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koffice/chalk/core/kis_painter.cc

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/*
* Copyright (c) 2002 Patrick Julien <freak@codepimps.org>
* Copyright (c) 2004 Boudewijn Rempt <boud@valdyas.org>
* Copyright (c) 2004 Clarence Dang <dang@kde.org>
* Copyright (c) 2004 Adrian Page <adrian@pagenet.plus.com>
* Copyright (c) 2004 Cyrille Berger <cberger@cberger.net>
*
* 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 of the License, 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <stdlib.h>
#include <string.h>
#include <cfloat>
#include <cmath>
#include <climits>
#include <strings.h>
#include "tqbrush.h"
#include "tqfontinfo.h"
#include "tqfontmetrics.h"
#include "tqpen.h"
#include "tqregion.h"
#include "tqwmatrix.h"
#include <tqimage.h>
#include <tqmap.h>
#include <tqpainter.h>
#include <tqpixmap.h>
#include <tqpointarray.h>
#include <tqrect.h>
#include <tqstring.h>
#include <kdebug.h>
#include <kcommand.h>
#include <klocale.h>
#include "kis_brush.h"
#include "kis_debug_areas.h"
#include "kis_image.h"
#include "kis_layer.h"
#include "kis_paint_device.h"
#include "kis_painter.h"
#include "kis_pattern.h"
#include "kis_rect.h"
#include "kis_colorspace.h"
#include "kis_transaction.h"
#include "kis_types.h"
#include "kis_vec.h"
#include "kis_iterators_pixel.h"
#include "kis_paintop.h"
#include "kis_selection.h"
#include "kis_fill_painter.h"
#include "kis_color.h"
// Maximum distance from a Bezier control point to the line through the start
// and end points for the curve to be considered flat.
#define BEZIER_FLATNESS_THRESHOLD 0.5
KisPainter::KisPainter()
{
init();
}
KisPainter::KisPainter(KisPaintDeviceSP device)
{
init();
Q_ASSERT(device);
begin(device);
}
void KisPainter::init()
{
m_transaction = 0;
m_paintOp = 0;
m_filter = 0;
m_brush = 0;
m_pattern= 0;
m_opacity = OPACITY_OPAQUE;
m_compositeOp = COMPOSITE_OVER;
m_dab = 0;
m_fillStyle = FillStyleNone;
m_strokeStyle = StrokeStyleBrush;
m_pressure = PRESSURE_MIN;
m_duplicateHealing = false;
m_duplicateHealingRadius = 10;
m_duplicatePerspectiveCorrection = false;
m_varyBrushSpacingWithPressureWhenDrawingALine = true;
}
KisPainter::~KisPainter()
{
m_brush = 0;
delete m_paintOp;
end();
}
void KisPainter::begin(KisPaintDeviceSP device)
{
if (!device) return;
if (m_transaction)
delete m_transaction;
m_device = device;
m_colorSpace = device->colorSpace();
m_pixelSize = device->pixelSize();
}
KCommand *KisPainter::end()
{
return endTransaction();
}
void KisPainter::beginTransaction(const TQString& customName)
{
if (m_transaction)
delete m_transaction;
m_transaction = new KisTransaction(customName, m_device);
TQ_CHECK_PTR(m_transaction);
}
void KisPainter::beginTransaction( KisTransaction* command)
{
if (m_transaction)
delete m_transaction;
m_transaction = command;
}
KCommand *KisPainter::endTransaction()
{
KCommand *command = m_transaction;
m_transaction = 0;
return command;
}
TQRect KisPainter::dirtyRect() {
TQRect r = m_dirtyRect;
m_dirtyRect = TQRect();
return r;
}
void KisPainter::bitBlt(TQ_INT32 dx, TQ_INT32 dy,
const KisCompositeOp& op,
KisPaintDeviceSP srcdev,
TQ_UINT8 opacity,
TQ_INT32 sx, TQ_INT32 sy,
TQ_INT32 sw, TQ_INT32 sh)
{
if (srcdev == 0) {
return;
}
TQRect srcRect = TQRect(sx, sy, sw, sh);
if (srcdev->extentIsValid() && op != COMPOSITE_COPY) {
srcRect &= srcdev->extent();
}
if (srcRect.isEmpty()) {
return;
}
dx += srcRect.x() - sx;
dy += srcRect.y() - sy;
sx = srcRect.x();
sy = srcRect.y();
sw = srcRect.width();
sh = srcRect.height();
addDirtyRect(TQRect(dx, dy, sw, sh));
KisColorSpace * srcCs = srcdev->colorSpace();
TQ_INT32 dstY = dy;
TQ_INT32 srcY = sy;
TQ_INT32 rowsRemaining = sh;
while (rowsRemaining > 0) {
TQ_INT32 dstX = dx;
TQ_INT32 srcX = sx;
TQ_INT32 columnsRemaining = sw;
TQ_INT32 numContiguousDstRows = m_device->numContiguousRows(dstY, dstX, dstX + sw - 1);
TQ_INT32 numContiguousSrcRows = srcdev->numContiguousRows(srcY, srcX, srcX + sw - 1);
TQ_INT32 rows = TQMIN(numContiguousDstRows, numContiguousSrcRows);
rows = TQMIN(rows, rowsRemaining);
while (columnsRemaining > 0) {
TQ_INT32 numContiguousDstColumns = m_device->numContiguousColumns(dstX, dstY, dstY + rows - 1);
TQ_INT32 numContiguousSrcColumns = srcdev->numContiguousColumns(srcX, srcY, srcY + rows - 1);
TQ_INT32 columns = TQMIN(numContiguousDstColumns, numContiguousSrcColumns);
columns = TQMIN(columns, columnsRemaining);
TQ_INT32 srcRowStride = srcdev->rowStride(srcX, srcY);
//const TQ_UINT8 *srcData = srcdev->pixel(srcX, srcY);
KisHLineIteratorPixel srcIt = srcdev->createHLineIterator(srcX, srcY, columns, false);
const TQ_UINT8 *srcData = srcIt.rawData();
//TQ_UINT8 *dstData = m_device->writablePixel(dstX, dstY);
TQ_INT32 dstRowStride = m_device->rowStride(dstX, dstY);
KisHLineIteratorPixel dstIt = m_device->createHLineIterator(dstX, dstY, columns, true);
TQ_UINT8 *dstData = dstIt.rawData();
m_colorSpace->bitBlt(dstData,
dstRowStride,
srcCs,
srcData,
srcRowStride,
0,
0,
opacity,
rows,
columns,
op);
srcX += columns;
dstX += columns;
columnsRemaining -= columns;
}
srcY += rows;
dstY += rows;
rowsRemaining -= rows;
}
}
void KisPainter::bltSelection(TQ_INT32 dx, TQ_INT32 dy,
const KisCompositeOp &op,
KisPaintDeviceSP srcdev,
KisSelectionSP seldev,
TQ_UINT8 opacity,
TQ_INT32 sx, TQ_INT32 sy,
TQ_INT32 sw, TQ_INT32 sh)
{
// Better use a probablistic method than a too slow one
if (seldev->isProbablyTotallyUnselected(TQRect(dx, dy, sw, sh))) {
/*
kdDebug() << "Blitting outside selection rect\n";
kdDebug() << "srcdev: " << srcdev << " (" << srcdev->name() << ")"
<< ", seldev: " << seldev << " (" << seldev->name() << ")"
<< ". dx, dy " << dx << "," << dy
<< ". sx, sy : sw, sy " << sx << "," << sy << " : " << sw << "," << sh << endl;
*/
return;
}
bltMask(dx,dy,op,srcdev,seldev.data(),opacity,sx,sy,sw,sh);
}
void KisPainter::bltMask(TQ_INT32 dx, TQ_INT32 dy,
const KisCompositeOp &op,
KisPaintDeviceSP srcdev,
KisPaintDeviceSP seldev,
TQ_UINT8 opacity,
TQ_INT32 sx, TQ_INT32 sy,
TQ_INT32 sw, TQ_INT32 sh)
{
if (srcdev == 0) return;
if (seldev == 0) return;
if (m_device == 0) return;
TQRect srcRect = TQRect(sx, sy, sw, sh);
if (srcdev->extentIsValid() && op != COMPOSITE_COPY) {
srcRect &= srcdev->extent();
}
if (srcRect.isEmpty()) {
return;
}
dx += srcRect.x() - sx;
dy += srcRect.y() - sy;
sx = srcRect.x();
sy = srcRect.y();
sw = srcRect.width();
sh = srcRect.height();
addDirtyRect(TQRect(dx, dy, sw, sh));
KisColorSpace * srcCs = srcdev->colorSpace();
TQ_INT32 dstY = dy;
TQ_INT32 srcY = sy;
TQ_INT32 rowsRemaining = sh;
while (rowsRemaining > 0) {
TQ_INT32 dstX = dx;
TQ_INT32 srcX = sx;
TQ_INT32 columnsRemaining = sw;
TQ_INT32 numContiguousDstRows = m_device->numContiguousRows(dstY, dstX, dstX + sw - 1);
TQ_INT32 numContiguousSrcRows = srcdev->numContiguousRows(srcY, srcX, srcX + sw - 1);
TQ_INT32 numContiguousSelRows = seldev->numContiguousRows(dstY, dstX, dstX + sw - 1);
TQ_INT32 rows = TQMIN(numContiguousDstRows, numContiguousSrcRows);
rows = TQMIN(numContiguousSelRows, rows);
rows = TQMIN(rows, rowsRemaining);
while (columnsRemaining > 0) {
TQ_INT32 numContiguousDstColumns = m_device->numContiguousColumns(dstX, dstY, dstY + rows - 1);
TQ_INT32 numContiguousSrcColumns = srcdev->numContiguousColumns(srcX, srcY, srcY + rows - 1);
TQ_INT32 numContiguousSelColumns = seldev->numContiguousColumns(dstX, dstY, dstY + rows - 1);
TQ_INT32 columns = TQMIN(numContiguousDstColumns, numContiguousSrcColumns);
columns = TQMIN(numContiguousSelColumns, columns);
columns = TQMIN(columns, columnsRemaining);
//TQ_UINT8 *dstData = m_device->writablePixel(dstX, dstY);
TQ_INT32 dstRowStride = m_device->rowStride(dstX, dstY);
KisHLineIteratorPixel dstIt = m_device->createHLineIterator(dstX, dstY, columns, true);
TQ_UINT8 *dstData = dstIt.rawData();
//const TQ_UINT8 *srcData = srcdev->pixel(srcX, srcY);
TQ_INT32 srcRowStride = srcdev->rowStride(srcX, srcY);
KisHLineIteratorPixel srcIt = srcdev->createHLineIterator(srcX, srcY, columns, false);
const TQ_UINT8 *srcData = srcIt.rawData();
//const TQ_UINT8 *selData = seldev->pixel(dstX, dstY);
TQ_INT32 selRowStride = seldev->rowStride(dstX, dstY);
KisHLineIteratorPixel selIt = seldev->createHLineIterator(dstX, dstY, columns, false);
const TQ_UINT8 *selData = selIt.rawData();
m_colorSpace->bitBlt(dstData,
dstRowStride,
srcCs,
srcData,
srcRowStride,
selData,
selRowStride,
opacity,
rows,
columns,
op);
srcX += columns;
dstX += columns;
columnsRemaining -= columns;
}
srcY += rows;
dstY += rows;
rowsRemaining -= rows;
}
}
void KisPainter::bltSelection(TQ_INT32 dx, TQ_INT32 dy,
const KisCompositeOp& op,
KisPaintDeviceSP srcdev,
TQ_UINT8 opacity,
TQ_INT32 sx, TQ_INT32 sy,
TQ_INT32 sw, TQ_INT32 sh)
{
if (m_device == 0) return;
if (!m_device->hasSelection()) {
bitBlt(dx, dy, op, srcdev, opacity, sx, sy, sw, sh);
}
else
bltSelection(dx,dy,op,srcdev, m_device->selection(),opacity,sx,sy,sw,sh);
}
double KisPainter::paintLine(const KisPoint & pos1,
const double pressure1,
const double xTilt1,
const double yTilt1,
const KisPoint & pos2,
const double pressure2,
const double xTilt2,
const double yTilt2,
const double inSavedDist)
{
if (!m_device) return 0;
if (!m_paintOp) return 0;
if (!m_brush) return 0;
double savedDist = inSavedDist;
KisVector2D end(pos2);
KisVector2D start(pos1);
KisVector2D dragVec = end - start;
KisVector2D movement = dragVec;
if (savedDist < 0) {
m_paintOp->paintAt(pos1, KisPaintInformation(pressure1, xTilt1, yTilt1, movement));
savedDist = 0;
}
double xSpacing = 0;
double ySpacing = 0;
if ( m_varyBrushSpacingWithPressureWhenDrawingALine ) {
// XXX: The spacing should vary as the pressure changes along the
// line.
// This is a quick simplification.
xSpacing = m_brush->xSpacing((pressure1 + pressure2) / 2);
ySpacing = m_brush->ySpacing((pressure1 + pressure2) / 2);
}
else {
xSpacing = m_brush->xSpacing( PRESSURE_DEFAULT );
ySpacing = m_brush->ySpacing( PRESSURE_DEFAULT );
}
if (xSpacing < 0.5) {
xSpacing = 0.5;
}
if (ySpacing < 0.5) {
ySpacing = 0.5;
}
double xScale = 1;
double yScale = 1;
double spacing;
// Scale x or y so that we effectively have a square brush
// and calculate distance in that coordinate space. We reverse this scaling
// before drawing the brush. This produces the correct spacing in both
// x and y directions, even if the brush's aspect ratio is not 1:1.
if (xSpacing > ySpacing) {
yScale = xSpacing / ySpacing;
spacing = xSpacing;
}
else {
xScale = ySpacing / xSpacing;
spacing = ySpacing;
}
dragVec.setX(dragVec.x() * xScale);
dragVec.setY(dragVec.y() * yScale);
double newDist = dragVec.length();
double dist = savedDist + newDist;
double l_savedDist = savedDist;
if (dist < spacing) {
return dist;
}
dragVec.normalize();
KisVector2D step(0, 0);
while (dist >= spacing) {
if (l_savedDist > 0) {
step += dragVec * (spacing - l_savedDist);
l_savedDist -= spacing;
}
else {
step += dragVec * spacing;
}
KisPoint p(start.x() + (step.x() / xScale), start.y() + (step.y() / yScale));
double distanceMoved = step.length();
double t = 0;
if (newDist > DBL_EPSILON) {
t = distanceMoved / newDist;
}
double pressure = (1 - t) * pressure1 + t * pressure2;
double xTilt = (1 - t) * xTilt1 + t * xTilt2;
double yTilt = (1 - t) * yTilt1 + t * yTilt2;
m_paintOp->paintAt(p, KisPaintInformation(pressure, xTilt, yTilt, movement));
dist -= spacing;
}
if (dist > 0)
return dist;
else
return 0;
}
void KisPainter::paintPolyline (const vKisPoint &points,
int index, int numPoints)
{
if (index >= (int) points.count ())
return;
if (numPoints < 0)
numPoints = points.count ();
if (index + numPoints > (int) points.count ())
numPoints = points.count () - index;
for (int i = index; i < index + numPoints - 1; i++)
{
paintLine (points [index], 0/*pressure*/, 0, 0, points [index + 1],
0/*pressure*/, 0, 0);
}
}
void KisPainter::getBezierCurvePoints(const KisPoint &pos1,
const KisPoint &control1,
const KisPoint &control2,
const KisPoint &pos2,
vKisPoint& points)
{
double d1 = pointToLineDistance(control1, pos1, pos2);
double d2 = pointToLineDistance(control2, pos1, pos2);
if (d1 < BEZIER_FLATNESS_THRESHOLD && d2 < BEZIER_FLATNESS_THRESHOLD) {
points.push_back(pos1);
} else {
// Midpoint subdivision. See Foley & Van Dam Computer Graphics P.508
KisVector2D p1 = pos1;
KisVector2D p2 = control1;
KisVector2D p3 = control2;
KisVector2D p4 = pos2;
KisVector2D l2 = (p1 + p2) / 2;
KisVector2D h = (p2 + p3) / 2;
KisVector2D l3 = (l2 + h) / 2;
KisVector2D r3 = (p3 + p4) / 2;
KisVector2D r2 = (h + r3) / 2;
KisVector2D l4 = (l3 + r2) / 2;
KisVector2D r1 = l4;
KisVector2D l1 = p1;
KisVector2D r4 = p4;
getBezierCurvePoints(l1.toKisPoint(), l2.toKisPoint(), l3.toKisPoint(), l4.toKisPoint(), points);
getBezierCurvePoints(r1.toKisPoint(), r2.toKisPoint(), r3.toKisPoint(), r4.toKisPoint(), points);
}
}
double KisPainter::paintBezierCurve(const KisPoint &pos1,
const double pressure1,
const double xTilt1,
const double yTilt1,
const KisPoint &control1,
const KisPoint &control2,
const KisPoint &pos2,
const double pressure2,
const double xTilt2,
const double yTilt2,
const double savedDist)
{
double newDistance;
double d1 = pointToLineDistance(control1, pos1, pos2);
double d2 = pointToLineDistance(control2, pos1, pos2);
if (d1 < BEZIER_FLATNESS_THRESHOLD && d2 < BEZIER_FLATNESS_THRESHOLD) {
newDistance = paintLine(pos1, pressure1, xTilt1, yTilt1, pos2, pressure2, xTilt2, yTilt2, savedDist);
} else {
// Midpoint subdivision. See Foley & Van Dam Computer Graphics P.508
KisVector2D p1 = pos1;
KisVector2D p2 = control1;
KisVector2D p3 = control2;
KisVector2D p4 = pos2;
KisVector2D l2 = (p1 + p2) / 2;
KisVector2D h = (p2 + p3) / 2;
KisVector2D l3 = (l2 + h) / 2;
KisVector2D r3 = (p3 + p4) / 2;
KisVector2D r2 = (h + r3) / 2;
KisVector2D l4 = (l3 + r2) / 2;
KisVector2D r1 = l4;
KisVector2D l1 = p1;
KisVector2D r4 = p4;
double midPressure = (pressure1 + pressure2) / 2;
double midXTilt = (xTilt1 + xTilt2) / 2;
double midYTilt = (yTilt1 + yTilt2) / 2;
newDistance = paintBezierCurve(l1.toKisPoint(), pressure1, xTilt1, yTilt1,
l2.toKisPoint(), l3.toKisPoint(),
l4.toKisPoint(), midPressure, midXTilt, midYTilt,
savedDist);
newDistance = paintBezierCurve(r1.toKisPoint(), midPressure, midXTilt, midYTilt,
r2.toKisPoint(),
r3.toKisPoint(),
r4.toKisPoint(), pressure2, xTilt2, yTilt2, newDistance);
}
return newDistance;
}
void KisPainter::paintRect (const KisPoint &startPoint,
const KisPoint &endPoint,
const double /*pressure*/,
const double /*xTilt*/,
const double /*yTilt*/)
{
KoRect normalizedRect = KisRect (startPoint, endPoint).normalize ();
vKisPoint points;
points.push_back(normalizedRect.topLeft());
points.push_back(normalizedRect.bottomLeft());
points.push_back(normalizedRect.bottomRight());
points.push_back(normalizedRect.topRight());
paintPolygon(points);
}
void KisPainter::paintEllipse (const KisPoint &startPoint,
const KisPoint &endPoint,
const double /*pressure*/,
const double /*xTilt*/,
const double /*yTilt*/)
{
KisRect r = KisRect(startPoint, endPoint).normalize();
// See http://www.whizkidtech.redprince.net/bezier/circle/ for explanation.
// kappa = (4/3*(sqrt(2)-1))
const double kappa = 0.5522847498;
const double lx = (r.width() / 2) * kappa;
const double ly = (r.height() / 2) * kappa;
KisPoint center = r.center();
KisPoint p0(r.left(), center.y());
KisPoint p1(r.left(), center.y() - ly);
KisPoint p2(center.x() - lx, r.top());
KisPoint p3(center.x(), r.top());
vKisPoint points;
getBezierCurvePoints(p0, p1, p2, p3, points);
KisPoint p4(center.x() + lx, r.top());
KisPoint p5(r.right(), center.y() - ly);
KisPoint p6(r.right(), center.y());
getBezierCurvePoints(p3, p4, p5, p6, points);
KisPoint p7(r.right(), center.y() + ly);
KisPoint p8(center.x() + lx, r.bottom());
KisPoint p9(center.x(), r.bottom());
getBezierCurvePoints(p6, p7, p8, p9, points);
KisPoint p10(center.x() - lx, r.bottom());
KisPoint p11(r.left(), center.y() + ly);
getBezierCurvePoints(p9, p10, p11, p0, points);
paintPolygon(points);
}
void KisPainter::paintAt(const KisPoint & pos,
const double pressure,
const double xTilt,
const double yTilt)
{
if (!m_paintOp) return;
m_paintOp->paintAt(pos, KisPaintInformation(pressure, xTilt, yTilt, KisVector2D()));
}
double KisPainter::pointToLineDistance(const KisPoint& p, const KisPoint& l0, const KisPoint& l1)
{
double lineLength = sqrt((l1.x() - l0.x()) * (l1.x() - l0.x()) + (l1.y() - l0.y()) * (l1.y() - l0.y()));
double distance = 0;
if (lineLength > DBL_EPSILON) {
distance = ((l0.y() - l1.y()) * p.x() + (l1.x() - l0.x()) * p.y() + l0.x() * l1.y() - l1.x() * l0.y()) / lineLength;
distance = fabs(distance);
}
return distance;
}
/*
* Concave Polygon Scan Conversion
* by Paul Heckbert
* from "Graphics Gems", Academic Press, 1990
*/
/*
* concave: scan convert nvert-sided concave non-simple polygon with vertices at
* (point[i].x, point[i].y) for i in [0..nvert-1] within the window win by
* calling spanproc for each visible span of pixels.
* Polygon can be clockwise or counterclockwise.
* Algorithm does uniform point sampling at pixel centers.
* Inside-outside test done by Jordan's rule: a point is considered inside if
* an emanating ray intersects the polygon an odd number of times.
* drawproc should fill in pixels from xl to xr inclusive on scanline y,
* e.g:
* drawproc(y, xl, xr)
* int y, xl, xr;
* {
* int x;
* for (x=xl; x<=xr; x++)
* pixel_write(x, y, pixelvalue);
* }
*
* Paul Heckbert 30 June 81, 18 Dec 89
*/
typedef struct { /* a polygon edge */
double x; /* x coordinate of edge's intersection with current scanline */
double dx; /* change in x with respect to y */
int i; /* edge number: edge i goes from pt[i] to pt[i+1] */
} Edge;
static int n; /* number of vertices */
static const KisPoint *pt; /* vertices */
static int nact; /* number of active edges */
static Edge *active; /* active edge list:edges crossing scanline y */
/* comparison routines for qsort */
static int compare_ind(const void *pu, const void *pv)
{
const int *u = static_cast<const int *>(pu);
const int *v = static_cast<const int *>(pv);
return pt[*u].y() <= pt[*v].y() ? -1 : 1;
}
static int compare_active(const void *pu, const void *pv)
{
const Edge *u = static_cast<const Edge *>(pu);
const Edge *v = static_cast<const Edge *>(pv);
return u->x <= v->x ? -1 : 1;
}
static void cdelete(int i) /* remove edge i from active list */
{
int j;
for (j=0; j<nact && active[j].i!=i; j++);
if (j>=nact) return; /* edge not in active list; happens at win->y0*/
nact--;
bcopy(&active[j+1], &active[j], (nact-j)*sizeof active[0]);
}
static void cinsert(int i, int y) /* append edge i to end of active list */
{
int j;
double dx;
const KisPoint *p, *q;
j = i<n-1 ? i+1 : 0;
if (pt[i].y() < pt[j].y()) {
p = &pt[i]; q = &pt[j];
} else {
p = &pt[j]; q = &pt[i];
}
/* initialize x position at intersection of edge with scanline y */
active[nact].dx = dx = (q->x()-p->x())/(q->y()-p->y());
active[nact].x = dx*(y+.5-p->y())+p->x();
active[nact].i = i;
nact++;
}
void KisPainter::fillPolygon(const vKisPoint& points, FillStyle fillStyle)
{
int nvert = points.count();
int k, y0, y1, y, i, j, xl, xr;
int *ind; /* list of vertex indices, sorted by pt[ind[j]].y */
n = nvert;
pt = &(points[0]);
if (n<3) return;
if (fillStyle == FillStyleNone) {
return;
}
ind = new int[n];
TQ_CHECK_PTR(ind);
active = new Edge[n];
TQ_CHECK_PTR(active);
/* create y-sorted array of indices ind[k] into vertex list */
for (k=0; k<n; k++)
ind[k] = k;
qsort(ind, n, sizeof ind[0], compare_ind); /* sort ind by pt[ind[k]].y */
nact = 0; /* start with empty active list */
k = 0; /* ind[k] is next vertex to process */
y0 = static_cast<int>(ceil(pt[ind[0]].y()-.5)); /* ymin of polygon */
y1 = static_cast<int>(floor(pt[ind[n-1]].y()-.5)); /* ymax of polygon */
int x0 = INT_MAX;
int x1 = INT_MIN;
for (int i = 0; i < nvert; i++) {
int pointHighX = static_cast<int>(ceil(points[i].x() - 0.5));
int pointLowX = static_cast<int>(floor(points[i].x() - 0.5));
if (pointLowX < x0) {
x0 = pointLowX;
}
if (pointHighX > x1) {
x1 = pointHighX;
}
}
// Fill the polygon bounding rectangle with the required contents then we'll
// create a mask for the actual polygon coverage.
KisPaintDeviceSP polygon = new KisPaintDevice(m_device->colorSpace(), "polygon");
TQ_CHECK_PTR(polygon);
KisFillPainter fillPainter(polygon);
TQRect boundingRectangle(x0, y0, x1 - x0 + 1, y1 - y0 + 1);
// Clip to the image bounds.
if (m_device->image()) {
boundingRectangle &= m_device->image()->bounds();
}
switch (fillStyle) {
default:
// Fall through
case FillStyleGradient:
// Currently unsupported, fall through
case FillStyleStrokes:
// Currently unsupported, fall through
kdWarning(DBG_AREA_CORE) << "Unknown or unsupported fill style in fillPolygon\n";
case FillStyleForegroundColor:
fillPainter.fillRect(boundingRectangle, paintColor(), OPACITY_OPAQUE);
break;
case FillStyleBackgroundColor:
fillPainter.fillRect(boundingRectangle, backgroundColor(), OPACITY_OPAQUE);
break;
case FillStylePattern:
Q_ASSERT(m_pattern != 0);
fillPainter.fillRect(boundingRectangle, m_pattern);
break;
}
KisSelectionSP polygonMask = new KisSelection(polygon);
for (y=y0; y<=y1; y++) { /* step through scanlines */
/* scanline y is at y+.5 in continuous coordinates */
/* check vertices between previous scanline and current one, if any */
for (; k<n && pt[ind[k]].y()<=y+.5; k++) {
/* to simplify, if pt.y=y+.5, pretend it's above */
/* invariant: y-.5 < pt[i].y <= y+.5 */
i = ind[k];
/*
* insert or delete edges before and after vertex i (i-1 to i,
* and i to i+1) from active list if they cross scanline y
*/
j = i>0 ? i-1 : n-1; /* vertex previous to i */
if (pt[j].y() <= y-.5) /* old edge, remove from active list */
cdelete(j);
else if (pt[j].y() > y+.5) /* new edge, add to active list */
cinsert(j, y);
j = i<n-1 ? i+1 : 0; /* vertex next after i */
if (pt[j].y() <= y-.5) /* old edge, remove from active list */
cdelete(i);
else if (pt[j].y() > y+.5) /* new edge, add to active list */
cinsert(i, y);
}
/* sort active edge list by active[j].x */
qsort(active, nact, sizeof active[0], compare_active);
/* draw horizontal segments for scanline y */
for (j=0; j<nact; j+=2) { /* draw horizontal segments */
/* span 'tween j & j+1 is inside, span tween j+1 & j+2 is outside */
xl = static_cast<int>(ceil(active[j].x-.5)); /* left end of span */
xr = static_cast<int>(floor(active[j+1].x-.5)); /* right end of span */
if (xl<=xr) {
KisHLineIterator it = polygonMask->createHLineIterator(xl, y, xr - xl + 1, true);
while (!it.isDone()) {
// We're using a selection here, that means alpha colorspace, that means one byte.
it.rawData()[0] = MAX_SELECTED;
++it;
}
}
active[j].x += active[j].dx; /* increment edge coords */
active[j+1].x += active[j+1].dx;
}
}
delete [] ind;
delete [] active;
polygon->applySelectionMask(polygonMask);
TQRect r = polygon->extent();
// The strokes for the outline may have already added updated the dirtyrect, but it can't hurt,
// and if we're painting without outlines, then there will be no dirty rect. Let's do it ourselves...
// addDirtyRect( r ); // XXX the bltSelection will add to the dirtyrect
bltSelection(r.x(), r.y(), compositeOp(), polygon, opacity(), r.x(), r.y(), r.width(), r.height());
}
void KisPainter::paintPolygon(const vKisPoint& points)
{
if (m_fillStyle != FillStyleNone) {
fillPolygon(points, m_fillStyle);
}
if (m_strokeStyle != StrokeStyleNone) {
if (points.count() > 1) {
double distance = -1;
for (uint i = 0; i < points.count() - 1; i++) {
distance = paintLine(points[i], PRESSURE_DEFAULT, 0, 0, points[i + 1], PRESSURE_DEFAULT, 0, 0, distance);
}
paintLine(points[points.count() - 1], PRESSURE_DEFAULT, 0, 0, points[0], PRESSURE_DEFAULT, 0, 0, distance);
}
}
}
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