+	  if (run_x1 > run_x0)
+	    {
+	      run[n_run].x = run_x0;
+	      alpha = ((running_sum >> 8) * opacity + 0x80080) >> 8;
+	      run[n_run].alpha = alpha;
+	      n_run++;
+	    }
+	}
+      if (x1 > run_x1)
+	{
+	  running_sum += steps[n_steps - 1].delta;
+	  run[n_run].x = run_x1;
+	  alpha = ((running_sum >> 8) * opacity + 0x80080) >> 8;
+	  run[n_run].alpha = alpha;
+	  n_run++;
+	}
+      if (alpha > 0x80ff)
+	{
+	  run[n_run].x = x1;
+	  run[n_run].alpha = 0x8000;
+	  n_run++;
+	}
+    }
+  else if ((running_sum >> 16) > 0)
+    {
+      run[0].x = x0;
+      run[0].alpha = running_sum;
+      run[1].x = x1;
+      run[1].alpha = running_sum;
+      n_run = 2;
+    }
+
+  render->n_run = n_run;
+
+  art_render_invoke_callbacks (render, z->dest_ptr, y);
+
+  z->dest_ptr += render->rowstride;
+}
+
+static void
+art_render_svp_callback_opacity_span (void *callback_data, int y,
+				      int start, ArtSVPRenderAAStep *steps, int n_steps)
+{
+  ArtMaskSourceSVP *z = (ArtMaskSourceSVP *)callback_data;
+  ArtRender *render = z->render;
+  int n_run = 0;
+  int n_span = 0;
+  int i;
+  art_u32 running_sum;
+  int x0 = render->x0;
+  int x1 = render->x1;
+  int run_x0, run_x1;
+  ArtRenderMaskRun *run = render->run;
+  int *span_x = render->span_x;
+  art_u32 opacity = render->opacity;
+  art_u32 alpha;
+
+  running_sum = start - 0x7f80;
+
+  if (n_steps > 0)
+    {
+      run_x1 = steps[0].x;
+      alpha = ((running_sum >> 8) * opacity + 0x800080) >> 8;
+      if (run_x1 > x0 && alpha > 0x80ff)
+	{
+	  run[0].x = x0;
+	  run[0].alpha = alpha;
+	  n_run++;
+	  span_x[0] = x0;
+	  n_span++;
+	}
+
+      for (i = 0; i < n_steps - 1; i++)
+	{
+          running_sum += steps[i].delta;
+          run_x0 = run_x1;
+          run_x1 = steps[i + 1].x;
+	  if (run_x1 > run_x0)
+	    {
+	      run[n_run].x = run_x0;
+	      alpha = ((running_sum >> 8) * opacity + 0x800080) >> 8;
+	      run[n_run].alpha = alpha;
+	      n_run++;
+	      if ((n_span & 1) != (alpha > 0x80ff))
+		span_x[n_span++] = run_x0;
+	    }
+	}
+      if (x1 > run_x1)
+	{
+	  running_sum += steps[n_steps - 1].delta;
+	  run[n_run].x = run_x1;
+	  alpha = ((running_sum >> 8) * opacity + 0x800080) >> 8;
+	  run[n_run].alpha = alpha;
+	  n_run++;
+	  if ((n_span & 1) != (alpha > 0x80ff))
+	    span_x[n_span++] = run_x1;
+	}
+      if (alpha > 0x80ff)
+	{
+	  run[n_run].x = x1;
+	  run[n_run].alpha = 0x8000;
+	  n_run++;
+	  span_x[n_span++] = x1;
+	}
+    }
+  else if ((running_sum >> 16) > 0)
+    {
+      run[0].x = x0;
+      run[0].alpha = running_sum;
+      run[1].x = x1;
+      run[1].alpha = running_sum;
+      n_run = 2;
+      span_x[0] = x0;
+      span_x[1] = x1;
+      n_span = 2;
+    }
+
+  render->n_run = n_run;
+  render->n_span = n_span;
+
+  art_render_invoke_callbacks (render, z->dest_ptr, y);
+
+  z->dest_ptr += render->rowstride;
+}
+
+static void
+art_render_svp_invoke_driver (ArtMaskSource *self, ArtRender *render)
+{
+  ArtMaskSourceSVP *z = (ArtMaskSourceSVP *)self;
+  void (*callback) (void *callback_data,
+		    int y,
+		    int start,
+		    ArtSVPRenderAAStep *steps, int n_steps);
+
+  z->dest_ptr = render->pixels;
+  if (render->opacity == 0x10000)
+    {
+      if (render->need_span)
+	callback = art_render_svp_callback_span;
+      else
+	callback = art_render_svp_callback;
+    }
+  else
+    {
+      if (render->need_span)
+	callback = art_render_svp_callback_opacity_span;
+      else
+	callback = art_render_svp_callback_opacity;
+    }
+
+  art_svp_render_aa (z->svp,
+		     render->x0, render->y0,
+		     render->x1, render->y1, callback,
+		     self);
+  art_render_svp_done (&self->super, render);
+}
+
+static void
+art_render_svp_prepare (ArtMaskSource *self, ArtRender *render,
+			art_boolean first)
+{
+  /* todo */
+  art_die ("art_render_svp non-driver mode not yet implemented.\n");
+}
+
+/**
+ * art_render_svp: Use an SVP as a render mask source.
+ * @render: Render object.
+ * @svp: SVP.
+ *
+ * Adds @svp to the render object as a mask. Note: @svp must remain
+ * allocated until art_render_invoke() is called on @render.
+ **/
+void
+art_render_svp (ArtRender *render, const ArtSVP *svp)
+{
+  ArtMaskSourceSVP *mask_source;
+  mask_source = art_new (ArtMaskSourceSVP, 1);
+
+  mask_source->super.super.render = NULL;
+  mask_source->super.super.done = art_render_svp_done;
+  mask_source->super.can_drive = art_render_svp_can_drive;
+  mask_source->super.invoke_driver = art_render_svp_invoke_driver;
+  mask_source->super.prepare = art_render_svp_prepare;
+  mask_source->render = render;
+  mask_source->svp = svp;
+
+  art_render_add_mask_source (render, &mask_source->super);
+}

art_render_svp.h

@@ -0,0 +1,47 @@
+/*
+ * art_render_svp.h: SVP mask source for modular rendering.
+ *
+ * Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors: Raph Levien <raph@acm.org>
+ */
+
+#ifndef __ART_RENDER_SVP_H__
+#define __ART_RENDER_SVP_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_render.h"
+#include "art_svp.h"
+#else
+#include <libart_lgpl/art_render.h>
+#include <libart_lgpl/art_svp.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+void
+art_render_svp (ArtRender *render, const ArtSVP *svp);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_RENDER_SVP_H__ */

art_rgb.c

@@ -0,0 +1,175 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_rgb.h"
+
+#include <string.h>	/* for memset */
+
+/* Basic operators for manipulating 24-bit packed RGB buffers. */
+
+#define COLOR_RUN_COMPLEX
+
+#ifdef COLOR_RUN_SIMPLE
+/* This is really slow. Is there any way we might speed it up?
+   Two ideas:
+
+   First, maybe we should be working at 32-bit alignment. Then,
+   this can be a simple loop over word stores.
+
+   Second, we can keep working at 24-bit alignment, but have some
+   intelligence about storing. For example, we can iterate over
+   4-pixel chunks (aligned at 4 pixels), with an inner loop
+   something like:
+
+   *buf++ = v1;
+   *buf++ = v2;
+   *buf++ = v3;
+
+   One source of extra complexity is the need to make sure linebuf is
+   aligned to a 32-bit boundary.
+
+   This second alternative has some complexity to it, but is
+   appealing because it really minimizes the memory bandwidth. */
+void
+art_rgb_fill_run (art_u8 *buf, art_u8 r, art_u8 g, art_u8 b, gint n)
+{
+  int i;
+
+  if (r == g && g == b)
+    {
+      memset (buf, g, n + n + n);
+    }
+  else
+    {
+      for (i = 0; i < n; i++)
+	{
+	  *buf++ = r;
+	  *buf++ = g;
+	  *buf++ = b;
+	}
+    }
+}
+#endif
+
+#ifdef COLOR_RUN_COMPLEX
+/* This implements the second of the two ideas above. The test results
+   are _very_ encouraging - it seems the speed is within 10% of
+   memset, which is quite good! */
+/**
+ * art_rgb_fill_run: fill a buffer a solid RGB color.
+ * @buf: Buffer to fill.
+ * @r: Red, range 0..255.
+ * @g: Green, range 0..255.
+ * @b: Blue, range 0..255.
+ * @n: Number of RGB triples to fill.
+ *
+ * Fills a buffer with @n copies of the (@r, @g, @b) triple. Thus,
+ * locations @buf (inclusive) through @buf + 3 * @n (exclusive) are
+ * written.
+ *
+ * The implementation of this routine is very highly optimized.
+ **/
+void
+art_rgb_fill_run (art_u8 *buf, art_u8 r, art_u8 g, art_u8 b, int n)
+{
+  int i;
+  unsigned int v1, v2, v3;
+
+  if (r == g && g == b)
+    {
+      memset (buf, g, n + n + n);
+    }
+  else
+    {
+      if (n < 8)
+	{
+	  for (i = 0; i < n; i++)
+	    {
+	      *buf++ = r;
+	      *buf++ = g;
+	      *buf++ = b;
+	    }
+	} else {
+	  /* handle prefix up to byte alignment */
+	  /* I'm worried about this cast on sizeof(long) != sizeof(uchar *)
+	     architectures, but it _should_ work. */
+	  for (i = 0; ((unsigned long)buf) & 3; i++)
+	    {
+	      *buf++ = r;
+	      *buf++ = g;
+	      *buf++ = b;
+	    }
+#ifndef WORDS_BIGENDIAN
+	  v1 = r | (g << 8) | (b << 16) | (r << 24);
+	  v3 = (v1 << 8) | b;
+	  v2 = (v3 << 8) | g;
+#else
+	  v1 = (r << 24) | (g << 16) | (b << 8) | r;
+	  v2 = (v1 << 8) | g;
+	  v3 = (v2 << 8) | b;
+#endif
+	  for (; i < n - 3; i += 4)
+	    {
+	      ((art_u32 *)buf)[0] = v1;
+	      ((art_u32 *)buf)[1] = v2;
+	      ((art_u32 *)buf)[2] = v3;
+	      buf += 12;
+	    }
+	  /* handle postfix */
+	  for (; i < n; i++)
+	    {
+	      *buf++ = r;
+	      *buf++ = g;
+	      *buf++ = b;
+	    }
+	}
+    }
+}
+#endif
+
+/**
+ * art_rgb_run_alpha: Render semitransparent color over RGB buffer.
+ * @buf: Buffer for rendering.
+ * @r: Red, range 0..255.
+ * @g: Green, range 0..255.
+ * @b: Blue, range 0..255.
+ * @alpha: Alpha, range 0..256.
+ * @n: Number of RGB triples to render.
+ *
+ * Renders a sequential run of solid (@r, @g, @b) color over @buf with
+ * opacity @alpha.
+ **/
+void
+art_rgb_run_alpha (art_u8 *buf, art_u8 r, art_u8 g, art_u8 b, int alpha, int n)
+{
+  int i;
+  int v;
+
+  for (i = 0; i < n; i++)
+    {
+      v = *buf;
+      *buf++ = v + (((r - v) * alpha + 0x80) >> 8);
+      v = *buf;
+      *buf++ = v + (((g - v) * alpha + 0x80) >> 8);
+      v = *buf;
+      *buf++ = v + (((b - v) * alpha + 0x80) >> 8);
+    }
+}
+

art_rgb.h

@@ -0,0 +1,44 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_RGB_H__
+#define __ART_RGB_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_misc.h"
+#else
+#include <libart_lgpl/art_misc.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void
+art_rgb_fill_run (art_u8 *buf, art_u8 r, art_u8 g, art_u8 b, int n);
+
+void
+art_rgb_run_alpha (art_u8 *buf, art_u8 r, art_u8 g, art_u8 b, int alpha,
+		   int n);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

art_rgb_a_affine.c

@@ -0,0 +1,149 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_rgb_a_affine.h"
+
+#include <math.h>
+
+#include "art_affine.h"
+#include "art_point.h"
+#include "art_rgb_affine_private.h"
+
+/* This module handles compositing of affine-transformed alpha only images
+   over rgb pixel buffers. */
+
+/* Composite the source image over the destination image, applying the
+   affine transform. */
+
+/**
+ * art_rgb_a_affine: Affine transform source Alpha image and composite.
+ * @dst: Destination image RGB buffer.
+ * @x0: Left coordinate of destination rectangle.
+ * @y0: Top coordinate of destination rectangle.
+ * @x1: Right coordinate of destination rectangle.
+ * @y1: Bottom coordinate of destination rectangle.
+ * @dst_rowstride: Rowstride of @dst buffer.
+ * @src: Source image alpha buffer.
+ * @src_width: Width of source image.
+ * @src_height: Height of source image.
+ * @src_rowstride: Rowstride of @src buffer.
+ * @rgb: RGB foreground color, in 0xRRGGBB.
+ * @affine: Affine transform.
+ * @level: Filter level.
+ * @alphagamma: #ArtAlphaGamma for gamma-correcting the compositing.
+ *
+ * Affine transform the solid color rgb with alpha specified by the
+ * source image stored in @src, compositing over the area of destination
+ * image @dst specified by the rectangle (@x0, @y0) - (@x1, @y1).
+ * As usual in libart, the left and top edges of this rectangle are
+ * included, and the right and bottom edges are excluded.
+ *
+ * The @alphagamma parameter specifies that the alpha compositing be
+ * done in a gamma-corrected color space. In the current
+ * implementation, it is ignored.
+ *
+ * The @level parameter specifies the speed/quality tradeoff of the
+ * image interpolation. Currently, only ART_FILTER_NEAREST is
+ * implemented.
+ **/
+void
+art_rgb_a_affine (art_u8 *dst,
+		  int x0, int y0, int x1, int y1, int dst_rowstride,
+		  const art_u8 *src,
+		  int src_width, int src_height, int src_rowstride,
+		  art_u32 rgb,
+		  const double affine[6],
+		  ArtFilterLevel level,
+		  ArtAlphaGamma *alphagamma)
+{
+  /* Note: this is a slow implementation, and is missing all filter
+     levels other than NEAREST. It is here for clarity of presentation
+     and to establish the interface. */
+  int x, y;
+  double inv[6];
+  art_u8 *dst_p, *dst_linestart;
+  const art_u8 *src_p;
+  ArtPoint pt, src_pt;
+  int src_x, src_y;
+  int alpha;
+  art_u8 bg_r, bg_g, bg_b;
+  art_u8 fg_r, fg_g, fg_b;
+  int tmp;
+  int run_x0, run_x1;
+  art_u8 r, g, b;
+
+  r = (rgb>>16)&0xff;
+  g = (rgb>>8)&0xff;
+  b = (rgb)&0xff;
+
+  dst_linestart = dst;
+  art_affine_invert (inv, affine);
+  for (y = y0; y < y1; y++)
+    {
+      pt.y = y + 0.5;
+      run_x0 = x0;
+      run_x1 = x1;
+      art_rgb_affine_run (&run_x0, &run_x1, y, src_width, src_height,
+			  inv);
+      dst_p = dst_linestart + (run_x0 - x0) * 3;
+      for (x = run_x0; x < run_x1; x++)
+	{
+	  pt.x = x + 0.5;
+	  art_affine_point (&src_pt, &pt, inv);
+	  src_x = floor (src_pt.x);
+	  src_y = floor (src_pt.y);
+	  src_p = src + (src_y * src_rowstride) + src_x;
+	  if (src_x >= 0 && src_x < src_width &&
+	      src_y >= 0 && src_y < src_height)
+	    {
+
+	  alpha = *src_p;
+	  if (alpha)
+	    {
+	      if (alpha == 255)
+		{
+		  dst_p[0] = r;
+		  dst_p[1] = g;
+		  dst_p[2] = b;
+		}
+	      else
+		{
+		  bg_r = dst_p[0];
+		  bg_g = dst_p[1];
+		  bg_b = dst_p[2];
+		  
+		  tmp = (r - bg_r) * alpha;
+		  fg_r = bg_r + ((tmp + (tmp >> 8) + 0x80) >> 8);
+		  tmp = (g - bg_g) * alpha;
+		  fg_g = bg_g + ((tmp + (tmp >> 8) + 0x80) >> 8);
+		  tmp = (b - bg_b) * alpha;
+		  fg_b = bg_b + ((tmp + (tmp >> 8) + 0x80) >> 8);
+		  
+		  dst_p[0] = fg_r;
+		  dst_p[1] = fg_g;
+		  dst_p[2] = fg_b;
+		}
+	    }
+	    } else { dst_p[0] = 255; dst_p[1] = 0; dst_p[2] = 0; }
+	  dst_p += 3;
+	}
+      dst_linestart += dst_rowstride;
+    }
+}

art_rgb_a_affine.h

@@ -0,0 +1,52 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_RGB_A_AFFINE_H__
+#define __ART_RGB_A_AFFINE_H__
+
+/* This module handles compositing of affine-transformed alpha only images
+   over rgb pixel buffers. */
+
+#ifdef LIBART_COMPILATION
+#include "art_filterlevel.h"
+#include "art_alphagamma.h"
+#else
+#include <libart_lgpl/art_filterlevel.h>
+#include <libart_lgpl/art_alphagamma.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void
+art_rgb_a_affine (art_u8 *dst,
+		  int x0, int y0, int x1, int y1, int dst_rowstride,
+		  const art_u8 *src,
+		  int src_width, int src_height, int src_rowstride,
+		  art_u32 rgb,
+		  const double affine[6],
+		  ArtFilterLevel level,
+		  ArtAlphaGamma *alphagamma);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

art_rgb_affine.c

@@ -0,0 +1,106 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_rgb_affine.h"
+
+#include <math.h>
+#include "art_misc.h"
+#include "art_point.h"
+#include "art_affine.h"
+#include "art_rgb_affine_private.h"
+
+/* This module handles compositing of affine-transformed rgb images
+   over rgb pixel buffers. */
+
+/**
+ * art_rgb_affine: Affine transform source RGB image and composite.
+ * @dst: Destination image RGB buffer.
+ * @x0: Left coordinate of destination rectangle.
+ * @y0: Top coordinate of destination rectangle.
+ * @x1: Right coordinate of destination rectangle.
+ * @y1: Bottom coordinate of destination rectangle.
+ * @dst_rowstride: Rowstride of @dst buffer.
+ * @src: Source image RGB buffer.
+ * @src_width: Width of source image.
+ * @src_height: Height of source image.
+ * @src_rowstride: Rowstride of @src buffer.
+ * @affine: Affine transform.
+ * @level: Filter level.
+ * @alphagamma: #ArtAlphaGamma for gamma-correcting the compositing.
+ *
+ * Affine transform the source image stored in @src, compositing over
+ * the area of destination image @dst specified by the rectangle
+ * (@x0, @y0) - (@x1, @y1). As usual in libart, the left and top edges
+ * of this rectangle are included, and the right and bottom edges are
+ * excluded.
+ *
+ * The @alphagamma parameter specifies that the alpha compositing be done
+ * in a gamma-corrected color space. Since the source image is opaque RGB,
+ * this argument only affects the edges. In the current implementation,
+ * it is ignored.
+ *
+ * The @level parameter specifies the speed/quality tradeoff of the
+ * image interpolation. Currently, only ART_FILTER_NEAREST is
+ * implemented.
+ **/
+void
+art_rgb_affine (art_u8 *dst, int x0, int y0, int x1, int y1, int dst_rowstride,
+		const art_u8 *src,
+		int src_width, int src_height, int src_rowstride,
+		const double affine[6],
+		ArtFilterLevel level,
+		ArtAlphaGamma *alphagamma)
+{
+  /* Note: this is a slow implementation, and is missing all filter
+     levels other than NEAREST. It is here for clarity of presentation
+     and to establish the interface. */
+  int x, y;
+  double inv[6];
+  art_u8 *dst_p, *dst_linestart;
+  const art_u8 *src_p;
+  ArtPoint pt, src_pt;
+  int src_x, src_y;
+  int run_x0, run_x1;
+
+  dst_linestart = dst;
+  art_affine_invert (inv, affine);
+  for (y = y0; y < y1; y++)
+    {
+      pt.y = y + 0.5;
+      run_x0 = x0;
+      run_x1 = x1;
+      art_rgb_affine_run (&run_x0, &run_x1, y, src_width, src_height,
+			  inv);
+      dst_p = dst_linestart + (run_x0 - x0) * 3;
+      for (x = run_x0; x < run_x1; x++)
+	{
+	  pt.x = x + 0.5;
+	  art_affine_point (&src_pt, &pt, inv);
+	  src_x = floor (src_pt.x);
+	  src_y = floor (src_pt.y);
+	  src_p = src + (src_y * src_rowstride) + src_x * 3;
+	  dst_p[0] = src_p[0];
+	  dst_p[1] = src_p[1];
+	  dst_p[2] = src_p[2];
+	  dst_p += 3;
+	}
+      dst_linestart += dst_rowstride;
+    }
+}

art_rgb_affine.h

@@ -0,0 +1,50 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_RGB_AFFINE_H__
+#define __ART_RGB_AFFINE_H__
+
+/* This module handles compositing of affine-transformed rgb images
+   over rgb pixel buffers. */
+
+#ifdef LIBART_COMPILATION
+#include "art_filterlevel.h"
+#include "art_alphagamma.h"
+#else
+#include <libart_lgpl/art_filterlevel.h>
+#include <libart_lgpl/art_alphagamma.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void
+art_rgb_affine (art_u8 *dst, int x0, int y0, int x1, int y1, int dst_rowstride,
+		const art_u8 *src,
+		int src_width, int src_height, int src_rowstride,
+		const double affine[6],
+		ArtFilterLevel level,
+		ArtAlphaGamma *alphagamma);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

art_rgb_affine_private.c

@@ -0,0 +1,127 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_rgb_affine_private.h"
+
+#include <math.h>
+#include "art_misc.h"
+#include "art_point.h"
+#include "art_affine.h"
+
+/* Private functions for the rgb affine image compositors - primarily,
+   the determination of runs, eliminating the need for source image
+   bbox calculation in the inner loop. */
+
+/* Determine a "run", such that the inverse affine of all pixels from
+   (x0, y) inclusive to (x1, y) exclusive fit within the bounds
+   of the source image.
+
+   Initial values of x0, x1, and result values stored in first two
+   pointer arguments.
+*/
+
+#define EPSILON 1e-6
+
+void
+art_rgb_affine_run (int *p_x0, int *p_x1, int y,
+		    int src_width, int src_height,
+		    const double affine[6])
+{
+  int x0, x1;
+  double z;
+  double x_intercept;
+  int xi;
+
+  x0 = *p_x0;
+  x1 = *p_x1;
+
+  /* do left and right edges */
+  if (affine[0] > EPSILON)
+    {
+      z = affine[2] * (y + 0.5) + affine[4];
+      x_intercept = -z / affine[0];
+      xi = ceil (x_intercept + EPSILON - 0.5);
+      if (xi > x0)
+	x0 = xi;
+      x_intercept = (-z + src_width) / affine[0];
+      xi = ceil (x_intercept - EPSILON - 0.5);
+      if (xi < x1)
+	x1 = xi;
+    }
+  else if (affine[0] < -EPSILON)
+    {
+      z = affine[2] * (y + 0.5) + affine[4];
+      x_intercept = (-z + src_width) / affine[0];
+      xi = ceil (x_intercept + EPSILON - 0.5);
+      if (xi > x0)
+	x0 = xi;
+      x_intercept = -z / affine[0];
+      xi = ceil (x_intercept - EPSILON - 0.5);
+      if (xi < x1)
+	x1 = xi;
+    }
+  else
+    {
+      z = affine[2] * (y + 0.5) + affine[4];
+      if (z < 0 || z >= src_width)
+	{
+	  *p_x1 = *p_x0;
+	  return;
+	}
+    }
+
+  /* do top and bottom edges */
+  if (affine[1] > EPSILON)
+    {
+      z = affine[3] * (y + 0.5) + affine[5];
+      x_intercept = -z / affine[1];
+      xi = ceil (x_intercept + EPSILON - 0.5);
+      if (xi > x0)
+	x0 = xi;
+      x_intercept = (-z + src_height) / affine[1];
+      xi = ceil (x_intercept - EPSILON - 0.5);
+      if (xi < x1)
+	x1 = xi;
+    }
+  else if (affine[1] < -EPSILON)
+    {
+      z = affine[3] * (y + 0.5) + affine[5];
+      x_intercept = (-z + src_height) / affine[1];
+      xi = ceil (x_intercept + EPSILON - 0.5);
+      if (xi > x0)
+	x0 = xi;
+      x_intercept = -z / affine[1];
+      xi = ceil (x_intercept - EPSILON - 0.5);
+      if (xi < x1)
+	x1 = xi;
+    }
+  else
+    {
+      z = affine[3] * (y + 0.5) + affine[5];
+      if (z < 0 || z >= src_height)
+	{
+	  *p_x1 = *p_x0;
+	  return;
+	}
+    }
+
+  *p_x0 = x0;
+  *p_x1 = x1;
+}

art_rgb_affine_private.h

@@ -0,0 +1,39 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_RGB_AFFINE_PRIVATE_H__
+#define __ART_RGB_AFFINE_PRIVATE_H__
+
+/* This module handles compositing of affine-transformed rgb images
+   over rgb pixel buffers. */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void
+art_rgb_affine_run (int *p_x0, int *p_x1, int y,
+		    int src_width, int src_height,
+		    const double affine[6]);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

art_rgb_bitmap_affine.c

@@ -0,0 +1,198 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_rgb_bitmap_affine.h"
+
+#include <math.h>
+#include "art_misc.h"
+#include "art_point.h"
+#include "art_affine.h"
+#include "art_rgb_affine_private.h"
+
+/* This module handles compositing of affine-transformed bitmap images
+   over rgb pixel buffers. */
+
+/* Composite the source image over the destination image, applying the
+   affine transform. Foreground color is given and assumed to be
+   opaque, background color is assumed to be fully transparent. */
+
+static void
+art_rgb_bitmap_affine_opaque (art_u8 *dst,
+			      int x0, int y0, int x1, int y1,
+			      int dst_rowstride,
+			      const art_u8 *src,
+			      int src_width, int src_height, int src_rowstride,
+			      art_u32 rgb,
+			      const double affine[6],
+			      ArtFilterLevel level,
+			      ArtAlphaGamma *alphagamma)
+{
+  /* Note: this is a slow implementation, and is missing all filter
+     levels other than NEAREST. It is here for clarity of presentation
+     and to establish the interface. */
+  int x, y;
+  double inv[6];
+  art_u8 *dst_p, *dst_linestart;
+  const art_u8 *src_p;
+  ArtPoint pt, src_pt;
+  int src_x, src_y;
+  art_u8 r, g, b;
+  int run_x0, run_x1;
+
+  r = rgb >> 16;
+  g = (rgb >> 8) & 0xff;
+  b = rgb & 0xff;
+  dst_linestart = dst;
+  art_affine_invert (inv, affine);
+  for (y = y0; y < y1; y++)
+    {
+      pt.y = y + 0.5;
+      run_x0 = x0;
+      run_x1 = x1;
+      art_rgb_affine_run (&run_x0, &run_x1, y, src_width, src_height,
+			  inv);
+      dst_p = dst_linestart + (run_x0 - x0) * 3;
+      for (x = run_x0; x < run_x1; x++)
+	{
+	  pt.x = x + 0.5;
+	  art_affine_point (&src_pt, &pt, inv);
+	  src_x = floor (src_pt.x);
+	  src_y = floor (src_pt.y);
+	  src_p = src + (src_y * src_rowstride) + (src_x >> 3);
+	  if (*src_p & (128 >> (src_x & 7)))
+	    {
+	      dst_p[0] = r;
+	      dst_p[1] = g;
+	      dst_p[2] = b;
+	    }
+	  dst_p += 3;
+	}
+      dst_linestart += dst_rowstride;
+    }
+}
+/* Composite the source image over the destination image, applying the
+   affine transform. Foreground color is given, background color is
+   assumed to be fully transparent. */
+
+/**
+ * art_rgb_bitmap_affine: Affine transform source bitmap image and composite.
+ * @dst: Destination image RGB buffer.
+ * @x0: Left coordinate of destination rectangle.
+ * @y0: Top coordinate of destination rectangle.
+ * @x1: Right coordinate of destination rectangle.
+ * @y1: Bottom coordinate of destination rectangle.
+ * @dst_rowstride: Rowstride of @dst buffer.
+ * @src: Source image bitmap buffer.
+ * @src_width: Width of source image.
+ * @src_height: Height of source image.
+ * @src_rowstride: Rowstride of @src buffer.
+ * @rgba: RGBA foreground color, in 0xRRGGBBAA.
+ * @affine: Affine transform.
+ * @level: Filter level.
+ * @alphagamma: #ArtAlphaGamma for gamma-correcting the compositing.
+ *
+ * Affine transform the source image stored in @src, compositing over
+ * the area of destination image @dst specified by the rectangle
+ * (@x0, @y0) - (@x1, @y1).
+ *
+ * The source bitmap stored with MSB as the leftmost pixel. Source 1
+ * bits correspond to the semitransparent color @rgba, while source 0
+ * bits are transparent.
+ *
+ * See art_rgb_affine() for a description of additional parameters.
+ **/
+void
+art_rgb_bitmap_affine (art_u8 *dst,
+		       int x0, int y0, int x1, int y1, int dst_rowstride,
+		       const art_u8 *src,
+		       int src_width, int src_height, int src_rowstride,
+		       art_u32 rgba,
+		       const double affine[6],
+		       ArtFilterLevel level,
+		       ArtAlphaGamma *alphagamma)
+{
+  /* Note: this is a slow implementation, and is missing all filter
+     levels other than NEAREST. It is here for clarity of presentation
+     and to establish the interface. */
+  int x, y;
+  double inv[6];
+  art_u8 *dst_p, *dst_linestart;
+  const art_u8 *src_p;
+  ArtPoint pt, src_pt;
+  int src_x, src_y;
+  int alpha;
+  art_u8 bg_r, bg_g, bg_b;
+  art_u8 fg_r, fg_g, fg_b;
+  art_u8 r, g, b;
+  int run_x0, run_x1;
+
+  alpha = rgba & 0xff;
+  if (alpha == 0xff)
+    {
+      art_rgb_bitmap_affine_opaque (dst, x0, y0, x1, y1, dst_rowstride,
+				    src,
+				    src_width, src_height, src_rowstride,
+				    rgba >> 8,
+				    affine,
+				    level,
+				    alphagamma);
+      return;
+    }
+  /* alpha = (65536 * alpha) / 255; */
+  alpha = (alpha << 8) + alpha + (alpha >> 7);
+  r = rgba >> 24;
+  g = (rgba >> 16) & 0xff;
+  b = (rgba >> 8) & 0xff;
+  dst_linestart = dst;
+  art_affine_invert (inv, affine);
+  for (y = y0; y < y1; y++)
+    {
+      pt.y = y + 0.5;
+      run_x0 = x0;
+      run_x1 = x1;
+      art_rgb_affine_run (&run_x0, &run_x1, y, src_width, src_height,
+			  inv);
+      dst_p = dst_linestart + (run_x0 - x0) * 3;
+      for (x = run_x0; x < run_x1; x++)
+	{
+	  pt.x = x + 0.5;
+	  art_affine_point (&src_pt, &pt, inv);
+	  src_x = floor (src_pt.x);
+	  src_y = floor (src_pt.y);
+	  src_p = src + (src_y * src_rowstride) + (src_x >> 3);
+	  if (*src_p & (128 >> (src_x & 7)))
+	    {
+	      bg_r = dst_p[0];
+	      bg_g = dst_p[1];
+	      bg_b = dst_p[2];
+
+	      fg_r = bg_r + (((r - bg_r) * alpha + 0x8000) >> 16);
+	      fg_g = bg_g + (((g - bg_g) * alpha + 0x8000) >> 16);
+	      fg_b = bg_b + (((b - bg_b) * alpha + 0x8000) >> 16);
+
+	      dst_p[0] = fg_r;
+	      dst_p[1] = fg_g;
+	      dst_p[2] = fg_b;
+	    }
+	  dst_p += 3;
+	}
+      dst_linestart += dst_rowstride;
+    }
+}

art_rgb_bitmap_affine.h

@@ -0,0 +1,52 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_RGB_BITMAP_AFFINE_H__
+#define __ART_RGB_BITMAP_AFFINE_H__
+
+/* This module handles compositing of affine-transformed bitmap images
+   over rgb pixel buffers. */
+
+#ifdef LIBART_COMPILATION
+#include "art_filterlevel.h"
+#include "art_alphagamma.h"
+#else
+#include <libart_lgpl/art_filterlevel.h>
+#include <libart_lgpl/art_alphagamma.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void
+art_rgb_bitmap_affine (art_u8 *dst,
+		       int x0, int y0, int x1, int y1, int dst_rowstride,
+		       const art_u8 *src,
+		       int src_width, int src_height, int src_rowstride,
+		       art_u32 rgba,
+		       const double affine[6],
+		       ArtFilterLevel level,
+		       ArtAlphaGamma *alphagamma);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

art_rgb_pixbuf_affine.c

@@ -0,0 +1,104 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_rgb_pixbuf_affine.h"
+
+#include <math.h>
+#include "art_misc.h"
+#include "art_point.h"
+#include "art_affine.h"
+#include "art_pixbuf.h"
+#include "art_rgb_affine.h"
+#include "art_rgb_affine.h"
+#include "art_rgb_rgba_affine.h"
+
+/* This module handles compositing of affine-transformed generic
+   pixbuf images over rgb pixel buffers. */
+
+/* Composite the source image over the destination image, applying the
+   affine transform. */
+/**
+ * art_rgb_pixbuf_affine: Affine transform source RGB pixbuf and composite.
+ * @dst: Destination image RGB buffer.
+ * @x0: Left coordinate of destination rectangle.
+ * @y0: Top coordinate of destination rectangle.
+ * @x1: Right coordinate of destination rectangle.
+ * @y1: Bottom coordinate of destination rectangle.
+ * @dst_rowstride: Rowstride of @dst buffer.
+ * @pixbuf: source image pixbuf.
+ * @affine: Affine transform.
+ * @level: Filter level.
+ * @alphagamma: #ArtAlphaGamma for gamma-correcting the compositing.
+ *
+ * Affine transform the source image stored in @src, compositing over
+ * the area of destination image @dst specified by the rectangle
+ * (@x0, @y0) - (@x1, @y1). As usual in libart, the left and top edges
+ * of this rectangle are included, and the right and bottom edges are
+ * excluded.
+ *
+ * The @alphagamma parameter specifies that the alpha compositing be
+ * done in a gamma-corrected color space. In the current
+ * implementation, it is ignored.
+ *
+ * The @level parameter specifies the speed/quality tradeoff of the
+ * image interpolation. Currently, only ART_FILTER_NEAREST is
+ * implemented.
+ **/
+void
+art_rgb_pixbuf_affine (art_u8 *dst,
+		       int x0, int y0, int x1, int y1, int dst_rowstride,
+		       const ArtPixBuf *pixbuf,
+		       const double affine[6],
+		       ArtFilterLevel level,
+		       ArtAlphaGamma *alphagamma)
+{
+  if (pixbuf->format != ART_PIX_RGB)
+    {
+      art_warn ("art_rgb_pixbuf_affine: need RGB format image\n");
+      return;
+    }
+
+  if (pixbuf->bits_per_sample != 8)
+    {
+      art_warn ("art_rgb_pixbuf_affine: need 8-bit sample data\n");
+      return;
+    }
+
+  if (pixbuf->n_channels != 3 + (pixbuf->has_alpha != 0))
+    {
+      art_warn ("art_rgb_pixbuf_affine: need 8-bit sample data\n");
+      return;
+    }
+
+  if (pixbuf->has_alpha)
+    art_rgb_rgba_affine (dst, x0, y0, x1, y1, dst_rowstride,
+			 pixbuf->pixels,
+			 pixbuf->width, pixbuf->height, pixbuf->rowstride,
+			 affine,
+			 level,
+			 alphagamma);
+  else
+    art_rgb_affine (dst, x0, y0, x1, y1, dst_rowstride,
+		    pixbuf->pixels,
+		    pixbuf->width, pixbuf->height, pixbuf->rowstride,
+		    affine,
+		    level,
+		    alphagamma);
+}

art_rgb_pixbuf_affine.h

@@ -0,0 +1,52 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_RGB_PIXBUF_AFFINE_H__
+#define __ART_RGB_PIXBUF_AFFINE_H__
+
+/* This module handles compositing of affine-transformed generic
+   pixbuf images over rgb pixel buffers. */
+
+#ifdef LIBART_COMPILATION
+#include "art_filterlevel.h"
+#include "art_alphagamma.h"
+#include "art_pixbuf.h"
+#else
+#include <libart_lgpl/art_filterlevel.h>
+#include <libart_lgpl/art_alphagamma.h>
+#include <libart_lgpl/art_pixbuf.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void
+art_rgb_pixbuf_affine (art_u8 *dst,
+		       int x0, int y0, int x1, int y1, int dst_rowstride,
+		       const ArtPixBuf *pixbuf,
+		       const double affine[6],
+		       ArtFilterLevel level,
+		       ArtAlphaGamma *alphagamma);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

art_rgb_rgba_affine.c

@@ -0,0 +1,142 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_rgb_rgba_affine.h"
+
+#include <math.h>
+#include "art_misc.h"
+#include "art_point.h"
+#include "art_affine.h"
+#include "art_rgb_affine_private.h"
+
+/* This module handles compositing of affine-transformed rgba images
+   over rgb pixel buffers. */
+
+/* Composite the source image over the destination image, applying the
+   affine transform. */
+
+/**
+ * art_rgb_rgba_affine: Affine transform source RGBA image and composite.
+ * @dst: Destination image RGB buffer.
+ * @x0: Left coordinate of destination rectangle.
+ * @y0: Top coordinate of destination rectangle.
+ * @x1: Right coordinate of destination rectangle.
+ * @y1: Bottom coordinate of destination rectangle.
+ * @dst_rowstride: Rowstride of @dst buffer.
+ * @src: Source image RGBA buffer.
+ * @src_width: Width of source image.
+ * @src_height: Height of source image.
+ * @src_rowstride: Rowstride of @src buffer.
+ * @affine: Affine transform.
+ * @level: Filter level.
+ * @alphagamma: #ArtAlphaGamma for gamma-correcting the compositing.
+ *
+ * Affine transform the source image stored in @src, compositing over
+ * the area of destination image @dst specified by the rectangle
+ * (@x0, @y0) - (@x1, @y1). As usual in libart, the left and top edges
+ * of this rectangle are included, and the right and bottom edges are
+ * excluded.
+ *
+ * The @alphagamma parameter specifies that the alpha compositing be
+ * done in a gamma-corrected color space. In the current
+ * implementation, it is ignored.
+ *
+ * The @level parameter specifies the speed/quality tradeoff of the
+ * image interpolation. Currently, only ART_FILTER_NEAREST is
+ * implemented.
+ **/
+void
+art_rgb_rgba_affine (art_u8 *dst,
+		     int x0, int y0, int x1, int y1, int dst_rowstride,
+		     const art_u8 *src,
+		     int src_width, int src_height, int src_rowstride,
+		     const double affine[6],
+		     ArtFilterLevel level,
+		     ArtAlphaGamma *alphagamma)
+{
+  /* Note: this is a slow implementation, and is missing all filter
+     levels other than NEAREST. It is here for clarity of presentation
+     and to establish the interface. */
+  int x, y;
+  double inv[6];
+  art_u8 *dst_p, *dst_linestart;
+  const art_u8 *src_p;
+  ArtPoint pt, src_pt;
+  int src_x, src_y;
+  int alpha;
+  art_u8 bg_r, bg_g, bg_b;
+  art_u8 fg_r, fg_g, fg_b;
+  int tmp;
+  int run_x0, run_x1;
+
+  dst_linestart = dst;
+  art_affine_invert (inv, affine);
+  for (y = y0; y < y1; y++)
+    {
+      pt.y = y + 0.5;
+      run_x0 = x0;
+      run_x1 = x1;
+      art_rgb_affine_run (&run_x0, &run_x1, y, src_width, src_height,
+			  inv);
+      dst_p = dst_linestart + (run_x0 - x0) * 3;
+      for (x = run_x0; x < run_x1; x++)
+	{
+	  pt.x = x + 0.5;
+	  art_affine_point (&src_pt, &pt, inv);
+	  src_x = floor (src_pt.x);
+	  src_y = floor (src_pt.y);
+	  src_p = src + (src_y * src_rowstride) + src_x * 4;
+	  if (src_x >= 0 && src_x < src_width &&
+	      src_y >= 0 && src_y < src_height)
+	    {
+
+	  alpha = src_p[3];
+	  if (alpha)
+	    {
+	      if (alpha == 255)
+		{
+		  dst_p[0] = src_p[0];
+		  dst_p[1] = src_p[1];
+		  dst_p[2] = src_p[2];
+		}
+	      else
+		{
+		  bg_r = dst_p[0];
+		  bg_g = dst_p[1];
+		  bg_b = dst_p[2];
+		  
+		  tmp = (src_p[0] - bg_r) * alpha;
+		  fg_r = bg_r + ((tmp + (tmp >> 8) + 0x80) >> 8);
+		  tmp = (src_p[1] - bg_g) * alpha;
+		  fg_g = bg_g + ((tmp + (tmp >> 8) + 0x80) >> 8);
+		  tmp = (src_p[2] - bg_b) * alpha;
+		  fg_b = bg_b + ((tmp + (tmp >> 8) + 0x80) >> 8);
+		  
+		  dst_p[0] = fg_r;
+		  dst_p[1] = fg_g;
+		  dst_p[2] = fg_b;
+		}
+	    }
+	    } else { dst_p[0] = 255; dst_p[1] = 0; dst_p[2] = 0; }
+	  dst_p += 3;
+	}
+      dst_linestart += dst_rowstride;
+    }
+}

art_rgb_rgba_affine.h

@@ -0,0 +1,51 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_RGB_RGBA_AFFINE_H__
+#define __ART_RGB_RGBA_AFFINE_H__
+
+/* This module handles compositing of affine-transformed rgba images
+   over rgb pixel buffers. */
+
+#ifdef LIBART_COMPILATION
+#include "art_filterlevel.h"
+#include "art_alphagamma.h"
+#else
+#include <libart_lgpl/art_filterlevel.h>
+#include <libart_lgpl/art_alphagamma.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void
+art_rgb_rgba_affine (art_u8 *dst,
+		     int x0, int y0, int x1, int y1, int dst_rowstride,
+		     const art_u8 *src,
+		     int src_width, int src_height, int src_rowstride,
+		     const double affine[6],
+		     ArtFilterLevel level,
+		     ArtAlphaGamma *alphagamma);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

art_rgb_svp.c

@@ -0,0 +1,457 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* Render a sorted vector path into an RGB buffer. */
+
+#include "config.h"
+#include "art_rgb_svp.h"
+
+#include "art_svp.h"
+#include "art_svp_render_aa.h"
+#include "art_rgb.h"
+
+typedef struct _ArtRgbSVPData ArtRgbSVPData;
+typedef struct _ArtRgbSVPAlphaData ArtRgbSVPAlphaData;
+
+struct _ArtRgbSVPData {
+  art_u32 rgbtab[256];
+  art_u8 *buf;
+  int rowstride;
+  int x0, x1;
+};
+
+struct _ArtRgbSVPAlphaData {
+  int alphatab[256];
+  art_u8 r, g, b, alpha;
+  art_u8 *buf;
+  int rowstride;
+  int x0, x1;
+};
+
+static void
+art_rgb_svp_callback (void *callback_data, int y,
+		      int start, ArtSVPRenderAAStep *steps, int n_steps)
+{
+  ArtRgbSVPData *data = (ArtRgbSVPData *)callback_data;
+  art_u8 *linebuf;
+  int run_x0, run_x1;
+  art_u32 running_sum = start;
+  art_u32 rgb;
+  int x0, x1;
+  int k;
+
+  linebuf = data->buf;
+  x0 = data->x0;
+  x1 = data->x1;
+
+  if (n_steps > 0)
+    {
+      run_x1 = steps[0].x;
+      if (run_x1 > x0)
+	{
+	  rgb = data->rgbtab[(running_sum >> 16) & 0xff];
+	  art_rgb_fill_run (linebuf,
+			    rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
+			    run_x1 - x0);
+	}
+
+      for (k = 0; k < n_steps - 1; k++)
+	{
+	  running_sum += steps[k].delta;
+	  run_x0 = run_x1;
+	  run_x1 = steps[k + 1].x;
+	  if (run_x1 > run_x0)
+	    {
+	      rgb = data->rgbtab[(running_sum >> 16) & 0xff];
+	      art_rgb_fill_run (linebuf + (run_x0 - x0) * 3,
+				rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
+				run_x1 - run_x0);
+	    }
+	}
+      running_sum += steps[k].delta;
+      if (x1 > run_x1)
+	{
+	  rgb = data->rgbtab[(running_sum >> 16) & 0xff];
+	  art_rgb_fill_run (linebuf + (run_x1 - x0) * 3,
+			    rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
+			    x1 - run_x1);
+	}
+    }
+  else
+    {
+      rgb = data->rgbtab[(running_sum >> 16) & 0xff];
+      art_rgb_fill_run (linebuf,
+			rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
+			x1 - x0);
+    }
+
+  data->buf += data->rowstride;
+}
+
+/* Render the vector path into the RGB buffer. */
+
+/**
+ * art_rgb_svp_aa: Render sorted vector path into RGB buffer.
+ * @svp: The source sorted vector path.
+ * @x0: Left coordinate of destination rectangle.
+ * @y0: Top coordinate of destination rectangle.
+ * @x1: Right coordinate of destination rectangle.
+ * @y1: Bottom coordinate of destination rectangle.
+ * @fg_color: Foreground color in 0xRRGGBB format.
+ * @bg_color: Background color in 0xRRGGBB format.
+ * @buf: Destination RGB buffer.
+ * @rowstride: Rowstride of @buf buffer.
+ * @alphagamma: #ArtAlphaGamma for gamma-correcting the rendering.
+ *
+ * Renders the shape specified with @svp into the @buf RGB buffer.
+ * @x1 - @x0 specifies the width, and @y1 - @y0 specifies the height,
+ * of the rectangle rendered. The new pixels are stored starting at
+ * the first byte of @buf. Thus, the @x0 and @y0 parameters specify
+ * an offset within @svp, and may be tweaked as a way of doing
+ * integer-pixel translations without fiddling with @svp itself.
+ *
+ * The @fg_color and @bg_color arguments specify the opaque colors to
+ * be used for rendering. For pixels of entirely 0 winding-number,
+ * @bg_color is used. For pixels of entirely 1 winding number,
+ * @fg_color is used. In between, the color is interpolated based on
+ * the fraction of the pixel with a winding number of 1. If
+ * @alphagamma is NULL, then linear interpolation (in pixel counts) is
+ * the default. Otherwise, the interpolation is as specified by
+ * @alphagamma.
+ **/
+void
+art_rgb_svp_aa (const ArtSVP *svp,
+		int x0, int y0, int x1, int y1,
+		art_u32 fg_color, art_u32 bg_color,
+		art_u8 *buf, int rowstride,
+		ArtAlphaGamma *alphagamma)
+{
+  ArtRgbSVPData data;
+
+  int r_fg, g_fg, b_fg;
+  int r_bg, g_bg, b_bg;
+  int r, g, b;
+  int dr, dg, db;
+  int i;
+
+  if (alphagamma == NULL)
+    {
+      r_fg = fg_color >> 16;
+      g_fg = (fg_color >> 8) & 0xff;
+      b_fg = fg_color & 0xff;
+
+      r_bg = bg_color >> 16;
+      g_bg = (bg_color >> 8) & 0xff;
+      b_bg = bg_color & 0xff;
+
+      r = (r_bg << 16) + 0x8000;
+      g = (g_bg << 16) + 0x8000;
+      b = (b_bg << 16) + 0x8000;
+      dr = ((r_fg - r_bg) << 16) / 255;
+      dg = ((g_fg - g_bg) << 16) / 255;
+      db = ((b_fg - b_bg) << 16) / 255;
+
+      for (i = 0; i < 256; i++)
+	{
+	  data.rgbtab[i] = (r & 0xff0000) | ((g & 0xff0000) >> 8) | (b >> 16);
+	  r += dr;
+	  g += dg;
+	  b += db;
+	}
+    }
+  else
+    {
+      int *table;
+      art_u8 *invtab;
+
+      table = alphagamma->table;
+
+      r_fg = table[fg_color >> 16];
+      g_fg = table[(fg_color >> 8) & 0xff];
+      b_fg = table[fg_color & 0xff];
+
+      r_bg = table[bg_color >> 16];
+      g_bg = table[(bg_color >> 8) & 0xff];
+      b_bg = table[bg_color & 0xff];
+
+      r = (r_bg << 16) + 0x8000;
+      g = (g_bg << 16) + 0x8000;
+      b = (b_bg << 16) + 0x8000;
+      dr = ((r_fg - r_bg) << 16) / 255;
+      dg = ((g_fg - g_bg) << 16) / 255;
+      db = ((b_fg - b_bg) << 16) / 255;
+
+      invtab = alphagamma->invtable;
+      for (i = 0; i < 256; i++)
+	{
+	  data.rgbtab[i] = (invtab[r >> 16] << 16) |
+	    (invtab[g >> 16] << 8) |
+	    invtab[b >> 16];
+	  r += dr;
+	  g += dg;
+	  b += db;
+	}
+    }
+  data.buf = buf;
+  data.rowstride = rowstride;
+  data.x0 = x0;
+  data.x1 = x1;
+  art_svp_render_aa (svp, x0, y0, x1, y1, art_rgb_svp_callback, &data);
+}
+
+static void
+art_rgb_svp_alpha_callback (void *callback_data, int y,
+			    int start, ArtSVPRenderAAStep *steps, int n_steps)
+{
+  ArtRgbSVPAlphaData *data = (ArtRgbSVPAlphaData *)callback_data;
+  art_u8 *linebuf;
+  int run_x0, run_x1;
+  art_u32 running_sum = start;
+  int x0, x1;
+  int k;
+  art_u8 r, g, b;
+  int *alphatab;
+  int alpha;
+
+  linebuf = data->buf;
+  x0 = data->x0;
+  x1 = data->x1;
+
+  r = data->r;
+  g = data->g;
+  b = data->b;
+  alphatab = data->alphatab;
+
+  if (n_steps > 0)
+    {
+      run_x1 = steps[0].x;
+      if (run_x1 > x0)
+	{
+	  alpha = (running_sum >> 16) & 0xff;
+	  if (alpha)
+	    art_rgb_run_alpha (linebuf,
+			       r, g, b, alphatab[alpha],
+			       run_x1 - x0);
+	}
+
+      for (k = 0; k < n_steps - 1; k++)
+	{
+	  running_sum += steps[k].delta;
+	  run_x0 = run_x1;
+	  run_x1 = steps[k + 1].x;
+	  if (run_x1 > run_x0)
+	    {
+	      alpha = (running_sum >> 16) & 0xff;
+	      if (alpha)
+		art_rgb_run_alpha (linebuf + (run_x0 - x0) * 3,
+				   r, g, b, alphatab[alpha],
+				   run_x1 - run_x0);
+	    }
+	}
+      running_sum += steps[k].delta;
+      if (x1 > run_x1)
+	{
+	  alpha = (running_sum >> 16) & 0xff;
+	  if (alpha)
+	    art_rgb_run_alpha (linebuf + (run_x1 - x0) * 3,
+			       r, g, b, alphatab[alpha],
+			       x1 - run_x1);
+	}
+    }
+  else
+    {
+      alpha = (running_sum >> 16) & 0xff;
+      if (alpha)
+	art_rgb_run_alpha (linebuf,
+			   r, g, b, alphatab[alpha],
+			   x1 - x0);
+    }
+
+  data->buf += data->rowstride;
+}
+
+static void
+art_rgb_svp_alpha_opaque_callback (void *callback_data, int y,
+				   int start,
+				   ArtSVPRenderAAStep *steps, int n_steps)
+{
+  ArtRgbSVPAlphaData *data = (ArtRgbSVPAlphaData *)callback_data;
+  art_u8 *linebuf;
+  int run_x0, run_x1;
+  art_u32 running_sum = start;
+  int x0, x1;
+  int k;
+  art_u8 r, g, b;
+  int *alphatab;
+  int alpha;
+
+  linebuf = data->buf;
+  x0 = data->x0;
+  x1 = data->x1;
+
+  r = data->r;
+  g = data->g;
+  b = data->b;
+  alphatab = data->alphatab;
+
+  if (n_steps > 0)
+    {
+      run_x1 = steps[0].x;
+      if (run_x1 > x0)
+	{
+	  alpha = running_sum >> 16;
+	  if (alpha)
+	    {
+	      if (alpha >= 255)
+		art_rgb_fill_run (linebuf,
+				  r, g, b,
+				  run_x1 - x0);
+	      else
+		art_rgb_run_alpha (linebuf,
+				   r, g, b, alphatab[alpha],
+				   run_x1 - x0);
+	    }
+	}
+
+      for (k = 0; k < n_steps - 1; k++)
+	{
+	  running_sum += steps[k].delta;
+	  run_x0 = run_x1;
+	  run_x1 = steps[k + 1].x;
+	  if (run_x1 > run_x0)
+	    {
+	      alpha = running_sum >> 16;
+	      if (alpha)
+		{
+		  if (alpha >= 255)
+		    art_rgb_fill_run (linebuf + (run_x0 - x0) * 3,
+				      r, g, b,
+				      run_x1 - run_x0);
+		  else
+		    art_rgb_run_alpha (linebuf + (run_x0 - x0) * 3,
+				       r, g, b, alphatab[alpha],
+				       run_x1 - run_x0);
+		}
+	    }
+	}
+      running_sum += steps[k].delta;
+      if (x1 > run_x1)
+	{
+	  alpha = running_sum >> 16;
+	  if (alpha)
+	    {
+	      if (alpha >= 255)
+		art_rgb_fill_run (linebuf + (run_x1 - x0) * 3,
+				  r, g, b,
+				  x1 - run_x1);
+	      else
+		art_rgb_run_alpha (linebuf + (run_x1 - x0) * 3,
+				   r, g, b, alphatab[alpha],
+				   x1 - run_x1);
+	    }
+	}
+    }
+  else
+    {
+      alpha = running_sum >> 16;
+      if (alpha)
+	{
+	  if (alpha >= 255)
+	    art_rgb_fill_run (linebuf,
+			      r, g, b,
+			      x1 - x0);
+	  else
+	    art_rgb_run_alpha (linebuf,
+			       r, g, b, alphatab[alpha],
+			       x1 - x0);
+	}
+    }
+
+  data->buf += data->rowstride;
+}
+
+/**
+ * art_rgb_svp_alpha: Alpha-composite sorted vector path over RGB buffer.
+ * @svp: The source sorted vector path.
+ * @x0: Left coordinate of destination rectangle.
+ * @y0: Top coordinate of destination rectangle.
+ * @x1: Right coordinate of destination rectangle.
+ * @y1: Bottom coordinate of destination rectangle.
+ * @rgba: Color in 0xRRGGBBAA format.
+ * @buf: Destination RGB buffer.
+ * @rowstride: Rowstride of @buf buffer.
+ * @alphagamma: #ArtAlphaGamma for gamma-correcting the compositing.
+ *
+ * Renders the shape specified with @svp over the @buf RGB buffer.
+ * @x1 - @x0 specifies the width, and @y1 - @y0 specifies the height,
+ * of the rectangle rendered. The new pixels are stored starting at
+ * the first byte of @buf. Thus, the @x0 and @y0 parameters specify
+ * an offset within @svp, and may be tweaked as a way of doing
+ * integer-pixel translations without fiddling with @svp itself.
+ *
+ * The @rgba argument specifies the color for the rendering. Pixels of
+ * entirely 0 winding number are left untouched. Pixels of entirely
+ * 1 winding number have the color @rgba composited over them (ie,
+ * are replaced by the red, green, blue components of @rgba if the alpha
+ * component is 0xff). Pixels of intermediate coverage are interpolated
+ * according to the rule in @alphagamma, or default to linear if
+ * @alphagamma is NULL.
+ **/
+void
+art_rgb_svp_alpha (const ArtSVP *svp,
+		   int x0, int y0, int x1, int y1,
+		   art_u32 rgba,
+		   art_u8 *buf, int rowstride,
+		   ArtAlphaGamma *alphagamma)
+{
+  ArtRgbSVPAlphaData data;
+  int r, g, b, alpha;
+  int i;
+  int a, da;
+
+  r = rgba >> 24;
+  g = (rgba >> 16) & 0xff;
+  b = (rgba >> 8) & 0xff;
+  alpha = rgba & 0xff;
+
+  data.r = r;
+  data.g = g;
+  data.b = b;
+  data.alpha = alpha;
+
+  a = 0x8000;
+  da = (alpha * 66051 + 0x80) >> 8; /* 66051 equals 2 ^ 32 / (255 * 255) */
+
+  for (i = 0; i < 256; i++)
+    {
+      data.alphatab[i] = a >> 16;
+      a += da;
+    }
+
+  data.buf = buf;
+  data.rowstride = rowstride;
+  data.x0 = x0;
+  data.x1 = x1;
+  if (alpha == 255)
+    art_svp_render_aa (svp, x0, y0, x1, y1, art_rgb_svp_alpha_opaque_callback,
+		       &data);
+  else
+    art_svp_render_aa (svp, x0, y0, x1, y1, art_rgb_svp_alpha_callback, &data);
+}
+

art_rgb_svp.h

@@ -0,0 +1,55 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_RGB_SVP_H__
+#define __ART_RGB_SVP_H__
+
+/* Render a sorted vector path into an RGB buffer. */
+
+#ifdef LIBART_COMPILATION
+#include "art_alphagamma.h"
+#include "art_svp.h"
+#else
+#include <libart_lgpl/art_alphagamma.h>
+#include <libart_lgpl/art_svp.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+void
+art_rgb_svp_aa (const ArtSVP *svp,
+		int x0, int y0, int x1, int y1,
+		art_u32 fg_color, art_u32 bg_color,
+		art_u8 *buf, int rowstride,
+		ArtAlphaGamma *alphagamma);
+
+void
+art_rgb_svp_alpha (const ArtSVP *svp,
+		   int x0, int y0, int x1, int y1,
+		   art_u32 rgba,
+		   art_u8 *buf, int rowstride,
+		   ArtAlphaGamma *alphagamma);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_RGB_SVP_H__ */

art_rgba.c

@@ -0,0 +1,258 @@
+/*
+ * art_rgba.c: Functions for manipulating RGBA pixel data.
+ *
+ * Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_rgba.h"
+
+#define ART_OPTIMIZE_SPACE
+
+#ifndef ART_OPTIMIZE_SPACE
+#include "art_rgba_table.c"
+#endif
+
+/**
+ * art_rgba_rgba_composite: Composite RGBA image over RGBA buffer.
+ * @dst: Destination RGBA buffer.
+ * @src: Source RGBA buffer.
+ * @n: Number of RGBA pixels to composite.
+ *
+ * Composites the RGBA pixels in @dst over the @src buffer.
+ **/
+void
+art_rgba_rgba_composite (art_u8 *dst, const art_u8 *src, int n)
+{
+  int i;
+#ifdef WORDS_BIGENDIAN
+  art_u32 src_rgba, dst_rgba;
+#else
+  art_u32 src_abgr, dst_abgr;
+#endif
+  art_u8 src_alpha, dst_alpha;
+
+  for (i = 0; i < n; i++)
+    {
+#ifdef WORDS_BIGENDIAN
+      src_rgba = ((art_u32 *)src)[i];
+      src_alpha = src_rgba & 0xff;
+#else
+      src_abgr = ((art_u32 *)src)[i];
+      src_alpha = (src_abgr >> 24) & 0xff;
+#endif
+      if (src_alpha)
+	{
+	  if (src_alpha == 0xff ||
+	      (
+#ifdef WORDS_BIGENDIAN
+	       dst_rgba = ((art_u32 *)dst)[i],
+	       dst_alpha = dst_rgba & 0xff,
+#else
+	       dst_abgr = ((art_u32 *)dst)[i],
+	       dst_alpha = (dst_abgr >> 24),
+#endif
+	       dst_alpha == 0))
+#ifdef WORDS_BIGENDIAN
+	    ((art_u32 *)dst)[i] = src_rgba;
+#else
+	    ((art_u32 *)dst)[i] = src_abgr;
+#endif
+	  else
+	    {
+	      int r, g, b, a;
+	      int src_r, src_g, src_b;
+	      int dst_r, dst_g, dst_b;
+	      int tmp;
+	      int c;
+
+#ifdef ART_OPTIMIZE_SPACE
+	      tmp = (255 - src_alpha) * (255 - dst_alpha) + 0x80;
+	      a = 255 - ((tmp + (tmp >> 8)) >> 8);
+	      c = ((src_alpha << 16) + (a >> 1)) / a;
+#else
+	      tmp = art_rgba_composite_table[(src_alpha << 8) + dst_alpha];
+	      c = tmp & 0x1ffff;
+	      a = tmp >> 24;
+#endif
+#ifdef WORDS_BIGENDIAN
+	      src_r = (src_rgba >> 24) & 0xff;
+	      src_g = (src_rgba >> 16) & 0xff;
+	      src_b = (src_rgba >> 8) & 0xff;
+	      dst_r = (dst_rgba >> 24) & 0xff;
+	      dst_g = (dst_rgba >> 16) & 0xff;
+	      dst_b = (dst_rgba >> 8) & 0xff;
+#else
+	      src_r = src_abgr & 0xff;
+	      src_g = (src_abgr >> 8) & 0xff;
+	      src_b = (src_abgr >> 16) & 0xff;
+	      dst_r = dst_abgr & 0xff;
+	      dst_g = (dst_abgr >> 8) & 0xff;
+	      dst_b = (dst_abgr >> 16) & 0xff;
+#endif
+	      r = dst_r + (((src_r - dst_r) * c + 0x8000) >> 16);
+	      g = dst_g + (((src_g - dst_g) * c + 0x8000) >> 16);
+	      b = dst_b + (((src_b - dst_b) * c + 0x8000) >> 16);
+#ifdef WORDS_BIGENDIAN
+	    ((art_u32 *)dst)[i] = (r << 24) | (g << 16) | (b << 8) | a;
+#else
+	    ((art_u32 *)dst)[i] = (a << 24) | (b << 16) | (g << 8) | r;
+#endif	      
+	    }
+	}
+#if 0
+      /* it's not clear to me this optimization really wins */
+      else
+	{
+	  /* skip over run of transparent pixels */
+	  for (; i < n - 1; i++)
+	    {
+#ifdef WORDS_BIGENDIAN
+	      src_rgba = ((art_u32 *)src)[i + 1];
+	      if (src_rgba & 0xff)
+		break;
+#else
+	      src_abgr = ((art_u32 *)src)[i + 1];
+	      if (src_abgr & 0xff000000)
+		break;
+#endif
+	    }
+	}
+#endif
+    }
+}
+
+/**
+ * art_rgba_fill_run: fill an RGBA buffer a solid RGB color.
+ * @buf: Buffer to fill.
+ * @r: Red, range 0..255.
+ * @g: Green, range 0..255.
+ * @b: Blue, range 0..255.
+ * @n: Number of RGB triples to fill.
+ *
+ * Fills a buffer with @n copies of the (@r, @g, @b) triple, solid
+ * alpha. Thus, locations @buf (inclusive) through @buf + 4 * @n
+ * (exclusive) are written.
+ **/
+void
+art_rgba_fill_run (art_u8 *buf, art_u8 r, art_u8 g, art_u8 b, int n)
+{
+  int i;
+#ifdef WORDS_BIGENDIAN
+  art_u32 src_rgba;
+#else
+  art_u32 src_abgr;
+#endif
+
+#ifdef WORDS_BIGENDIAN
+  src_rgba = (r << 24) | (g << 16) | (b << 8) | 255;
+#else
+  src_abgr = (255 << 24) | (b << 16) | (g << 8) | r;
+#endif
+  for (i = 0; i < n; i++)
+    {
+#ifdef WORDS_BIGENDIAN
+      ((art_u32 *)buf)[i] = src_rgba;
+#else
+      ((art_u32 *)buf)[i] = src_abgr;
+#endif
+    }    
+}
+
+/**
+ * art_rgba_run_alpha: Render semitransparent color over RGBA buffer.
+ * @buf: Buffer for rendering.
+ * @r: Red, range 0..255.
+ * @g: Green, range 0..255.
+ * @b: Blue, range 0..255.
+ * @alpha: Alpha, range 0..255.
+ * @n: Number of RGB triples to render.
+ *
+ * Renders a sequential run of solid (@r, @g, @b) color over @buf with
+ * opacity @alpha. Note that the range of @alpha is 0..255, in contrast
+ * to art_rgb_run_alpha, which has a range of 0..256.
+ **/
+void
+art_rgba_run_alpha (art_u8 *buf, art_u8 r, art_u8 g, art_u8 b, int alpha, int n)
+{
+  int i;
+#ifdef WORDS_BIGENDIAN
+  art_u32 src_rgba, dst_rgba;
+#else
+  art_u32 src_abgr, dst_abgr;
+#endif
+  art_u8 dst_alpha;
+  int a;
+  int dst_r, dst_g, dst_b;
+  int tmp;
+  int c;
+
+#ifdef WORDS_BIGENDIAN
+  src_rgba = (r << 24) | (g << 16) | (b << 8) | alpha;
+#else
+  src_abgr = (alpha << 24) | (b << 16) | (g << 8) | r;
+#endif
+  for (i = 0; i < n; i++)
+    {
+#ifdef WORDS_BIGENDIAN
+      dst_rgba = ((art_u32 *)buf)[i];
+      dst_alpha = dst_rgba & 0xff;
+#else
+      dst_abgr = ((art_u32 *)buf)[i];
+      dst_alpha = (dst_abgr >> 24) & 0xff;
+#endif
+      if (dst_alpha)
+	{
+#ifdef ART_OPTIMIZE_SPACE
+	  tmp = (255 - alpha) * (255 - dst_alpha) + 0x80;
+	  a = 255 - ((tmp + (tmp >> 8)) >> 8);
+	  c = ((alpha << 16) + (a >> 1)) / a;
+#else
+	  tmp = art_rgba_composite_table[(alpha << 8) + dst_alpha];
+	  c = tmp & 0x1ffff;
+	  a = tmp >> 24;
+#endif
+#ifdef WORDS_BIGENDIAN
+	  dst_r = (dst_rgba >> 24) & 0xff;
+	  dst_g = (dst_rgba >> 16) & 0xff;
+	  dst_b = (dst_rgba >> 8) & 0xff;
+#else
+	  dst_r = dst_abgr & 0xff;
+	  dst_g = (dst_abgr >> 8) & 0xff;
+	  dst_b = (dst_abgr >> 16) & 0xff;
+#endif
+	  dst_r += (((r - dst_r) * c + 0x8000) >> 16);
+	  dst_g += (((g - dst_g) * c + 0x8000) >> 16);
+	  dst_b += (((b - dst_b) * c + 0x8000) >> 16);
+#ifdef WORDS_BIGENDIAN
+	  ((art_u32 *)buf)[i] = (dst_r << 24) | (dst_g << 16) | (dst_b << 8) | a;
+#else
+	  ((art_u32 *)buf)[i] = (a << 24) | (dst_b << 16) | (dst_g << 8) | dst_r;
+#endif
+	}
+      else
+	{
+#ifdef WORDS_BIGENDIAN
+	  ((art_u32 *)buf)[i] = src_rgba;
+#else
+	  ((art_u32 *)buf)[i] = src_abgr;
+#endif
+	}
+    }
+}

art_rgba.h

@@ -0,0 +1,49 @@
+/*
+ * art_rgba.h: Functions for manipulating RGBA pixel data.
+ *
+ * Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_RGBA_H__
+#define __ART_RGBA_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_misc.h"
+#else
+#include <libart_lgpl/art_misc.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+void
+art_rgba_rgba_composite (art_u8 *dst, const art_u8 *src, int n);
+
+void
+art_rgba_fill_run (art_u8 *buf, art_u8 r, art_u8 g, art_u8 b, int n);
+
+void
+art_rgba_run_alpha (art_u8 *buf, art_u8 r, art_u8 g, art_u8 b, int alpha, int n);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif

art_svp.c

@@ -0,0 +1,152 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* Basic constructors and operations for sorted vector paths */
+
+#include "config.h"
+#include "art_svp.h"
+
+#include "art_misc.h"
+
+/* Add a new segment. The arguments can be zero and NULL if the caller
+   would rather fill them in later.
+
+   We also realloc one auxiliary array of ints of size n_segs if
+   desired.
+*/
+/**
+ * art_svp_add_segment: Add a segment to an #ArtSVP structure.
+ * @p_vp: Pointer to where the #ArtSVP structure is stored.
+ * @pn_segs_max: Pointer to the allocated size of *@p_vp.
+ * @pn_points_max: Pointer to where auxiliary array is stored.
+ * @n_points: Number of points for new segment.
+ * @dir: Direction for new segment; 0 is up, 1 is down.
+ * @points: Points for new segment.
+ * @bbox: Bounding box for new segment.
+ *
+ * Adds a new segment to an ArtSVP structure. This routine reallocates
+ * the structure if necessary, updating *@p_vp and *@pn_segs_max as
+ * necessary.
+ *
+ * The new segment is simply added after all other segments. Thus,
+ * this routine should be called in order consistent with the #ArtSVP
+ * sorting rules.
+ *
+ * If the @bbox argument is given, it is simply stored in the new
+ * segment. Otherwise (if it is NULL), the bounding box is computed
+ * from the @points given.
+ **/
+int
+art_svp_add_segment (ArtSVP **p_vp, int *pn_segs_max,
+		     int **pn_points_max,
+		     int n_points, int dir, ArtPoint *points,
+		     ArtDRect *bbox)
+{
+  int seg_num;
+  ArtSVP *svp;
+  ArtSVPSeg *seg;
+
+  svp = *p_vp;
+  seg_num = svp->n_segs++;
+  if (*pn_segs_max == seg_num)
+    {
+      *pn_segs_max <<= 1;
+      svp = (ArtSVP *)art_realloc (svp, sizeof(ArtSVP) +
+				   (*pn_segs_max - 1) * sizeof(ArtSVPSeg));
+      *p_vp = svp;
+      if (pn_points_max != NULL)
+	*pn_points_max = art_renew (*pn_points_max, int, *pn_segs_max);
+    }
+  seg = &svp->segs[seg_num];
+  seg->n_points = n_points;
+  seg->dir = dir;
+  seg->points = points;
+  if (bbox)
+    seg->bbox = *bbox;
+  else if (points)
+    {
+      double x_min, x_max;
+      int i;
+
+      x_min = x_max = points[0].x;
+      for (i = 1; i < n_points; i++)
+	{
+	  if (x_min > points[i].x)
+	    x_min = points[i].x;
+	  if (x_max < points[i].x)
+	    x_max = points[i].x;
+	}
+      seg->bbox.x0 = x_min;
+      seg->bbox.y0 = points[0].y;
+      
+      seg->bbox.x1 = x_max;
+      seg->bbox.y1 = points[n_points - 1].y;
+    }
+  return seg_num;
+}
+
+
+/**
+ * art_svp_free: Free an #ArtSVP structure.
+ * @svp: #ArtSVP to free.
+ * 
+ * Frees an #ArtSVP structure and all the segments in it.
+ **/
+void
+art_svp_free (ArtSVP *svp)
+{
+  int n_segs = svp->n_segs;
+  int i;
+
+  for (i = 0; i < n_segs; i++)
+    art_free (svp->segs[i].points);
+  art_free (svp);
+}
+
+#ifdef ART_USE_NEW_INTERSECTOR
+#define EPSILON 0
+#else
+#define EPSILON 1e-6
+#endif
+
+/**
+ * art_svp_seg_compare: Compare two segments of an svp.
+ * @seg1: First segment to compare.
+ * @seg2: Second segment to compare.
+ * 
+ * Compares two segments of an svp. Return 1 if @seg2 is below or to the
+ * right of @seg1, -1 otherwise.
+ **/
+int
+art_svp_seg_compare (const void *s1, const void *s2)
+{
+  const ArtSVPSeg *seg1 = s1;
+  const ArtSVPSeg *seg2 = s2;
+
+  if (seg1->points[0].y - EPSILON > seg2->points[0].y) return 1;
+  else if (seg1->points[0].y + EPSILON < seg2->points[0].y) return -1;
+  else if (seg1->points[0].x - EPSILON > seg2->points[0].x) return 1;
+  else if (seg1->points[0].x + EPSILON < seg2->points[0].x) return -1;
+  else if ((seg1->points[1].x - seg1->points[0].x) *
+	   (seg2->points[1].y - seg2->points[0].y) -
+	   (seg1->points[1].y - seg1->points[0].y) *
+	   (seg2->points[1].x - seg2->points[0].x) > 0) return 1;
+  else return -1;
+}
+

art_svp.h

@@ -0,0 +1,68 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_SVP_H__
+#define __ART_SVP_H__
+
+/* Basic data structures and constructors for sorted vector paths */
+
+#ifdef LIBART_COMPILATION
+#include "art_rect.h"
+#include "art_point.h"
+#else
+#include <libart_lgpl/art_rect.h>
+#include <libart_lgpl/art_point.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef struct _ArtSVP ArtSVP;
+typedef struct _ArtSVPSeg ArtSVPSeg;
+
+struct _ArtSVPSeg {
+  int n_points;
+  int dir; /* == 0 for "up", 1 for "down" */
+  ArtDRect bbox;
+  ArtPoint *points;
+};
+
+struct _ArtSVP {
+  int n_segs;
+  ArtSVPSeg segs[1];
+};
+
+int
+art_svp_add_segment (ArtSVP **p_vp, int *pn_segs_max,
+		     int **pn_points_max,
+		     int n_points, int dir, ArtPoint *points,
+		     ArtDRect *bbox);
+
+void
+art_svp_free (ArtSVP *svp);
+
+int
+art_svp_seg_compare (const void *s1, const void *s2);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_SVP_H__ */

art_svp_intersect.h

@@ -0,0 +1,70 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 2001 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_SVP_INTERSECT_H__
+#define __ART_SVP_INTERSECT_H__
+
+/* The funky new SVP intersector. */
+
+#ifdef LIBART_COMPILATION
+#include "art_svp.h"
+#else
+#include <libart_lgpl/art_svp.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#ifndef ART_WIND_RULE_DEFINED
+#define ART_WIND_RULE_DEFINED
+typedef enum {
+  ART_WIND_RULE_NONZERO,
+  ART_WIND_RULE_INTERSECT,
+  ART_WIND_RULE_ODDEVEN,
+  ART_WIND_RULE_POSITIVE
+} ArtWindRule;
+#endif
+
+typedef struct _ArtSvpWriter ArtSvpWriter;
+
+struct _ArtSvpWriter {
+  int (*add_segment) (ArtSvpWriter *self, int wind_left, int delta_wind,
+		      double x, double y);
+  void (*add_point) (ArtSvpWriter *self, int seg_id, double x, double y);
+  void (*close_segment) (ArtSvpWriter *self, int seg_id);
+};
+
+ArtSvpWriter *
+art_svp_writer_rewind_new (ArtWindRule rule);
+
+ArtSVP *
+art_svp_writer_rewind_reap (ArtSvpWriter *self);
+
+int
+art_svp_seg_compare (const void *s1, const void *s2);
+
+void
+art_svp_intersector (const ArtSVP *in, ArtSvpWriter *out);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_SVP_INTERSECT_H__ */

art_svp_ops.c

@@ -0,0 +1,401 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998-2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#define noVERBOSE
+
+/* Vector path set operations, over sorted vpaths. */
+
+#include "config.h"
+#include "art_svp_ops.h"
+
+#include "art_misc.h"
+
+#include "art_svp.h"
+#include "art_vpath.h"
+#include "art_svp_vpath.h"
+#include "art_svp.h"
+#ifdef ART_USE_NEW_INTERSECTOR
+#include "art_svp_intersect.h"
+#else
+#include "art_svp_wind.h"
+#endif
+#include "art_vpath_svp.h"
+
+/* Merge the segments of the two svp's. The resulting svp will share
+   segments with args passed in, so be super-careful with the
+   allocation.  */
+/**
+ * art_svp_merge: Merge the segments of two svp's.
+ * @svp1: One svp to merge.
+ * @svp2: The other svp to merge.
+ *
+ * Merges the segments of two SVP's into a new one. The resulting
+ * #ArtSVP data structure will share the segments of the argument
+ * svp's, so it is probably a good idea to free it shallowly,
+ * especially if the arguments will be freed with art_svp_free().
+ *
+ * Return value: The merged #ArtSVP.
+ **/
+static ArtSVP *
+art_svp_merge (const ArtSVP *svp1, const ArtSVP *svp2)
+{
+  ArtSVP *svp_new;
+  int ix;
+  int ix1, ix2;
+
+  svp_new = (ArtSVP *)art_alloc (sizeof(ArtSVP) +
+				 (svp1->n_segs + svp2->n_segs - 1) *
+				 sizeof(ArtSVPSeg));
+  ix1 = 0;
+  ix2 = 0;
+  for (ix = 0; ix < svp1->n_segs + svp2->n_segs; ix++)
+    {
+      if (ix1 < svp1->n_segs &&
+	  (ix2 == svp2->n_segs ||
+	   art_svp_seg_compare (&svp1->segs[ix1], &svp2->segs[ix2]) < 1))
+	svp_new->segs[ix] = svp1->segs[ix1++];
+      else
+	svp_new->segs[ix] = svp2->segs[ix2++];
+    }
+
+  svp_new->n_segs = ix;
+  return svp_new;
+}
+
+#ifdef VERBOSE
+
+#define XOFF 50
+#define YOFF 700
+
+static void
+print_ps_vpath (ArtVpath *vpath)
+{
+  int i;
+
+  printf ("gsave %d %d translate 1 -1 scale\n", XOFF, YOFF);
+  for (i = 0; vpath[i].code != ART_END; i++)
+    {
+      switch (vpath[i].code)
+	{
+	case ART_MOVETO:
+	  printf ("%g %g moveto\n", vpath[i].x, vpath[i].y);
+	  break;
+	case ART_LINETO:
+	  printf ("%g %g lineto\n", vpath[i].x, vpath[i].y);
+	  break;
+	default:
+	  break;
+	}
+    }
+  printf ("stroke grestore showpage\n");
+}
+
+#define DELT 4
+
+static void
+print_ps_svp (ArtSVP *vpath)
+{
+  int i, j;
+
+  printf ("%% begin\n");
+  for (i = 0; i < vpath->n_segs; i++)
+    {
+      printf ("%g setgray\n", vpath->segs[i].dir ? 0.7 : 0);
+      for (j = 0; j < vpath->segs[i].n_points; j++)
+	{
+	  printf ("%g %g %s\n",
+		  XOFF + vpath->segs[i].points[j].x,
+		  YOFF - vpath->segs[i].points[j].y,
+		  j ? "lineto" : "moveto");
+	}
+      printf ("%g %g moveto %g %g lineto %g %g lineto %g %g lineto stroke\n",
+	      XOFF + vpath->segs[i].points[0].x - DELT,
+	      YOFF - DELT - vpath->segs[i].points[0].y,
+	      XOFF + vpath->segs[i].points[0].x - DELT,
+	      YOFF - vpath->segs[i].points[0].y,
+	      XOFF + vpath->segs[i].points[0].x + DELT,
+	      YOFF - vpath->segs[i].points[0].y,
+	      XOFF + vpath->segs[i].points[0].x + DELT,
+	      YOFF - DELT - vpath->segs[i].points[0].y);
+      printf ("%g %g moveto %g %g lineto %g %g lineto %g %g lineto stroke\n",
+	      XOFF + vpath->segs[i].points[j - 1].x - DELT,
+	      YOFF + DELT - vpath->segs[i].points[j - 1].y,
+	      XOFF + vpath->segs[i].points[j - 1].x - DELT,
+	      YOFF - vpath->segs[i].points[j - 1].y,
+	      XOFF + vpath->segs[i].points[j - 1].x + DELT,
+	      YOFF - vpath->segs[i].points[j - 1].y,
+	      XOFF + vpath->segs[i].points[j - 1].x + DELT,
+	      YOFF + DELT - vpath->segs[i].points[j - 1].y);
+      printf ("stroke\n");
+    }
+
+  printf ("showpage\n");
+}
+#endif
+
+#ifndef ART_USE_NEW_INTERSECTOR
+static ArtSVP *
+art_svp_merge_perturbed (const ArtSVP *svp1, const ArtSVP *svp2)
+{
+  ArtVpath *vpath1, *vpath2;
+  ArtVpath *vpath1_p, *vpath2_p;
+  ArtSVP *svp1_p, *svp2_p;
+  ArtSVP *svp_new;
+
+  vpath1 = art_vpath_from_svp (svp1);
+  vpath1_p = art_vpath_perturb (vpath1);
+  art_free (vpath1);
+  svp1_p = art_svp_from_vpath (vpath1_p);
+  art_free (vpath1_p);
+
+  vpath2 = art_vpath_from_svp (svp2);
+  vpath2_p = art_vpath_perturb (vpath2);
+  art_free (vpath2);
+  svp2_p = art_svp_from_vpath (vpath2_p);
+  art_free (vpath2_p);
+
+  svp_new = art_svp_merge (svp1_p, svp2_p);
+#ifdef VERBOSE
+  print_ps_svp (svp1_p);
+  print_ps_svp (svp2_p);
+  print_ps_svp (svp_new);
+#endif
+  art_free (svp1_p);
+  art_free (svp2_p);
+
+  return svp_new;
+}
+#endif
+
+/* Compute the union of two vector paths.
+
+   Status of this routine:
+
+   Basic correctness: Seems to work.
+
+   Numerical stability: We cheat (adding random perturbation). Thus,
+   it seems very likely that no numerical stability problems will be
+   seen in practice.
+
+   Speed: Would be better if we didn't go to unsorted vector path
+   and back to add the perturbation.
+
+   Precision: The perturbation fuzzes the coordinates slightly. In
+   cases of butting segments, razor thin long holes may appear.
+
+*/
+/**
+ * art_svp_union: Compute the union of two sorted vector paths.
+ * @svp1: One sorted vector path.
+ * @svp2: The other sorted vector path.
+ *
+ * Computes the union of the two argument svp's. Given two svp's with
+ * winding numbers of 0 and 1 everywhere, the resulting winding number
+ * will be 1 where either (or both) of the argument svp's has a
+ * winding number 1, 0 otherwise. The result is newly allocated.
+ *
+ * Currently, this routine has accuracy problems pending the
+ * implementation of the new intersector.
+ *
+ * Return value: The union of @svp1 and @svp2.
+ **/
+ArtSVP *
+art_svp_union (const ArtSVP *svp1, const ArtSVP *svp2)
+{
+#ifdef ART_USE_NEW_INTERSECTOR 
+  ArtSVP *svp3, *svp_new;
+  ArtSvpWriter *swr;
+
+  svp3 = art_svp_merge (svp1, svp2);
+  swr = art_svp_writer_rewind_new (ART_WIND_RULE_POSITIVE);
+  art_svp_intersector (svp3, swr);
+  svp_new = art_svp_writer_rewind_reap (swr);
+  art_free (svp3); /* shallow free because svp3 contains shared segments */
+
+  return svp_new;
+#else
+  ArtSVP *svp3, *svp4, *svp_new;
+
+  svp3 = art_svp_merge_perturbed (svp1, svp2);
+  svp4 = art_svp_uncross (svp3);
+  art_svp_free (svp3);
+
+  svp_new = art_svp_rewind_uncrossed (svp4, ART_WIND_RULE_POSITIVE);
+#ifdef VERBOSE
+  print_ps_svp (svp4);
+  print_ps_svp (svp_new);
+#endif
+  art_svp_free (svp4);
+  return svp_new;
+#endif
+}
+
+/* Compute the intersection of two vector paths.
+
+   Status of this routine:
+
+   Basic correctness: Seems to work.
+
+   Numerical stability: We cheat (adding random perturbation). Thus,
+   it seems very likely that no numerical stability problems will be
+   seen in practice.
+
+   Speed: Would be better if we didn't go to unsorted vector path
+   and back to add the perturbation.
+
+   Precision: The perturbation fuzzes the coordinates slightly. In
+   cases of butting segments, razor thin long isolated segments may
+   appear.
+
+*/
+
+/**
+ * art_svp_intersect: Compute the intersection of two sorted vector paths.
+ * @svp1: One sorted vector path.
+ * @svp2: The other sorted vector path.
+ *
+ * Computes the intersection of the two argument svp's. Given two
+ * svp's with winding numbers of 0 and 1 everywhere, the resulting
+ * winding number will be 1 where both of the argument svp's has a
+ * winding number 1, 0 otherwise. The result is newly allocated.
+ *
+ * Currently, this routine has accuracy problems pending the
+ * implementation of the new intersector.
+ *
+ * Return value: The intersection of @svp1 and @svp2.
+ **/
+ArtSVP *
+art_svp_intersect (const ArtSVP *svp1, const ArtSVP *svp2)
+{
+#ifdef ART_USE_NEW_INTERSECTOR 
+  ArtSVP *svp3, *svp_new;
+  ArtSvpWriter *swr;
+
+  svp3 = art_svp_merge (svp1, svp2);
+  swr = art_svp_writer_rewind_new (ART_WIND_RULE_INTERSECT);
+  art_svp_intersector (svp3, swr);
+  svp_new = art_svp_writer_rewind_reap (swr);
+  art_free (svp3); /* shallow free because svp3 contains shared segments */
+
+  return svp_new;
+#else
+  ArtSVP *svp3, *svp4, *svp_new;
+
+  svp3 = art_svp_merge_perturbed (svp1, svp2);
+  svp4 = art_svp_uncross (svp3);
+  art_svp_free (svp3);
+
+  svp_new = art_svp_rewind_uncrossed (svp4, ART_WIND_RULE_INTERSECT);
+  art_svp_free (svp4);
+  return svp_new;
+#endif
+}
+
+/* Compute the symmetric difference of two vector paths.
+
+   Status of this routine:
+
+   Basic correctness: Seems to work.
+
+   Numerical stability: We cheat (adding random perturbation). Thus,
+   it seems very likely that no numerical stability problems will be
+   seen in practice.
+
+   Speed: We could do a lot better by scanning through the svp
+   representations and culling out any segments that are exactly
+   identical. It would also be better if we didn't go to unsorted
+   vector path and back to add the perturbation.
+
+   Precision: Awful. In the case of inputs which are similar (the
+   common case for canvas display), the entire outline is "hairy." In
+   addition, the perturbation fuzzes the coordinates slightly. It can
+   be used as a conservative approximation.
+
+*/
+
+/**
+ * art_svp_diff: Compute the symmetric difference of two sorted vector paths.
+ * @svp1: One sorted vector path.
+ * @svp2: The other sorted vector path.
+ *
+ * Computes the symmetric of the two argument svp's. Given two svp's
+ * with winding numbers of 0 and 1 everywhere, the resulting winding
+ * number will be 1 where either, but not both, of the argument svp's
+ * has a winding number 1, 0 otherwise. The result is newly allocated.
+ *
+ * Currently, this routine has accuracy problems pending the
+ * implementation of the new intersector.
+ *
+ * Return value: The symmetric difference of @svp1 and @svp2.
+ **/
+ArtSVP *
+art_svp_diff (const ArtSVP *svp1, const ArtSVP *svp2)
+{
+#ifdef ART_USE_NEW_INTERSECTOR 
+  ArtSVP *svp3, *svp_new;
+  ArtSvpWriter *swr;
+
+  svp3 = art_svp_merge (svp1, svp2);
+  swr = art_svp_writer_rewind_new (ART_WIND_RULE_ODDEVEN);
+  art_svp_intersector (svp3, swr);
+  svp_new = art_svp_writer_rewind_reap (swr);
+  art_free (svp3); /* shallow free because svp3 contains shared segments */
+
+  return svp_new;
+#else
+  ArtSVP *svp3, *svp4, *svp_new;
+
+  svp3 = art_svp_merge_perturbed (svp1, svp2);
+  svp4 = art_svp_uncross (svp3);
+  art_svp_free (svp3);
+
+  svp_new = art_svp_rewind_uncrossed (svp4, ART_WIND_RULE_ODDEVEN);
+  art_svp_free (svp4);
+  return svp_new;
+#endif
+}
+
+#ifdef ART_USE_NEW_INTERSECTOR 
+ArtSVP *
+art_svp_minus (const ArtSVP *svp1, const ArtSVP *svp2)
+{
+  ArtSVP *svp2_mod;
+  ArtSVP *svp3, *svp_new;
+  ArtSvpWriter *swr;
+  int i;
+
+  svp2_mod = (ArtSVP *) svp2; /* get rid of the const for a while */
+
+  /* First invert svp2 to "turn it inside out" */
+  for (i = 0; i < svp2_mod->n_segs; i++)
+    svp2_mod->segs[i].dir = !svp2_mod->segs[i].dir;
+
+  svp3 = art_svp_merge (svp1, svp2_mod);
+  swr = art_svp_writer_rewind_new (ART_WIND_RULE_POSITIVE);
+  art_svp_intersector (svp3, swr);
+  svp_new = art_svp_writer_rewind_reap (swr);
+  art_free (svp3); /* shallow free because svp3 contains shared segments */
+
+  /* Flip svp2 back to its original state */
+  for (i = 0; i < svp2_mod->n_segs; i++)
+    svp2_mod->segs[i].dir = !svp2_mod->segs[i].dir;
+
+  return svp_new;
+}
+#endif /* ART_USE_NEW_INTERSECTOR */

art_svp_ops.h

@@ -0,0 +1,44 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_SVP_OPS_H__
+#define __ART_SVP_OPS_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_svp.h"
+#else
+#include <libart_lgpl/art_svp.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* Vector path set operations, over sorted vpaths. */
+
+ArtSVP *art_svp_union (const ArtSVP *svp1, const ArtSVP *svp2);
+ArtSVP *art_svp_intersect (const ArtSVP *svp1, const ArtSVP *svp2);
+ArtSVP *art_svp_diff (const ArtSVP *svp1, const ArtSVP *svp2);
+ArtSVP *art_svp_minus (const ArtSVP *svp1, const ArtSVP *svp2);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_SVP_OPS_H__ */

art_svp_point.c

@@ -0,0 +1,144 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1999 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_svp_point.h"
+
+#include <math.h>
+#include "art_misc.h"
+
+#include "art_svp.h"
+
+/* Determine whether a point is inside, or near, an svp. */
+
+/* return winding number of point wrt svp */
+/**
+ * art_svp_point_wind: Determine winding number of a point with respect to svp.
+ * @svp: The svp.
+ * @x: The X coordinate of the point.
+ * @y: The Y coordinate of the point.
+ *
+ * Determine the winding number of the point @x, @y with respect to @svp.
+ *
+ * Return value: the winding number.
+ **/
+int
+art_svp_point_wind (ArtSVP *svp, double x, double y)
+{
+  int i, j;
+  int wind = 0;
+
+  for (i = 0; i < svp->n_segs; i++)
+    {
+      ArtSVPSeg *seg = &svp->segs[i];
+
+      if (seg->bbox.y0 > y)
+	break;
+
+      if (seg->bbox.y1 > y)
+	{
+	  if (seg->bbox.x1 < x)
+	    wind += seg->dir ? 1 : -1;
+	  else if (seg->bbox.x0 <= x)
+	    {
+	      double x0, y0, x1, y1, dx, dy;
+
+	      for (j = 0; j < seg->n_points - 1; j++)
+		{
+		  if (seg->points[j + 1].y > y)
+		    break;
+		}
+	      x0 = seg->points[j].x;
+	      y0 = seg->points[j].y;
+	      x1 = seg->points[j + 1].x;
+	      y1 = seg->points[j + 1].y;
+
+	      dx = x1 - x0;
+	      dy = y1 - y0;
+	      if ((x - x0) * dy > (y - y0) * dx)
+		wind += seg->dir ? 1 : -1;
+	    }
+	}
+    }
+
+  return wind;
+}
+
+/**
+ * art_svp_point_dist: Determine distance between point and svp.
+ * @svp: The svp.
+ * @x: The X coordinate of the point.
+ * @y: The Y coordinate of the point.
+ *
+ * Determines the distance of the point @x, @y to the closest edge in
+ * @svp. A large number is returned if @svp is empty.
+ *
+ * Return value: the distance.
+ **/
+double
+art_svp_point_dist (ArtSVP *svp, double x, double y)
+{
+  int i, j;
+  double dist_sq;
+  double best_sq = -1;
+
+  for (i = 0; i < svp->n_segs; i++)
+    {
+      ArtSVPSeg *seg = &svp->segs[i];
+      for (j = 0; j < seg->n_points - 1; j++)
+	{
+	  double x0 = seg->points[j].x;
+	  double y0 = seg->points[j].y;
+	  double x1 = seg->points[j + 1].x;
+	  double y1 = seg->points[j + 1].y;
+
+	  double dx = x1 - x0;
+	  double dy = y1 - y0;
+
+	  double dxx0 = x - x0;
+	  double dyy0 = y - y0;
+
+	  double dot = dxx0 * dx + dyy0 * dy;
+
+	  if (dot < 0)
+	    dist_sq = dxx0 * dxx0 + dyy0 * dyy0;
+	  else
+	    {
+	      double rr = dx * dx + dy * dy;
+
+	      if (dot > rr)
+		dist_sq = (x - x1) * (x - x1) + (y - y1) * (y - y1);
+	      else
+		{
+		  double perp = (y - y0) * dx - (x - x0) * dy;
+
+		  dist_sq = perp * perp / rr;
+		}
+	    }
+	  if (best_sq < 0 || dist_sq < best_sq)
+	    best_sq = dist_sq;
+	}
+    }
+
+  if (best_sq >= 0)
+    return sqrt (best_sq);
+  else
+    return 1e12;
+}
+

art_svp_point.h

@@ -0,0 +1,49 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1999 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_SVP_POINT_H__
+#define __ART_SVP_POINT_H__
+
+/* Determine whether a point is inside, or near, an svp. */
+
+#ifdef LIBART_COMPILATION
+#include "art_svp.h"
+#else
+#include <libart_lgpl/art_svp.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+int
+art_svp_point_wind (ArtSVP *svp, double x, double y);
+
+double
+art_svp_point_dist (ArtSVP *svp, double x, double y);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_SVP_H__ */
+
+
+
+

art_svp_render_aa.c

@@ -0,0 +1,463 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998-2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* The spiffy antialiased renderer for sorted vector paths. */
+
+#include "config.h"
+#include "art_svp_render_aa.h"
+
+#include <math.h>
+#include <string.h> /* for memmove */
+#include "art_misc.h"
+
+#include "art_rect.h"
+#include "art_svp.h"
+
+#include <stdio.h>
+
+typedef double artfloat;
+
+struct _ArtSVPRenderAAIter {
+  const ArtSVP *svp;
+  int x0, x1;
+  int y;
+  int seg_ix;
+
+  int *active_segs;
+  int n_active_segs;
+  int *cursor;
+  artfloat *seg_x;
+  artfloat *seg_dx;
+
+  ArtSVPRenderAAStep *steps;
+};
+
+static void
+art_svp_render_insert_active (int i, int *active_segs, int n_active_segs,
+			      artfloat *seg_x, artfloat *seg_dx)
+{
+  int j;
+  artfloat x;
+  int tmp1, tmp2;
+
+  /* this is a cheap hack to get ^'s sorted correctly */
+  x = seg_x[i] + 0.001 * seg_dx[i];
+  for (j = 0; j < n_active_segs && seg_x[active_segs[j]] < x; j++);
+
+  tmp1 = i;
+  while (j < n_active_segs)
+    {
+      tmp2 = active_segs[j];
+      active_segs[j] = tmp1;
+      tmp1 = tmp2;
+      j++;
+    }
+  active_segs[j] = tmp1;
+}
+
+static void
+art_svp_render_delete_active (int *active_segs, int j, int n_active_segs)
+{
+  int k;
+
+  for (k = j; k < n_active_segs; k++)
+    active_segs[k] = active_segs[k + 1];
+}
+
+#define EPSILON 1e-6
+
+/* Render the sorted vector path in the given rectangle, antialiased.
+
+   This interface uses a callback for the actual pixel rendering. The
+   callback is called y1 - y0 times (once for each scan line). The y
+   coordinate is given as an argument for convenience (it could be
+   stored in the callback's private data and incremented on each
+   call).
+
+   The rendered polygon is represented in a semi-runlength format: a
+   start value and a sequence of "steps". Each step has an x
+   coordinate and a value delta. The resulting value at position x is
+   equal to the sum of the start value and all step delta values for
+   which the step x coordinate is less than or equal to x. An
+   efficient algorithm will traverse the steps left to right, keeping
+   a running sum.
+
+   All x coordinates in the steps are guaranteed to be x0 <= x < x1.
+   (This guarantee is a change from the gfonted vpaar renderer, and is
+   designed to simplify the callback).
+
+   There is now a further guarantee that no two steps will have the
+   same x value. This may allow for further speedup and simplification
+   of renderers.
+
+   The value 0x8000 represents 0% coverage by the polygon, while
+   0xff8000 represents 100% coverage. This format is designed so that
+   >> 16 results in a standard 0x00..0xff value range, with nice
+   rounding.
+
+   Status of this routine:
+
+   Basic correctness: OK
+
+   Numerical stability: pretty good, although probably not
+   bulletproof.
+
+   Speed: Needs more aggressive culling of bounding boxes.  Can
+   probably speed up the [x0,x1) clipping of step values.  Can do more
+   of the step calculation in fixed point.
+
+   Precision: No known problems, although it should be tested
+   thoroughly, especially for symmetry.
+
+*/
+
+ArtSVPRenderAAIter *
+art_svp_render_aa_iter (const ArtSVP *svp,
+			int x0, int y0, int x1, int y1)
+{
+  ArtSVPRenderAAIter *iter = art_new (ArtSVPRenderAAIter, 1);
+
+  iter->svp = svp;
+  iter->y = y0;
+  iter->x0 = x0;
+  iter->x1 = x1;
+  iter->seg_ix = 0;
+
+  iter->active_segs = art_new (int, svp->n_segs);
+  iter->cursor = art_new (int, svp->n_segs);
+  iter->seg_x = art_new (artfloat, svp->n_segs);
+  iter->seg_dx = art_new (artfloat, svp->n_segs);
+  iter->steps = art_new (ArtSVPRenderAAStep, x1 - x0);
+  iter->n_active_segs = 0;
+
+  return iter;
+}
+
+#define ADD_STEP(xpos, xdelta)                          \
+  /* stereotype code fragment for adding a step */      \
+  if (n_steps == 0 || steps[n_steps - 1].x < xpos)      \
+    {                                                   \
+      sx = n_steps;                                     \
+      steps[sx].x = xpos;                               \
+      steps[sx].delta = xdelta;                         \
+      n_steps++;                                        \
+    }                                                   \
+  else                                                  \
+    {                                                   \
+      for (sx = n_steps; sx > 0; sx--)                  \
+	{                                               \
+	  if (steps[sx - 1].x == xpos)                  \
+	    {                                           \
+	      steps[sx - 1].delta += xdelta;            \
+	      sx = n_steps;                             \
+	      break;                                    \
+	    }                                           \
+	  else if (steps[sx - 1].x < xpos)              \
+	    {                                           \
+	      break;                                    \
+	    }                                           \
+	}                                               \
+      if (sx < n_steps)                                 \
+	{                                               \
+	  memmove (&steps[sx + 1], &steps[sx],          \
+		   (n_steps - sx) * sizeof(steps[0]));  \
+	  steps[sx].x = xpos;                           \
+	  steps[sx].delta = xdelta;                     \
+	  n_steps++;                                    \
+	}                                               \
+    }
+
+void
+art_svp_render_aa_iter_step (ArtSVPRenderAAIter *iter, int *p_start,
+			     ArtSVPRenderAAStep **p_steps, int *p_n_steps)
+{
+  const ArtSVP *svp = iter->svp;
+  int *active_segs = iter->active_segs;
+  int n_active_segs = iter->n_active_segs;
+  int *cursor = iter->cursor;
+  artfloat *seg_x = iter->seg_x;
+  artfloat *seg_dx = iter->seg_dx;
+  int i = iter->seg_ix;
+  int j;
+  int x0 = iter->x0;
+  int x1 = iter->x1;
+  int y = iter->y;
+  int seg_index;
+
+  int x;
+  ArtSVPRenderAAStep *steps = iter->steps;
+  int n_steps;
+  artfloat y_top, y_bot;
+  artfloat x_top, x_bot;
+  artfloat x_min, x_max;
+  int ix_min, ix_max;
+  artfloat delta; /* delta should be int too? */
+  int last, this;
+  int xdelta;
+  artfloat rslope, drslope;
+  int start;
+  const ArtSVPSeg *seg;
+  int curs;
+  artfloat dy;
+
+  int sx;
+  
+  /* insert new active segments */
+  for (; i < svp->n_segs && svp->segs[i].bbox.y0 < y + 1; i++)
+    {
+      if (svp->segs[i].bbox.y1 > y &&
+	  svp->segs[i].bbox.x0 < x1)
+	{
+	  seg = &svp->segs[i];
+	  /* move cursor to topmost vector which overlaps [y,y+1) */
+	  for (curs = 0; seg->points[curs + 1].y < y; curs++);
+	  cursor[i] = curs;
+	  dy = seg->points[curs + 1].y - seg->points[curs].y;
+	  if (fabs (dy) >= EPSILON)
+	    seg_dx[i] = (seg->points[curs + 1].x - seg->points[curs].x) /
+	      dy;
+	  else
+	    seg_dx[i] = 1e12;
+	  seg_x[i] = seg->points[curs].x +
+	    (y - seg->points[curs].y) * seg_dx[i];
+	  art_svp_render_insert_active (i, active_segs, n_active_segs++,
+					seg_x, seg_dx);
+	}
+    }
+
+  n_steps = 0;
+
+  /* render the runlengths, advancing and deleting as we go */
+  start = 0x8000;
+
+  for (j = 0; j < n_active_segs; j++)
+    {
+      seg_index = active_segs[j];
+      seg = &svp->segs[seg_index];
+      curs = cursor[seg_index];
+      while (curs != seg->n_points - 1 &&
+	     seg->points[curs].y < y + 1)
+	{
+	  y_top = y;
+	  if (y_top < seg->points[curs].y)
+	    y_top = seg->points[curs].y;
+	  y_bot = y + 1;
+	  if (y_bot > seg->points[curs + 1].y)
+	    y_bot = seg->points[curs + 1].y;
+	  if (y_top != y_bot) {
+	    delta = (seg->dir ? 16711680.0 : -16711680.0) *
+	      (y_bot - y_top);
+	    x_top = seg_x[seg_index] + (y_top - y) * seg_dx[seg_index];
+	    x_bot = seg_x[seg_index] + (y_bot - y) * seg_dx[seg_index];
+	    if (x_top < x_bot)
+	      {
+		x_min = x_top;
+		x_max = x_bot;
+	      }
+	    else
+	      {
+		x_min = x_bot;
+		x_max = x_top;
+	      }
+	    ix_min = floor (x_min);
+	    ix_max = floor (x_max);
+	    if (ix_min >= x1)
+	      {
+		/* skip; it starts to the right of the render region */
+	      }
+	    else if (ix_max < x0)
+	      /* it ends to the left of the render region */
+	      start += delta;
+	    else if (ix_min == ix_max)
+	      {
+		/* case 1, antialias a single pixel */
+		xdelta = (ix_min + 1 - (x_min + x_max) * 0.5) * delta;
+
+		ADD_STEP(ix_min, xdelta)
+
+		if (ix_min + 1 < x1)
+		  {
+		    xdelta = delta - xdelta;
+
+		    ADD_STEP(ix_min + 1, xdelta)
+		  }
+	      }
+	    else
+	      {
+		/* case 2, antialias a run */
+		rslope = 1.0 / fabs (seg_dx[seg_index]);
+		drslope = delta * rslope;
+		last =
+		  drslope * 0.5 *
+		  (ix_min + 1 - x_min) * (ix_min + 1 - x_min);
+		xdelta = last;
+		if (ix_min >= x0)
+		  {
+		    ADD_STEP(ix_min, xdelta)
+		    
+		    x = ix_min + 1;
+		  }
+		else
+		  {
+		    start += last;
+		    x = x0;
+		  }
+		if (ix_max > x1)
+		  ix_max = x1;
+		for (; x < ix_max; x++)
+		  {
+		    this = (seg->dir ? 16711680.0 : -16711680.0) * rslope *
+		      (x + 0.5 - x_min);
+		    xdelta = this - last;
+		    last = this;
+
+		    ADD_STEP(x, xdelta)
+		  }
+		if (x < x1)
+		  {
+		    this =
+		      delta * (1 - 0.5 *
+			       (x_max - ix_max) * (x_max - ix_max) *
+			       rslope);
+		    xdelta = this - last;
+		    last = this;
+
+		    ADD_STEP(x, xdelta)
+		    
+		    if (x + 1 < x1)
+		      {
+			xdelta = delta - last;
+
+			ADD_STEP(x + 1, xdelta)
+		      }
+		  }
+	      }
+	  }
+	  curs++;
+	  if (curs != seg->n_points - 1 &&
+	      seg->points[curs].y < y + 1)
+	    {
+	      dy = seg->points[curs + 1].y - seg->points[curs].y;
+	      if (fabs (dy) >= EPSILON)
+		seg_dx[seg_index] = (seg->points[curs + 1].x -
+				     seg->points[curs].x) / dy;
+	      else
+		seg_dx[seg_index] = 1e12;
+	      seg_x[seg_index] = seg->points[curs].x +
+		(y - seg->points[curs].y) * seg_dx[seg_index];
+	    }
+	  /* break here, instead of duplicating predicate in while? */
+	}
+      if (seg->points[curs].y >= y + 1)
+	{
+	  curs--;
+	  cursor[seg_index] = curs;
+	  seg_x[seg_index] += seg_dx[seg_index];
+	}
+      else
+	{
+	  art_svp_render_delete_active (active_segs, j--,
+					--n_active_segs);
+	}
+    }
+
+  *p_start = start;
+  *p_steps = steps;
+  *p_n_steps = n_steps;
+
+  iter->seg_ix = i;
+  iter->n_active_segs = n_active_segs;
+  iter->y++;
+}
+
+void
+art_svp_render_aa_iter_done (ArtSVPRenderAAIter *iter)
+{
+  art_free (iter->steps);
+
+  art_free (iter->seg_dx);
+  art_free (iter->seg_x);
+  art_free (iter->cursor);
+  art_free (iter->active_segs);
+  art_free (iter);
+}
+
+/**
+ * art_svp_render_aa: Render SVP antialiased.
+ * @svp: The #ArtSVP to render.
+ * @x0: Left coordinate of destination rectangle.
+ * @y0: Top coordinate of destination rectangle.
+ * @x1: Right coordinate of destination rectangle.
+ * @y1: Bottom coordinate of destination rectangle.
+ * @callback: The callback which actually paints the pixels.
+ * @callback_data: Private data for @callback.
+ *
+ * Renders the sorted vector path in the given rectangle, antialiased.
+ *
+ * This interface uses a callback for the actual pixel rendering. The
+ * callback is called @y1 - @y0 times (once for each scan line). The y
+ * coordinate is given as an argument for convenience (it could be
+ * stored in the callback's private data and incremented on each
+ * call).
+ *
+ * The rendered polygon is represented in a semi-runlength format: a
+ * start value and a sequence of "steps". Each step has an x
+ * coordinate and a value delta. The resulting value at position x is
+ * equal to the sum of the start value and all step delta values for
+ * which the step x coordinate is less than or equal to x. An
+ * efficient algorithm will traverse the steps left to right, keeping
+ * a running sum.
+ *
+ * All x coordinates in the steps are guaranteed to be @x0 <= x < @x1.
+ * (This guarantee is a change from the gfonted vpaar renderer from
+ * which this routine is derived, and is designed to simplify the
+ * callback).
+ *
+ * The value 0x8000 represents 0% coverage by the polygon, while
+ * 0xff8000 represents 100% coverage. This format is designed so that
+ * >> 16 results in a standard 0x00..0xff value range, with nice
+ * rounding.
+ * 
+ **/
+void
+art_svp_render_aa (const ArtSVP *svp,
+		   int x0, int y0, int x1, int y1,
+		   void (*callback) (void *callback_data,
+				     int y,
+				     int start,
+				     ArtSVPRenderAAStep *steps, int n_steps),
+		   void *callback_data)
+{
+  ArtSVPRenderAAIter *iter;
+  int y;
+  int start;
+  ArtSVPRenderAAStep *steps;
+  int n_steps;
+
+  iter = art_svp_render_aa_iter (svp, x0, y0, x1, y1);
+
+
+  for (y = y0; y < y1; y++)
+    {
+      art_svp_render_aa_iter_step (iter, &start, &steps, &n_steps);
+      (*callback) (callback_data, y, start, steps, n_steps);
+    }
+
+  art_svp_render_aa_iter_done (iter);
+}

art_svp_render_aa.h

@@ -0,0 +1,67 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_SVP_RENDER_AA_H__
+#define __ART_SVP_RENDER_AA_H__
+
+/* The spiffy antialiased renderer for sorted vector paths. */
+
+#ifdef LIBART_COMPILATION
+#include "art_svp.h"
+#else
+#include <libart_lgpl/art_svp.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef struct _ArtSVPRenderAAStep ArtSVPRenderAAStep;
+typedef struct _ArtSVPRenderAAIter ArtSVPRenderAAIter;
+
+struct _ArtSVPRenderAAStep {
+  int x;
+  int delta; /* stored with 16 fractional bits */
+};
+
+ArtSVPRenderAAIter *
+art_svp_render_aa_iter (const ArtSVP *svp,
+			int x0, int y0, int x1, int y1);
+
+void
+art_svp_render_aa_iter_step (ArtSVPRenderAAIter *iter, int *p_start,
+			     ArtSVPRenderAAStep **p_steps, int *p_n_steps);
+
+void
+art_svp_render_aa_iter_done (ArtSVPRenderAAIter *iter);
+
+void
+art_svp_render_aa (const ArtSVP *svp,
+		   int x0, int y0, int x1, int y1,
+		   void (*callback) (void *callback_data,
+				     int y,
+				     int start,
+				     ArtSVPRenderAAStep *steps, int n_steps),
+		   void *callback_data);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_SVP_RENDER_AA_H__ */

art_svp_vpath.c

@@ -0,0 +1,215 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998-2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* Sort vector paths into sorted vector paths */
+
+#include "config.h"
+#include "art_svp_vpath.h"
+
+#include <stdlib.h>
+#include <math.h>
+
+#include "art_misc.h"
+
+#include "art_vpath.h"
+#include "art_svp.h"
+
+
+/* reverse a list of points in place */
+static void
+reverse_points (ArtPoint *points, int n_points)
+{
+  int i;
+  ArtPoint tmp_p;
+
+  for (i = 0; i < (n_points >> 1); i++)
+    {
+      tmp_p = points[i];
+      points[i] = points[n_points - (i + 1)];
+      points[n_points - (i + 1)] = tmp_p;
+    }
+}
+
+/**
+ * art_svp_from_vpath: Convert a vpath to a sorted vector path.
+ * @vpath: #ArtVPath to convert.
+ *
+ * Converts a vector path into sorted vector path form. The svp form is
+ * more efficient for rendering and other vector operations.
+ *
+ * Basically, the implementation is to traverse the vector path,
+ * generating a new segment for each "run" of points in the vector
+ * path with monotonically increasing Y values. All the resulting
+ * values are then sorted.
+ *
+ * Note: I'm not sure that the sorting rule is correct with respect
+ * to numerical stability issues.
+ *
+ * Return value: Resulting sorted vector path.
+ **/
+ArtSVP *
+art_svp_from_vpath (ArtVpath *vpath)
+{
+  int n_segs, n_segs_max;
+  ArtSVP *svp;
+  int dir;
+  int new_dir;
+  int i;
+  ArtPoint *points;
+  int n_points, n_points_max;
+  double x, y;
+  double x_min, x_max;
+
+  n_segs = 0;
+  n_segs_max = 16;
+  svp = (ArtSVP *)art_alloc (sizeof(ArtSVP) +
+			     (n_segs_max - 1) * sizeof(ArtSVPSeg));
+
+  dir = 0;
+  n_points = 0;
+  n_points_max = 0;
+  points = NULL;
+  i = 0;
+
+  x = y = 0; /* unnecessary, given "first code must not be LINETO" invariant,
+		but it makes gcc -Wall -ansi -pedantic happier */
+  x_min = x_max = 0; /* same */
+
+  while (vpath[i].code != ART_END) {
+    if (vpath[i].code == ART_MOVETO || vpath[i].code == ART_MOVETO_OPEN)
+      {
+	if (points != NULL && n_points >= 2)
+	  {
+	    if (n_segs == n_segs_max)
+	      {
+		n_segs_max <<= 1;
+		svp = (ArtSVP *)art_realloc (svp, sizeof(ArtSVP) +
+					     (n_segs_max - 1) *
+					     sizeof(ArtSVPSeg));
+	      }
+	    svp->segs[n_segs].n_points = n_points;
+	    svp->segs[n_segs].dir = (dir > 0);
+	    if (dir < 0)
+	      reverse_points (points, n_points);
+	    svp->segs[n_segs].points = points;
+	    svp->segs[n_segs].bbox.x0 = x_min;
+	    svp->segs[n_segs].bbox.x1 = x_max;
+	    svp->segs[n_segs].bbox.y0 = points[0].y;
+	    svp->segs[n_segs].bbox.y1 = points[n_points - 1].y;
+	    n_segs++;
+	    points = NULL;
+	  }
+
+	if (points == NULL)
+	  {
+	    n_points_max = 4;
+	    points = art_new (ArtPoint, n_points_max);
+	  }
+
+	n_points = 1;
+	points[0].x = x = vpath[i].x;
+	points[0].y = y = vpath[i].y;
+	x_min = x;
+	x_max = x;
+	dir = 0;
+      }
+    else /* must be LINETO */
+      {
+	new_dir = (vpath[i].y > y ||
+		   (vpath[i].y == y && vpath[i].x > x)) ? 1 : -1;
+	if (dir && dir != new_dir)
+	  {
+	    /* new segment */
+	    x = points[n_points - 1].x;
+	    y = points[n_points - 1].y;
+	    if (n_segs == n_segs_max)
+	      {
+		n_segs_max <<= 1;
+		svp = (ArtSVP *)art_realloc (svp, sizeof(ArtSVP) +
+					     (n_segs_max - 1) *
+					     sizeof(ArtSVPSeg));
+	      }
+	    svp->segs[n_segs].n_points = n_points;
+	    svp->segs[n_segs].dir = (dir > 0);
+	    if (dir < 0)
+	      reverse_points (points, n_points);
+	    svp->segs[n_segs].points = points;
+	    svp->segs[n_segs].bbox.x0 = x_min;
+	    svp->segs[n_segs].bbox.x1 = x_max;
+	    svp->segs[n_segs].bbox.y0 = points[0].y;
+	    svp->segs[n_segs].bbox.y1 = points[n_points - 1].y;
+	    n_segs++;
+
+	    n_points = 1;
+	    n_points_max = 4;
+	    points = art_new (ArtPoint, n_points_max);
+	    points[0].x = x;
+	    points[0].y = y;
+	    x_min = x;
+	    x_max = x;
+	  }
+
+	if (points != NULL)
+	  {
+	    if (n_points == n_points_max)
+	      art_expand (points, ArtPoint, n_points_max);
+	    points[n_points].x = x = vpath[i].x;
+	    points[n_points].y = y = vpath[i].y;
+	    if (x < x_min) x_min = x;
+	    else if (x > x_max) x_max = x;
+	    n_points++;
+	  }
+	dir = new_dir;
+      }
+    i++;
+  }
+
+  if (points != NULL)
+    {
+      if (n_points >= 2)
+	{
+	  if (n_segs == n_segs_max)
+	    {
+	      n_segs_max <<= 1;
+	      svp = (ArtSVP *)art_realloc (svp, sizeof(ArtSVP) +
+					   (n_segs_max - 1) *
+					   sizeof(ArtSVPSeg));
+	    }
+	  svp->segs[n_segs].n_points = n_points;
+	  svp->segs[n_segs].dir = (dir > 0);
+	  if (dir < 0)
+	    reverse_points (points, n_points);
+	  svp->segs[n_segs].points = points;
+	  svp->segs[n_segs].bbox.x0 = x_min;
+	  svp->segs[n_segs].bbox.x1 = x_max;
+	  svp->segs[n_segs].bbox.y0 = points[0].y;
+	  svp->segs[n_segs].bbox.y1 = points[n_points - 1].y;
+	  n_segs++;
+	}
+      else
+	art_free (points);
+    }
+
+  svp->n_segs = n_segs;
+
+  qsort (&svp->segs, n_segs, sizeof (ArtSVPSeg), art_svp_seg_compare);
+
+  return svp;
+}
+

art_svp_vpath.h

@@ -0,0 +1,44 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_SVP_VPATH_H__
+#define __ART_SVP_VPATH_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_svp.h"
+#include "art_vpath.h"
+#else
+#include <libart_lgpl/art_svp.h>
+#include <libart_lgpl/art_vpath.h>
+#endif
+
+/* Sort vector paths into sorted vector paths. */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+ArtSVP *
+art_svp_from_vpath (ArtVpath *vpath);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_SVP_VPATH_H__ */

art_svp_vpath_stroke.c

@@ -0,0 +1,739 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998-2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+
+#include "config.h"
+#include "art_svp_vpath_stroke.h"
+
+#include <stdlib.h>
+#include <math.h>
+
+#include "art_misc.h"
+
+#include "art_vpath.h"
+#include "art_svp.h"
+#ifdef ART_USE_NEW_INTERSECTOR
+#include "art_svp_intersect.h"
+#else
+#include "art_svp_wind.h"
+#endif
+#include "art_svp_vpath.h"
+
+#define EPSILON 1e-6
+#define EPSILON_2 1e-12
+
+#define yes_OPTIMIZE_INNER
+
+/* Render an arc segment starting at (xc + x0, yc + y0) to (xc + x1,
+   yc + y1), centered at (xc, yc), and with given radius. Both x0^2 +
+   y0^2 and x1^2 + y1^2 should be equal to radius^2.
+
+   A positive value of radius means curve to the left, negative means
+   curve to the right.
+*/
+static void
+art_svp_vpath_stroke_arc (ArtVpath **p_vpath, int *pn, int *pn_max,
+			  double xc, double yc,
+			  double x0, double y0,
+			  double x1, double y1,
+			  double radius,
+			  double flatness)
+{
+  double theta;
+  double th_0, th_1;
+  int n_pts;
+  int i;
+  double aradius;
+
+  aradius = fabs (radius);
+  theta = 2 * M_SQRT2 * sqrt (flatness / aradius);
+  th_0 = atan2 (y0, x0);
+  th_1 = atan2 (y1, x1);
+  if (radius > 0)
+    {
+      /* curve to the left */
+      if (th_0 < th_1) th_0 += M_PI * 2;
+      n_pts = ceil ((th_0 - th_1) / theta);
+    }
+  else
+    {
+      /* curve to the right */
+      if (th_1 < th_0) th_1 += M_PI * 2;
+      n_pts = ceil ((th_1 - th_0) / theta);
+    }
+#ifdef VERBOSE
+  printf ("start %f %f; th_0 = %f, th_1 = %f, r = %f, theta = %f\n", x0, y0, th_0, th_1, radius, theta);
+#endif
+  art_vpath_add_point (p_vpath, pn, pn_max,
+		       ART_LINETO, xc + x0, yc + y0);
+  for (i = 1; i < n_pts; i++)
+    {
+      theta = th_0 + (th_1 - th_0) * i / n_pts;
+      art_vpath_add_point (p_vpath, pn, pn_max,
+			   ART_LINETO, xc + cos (theta) * aradius,
+			   yc + sin (theta) * aradius);
+#ifdef VERBOSE
+      printf ("mid %f %f\n", cos (theta) * radius, sin (theta) * radius);
+#endif
+    }
+  art_vpath_add_point (p_vpath, pn, pn_max,
+		       ART_LINETO, xc + x1, yc + y1);
+#ifdef VERBOSE
+  printf ("end %f %f\n", x1, y1);
+#endif
+}
+
+/* Assume that forw and rev are at point i0. Bring them to i1,
+   joining with the vector i1 - i2.
+
+   This used to be true, but isn't now that the stroke_raw code is
+   filtering out (near)zero length vectors: {It so happens that all
+   invocations of this function maintain the precondition i1 = i0 + 1,
+   so we could decrease the number of arguments by one. We haven't
+   done that here, though.}
+
+   forw is to the line's right and rev is to its left.
+
+   Precondition: no zero-length vectors, otherwise a divide by
+   zero will happen.  */
+static void
+render_seg (ArtVpath **p_forw, int *pn_forw, int *pn_forw_max,
+	    ArtVpath **p_rev, int *pn_rev, int *pn_rev_max,
+	    ArtVpath *vpath, int i0, int i1, int i2,
+	    ArtPathStrokeJoinType join,
+	    double line_width, double miter_limit, double flatness)
+{
+  double dx0, dy0;
+  double dx1, dy1;
+  double dlx0, dly0;
+  double dlx1, dly1;
+  double dmx, dmy;
+  double dmr2;
+  double scale;
+  double cross;
+
+#ifdef VERBOSE
+  printf ("join style = %d\n", join);
+#endif
+
+  /* The vectors of the lines from i0 to i1 and i1 to i2. */
+  dx0 = vpath[i1].x - vpath[i0].x;
+  dy0 = vpath[i1].y - vpath[i0].y;
+
+  dx1 = vpath[i2].x - vpath[i1].x;
+  dy1 = vpath[i2].y - vpath[i1].y;
+
+  /* Set dl[xy]0 to the vector from i0 to i1, rotated counterclockwise
+     90 degrees, and scaled to the length of line_width. */
+  scale = line_width / sqrt (dx0 * dx0 + dy0 * dy0);
+  dlx0 = dy0 * scale;
+  dly0 = -dx0 * scale;
+
+  /* Set dl[xy]1 to the vector from i1 to i2, rotated counterclockwise
+     90 degrees, and scaled to the length of line_width. */
+  scale = line_width / sqrt (dx1 * dx1 + dy1 * dy1);
+  dlx1 = dy1 * scale;
+  dly1 = -dx1 * scale;
+
+#ifdef VERBOSE
+  printf ("%% render_seg: (%g, %g) - (%g, %g) - (%g, %g)\n",
+	  vpath[i0].x, vpath[i0].y,
+	  vpath[i1].x, vpath[i1].y,
+	  vpath[i2].x, vpath[i2].y);
+
+  printf ("%% render_seg: d[xy]0 = (%g, %g), dl[xy]0 = (%g, %g)\n",
+	  dx0, dy0, dlx0, dly0);
+
+  printf ("%% render_seg: d[xy]1 = (%g, %g), dl[xy]1 = (%g, %g)\n",
+	  dx1, dy1, dlx1, dly1);
+#endif
+
+  /* now, forw's last point is expected to be colinear along d[xy]0
+     to point i0 - dl[xy]0, and rev with i0 + dl[xy]0. */
+
+  /* positive for positive area (i.e. left turn) */
+  cross = dx1 * dy0 - dx0 * dy1;
+
+  dmx = (dlx0 + dlx1) * 0.5;
+  dmy = (dly0 + dly1) * 0.5;
+  dmr2 = dmx * dmx + dmy * dmy;
+
+  if (join == ART_PATH_STROKE_JOIN_MITER &&
+      dmr2 * miter_limit * miter_limit < line_width * line_width)
+    join = ART_PATH_STROKE_JOIN_BEVEL;
+
+  /* the case when dmr2 is zero or very small bothers me
+     (i.e. near a 180 degree angle)
+     ALEX: So, we avoid the optimization when dmr2 is very small. This should
+     be safe since dmx/y is only used in optimization and in MITER case, and MITER
+     should be converted to BEVEL when dmr2 is very small. */
+  if (dmr2 > EPSILON_2)
+    {
+      scale = line_width * line_width / dmr2;
+      dmx *= scale;
+      dmy *= scale;
+    }
+
+  if (cross * cross < EPSILON_2 && dx0 * dx1 + dy0 * dy1 >= 0)
+    {
+      /* going straight */
+#ifdef VERBOSE
+      printf ("%% render_seg: straight\n");
+#endif
+      art_vpath_add_point (p_forw, pn_forw, pn_forw_max,
+		       ART_LINETO, vpath[i1].x - dlx0, vpath[i1].y - dly0);
+      art_vpath_add_point (p_rev, pn_rev, pn_rev_max,
+		       ART_LINETO, vpath[i1].x + dlx0, vpath[i1].y + dly0);
+    }
+  else if (cross > 0)
+    {
+      /* left turn, forw is outside and rev is inside */
+
+#ifdef VERBOSE
+      printf ("%% render_seg: left\n");
+#endif
+      if (
+#ifdef NO_OPTIMIZE_INNER
+	  0 &&
+#endif
+	  (dmr2 > EPSILON_2) &&
+	  /* check that i1 + dm[xy] is inside i0-i1 rectangle */
+	  (dx0 + dmx) * dx0 + (dy0 + dmy) * dy0 > 0 &&
+	  /* and that i1 + dm[xy] is inside i1-i2 rectangle */
+	  ((dx1 - dmx) * dx1 + (dy1 - dmy) * dy1 > 0)
+#ifdef PEDANTIC_INNER
+	  &&
+	  /* check that i1 + dl[xy]1 is inside i0-i1 rectangle */
+	  (dx0 + dlx1) * dx0 + (dy0 + dly1) * dy0 > 0 &&
+	  /* and that i1 + dl[xy]0 is inside i1-i2 rectangle */
+	  ((dx1 - dlx0) * dx1 + (dy1 - dly0) * dy1 > 0)
+#endif
+	  )
+	{
+	  /* can safely add single intersection point */
+	  art_vpath_add_point (p_rev, pn_rev, pn_rev_max,
+			   ART_LINETO, vpath[i1].x + dmx, vpath[i1].y + dmy);
+	}
+      else
+	{
+	  /* need to loop-de-loop the inside */
+	  art_vpath_add_point (p_rev, pn_rev, pn_rev_max,
+			   ART_LINETO, vpath[i1].x + dlx0, vpath[i1].y + dly0);
+	  art_vpath_add_point (p_rev, pn_rev, pn_rev_max,
+			   ART_LINETO, vpath[i1].x, vpath[i1].y);
+	  art_vpath_add_point (p_rev, pn_rev, pn_rev_max,
+			   ART_LINETO, vpath[i1].x + dlx1, vpath[i1].y + dly1);
+	}
+
+      if (join == ART_PATH_STROKE_JOIN_BEVEL)
+	{
+	  /* bevel */
+	  art_vpath_add_point (p_forw, pn_forw, pn_forw_max,
+			   ART_LINETO, vpath[i1].x - dlx0, vpath[i1].y - dly0);
+	  art_vpath_add_point (p_forw, pn_forw, pn_forw_max,
+			   ART_LINETO, vpath[i1].x - dlx1, vpath[i1].y - dly1);
+	}
+      else if (join == ART_PATH_STROKE_JOIN_MITER)
+	{
+	  art_vpath_add_point (p_forw, pn_forw, pn_forw_max,
+			   ART_LINETO, vpath[i1].x - dmx, vpath[i1].y - dmy);
+	}
+      else if (join == ART_PATH_STROKE_JOIN_ROUND)
+	art_svp_vpath_stroke_arc (p_forw, pn_forw, pn_forw_max,
+				  vpath[i1].x, vpath[i1].y,
+				  -dlx0, -dly0,
+				  -dlx1, -dly1,
+				  line_width,
+				  flatness);
+    }
+  else
+    {
+      /* right turn, rev is outside and forw is inside */
+#ifdef VERBOSE
+      printf ("%% render_seg: right\n");
+#endif
+
+      if (
+#ifdef NO_OPTIMIZE_INNER
+	  0 &&
+#endif
+	  (dmr2 > EPSILON_2) &&
+	  /* check that i1 - dm[xy] is inside i0-i1 rectangle */
+	  (dx0 - dmx) * dx0 + (dy0 - dmy) * dy0 > 0 &&
+	  /* and that i1 - dm[xy] is inside i1-i2 rectangle */
+	  ((dx1 + dmx) * dx1 + (dy1 + dmy) * dy1 > 0)
+#ifdef PEDANTIC_INNER
+	  &&
+	  /* check that i1 - dl[xy]1 is inside i0-i1 rectangle */
+	  (dx0 - dlx1) * dx0 + (dy0 - dly1) * dy0 > 0 &&
+	  /* and that i1 - dl[xy]0 is inside i1-i2 rectangle */
+	  ((dx1 + dlx0) * dx1 + (dy1 + dly0) * dy1 > 0)
+#endif
+	  )
+	{
+	  /* can safely add single intersection point */
+	  art_vpath_add_point (p_forw, pn_forw, pn_forw_max,
+			   ART_LINETO, vpath[i1].x - dmx, vpath[i1].y - dmy);
+	}
+      else
+	{
+	  /* need to loop-de-loop the inside */
+	  art_vpath_add_point (p_forw, pn_forw, pn_forw_max,
+			   ART_LINETO, vpath[i1].x - dlx0, vpath[i1].y - dly0);
+	  art_vpath_add_point (p_forw, pn_forw, pn_forw_max,
+			   ART_LINETO, vpath[i1].x, vpath[i1].y);
+	  art_vpath_add_point (p_forw, pn_forw, pn_forw_max,
+			   ART_LINETO, vpath[i1].x - dlx1, vpath[i1].y - dly1);
+	}
+
+      if (join == ART_PATH_STROKE_JOIN_BEVEL)
+	{
+	  /* bevel */
+	  art_vpath_add_point (p_rev, pn_rev, pn_rev_max,
+			   ART_LINETO, vpath[i1].x + dlx0, vpath[i1].y + dly0);
+	  art_vpath_add_point (p_rev, pn_rev, pn_rev_max,
+			   ART_LINETO, vpath[i1].x + dlx1, vpath[i1].y + dly1);
+	}
+      else if (join == ART_PATH_STROKE_JOIN_MITER)
+	{
+	  art_vpath_add_point (p_rev, pn_rev, pn_rev_max,
+			   ART_LINETO, vpath[i1].x + dmx, vpath[i1].y + dmy);
+	}
+      else if (join == ART_PATH_STROKE_JOIN_ROUND)
+	art_svp_vpath_stroke_arc (p_rev, pn_rev, pn_rev_max,
+				  vpath[i1].x, vpath[i1].y,
+				  dlx0, dly0,
+				  dlx1, dly1,
+				  -line_width,
+				  flatness);
+
+    }
+}
+
+/* caps i1, under the assumption of a vector from i0 */
+static void
+render_cap (ArtVpath **p_result, int *pn_result, int *pn_result_max,
+	    ArtVpath *vpath, int i0, int i1,
+	    ArtPathStrokeCapType cap, double line_width, double flatness)
+{
+  double dx0, dy0;
+  double dlx0, dly0;
+  double scale;
+  int n_pts;
+  int i;
+
+  dx0 = vpath[i1].x - vpath[i0].x;
+  dy0 = vpath[i1].y - vpath[i0].y;
+
+  /* Set dl[xy]0 to the vector from i0 to i1, rotated counterclockwise
+     90 degrees, and scaled to the length of line_width. */
+  scale = line_width / sqrt (dx0 * dx0 + dy0 * dy0);
+  dlx0 = dy0 * scale;
+  dly0 = -dx0 * scale;
+
+#ifdef VERBOSE
+  printf ("cap style = %d\n", cap);
+#endif
+
+  switch (cap)
+    {
+    case ART_PATH_STROKE_CAP_BUTT:
+      art_vpath_add_point (p_result, pn_result, pn_result_max,
+			   ART_LINETO, vpath[i1].x - dlx0, vpath[i1].y - dly0);
+      art_vpath_add_point (p_result, pn_result, pn_result_max,
+			   ART_LINETO, vpath[i1].x + dlx0, vpath[i1].y + dly0);
+      break;
+    case ART_PATH_STROKE_CAP_ROUND:
+      n_pts = ceil (M_PI / (2.0 * M_SQRT2 * sqrt (flatness / line_width)));
+      art_vpath_add_point (p_result, pn_result, pn_result_max,
+			   ART_LINETO, vpath[i1].x - dlx0, vpath[i1].y - dly0);
+      for (i = 1; i < n_pts; i++)
+	{
+	  double theta, c_th, s_th;
+
+	  theta = M_PI * i / n_pts;
+	  c_th = cos (theta);
+	  s_th = sin (theta);
+	  art_vpath_add_point (p_result, pn_result, pn_result_max,
+			       ART_LINETO,
+			       vpath[i1].x - dlx0 * c_th - dly0 * s_th,
+			       vpath[i1].y - dly0 * c_th + dlx0 * s_th);
+	}
+      art_vpath_add_point (p_result, pn_result, pn_result_max,
+			   ART_LINETO, vpath[i1].x + dlx0, vpath[i1].y + dly0);
+      break;
+    case ART_PATH_STROKE_CAP_SQUARE:
+      art_vpath_add_point (p_result, pn_result, pn_result_max,
+			   ART_LINETO,
+			   vpath[i1].x - dlx0 - dly0,
+			   vpath[i1].y - dly0 + dlx0);
+      art_vpath_add_point (p_result, pn_result, pn_result_max,
+			   ART_LINETO,
+			   vpath[i1].x + dlx0 - dly0,
+			   vpath[i1].y + dly0 + dlx0);
+      break;
+    }
+}
+
+/**
+ * art_svp_from_vpath_raw: Stroke a vector path, raw version
+ * @vpath: #ArtVPath to stroke.
+ * @join: Join style.
+ * @cap: Cap style.
+ * @line_width: Width of stroke.
+ * @miter_limit: Miter limit.
+ * @flatness: Flatness.
+ *
+ * Exactly the same as art_svp_vpath_stroke(), except that the resulting
+ * stroke outline may self-intersect and have regions of winding number
+ * greater than 1.
+ *
+ * Return value: Resulting raw stroked outline in svp format.
+ **/
+ArtVpath *
+art_svp_vpath_stroke_raw (ArtVpath *vpath,
+			  ArtPathStrokeJoinType join,
+			  ArtPathStrokeCapType cap,
+			  double line_width,
+			  double miter_limit,
+			  double flatness)
+{
+  int begin_idx, end_idx;
+  int i;
+  ArtVpath *forw, *rev;
+  int n_forw, n_rev;
+  int n_forw_max, n_rev_max;
+  ArtVpath *result;
+  int n_result, n_result_max;
+  double half_lw = 0.5 * line_width;
+  int closed;
+  int last, this, next, second;
+  double dx, dy;
+
+  n_forw_max = 16;
+  forw = art_new (ArtVpath, n_forw_max);
+
+  n_rev_max = 16;
+  rev = art_new (ArtVpath, n_rev_max);
+
+  n_result = 0;
+  n_result_max = 16;
+  result = art_new (ArtVpath, n_result_max);
+
+  for (begin_idx = 0; vpath[begin_idx].code != ART_END; begin_idx = end_idx)
+    {
+      n_forw = 0;
+      n_rev = 0;
+
+      closed = (vpath[begin_idx].code == ART_MOVETO);
+
+      /* we don't know what the first point joins with until we get to the
+	 last point and see if it's closed. So we start with the second
+	 line in the path.
+
+	 Note: this is not strictly true (we now know it's closed from
+	 the opening pathcode), but why fix code that isn't broken?
+      */
+
+      this = begin_idx;
+      /* skip over identical points at the beginning of the subpath */
+      for (i = this + 1; vpath[i].code == ART_LINETO; i++)
+	{
+	  dx = vpath[i].x - vpath[this].x;
+	  dy = vpath[i].y - vpath[this].y;
+	  if (dx * dx + dy * dy > EPSILON_2)
+	    break;
+	}
+      next = i;
+      second = next;
+
+      /* invariant: this doesn't coincide with next */
+      while (vpath[next].code == ART_LINETO)
+	{
+	  last = this;
+	  this = next;
+	  /* skip over identical points after the beginning of the subpath */
+	  for (i = this + 1; vpath[i].code == ART_LINETO; i++)
+	    {
+	      dx = vpath[i].x - vpath[this].x;
+	      dy = vpath[i].y - vpath[this].y;
+	      if (dx * dx + dy * dy > EPSILON_2)
+		break;
+	    }
+	  next = i;
+	  if (vpath[next].code != ART_LINETO)
+	    {
+	      /* reached end of path */
+	      /* make "closed" detection conform to PostScript
+		 semantics (i.e. explicit closepath code rather than
+		 just the fact that end of the path is the beginning) */
+	      if (closed &&
+		  vpath[this].x == vpath[begin_idx].x &&
+		  vpath[this].y == vpath[begin_idx].y)
+		{
+		  int j;
+
+		  /* path is closed, render join to beginning */
+		  render_seg (&forw, &n_forw, &n_forw_max,
+			      &rev, &n_rev, &n_rev_max,
+			      vpath, last, this, second,
+			      join, half_lw, miter_limit, flatness);
+
+#ifdef VERBOSE
+		  printf ("%% forw %d, rev %d\n", n_forw, n_rev);
+#endif
+		  /* do forward path */
+		  art_vpath_add_point (&result, &n_result, &n_result_max,
+				   ART_MOVETO, forw[n_forw - 1].x,
+				   forw[n_forw - 1].y);
+		  for (j = 0; j < n_forw; j++)
+		    art_vpath_add_point (&result, &n_result, &n_result_max,
+				     ART_LINETO, forw[j].x,
+				     forw[j].y);
+
+		  /* do reverse path, reversed */
+		  art_vpath_add_point (&result, &n_result, &n_result_max,
+				   ART_MOVETO, rev[0].x,
+				   rev[0].y);
+		  for (j = n_rev - 1; j >= 0; j--)
+		    art_vpath_add_point (&result, &n_result, &n_result_max,
+				     ART_LINETO, rev[j].x,
+				     rev[j].y);
+		}
+	      else
+		{
+		  /* path is open */
+		  int j;
+
+		  /* add to forw rather than result to ensure that
+		     forw has at least one point. */
+		  render_cap (&forw, &n_forw, &n_forw_max,
+			      vpath, last, this,
+			      cap, half_lw, flatness);
+		  art_vpath_add_point (&result, &n_result, &n_result_max,
+				   ART_MOVETO, forw[0].x,
+				   forw[0].y);
+		  for (j = 1; j < n_forw; j++)
+		    art_vpath_add_point (&result, &n_result, &n_result_max,
+				     ART_LINETO, forw[j].x,
+				     forw[j].y);
+		  for (j = n_rev - 1; j >= 0; j--)
+		    art_vpath_add_point (&result, &n_result, &n_result_max,
+				     ART_LINETO, rev[j].x,
+				     rev[j].y);
+		  render_cap (&result, &n_result, &n_result_max,
+			      vpath, second, begin_idx,
+			      cap, half_lw, flatness);
+		  art_vpath_add_point (&result, &n_result, &n_result_max,
+				   ART_LINETO, forw[0].x,
+				   forw[0].y);
+		}
+	    }
+	  else
+	    render_seg (&forw, &n_forw, &n_forw_max,
+			&rev, &n_rev, &n_rev_max,
+			vpath, last, this, next,
+			join, half_lw, miter_limit, flatness);
+	}
+      end_idx = next;
+    }
+
+  art_free (forw);
+  art_free (rev);
+#ifdef VERBOSE
+  printf ("%% n_result = %d\n", n_result);
+#endif
+  art_vpath_add_point (&result, &n_result, &n_result_max, ART_END, 0, 0);
+  return result;
+}
+
+#define noVERBOSE
+
+#ifdef VERBOSE
+
+#define XOFF 50
+#define YOFF 700
+
+static void
+print_ps_vpath (ArtVpath *vpath)
+{
+  int i;
+
+  for (i = 0; vpath[i].code != ART_END; i++)
+    {
+      switch (vpath[i].code)
+	{
+	case ART_MOVETO:
+	  printf ("%g %g moveto\n", XOFF + vpath[i].x, YOFF - vpath[i].y);
+	  break;
+	case ART_LINETO:
+	  printf ("%g %g lineto\n", XOFF + vpath[i].x, YOFF - vpath[i].y);
+	  break;
+	default:
+	  break;
+	}
+    }
+  printf ("stroke showpage\n");
+}
+
+static void
+print_ps_svp (ArtSVP *vpath)
+{
+  int i, j;
+
+  printf ("%% begin\n");
+  for (i = 0; i < vpath->n_segs; i++)
+    {
+      printf ("%g setgray\n", vpath->segs[i].dir ? 0.7 : 0);
+      for (j = 0; j < vpath->segs[i].n_points; j++)
+	{
+	  printf ("%g %g %s\n",
+		  XOFF + vpath->segs[i].points[j].x,
+		  YOFF - vpath->segs[i].points[j].y,
+		  j ? "lineto" : "moveto");
+	}
+      printf ("stroke\n");
+    }
+
+  printf ("showpage\n");
+}
+#endif
+
+/* Render a vector path into a stroked outline.
+
+   Status of this routine:
+
+   Basic correctness: Only miter and bevel line joins are implemented,
+   and only butt line caps. Otherwise, seems to be fine.
+
+   Numerical stability: We cheat (adding random perturbation). Thus,
+   it seems very likely that no numerical stability problems will be
+   seen in practice.
+
+   Speed: Should be pretty good.
+
+   Precision: The perturbation fuzzes the coordinates slightly,
+   but not enough to be visible.  */
+/**
+ * art_svp_vpath_stroke: Stroke a vector path.
+ * @vpath: #ArtVPath to stroke.
+ * @join: Join style.
+ * @cap: Cap style.
+ * @line_width: Width of stroke.
+ * @miter_limit: Miter limit.
+ * @flatness: Flatness.
+ *
+ * Computes an svp representing the stroked outline of @vpath. The
+ * width of the stroked line is @line_width.
+ *
+ * Lines are joined according to the @join rule. Possible values are
+ * ART_PATH_STROKE_JOIN_MITER (for mitered joins),
+ * ART_PATH_STROKE_JOIN_ROUND (for round joins), and
+ * ART_PATH_STROKE_JOIN_BEVEL (for bevelled joins). The mitered join
+ * is converted to a bevelled join if the miter would extend to a
+ * distance of more than @miter_limit * @line_width from the actual
+ * join point.
+ *
+ * If there are open subpaths, the ends of these subpaths are capped
+ * according to the @cap rule. Possible values are
+ * ART_PATH_STROKE_CAP_BUTT (squared cap, extends exactly to end
+ * point), ART_PATH_STROKE_CAP_ROUND (rounded half-circle centered at
+ * the end point), and ART_PATH_STROKE_CAP_SQUARE (squared cap,
+ * extending half @line_width past the end point).
+ *
+ * The @flatness parameter controls the accuracy of the rendering. It
+ * is most important for determining the number of points to use to
+ * approximate circular arcs for round lines and joins. In general, the
+ * resulting vector path will be within @flatness pixels of the "ideal"
+ * path containing actual circular arcs. I reserve the right to use
+ * the @flatness parameter to convert bevelled joins to miters for very
+ * small turn angles, as this would reduce the number of points in the
+ * resulting outline path.
+ *
+ * The resulting path is "clean" with respect to self-intersections, i.e.
+ * the winding number is 0 or 1 at each point.
+ *
+ * Return value: Resulting stroked outline in svp format.
+ **/
+ArtSVP *
+art_svp_vpath_stroke (ArtVpath *vpath,
+		      ArtPathStrokeJoinType join,
+		      ArtPathStrokeCapType cap,
+		      double line_width,
+		      double miter_limit,
+		      double flatness)
+{
+#ifdef ART_USE_NEW_INTERSECTOR
+  ArtVpath *vpath_stroke;
+  ArtSVP *svp, *svp2;
+  ArtSvpWriter *swr;
+
+  vpath_stroke = art_svp_vpath_stroke_raw (vpath, join, cap,
+					   line_width, miter_limit, flatness);
+#ifdef VERBOSE
+  print_ps_vpath (vpath_stroke);
+#endif
+  svp = art_svp_from_vpath (vpath_stroke);
+#ifdef VERBOSE
+  print_ps_svp (svp);
+#endif
+  art_free (vpath_stroke);
+
+  swr = art_svp_writer_rewind_new (ART_WIND_RULE_NONZERO);
+  art_svp_intersector (svp, swr);
+
+  svp2 = art_svp_writer_rewind_reap (swr);
+#ifdef VERBOSE
+  print_ps_svp (svp2);
+#endif
+  art_svp_free (svp);
+  return svp2;
+#else
+  ArtVpath *vpath_stroke, *vpath2;
+  ArtSVP *svp, *svp2, *svp3;
+
+  vpath_stroke = art_svp_vpath_stroke_raw (vpath, join, cap,
+					   line_width, miter_limit, flatness);
+#ifdef VERBOSE
+  print_ps_vpath (vpath_stroke);
+#endif
+  vpath2 = art_vpath_perturb (vpath_stroke);
+#ifdef VERBOSE
+  print_ps_vpath (vpath2);
+#endif
+  art_free (vpath_stroke);
+  svp = art_svp_from_vpath (vpath2);
+#ifdef VERBOSE
+  print_ps_svp (svp);
+#endif
+  art_free (vpath2);
+  svp2 = art_svp_uncross (svp);
+#ifdef VERBOSE
+  print_ps_svp (svp2);
+#endif
+  art_svp_free (svp);
+  svp3 = art_svp_rewind_uncrossed (svp2, ART_WIND_RULE_NONZERO);
+#ifdef VERBOSE
+  print_ps_svp (svp3);
+#endif
+  art_svp_free (svp2);
+
+  return svp3;
+#endif
+}

art_svp_vpath_stroke.h

@@ -0,0 +1,70 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_SVP_VPATH_STROKE_H__
+#define __ART_SVP_VPATH_STROKE_H__
+
+/* Sort vector paths into sorted vector paths. */
+
+#ifdef LIBART_COMPILATION
+#include "art_svp.h"
+#include "art_vpath.h"
+#else
+#include <libart_lgpl/art_svp.h>
+#include <libart_lgpl/art_vpath.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef enum {
+  ART_PATH_STROKE_JOIN_MITER,
+  ART_PATH_STROKE_JOIN_ROUND,
+  ART_PATH_STROKE_JOIN_BEVEL
+} ArtPathStrokeJoinType;
+
+typedef enum {
+  ART_PATH_STROKE_CAP_BUTT,
+  ART_PATH_STROKE_CAP_ROUND,
+  ART_PATH_STROKE_CAP_SQUARE
+} ArtPathStrokeCapType;
+
+ArtSVP *
+art_svp_vpath_stroke (ArtVpath *vpath,
+		      ArtPathStrokeJoinType join,
+		      ArtPathStrokeCapType cap,
+		      double line_width,
+		      double miter_limit,
+		      double flatness);
+
+/* This version may have winding numbers exceeding 1. */
+ArtVpath *
+art_svp_vpath_stroke_raw (ArtVpath *vpath,
+			  ArtPathStrokeJoinType join,
+			  ArtPathStrokeCapType cap,
+			  double line_width,
+			  double miter_limit,
+			  double flatness);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_SVP_VPATH_STROKE_H__ */

art_svp_wind.h

@@ -0,0 +1,57 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_SVP_WIND_H__
+#define __ART_SVP_WIND_H__
+
+/* Primitive intersection and winding number operations on sorted
+   vector paths. */
+
+#ifdef LIBART_COMPILATION
+#include "art_svp.h"
+#else
+#include <libart_lgpl/art_svp.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#ifndef ART_WIND_RULE_DEFINED
+#define ART_WIND_RULE_DEFINED
+typedef enum {
+  ART_WIND_RULE_NONZERO,
+  ART_WIND_RULE_INTERSECT,
+  ART_WIND_RULE_ODDEVEN,
+  ART_WIND_RULE_POSITIVE
+} ArtWindRule;
+#endif
+
+ArtSVP *
+art_svp_uncross (ArtSVP *vp);
+
+ArtSVP *
+art_svp_rewind_uncrossed (ArtSVP *vp, ArtWindRule rule);
+
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_SVP_WIND_H__ */

art_uta.c

@@ -0,0 +1,88 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_uta.h"
+
+#include <string.h>
+#include "art_misc.h"
+
+/**
+ * art_uta_new: Allocate a new uta.
+ * @x0: Left coordinate of uta.
+ * @y0: Top coordinate of uta.
+ * @x1: Right coordinate of uta.
+ * @y1: Bottom coordinate of uta.
+ *
+ * Allocates a new microtile array. The arguments are in units of
+ * tiles, not pixels.
+ *
+ * Returns: the newly allocated #ArtUta.
+ **/
+ArtUta *
+art_uta_new (int x0, int y0, int x1, int y1)
+{
+  ArtUta *uta;
+
+  uta = art_new (ArtUta, 1);
+  uta->x0 = x0;
+  uta->y0 = y0;
+  uta->width = x1 - x0;
+  uta->height = y1 - y0;
+
+  uta->utiles = art_new (ArtUtaBbox, uta->width * uta->height);
+
+  memset (uta->utiles, 0, uta->width * uta->height * sizeof(ArtUtaBbox));
+  return uta;
+  }
+
+/**
+ * art_uta_new_coords: Allocate a new uta, based on pixel coordinates.
+ * @x0: Left coordinate of uta.
+ * @y0: Top coordinate of uta.
+ * @x1: Right coordinate of uta.
+ * @y1: Bottom coordinate of uta.
+ *
+ * Allocates a new microtile array. The arguments are in pixels
+ *
+ * Returns: the newly allocated #ArtUta.
+ **/
+ArtUta *
+art_uta_new_coords (int x0, int y0, int x1, int y1)
+{
+  return art_uta_new (x0 >> ART_UTILE_SHIFT, y0 >> ART_UTILE_SHIFT,
+		      1 + (x1 >> ART_UTILE_SHIFT),
+		      1 + (y1 >> ART_UTILE_SHIFT));
+}
+
+/**
+ * art_uta_free: Free a uta.
+ * @uta: The uta to free.
+ *
+ * Frees the microtile array structure, including the actual microtile
+ * data.
+ **/
+void
+art_uta_free (ArtUta *uta)
+{
+  art_free (uta->utiles);
+  art_free (uta);
+}
+
+/* User to Aardvark! */

art_uta.h

@@ -0,0 +1,72 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_UTA_H__
+#define __ART_UTA_H__
+
+/* Basic data structures and constructors for microtile arrays */
+
+#ifdef LIBART_COMPILATION
+#include "art_misc.h"
+#else
+#include <libart_lgpl/art_misc.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef art_u32 ArtUtaBbox;
+typedef struct _ArtUta ArtUta;
+
+#define ART_UTA_BBOX_CONS(x0, y0, x1, y1) (((x0) << 24) | ((y0) << 16) | \
+				       ((x1) << 8) | (y1))
+
+#define ART_UTA_BBOX_X0(ub) ((ub) >> 24)
+#define ART_UTA_BBOX_Y0(ub) (((ub) >> 16) & 0xff)
+#define ART_UTA_BBOX_X1(ub) (((ub) >> 8) & 0xff)
+#define ART_UTA_BBOX_Y1(ub) ((ub) & 0xff)
+
+#define ART_UTILE_SHIFT 5
+#define ART_UTILE_SIZE (1 << ART_UTILE_SHIFT)
+
+/* Coordinates are shifted right by ART_UTILE_SHIFT wrt the real
+   coordinates. */
+struct _ArtUta {
+  int x0;
+  int y0;
+  int width;
+  int height;
+  ArtUtaBbox *utiles;
+};
+
+ArtUta *
+art_uta_new (int x0, int y0, int x1, int y1);
+
+ArtUta *
+art_uta_new_coords (int x0, int y0, int x1, int y1);
+
+void
+art_uta_free (ArtUta *uta);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_UTA_H__ */

art_uta_ops.c

@@ -0,0 +1,112 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998-2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_uta_ops.h"
+
+#include <string.h>
+#include "art_misc.h"
+#include "art_uta.h"
+
+#ifndef MIN
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
+#endif
+
+#ifndef MAX
+#define MAX(a,b) ((a) > (b) ? (a) : (b))
+#endif
+
+/**
+ * art_uta_union: Compute union of two uta's.
+ * @uta1: One uta.
+ * @uta2: The other uta.
+ *
+ * Computes the union of @uta1 and @uta2. The union is approximate,
+ * but coverage is guaranteed over all pixels included in either of
+ * the arguments, ie more pixels may be covered than the "exact"
+ * union.
+ *
+ * Note: this routine is used in the Gnome Canvas to accumulate the
+ * region that needs to be repainted. However, since it copies over
+ * the entire uta (which might be largish) even when the update may be
+ * small, it can be a performance bottleneck. There are two approaches
+ * to this problem, both of which are probably worthwhile. First, the
+ * generated uta's should always be limited to the visible window,
+ * thus guaranteeing that uta's never become large. Second, there
+ * should be a new, destructive union operation that only touches a
+ * small part of the uta when the update is small.
+ *
+ * Return value: The new union uta.
+ **/
+ArtUta *
+art_uta_union (ArtUta *uta1, ArtUta *uta2)
+{
+  ArtUta *uta;
+  int x0, y0, x1, y1;
+  int x, y;
+  int ix, ix1, ix2;
+  ArtUtaBbox bb, bb1, bb2;
+
+  x0 = MIN(uta1->x0, uta2->x0);
+  y0 = MIN(uta1->y0, uta2->y0);
+  x1 = MAX(uta1->x0 + uta1->width, uta2->x0 + uta2->width);
+  y1 = MAX(uta1->y0 + uta1->height, uta2->y0 + uta2->height);
+  uta = art_uta_new (x0, y0, x1, y1);
+
+  /* could move the first two if/else statements out of the loop */
+  ix = 0;
+  for (y = y0; y < y1; y++)
+    {
+      ix1 = (y - uta1->y0) * uta1->width + x0 - uta1->x0;
+      ix2 = (y - uta2->y0) * uta2->width + x0 - uta2->x0;
+      for (x = x0; x < x1; x++)
+	{
+	  if (x < uta1->x0 || y < uta1->y0 ||
+	      x >= uta1->x0 + uta1->width || y >= uta1->y0 + uta1->height)
+	    bb1 = 0;
+	  else
+	    bb1 = uta1->utiles[ix1];
+
+	  if (x < uta2->x0 || y < uta2->y0 ||
+	      x >= uta2->x0 + uta2->width || y >= uta2->y0 + uta2->height)
+	    bb2 = 0;
+	  else
+	    bb2 = uta2->utiles[ix2];
+
+	  if (bb1 == 0)
+	    bb = bb2;
+	  else if (bb2 == 0)
+	    bb = bb1;
+	  else
+	    bb = ART_UTA_BBOX_CONS(MIN(ART_UTA_BBOX_X0(bb1),
+				       ART_UTA_BBOX_X0(bb2)),
+				   MIN(ART_UTA_BBOX_Y0(bb1),
+				       ART_UTA_BBOX_Y0(bb2)),
+				   MAX(ART_UTA_BBOX_X1(bb1),
+				       ART_UTA_BBOX_X1(bb2)),
+				   MAX(ART_UTA_BBOX_Y1(bb1),
+				       ART_UTA_BBOX_Y1(bb2)));
+	  uta->utiles[ix] = bb;
+	  ix++;
+	  ix1++;
+	  ix2++;
+	}
+    }
+  return uta;
+}

art_uta_ops.h

@@ -0,0 +1,42 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_UTA_OPS_H__
+#define __ART_UTA_OPS_H__
+
+/* Basic operations on microtile arrays */
+
+#ifdef LIBART_COMPILATION
+#include "art_uta.h"
+#else
+#include <libart_lgpl/art_uta.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+ArtUta *
+art_uta_union (ArtUta *uta1, ArtUta *uta2);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_UTA_OPS_H__ */

art_uta_rect.c

@@ -0,0 +1,111 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_uta_rect.h"
+
+#include "art_misc.h"
+#include "art_uta.h"
+#include "art_rect.h"
+
+/**
+ * art_uta_from_irect: Generate uta covering a rectangle.
+ * @bbox: The source rectangle.
+ *
+ * Generates a uta exactly covering @bbox. Please do not call this
+ * function with a @bbox with zero height or width.
+ *
+ * Return value: the new uta.
+ **/
+ArtUta *
+art_uta_from_irect (ArtIRect *bbox)
+{
+  ArtUta *uta;
+  ArtUtaBbox *utiles;
+  ArtUtaBbox bb;
+  int width, height;
+  int x, y;
+  int xf0, yf0, xf1, yf1;
+  int ix;
+
+  uta = art_new (ArtUta, 1);
+  uta->x0 = bbox->x0 >> ART_UTILE_SHIFT;
+  uta->y0 = bbox->y0 >> ART_UTILE_SHIFT;
+  width = ((bbox->x1 + ART_UTILE_SIZE - 1) >> ART_UTILE_SHIFT) - uta->x0;
+  height = ((bbox->y1 + ART_UTILE_SIZE - 1) >> ART_UTILE_SHIFT) - uta->y0;
+  utiles = art_new (ArtUtaBbox, width * height);
+
+  uta->width = width;
+  uta->height = height;
+  uta->utiles = utiles;
+
+  xf0 = bbox->x0 & (ART_UTILE_SIZE - 1);
+  yf0 = bbox->y0 & (ART_UTILE_SIZE - 1);
+  xf1 = ((bbox->x1 - 1) & (ART_UTILE_SIZE - 1)) + 1;
+  yf1 = ((bbox->y1 - 1) & (ART_UTILE_SIZE - 1)) + 1;
+  if (height == 1)
+    {
+      if (width == 1)
+	utiles[0] = ART_UTA_BBOX_CONS (xf0, yf0, xf1, yf1);
+      else
+	{
+	  utiles[0] = ART_UTA_BBOX_CONS (xf0, yf0, ART_UTILE_SIZE, yf1);
+	  bb = ART_UTA_BBOX_CONS (0, yf0, ART_UTILE_SIZE, yf1);
+	  for (x = 1; x < width - 1; x++)
+	    utiles[x] = bb;
+	  utiles[x] = ART_UTA_BBOX_CONS (0, yf0, xf1, yf1);
+	}
+    }
+  else
+    {
+      if (width == 1)
+	{
+	  utiles[0] = ART_UTA_BBOX_CONS (xf0, yf0, xf1, ART_UTILE_SIZE);
+	  bb = ART_UTA_BBOX_CONS (xf0, 0, xf1, ART_UTILE_SIZE);
+	  for (y = 1; y < height - 1; y++)
+	    utiles[y] = bb;
+	  utiles[y] = ART_UTA_BBOX_CONS (xf0, 0, xf1, yf1);
+	}
+      else
+	{
+	  utiles[0] =
+	    ART_UTA_BBOX_CONS (xf0, yf0, ART_UTILE_SIZE, ART_UTILE_SIZE);
+	  bb = ART_UTA_BBOX_CONS (0, yf0, ART_UTILE_SIZE, ART_UTILE_SIZE);
+	  for (x = 1; x < width - 1; x++)
+	    utiles[x] = bb;
+	  utiles[x] = ART_UTA_BBOX_CONS (0, yf0, xf1, ART_UTILE_SIZE);
+	  ix = width;
+	  for (y = 1; y < height - 1; y++)
+	    {
+	      utiles[ix++] =
+		ART_UTA_BBOX_CONS (xf0, 0, ART_UTILE_SIZE, ART_UTILE_SIZE);
+	      bb = ART_UTA_BBOX_CONS (0, 0, ART_UTILE_SIZE, ART_UTILE_SIZE);
+	      for (x = 1; x < width - 1; x++)
+		utiles[ix++] = bb;
+	      utiles[ix++] = ART_UTA_BBOX_CONS (0, 0, xf1, ART_UTILE_SIZE);
+	    }
+	  utiles[ix++] = ART_UTA_BBOX_CONS (xf0, 0, ART_UTILE_SIZE, yf1);
+	  bb = ART_UTA_BBOX_CONS (0, 0, ART_UTILE_SIZE, yf1);
+	  for (x = 1; x < width - 1; x++)
+	    utiles[ix++] = bb;
+	  utiles[ix++] = ART_UTA_BBOX_CONS (0, 0, xf1, yf1);
+	}
+    }
+  return uta;
+}

art_uta_rect.h

@@ -0,0 +1,42 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_UTA_RECT_H__
+#define __ART_UTA_RECT_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_rect.h"
+#include "art_uta.h"
+#else
+#include <libart_lgpl/art_rect.h>
+#include <libart_lgpl/art_uta.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+ArtUta *
+art_uta_from_irect (ArtIRect *bbox);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_UTA_RECT_H__ */

art_uta_svp.c

@@ -0,0 +1,54 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998-2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* LGPL Copyright 1998 Raph Levien <raph@acm.org> */
+
+#include "config.h"
+#include "art_uta_svp.h"
+
+#include "art_misc.h"
+#include "art_vpath.h"
+#include "art_uta.h"
+#include "art_uta_vpath.h"
+#include "art_svp.h"
+#include "art_vpath_svp.h"
+
+/**
+ * art_uta_from_svp: Generate uta covering an svp.
+ * @svp: The source svp.
+ *
+ * Generates a uta covering @svp. The resulting uta is of course
+ * approximate, ie it may cover more pixels than covered by @svp.
+ *
+ * Note: I will want to replace this with a more direct
+ * implementation. But this gets the api in place.
+ *
+ * Return value: the new uta.
+ **/
+ArtUta *
+art_uta_from_svp (const ArtSVP *svp)
+{
+  ArtVpath *vpath;
+  ArtUta *uta;
+
+  vpath = art_vpath_from_svp (svp);
+  uta = art_uta_from_vpath (vpath);
+  art_free (vpath);
+  return uta;
+}

art_uta_svp.h

@@ -0,0 +1,45 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_UTA_SVP_H__
+#define __ART_UTA_SVP_H__
+
+/* Basic data structures and constructors for microtile arrays */
+
+#ifdef LIBART_COMPILATION
+#include "art_svp.h"
+#include "art_uta.h"
+#else
+#include <libart_lgpl/art_svp.h>
+#include <libart_lgpl/art_uta.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+ArtUta *
+art_uta_from_svp (const ArtSVP *svp);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_UTA_SVP_H__ */
+

art_uta_vpath.c

@@ -0,0 +1,382 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998-2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_uta_vpath.h"
+
+#include <math.h>
+
+#include "art_misc.h"
+#include "art_vpath.h"
+#include "art_uta.h"
+
+#ifndef MAX
+#define MAX(a, b)  (((a) > (b)) ? (a) : (b))
+#endif /* MAX */
+
+#ifndef MIN
+#define MIN(a, b)  (((a) < (b)) ? (a) : (b))
+#endif /* MIN */
+
+/**
+ * art_uta_add_line: Add a line to the uta.
+ * @uta: The uta to modify.
+ * @x0: X coordinate of line start point.
+ * @y0: Y coordinate of line start point.
+ * @x1: X coordinate of line end point.
+ * @y1: Y coordinate of line end point.
+ * @rbuf: Buffer containing first difference of winding number.
+ * @rbuf_rowstride: Rowstride of @rbuf.
+ *
+ * Add the line (@x0, @y0) - (@x1, @y1) to @uta, and also update the
+ * winding number buffer used for rendering the interior. @rbuf
+ * contains the first partial difference (in the X direction) of the
+ * winding number, measured in grid cells. Thus, each time that a line
+ * crosses a horizontal uta grid line, an entry of @rbuf is
+ * incremented if @y1 > @y0, decremented otherwise.
+ *
+ * Note that edge handling is fairly delicate. Please rtfs for
+ * details.
+ **/
+void
+art_uta_add_line (ArtUta *uta, double x0, double y0, double x1, double y1,
+		  int *rbuf, int rbuf_rowstride)
+{
+  int xmin, ymin;
+  double xmax, ymax;
+  int xmaxf, ymaxf;
+  int xmaxc, ymaxc;
+  int xt0, yt0;
+  int xt1, yt1;
+  int xf0, yf0;
+  int xf1, yf1;
+  int ix, ix1;
+  ArtUtaBbox bb;
+
+  xmin = floor (MIN(x0, x1));
+  xmax = MAX(x0, x1);
+  xmaxf = floor (xmax);
+  xmaxc = ceil (xmax);
+  ymin = floor (MIN(y0, y1));
+  ymax = MAX(y0, y1);
+  ymaxf = floor (ymax);
+  ymaxc = ceil (ymax);
+  xt0 = (xmin >> ART_UTILE_SHIFT) - uta->x0;
+  yt0 = (ymin >> ART_UTILE_SHIFT) - uta->y0;
+  xt1 = (xmaxf >> ART_UTILE_SHIFT) - uta->x0;
+  yt1 = (ymaxf >> ART_UTILE_SHIFT) - uta->y0;
+  if (xt0 == xt1 && yt0 == yt1)
+    {
+      /* entirely inside a microtile, this is easy! */
+      xf0 = xmin & (ART_UTILE_SIZE - 1);
+      yf0 = ymin & (ART_UTILE_SIZE - 1);
+      xf1 = (xmaxf & (ART_UTILE_SIZE - 1)) + xmaxc - xmaxf;
+      yf1 = (ymaxf & (ART_UTILE_SIZE - 1)) + ymaxc - ymaxf;
+
+      ix = yt0 * uta->width + xt0;
+      bb = uta->utiles[ix];
+      if (bb == 0)
+	bb = ART_UTA_BBOX_CONS(xf0, yf0, xf1, yf1);
+      else
+	bb = ART_UTA_BBOX_CONS(MIN(ART_UTA_BBOX_X0(bb), xf0),
+			   MIN(ART_UTA_BBOX_Y0(bb), yf0),
+			   MAX(ART_UTA_BBOX_X1(bb), xf1),
+			   MAX(ART_UTA_BBOX_Y1(bb), yf1));
+      uta->utiles[ix] = bb;
+    }
+  else
+    {
+      double dx, dy;
+      int sx, sy;
+
+      dx = x1 - x0;
+      dy = y1 - y0;
+      sx = dx > 0 ? 1 : dx < 0 ? -1 : 0;
+      sy = dy > 0 ? 1 : dy < 0 ? -1 : 0;
+      if (ymin == ymaxf)
+	{
+	  /* special case horizontal (dx/dy slope would be infinite) */
+	  xf0 = xmin & (ART_UTILE_SIZE - 1);
+	  yf0 = ymin & (ART_UTILE_SIZE - 1);
+	  xf1 = (xmaxf & (ART_UTILE_SIZE - 1)) + xmaxc - xmaxf;
+	  yf1 = (ymaxf & (ART_UTILE_SIZE - 1)) + ymaxc - ymaxf;
+
+	  ix = yt0 * uta->width + xt0;
+	  ix1 = yt0 * uta->width + xt1;
+	  while (ix != ix1)
+	    {
+	      bb = uta->utiles[ix];
+	      if (bb == 0)
+		bb = ART_UTA_BBOX_CONS(xf0, yf0, ART_UTILE_SIZE, yf1);
+	      else
+		bb = ART_UTA_BBOX_CONS(MIN(ART_UTA_BBOX_X0(bb), xf0),
+				   MIN(ART_UTA_BBOX_Y0(bb), yf0),
+				   ART_UTILE_SIZE,
+				   MAX(ART_UTA_BBOX_Y1(bb), yf1));
+	      uta->utiles[ix] = bb;
+	      xf0 = 0;
+	      ix++;
+	    }
+	  bb = uta->utiles[ix];
+	  if (bb == 0)
+	    bb = ART_UTA_BBOX_CONS(0, yf0, xf1, yf1);
+	  else
+	    bb = ART_UTA_BBOX_CONS(0,
+			       MIN(ART_UTA_BBOX_Y0(bb), yf0),
+			       MAX(ART_UTA_BBOX_X1(bb), xf1),
+			       MAX(ART_UTA_BBOX_Y1(bb), yf1));
+	  uta->utiles[ix] = bb;
+	}
+      else
+	{
+	  /* Do a Bresenham-style traversal of the line */
+	  double dx_dy;
+	  double x, y;
+	  double xn, yn;
+
+	  /* normalize coordinates to uta origin */
+	  x0 -= uta->x0 << ART_UTILE_SHIFT;
+	  y0 -= uta->y0 << ART_UTILE_SHIFT;
+	  x1 -= uta->x0 << ART_UTILE_SHIFT;
+	  y1 -= uta->y0 << ART_UTILE_SHIFT;
+	  if (dy < 0)
+	    {
+	      double tmp;
+
+	      tmp = x0;
+	      x0 = x1;
+	      x1 = tmp;
+
+	      tmp = y0;
+	      y0 = y1;
+	      y1 = tmp;
+
+	      dx = -dx;
+	      sx = -sx;
+	      dy = -dy;
+	      /* we leave sy alone, because it would always be 1,
+		 and we need it for the rbuf stuff. */
+	    }
+	  xt0 = ((int)floor (x0) >> ART_UTILE_SHIFT);
+	  xt1 = ((int)floor (x1) >> ART_UTILE_SHIFT);
+	  /* now [xy]0 is above [xy]1 */
+
+	  ix = yt0 * uta->width + xt0;
+	  ix1 = yt1 * uta->width + xt1;
+#ifdef VERBOSE
+	  printf ("%% ix = %d,%d; ix1 = %d,%d\n", xt0, yt0, xt1, yt1);
+#endif
+
+	  dx_dy = dx / dy;
+	  x = x0;
+	  y = y0;
+	  while (ix != ix1)
+	    {
+	      int dix;
+
+	      /* figure out whether next crossing is horizontal or vertical */
+#ifdef VERBOSE
+	      printf ("%% %d,%d\n", xt0, yt0);
+#endif
+	      yn = (yt0 + 1) << ART_UTILE_SHIFT;
+
+	      /* xn is the intercept with bottom edge of this tile. The
+		 following expression is careful to result in exactly
+		 x1 when yn = y1. */
+	      xn = x1 + dx_dy * (yn - y1);
+
+	      if (xt0 != (int)floor (xn) >> ART_UTILE_SHIFT)
+		{
+		  /* horizontal crossing */
+		  xt0 += sx;
+		  dix = sx;
+		  if (dx > 0)
+		    {
+		      xn = xt0 << ART_UTILE_SHIFT;
+		      yn = y0 + (xn - x0) / dx_dy;
+
+		      xf0 = (int)floor (x) & (ART_UTILE_SIZE - 1);
+		      xf1 = ART_UTILE_SIZE;
+		    }
+		  else
+		    {
+		      xn = (xt0 + 1) << ART_UTILE_SHIFT;
+		      yn = y0 + (xn - x0) / dx_dy;
+
+		      xf0 = 0;
+		      xmaxc = (int)ceil (x);
+		      xf1 = xmaxc - ((xt0 + 1) << ART_UTILE_SHIFT);
+		    }
+		  ymaxf = (int)floor (yn);
+		  ymaxc = (int)ceil (yn);
+		  yf1 = (ymaxf & (ART_UTILE_SIZE - 1)) + ymaxc - ymaxf;
+		}
+	      else
+		{
+		  /* vertical crossing */
+		  dix = uta->width;
+		  xf0 = (int)floor (MIN(x, xn)) & (ART_UTILE_SIZE - 1);
+		  xmax = MAX(x, xn);
+		  xmaxc = (int)ceil (xmax);
+		  xf1 = xmaxc - (xt0 << ART_UTILE_SHIFT);
+		  yf1 = ART_UTILE_SIZE;
+
+		  if (rbuf != NULL)
+		    rbuf[yt0 * rbuf_rowstride + xt0] += sy;
+
+		  yt0++;
+		}
+	      yf0 = (int)floor (y) & (ART_UTILE_SIZE - 1);
+	      bb = uta->utiles[ix];
+	      if (bb == 0)
+		bb = ART_UTA_BBOX_CONS(xf0, yf0, xf1, yf1);
+	      else
+		bb = ART_UTA_BBOX_CONS(MIN(ART_UTA_BBOX_X0(bb), xf0),
+				       MIN(ART_UTA_BBOX_Y0(bb), yf0),
+				       MAX(ART_UTA_BBOX_X1(bb), xf1),
+				       MAX(ART_UTA_BBOX_Y1(bb), yf1));
+	      uta->utiles[ix] = bb;
+
+	      x = xn;
+	      y = yn;
+	      ix += dix;
+	    }
+	  xmax = MAX(x, x1);
+	  xmaxc = ceil (xmax);
+	  ymaxc = ceil (y1);
+	  xf0 = (int)floor (MIN(x1, x)) & (ART_UTILE_SIZE - 1);
+	  yf0 = (int)floor (y) & (ART_UTILE_SIZE - 1);
+	  xf1 = xmaxc - (xt0 << ART_UTILE_SHIFT);
+	  yf1 = ymaxc - (yt0 << ART_UTILE_SHIFT);
+	  bb = uta->utiles[ix];
+	  if (bb == 0)
+	    bb = ART_UTA_BBOX_CONS(xf0, yf0, xf1, yf1);
+	  else
+	    bb = ART_UTA_BBOX_CONS(MIN(ART_UTA_BBOX_X0(bb), xf0),
+				   MIN(ART_UTA_BBOX_Y0(bb), yf0),
+				   MAX(ART_UTA_BBOX_X1(bb), xf1),
+				   MAX(ART_UTA_BBOX_Y1(bb), yf1));
+	  uta->utiles[ix] = bb;
+	}
+    }
+}
+
+/**
+ * art_uta_from_vpath: Generate uta covering a vpath.
+ * @vec: The source vpath.
+ *
+ * Generates a uta covering @vec. The resulting uta is of course
+ * approximate, ie it may cover more pixels than covered by @vec.
+ *
+ * Return value: the new uta.
+ **/
+ArtUta *
+art_uta_from_vpath (const ArtVpath *vec)
+{
+  ArtUta *uta;
+  ArtIRect bbox;
+  int *rbuf;
+  int i;
+  double x, y;
+  int sum;
+  int xt, yt;
+  ArtUtaBbox *utiles;
+  ArtUtaBbox bb;
+  int width;
+  int height;
+  int ix;
+
+  art_vpath_bbox_irect (vec, &bbox);
+
+  uta = art_uta_new_coords (bbox.x0, bbox.y0, bbox.x1, bbox.y1);
+
+  width = uta->width;
+  height = uta->height;
+  utiles = uta->utiles;
+
+  rbuf = art_new (int, width * height);
+  for (i = 0; i < width * height; i++)
+    rbuf[i] = 0;
+
+  x = 0;
+  y = 0;
+  for (i = 0; vec[i].code != ART_END; i++)
+    {
+      switch (vec[i].code)
+	{
+	case ART_MOVETO:
+	  x = vec[i].x;
+	  y = vec[i].y;
+	  break;
+	case ART_LINETO:
+	  art_uta_add_line (uta, vec[i].x, vec[i].y, x, y, rbuf, width);
+	  x = vec[i].x;
+	  y = vec[i].y;
+	  break;
+	default:
+	  /* this shouldn't happen */
+          art_free (rbuf);
+          art_free (uta);
+          return NULL;
+	}
+    }
+
+  /* now add in the filling from rbuf */
+  ix = 0;
+  for (yt = 0; yt < height; yt++)
+    {
+      sum = 0;
+      for (xt = 0; xt < width; xt++)
+	{
+	  sum += rbuf[ix];
+	  /* Nonzero winding rule - others are possible, but hardly
+	     worth it. */
+	  if (sum != 0)
+	    {
+	      bb = utiles[ix];
+	      bb &= 0xffff0000;
+	      bb |= (ART_UTILE_SIZE << 8) | ART_UTILE_SIZE;
+	      utiles[ix] = bb;
+	      if (xt != width - 1)
+		{
+		  bb = utiles[ix + 1];
+		  bb &= 0xffff00;
+		  bb |= ART_UTILE_SIZE;
+		  utiles[ix + 1] = bb;
+		}
+	      if (yt != height - 1)
+		{
+		  bb = utiles[ix + width];
+		  bb &= 0xff0000ff;
+		  bb |= ART_UTILE_SIZE << 8;
+		  utiles[ix + width] = bb;
+		  if (xt != width - 1)
+		    {
+		      utiles[ix + width + 1] &= 0xffff;
+		    }
+		}
+	    }
+	  ix++;
+	}
+    }
+
+  art_free (rbuf);
+
+  return uta;
+}

art_uta_vpath.h

@@ -0,0 +1,50 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_UTA_VPATH_H__
+#define __ART_UTA_VPATH_H__
+
+/* Basic data structures and constructors for microtile arrays */
+
+#ifdef LIBART_COMPILATION
+#include "art_uta.h"
+#include "art_vpath.h"
+#else
+#include <libart_lgpl/art_uta.h>
+#include <libart_lgpl/art_vpath.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+ArtUta *
+art_uta_from_vpath (const ArtVpath *vec);
+
+/* This is a private function: */
+void
+art_uta_add_line (ArtUta *uta, double x0, double y0, double x1, double y1,
+		  int *rbuf, int rbuf_rowstride);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_UTA_VPATH_H__ */
+

art_vpath.c

@@ -0,0 +1,241 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998-2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* Basic constructors and operations for vector paths */
+
+#include "config.h"
+#include "art_vpath.h"
+
+#include <math.h>
+#include <stdlib.h>
+
+#include "art_misc.h"
+
+#include "art_rect.h"
+
+/**
+ * art_vpath_add_point: Add point to vpath.
+ * @p_vpath: Where the pointer to the #ArtVpath structure is stored.
+ * @pn_points: Pointer to the number of points in *@p_vpath.
+ * @pn_points_max: Pointer to the number of points allocated.
+ * @code: The pathcode for the new point.
+ * @x: The X coordinate of the new point.
+ * @y: The Y coordinate of the new point.
+ *
+ * Adds a new point to *@p_vpath, reallocating and updating *@p_vpath
+ * and *@pn_points_max as necessary. *@pn_points is incremented.
+ *
+ * This routine always adds the point after all points already in the
+ * vpath. Thus, it should be called in the order the points are
+ * desired.
+ **/
+void
+art_vpath_add_point (ArtVpath **p_vpath, int *pn_points, int *pn_points_max,
+		     ArtPathcode code, double x, double y)
+{
+  int i;
+
+  i = (*pn_points)++;
+  if (i == *pn_points_max)
+    art_expand (*p_vpath, ArtVpath, *pn_points_max);
+  (*p_vpath)[i].code = code;
+  (*p_vpath)[i].x = x;
+  (*p_vpath)[i].y = y;
+}
+
+/* number of steps should really depend on radius. */
+#define CIRCLE_STEPS 128
+
+/**
+ * art_vpath_new_circle: Create a new circle.
+ * @x: X coordinate of center.
+ * @y: Y coordinate of center.
+ * @r: radius.
+ *
+ * Creates a new polygon closely approximating a circle with center
+ * (@x, @y) and radius @r. Currently, the number of points used in the
+ * approximation is fixed, but that will probably change.
+ *
+ * Return value: The newly created #ArtVpath.
+ **/
+ArtVpath *
+art_vpath_new_circle (double x, double y, double r)
+{
+  int i;
+  ArtVpath *vec;
+  double theta;
+
+  vec = art_new (ArtVpath, CIRCLE_STEPS + 2);
+
+  for (i = 0; i < CIRCLE_STEPS + 1; i++)
+    {
+      vec[i].code = i ? ART_LINETO : ART_MOVETO;
+      theta = (i & (CIRCLE_STEPS - 1)) * (M_PI * 2.0 / CIRCLE_STEPS);
+      vec[i].x = x + r * cos (theta);
+      vec[i].y = y - r * sin (theta);
+    }
+  vec[i].code = ART_END;
+
+  return vec;
+}
+
+/**
+ * art_vpath_affine_transform: Affine transform a vpath.
+ * @src: Source vpath to transform.
+ * @matrix: Affine transform.
+ *
+ * Computes the affine transform of the vpath, using @matrix as the
+ * transform. @matrix is stored in the same format as PostScript, ie.
+ * x' = @matrix[0] * x + @matrix[2] * y + @matrix[4]
+ * y' = @matrix[1] * x + @matrix[3] * y + @matrix[5]
+ *
+ * Return value: the newly allocated vpath resulting from the transform.
+**/
+ArtVpath *
+art_vpath_affine_transform (const ArtVpath *src, const double matrix[6])
+{
+  int i;
+  int size;
+  ArtVpath *new;
+  double x, y;
+
+  for (i = 0; src[i].code != ART_END; i++);
+  size = i;
+
+  new = art_new (ArtVpath, size + 1);
+
+  for (i = 0; i < size; i++)
+    {
+      new[i].code = src[i].code;
+      x = src[i].x;
+      y = src[i].y;
+      new[i].x = matrix[0] * x + matrix[2] * y + matrix[4];
+      new[i].y = matrix[1] * x + matrix[3] * y + matrix[5];
+    }
+  new[i].code = ART_END;
+
+  return new;
+}
+
+/**
+ * art_vpath_bbox_drect: Determine bounding box of vpath.
+ * @vec: Source vpath.
+ * @drect: Where to store bounding box.
+ *
+ * Determines bounding box of @vec, and stores it in @drect.
+ **/
+void
+art_vpath_bbox_drect (const ArtVpath *vec, ArtDRect *drect)
+{
+  int i;
+  double x0, y0, x1, y1;
+
+  if (vec[0].code == ART_END)
+    {
+      x0 = y0 = x1 = y1 = 0;
+    }
+  else
+    {
+      x0 = x1 = vec[0].x;
+      y0 = y1 = vec[0].y;
+      for (i = 1; vec[i].code != ART_END; i++)
+	{
+	  if (vec[i].x < x0) x0 = vec[i].x;
+	  if (vec[i].x > x1) x1 = vec[i].x;
+	  if (vec[i].y < y0) y0 = vec[i].y;
+	  if (vec[i].y > y1) y1 = vec[i].y;
+	}
+    }
+  drect->x0 = x0;
+  drect->y0 = y0;
+  drect->x1 = x1;
+  drect->y1 = y1;
+}
+
+/**
+ * art_vpath_bbox_irect: Determine integer bounding box of vpath.
+ * @vec: Source vpath.
+ * idrect: Where to store bounding box.
+ *
+ * Determines integer bounding box of @vec, and stores it in @irect.
+ **/
+void
+art_vpath_bbox_irect (const ArtVpath *vec, ArtIRect *irect)
+{
+  ArtDRect drect;
+
+  art_vpath_bbox_drect (vec, &drect);
+  art_drect_to_irect (irect, &drect);
+}
+
+#define PERTURBATION 2e-3
+
+/**
+ * art_vpath_perturb: Perturb each point in vpath by small random amount.
+ * @src: Source vpath.
+ *
+ * Perturbs each of the points by a small random amount. This is
+ * helpful for cheating in cases when algorithms haven't attained
+ * numerical stability yet.
+ *
+ * Return value: Newly allocated vpath containing perturbed @src.
+ **/ 
+ArtVpath *
+art_vpath_perturb (ArtVpath *src)
+{
+  int i;
+  int size;
+  ArtVpath *new;
+  double x, y;
+  double x_start, y_start;
+  int open;
+
+  for (i = 0; src[i].code != ART_END; i++);
+  size = i;
+
+  new = art_new (ArtVpath, size + 1);
+
+  x_start = 0;
+  y_start = 0;
+  open = 0;
+  for (i = 0; i < size; i++)
+    {
+      new[i].code = src[i].code;
+      x = src[i].x + (PERTURBATION * rand ()) / RAND_MAX - PERTURBATION * 0.5;
+      y = src[i].y + (PERTURBATION * rand ()) / RAND_MAX - PERTURBATION * 0.5;
+      if (src[i].code == ART_MOVETO)
+	{
+	  x_start = x;
+	  y_start = y;
+	  open = 0;
+	}
+      else if (src[i].code == ART_MOVETO_OPEN)
+	open = 1;
+      if (!open && (i + 1 == size || src[i + 1].code != ART_LINETO))
+	{
+	  x = x_start;
+	  y = y_start;
+	}
+      new[i].x = x;
+      new[i].y = y;
+    }
+  new[i].code = ART_END;
+
+  return new;
+}

art_vpath.h

@@ -0,0 +1,71 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_VPATH_H__
+#define __ART_VPATH_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_rect.h"
+#include "art_pathcode.h"
+#else
+#include <libart_lgpl/art_rect.h>
+#include <libart_lgpl/art_pathcode.h>
+#endif
+
+/* Basic data structures and constructors for simple vector paths */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef struct _ArtVpath ArtVpath;
+
+/* CURVETO is not allowed! */
+struct _ArtVpath {
+  ArtPathcode code;
+  double x;
+  double y;
+};
+
+/* Some of the functions need to go into their own modules */
+
+void
+art_vpath_add_point (ArtVpath **p_vpath, int *pn_points, int *pn_points_max,
+		     ArtPathcode code, double x, double y);
+
+ArtVpath *
+art_vpath_new_circle (double x, double y, double r);
+
+ArtVpath *
+art_vpath_affine_transform (const ArtVpath *src, const double matrix[6]);
+
+void
+art_vpath_bbox_drect (const ArtVpath *vec, ArtDRect *drect);
+
+void
+art_vpath_bbox_irect (const ArtVpath *vec, ArtIRect *irect);
+
+ArtVpath *
+art_vpath_perturb (ArtVpath *src);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_VPATH_H__ */

art_vpath_bpath.c

@@ -0,0 +1,328 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* Basic constructors and operations for bezier paths */
+
+#include "config.h"
+#include "art_vpath_bpath.h"
+
+#include <math.h>
+
+#include "art_misc.h"
+
+#include "art_bpath.h"
+#include "art_vpath.h"
+
+/* p must be allocated 2^level points. */
+
+/* level must be >= 1 */
+ArtPoint *
+art_bezier_to_vec (double x0, double y0,
+		   double x1, double y1,
+		   double x2, double y2,
+		   double x3, double y3,
+		   ArtPoint *p,
+		   int level)
+{
+  double x_m, y_m;
+
+#ifdef VERBOSE
+  printf ("bezier_to_vec: %g,%g %g,%g %g,%g %g,%g %d\n",
+	  x0, y0, x1, y1, x2, y2, x3, y3, level);
+#endif
+  if (level == 1) {
+    x_m = (x0 + 3 * (x1 + x2) + x3) * 0.125;
+    y_m = (y0 + 3 * (y1 + y2) + y3) * 0.125;
+    p->x = x_m;
+    p->y = y_m;
+    p++;
+    p->x = x3;
+    p->y = y3;
+    p++;
+#ifdef VERBOSE
+    printf ("-> (%g, %g) -> (%g, %g)\n", x_m, y_m, x3, y3);
+#endif
+  } else {
+    double xa1, ya1;
+    double xa2, ya2;
+    double xb1, yb1;
+    double xb2, yb2;
+
+    xa1 = (x0 + x1) * 0.5;
+    ya1 = (y0 + y1) * 0.5;
+    xa2 = (x0 + 2 * x1 + x2) * 0.25;
+    ya2 = (y0 + 2 * y1 + y2) * 0.25;
+    xb1 = (x1 + 2 * x2 + x3) * 0.25;
+    yb1 = (y1 + 2 * y2 + y3) * 0.25;
+    xb2 = (x2 + x3) * 0.5;
+    yb2 = (y2 + y3) * 0.5;
+    x_m = (xa2 + xb1) * 0.5;
+    y_m = (ya2 + yb1) * 0.5;
+#ifdef VERBOSE
+    printf ("%g,%g %g,%g %g,%g %g,%g\n", xa1, ya1, xa2, ya2,
+	    xb1, yb1, xb2, yb2);
+#endif
+    p = art_bezier_to_vec (x0, y0, xa1, ya1, xa2, ya2, x_m, y_m, p, level - 1);
+    p = art_bezier_to_vec (x_m, y_m, xb1, yb1, xb2, yb2, x3, y3, p, level - 1);
+  }
+  return p;
+}
+
+#define RENDER_LEVEL 4
+#define RENDER_SIZE (1 << (RENDER_LEVEL))
+
+/**
+ * art_vpath_render_bez: Render a bezier segment into the vpath. 
+ * @p_vpath: Where the pointer to the #ArtVpath structure is stored.
+ * @pn_points: Pointer to the number of points in *@p_vpath.
+ * @pn_points_max: Pointer to the number of points allocated.
+ * @x0: X coordinate of starting bezier point.
+ * @y0: Y coordinate of starting bezier point.
+ * @x1: X coordinate of first bezier control point.
+ * @y1: Y coordinate of first bezier control point.
+ * @x2: X coordinate of second bezier control point.
+ * @y2: Y coordinate of second bezier control point.
+ * @x3: X coordinate of ending bezier point.
+ * @y3: Y coordinate of ending bezier point.
+ * @flatness: Flatness control.
+ *
+ * Renders a bezier segment into the vector path, reallocating and
+ * updating *@p_vpath and *@pn_vpath_max as necessary. *@pn_vpath is
+ * incremented by the number of vector points added.
+ *
+ * This step includes (@x0, @y0) but not (@x3, @y3).
+ *
+ * The @flatness argument guides the amount of subdivision. The Adobe
+ * PostScript reference manual defines flatness as the maximum
+ * deviation between the any point on the vpath approximation and the
+ * corresponding point on the "true" curve, and we follow this
+ * definition here. A value of 0.25 should ensure high quality for aa
+ * rendering.
+**/
+static void
+art_vpath_render_bez (ArtVpath **p_vpath, int *pn, int *pn_max,
+		      double x0, double y0,
+		      double x1, double y1,
+		      double x2, double y2,
+		      double x3, double y3,
+		      double flatness)
+{
+  double x3_0, y3_0;
+  double z3_0_dot;
+  double z1_dot, z2_dot;
+  double z1_perp, z2_perp;
+  double max_perp_sq;
+
+  double x_m, y_m;
+  double xa1, ya1;
+  double xa2, ya2;
+  double xb1, yb1;
+  double xb2, yb2;
+
+  /* It's possible to optimize this routine a fair amount.
+
+     First, once the _dot conditions are met, they will also be met in
+     all further subdivisions. So we might recurse to a different
+     routine that only checks the _perp conditions.
+
+     Second, the distance _should_ decrease according to fairly
+     predictable rules (a factor of 4 with each subdivision). So it might
+     be possible to note that the distance is within a factor of 4 of
+     acceptable, and subdivide once. But proving this might be hard.
+
+     Third, at the last subdivision, x_m and y_m can be computed more
+     expeditiously (as in the routine above).
+
+     Finally, if we were able to subdivide by, say 2 or 3, this would
+     allow considerably finer-grain control, i.e. fewer points for the
+     same flatness tolerance. This would speed things up downstream.
+
+     In any case, this routine is unlikely to be the bottleneck. It's
+     just that I have this undying quest for more speed...
+
+  */
+
+  x3_0 = x3 - x0;
+  y3_0 = y3 - y0;
+
+  /* z3_0_dot is dist z0-z3 squared */
+  z3_0_dot = x3_0 * x3_0 + y3_0 * y3_0;
+
+  if (z3_0_dot < 0.001)
+    {
+      /* if start and end point are almost identical, the flatness tests
+       * don't work properly, so fall back on testing whether both of
+       * the other two control points are the same as the start point,
+       * too.
+       */
+      if (hypot(x1 - x0, y1 - y0) < 0.001
+	  && hypot(x2 - x0, y2 - y0) < 0.001)
+	  goto nosubdivide;
+      else
+	  goto subdivide;
+    }
+
+  /* we can avoid subdivision if:
+
+     z1 has distance no more than flatness from the z0-z3 line
+
+     z1 is no more z0'ward than flatness past z0-z3
+
+     z1 is more z0'ward than z3'ward on the line traversing z0-z3
+
+     and correspondingly for z2 */
+
+  /* perp is distance from line, multiplied by dist z0-z3 */
+  max_perp_sq = flatness * flatness * z3_0_dot;
+
+  z1_perp = (y1 - y0) * x3_0 - (x1 - x0) * y3_0;
+  if (z1_perp * z1_perp > max_perp_sq)
+    goto subdivide;
+
+  z2_perp = (y3 - y2) * x3_0 - (x3 - x2) * y3_0;
+  if (z2_perp * z2_perp > max_perp_sq)
+    goto subdivide;
+
+  z1_dot = (x1 - x0) * x3_0 + (y1 - y0) * y3_0;
+  if (z1_dot < 0 && z1_dot * z1_dot > max_perp_sq)
+    goto subdivide;
+
+  z2_dot = (x3 - x2) * x3_0 + (y3 - y2) * y3_0;
+  if (z2_dot < 0 && z2_dot * z2_dot > max_perp_sq)
+    goto subdivide;
+
+  if (z1_dot + z1_dot > z3_0_dot)
+    goto subdivide;
+
+  if (z2_dot + z2_dot > z3_0_dot)
+    goto subdivide;
+
+      
+ nosubdivide:
+  /* don't subdivide */
+  art_vpath_add_point (p_vpath, pn, pn_max,
+		       ART_LINETO, x3, y3);
+  return;
+
+ subdivide:
+
+  xa1 = (x0 + x1) * 0.5;
+  ya1 = (y0 + y1) * 0.5;
+  xa2 = (x0 + 2 * x1 + x2) * 0.25;
+  ya2 = (y0 + 2 * y1 + y2) * 0.25;
+  xb1 = (x1 + 2 * x2 + x3) * 0.25;
+  yb1 = (y1 + 2 * y2 + y3) * 0.25;
+  xb2 = (x2 + x3) * 0.5;
+  yb2 = (y2 + y3) * 0.5;
+  x_m = (xa2 + xb1) * 0.5;
+  y_m = (ya2 + yb1) * 0.5;
+#ifdef VERBOSE
+  printf ("%g,%g %g,%g %g,%g %g,%g\n", xa1, ya1, xa2, ya2,
+	  xb1, yb1, xb2, yb2);
+#endif
+  art_vpath_render_bez (p_vpath, pn, pn_max,
+			x0, y0, xa1, ya1, xa2, ya2, x_m, y_m, flatness);
+  art_vpath_render_bez (p_vpath, pn, pn_max,
+			x_m, y_m, xb1, yb1, xb2, yb2, x3, y3, flatness);
+}
+
+/**
+ * art_bez_path_to_vec: Create vpath from bezier path.
+ * @bez: Bezier path.
+ * @flatness: Flatness control.
+ *
+ * Creates a vector path closely approximating the bezier path defined by
+ * @bez. The @flatness argument controls the amount of subdivision. In
+ * general, the resulting vpath deviates by at most @flatness pixels
+ * from the "ideal" path described by @bez.
+ *
+ * Return value: Newly allocated vpath.
+ **/
+ArtVpath *
+art_bez_path_to_vec (const ArtBpath *bez, double flatness)
+{
+  ArtVpath *vec;
+  int vec_n, vec_n_max;
+  int bez_index;
+  double x, y;
+
+  vec_n = 0;
+  vec_n_max = RENDER_SIZE;
+  vec = art_new (ArtVpath, vec_n_max);
+
+  /* Initialization is unnecessary because of the precondition that the
+     bezier path does not begin with LINETO or CURVETO, but is here
+     to make the code warning-free. */
+  x = 0;
+  y = 0;
+
+  bez_index = 0;
+  do
+    {
+#ifdef VERBOSE
+      printf ("%s %g %g\n",
+	      bez[bez_index].code == ART_CURVETO ? "curveto" :
+	      bez[bez_index].code == ART_LINETO ? "lineto" :
+	      bez[bez_index].code == ART_MOVETO ? "moveto" :
+	      bez[bez_index].code == ART_MOVETO_OPEN ? "moveto-open" :
+	      "end", bez[bez_index].x3, bez[bez_index].y3);
+#endif
+      /* make sure space for at least one more code */
+      if (vec_n >= vec_n_max)
+	art_expand (vec, ArtVpath, vec_n_max);
+      switch (bez[bez_index].code)
+	{
+	case ART_MOVETO_OPEN:
+	case ART_MOVETO:
+	case ART_LINETO:
+	  x = bez[bez_index].x3;
+	  y = bez[bez_index].y3;
+	  vec[vec_n].code = bez[bez_index].code;
+	  vec[vec_n].x = x;
+	  vec[vec_n].y = y;
+	  vec_n++;
+	  break;
+	case ART_END:
+	  vec[vec_n].code = bez[bez_index].code;
+	  vec[vec_n].x = 0;
+	  vec[vec_n].y = 0;
+	  vec_n++;
+	  break;
+	case ART_CURVETO:
+#ifdef VERBOSE
+	  printf ("%g,%g %g,%g %g,%g %g,%g\n", x, y,
+			 bez[bez_index].x1, bez[bez_index].y1,
+			 bez[bez_index].x2, bez[bez_index].y2,
+			 bez[bez_index].x3, bez[bez_index].y3);
+#endif
+	  art_vpath_render_bez (&vec, &vec_n, &vec_n_max,
+				x, y,
+				bez[bez_index].x1, bez[bez_index].y1,
+				bez[bez_index].x2, bez[bez_index].y2,
+				bez[bez_index].x3, bez[bez_index].y3,
+				flatness);
+	  x = bez[bez_index].x3;
+	  y = bez[bez_index].y3;
+	  break;
+	}
+    }
+  while (bez[bez_index++].code != ART_END);
+  return vec;
+}
+

art_vpath_bpath.h

@@ -0,0 +1,48 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_VPATH_BPATH_H__
+#define __ART_VPATH_BPATH_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_bpath.h"
+#include "art_vpath.h"
+#else
+#include <libart_lgpl/art_bpath.h>
+#include <libart_lgpl/art_vpath.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+ArtPoint *art_bezier_to_vec (double x0, double y0,
+			     double x1, double y1,
+			     double x2, double y2,
+			     double x3, double y3,
+			     ArtPoint *p,
+			     int level);
+
+ArtVpath *art_bez_path_to_vec (const ArtBpath *bez, double flatness);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_VPATH_BPATH_H__ */

art_vpath_dash.c

@@ -0,0 +1,200 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1999-2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* Apply a dash style to a vector path. */
+
+#include "config.h"
+#include "art_vpath_dash.h"
+
+#include <math.h>
+#include <stdlib.h>
+
+#include "art_misc.h"
+
+#include "art_vpath.h"
+
+
+/* Return the length of the largest subpath within vpath */
+static int
+art_vpath_dash_max_subpath (const ArtVpath *vpath)
+{
+  int max_subpath;
+  int i;
+  int start;
+
+  max_subpath = 0;
+  start = 0;
+  for (i = 0; vpath[i].code != ART_END; i++)
+    {
+      if (vpath[i].code == ART_MOVETO || vpath[i].code == ART_MOVETO_OPEN)
+	{
+	  if (i - start > max_subpath)
+	    max_subpath = i - start;
+	  start = i;
+	}
+    }
+  if (i - start > max_subpath)
+    max_subpath = i - start;
+
+  return max_subpath;
+}
+
+/**
+ * art_vpath_dash: Add dash style to vpath.
+ * @vpath: Original vpath.
+ * @dash: Dash style.
+ *
+ * Creates a new vpath that is the result of applying dash style @dash
+ * to @vpath.
+ *
+ * This implementation has two known flaws:
+ *
+ * First, it adds a spurious break at the beginning of the vpath. The
+ * only way I see to resolve this flaw is to run the state forward one
+ * dash break at the beginning, and fix up by looping back to the
+ * first dash break at the end. This is doable but of course adds some
+ * complexity.
+ *
+ * Second, it does not suppress output points that are within epsilon
+ * of each other.
+ *
+ * Return value: Newly created vpath.
+ **/
+ArtVpath *
+art_vpath_dash (const ArtVpath *vpath, const ArtVpathDash *dash)
+{
+  int max_subpath;
+  double *dists;
+  ArtVpath *result;
+  int n_result, n_result_max;
+  int start, end;
+  int i;
+  double total_dist;
+
+  /* state while traversing dasharray - offset is offset of current dash
+     value, toggle is 0 for "off" and 1 for "on", and phase is the distance
+     in, >= 0, < dash->dash[offset]. */
+  int offset, toggle;
+  double phase;
+
+  /* initial values */
+  int offset_init, toggle_init;
+  double phase_init;
+
+  max_subpath = art_vpath_dash_max_subpath (vpath);
+  dists = art_new (double, max_subpath);
+
+  n_result = 0;
+  n_result_max = 16;
+  result = art_new (ArtVpath, n_result_max);
+
+  /* determine initial values of dash state */
+  toggle_init = 1;
+  offset_init = 0;
+  phase_init = dash->offset;
+  while (phase_init >= dash->dash[offset_init])
+    {
+      toggle_init = !toggle_init;
+      phase_init -= dash->dash[offset_init];
+      offset_init++;
+      if (offset_init == dash->n_dash)
+	offset_init = 0;
+    }
+
+  for (start = 0; vpath[start].code != ART_END; start = end)
+    {
+      for (end = start + 1; vpath[end].code == ART_LINETO; end++);
+      /* subpath is [start..end) */
+      total_dist = 0;
+      for (i = start; i < end - 1; i++)
+	{
+	  double dx, dy;
+
+	  dx = vpath[i + 1].x - vpath[i].x;
+	  dy = vpath[i + 1].y - vpath[i].y;
+	  dists[i - start] = sqrt (dx * dx + dy * dy);
+	  total_dist += dists[i - start];
+	}
+      if (total_dist <= dash->dash[offset_init] - phase_init)
+	{
+	  /* subpath fits entirely within first dash */
+	  if (toggle_init)
+	    {
+	      for (i = start; i < end; i++)
+		art_vpath_add_point (&result, &n_result, &n_result_max,
+				     vpath[i].code, vpath[i].x, vpath[i].y);
+	    }
+	}
+      else
+	{
+	  /* subpath is composed of at least one dash - thus all
+	     generated pieces are open */
+	  double dist;
+
+	  phase = phase_init;
+	  offset = offset_init;
+	  toggle = toggle_init;
+	  dist = 0;
+	  i = start;
+	  if (toggle)
+	    art_vpath_add_point (&result, &n_result, &n_result_max,
+				 ART_MOVETO_OPEN, vpath[i].x, vpath[i].y);
+	  while (i != end - 1)
+	    {
+	      if (dists[i - start] - dist > dash->dash[offset] - phase)
+		{
+		  /* dash boundary is next */
+		  double a;
+		  double x, y;
+
+		  dist += dash->dash[offset] - phase;
+		  a = dist / dists[i - start];
+		  x = vpath[i].x + a * (vpath[i + 1].x - vpath[i].x);
+		  y = vpath[i].y + a * (vpath[i + 1].y - vpath[i].y);
+		  art_vpath_add_point (&result, &n_result, &n_result_max,
+				       toggle ? ART_LINETO : ART_MOVETO_OPEN,
+				       x, y);
+		  /* advance to next dash */
+		  toggle = !toggle;
+		  phase = 0;
+		  offset++;
+		  if (offset == dash->n_dash)
+		    offset = 0;
+		}
+	      else
+		{
+		  /* end of line in vpath is next */
+		  phase += dists[i - start] - dist;
+		  i++;
+		  dist = 0;
+		  if (toggle)
+		    art_vpath_add_point (&result, &n_result, &n_result_max,
+					 ART_LINETO, vpath[i].x, vpath[i].y);
+		}
+	    }
+	}
+    }
+
+  art_vpath_add_point (&result, &n_result, &n_result_max,
+		       ART_END, 0, 0);
+
+  art_free (dists);
+
+  return result;
+}

art_vpath_dash.h

@@ -0,0 +1,50 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1999 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_VPATH_DASH_H__
+#define __ART_VPATH_DASH_H__
+
+/* Apply a dash style to a vector path. */
+
+#ifdef LIBART_COMPILATION
+#include "art_vpath.h"
+#else
+#include <libart_lgpl/art_vpath.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef struct _ArtVpathDash ArtVpathDash;
+
+struct _ArtVpathDash {
+  double offset;
+  int n_dash;
+  double *dash;
+};
+
+ArtVpath *
+art_vpath_dash (const ArtVpath *vpath, const ArtVpathDash *dash);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_VPATH_DASH_H__ */

art_vpath_svp.c

@@ -0,0 +1,196 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998-2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* "Unsort" a sorted vector path into an ordinary vector path. */
+
+#include "config.h"
+#include "art_vpath_svp.h"
+
+#include <stdio.h> /* for printf - debugging */
+#include "art_misc.h"
+
+#include "art_vpath.h"
+#include "art_svp.h"
+
+typedef struct _ArtVpathSVPEnd ArtVpathSVPEnd;
+
+struct _ArtVpathSVPEnd {
+  int seg_num;
+  int which; /* 0 = top, 1 = bottom */
+  double x, y;
+};
+
+#define EPSILON 1e-6
+
+static int
+art_vpath_svp_point_compare (double x1, double y1, double x2, double y2)
+{
+  if (y1 - EPSILON > y2) return 1;
+  if (y1 + EPSILON < y2) return -1;
+  if (x1 - EPSILON > x2) return 1;
+  if (x1 + EPSILON < x2) return -1;
+  return 0;
+}
+
+static int
+art_vpath_svp_compare (const void *s1, const void *s2)
+{
+  const ArtVpathSVPEnd *e1 = s1;
+  const ArtVpathSVPEnd *e2 = s2;
+
+  return art_vpath_svp_point_compare (e1->x, e1->y, e2->x, e2->y);
+}
+
+/* Convert from sorted vector path representation into regular
+   vector path representation.
+
+   Status of this routine:
+
+   Basic correctness: Only works with closed paths.
+
+   Numerical stability: Not known to work when more than two segments
+   meet at a point.
+
+   Speed: Should be pretty good.
+
+   Precision: Does not degrade precision.
+
+*/
+/**
+ * art_vpath_from_svp: Convert from svp to vpath form.
+ * @svp: Original #ArtSVP.
+ *
+ * Converts the sorted vector path @svp into standard vpath form.
+ *
+ * Return value: the newly allocated vpath.
+ **/
+ArtVpath *
+art_vpath_from_svp (const ArtSVP *svp)
+{
+  int n_segs = svp->n_segs;
+  ArtVpathSVPEnd *ends;
+  ArtVpath *new;
+  int *visited;
+  int n_new, n_new_max;
+  int i, k;
+  int j = 0; /* Quiet compiler */
+  int seg_num;
+  int first;
+  double last_x, last_y;
+  int n_points;
+  int pt_num;
+
+  last_x = 0; /* to eliminate "uninitialized" warning */
+  last_y = 0;
+
+  ends = art_new (ArtVpathSVPEnd, n_segs * 2);
+  for (i = 0; i < svp->n_segs; i++)
+    {
+      int lastpt;
+
+      ends[i * 2].seg_num = i;
+      ends[i * 2].which = 0;
+      ends[i * 2].x = svp->segs[i].points[0].x;
+      ends[i * 2].y = svp->segs[i].points[0].y;
+
+      lastpt = svp->segs[i].n_points - 1;
+      ends[i * 2 + 1].seg_num = i;
+      ends[i * 2 + 1].which = 1;
+      ends[i * 2 + 1].x = svp->segs[i].points[lastpt].x;
+      ends[i * 2 + 1].y = svp->segs[i].points[lastpt].y;
+    }
+  qsort (ends, n_segs * 2, sizeof (ArtVpathSVPEnd), art_vpath_svp_compare);
+
+  n_new = 0;
+  n_new_max = 16; /* I suppose we _could_ estimate this from traversing
+		     the svp, so we don't have to reallocate */
+  new = art_new (ArtVpath, n_new_max);
+
+  visited = art_new (int, n_segs);
+  for (i = 0; i < n_segs; i++)
+    visited[i] = 0;
+
+  first = 1;
+  for (i = 0; i < n_segs; i++)
+    {
+      if (!first)
+	{
+	  /* search for the continuation of the existing subpath */
+	  /* This could be a binary search (which is why we sorted, above) */
+	  for (j = 0; j < n_segs * 2; j++)
+	    {
+	      if (!visited[ends[j].seg_num] &&
+		  art_vpath_svp_point_compare (last_x, last_y,
+					       ends[j].x, ends[j].y) == 0)
+		break;
+	    }
+	  if (j == n_segs * 2)
+	    first = 1;
+	}
+      if (first)
+	{
+	  /* start a new subpath */
+	  for (j = 0; j < n_segs * 2; j++)
+	    if (!visited[ends[j].seg_num])
+	      break;
+	}
+      if (j == n_segs * 2)
+	{
+	  printf ("failure\n");
+	}
+      seg_num = ends[j].seg_num;
+      n_points = svp->segs[seg_num].n_points;
+      for (k = 0; k < n_points; k++)
+	{
+	  pt_num = svp->segs[seg_num].dir ? k : n_points - (1 + k);
+	  if (k == 0)
+	    {
+	      if (first)
+		{
+		  art_vpath_add_point (&new, &n_new, &n_new_max,
+				       ART_MOVETO,
+				       svp->segs[seg_num].points[pt_num].x,
+				       svp->segs[seg_num].points[pt_num].y);
+		}
+	    }
+	  else
+	    {
+	      art_vpath_add_point (&new, &n_new, &n_new_max,
+				   ART_LINETO,
+				   svp->segs[seg_num].points[pt_num].x,
+				   svp->segs[seg_num].points[pt_num].y);
+	      if (k == n_points - 1)
+		{
+		  last_x = svp->segs[seg_num].points[pt_num].x;
+		  last_y = svp->segs[seg_num].points[pt_num].y;
+		  /* to make more robust, check for meeting first_[xy],
+		     set first if so */
+		}
+	    }
+	  first = 0;
+	}
+      visited[seg_num] = 1;
+    }
+
+  art_vpath_add_point (&new, &n_new, &n_new_max,
+		       ART_END, 0, 0);
+  art_free (visited);
+  art_free (ends);
+  return new;
+}

art_vpath_svp.h

@@ -0,0 +1,43 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __ART_VPATH_SVP_H__
+#define __ART_VPATH_SVP_H__
+
+/* "Unsort" a sorted vector path into an ordinary vector path. */
+
+#ifdef LIBART_COMPILATION
+#include "art_svp.h"
+#include "art_vpath.h"
+#else
+#include <libart_lgpl/art_svp.h>
+#include <libart_lgpl/art_vpath.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+ArtVpath *art_vpath_from_svp (const ArtSVP *svp);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_VPATH_SVP_H__ */

config.h.in

@@ -0,0 +1,109 @@
+/* config.h.in.  Generated from configure.in by autoheader.  */
+
+/* Define if building universal (internal helper macro) */
+#undef AC_APPLE_UNIVERSAL_BUILD
+
+/* Define to one of `_getb67', `GETB67', `getb67' for Cray-2 and Cray-YMP
+   systems. This function is required for `alloca.c' support on those systems.
+   */
+#undef CRAY_STACKSEG_END
+
+/* Define to 1 if using `alloca.c'. */
+#undef C_ALLOCA
+
+/* Define to 1 if you have `alloca', as a function or macro. */
+#undef HAVE_ALLOCA
+
+/* Define to 1 if you have <alloca.h> and it should be used (not on Ultrix).
+   */
+#undef HAVE_ALLOCA_H
+
+/* Define to 1 if you have the <dlfcn.h> header file. */
+#undef HAVE_DLFCN_H
+
+/* Define to 1 if you have the <inttypes.h> header file. */
+#undef HAVE_INTTYPES_H
+
+/* Define to 1 if you have the <memory.h> header file. */
+#undef HAVE_MEMORY_H
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#undef HAVE_STDINT_H
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#undef HAVE_STDLIB_H
+
+/* Define to 1 if you have the <strings.h> header file. */
+#undef HAVE_STRINGS_H
+
+/* Define to 1 if you have the <string.h> header file. */
+#undef HAVE_STRING_H
+
+/* Define to 1 if you have the <sys/stat.h> header file. */
+#undef HAVE_SYS_STAT_H
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#undef HAVE_SYS_TYPES_H
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#undef HAVE_UNISTD_H
+
+/* Define to the sub-directory in which libtool stores uninstalled libraries.
+   */
+#undef LT_OBJDIR
+
+/* Name of package */
+#undef PACKAGE
+
+/* Define to the address where bug reports for this package should be sent. */
+#undef PACKAGE_BUGREPORT
+
+/* Define to the full name of this package. */
+#undef PACKAGE_NAME
+
+/* Define to the full name and version of this package. */
+#undef PACKAGE_STRING
+
+/* Define to the one symbol short name of this package. */
+#undef PACKAGE_TARNAME
+
+/* Define to the version of this package. */
+#undef PACKAGE_VERSION
+
+/* The size of `char', as computed by sizeof. */
+#undef SIZEOF_CHAR
+
+/* The size of `int', as computed by sizeof. */
+#undef SIZEOF_INT
+
+/* The size of `long', as computed by sizeof. */
+#undef SIZEOF_LONG
+
+/* The size of `short', as computed by sizeof. */
+#undef SIZEOF_SHORT
+
+/* If using the C implementation of alloca, define if you know the
+   direction of stack growth for your system; otherwise it will be
+   automatically deduced at runtime.
+	STACK_DIRECTION > 0 => grows toward higher addresses
+	STACK_DIRECTION < 0 => grows toward lower addresses
+	STACK_DIRECTION = 0 => direction of growth unknown */
+#undef STACK_DIRECTION
+
+/* Define to 1 if you have the ANSI C header files. */
+#undef STDC_HEADERS
+
+/* Version number of package */
+#undef VERSION
+
+/* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
+   significant byte first (like Motorola and SPARC, unlike Intel). */
+#if defined AC_APPLE_UNIVERSAL_BUILD
+# if defined __BIG_ENDIAN__
+#  define WORDS_BIGENDIAN 1
+# endif
+#else
+# ifndef WORDS_BIGENDIAN
+#  undef WORDS_BIGENDIAN
+# endif
+#endif

configure.in

@@ -0,0 +1,114 @@
+m4_define([libart_major_version], [2])
+m4_define([libart_minor_version], [3])
+m4_define([libart_micro_version], [21])
+m4_define([libart_version],
+          [libart_major_version.libart_minor_version.libart_micro_version])
+
+AC_INIT([libart-lgpl],[libart_version],[http://bugzilla.gnome.org/enter_bug.cgi?product=libart],[libart_lgpl])
+
+AC_CONFIG_HEADERS([config.h])
+
+LIBART_MAJOR_VERSION=libart_major_version
+LIBART_MINOR_VERSION=libart_minor_version
+LIBART_MICRO_VERSION=libart_micro_version
+LIBART_VERSION=libart_version
+
+LIBART_VERSION_INFO=`expr $LIBART_MAJOR_VERSION + $LIBART_MINOR_VERSION`:$LIBART_MICRO_VERSION:$LIBART_MINOR_VERSION
+
+AC_SUBST(LIBART_MAJOR_VERSION)
+AC_SUBST(LIBART_MINOR_VERSION)
+AC_SUBST(LIBART_MICRO_VERSION)
+AC_SUBST(LIBART_VERSION)
+AC_SUBST(LIBART_VERSION_INFO)
+
+AM_INIT_AUTOMAKE([1.9 foreign no-dist-gzip dist-bzip2])
+
+AC_ARG_ENABLE(ansi, [  --enable-ansi           turn on strict ansi [default=no]],
+		    , enable_ansi=no)
+
+AC_PROG_CC
+AC_PROG_CPP
+AC_LIBTOOL_WIN32_DLL
+AM_PROG_LIBTOOL
+
+AM_MAINTAINER_MODE
+
+AC_MSG_CHECKING([for some Win32 platform])
+case "$host" in
+  *-*-mingw*|*-*-cygwin*)
+    platform_win32=yes
+    ;;
+  *)
+    platform_win32=no
+    ;;
+esac
+AC_MSG_RESULT([$platform_win32])
+AM_CONDITIONAL(PLATFORM_WIN32, test "$platform_win32" = "yes")
+
+AC_MSG_CHECKING([for native Win32])
+case "$host" in
+  *-*-mingw*)
+    os_win32=yes
+    ;;
+  *)
+    os_win32=no
+    ;;
+esac
+AC_MSG_RESULT([$os_win32])
+AM_CONDITIONAL(OS_WIN32, test "$os_win32" = "yes")
+
+if test "$os_win32" = "yes"; then
+  AC_CHECK_PROG(ms_librarian, lib.exe, yes, no)
+fi
+AM_CONDITIONAL(MS_LIB_AVAILABLE, test x$ms_librarian = xyes)
+
+changequote(,)dnl
+if test "x$GCC" = "xyes"; then
+  case " $CFLAGS " in
+  *[\ \	]-Wall[\ \	]*) ;;
+  *) CFLAGS="$CFLAGS -Wall" ;;
+  esac
+
+  case " $CFLAGS " in
+  *[\ \	]-Wmissing-prototypes[\ \	]*) ;;
+  *) CFLAGS="$CFLAGS -Wmissing-prototypes" ;;
+  esac
+
+  if test "x$enable_ansi" = "xyes"; then
+    case " $CFLAGS " in
+    *[\ \	]-ansi[\ \	]*) ;;
+    *) CFLAGS="$CFLAGS -ansi" ;;
+    esac
+
+    case " $CFLAGS " in
+    *[\ \	]-pedantic[\ \	]*) ;;
+    *) CFLAGS="$CFLAGS -pedantic" ;;
+    esac
+  fi
+fi
+changequote([,])dnl
+
+AC_FUNC_ALLOCA
+
+AC_C_BIGENDIAN
+
+AC_CHECK_SIZEOF(char)
+AC_SUBST(ART_SIZEOF_CHAR, $ac_cv_sizeof_char)
+AC_CHECK_SIZEOF(short)
+AC_SUBST(ART_SIZEOF_SHORT, $ac_cv_sizeof_short)
+AC_CHECK_SIZEOF(int)
+AC_SUBST(ART_SIZEOF_INT, $ac_cv_sizeof_int)
+AC_CHECK_SIZEOF(long)
+AC_SUBST(ART_SIZEOF_LONG, $ac_cv_sizeof_long)
+
+AC_CONFIG_FILES([
+libart-features.h
+Makefile
+libart-2.0.pc
+libart-2.0-uninstalled.pc
+libart-zip])
+
+AC_CONFIG_FILES([libart-config],[chmod +x libart-config])
+AC_CONFIG_FILES([gen_art_config.sh],[chmod +x gen_art_config.sh])
+
+AC_OUTPUT

debian/changelog

@@ -0,0 +1,246 @@
+libart-lgpl (2.3.21-1) unstable; urgency=low
+
+  [ Loic Minier ]
+  * Properly anchor package name regexp.
+
+  [ Sebastian Dröge ]
+  * New upstream bugfix release:
+    + debian/control.in:
+      - Update Standards-Version and build-depend on autotools-dev.
+    + debian/patches/70_relibtoolize.patch:
+      - Regenerated for the new version.
+
+ -- Sebastian Dröge <slomo@debian.org>  Sun, 25 Apr 2010 11:35:30 +0200
+
+libart-lgpl (2.3.20-2) unstable; urgency=low
+
+  * Let libart-2.0-dev depend on shlibs:Depends.
+  * Extract library package name from control instead of hardcoding it in
+    rules.
+  * New patch, 60_libart-config-static, adds --static flag to libart2-config
+    to avoid -lm in the output of --libs; please consider switching to
+    pkg-config instead; GNOME #531278; closes: #375812.
+  * Fix copyright to state LGPL 2 or later as checked with licensecheck;
+    thanks Thomas Viehmann; closes: #478766.
+
+ -- Loic Minier <lool@dooz.org>  Sat, 03 May 2008 22:21:18 +0200
+
+libart-lgpl (2.3.20-1) unstable; urgency=low
+
+  [ Kilian Krause ]
+  * Use binary:version and source:Version for binNMU-safe uploads as
+    added in dpkg-dev 1.13.19. Add to Build-Depends accordingly.
+
+  [ Sebastian Dröge ]
+  * New upstream bugfix release:
+    + debian/patches/90_fix-headers-for-cplusplus.patch:
+      - Dropped, merged upstream.
+    + debian/patches/70_relibtoolize.patch:
+      - Regenerated for the new version.
+  * debian/control.in:
+    + Update Standards-Version to 3.7.3, no additional changes needed.
+
+ -- Sebastian Dröge <slomo@debian.org>  Wed, 30 Jan 2008 13:38:26 +0100
+
+libart-lgpl (2.3.19-3) unstable; urgency=low
+
+  * Upload to unstable; drop check-dist include.
+  * Wrap build-deps and deps.
+  * Drop libc6-dev dep in libart-2.0-dev.
+  * Add ${misc:Depends}.
+
+ -- Loic Minier <lool@dooz.org>  Wed, 11 Apr 2007 16:23:30 +0200
+
+libart-lgpl (2.3.19-2) experimental; urgency=high
+
+  * Use clean-la.mk and require gnome-pkg-tools 0.7.
+  * New patch, 90_fix-headers-for-cplusplus.patch, fixes linking with C++
+    applications; GNOME #413197; SVN r278; closes: #417568.
+  * Rename patch 070_relibtoolize to 70_relibtoolize.
+
+ -- Loic Minier <lool@dooz.org>  Tue, 03 Apr 2007 15:23:09 +0200
+
+libart-lgpl (2.3.19-1) experimental; urgency=low
+
+  * Add a get-orig-source target to retrieve the upstream tarball.
+  * Add complete licensing information in copyright file.
+  * Update upstream URL in copyright file.
+  * Bump up Standards-Version to 3.7.2.
+  * Use debian/libart-2.0-dev.manpages instead of
+    DEB_INSTALL_MANPAGES_libart-2.0-dev.
+  * Use HTTP in watch file and track all branches.
+  * Include CDBS's utils.
+  * New upstream releases with API additions.
+    - Include the new check-dist Makefile to prevent accidental uploads to
+      unstable; bump build-dep on gnome-pkg-tools to >= 0.10.
+    - Set shlibs to >= 2.3.18.
+    - Update and rename relibtoolizing patch, 070_relibtoolize.
+  * Drop useless libart-2.0-dev.files.
+  * Drop build-dep on libc6-dev | libc-dev; doh.
+  * Bump up DebHelper compatibility level to 5.
+
+ -- Loic Minier <lool@dooz.org>  Wed, 28 Feb 2007 15:20:45 +0100
+
+libart-lgpl (2.3.17-1) unstable; urgency=low
+
+  * GNOME Team Upload.
+  * New upstream release.
+  * debian/patches/001_relibtoolize.patch:
+    - updated.
+  * debian/watch:
+    - added.
+
+ -- Sebastien Bacher <seb128@debian.org>  Tue, 25 Jan 2005 23:51:07 +0100
+
+libart-lgpl (2.3.16-6) unstable; urgency=low
+
+  * Relibtoolize (Closes: #260639)
+
+ -- Ondřej Surý <ondrej@debian.org>  Wed, 21 Jul 2004 17:27:15 +0200
+
+libart-lgpl (2.3.16-5) unstable; urgency=low
+
+  * Set shlibs version to current.
+
+ -- Ondřej Surý <ondrej@debian.org>  Mon, 19 Apr 2004 18:49:50 +0200
+
+libart-lgpl (2.3.16-4) unstable; urgency=low
+
+  * Gnome Team upload.
+  * Setting again the shlibs file.
+
+ -- Sebastien Bacher <seb128@debian.org>  Thu, 15 Apr 2004 19:35:09 +0200
+
+libart-lgpl (2.3.16-3) unstable; urgency=low
+
+  * New maintainer (Closes: #238891)
+
+ -- Ondřej Surý <ondrej@debian.org>  Sat, 20 Mar 2004 15:14:54 +0100
+
+libart-lgpl (2.3.16-2) unstable; urgency=low
+
+  * Orphaned package.
+
+ -- Christian Marillat <marillat@debian.org>  Fri, 19 Mar 2004 16:06:24 +0100
+
+libart-lgpl (2.3.16-1) unstable; urgency=low
+
+  * New upstream release.
+  * Fix an "assertion failed" who crash gdm (Closes: #208919)
+
+ -- Christian Marillat <marillat@debian.org>  Wed, 10 Sep 2003 09:48:22 +0200
+
+libart-lgpl (2.3.15-1) unstable; urgency=low
+
+  * New upstream release.
+
+ -- Christian Marillat <marillat@debian.org>  Tue,  2 Sep 2003 14:14:16 +0200
+
+libart-lgpl (2.3.14-2) unstable; urgency=low
+
+  * Compiled with -mieee for alpha (Closes: #207748)
+
+ -- Christian Marillat <marillat@debian.org>  Fri, 29 Aug 2003 19:24:46 +0200
+
+libart-lgpl (2.3.14-1) unstable; urgency=low
+
+  * New upstream release.
+
+ -- Christian Marillat <marillat@debian.org>  Fri,  8 Aug 2003 10:23:11 +0200
+
+libart-lgpl (2.3.13-1) unstable; urgency=low
+
+  * new upstream release.
+
+ -- Christian Marillat <marillat@debian.org>  Fri, 11 Jul 2003 14:59:55 +0200
+
+libart-lgpl (2.3.12-1) unstable; urgency=low
+
+  * New upstream release.
+
+ -- Christian Marillat <marillat@debian.org>  Mon,  5 May 2003 12:58:07 +0200
+
+libart-lgpl (2.3.11-4) unstable; urgency=low
+
+  * Update section
+
+ -- Christian Marillat <marillat@debian.org>  Tue,  1 Apr 2003 18:52:25 +0200
+
+libart-lgpl (2.3.11-3) unstable; urgency=low
+
+  * Add a patche to fix configure for mipsel
+
+ -- Christian Marillat <marillat@debian.org>  Sat, 18 Jan 2003 10:11:41 +0100
+
+libart-lgpl (2.3.11-2) unstable; urgency=low
+
+  * Update description (Closes: #177003)
+
+ -- Christian Marillat <marillat@debian.org>  Fri, 17 Jan 2003 21:27:15 +0100
+
+libart-lgpl (2.3.11-1) unstable; urgency=low
+
+  * New upstream release.
+  * Bump Standards-Version to 3.5.8
+
+ -- Christian Marillat <marillat@debian.org>  Tue,  7 Jan 2003 19:40:48 +0100
+
+libart-lgpl (2.3.10-4) unstable; urgency=low
+
+  * Update to standards version 3.5.7
+
+ -- Christian Marillat <marillat@debian.org>  Sat, 21 Sep 2002 14:41:00 +0200
+
+libart-lgpl (2.3.10-3) unstable; urgency=low
+
+  * Replace libc6-dev by libc-dev for -dev package.
+
+ -- Christian Marillat <marillat@debian.org>  Thu,  5 Sep 2002 18:25:28 +0200
+
+libart-lgpl (2.3.10-2) unstable; urgency=low
+
+  * Move libc6-dev dependency in the -dev package.
+
+ -- Christian Marillat <marillat@debian.org>  Thu,  8 Aug 2002 14:34:51 +0200
+
+libart-lgpl (2.3.10-1) unstable; urgency=low
+
+  * New upstream release (Closes: #151622)
+
+ -- Christian Marillat <marillat@debian.org>  Tue,  2 Jul 2002 01:38:03 +0200
+
+libart-lgpl (2.3.9-2) unstable; urgency=low
+
+  * debian/control add a versioned dependency for the -dev package
+    (Closes: #151369)
+
+ -- Christian Marillat <marillat@debian.org>  Sat, 29 Jun 2002 17:39:39 +0200
+
+libart-lgpl (2.3.9-1) unstable; urgency=low
+
+  * New upstream release.
+
+ -- Christian Marillat <marillat@debian.org>  Tue, 25 Jun 2002 10:26:05 +0200
+
+libart-lgpl (2.3.8-2) unstable; urgency=low
+
+  * Add support for DEB_HOST_GNU_TYPE DEB_BUILD_GNU_TYPE and
+    DEB_BUILD_OPTIONS
+
+ -- Christian Marillat <marillat@debian.org>  Wed, 15 May 2002 22:28:40 +0200
+
+libart-lgpl (2.3.8-1) unstable; urgency=low
+
+  * New upstream release.
+
+ -- Christian Marillat <marillat@debian.org>  Mon, 14 Jan 2002 10:58:19 +0100
+
+libart-lgpl (2.3.7-1) unstable; urgency=low
+
+  * Initial Release.
+
+ -- Christian Marillat <marillat@debian.org>  Mon, 19 Nov 2001 18:29:06 +0100
+
+Local variables:
+mode: debian-changelog
+End:

debian/compat

@@ -0,0 +1 @@
+5

debian/control

@@ -0,0 +1,42 @@
+# This file is autogenerated. DO NOT EDIT!
+# 
+# Modifications should be made to debian/control.in instead.
+# This file is regenerated automatically in the clean target.
+
+Source: libart-lgpl
+Section: devel
+Priority: optional
+Maintainer: Josselin Mouette <joss@debian.org>
+Uploaders: Debian GNOME Maintainers <pkg-gnome-maintainers@lists.alioth.debian.org>, Loic Minier <lool@dooz.org>, Sebastian Dröge <slomo@debian.org>, Sebastien Bacher <seb128@debian.org>
+Standards-Version: 3.8.4
+Build-Depends: debhelper (>= 5),
+               gnome-pkg-tools (>= 0.7),
+               cdbs,
+               dpkg-dev (>= 1.13.19),
+               autotools-dev
+
+Package: libart-2.0-2
+Architecture: any
+Section: libs
+Depends: ${misc:Depends},
+         ${shlibs:Depends}
+Description: Library of functions for 2D graphics - runtime files
+ A library of functions for 2D graphics supporting a superset of the
+ PostScript imaging model, designed to be integrated with graphics, artwork,
+ and illustration programs. It is written in optimized C, and is fully
+ compatible with C++. With a small footprint of 10,000 lines of code, it is
+ especially suitable for embedded applications.
+
+Package: libart-2.0-dev
+Architecture: any
+Section: libdevel
+Depends: ${misc:Depends},
+         ${shlibs:Depends},
+         libart-2.0-2 (= ${binary:Version}),
+         pkg-config
+Description: Library of functions for 2D graphics - development files
+ A library of functions for 2D graphics supporting a superset of the
+ PostScript imaging model, designed to be integrated with graphics, artwork,
+ and illustration programs. It is written in optimized C, and is fully
+ compatible with C++. With a small footprint of 10,000 lines of code, it is
+ especially suitable for embedded applications.

debian/control.in

@@ -0,0 +1,37 @@
+Source: libart-lgpl
+Section: devel
+Priority: optional
+Maintainer: Josselin Mouette <joss@debian.org>
+Uploaders: @GNOME_TEAM@
+Standards-Version: 3.8.4
+Build-Depends: debhelper (>= 5),
+               gnome-pkg-tools (>= 0.7),
+               cdbs,
+               dpkg-dev (>= 1.13.19),
+               autotools-dev
+
+Package: libart-2.0-2
+Architecture: any
+Section: libs
+Depends: ${misc:Depends},
+         ${shlibs:Depends}
+Description: Library of functions for 2D graphics - runtime files
+ A library of functions for 2D graphics supporting a superset of the
+ PostScript imaging model, designed to be integrated with graphics, artwork,
+ and illustration programs. It is written in optimized C, and is fully
+ compatible with C++. With a small footprint of 10,000 lines of code, it is
+ especially suitable for embedded applications.
+
+Package: libart-2.0-dev
+Architecture: any
+Section: libdevel
+Depends: ${misc:Depends},
+         ${shlibs:Depends},
+         libart-2.0-2 (= ${binary:Version}),
+         pkg-config
+Description: Library of functions for 2D graphics - development files
+ A library of functions for 2D graphics supporting a superset of the
+ PostScript imaging model, designed to be integrated with graphics, artwork,
+ and illustration programs. It is written in optimized C, and is fully
+ compatible with C++. With a small footprint of 10,000 lines of code, it is
+ especially suitable for embedded applications.

debian/copyright

@@ -0,0 +1,27 @@
+This package was debianized by  Christian Marillat <marillat@debian.org> on
+Mon, 19 Nov 2001 18:29:06 +0100
+
+It was downloaded from http://ftp.gnome.org/pub/GNOME/sources/libart_lgpl/
+
+Upstream Author: Raph Levien <raph@acm.org>
+
+Copyright: 1998, 1999, 2000, 2001 Raph Levien <raph@acm.org>
+
+License:
+
+    This package is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This package is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this package; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+
+On Debian systems, the complete text of the GNU Lesser General
+Public License can be found in `/usr/share/common-licenses/LGPL'.

debian/libart-2.0-2.install

@@ -0,0 +1 @@
+debian/tmp/usr/lib/libart_lgpl_2.so.*

debian/libart-2.0-dev.install

@@ -0,0 +1,6 @@
+debian/tmp/usr/include
+debian/tmp/usr/lib/pkgconfig
+debian/tmp/usr/bin/libart2-config
+debian/tmp/usr/lib/libart_lgpl_2.a
+debian/tmp/usr/lib/libart_lgpl_2.la
+debian/tmp/usr/lib/libart_lgpl_2.so

debian/libart-2.0-dev.manpages

@@ -0,0 +1 @@
+debian/libart2-config.1

debian/libart2-config.1

@@ -0,0 +1,52 @@
+.\" This manpage has been automatically generated by docbook2man 
+.\" from a DocBook document.  This tool can be found at:
+.\" <http://shell.ipoline.com/~elmert/comp/docbook2X/> 
+.\" Please send any bug reports, improvements, comments, patches, 
+.\" etc. to Steve Cheng <steve@ggi-project.org>.
+.TH "LIBART2-CONFIG" "1" "08 August 2003" "" ""
+.SH NAME
+libart2-config \- script to get information about the installed version of libart 2.x
+.SH SYNOPSIS
+
+\fBlibart2-config\fR [ \fB --prefix\fI[=DIR]\fB \fR ] [ \fB --exec-prefix\fI[=DIR]\fB \fR ] [ \fB --libs \fR ] [ \fB --cflags \fR ] [ \fB --version \fR ]
+
+.SH "DESCRIPTION"
+.PP
+\fBlibart2-config\fR is a tool that is used to determine
+the compiler and linker flags that should be used to compile and
+link programs that use \fIlibart\fR library.
+.SH "OPTIONS"
+.TP
+\fB--prefix=PREFIX\fR
+If specified, use \fIPREFIX\fR instead
+of the installation prefix that
+\fIlibart\fR was built with when computing
+the output for the \fB--cflags\fR and
+\fB--libs\fR options. This option is also used for
+the exec prefix if \fB--exec-prefix\fR was
+not specified. This option must be specified before any
+\fB--libs\fR or \fB--cflags\fR options.
+.TP
+\fB--exec-prefix=PREFIX\fR
+If specified, use \fIPREFIX\fR instead
+of the installation exec prefix that
+\fIlibart\fR was built with when computing
+the output for the \fB--cflags\fR and
+\fB--libs\fR options. This option must be specified
+before any \fB--libs\fR or \fB--cflags\fR options.
+.TP
+\fB--libs\fR
+Print the linker flags that are necessary to link a
+\fIlibart\fR program.
+.TP
+\fB--cflags\fR
+Print the compiler flags that are necessary to compile a
+\fIlibart\fR program.
+.TP
+\fB--version\fR
+Print the currently installed version of
+\fIlibart\fR on the standard output.
+.SH "AUTHOR"
+.PP
+This manual page was written by Christian Marillat <marillat@debian.org> for
+the Debian GNU/Linux system (but may be used by others).

debian/patches/60_libart-config-static.patch

@@ -0,0 +1,38 @@
+Add --static support to libart2-config --libs to avoid -lm
+Debian #375812, GNOME #531278
+
+Index: libart-config.in
+===================================================================
+--- libart-config.in (revision 280)
++++ libart-config.in (working copy)
+@@ -3,6 +3,8 @@
+ prefix=@prefix@
+ exec_prefix=@exec_prefix@
+ exec_prefix_set=no
++libs=""
++output_libs=no
+ 
+ usage="\
+ Usage: libart-config [--prefix[=DIR]] [--exec-prefix[=DIR]] [--version] [--libs] [--cflags]"
+@@ -43,8 +45,11 @@ while test $# -gt 0; do
+       echo $includes
+       ;;
+     --libs)
+-      libdirs=-L@libdir@
+-      echo $libdirs -lart_lgpl_2 -lm
++      libs="$libs -L@libdir@ -lart_lgpl_2"
++      output_libs=yes
++      ;;
++    --static)
++      libs="$libs -lm"
+       ;;
+     *)
+       echo "${usage}" 1>&2
+@@ -54,3 +59,7 @@ while test $# -gt 0; do
+   shift
+ done
+ 
++if test $output_libs = yes ; then
++    echo $libs
++fi
++

debian/rules

@@ -0,0 +1,16 @@
+#!/usr/bin/make -f
+
+include /usr/share/cdbs/1/rules/debhelper.mk
+include /usr/share/cdbs/1/rules/simple-patchsys.mk
+include /usr/share/cdbs/1/rules/utils.mk
+include /usr/share/cdbs/1/class/gnome.mk
+include /usr/share/gnome-pkg-tools/1/rules/uploaders.mk
+include /usr/share/gnome-pkg-tools/1/rules/clean-la.mk
+-include /usr/share/gnome-pkg-tools/1/rules/gnome-get-source.mk
+
+libart-2.0-N := $(shell sed -rn 's/^Package:[[:space:]]*(libart-2\.0-[0-9]+)[[:space:]]*$$/\1/p' debian/control)
+
+GNOME_MODULE := libart_lgpl
+
+DEB_DH_MAKESHLIBS_ARGS_$(libart-2.0-N) += -V '$(libart-2.0-N)(>= 2.3.18)'
+

debian/watch

@@ -0,0 +1,4 @@
+version=2
+http://ftp.gnome.org/pub/GNOME/sources/libart_lgpl/([\d\.]+)/ \
+        libart_lgpl-(.*)\.tar\.gz \
+        debian uupdate

depcomp

@@ -0,0 +1,630 @@
+#! /bin/sh
+# depcomp - compile a program generating dependencies as side-effects
+
+scriptversion=2009-04-28.21; # UTC
+
+# Copyright (C) 1999, 2000, 2003, 2004, 2005, 2006, 2007, 2009 Free
+# Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# As a special exception to the GNU General Public License, if you
+# distribute this file as part of a program that contains a
+# configuration script generated by Autoconf, you may include it under
+# the same distribution terms that you use for the rest of that program.
+
+# Originally written by Alexandre Oliva <oliva@dcc.unicamp.br>.
+
+case $1 in
+  '')
+     echo "$0: No command.  Try \`$0 --help' for more information." 1>&2
+     exit 1;
+     ;;
+  -h | --h*)
+    cat <<\EOF
+Usage: depcomp [--help] [--version] PROGRAM [ARGS]
+
+Run PROGRAMS ARGS to compile a file, generating dependencies
+as side-effects.
+
+Environment variables:
+  depmode     Dependency tracking mode.
+  source      Source file read by `PROGRAMS ARGS'.
+  object      Object file output by `PROGRAMS ARGS'.
+  DEPDIR      directory where to store dependencies.
+  depfile     Dependency file to output.
+  tmpdepfile  Temporary file to use when outputing dependencies.
+  libtool     Whether libtool is used (yes/no).
+
+Report bugs to <bug-automake@gnu.org>.
+EOF
+    exit $?
+    ;;
+  -v | --v*)
+    echo "depcomp $scriptversion"
+    exit $?
+    ;;
+esac
+
+if test -z "$depmode" || test -z "$source" || test -z "$object"; then
+  echo "depcomp: Variables source, object and depmode must be set" 1>&2
+  exit 1
+fi
+
+# Dependencies for sub/bar.o or sub/bar.obj go into sub/.deps/bar.Po.
+depfile=${depfile-`echo "$object" |
+  sed 's|[^\\/]*$|'${DEPDIR-.deps}'/&|;s|\.\([^.]*\)$|.P\1|;s|Pobj$|Po|'`}
+tmpdepfile=${tmpdepfile-`echo "$depfile" | sed 's/\.\([^.]*\)$/.T\1/'`}
+
+rm -f "$tmpdepfile"
+
+# Some modes work just like other modes, but use different flags.  We
+# parameterize here, but still list the modes in the big case below,
+# to make depend.m4 easier to write.  Note that we *cannot* use a case
+# here, because this file can only contain one case statement.
+if test "$depmode" = hp; then
+  # HP compiler uses -M and no extra arg.
+  gccflag=-M
+  depmode=gcc
+fi
+
+if test "$depmode" = dashXmstdout; then
+   # This is just like dashmstdout with a different argument.
+   dashmflag=-xM
+   depmode=dashmstdout
+fi
+
+cygpath_u="cygpath -u -f -"
+if test "$depmode" = msvcmsys; then
+   # This is just like msvisualcpp but w/o cygpath translation.
+   # Just convert the backslash-escaped backslashes to single forward
+   # slashes to satisfy depend.m4
+   cygpath_u="sed s,\\\\\\\\,/,g"
+   depmode=msvisualcpp
+fi
+
+case "$depmode" in
+gcc3)
+## gcc 3 implements dependency tracking that does exactly what
+## we want.  Yay!  Note: for some reason libtool 1.4 doesn't like
+## it if -MD -MP comes after the -MF stuff.  Hmm.
+## Unfortunately, FreeBSD c89 acceptance of flags depends upon
+## the command line argument order; so add the flags where they
+## appear in depend2.am.  Note that the slowdown incurred here
+## affects only configure: in makefiles, %FASTDEP% shortcuts this.
+  for arg
+  do
+    case $arg in
+    -c) set fnord "$@" -MT "$object" -MD -MP -MF "$tmpdepfile" "$arg" ;;
+    *)  set fnord "$@" "$arg" ;;
+    esac
+    shift # fnord
+    shift # $arg
+  done
+  "$@"
+  stat=$?
+  if test $stat -eq 0; then :
+  else
+    rm -f "$tmpdepfile"
+    exit $stat
+  fi
+  mv "$tmpdepfile" "$depfile"
+  ;;
+
+gcc)
+## There are various ways to get dependency output from gcc.  Here's
+## why we pick this rather obscure method:
+## - Don't want to use -MD because we'd like the dependencies to end
+##   up in a subdir.  Having to rename by hand is ugly.
+##   (We might end up doing this anyway to support other compilers.)
+## - The DEPENDENCIES_OUTPUT environment variable makes gcc act like
+##   -MM, not -M (despite what the docs say).
+## - Using -M directly means running the compiler twice (even worse
+##   than renaming).
+  if test -z "$gccflag"; then
+    gccflag=-MD,
+  fi
+  "$@" -Wp,"$gccflag$tmpdepfile"
+  stat=$?
+  if test $stat -eq 0; then :
+  else
+    rm -f "$tmpdepfile"
+    exit $stat
+  fi
+  rm -f "$depfile"
+  echo "$object : \\" > "$depfile"
+  alpha=ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
+## The second -e expression handles DOS-style file names with drive letters.
+  sed -e 's/^[^:]*: / /' \
+      -e 's/^['$alpha']:\/[^:]*: / /' < "$tmpdepfile" >> "$depfile"
+## This next piece of magic avoids the `deleted header file' problem.
+## The problem is that when a header file which appears in a .P file
+## is deleted, the dependency causes make to die (because there is
+## typically no way to rebuild the header).  We avoid this by adding
+## dummy dependencies for each header file.  Too bad gcc doesn't do
+## this for us directly.
+  tr ' ' '
+' < "$tmpdepfile" |
+## Some versions of gcc put a space before the `:'.  On the theory
+## that the space means something, we add a space to the output as
+## well.
+## Some versions of the HPUX 10.20 sed can't process this invocation
+## correctly.  Breaking it into two sed invocations is a workaround.
+    sed -e 's/^\\$//' -e '/^$/d' -e '/:$/d' | sed -e 's/$/ :/' >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+hp)
+  # This case exists only to let depend.m4 do its work.  It works by
+  # looking at the text of this script.  This case will never be run,
+  # since it is checked for above.
+  exit 1
+  ;;
+
+sgi)
+  if test "$libtool" = yes; then
+    "$@" "-Wp,-MDupdate,$tmpdepfile"
+  else
+    "$@" -MDupdate "$tmpdepfile"
+  fi
+  stat=$?
+  if test $stat -eq 0; then :
+  else
+    rm -f "$tmpdepfile"
+    exit $stat
+  fi
+  rm -f "$depfile"
+
+  if test -f "$tmpdepfile"; then  # yes, the sourcefile depend on other files
+    echo "$object : \\" > "$depfile"
+
+    # Clip off the initial element (the dependent).  Don't try to be
+    # clever and replace this with sed code, as IRIX sed won't handle
+    # lines with more than a fixed number of characters (4096 in
+    # IRIX 6.2 sed, 8192 in IRIX 6.5).  We also remove comment lines;
+    # the IRIX cc adds comments like `#:fec' to the end of the
+    # dependency line.
+    tr ' ' '
+' < "$tmpdepfile" \
+    | sed -e 's/^.*\.o://' -e 's/#.*$//' -e '/^$/ d' | \
+    tr '
+' ' ' >> "$depfile"
+    echo >> "$depfile"
+
+    # The second pass generates a dummy entry for each header file.
+    tr ' ' '
+' < "$tmpdepfile" \
+   | sed -e 's/^.*\.o://' -e 's/#.*$//' -e '/^$/ d' -e 's/$/:/' \
+   >> "$depfile"
+  else
+    # The sourcefile does not contain any dependencies, so just
+    # store a dummy comment line, to avoid errors with the Makefile
+    # "include basename.Plo" scheme.
+    echo "#dummy" > "$depfile"
+  fi
+  rm -f "$tmpdepfile"
+  ;;
+
+aix)
+  # The C for AIX Compiler uses -M and outputs the dependencies
+  # in a .u file.  In older versions, this file always lives in the
+  # current directory.  Also, the AIX compiler puts `$object:' at the
+  # start of each line; $object doesn't have directory information.
+  # Version 6 uses the directory in both cases.
+  dir=`echo "$object" | sed -e 's|/[^/]*$|/|'`
+  test "x$dir" = "x$object" && dir=
+  base=`echo "$object" | sed -e 's|^.*/||' -e 's/\.o$//' -e 's/\.lo$//'`
+  if test "$libtool" = yes; then
+    tmpdepfile1=$dir$base.u
+    tmpdepfile2=$base.u
+    tmpdepfile3=$dir.libs/$base.u
+    "$@" -Wc,-M
+  else
+    tmpdepfile1=$dir$base.u
+    tmpdepfile2=$dir$base.u
+    tmpdepfile3=$dir$base.u
+    "$@" -M
+  fi
+  stat=$?
+
+  if test $stat -eq 0; then :
+  else
+    rm -f "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3"
+    exit $stat
+  fi
+
+  for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3"
+  do
+    test -f "$tmpdepfile" && break
+  done
+  if test -f "$tmpdepfile"; then
+    # Each line is of the form `foo.o: dependent.h'.
+    # Do two passes, one to just change these to
+    # `$object: dependent.h' and one to simply `dependent.h:'.
+    sed -e "s,^.*\.[a-z]*:,$object:," < "$tmpdepfile" > "$depfile"
+    # That's a tab and a space in the [].
+    sed -e 's,^.*\.[a-z]*:[	 ]*,,' -e 's,$,:,' < "$tmpdepfile" >> "$depfile"
+  else
+    # The sourcefile does not contain any dependencies, so just
+    # store a dummy comment line, to avoid errors with the Makefile
+    # "include basename.Plo" scheme.
+    echo "#dummy" > "$depfile"
+  fi
+  rm -f "$tmpdepfile"
+  ;;
+
+icc)
+  # Intel's C compiler understands `-MD -MF file'.  However on
+  #    icc -MD -MF foo.d -c -o sub/foo.o sub/foo.c
+  # ICC 7.0 will fill foo.d with something like
+  #    foo.o: sub/foo.c
+  #    foo.o: sub/foo.h
+  # which is wrong.  We want:
+  #    sub/foo.o: sub/foo.c
+  #    sub/foo.o: sub/foo.h
+  #    sub/foo.c:
+  #    sub/foo.h:
+  # ICC 7.1 will output
+  #    foo.o: sub/foo.c sub/foo.h
+  # and will wrap long lines using \ :
+  #    foo.o: sub/foo.c ... \
+  #     sub/foo.h ... \
+  #     ...
+
+  "$@" -MD -MF "$tmpdepfile"
+  stat=$?
+  if test $stat -eq 0; then :
+  else
+    rm -f "$tmpdepfile"
+    exit $stat
+  fi
+  rm -f "$depfile"
+  # Each line is of the form `foo.o: dependent.h',
+  # or `foo.o: dep1.h dep2.h \', or ` dep3.h dep4.h \'.
+  # Do two passes, one to just change these to
+  # `$object: dependent.h' and one to simply `dependent.h:'.
+  sed "s,^[^:]*:,$object :," < "$tmpdepfile" > "$depfile"
+  # Some versions of the HPUX 10.20 sed can't process this invocation
+  # correctly.  Breaking it into two sed invocations is a workaround.
+  sed 's,^[^:]*: \(.*\)$,\1,;s/^\\$//;/^$/d;/:$/d' < "$tmpdepfile" |
+    sed -e 's/$/ :/' >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+hp2)
+  # The "hp" stanza above does not work with aCC (C++) and HP's ia64
+  # compilers, which have integrated preprocessors.  The correct option
+  # to use with these is +Maked; it writes dependencies to a file named
+  # 'foo.d', which lands next to the object file, wherever that
+  # happens to be.
+  # Much of this is similar to the tru64 case; see comments there.
+  dir=`echo "$object" | sed -e 's|/[^/]*$|/|'`
+  test "x$dir" = "x$object" && dir=
+  base=`echo "$object" | sed -e 's|^.*/||' -e 's/\.o$//' -e 's/\.lo$//'`
+  if test "$libtool" = yes; then
+    tmpdepfile1=$dir$base.d
+    tmpdepfile2=$dir.libs/$base.d
+    "$@" -Wc,+Maked
+  else
+    tmpdepfile1=$dir$base.d
+    tmpdepfile2=$dir$base.d
+    "$@" +Maked
+  fi
+  stat=$?
+  if test $stat -eq 0; then :
+  else
+     rm -f "$tmpdepfile1" "$tmpdepfile2"
+     exit $stat
+  fi
+
+  for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2"
+  do
+    test -f "$tmpdepfile" && break
+  done
+  if test -f "$tmpdepfile"; then
+    sed -e "s,^.*\.[a-z]*:,$object:," "$tmpdepfile" > "$depfile"
+    # Add `dependent.h:' lines.
+    sed -ne '2,${
+	       s/^ *//
+	       s/ \\*$//
+	       s/$/:/
+	       p
+	     }' "$tmpdepfile" >> "$depfile"
+  else
+    echo "#dummy" > "$depfile"
+  fi
+  rm -f "$tmpdepfile" "$tmpdepfile2"
+  ;;
+
+tru64)
+   # The Tru64 compiler uses -MD to generate dependencies as a side
+   # effect.  `cc -MD -o foo.o ...' puts the dependencies into `foo.o.d'.
+   # At least on Alpha/Redhat 6.1, Compaq CCC V6.2-504 seems to put
+   # dependencies in `foo.d' instead, so we check for that too.
+   # Subdirectories are respected.
+   dir=`echo "$object" | sed -e 's|/[^/]*$|/|'`
+   test "x$dir" = "x$object" && dir=
+   base=`echo "$object" | sed -e 's|^.*/||' -e 's/\.o$//' -e 's/\.lo$//'`
+
+   if test "$libtool" = yes; then
+      # With Tru64 cc, shared objects can also be used to make a
+      # static library.  This mechanism is used in libtool 1.4 series to
+      # handle both shared and static libraries in a single compilation.
+      # With libtool 1.4, dependencies were output in $dir.libs/$base.lo.d.
+      #
+      # With libtool 1.5 this exception was removed, and libtool now
+      # generates 2 separate objects for the 2 libraries.  These two
+      # compilations output dependencies in $dir.libs/$base.o.d and
+      # in $dir$base.o.d.  We have to check for both files, because
+      # one of the two compilations can be disabled.  We should prefer
+      # $dir$base.o.d over $dir.libs/$base.o.d because the latter is
+      # automatically cleaned when .libs/ is deleted, while ignoring
+      # the former would cause a distcleancheck panic.
+      tmpdepfile1=$dir.libs/$base.lo.d   # libtool 1.4
+      tmpdepfile2=$dir$base.o.d          # libtool 1.5
+      tmpdepfile3=$dir.libs/$base.o.d    # libtool 1.5
+      tmpdepfile4=$dir.libs/$base.d      # Compaq CCC V6.2-504
+      "$@" -Wc,-MD
+   else
+      tmpdepfile1=$dir$base.o.d
+      tmpdepfile2=$dir$base.d
+      tmpdepfile3=$dir$base.d
+      tmpdepfile4=$dir$base.d
+      "$@" -MD
+   fi
+
+   stat=$?
+   if test $stat -eq 0; then :
+   else
+      rm -f "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3" "$tmpdepfile4"
+      exit $stat
+   fi
+
+   for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3" "$tmpdepfile4"
+   do
+     test -f "$tmpdepfile" && break
+   done
+   if test -f "$tmpdepfile"; then
+      sed -e "s,^.*\.[a-z]*:,$object:," < "$tmpdepfile" > "$depfile"
+      # That's a tab and a space in the [].
+      sed -e 's,^.*\.[a-z]*:[	 ]*,,' -e 's,$,:,' < "$tmpdepfile" >> "$depfile"
+   else
+      echo "#dummy" > "$depfile"
+   fi
+   rm -f "$tmpdepfile"
+   ;;
+
+#nosideeffect)
+  # This comment above is used by automake to tell side-effect
+  # dependency tracking mechanisms from slower ones.
+
+dashmstdout)
+  # Important note: in order to support this mode, a compiler *must*
+  # always write the preprocessed file to stdout, regardless of -o.
+  "$@" || exit $?
+
+  # Remove the call to Libtool.
+  if test "$libtool" = yes; then
+    while test "X$1" != 'X--mode=compile'; do
+      shift
+    done
+    shift
+  fi
+
+  # Remove `-o $object'.
+  IFS=" "
+  for arg
+  do
+    case $arg in
+    -o)
+      shift
+      ;;
+    $object)
+      shift
+      ;;
+    *)
+      set fnord "$@" "$arg"
+      shift # fnord
+      shift # $arg
+      ;;
+    esac
+  done
+
+  test -z "$dashmflag" && dashmflag=-M
+  # Require at least two characters before searching for `:'
+  # in the target name.  This is to cope with DOS-style filenames:
+  # a dependency such as `c:/foo/bar' could be seen as target `c' otherwise.
+  "$@" $dashmflag |
+    sed 's:^[  ]*[^: ][^:][^:]*\:[    ]*:'"$object"'\: :' > "$tmpdepfile"
+  rm -f "$depfile"
+  cat < "$tmpdepfile" > "$depfile"
+  tr ' ' '
+' < "$tmpdepfile" | \
+## Some versions of the HPUX 10.20 sed can't process this invocation
+## correctly.  Breaking it into two sed invocations is a workaround.
+    sed -e 's/^\\$//' -e '/^$/d' -e '/:$/d' | sed -e 's/$/ :/' >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+dashXmstdout)
+  # This case only exists to satisfy depend.m4.  It is never actually
+  # run, as this mode is specially recognized in the preamble.
+  exit 1
+  ;;
+
+makedepend)
+  "$@" || exit $?
+  # Remove any Libtool call
+  if test "$libtool" = yes; then
+    while test "X$1" != 'X--mode=compile'; do
+      shift
+    done
+    shift
+  fi
+  # X makedepend
+  shift
+  cleared=no eat=no
+  for arg
+  do
+    case $cleared in
+    no)
+      set ""; shift
+      cleared=yes ;;
+    esac
+    if test $eat = yes; then
+      eat=no
+      continue
+    fi
+    case "$arg" in
+    -D*|-I*)
+      set fnord "$@" "$arg"; shift ;;
+    # Strip any option that makedepend may not understand.  Remove
+    # the object too, otherwise makedepend will parse it as a source file.
+    -arch)
+      eat=yes ;;
+    -*|$object)
+      ;;
+    *)
+      set fnord "$@" "$arg"; shift ;;
+    esac
+  done
+  obj_suffix=`echo "$object" | sed 's/^.*\././'`
+  touch "$tmpdepfile"
+  ${MAKEDEPEND-makedepend} -o"$obj_suffix" -f"$tmpdepfile" "$@"
+  rm -f "$depfile"
+  cat < "$tmpdepfile" > "$depfile"
+  sed '1,2d' "$tmpdepfile" | tr ' ' '
+' | \
+## Some versions of the HPUX 10.20 sed can't process this invocation
+## correctly.  Breaking it into two sed invocations is a workaround.
+    sed -e 's/^\\$//' -e '/^$/d' -e '/:$/d' | sed -e 's/$/ :/' >> "$depfile"
+  rm -f "$tmpdepfile" "$tmpdepfile".bak
+  ;;
+
+cpp)
+  # Important note: in order to support this mode, a compiler *must*
+  # always write the preprocessed file to stdout.
+  "$@" || exit $?
+
+  # Remove the call to Libtool.
+  if test "$libtool" = yes; then
+    while test "X$1" != 'X--mode=compile'; do
+      shift
+    done
+    shift
+  fi
+
+  # Remove `-o $object'.
+  IFS=" "
+  for arg
+  do
+    case $arg in
+    -o)
+      shift
+      ;;
+    $object)
+      shift
+      ;;
+    *)
+      set fnord "$@" "$arg"
+      shift # fnord
+      shift # $arg
+      ;;
+    esac
+  done
+
+  "$@" -E |
+    sed -n -e '/^# [0-9][0-9]* "\([^"]*\)".*/ s:: \1 \\:p' \
+       -e '/^#line [0-9][0-9]* "\([^"]*\)".*/ s:: \1 \\:p' |
+    sed '$ s: \\$::' > "$tmpdepfile"
+  rm -f "$depfile"
+  echo "$object : \\" > "$depfile"
+  cat < "$tmpdepfile" >> "$depfile"
+  sed < "$tmpdepfile" '/^$/d;s/^ //;s/ \\$//;s/$/ :/' >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+msvisualcpp)
+  # Important note: in order to support this mode, a compiler *must*
+  # always write the preprocessed file to stdout.
+  "$@" || exit $?
+
+  # Remove the call to Libtool.
+  if test "$libtool" = yes; then
+    while test "X$1" != 'X--mode=compile'; do
+      shift
+    done
+    shift
+  fi
+
+  IFS=" "
+  for arg
+  do
+    case "$arg" in
+    -o)
+      shift
+      ;;
+    $object)
+      shift
+      ;;
+    "-Gm"|"/Gm"|"-Gi"|"/Gi"|"-ZI"|"/ZI")
+	set fnord "$@"
+	shift
+	shift
+	;;
+    *)
+	set fnord "$@" "$arg"
+	shift
+	shift
+	;;
+    esac
+  done
+  "$@" -E 2>/dev/null |
+  sed -n '/^#line [0-9][0-9]* "\([^"]*\)"/ s::\1:p' | $cygpath_u | sort -u > "$tmpdepfile"
+  rm -f "$depfile"
+  echo "$object : \\" > "$depfile"
+  sed < "$tmpdepfile" -n -e 's% %\\ %g' -e '/^\(.*\)$/ s::	\1 \\:p' >> "$depfile"
+  echo "	" >> "$depfile"
+  sed < "$tmpdepfile" -n -e 's% %\\ %g' -e '/^\(.*\)$/ s::\1\::p' >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+msvcmsys)
+  # This case exists only to let depend.m4 do its work.  It works by
+  # looking at the text of this script.  This case will never be run,
+  # since it is checked for above.
+  exit 1
+  ;;
+
+none)
+  exec "$@"
+  ;;
+
+*)
+  echo "Unknown depmode $depmode" 1>&2
+  exit 1
+  ;;
+esac
+
+exit 0
+
+# Local Variables:
+# mode: shell-script
+# sh-indentation: 2
+# eval: (add-hook 'write-file-hooks 'time-stamp)
+# time-stamp-start: "scriptversion="
+# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-time-zone: "UTC"
+# time-stamp-end: "; # UTC"
+# End:

gen_art_config.sh.in

@@ -0,0 +1,43 @@
+#!/bin/sh
+
+# A little utility function to generate header info.
+#
+# The output of this program is generally written to art_config.h,
+# which is installed in libart's include dir.
+
+
+echo "/* Automatically generated by gen_art_config */"
+echo
+echo "#define ART_SIZEOF_CHAR @ART_SIZEOF_CHAR@"
+echo "#define ART_SIZEOF_SHORT @ART_SIZEOF_SHORT@"
+echo "#define ART_SIZEOF_INT @ART_SIZEOF_INT@"
+echo "#define ART_SIZEOF_LONG @ART_SIZEOF_LONG@"
+echo
+
+if test @ART_SIZEOF_CHAR@ -eq 1; then
+  echo "typedef unsigned char art_u8;"
+else
+  echo 1>&2 "sizeof(char) != 1"
+  exit 1
+fi
+
+if test @ART_SIZEOF_SHORT@ -eq 2; then
+  echo "typedef unsigned short art_u16;"
+else
+  echo 1>&2 "sizeof(short) != 2"
+  exit 2
+fi
+
+if test @ART_SIZEOF_INT@ -eq 4; then
+  echo "typedef unsigned int art_u32;"
+else
+  if test @ART_SIZEOF_LONG@ -eq 4; then
+    echo "typedef unsigned long art_u32;"
+  else
+    echo 1>&2 "sizeof(int) != 4 and sizeof(long) != 4"
+	exit 3
+  fi
+fi
+
+exit 0
+}

install-sh

@@ -0,0 +1,520 @@
+#!/bin/sh
+# install - install a program, script, or datafile
+
+scriptversion=2009-04-28.21; # UTC
+
+# This originates from X11R5 (mit/util/scripts/install.sh), which was
+# later released in X11R6 (xc/config/util/install.sh) with the
+# following copyright and license.
+#
+# Copyright (C) 1994 X Consortium
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to
+# deal in the Software without restriction, including without limitation the
+# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+# sell copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+# X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+# AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNEC-
+# TION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+# Except as contained in this notice, the name of the X Consortium shall not
+# be used in advertising or otherwise to promote the sale, use or other deal-
+# ings in this Software without prior written authorization from the X Consor-
+# tium.
+#
+#
+# FSF changes to this file are in the public domain.
+#
+# Calling this script install-sh is preferred over install.sh, to prevent
+# `make' implicit rules from creating a file called install from it
+# when there is no Makefile.
+#
+# This script is compatible with the BSD install script, but was written
+# from scratch.
+
+nl='
+'
+IFS=" ""	$nl"
+
+# set DOITPROG to echo to test this script
+
+# Don't use :- since 4.3BSD and earlier shells don't like it.
+doit=${DOITPROG-}
+if test -z "$doit"; then
+  doit_exec=exec
+else
+  doit_exec=$doit
+fi
+
+# Put in absolute file names if you don't have them in your path;
+# or use environment vars.
+
+chgrpprog=${CHGRPPROG-chgrp}
+chmodprog=${CHMODPROG-chmod}
+chownprog=${CHOWNPROG-chown}
+cmpprog=${CMPPROG-cmp}
+cpprog=${CPPROG-cp}
+mkdirprog=${MKDIRPROG-mkdir}
+mvprog=${MVPROG-mv}
+rmprog=${RMPROG-rm}
+stripprog=${STRIPPROG-strip}
+
+posix_glob='?'
+initialize_posix_glob='
+  test "$posix_glob" != "?" || {
+    if (set -f) 2>/dev/null; then
+      posix_glob=
+    else
+      posix_glob=:
+    fi
+  }
+'
+
+posix_mkdir=
+
+# Desired mode of installed file.
+mode=0755
+
+chgrpcmd=
+chmodcmd=$chmodprog
+chowncmd=
+mvcmd=$mvprog
+rmcmd="$rmprog -f"
+stripcmd=
+
+src=
+dst=
+dir_arg=
+dst_arg=
+
+copy_on_change=false
+no_target_directory=
+
+usage="\
+Usage: $0 [OPTION]... [-T] SRCFILE DSTFILE
+   or: $0 [OPTION]... SRCFILES... DIRECTORY
+   or: $0 [OPTION]... -t DIRECTORY SRCFILES...
+   or: $0 [OPTION]... -d DIRECTORIES...
+
+In the 1st form, copy SRCFILE to DSTFILE.
+In the 2nd and 3rd, copy all SRCFILES to DIRECTORY.
+In the 4th, create DIRECTORIES.
+
+Options:
+     --help     display this help and exit.
+     --version  display version info and exit.
+
+  -c            (ignored)
+  -C            install only if different (preserve the last data modification time)
+  -d            create directories instead of installing files.
+  -g GROUP      $chgrpprog installed files to GROUP.
+  -m MODE       $chmodprog installed files to MODE.
+  -o USER       $chownprog installed files to USER.
+  -s            $stripprog installed files.
+  -t DIRECTORY  install into DIRECTORY.
+  -T            report an error if DSTFILE is a directory.
+
+Environment variables override the default commands:
+  CHGRPPROG CHMODPROG CHOWNPROG CMPPROG CPPROG MKDIRPROG MVPROG
+  RMPROG STRIPPROG
+"
+
+while test $# -ne 0; do
+  case $1 in
+    -c) ;;
+
+    -C) copy_on_change=true;;
+
+    -d) dir_arg=true;;
+
+    -g) chgrpcmd="$chgrpprog $2"
+	shift;;
+
+    --help) echo "$usage"; exit $?;;
+
+    -m) mode=$2
+	case $mode in
+	  *' '* | *'	'* | *'
+'*	  | *'*'* | *'?'* | *'['*)
+	    echo "$0: invalid mode: $mode" >&2
+	    exit 1;;
+	esac
+	shift;;
+
+    -o) chowncmd="$chownprog $2"
+	shift;;
+
+    -s) stripcmd=$stripprog;;
+
+    -t) dst_arg=$2
+	shift;;
+
+    -T) no_target_directory=true;;
+
+    --version) echo "$0 $scriptversion"; exit $?;;
+
+    --)	shift
+	break;;
+
+    -*)	echo "$0: invalid option: $1" >&2
+	exit 1;;
+
+    *)  break;;
+  esac
+  shift
+done
+
+if test $# -ne 0 && test -z "$dir_arg$dst_arg"; then
+  # When -d is used, all remaining arguments are directories to create.
+  # When -t is used, the destination is already specified.
+  # Otherwise, the last argument is the destination.  Remove it from $@.
+  for arg
+  do
+    if test -n "$dst_arg"; then
+      # $@ is not empty: it contains at least $arg.
+      set fnord "$@" "$dst_arg"
+      shift # fnord
+    fi
+    shift # arg
+    dst_arg=$arg
+  done
+fi
+
+if test $# -eq 0; then
+  if test -z "$dir_arg"; then
+    echo "$0: no input file specified." >&2
+    exit 1
+  fi
+  # It's OK to call `install-sh -d' without argument.
+  # This can happen when creating conditional directories.
+  exit 0
+fi
+
+if test -z "$dir_arg"; then
+  trap '(exit $?); exit' 1 2 13 15
+
+  # Set umask so as not to create temps with too-generous modes.
+  # However, 'strip' requires both read and write access to temps.
+  case $mode in
+    # Optimize common cases.
+    *644) cp_umask=133;;
+    *755) cp_umask=22;;
+
+    *[0-7])
+      if test -z "$stripcmd"; then
+	u_plus_rw=
+      else
+	u_plus_rw='% 200'
+      fi
+      cp_umask=`expr '(' 777 - $mode % 1000 ')' $u_plus_rw`;;
+    *)
+      if test -z "$stripcmd"; then
+	u_plus_rw=
+      else
+	u_plus_rw=,u+rw
+      fi
+      cp_umask=$mode$u_plus_rw;;
+  esac
+fi
+
+for src
+do
+  # Protect names starting with `-'.
+  case $src in
+    -*) src=./$src;;
+  esac
+
+  if test -n "$dir_arg"; then
+    dst=$src
+    dstdir=$dst
+    test -d "$dstdir"
+    dstdir_status=$?
+  else
+
+    # Waiting for this to be detected by the "$cpprog $src $dsttmp" command
+    # might cause directories to be created, which would be especially bad
+    # if $src (and thus $dsttmp) contains '*'.
+    if test ! -f "$src" && test ! -d "$src"; then
+      echo "$0: $src does not exist." >&2
+      exit 1
+    fi
+
+    if test -z "$dst_arg"; then
+      echo "$0: no destination specified." >&2
+      exit 1
+    fi
+
+    dst=$dst_arg
+    # Protect names starting with `-'.
+    case $dst in
+      -*) dst=./$dst;;
+    esac
+
+    # If destination is a directory, append the input filename; won't work
+    # if double slashes aren't ignored.
+    if test -d "$dst"; then
+      if test -n "$no_target_directory"; then
+	echo "$0: $dst_arg: Is a directory" >&2
+	exit 1
+      fi
+      dstdir=$dst
+      dst=$dstdir/`basename "$src"`
+      dstdir_status=0
+    else
+      # Prefer dirname, but fall back on a substitute if dirname fails.
+      dstdir=`
+	(dirname "$dst") 2>/dev/null ||
+	expr X"$dst" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
+	     X"$dst" : 'X\(//\)[^/]' \| \
+	     X"$dst" : 'X\(//\)$' \| \
+	     X"$dst" : 'X\(/\)' \| . 2>/dev/null ||
+	echo X"$dst" |
+	    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
+		   s//\1/
+		   q
+		 }
+		 /^X\(\/\/\)[^/].*/{
+		   s//\1/
+		   q
+		 }
+		 /^X\(\/\/\)$/{
+		   s//\1/
+		   q
+		 }
+		 /^X\(\/\).*/{
+		   s//\1/
+		   q
+		 }
+		 s/.*/./; q'
+      `
+
+      test -d "$dstdir"
+      dstdir_status=$?
+    fi
+  fi
+
+  obsolete_mkdir_used=false
+
+  if test $dstdir_status != 0; then
+    case $posix_mkdir in
+      '')
+	# Create intermediate dirs using mode 755 as modified by the umask.
+	# This is like FreeBSD 'install' as of 1997-10-28.
+	umask=`umask`
+	case $stripcmd.$umask in
+	  # Optimize common cases.
+	  *[2367][2367]) mkdir_umask=$umask;;
+	  .*0[02][02] | .[02][02] | .[02]) mkdir_umask=22;;
+
+	  *[0-7])
+	    mkdir_umask=`expr $umask + 22 \
+	      - $umask % 100 % 40 + $umask % 20 \
+	      - $umask % 10 % 4 + $umask % 2
+	    `;;
+	  *) mkdir_umask=$umask,go-w;;
+	esac
+
+	# With -d, create the new directory with the user-specified mode.
+	# Otherwise, rely on $mkdir_umask.
+	if test -n "$dir_arg"; then
+	  mkdir_mode=-m$mode
+	else
+	  mkdir_mode=
+	fi
+
+	posix_mkdir=false
+	case $umask in
+	  *[123567][0-7][0-7])
+	    # POSIX mkdir -p sets u+wx bits regardless of umask, which
+	    # is incompatible with FreeBSD 'install' when (umask & 300) != 0.
+	    ;;
+	  *)
+	    tmpdir=${TMPDIR-/tmp}/ins$RANDOM-$$
+	    trap 'ret=$?; rmdir "$tmpdir/d" "$tmpdir" 2>/dev/null; exit $ret' 0
+
+	    if (umask $mkdir_umask &&
+		exec $mkdirprog $mkdir_mode -p -- "$tmpdir/d") >/dev/null 2>&1
+	    then
+	      if test -z "$dir_arg" || {
+		   # Check for POSIX incompatibilities with -m.
+		   # HP-UX 11.23 and IRIX 6.5 mkdir -m -p sets group- or
+		   # other-writeable bit of parent directory when it shouldn't.
+		   # FreeBSD 6.1 mkdir -m -p sets mode of existing directory.
+		   ls_ld_tmpdir=`ls -ld "$tmpdir"`
+		   case $ls_ld_tmpdir in
+		     d????-?r-*) different_mode=700;;
+		     d????-?--*) different_mode=755;;
+		     *) false;;
+		   esac &&
+		   $mkdirprog -m$different_mode -p -- "$tmpdir" && {
+		     ls_ld_tmpdir_1=`ls -ld "$tmpdir"`
+		     test "$ls_ld_tmpdir" = "$ls_ld_tmpdir_1"
+		   }
+		 }
+	      then posix_mkdir=:
+	      fi
+	      rmdir "$tmpdir/d" "$tmpdir"
+	    else
+	      # Remove any dirs left behind by ancient mkdir implementations.
+	      rmdir ./$mkdir_mode ./-p ./-- 2>/dev/null
+	    fi
+	    trap '' 0;;
+	esac;;
+    esac
+
+    if
+      $posix_mkdir && (
+	umask $mkdir_umask &&
+	$doit_exec $mkdirprog $mkdir_mode -p -- "$dstdir"
+      )
+    then :
+    else
+
+      # The umask is ridiculous, or mkdir does not conform to POSIX,
+      # or it failed possibly due to a race condition.  Create the
+      # directory the slow way, step by step, checking for races as we go.
+
+      case $dstdir in
+	/*) prefix='/';;
+	-*) prefix='./';;
+	*)  prefix='';;
+      esac
+
+      eval "$initialize_posix_glob"
+
+      oIFS=$IFS
+      IFS=/
+      $posix_glob set -f
+      set fnord $dstdir
+      shift
+      $posix_glob set +f
+      IFS=$oIFS
+
+      prefixes=
+
+      for d
+      do
+	test -z "$d" && continue
+
+	prefix=$prefix$d
+	if test -d "$prefix"; then
+	  prefixes=
+	else
+	  if $posix_mkdir; then
+	    (umask=$mkdir_umask &&
+	     $doit_exec $mkdirprog $mkdir_mode -p -- "$dstdir") && break
+	    # Don't fail if two instances are running concurrently.
+	    test -d "$prefix" || exit 1
+	  else
+	    case $prefix in
+	      *\'*) qprefix=`echo "$prefix" | sed "s/'/'\\\\\\\\''/g"`;;
+	      *) qprefix=$prefix;;
+	    esac
+	    prefixes="$prefixes '$qprefix'"
+	  fi
+	fi
+	prefix=$prefix/
+      done
+
+      if test -n "$prefixes"; then
+	# Don't fail if two instances are running concurrently.
+	(umask $mkdir_umask &&
+	 eval "\$doit_exec \$mkdirprog $prefixes") ||
+	  test -d "$dstdir" || exit 1
+	obsolete_mkdir_used=true
+      fi
+    fi
+  fi
+
+  if test -n "$dir_arg"; then
+    { test -z "$chowncmd" || $doit $chowncmd "$dst"; } &&
+    { test -z "$chgrpcmd" || $doit $chgrpcmd "$dst"; } &&
+    { test "$obsolete_mkdir_used$chowncmd$chgrpcmd" = false ||
+      test -z "$chmodcmd" || $doit $chmodcmd $mode "$dst"; } || exit 1
+  else
+
+    # Make a couple of temp file names in the proper directory.
+    dsttmp=$dstdir/_inst.$$_
+    rmtmp=$dstdir/_rm.$$_
+
+    # Trap to clean up those temp files at exit.
+    trap 'ret=$?; rm -f "$dsttmp" "$rmtmp" && exit $ret' 0
+
+    # Copy the file name to the temp name.
+    (umask $cp_umask && $doit_exec $cpprog "$src" "$dsttmp") &&
+
+    # and set any options; do chmod last to preserve setuid bits.
+    #
+    # If any of these fail, we abort the whole thing.  If we want to
+    # ignore errors from any of these, just make sure not to ignore
+    # errors from the above "$doit $cpprog $src $dsttmp" command.
+    #
+    { test -z "$chowncmd" || $doit $chowncmd "$dsttmp"; } &&
+    { test -z "$chgrpcmd" || $doit $chgrpcmd "$dsttmp"; } &&
+    { test -z "$stripcmd" || $doit $stripcmd "$dsttmp"; } &&
+    { test -z "$chmodcmd" || $doit $chmodcmd $mode "$dsttmp"; } &&
+
+    # If -C, don't bother to copy if it wouldn't change the file.
+    if $copy_on_change &&
+       old=`LC_ALL=C ls -dlL "$dst"	2>/dev/null` &&
+       new=`LC_ALL=C ls -dlL "$dsttmp"	2>/dev/null` &&
+
+       eval "$initialize_posix_glob" &&
+       $posix_glob set -f &&
+       set X $old && old=:$2:$4:$5:$6 &&
+       set X $new && new=:$2:$4:$5:$6 &&
+       $posix_glob set +f &&
+
+       test "$old" = "$new" &&
+       $cmpprog "$dst" "$dsttmp" >/dev/null 2>&1
+    then
+      rm -f "$dsttmp"
+    else
+      # Rename the file to the real destination.
+      $doit $mvcmd -f "$dsttmp" "$dst" 2>/dev/null ||
+
+      # The rename failed, perhaps because mv can't rename something else
+      # to itself, or perhaps because mv is so ancient that it does not
+      # support -f.
+      {
+	# Now remove or move aside any old file at destination location.
+	# We try this two ways since rm can't unlink itself on some
+	# systems and the destination file might be busy for other
+	# reasons.  In this case, the final cleanup might fail but the new
+	# file should still install successfully.
+	{
+	  test ! -f "$dst" ||
+	  $doit $rmcmd -f "$dst" 2>/dev/null ||
+	  { $doit $mvcmd -f "$dst" "$rmtmp" 2>/dev/null &&
+	    { $doit $rmcmd -f "$rmtmp" 2>/dev/null; :; }
+	  } ||
+	  { echo "$0: cannot unlink or rename $dst" >&2
+	    (exit 1); exit 1
+	  }
+	} &&
+
+	# Now rename the file to the real destination.
+	$doit $mvcmd "$dsttmp" "$dst"
+      }
+    fi || exit 1
+
+    trap '' 0
+  fi
+done
+
+# Local variables:
+# eval: (add-hook 'write-file-hooks 'time-stamp)
+# time-stamp-start: "scriptversion="
+# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-time-zone: "UTC"
+# time-stamp-end: "; # UTC"
+# End:

libart-2.0-uninstalled.pc.in

@@ -0,0 +1,10 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: libart
+Description: LGPL version of the libart library
+Version: @VERSION@
+Libs: ${pc_top_builddir}/${pcfiledir}/libart_lgpl_2.la
+Cflags: -I${pc_top_builddir}/${pcfiledir}

libart-2.0.pc.in

@@ -0,0 +1,10 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: libart
+Description: LGPL version of the libart library
+Version: @VERSION@
+Libs: -L${libdir} -lart_lgpl_2
+Cflags: -I${includedir}/libart-2.0

libart-config.in

@@ -0,0 +1,56 @@
+#!/bin/sh
+
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+exec_prefix_set=no
+
+usage="\
+Usage: libart-config [--prefix[=DIR]] [--exec-prefix[=DIR]] [--version] [--libs] [--cflags]"
+
+if test $# -eq 0; then
+      echo "${usage}" 1>&2
+      exit 1
+fi
+
+while test $# -gt 0; do
+  case "$1" in
+  -*=*) optarg=`echo "$1" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
+  *) optarg= ;;
+  esac
+
+  case $1 in
+    --prefix=*)
+      prefix=$optarg
+      if test $exec_prefix_set = no ; then
+        exec_prefix=$optarg
+      fi
+      ;;
+    --prefix)
+      echo $prefix
+      ;;
+    --exec-prefix=*)
+      exec_prefix=$optarg
+      exec_prefix_set=yes
+      ;;
+    --exec-prefix)
+      echo $exec_prefix
+      ;;
+    --version)
+      echo @LIBART_VERSION@
+      ;;
+    --cflags)
+      includes=-I@includedir@/libart-2.0
+      echo $includes
+      ;;
+    --libs)
+      libdirs=-L@libdir@
+      echo $libdirs -lart_lgpl_2 -lm
+      ;;
+    *)
+      echo "${usage}" 1>&2
+      exit 1
+      ;;
+  esac
+  shift
+done
+

libart-features.c

@@ -0,0 +1,18 @@
+#include "libart-features.h"
+
+/* General initialization hooks */
+const unsigned int libart_major_version=LIBART_MAJOR_VERSION,
+  libart_minor_version=LIBART_MINOR_VERSION,
+  libart_micro_version=LIBART_MICRO_VERSION;
+
+const char *libart_version = LIBART_VERSION;
+
+void
+libart_preinit(void *app, void *modinfo)
+{
+}
+
+void
+libart_postinit(void *app, void *modinfo)
+{
+}

libart-features.h

@@ -0,0 +1,24 @@
+#ifndef LIBART_FEATURES_H
+#define LIBART_FEATURES_H 1
+
+#define LIBART_MAJOR_VERSION (2)
+#define LIBART_MINOR_VERSION (3)
+#define LIBART_MICRO_VERSION (21)
+#define LIBART_VERSION "2.3.21"
+
+#ifdef _WIN32
+#  ifdef LIBART_COMPILATION
+#    define LIBART_VAR __declspec(dllexport)
+#  else
+#    define LIBART_VAR extern __declspec(dllimport)
+#  endif
+#else
+#  define LIBART_VAR extern
+#endif
+
+LIBART_VAR const unsigned int libart_major_version, libart_minor_version, libart_micro_version;
+LIBART_VAR const char *libart_version;
+
+void libart_preinit(void *app, void *modinfo);
+void libart_postinit(void *app, void *modinfo);
+#endif

libart-features.h.in

@@ -0,0 +1,24 @@
+#ifndef LIBART_FEATURES_H
+#define LIBART_FEATURES_H 1
+
+#define LIBART_MAJOR_VERSION (@LIBART_MAJOR_VERSION@)
+#define LIBART_MINOR_VERSION (@LIBART_MINOR_VERSION@)
+#define LIBART_MICRO_VERSION (@LIBART_MICRO_VERSION@)
+#define LIBART_VERSION "@LIBART_VERSION@"
+
+#ifdef _WIN32
+#  ifdef LIBART_COMPILATION
+#    define LIBART_VAR __declspec(dllexport)
+#  else
+#    define LIBART_VAR extern __declspec(dllimport)
+#  endif
+#else
+#  define LIBART_VAR extern
+#endif
+
+LIBART_VAR const unsigned int libart_major_version, libart_minor_version, libart_micro_version;
+LIBART_VAR const char *libart_version;
+
+void libart_preinit(void *app, void *modinfo);
+void libart_postinit(void *app, void *modinfo);
+#endif

libart-zip.in

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+# Build zipfiles for libart_lgpl on Win32, runtime and developer.
+
+ZIP=/tmp/libart_lgpl-@LIBART_VERSION@.zip
+DEVZIP=/tmp/libart_lgpl-dev-@LIBART_VERSION@.zip
+cd @prefix@
+
+rm $ZIP
+
+DLLDIR=lib
+[ -f bin/libart_lgpl_2-@LIBART_MAJOR_VERSION@.dll ] && DLLDIR=bin
+
+zip -r $ZIP -@ <<EOF
+$DLLDIR/libart_lgpl_2-@LIBART_MAJOR_VERSION@.dll
+EOF
+
+rm $DEVZIP
+zip -r $DEVZIP -@ <<EOF
+include/libart-2.0
+lib/libart_lgpl_2.dll.a
+lib/art_lgpl_2.lib
+lib/pkgconfig/libart-2.0.pc
+EOF

libart.def

@@ -0,0 +1,124 @@
+EXPORTS
+ art_affine_equal
+ art_affine_expansion
+ art_affine_flip
+ art_affine_identity
+ art_affine_invert
+ art_affine_multiply
+ art_affine_point
+ art_affine_rectilinear
+ art_affine_rotate
+ art_affine_scale
+ art_affine_shear
+ art_affine_to_string
+ art_affine_translate
+ art_alphagamma_free
+ art_alphagamma_new
+ art_bez_path_to_vec
+ art_bezier_to_vec
+ art_bpath_affine_transform
+ art_die
+ art_dprint
+ art_drect_affine_transform
+ art_drect_copy
+ art_drect_empty
+ art_drect_intersect
+ art_drect_svp
+ art_drect_svp_union
+ art_drect_to_irect
+ art_drect_union
+ art_gray_svp_aa
+ art_irect_copy
+ art_irect_empty
+ art_irect_intersect
+ art_irect_union
+ art_pixbuf_duplicate
+ art_pixbuf_free
+ art_pixbuf_free_shallow
+ art_pixbuf_new_const_rgb
+ art_pixbuf_new_const_rgba
+ art_pixbuf_new_rgb
+ art_pixbuf_new_rgb_dnotify
+ art_pixbuf_new_rgba
+ art_pixbuf_new_rgba_dnotify
+ art_rect_list_from_uta
+ art_render_add_image_source
+ art_render_add_mask_source
+ art_render_clear
+ art_render_clear_16_obj
+ art_render_clear_8_obj
+ art_render_clear_rgb
+ art_render_clear_rgb8_obj
+ art_render_composite_8_obj
+ art_render_composite_8_opt1_obj
+ art_render_composite_8_opt2_obj
+ art_render_composite_obj
+ art_render_gradient_linear
+ art_render_gradient_radial
+ art_render_image_solid
+ art_render_invoke
+ art_render_invoke_callbacks
+ art_render_mask
+ art_render_mask_solid
+ art_render_new
+ art_render_svp
+ art_rgb_a_affine
+ art_rgba_rgba_composite
+ art_rgba_fill_run
+ art_rgba_run_alpha
+ art_rgb_affine
+ art_rgb_affine_run
+ art_rgb_bitmap_affine
+ art_rgb_fill_run
+ art_rgb_pixbuf_affine
+ art_rgb_rgba_affine
+ art_rgb_run_alpha
+ art_rgb_svp_aa
+ art_rgb_svp_alpha
+ art_svp_add_segment
+ art_svp_diff
+ art_svp_free
+ art_svp_from_vpath
+ art_svp_intersect
+ art_svp_intersector
+ art_svp_minus
+ art_svp_point_dist
+ art_svp_point_wind
+ art_svp_render_aa
+ art_svp_render_aa_iter
+ art_svp_render_aa_iter_done
+ art_svp_render_aa_iter_step
+ art_svp_rewind_uncrossed
+ art_svp_seg_compare
+ art_svp_uncross
+ art_svp_union
+ art_svp_vpath_stroke
+ art_svp_vpath_stroke_raw
+ art_svp_writer_rewind_new
+ art_svp_writer_rewind_reap
+ art_uta_add_line
+ art_uta_free
+ art_uta_from_irect
+ art_uta_from_svp
+ art_uta_from_vpath
+ art_uta_new
+ art_uta_new_coords
+ art_uta_union
+ art_vpath_add_point
+ art_vpath_affine_transform
+ art_vpath_bbox_drect
+ art_vpath_bbox_irect
+ art_vpath_dash
+ art_vpath_from_svp
+ art_vpath_new_circle
+ art_vpath_perturb
+ art_warn
+ art_alloc
+ art_free
+ art_realloc
+ libart_major_version
+ libart_micro_version
+ libart_minor_version
+ libart_postinit
+ libart_preinit
+ libart_version

libart.h

@@ -0,0 +1,39 @@
+#ifndef LIBART_H
+#define LIBART_H 1
+
+#include <libart_lgpl/art_affine.h>
+#include <libart_lgpl/art_alphagamma.h>
+#include <libart_lgpl/art_bpath.h>
+#include <libart_lgpl/art_filterlevel.h>
+#include <libart_lgpl/art_gray_svp.h>
+#include <libart_lgpl/art_misc.h>
+#include <libart_lgpl/art_pathcode.h>
+#include <libart_lgpl/art_pixbuf.h>
+#include <libart_lgpl/art_point.h>
+#include <libart_lgpl/art_rect.h>
+#include <libart_lgpl/art_rect_svp.h>
+#include <libart_lgpl/art_rect_uta.h>
+#include <libart_lgpl/art_rgb.h>
+#include <libart_lgpl/art_rgb_affine.h>
+#include <libart_lgpl/art_rgb_bitmap_affine.h>
+#include <libart_lgpl/art_rgb_pixbuf_affine.h>
+#include <libart_lgpl/art_rgb_rgba_affine.h>
+#include <libart_lgpl/art_rgb_svp.h>
+#include <libart_lgpl/art_svp.h>
+#include <libart_lgpl/art_svp_ops.h>
+#include <libart_lgpl/art_svp_point.h>
+#include <libart_lgpl/art_svp_render_aa.h>
+#include <libart_lgpl/art_svp_vpath.h>
+#include <libart_lgpl/art_svp_vpath_stroke.h>
+#include <libart_lgpl/art_svp_wind.h>
+#include <libart_lgpl/art_uta.h>
+#include <libart_lgpl/art_uta_ops.h>
+#include <libart_lgpl/art_uta_rect.h>
+#include <libart_lgpl/art_uta_svp.h>
+#include <libart_lgpl/art_uta_vpath.h>
+#include <libart_lgpl/art_vpath.h>
+#include <libart_lgpl/art_vpath_bpath.h>
+#include <libart_lgpl/art_vpath_dash.h>
+#include <libart_lgpl/art_vpath_svp.h>
+
+#endif

missing

@@ -0,0 +1,376 @@
+#! /bin/sh
+# Common stub for a few missing GNU programs while installing.
+
+scriptversion=2009-04-28.21; # UTC
+
+# Copyright (C) 1996, 1997, 1999, 2000, 2002, 2003, 2004, 2005, 2006,
+# 2008, 2009 Free Software Foundation, Inc.
+# Originally by Fran,cois Pinard <pinard@iro.umontreal.ca>, 1996.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# As a special exception to the GNU General Public License, if you
+# distribute this file as part of a program that contains a
+# configuration script generated by Autoconf, you may include it under
+# the same distribution terms that you use for the rest of that program.
+
+if test $# -eq 0; then
+  echo 1>&2 "Try \`$0 --help' for more information"
+  exit 1
+fi
+
+run=:
+sed_output='s/.* --output[ =]\([^ ]*\).*/\1/p'
+sed_minuso='s/.* -o \([^ ]*\).*/\1/p'
+
+# In the cases where this matters, `missing' is being run in the
+# srcdir already.
+if test -f configure.ac; then
+  configure_ac=configure.ac
+else
+  configure_ac=configure.in
+fi
+
+msg="missing on your system"
+
+case $1 in
+--run)
+  # Try to run requested program, and just exit if it succeeds.
+  run=
+  shift
+  "$@" && exit 0
+  # Exit code 63 means version mismatch.  This often happens
+  # when the user try to use an ancient version of a tool on
+  # a file that requires a minimum version.  In this case we
+  # we should proceed has if the program had been absent, or
+  # if --run hadn't been passed.
+  if test $? = 63; then
+    run=:
+    msg="probably too old"
+  fi
+  ;;
+
+  -h|--h|--he|--hel|--help)
+    echo "\
+$0 [OPTION]... PROGRAM [ARGUMENT]...
+
+Handle \`PROGRAM [ARGUMENT]...' for when PROGRAM is missing, or return an
+error status if there is no known handling for PROGRAM.
+
+Options:
+  -h, --help      display this help and exit
+  -v, --version   output version information and exit
+  --run           try to run the given command, and emulate it if it fails
+
+Supported PROGRAM values:
+  aclocal      touch file \`aclocal.m4'
+  autoconf     touch file \`configure'
+  autoheader   touch file \`config.h.in'
+  autom4te     touch the output file, or create a stub one
+  automake     touch all \`Makefile.in' files
+  bison        create \`y.tab.[ch]', if possible, from existing .[ch]
+  flex         create \`lex.yy.c', if possible, from existing .c
+  help2man     touch the output file
+  lex          create \`lex.yy.c', if possible, from existing .c
+  makeinfo     touch the output file
+  tar          try tar, gnutar, gtar, then tar without non-portable flags
+  yacc         create \`y.tab.[ch]', if possible, from existing .[ch]
+
+Version suffixes to PROGRAM as well as the prefixes \`gnu-', \`gnu', and
+\`g' are ignored when checking the name.
+
+Send bug reports to <bug-automake@gnu.org>."
+    exit $?
+    ;;
+
+  -v|--v|--ve|--ver|--vers|--versi|--versio|--version)
+    echo "missing $scriptversion (GNU Automake)"
+    exit $?
+    ;;
+
+  -*)
+    echo 1>&2 "$0: Unknown \`$1' option"
+    echo 1>&2 "Try \`$0 --help' for more information"
+    exit 1
+    ;;
+
+esac
+
+# normalize program name to check for.
+program=`echo "$1" | sed '
+  s/^gnu-//; t
+  s/^gnu//; t
+  s/^g//; t'`
+
+# Now exit if we have it, but it failed.  Also exit now if we
+# don't have it and --version was passed (most likely to detect
+# the program).  This is about non-GNU programs, so use $1 not
+# $program.
+case $1 in
+  lex*|yacc*)
+    # Not GNU programs, they don't have --version.
+    ;;
+
+  tar*)
+    if test -n "$run"; then
+       echo 1>&2 "ERROR: \`tar' requires --run"
+       exit 1
+    elif test "x$2" = "x--version" || test "x$2" = "x--help"; then
+       exit 1
+    fi
+    ;;
+
+  *)
+    if test -z "$run" && ($1 --version) > /dev/null 2>&1; then
+       # We have it, but it failed.
+       exit 1
+    elif test "x$2" = "x--version" || test "x$2" = "x--help"; then
+       # Could not run --version or --help.  This is probably someone
+       # running `$TOOL --version' or `$TOOL --help' to check whether
+       # $TOOL exists and not knowing $TOOL uses missing.
+       exit 1
+    fi
+    ;;
+esac
+
+# If it does not exist, or fails to run (possibly an outdated version),
+# try to emulate it.
+case $program in
+  aclocal*)
+    echo 1>&2 "\
+WARNING: \`$1' is $msg.  You should only need it if
+         you modified \`acinclude.m4' or \`${configure_ac}'.  You might want
+         to install the \`Automake' and \`Perl' packages.  Grab them from
+         any GNU archive site."
+    touch aclocal.m4
+    ;;
+
+  autoconf*)
+    echo 1>&2 "\
+WARNING: \`$1' is $msg.  You should only need it if
+         you modified \`${configure_ac}'.  You might want to install the
+         \`Autoconf' and \`GNU m4' packages.  Grab them from any GNU
+         archive site."
+    touch configure
+    ;;
+
+  autoheader*)
+    echo 1>&2 "\
+WARNING: \`$1' is $msg.  You should only need it if
+         you modified \`acconfig.h' or \`${configure_ac}'.  You might want
+         to install the \`Autoconf' and \`GNU m4' packages.  Grab them
+         from any GNU archive site."
+    files=`sed -n 's/^[ ]*A[CM]_CONFIG_HEADER(\([^)]*\)).*/\1/p' ${configure_ac}`
+    test -z "$files" && files="config.h"
+    touch_files=
+    for f in $files; do
+      case $f in
+      *:*) touch_files="$touch_files "`echo "$f" |
+				       sed -e 's/^[^:]*://' -e 's/:.*//'`;;
+      *) touch_files="$touch_files $f.in";;
+      esac
+    done
+    touch $touch_files
+    ;;
+
+  automake*)
+    echo 1>&2 "\
+WARNING: \`$1' is $msg.  You should only need it if
+         you modified \`Makefile.am', \`acinclude.m4' or \`${configure_ac}'.
+         You might want to install the \`Automake' and \`Perl' packages.
+         Grab them from any GNU archive site."
+    find . -type f -name Makefile.am -print |
+	   sed 's/\.am$/.in/' |
+	   while read f; do touch "$f"; done
+    ;;
+
+  autom4te*)
+    echo 1>&2 "\
+WARNING: \`$1' is needed, but is $msg.
+         You might have modified some files without having the
+         proper tools for further handling them.
+         You can get \`$1' as part of \`Autoconf' from any GNU
+         archive site."
+
+    file=`echo "$*" | sed -n "$sed_output"`
+    test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
+    if test -f "$file"; then
+	touch $file
+    else
+	test -z "$file" || exec >$file
+	echo "#! /bin/sh"
+	echo "# Created by GNU Automake missing as a replacement of"
+	echo "#  $ $@"
+	echo "exit 0"
+	chmod +x $file
+	exit 1
+    fi
+    ;;
+
+  bison*|yacc*)
+    echo 1>&2 "\
+WARNING: \`$1' $msg.  You should only need it if
+         you modified a \`.y' file.  You may need the \`Bison' package
+         in order for those modifications to take effect.  You can get
+         \`Bison' from any GNU archive site."
+    rm -f y.tab.c y.tab.h
+    if test $# -ne 1; then
+        eval LASTARG="\${$#}"
+	case $LASTARG in
+	*.y)
+	    SRCFILE=`echo "$LASTARG" | sed 's/y$/c/'`
+	    if test -f "$SRCFILE"; then
+	         cp "$SRCFILE" y.tab.c
+	    fi
+	    SRCFILE=`echo "$LASTARG" | sed 's/y$/h/'`
+	    if test -f "$SRCFILE"; then
+	         cp "$SRCFILE" y.tab.h
+	    fi
+	  ;;
+	esac
+    fi
+    if test ! -f y.tab.h; then
+	echo >y.tab.h
+    fi
+    if test ! -f y.tab.c; then
+	echo 'main() { return 0; }' >y.tab.c
+    fi
+    ;;
+
+  lex*|flex*)
+    echo 1>&2 "\
+WARNING: \`$1' is $msg.  You should only need it if
+         you modified a \`.l' file.  You may need the \`Flex' package
+         in order for those modifications to take effect.  You can get
+         \`Flex' from any GNU archive site."
+    rm -f lex.yy.c
+    if test $# -ne 1; then
+        eval LASTARG="\${$#}"
+	case $LASTARG in
+	*.l)
+	    SRCFILE=`echo "$LASTARG" | sed 's/l$/c/'`
+	    if test -f "$SRCFILE"; then
+	         cp "$SRCFILE" lex.yy.c
+	    fi
+	  ;;
+	esac
+    fi
+    if test ! -f lex.yy.c; then
+	echo 'main() { return 0; }' >lex.yy.c
+    fi
+    ;;
+
+  help2man*)
+    echo 1>&2 "\
+WARNING: \`$1' is $msg.  You should only need it if
+	 you modified a dependency of a manual page.  You may need the
+	 \`Help2man' package in order for those modifications to take
+	 effect.  You can get \`Help2man' from any GNU archive site."
+
+    file=`echo "$*" | sed -n "$sed_output"`
+    test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
+    if test -f "$file"; then
+	touch $file
+    else
+	test -z "$file" || exec >$file
+	echo ".ab help2man is required to generate this page"
+	exit $?
+    fi
+    ;;
+
+  makeinfo*)
+    echo 1>&2 "\
+WARNING: \`$1' is $msg.  You should only need it if
+         you modified a \`.texi' or \`.texinfo' file, or any other file
+         indirectly affecting the aspect of the manual.  The spurious
+         call might also be the consequence of using a buggy \`make' (AIX,
+         DU, IRIX).  You might want to install the \`Texinfo' package or
+         the \`GNU make' package.  Grab either from any GNU archive site."
+    # The file to touch is that specified with -o ...
+    file=`echo "$*" | sed -n "$sed_output"`
+    test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
+    if test -z "$file"; then
+      # ... or it is the one specified with @setfilename ...
+      infile=`echo "$*" | sed 's/.* \([^ ]*\) *$/\1/'`
+      file=`sed -n '
+	/^@setfilename/{
+	  s/.* \([^ ]*\) *$/\1/
+	  p
+	  q
+	}' $infile`
+      # ... or it is derived from the source name (dir/f.texi becomes f.info)
+      test -z "$file" && file=`echo "$infile" | sed 's,.*/,,;s,.[^.]*$,,'`.info
+    fi
+    # If the file does not exist, the user really needs makeinfo;
+    # let's fail without touching anything.
+    test -f $file || exit 1
+    touch $file
+    ;;
+
+  tar*)
+    shift
+
+    # We have already tried tar in the generic part.
+    # Look for gnutar/gtar before invocation to avoid ugly error
+    # messages.
+    if (gnutar --version > /dev/null 2>&1); then
+       gnutar "$@" && exit 0
+    fi
+    if (gtar --version > /dev/null 2>&1); then
+       gtar "$@" && exit 0
+    fi
+    firstarg="$1"
+    if shift; then
+	case $firstarg in
+	*o*)
+	    firstarg=`echo "$firstarg" | sed s/o//`
+	    tar "$firstarg" "$@" && exit 0
+	    ;;
+	esac
+	case $firstarg in
+	*h*)
+	    firstarg=`echo "$firstarg" | sed s/h//`
+	    tar "$firstarg" "$@" && exit 0
+	    ;;
+	esac
+    fi
+
+    echo 1>&2 "\
+WARNING: I can't seem to be able to run \`tar' with the given arguments.
+         You may want to install GNU tar or Free paxutils, or check the
+         command line arguments."
+    exit 1
+    ;;
+
+  *)
+    echo 1>&2 "\
+WARNING: \`$1' is needed, and is $msg.
+         You might have modified some files without having the
+         proper tools for further handling them.  Check the \`README' file,
+         it often tells you about the needed prerequisites for installing
+         this package.  You may also peek at any GNU archive site, in case
+         some other package would contain this missing \`$1' program."
+    exit 1
+    ;;
+esac
+
+exit 0
+
+# Local variables:
+# eval: (add-hook 'write-file-hooks 'time-stamp)
+# time-stamp-start: "scriptversion="
+# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-time-zone: "UTC"
+# time-stamp-end: "; # UTC"
+# End:

testart.c

@@ -0,0 +1,636 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998, 1999 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include "art_misc.h"
+#include "art_vpath.h"
+#include "art_svp.h"
+#include "art_svp_vpath.h"
+#include "art_gray_svp.h"
+#include "art_rgb_svp.h"
+#include "art_svp_vpath_stroke.h"
+#include "art_svp_ops.h"
+#include "art_affine.h"
+#include "art_rgb_affine.h"
+#include "art_rgb_bitmap_affine.h"
+#include "art_rgb_rgba_affine.h"
+#include "art_alphagamma.h"
+#include "art_svp_point.h"
+#include "art_vpath_dash.h"
+#include "art_render.h"
+#include "art_render_gradient.h"
+#include "art_render_svp.h"
+#include "art_svp_intersect.h"
+
+#ifdef DEAD_CODE
+static void
+test_affine (void) {
+  double src[6];
+  double dst[6];
+  double src2[6];
+  char str[128];
+  int i;
+  ArtPoint ps, pd, ptmp;
+
+  for (i = 0; i < 6; i++)
+    {
+      src[i] = (rand () * 2.0 / RAND_MAX) - 1.0;
+      src2[i] = (rand () * 2.0 / RAND_MAX) - 1.0;
+    }
+#if 0
+  src[0] = 0.9999999;
+  src[1] = -0.000001;
+  src[2] = 0.000001;
+  src[3] = 0.9999999;
+  src[4] = 0;
+  src[5] = 0;
+#if 1
+  src[0] = 0.98480775;
+  src[1] = -0.17364818;
+  src[2] = 0.17364818;
+  src[3] = 0.98480775;
+#endif
+
+  src2[0] = 0.98480775;
+  src2[1] = -0.17364818;
+  src2[2] = 0.17364818;
+  src2[3] = 0.98480775;
+#endif
+
+
+  ps.x = rand() * 100.0 / RAND_MAX;
+  ps.y = rand() * 100.0 / RAND_MAX;
+
+  art_affine_point (&pd, &ps, src);
+  art_affine_invert (dst, src);
+  art_affine_point (&ptmp, &pd, dst);
+  art_affine_to_string (str, src);
+  printf ("src = %s\n", str);
+  art_affine_to_string (str, dst);
+  printf ("dst = %s\n", str);
+  printf ("point (%g, %g) -> (%g, %g) -> (%g, %g)\n",
+	  ps.x, ps.y, pd.x, pd.y, ptmp.x, ptmp.y);
+
+  art_affine_point (&ptmp, &ps, src);
+  art_affine_point (&pd, &ptmp, src2);
+  art_affine_to_string (str, src2);
+  printf ("src2 = %s\n", str);
+  printf ("point (%g, %g) -> (%g, %g) -> (%g, %g)\n",
+	  ps.x, ps.y, ptmp.x, ptmp.y, pd.x, pd.y);
+  art_affine_multiply (dst, src, src2);
+  art_affine_to_string (str, dst);
+  printf ("dst = %s\n", str);
+  art_affine_point (&pd, &ps, dst);
+  printf ("point (%g, %g) -> (%g, %g)\n",
+	  ps.x, ps.y, pd.x, pd.y);
+
+}
+#endif
+
+static ArtVpath *
+randstar (int n)
+{
+  ArtVpath *vec;
+  int i;
+  double r, th;
+
+  vec = art_new (ArtVpath, n + 2);
+  for (i = 0; i < n; i++)
+    {
+      vec[i].code = i ? ART_LINETO : ART_MOVETO;
+      r = rand () * (250.0 / RAND_MAX);
+#if 0
+      r = r + 0.9 * (250 - r);
+#endif
+      th = i * 2 * M_PI / n;
+      vec[i].x = 250 + r * cos (th);
+      vec[i].y = 250 - r * sin (th);
+    }
+  vec[i].code = ART_LINETO;
+  vec[i].x = vec[0].x;
+  vec[i].y = vec[0].y;
+  i++;
+  vec[i].code = ART_END;
+  vec[i].x = 0;
+  vec[i].y = 0;
+  return vec;
+}
+
+#define TILE_SIZE 512
+#define NUM_ITERS 1
+#define COLOR
+
+#ifdef COLOR
+#define BYTES_PP 3
+#else
+#define BYTES_PP 1
+#endif
+
+#ifndef nDEAD_CODE
+static void
+print_svp (ArtSVP *vp)
+{
+  int i, j;
+
+  for (i = 0; i < vp->n_segs; i++)
+    {
+      printf ("segment %d, dir = %s (%f, %f) - (%f, %f)\n",
+	      i, vp->segs[i].dir ? "down" : "up",
+	      vp->segs[i].bbox.x0,
+	      vp->segs[i].bbox.y0,
+	      vp->segs[i].bbox.x1,
+	      vp->segs[i].bbox.y1);
+      for (j = 0; j < vp->segs[i].n_points; j++)
+        printf ("  (%g, %g)\n",
+                vp->segs[i].points[j].x,
+                vp->segs[i].points[j].y);
+    }
+}
+#endif
+
+static void
+print_vpath (ArtVpath *vpath)
+{
+  int i;
+
+  for (i = 0; vpath[i].code != ART_END; i++)
+    printf ("%g %g %s\n",
+	    vpath[i].x, vpath[i].y,
+	    vpath[i].code == ART_MOVETO_OPEN ? "moveto %open" :
+	    vpath[i].code == ART_MOVETO ? "moveto" :
+	    vpath[i].code == ART_LINETO ? "lineto" :
+	    "?");
+
+  printf ("stroke\n");
+}
+
+static void
+make_testpat (void)
+{
+  ArtVpath *vpath, *vpath2, *vpath3;
+  ArtSVP *svp, *svp2;
+  ArtSVP *svp3;
+  art_u8 buf[512 * 512 * BYTES_PP];
+  int i, j;
+  int iter;
+  art_u8 colorimg[256][256][3];
+  art_u8 rgbaimg[256][256][4];
+  art_u8 bitimg[16][2];
+  int x, y;
+  double affine[6];
+  double affine2[6];
+  double affine3[6];
+  ArtAlphaGamma *alphagamma;
+  double dash_data[] = { 20 };
+  ArtVpathDash dash;
+
+  dash.offset = 0;
+  dash.n_dash = 1;
+  dash.dash = dash_data;
+
+#ifdef TEST_AFFINE
+  test_affine ();
+  exit (0);
+#endif
+
+  vpath = randstar (50);
+  svp = art_svp_from_vpath (vpath);
+  art_free (vpath);
+
+  vpath2 = randstar (50);
+#if 1
+  vpath3 = art_vpath_dash (vpath2, &dash);
+  art_free (vpath2);
+  svp2 = art_svp_vpath_stroke (vpath3,
+			       ART_PATH_STROKE_JOIN_MITER,
+			       ART_PATH_STROKE_CAP_BUTT,
+			       15,
+			       4,
+			       0.5);
+  art_free (vpath3);
+#else
+  svp2 = art_svp_from_vpath (vpath2);
+#endif
+
+#if 1
+  svp3 = art_svp_intersect (svp, svp2);
+#else
+  svp3 = svp2;
+#endif
+
+#if 0
+  print_svp (svp);
+#endif
+
+  for (y = 0; y < 256; y++)
+    for (x = 0; x < 256; x++)
+      {
+	colorimg[y][x][0] = (x + y) >> 1;
+	colorimg[y][x][1] = (x + (255 - y)) >> 1;
+	colorimg[y][x][2] = ((255 - x) + y) >> 1;
+
+	rgbaimg[y][x][0] = (x + y) >> 1;
+	rgbaimg[y][x][1] = (x + (255 - y)) >> 1;
+	rgbaimg[y][x][2] = ((255 - x) + y) >> 1;
+	rgbaimg[y][x][3] = y;
+      }
+
+  for (y = 0; y < 16; y++)
+    for (x = 0; x < 2; x++)
+      bitimg[y][x] = (x << 4) | y;
+
+  affine[0] = 0.5;
+  affine[1] = .2;
+  affine[2] = -.2;
+  affine[3] = 0.5;
+  affine[4] = 64;
+  affine[5] = 64;
+  
+  affine2[0] = 1;
+  affine2[1] = -.2;
+  affine2[2] = .2;
+  affine2[3] = 1;
+  affine2[4] = 128;
+  affine2[5] = 128;
+
+  affine3[0] = 5;
+  affine3[1] = -.2;
+  affine3[2] = .2;
+  affine3[3] = 5;
+  affine3[4] = 384;
+  affine3[5] = 32;
+
+#if 0
+  alphagamma = art_alphagamma_new (1.8);
+#else
+  alphagamma = NULL;
+#endif
+
+#ifdef COLOR
+  printf ("P6\n512 512\n255\n");
+#else
+  printf ("P5\n512 512\n255\n");
+#endif
+  for (iter = 0; iter < NUM_ITERS; iter++)
+    for (j = 0; j < 512; j += TILE_SIZE)
+      for (i = 0; i < 512; i += TILE_SIZE)
+	{
+#ifdef COLOR
+	  art_rgb_svp_aa (svp, i, j, i + TILE_SIZE, j + TILE_SIZE,
+			  0xffe0a0, 0x100040,
+			  buf + (j * 512 + i) * BYTES_PP, 512 * BYTES_PP,
+			  alphagamma);
+	  art_rgb_svp_alpha (svp2, i, j, i + TILE_SIZE, j + TILE_SIZE,
+			     0xff000080,
+			     buf + (j * 512 + i) * BYTES_PP, 512 * BYTES_PP,
+			     alphagamma);
+	  art_rgb_svp_alpha (svp3, i, j, i + TILE_SIZE, j + TILE_SIZE,
+			     0x00ff0080,
+			     buf + (j * 512 + i) * BYTES_PP, 512 * BYTES_PP,
+			     alphagamma);
+	  art_rgb_affine (buf + (j * 512 + i) * BYTES_PP,
+			  i, j, i + TILE_SIZE, j + TILE_SIZE, 512 * BYTES_PP,
+			  (art_u8 *)colorimg, 256, 256, 256 * 3,
+			  affine,
+			  ART_FILTER_NEAREST, alphagamma);
+	  art_rgb_rgba_affine (buf + (j * 512 + i) * BYTES_PP,
+			       i, j, i + TILE_SIZE, j + TILE_SIZE,
+			       512 * BYTES_PP,
+			       (art_u8 *)rgbaimg, 256, 256, 256 * 4,
+			       affine2,
+			       ART_FILTER_NEAREST, alphagamma);
+	  art_rgb_bitmap_affine (buf + (j * 512 + i) * BYTES_PP,
+				 i, j, i + TILE_SIZE, j + TILE_SIZE,
+				 512 * BYTES_PP,
+				 (art_u8 *)bitimg, 16, 16, 2,
+				 0xffff00ff,
+				 affine3,
+				 ART_FILTER_NEAREST, alphagamma);
+#else
+	  art_gray_svp_aa (svp, i, j, i + TILE_SIZE, j + TILE_SIZE,
+			   buf + (j * 512 + i) * BYTES_PP, 512 * BYTES_PP);
+#endif
+	}
+
+  art_svp_free (svp2);
+  art_svp_free (svp3);
+  art_svp_free (svp);
+
+#if 1
+  fwrite (buf, 1, 512 * 512 * BYTES_PP, stdout);
+#endif
+}
+
+static void
+test_dist (void)
+{
+  ArtVpath *vpath;
+  ArtSVP *svp;
+  art_u8 buf[512 * 512 * BYTES_PP];
+  int x, y;
+  int ix;
+  double dist;
+  int wind;
+
+  vpath = randstar (20);
+#ifdef NO_STROKE
+  svp = art_svp_from_vpath (vpath);
+#else
+  svp = art_svp_vpath_stroke (vpath,
+			       ART_PATH_STROKE_JOIN_MITER,
+			       ART_PATH_STROKE_CAP_BUTT,
+			       15,
+			       4,
+			       0.5);
+#endif
+
+  art_rgb_svp_aa (svp, 0, 0, 512, 512,
+		  0xffe0a0, 0x100040,
+		  buf, 512 * BYTES_PP,
+		  NULL);
+
+  ix = 0;
+  for (y = 0; y < 512; y++)
+    {
+      for (x = 0; x < 512; x++)
+	{
+	  wind = art_svp_point_wind (svp, x, y);
+	  buf[ix] = 204 - wind * 51;
+	  dist = art_svp_point_dist (svp, x, y);
+	  if (((x | y) & 0x3f) == 0)
+	    {
+	      fprintf (stderr, "%d,%d: %f\n", x, y, dist);
+	    }
+	  buf[ix + 1] = 255 - dist;
+	  ix += 3;
+	}
+    }
+
+  printf ("P6\n512 512\n255\n");
+  fwrite (buf, 1, 512 * 512 * BYTES_PP, stdout);
+
+}
+
+static void
+test_dash (void)
+{
+  ArtVpath *vpath, *vpath2;
+  double dash_data[] = { 10, 4, 1, 4};
+  ArtVpathDash dash;
+	  
+  dash.offset = 0;
+  dash.n_dash = 3;
+  dash.dash = dash_data;
+  
+  vpath = randstar (50);
+  vpath2 = art_vpath_dash (vpath, &dash);
+  printf ("%%!\n");
+  print_vpath (vpath2);
+  printf ("showpage\n");
+  art_free (vpath);
+  art_free (vpath2);
+}
+
+static void
+test_render_gradient (art_u8 *buf)
+{
+  ArtGradientLinear gradient;
+  ArtGradientStop stops[3] = {
+    { 0.0, { 0x7fff, 0x0000, 0x0000, 0x7fff }},
+    { 0.5, { 0x0000, 0x0000, 0x0000, 0x1000 }},
+    { 1.0, { 0x0000, 0x7fff, 0x0000, 0x7fff }}
+  };
+  ArtVpath *vpath;
+  ArtSVP *svp;
+  ArtRender *render;
+
+  gradient.a = 0.003;
+  gradient.b = -0.0015;
+  gradient.c = 0.1;
+  gradient.spread = ART_GRADIENT_PAD;
+  gradient.n_stops = sizeof(stops) / sizeof(stops[0]);
+  gradient.stops = stops;
+
+  vpath = randstar (50);
+  svp = art_svp_from_vpath (vpath);
+
+  render = art_render_new (0, 0, 512, 512, buf, 512 * 3, 3, 8, ART_ALPHA_NONE,
+			   NULL);
+  art_render_svp (render, svp);
+  art_render_gradient_linear (render, &gradient, ART_FILTER_NEAREST);
+  art_render_invoke (render);
+
+}
+
+static void
+test_render_rad_gradient (art_u8 *buf)
+{
+  ArtGradientRadial gradient;
+  ArtGradientStop stops[3] = {
+    { 0.0, { 0xffff, 0x0000, 0x0000, 0xffff }},
+    { 0.5, { 0xe000, 0xe000, 0x0000, 0xe000 }},
+    { 1.0, { 0x0000, 0x0000, 0x0000, 0x0000 }}
+  };
+  ArtVpath *vpath;
+  ArtSVP *svp;
+  ArtRender *render;
+
+  gradient.affine[0] = 3.0 / 512;
+  gradient.affine[1] = 0;
+  gradient.affine[2] = 0;
+  gradient.affine[3] = 3.0 / 512;
+  gradient.affine[4] = -1.5;
+  gradient.affine[5] = -1.5;
+  gradient.fx = 0.9;
+  gradient.fy = 0.1;
+  
+  gradient.n_stops = sizeof(stops) / sizeof(stops[0]);
+  gradient.stops = stops;
+
+  vpath = randstar (50);
+  svp = art_svp_from_vpath (vpath);
+
+  render = art_render_new (0, 0, 512, 512, buf, 512 * 3, 3, 8, ART_ALPHA_NONE,
+			   NULL);
+  art_render_svp (render, svp);
+  art_render_gradient_radial (render, &gradient, ART_FILTER_NEAREST);
+  art_render_invoke (render);
+
+}
+
+static void
+test_gradient (void)
+{
+  ArtVpath *vpath;
+  ArtSVP *svp;
+  art_u8 buf[512 * 512 * 3];
+  ArtRender *render;
+  ArtPixMaxDepth color[3] = {0x0000, 0x0000, 0x8000 };
+  int i;
+  const int n_iter = 1;
+
+  vpath = randstar (50);
+  svp = art_svp_from_vpath (vpath);
+
+  for (i = 0; i < n_iter; i++)
+    {
+#define USE_RENDER
+#ifdef USE_RENDER
+      render = art_render_new (0, 0, 512, 512, buf, 512 * 3, 3, 8, ART_ALPHA_NONE,
+			       NULL);
+      art_render_clear_rgb (render, 0xfff0c0);
+      art_render_svp (render, svp);
+      art_render_image_solid (render, color);
+      art_render_invoke (render);
+#else
+      art_rgb_svp_aa (svp, 0, 0, 512, 512, 0xfff0c0, 0x000080,
+		      buf, 512 * 3, NULL);
+#endif
+    }
+
+#if 1
+  test_render_gradient (buf);
+#endif
+  test_render_rad_gradient (buf);
+
+  printf ("P6\n512 512\n255\n");
+  fwrite (buf, 1, 512 * 512 * 3, stdout);
+}
+
+#if 0
+static void
+output_svp_ppm (const ArtSVP *svp)
+{
+  art_u8 buf[512 * 512 * 3];
+  art_rgb_svp_aa (svp, 0, 0, 512, 512, 0xfff0c0, 0x000080,
+		  buf, 512 * 3, NULL);
+  printf ("P6\n512 512\n255\n");
+  fwrite (buf, 1, 512 * 512 * 3, stdout);
+}
+#endif
+
+static void
+test_intersect (void)
+{
+  ArtVpath vpath[] = {
+
+#if 0
+    /* two triangles */
+    { ART_MOVETO, 100, 100 },
+    { ART_LINETO, 300, 400 },
+    { ART_LINETO, 400, 200 },
+    { ART_LINETO, 100, 100 },
+    { ART_MOVETO, 110, 110 },
+    { ART_LINETO, 310, 410 },
+    { ART_LINETO, 410, 210 },
+    { ART_LINETO, 110, 110 },
+#endif
+
+#if 0
+    /* a bowtie */
+    { ART_MOVETO, 100, 100 },
+    { ART_LINETO, 400, 400 },
+    { ART_LINETO, 400, 100 },
+    { ART_LINETO, 100, 400 },
+    { ART_LINETO, 100, 100 },
+#endif
+
+#if 1
+    /* a square */
+    { ART_MOVETO, 100, 100 },
+    { ART_LINETO, 100, 400 },
+    { ART_LINETO, 400, 400 },
+    { ART_LINETO, 400, 100 },
+    { ART_LINETO, 100, 100 },
+#endif
+
+#if 1
+    /* another square */
+#define XOFF 10
+#define YOFF 10
+    { ART_MOVETO, 100 + XOFF, 100 + YOFF },
+    { ART_LINETO, 100 + XOFF, 400 + YOFF },
+    { ART_LINETO, 400 + XOFF, 400 + YOFF },
+    { ART_LINETO, 400 + XOFF, 100 + YOFF },
+    { ART_LINETO, 100 + XOFF, 100 + YOFF },
+#endif
+
+    { ART_END, 0, 0}
+  };
+  ArtSVP *svp, *svp2;
+  ArtSvpWriter *swr;
+
+  svp = art_svp_from_vpath (vpath);
+
+#define RUN_INTERSECT
+#ifdef RUN_INTERSECT
+  swr = art_svp_writer_rewind_new (ART_WIND_RULE_ODDEVEN);
+  art_svp_intersector (svp, swr);
+
+  svp2 = art_svp_writer_rewind_reap (swr);
+#endif
+
+#if 0
+  output_svp_ppm (svp2);
+#else
+  print_svp (svp2);
+#endif
+
+  art_svp_free (svp);
+
+#ifdef RUN_INTERSECT
+  art_svp_free (svp2);
+#endif
+}
+
+static void
+usage (void)
+{
+  fprintf (stderr, "usage: testart <test>\n"
+"  where <test> is one of:\n"
+"  testpat    -- make random star + gradients test pattern\n"
+"  gradient   -- test pattern for rendered gradients\n"
+"  dash       -- dash test (output is valid PostScript)\n"
+"  dist       -- distance test\n"
+"  intersect  -- softball test for intersector\n");
+  exit (1);
+}
+
+int
+main (int argc, char **argv)
+{
+  if (argc < 2)
+    usage ();
+
+  if (!strcmp (argv[1], "testpat"))
+    make_testpat ();
+  else if (!strcmp (argv[1], "gradient"))
+    test_gradient ();
+  else if (!strcmp (argv[1], "dist"))
+    test_dist ();
+  else if (!strcmp (argv[1], "dash"))
+    test_dash ();
+  else if (!strcmp (argv[1], "intersect"))
+    test_intersect ();
+  else
+    usage ();
+  return 0;
+}

testuta.c

@@ -0,0 +1,233 @@
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include "art_misc.h"
+#include "art_uta.h"
+#include "art_vpath.h"
+#include "art_uta_vpath.h"
+#include "art_rect.h"
+#include "art_rect_uta.h"
+#include "art_uta_rect.h"
+
+#undef LIBART_COMPILATION
+#include "libart-features.h"
+
+#define TEST_UTA
+#define noTEST_UTA_SPEED
+
+#define XOFF 50
+#define YOFF 700
+
+static void
+print_uta_ps (ArtUta *uta)
+{
+  int x, y;
+  int x0, y0, x1, y1;
+  int width = uta->width;
+  ArtUtaBbox ub;
+
+  for (y = 0; y < uta->height; y++)
+    for (x = 0; x < width; x++)
+      {
+	ub = uta->utiles[y * width + x];
+	if (ub != 0)
+	  {
+	    x0 = (uta->x0 + x) * ART_UTILE_SIZE + ART_UTA_BBOX_X0(ub);
+	    x1 = (uta->x0 + x) * ART_UTILE_SIZE + ART_UTA_BBOX_X1(ub);
+	    y0 = (uta->y0 + y) * ART_UTILE_SIZE + ART_UTA_BBOX_Y0(ub);
+	    y1 = (uta->y0 + y) * ART_UTILE_SIZE + ART_UTA_BBOX_Y1(ub);
+	    printf ("%% tile %d, %d: %d %d %d %d\n",
+		    x, y,
+		    ART_UTA_BBOX_X0(ub),
+		    ART_UTA_BBOX_Y0(ub),
+		    ART_UTA_BBOX_X1(ub),
+		    ART_UTA_BBOX_Y1(ub));
+	    printf ("%d %d moveto %d %d lineto %d %d lineto %d %d lineto closepath fill\n",
+		    XOFF + x0, YOFF - y0, XOFF + x1, YOFF - y0,
+		    XOFF + x1, YOFF - y1, XOFF + x0, YOFF - y1);
+	  }
+      }
+}
+
+static void
+print_rbuf_ps (int *rbuf, int width, int height)
+{
+  int x, y;
+
+  for (y = 0; y < height; y++)
+    for (x = 0; x < width; x++)
+      if (1 && rbuf[y * width + x] != 0)
+	printf ("%d %d moveto (%d) show\n", x * ART_UTILE_SIZE, y * ART_UTILE_SIZE,
+		rbuf[y * width + x]);	
+}
+
+#if 0
+void
+randline (ArtUta *uta, int *rbuf, int rbuf_rowstride)
+{
+  double x0, y0, x1, y1;
+
+  x0 = rand () * (500.0 / RAND_MAX);
+  y0 = rand () * (500.0 / RAND_MAX);
+  x1 = rand () * (500.0 / RAND_MAX);
+  y1 = rand () * (500.0 / RAND_MAX);
+
+  printf ("%g %g moveto %g %g lineto stroke\n", x0, y0, x1, y1);
+  art_uta_add_line (uta, x0, y0, x1, y1, rbuf, rbuf_rowstride);
+}
+#endif
+
+static void
+print_ps_vpath (ArtVpath *vpath)
+{
+  int i;
+
+  for (i = 0; vpath[i].code != ART_END; i++)
+    {
+      switch (vpath[i].code)
+	{
+	case ART_MOVETO:
+	  printf ("%g %g moveto\n", XOFF + vpath[i].x, YOFF - vpath[i].y);
+	  break;
+	case ART_LINETO:
+	  printf ("%g %g lineto\n", XOFF + vpath[i].x, YOFF - vpath[i].y);
+	  break;
+	default:
+	  break;
+	}
+    }
+  printf ("stroke\n");
+}
+
+static ArtVpath *
+randstar (int n)
+{
+  ArtVpath *vec;
+  int i;
+  double r, th;
+
+  vec = art_new (ArtVpath, n + 2);
+  for (i = 0; i < n; i++)
+    {
+      vec[i].code = i ? ART_LINETO : ART_MOVETO;
+      r = rand () * (250.0 / RAND_MAX);
+      th = i * 2 * M_PI / n;
+      vec[i].x = 250 + r * cos (th);
+      vec[i].y = 250 - r * sin (th);
+    }
+  vec[i].code = ART_LINETO;
+  vec[i].x = vec[0].x;
+  vec[i].y = vec[0].y;
+  i++;
+  vec[i].code = ART_END;
+  vec[i].x = 0;
+  vec[i].y = 0;
+  return vec;
+}
+
+int
+main (int argc, char **argv)
+{
+  ArtUta *uta;
+  int i;
+  int *rbuf;
+  ArtVpath *vec;
+  ArtIRect *rects;
+  int n_rects;
+
+  if (argc == 2)
+    srand (atoi (argv[1]));
+
+#ifdef TEST_UTA
+  printf ("%%!PS-Adobe\n");
+  printf ("%% libart version: %d.%d.%d\n",
+	  libart_major_version, libart_minor_version, libart_micro_version);
+  printf ("/Helvetica findfont 12 scalefont setfont\n");
+  printf ("0.5 setlinewidth\n");
+
+  printf ("0.5 setgray\n");
+  for (i = 0; i < 500; i += ART_UTILE_SIZE)
+    {
+      printf ("%d %d moveto %d %d lineto stroke\n",
+	      XOFF, YOFF - i, XOFF + 500, YOFF - i);
+      printf ("%d %d moveto %d %d lineto stroke\n",
+	      XOFF + i, YOFF, XOFF + i, YOFF - 500);
+    }
+
+  printf ("/a {\n");
+
+#if 1
+  vec = randstar (50);
+  print_ps_vpath (vec);
+  uta = art_uta_from_vpath (vec);
+#ifdef TEST_UTA_RECT
+  {
+    ArtIRect bbox = {5, 5, 450, 450};
+    uta = art_uta_from_irect (&bbox);
+  }
+#endif
+  rbuf = NULL;
+#else
+  uta = art_uta_new_coords (0, 0, 500, 500);
+
+  rbuf = malloc (sizeof(int) * (500 >> ART_UTILE_SHIFT) * (500 >> ART_UTILE_SHIFT));
+  for (i = 0; i < 10; i++)
+    randline (uta, rbuf, 500 >> ART_UTILE_SHIFT);
+#endif
+
+  printf ("} def 1 0.5 0.5 setrgbcolor\n");
+
+  print_uta_ps (uta);
+
+  printf ("0 0 0.5 setrgbcolor\n");
+
+  if (rbuf)
+    print_rbuf_ps (rbuf, 500 >> ART_UTILE_SHIFT, 500 >> ART_UTILE_SHIFT);
+
+  printf ("0 setgray a\n");
+
+  rects = art_rect_list_from_uta (uta, 256, 64, &n_rects);
+
+  printf ("%% %d rectangles:\n0 0 1 setrgbcolor\n", n_rects);
+
+  for (i = 0; i < n_rects; i++)
+    printf ("%d %d moveto %d %d lineto %d %d lineto %d %d lineto closepath stroke\n",
+	    XOFF + rects[i].x0, YOFF - rects[i].y0,
+	    XOFF + rects[i].x1, YOFF - rects[i].y0,
+	    XOFF + rects[i].x1, YOFF - rects[i].y1,
+	    XOFF + rects[i].x0, YOFF - rects[i].y1);
+
+  printf ("showpage\n");
+#endif
+
+#ifdef TEST_UTA_SPEED
+  for (i = 0; i < 1000; i++)
+    {
+      vec = randstar (50);
+      uta = art_uta_from_vpath (vec);
+      art_free (vec);
+      art_uta_free (uta);
+    }
+#endif
+
+  return 0;
+}