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532 lines
22 KiB
532 lines
22 KiB
15 years ago
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//C- -*- C++ -*-
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//C- -------------------------------------------------------------------
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//C- DjVuLibre-3.5
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//C- Copyright (c) 2002 Leon Bottou and Yann Le Cun.
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//C- Copyright (c) 2001 AT&T
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//C-
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//C- This software is subject to, and may be distributed under, the
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//C- GNU General Public License, Version 2. The license should have
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//C- accompanied the software or you may obtain a copy of the license
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//C- from the Free Software Foundation at http://www.fsf.org .
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//C-
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//C- This program is distributed in the hope that it will be useful,
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//C- but WITHOUT ANY WARRANTY; without even the implied warranty of
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//C- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//C- GNU General Public License for more details.
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//C-
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//C- DjVuLibre-3.5 is derived from the DjVu(r) Reference Library
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//C- distributed by Lizardtech Software. On July 19th 2002, Lizardtech
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//C- Software authorized us to replace the original DjVu(r) Reference
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//C- Library notice by the following text (see doc/lizard2002.djvu):
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//C-
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//C- ------------------------------------------------------------------
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//C- | DjVu (r) Reference Library (v. 3.5)
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//C- | Copyright (c) 1999-2001 LizardTech, Inc. All Rights Reserved.
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//C- | The DjVu Reference Library is protected by U.S. Pat. No.
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//C- | 6,058,214 and patents pending.
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//C- |
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//C- | This software is subject to, and may be distributed under, the
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//C- | GNU General Public License, Version 2. The license should have
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//C- | accompanied the software or you may obtain a copy of the license
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//C- | from the Free Software Foundation at http://www.fsf.org .
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//C- |
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//C- | The computer code originally released by LizardTech under this
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//C- | license and unmodified by other parties is deemed "the LIZARDTECH
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//C- | ORIGINAL CODE." Subject to any third party intellectual property
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//C- | claims, LizardTech grants recipient a worldwide, royalty-free,
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//C- | non-exclusive license to make, use, sell, or otherwise dispose of
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//C- | the LIZARDTECH ORIGINAL CODE or of programs derived from the
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//C- | LIZARDTECH ORIGINAL CODE in compliance with the terms of the GNU
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//C- | General Public License. This grant only confers the right to
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//C- | infringe patent claims underlying the LIZARDTECH ORIGINAL CODE to
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//C- | the extent such infringement is reasonably necessary to enable
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//C- | recipient to make, have made, practice, sell, or otherwise dispose
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//C- | of the LIZARDTECH ORIGINAL CODE (or portions thereof) and not to
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//C- | any greater extent that may be necessary to utilize further
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//C- | modifications or combinations.
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//C- |
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//C- | The LIZARDTECH ORIGINAL CODE is provided "AS IS" WITHOUT WARRANTY
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//C- | OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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//C- | TO ANY WARRANTY OF NON-INFRINGEMENT, OR ANY IMPLIED WARRANTY OF
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//C- | MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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//C- +------------------------------------------------------------------
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//
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// $Id: GPixmap.h,v 1.8 2003/11/07 22:08:21 leonb Exp $
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// $Name: release_3_5_15 $
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#ifndef _GPIXMAP_H_
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#define _GPIXMAP_H_
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#if NEED_GNUG_PRAGMAS
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# pragma interface
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#endif
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/** @name GPixmap.h
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Files #"GPixmap.h"# and #"GPixmap.cpp"# implement class \Ref{GPixmap}.
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Instances of this class represent color images. Each RGB pixel is
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represented by structure \Ref{GPixel}. The ``bottom left'' coordinate system
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is used consistently in the DjVu library. Line zero of a GPixmap is the
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bottom line in the color image. Pixels are organized from left to right
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within each line.
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{\bf ToDo} --- More sophisticated color correction schemes.
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@memo
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Generic support for color images.
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@author
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L\'eon Bottou <leonb@research.att.com>
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@version
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#$Id: GPixmap.h,v 1.8 2003/11/07 22:08:21 leonb Exp $# */
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//@{
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#include "GSmartPointer.h"
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#ifdef HAVE_NAMESPACES
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namespace DJVU {
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# ifdef NOT_DEFINED // Just to fool emacs c++ mode
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}
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#endif
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#endif
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class GBitmap;
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class GRect;
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class ByteStream;
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/** Color pixel as a RGB triple.
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The colors are represented using three bytes named #r#, #g# and #b#. The
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value of these bytes represent additive amounts of light. Color white is
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represented by setting all three bytes to #255#. Color black is
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represented by setting all three bytes to #0#. This convention should not
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be confused with the convention adopted for class \Ref{GBitmap} where the
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pixel values represent an ink level. */
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struct GPixel
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{
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/** Blue component. */
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unsigned char b;
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/** Green component. */
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unsigned char g;
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/** Red component. */
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unsigned char r;
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/** Returns true iff colors are identical. */
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friend int operator==(const GPixel & p1, const GPixel & p2);
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/** Returns true iff colors are different. */
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friend int operator!=(const GPixel & p1, const GPixel & p2);
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/** Returns a hash code for the color. */
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friend unsigned int hash(const GPixel &p);
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/** @name Predefined colors. */
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//@{
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/// GPixel::WHITE is initialized to #rgb:255/255/255#.
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static const GPixel WHITE;
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/// GPixel::BLACK is initialized to #rgb:0/0/0#.
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static const GPixel BLACK;
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/// GPixel::BLUE is initialized to #rgb:0/0/255#.
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static const GPixel BLUE;
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/// GPixel::GREEN is initialized to #rgb:0/255/0#.
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static const GPixel GREEN;
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/// GPixel::RED is initialized to #rgb:255/0/0#.
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static const GPixel RED;
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//@}
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};
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/** RGB Color images.
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Instances of class #GPixmap# represent color images as a two dimensional
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array of pixels \Ref{GPixel}. The bracket operator returns a pointer to
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the pixels composing one line of the image. This pointer can be used as
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an array to read or write the pixels of this particular line. Following
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the general convention of the DjVu Reference Library, line zero is always
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the bottom line of the image.
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*/
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class GPixmap : public GPEnabled
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{
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protected:
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GPixmap(void);
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GPixmap(int nrows, int ncolumns, const GPixel *filler=0);
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GPixmap(const GBitmap &ref);
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GPixmap(const GBitmap &ref, const GRect &rect);
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GPixmap(const GPixmap &ref);
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GPixmap(const GPixmap &ref, const GRect &rect);
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GPixmap(ByteStream &ref);
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public:
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/// Virtual destructor.
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virtual ~GPixmap();
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void destroy(void);
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/** @name Construction. */
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//@{
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/** Creates an empty GBitmap object. The returned GPixmap has zero rows
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and zero columns. Use function \Ref{init} to change the size of the
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image. */
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static GP<GPixmap> create(void) {return new GPixmap();}
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/** Creates a GPixmap with #nrows# rows and #ncolumns# columns. When the
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optional argument #filler# is specified, all pixels are initialized
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with the corresponding color. */
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static GP<GPixmap> create(
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const int nrows, const int ncolumns, const GPixel *filler=0)
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{ return new GPixmap(nrows,ncolumns,filler); }
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/** Creates a GPixmap by copying the gray level image #ref#.
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The constructed GPixmap has the same size as #ref#. The pixels
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are initialized with shades of grays copied from #ref#. */
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static GP<GPixmap> create(const GBitmap &ref)
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{ return new GPixmap(ref); }
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/** Creates a GPixmap by copying the rectangle #rect# of the gray level
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image #ref#. The constructed GPixmap has the same size as rectangle
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#rect#. The pixels are initialized with shades of grays converted from
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the ink levels represented in #ref#. This conversion depends on the
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number of gray levels in #ref#. */
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static GP<GPixmap> create(const GBitmap &ref, const GRect &rect)
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{ return new GPixmap(ref,rect); }
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/** Copy constructors. Creates a GPixmap by replicating the size and the
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contents of GPixmap #ref#. */
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static GP<GPixmap> create(const GPixmap &ref)
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{ return new GPixmap(ref); }
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/** Creates a GPixmap by copying the rectangle #rect# of the color image #ref#.
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The constructed GPixmap has the same size as rectangle #rect#.
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The pixels are initialized with colors copied from #ref#. */
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static GP<GPixmap> create(const GPixmap &ref, const GRect &rect)
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{ return new GPixmap(ref,rect); }
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/** Creates a GPixmap by reading PPM data from ByteStream #ref#.
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See \Ref{PNM and RLE file formats} for more information. */
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static GP<GPixmap> create(ByteStream &ref)
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{ return new GPixmap(ref); }
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//@}
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/** @name Initialization. */
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//@{
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/** Resets the GPixmap to #nrows# rows and #ncolumns# columns. When the
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optional argument #filler# is specified, all pixels are initialized with
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the corresponding color. The previous content of the GPixmap is discarded. */
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void init(int nrows, int ncolumns, const GPixel *filler=0);
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/** Resets the GPixmap by copying the size and the contents of the color
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image #ref#. The previous content of the GPixmap is discarded. */
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void init(const GPixmap &ref);
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/** Resets the GPixmap by copying the rectangle #rect# of the color image #ref#.
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The previous content of the GPixmap is discarded. */
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void init(const GPixmap &ref, const GRect &rect);
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/** Resets the GPixmap by copying the size and the contents of the gray
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level image #ref#. The optional argument #ramp# is an array of 256
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pixel values used for mapping the gray levels to color values.
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Setting #ramp# to zero selects a linear ramp of shades of gray. */
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void init(const GBitmap &ref, const GPixel *ramp=0);
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/** Resets the GPixmap by copying the rectangle #rect# of the gray level
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image #ref#. The optional argument #ramp# is an array of 256 pixel
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values used for mapping the gray levels to color values. Setting #ramp#
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to zero selects a linear ramp computed according to the maximal number
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of gray levels in #ref#. */
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void init(const GBitmap &ref, const GRect &rect, const GPixel *ramp=0);
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/** Resets the GPixmap by reading PPM data from ByteStream #ref#. See
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\Ref{PNM and RLE file formats} for more information. */
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void init(ByteStream &ref);
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/** Resets the GPixmap by copying the gray level image #ref#. The pixels
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are initialized with shades of grays copied from #ref#. */
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GPixmap& operator=(const GBitmap &ref);
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/** Copy operator. Resets the GPixmap by copying the size and the contents
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of the color image #ref#. The previous content of the GPixmap is
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discarded. */
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GPixmap& operator=(const GPixmap &ref);
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//@}
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/** @name Accessing pixels. */
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//@{
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/** Returns the number of rows (the image height). */
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unsigned int rows() const;
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/** Returns the number of columns (the image width). */
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unsigned int columns() const;
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/** Returns a constant pointer to the first GPixel in row #row#. This
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pointer can be used as an array to read the row elements. */
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const GPixel * operator[] (int row) const;
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/** Returns a pointer to the first GPixel in row #row#. This pointer can be
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used as an array to read or write the row elements. */
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GPixel * operator[] (int row);
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/** Returns the length (in pixels) of a row in memory. This number is equal
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to the difference between pointers to pixels located in the same column
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in consecutive rows. This difference may be larger than the number of
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columns in the image. */
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unsigned int rowsize() const;
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//@}
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/** @name Resampling images. */
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//@{
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/** Resets this GPixmap with a subsampled segment of color image #src#.
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This function conceptually rescales image #src# by a factor #1:factor#,
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and copies rectangle #rect# of the subsampled image into the current GPixmap.
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The full subsampled image is copied if #rect# is a null pointer.
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Both operations are however performed together for efficiency reasons.
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Subsampling works by averaging the colors of the source pixels located
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in small squares of size #factor# times #factor#. */
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void downsample(const GPixmap *src, int factor, const GRect *rect=0);
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/** Resets this GPixmap with a oversampled segment of color image #src#.
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This function conceptually rescales image #src# by a factor #factor:1#,
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and copies rectangle #rect# of the oversampled image into the current
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GPixmap. The full oversampled image is copied if #rect# is a null
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pointer. Both operations are however performed together for efficiency
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reasons. Oversampling works by replicating the color of the source
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pixels into squares of size #factor# times #factor#. */
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void upsample(const GPixmap *src, int factor, const GRect *rect=0);
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/** Resets this GPixmap with a rescaled segment of #src# (zoom 75%). This
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function conceptually rescales image #src# by a factor #3:4#, and copies
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rectangle #rect# of the rescaled image into the current GPixmap. The
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full rescaled image is copied if #rect# is a null pointer. Both
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operations are however performed together for efficiency reasons. This
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function has been superseded by class \Ref{GPixmapScaler}. */
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void downsample43(const GPixmap *src, const GRect *rect=0);
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/** Resets this GPixmap with a rescaled segment of #src# (zoom 150%). This
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function conceptually rescales image #src# by a factor #3:2# and copies
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rectangle #rect# of the rescaled image into the current GPixmap. The
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full rescaled image is copied if #rect# is a null pointer. Both
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operations are however performed together for efficiency reasons. This
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function has been superseded by class \Ref{GPixmapScaler}. */
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void upsample23(const GPixmap *src, const GRect *rect=0);
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//@}
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/** @name Blitting and applying stencils.
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These function is essential for rendering DjVu images. The elementary
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functions are \Ref{attenuate} and \Ref{blit}. The combined functions
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\Ref{blend} and \Ref{stencil} should be viewed as optimizations. */
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//@{
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/** Attenuates the color image in preparation for a blit.
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Bitmap #bm# is positionned at location #x#,#y# over this color image.
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The matching color image pixels are then multiplied by #1.0-Alpha# where
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#Alpha# denotes the gray value, in range #[0,1]#, represented by the
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corresponding pixel of bitmap #bm#. */
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void attenuate(const GBitmap *bm, int x, int y);
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/** Blits solid color #color# through transparency mask #bm#.
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Bitmap #bm# is positionned at location #x#,#y# over this color image.
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The matching color image pixels are then modified by adding color
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#color# multiplied by #Alpha#, where #Alpha# denotes the gray value, in
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range #[0,1]#, represented by the corresponding pixel of bitmap #bm#. */
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void blit(const GBitmap *bm, int x, int y, const GPixel *color);
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/** Blits pixmap #color# through transparency mask #bm#.
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Bitmap #bm# is positionned at location #x#,#y# over this color image.
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The matching color image pixels are then modified by adding the
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corresponding pixel color in pixmap #color#, multiplied by #Alpha#,
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where #Alpha# denotes the gray value, in range #[0,1]#, represented by
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the corresponding pixel of bitmap #bm#. */
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void blit(const GBitmap *bm, int x, int y, const GPixmap *color);
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/** Performs alpha blending. This function is similar to first calling
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\Ref{attenuate} with alpha map #bm# and then calling \Ref{blit} with
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alpha map #bm# and color map #color#. Both operations are performed
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together for efficiency reasons. */
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void blend(const GBitmap *bm, int x, int y, const GPixmap *color);
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/** Resample color pixmap and performs color corrected alpha blending. This
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function conceptually computes an intermediate color image by first
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upsampling the GPixmap #pm# by a factor #pms:1# (see \Ref{upsample}),
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extracting the sub-image designated by rectangle #pmr# and applying
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color correction #corr# (see \Ref{color_correct}). This intermediate
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color image is then blended into this pixel map according to the alpha
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map #bm# (see \Ref{blend}). */
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void stencil(const GBitmap *bm,
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const GPixmap *pm, int pms,
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const GRect *pmr, double corr=1.0);
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//@}
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/** @name Manipulating colors. */
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//@{
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/** Dithers the image to 216 colors. This function applies an ordered
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dithering algorithm to reduce the image to 216 predefined colors. These
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predefined colors are located on a color cube of 6x6x6 colors: the color
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RGB coordinates can only take the following values: #0#, #51#, #102#,
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#163#, #214# or #255#. This is useful for displaying images on a device
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supporting a maximum of 256 colors. Arguments #xmin# and #ymin# control
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the position of the dithering grids. This is useful for dithering tiled
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images. Arguments #xmin# and #ymin# must be the position of the bottom
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left corner of the tile contained in this GPixmap. Properly setting
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these arguments eliminates dithering artifacts on the tile
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boundaries. */
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void ordered_666_dither(int xmin=0, int ymin=0);
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/** Dithers the image to 32768 colors. This function applies an ordered
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dithering algorithm to reduce the image to 32768 predefined colors.
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These predefined colors are located on a color cube of 32x32x32 colors:
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the color RGB coordinates can only take values in which the three least
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significant bits are set to #1#. This is useful for displaying images
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with less than 24 bits per pixel. Arguments #xmin# and #ymin# control
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the position of the dithering grids. This is useful for dithering tiled
|
||
|
images. Arguments #xmin# and #ymin# must be the position of the bottom
|
||
|
left corner of the tile contained in this GPixmap. Properly setting
|
||
|
these arguments eliminates dithering artifacts on the tile
|
||
|
boundaries. */
|
||
|
void ordered_32k_dither(int xmin=0, int ymin=0);
|
||
|
/** Applies a luminance gamma correction factor of #corr#. Values greater than
|
||
|
#1.0# make the image brighter. Values smaller than #1.0# make the image
|
||
|
darker. The documentation of program \Ref{ppmcoco} explains how to
|
||
|
properly use this function. */
|
||
|
void color_correct(double corr);
|
||
|
/** Applies a luminance gamma correction to an array of pixels.
|
||
|
This function is {\em static} and does not modify this pixmap. */
|
||
|
static void color_correct(double corr, GPixel *pixels, int npixels);
|
||
|
|
||
|
//@}
|
||
|
|
||
|
/** @name Miscellaneous. */
|
||
|
//@{
|
||
|
/** Returns the number of bytes allocated for this image. */
|
||
|
inline unsigned int get_memory_usage() const;
|
||
|
/** Saves the image into ByteStream #bs# using the PPM format.
|
||
|
Argument #raw# selects the ``Raw PPM'' (1) or the ``Ascii PPM'' (0) format.
|
||
|
See \Ref{PNM and RLE file formats} for more information. */
|
||
|
void save_ppm(ByteStream &bs, int raw=1) const;
|
||
|
//@}
|
||
|
|
||
|
/** @name Stealing or borrowing the memory buffer (advanced). */
|
||
|
//@{
|
||
|
/** Steals the memory buffer of a GPixmap. This function returns the
|
||
|
address of the memory buffer allocated by this GPixmap object. The
|
||
|
offset of the first pixel in the bottom line is written into variable
|
||
|
#offset#. Other lines can be accessed using pointer arithmetic (see
|
||
|
\Ref{rowsize}). The GPixmap object no longer ``owns'' the buffer: you
|
||
|
must explicitly de-allocate the buffer using #operator delete []#. This
|
||
|
de-allocation should take place after the destruction or the
|
||
|
re-initialization of the GPixmap object. This function will return a
|
||
|
null pointer if the GPixmap object does not ``own'' the buffer in the
|
||
|
first place. */
|
||
|
GPixel *take_data(size_t &offset);
|
||
|
/** Initializes this GPixmap by borrowing a memory segment. The GPixmap
|
||
|
then directly addresses the memory buffer #data# provided by the user.
|
||
|
This buffer must be large enough to hold #w*h# GPixels. The GPixmap
|
||
|
object does not ``own'' the buffer: you must explicitly de-allocate the
|
||
|
buffer using #operator delete []#. This de-allocation should take place
|
||
|
after the destruction or the re-initialization of the GPixmap object. */
|
||
|
inline void borrow_data(GPixel &data, int w, int h);
|
||
|
/// Identical to the above, but GPixmap will do the delete [].
|
||
|
void donate_data(GPixel *data, int w, int h);
|
||
|
|
||
|
/** Rotates pixmap by 90, 180 or 270 degrees anticlockwise
|
||
|
and returns a new pixmap, input pixmap is not changed.
|
||
|
count can be 1, 2, or 3 for 90, 180, 270 degree rotation.
|
||
|
It returns the same pixmap if not rotated. */
|
||
|
GP<GPixmap> rotate(int count=0);
|
||
|
|
||
|
//@}
|
||
|
|
||
|
// Please ignore these two functions. Their only purpose is to allow
|
||
|
// DjVu viewer compile w/o errors. eaf.
|
||
|
// Is this still useful ?. lyb.
|
||
|
int get_grays(void) const { return 256; };
|
||
|
void set_grays(int) {};\
|
||
|
|
||
|
protected:
|
||
|
// data
|
||
|
unsigned short nrows;
|
||
|
unsigned short ncolumns;
|
||
|
unsigned short nrowsize;
|
||
|
GPixel *pixels;
|
||
|
GPixel *pixels_data;
|
||
|
friend class DjVu_PixImage;
|
||
|
};
|
||
|
|
||
|
//@}
|
||
|
|
||
|
// INLINE --------------------------
|
||
|
|
||
|
|
||
|
inline int
|
||
|
operator==(const GPixel & p1, const GPixel & p2)
|
||
|
{
|
||
|
return p1.r==p2.r && p1.g==p2.g && p1.b==p2.b;
|
||
|
}
|
||
|
|
||
|
inline int
|
||
|
operator!=(const GPixel & p1, const GPixel & p2)
|
||
|
{
|
||
|
return p1.r!=p2.r || p1.g!=p2.g || p1.b!=p2.b;
|
||
|
}
|
||
|
|
||
|
inline unsigned int
|
||
|
hash(const GPixel &p)
|
||
|
{
|
||
|
unsigned int x = (p.b<<16)|(p.g<<8)|(p.r);
|
||
|
return x ^ (p.b<<4) ^ (p.r<<12);
|
||
|
}
|
||
|
|
||
|
inline unsigned int
|
||
|
GPixmap::rows() const
|
||
|
{
|
||
|
return nrows;
|
||
|
}
|
||
|
|
||
|
inline unsigned int
|
||
|
GPixmap::columns() const
|
||
|
{
|
||
|
return ncolumns;
|
||
|
}
|
||
|
|
||
|
inline unsigned int
|
||
|
GPixmap::rowsize() const
|
||
|
{
|
||
|
return nrowsize;
|
||
|
}
|
||
|
|
||
|
inline GPixel *
|
||
|
GPixmap::operator[](int row)
|
||
|
{
|
||
|
if (row<0 || row>=nrows || !pixels) return 0;
|
||
|
return &pixels[row * nrowsize];
|
||
|
}
|
||
|
|
||
|
inline const GPixel *
|
||
|
GPixmap::operator[](int row) const
|
||
|
{
|
||
|
if (row<0 || row>=nrows) return 0;
|
||
|
return &pixels[row * nrowsize];
|
||
|
}
|
||
|
|
||
|
inline GPixmap &
|
||
|
GPixmap::operator=(const GBitmap &ref)
|
||
|
{
|
||
|
init(ref);
|
||
|
return *this;
|
||
|
}
|
||
|
|
||
|
inline GPixmap &
|
||
|
GPixmap::operator=(const GPixmap &ref)
|
||
|
{
|
||
|
init(ref);
|
||
|
return *this;
|
||
|
}
|
||
|
|
||
|
inline void
|
||
|
GPixmap::borrow_data(GPixel &data, int w, int h)
|
||
|
{
|
||
|
donate_data(&data,w,h);
|
||
|
pixels_data=0;
|
||
|
}
|
||
|
|
||
|
//////////////////////////////////////////////////
|
||
|
// Memory usage
|
||
|
//////////////////////////////////////////////////
|
||
|
|
||
|
|
||
|
inline unsigned int
|
||
|
GPixmap::get_memory_usage() const
|
||
|
{
|
||
|
return sizeof(GPixmap)+(nrows * ncolumns * sizeof(GPixel));
|
||
|
}
|
||
|
|
||
|
// ---------------------------------
|
||
|
|
||
|
#ifdef HAVE_NAMESPACES
|
||
|
}
|
||
|
# ifndef NOT_USING_DJVU_NAMESPACE
|
||
|
using namespace DJVU;
|
||
|
# endif
|
||
|
#endif
|
||
|
#endif
|
||
|
|
||
|
|