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724 lines
22 KiB
724 lines
22 KiB
/*
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* Copyright (c) 2004 Adrian Page <adrian@pagenet.plus.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <cfloat>
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#include "qbrush.h"
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#include "qcolor.h"
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#include "qfontinfo.h"
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#include "qfontmetrics.h"
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#include "qpen.h"
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#include "qregion.h"
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#include "qwmatrix.h"
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#include <qimage.h>
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#include <qmap.h>
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#include <qpainter.h>
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#include <qpixmap.h>
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#include <qpointarray.h>
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#include <qrect.h>
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#include <qstring.h>
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#include <kdebug.h>
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#include <klocale.h>
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#include "kis_brush.h"
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#include "kis_debug_areas.h"
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#include "kis_gradient.h"
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#include "kis_image.h"
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#include "kis_iterators_pixel.h"
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#include "kis_layer.h"
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#include "kis_paint_device.h"
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#include "kis_pattern.h"
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#include "kis_rect.h"
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#include "kis_colorspace.h"
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#include "kis_types.h"
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#include "kis_vec.h"
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#include "kis_selection.h"
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#include "kis_gradient_painter.h"
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#include "kis_meta_registry.h"
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#include "kis_colorspace_factory_registry.h"
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namespace {
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class GradientShapeStrategy {
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public:
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GradientShapeStrategy(const KisPoint& gradientVectorStart, const KisPoint& gradientVectorEnd);
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virtual ~GradientShapeStrategy() {}
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virtual double valueAt(double x, double y) const = 0;
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protected:
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KisPoint m_gradientVectorStart;
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KisPoint m_gradientVectorEnd;
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};
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GradientShapeStrategy::GradientShapeStrategy(const KisPoint& gradientVectorStart, const KisPoint& gradientVectorEnd)
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: m_gradientVectorStart(gradientVectorStart), m_gradientVectorEnd(gradientVectorEnd)
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{
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}
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class LinearGradientStrategy : public GradientShapeStrategy {
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typedef GradientShapeStrategy super;
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public:
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LinearGradientStrategy(const KisPoint& gradientVectorStart, const KisPoint& gradientVectorEnd);
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virtual double valueAt(double x, double y) const;
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protected:
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double m_normalisedVectorX;
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double m_normalisedVectorY;
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double m_vectorLength;
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};
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LinearGradientStrategy::LinearGradientStrategy(const KisPoint& gradientVectorStart, const KisPoint& gradientVectorEnd)
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: super(gradientVectorStart, gradientVectorEnd)
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{
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double dx = gradientVectorEnd.x() - gradientVectorStart.x();
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double dy = gradientVectorEnd.y() - gradientVectorStart.y();
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m_vectorLength = sqrt((dx * dx) + (dy * dy));
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if (m_vectorLength < DBL_EPSILON) {
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m_normalisedVectorX = 0;
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m_normalisedVectorY = 0;
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}
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else {
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m_normalisedVectorX = dx / m_vectorLength;
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m_normalisedVectorY = dy / m_vectorLength;
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}
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}
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double LinearGradientStrategy::valueAt(double x, double y) const
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{
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double vx = x - m_gradientVectorStart.x();
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double vy = y - m_gradientVectorStart.y();
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// Project the vector onto the normalised gradient vector.
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double t = vx * m_normalisedVectorX + vy * m_normalisedVectorY;
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if (m_vectorLength < DBL_EPSILON) {
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t = 0;
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}
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else {
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// Scale to 0 to 1 over the gradient vector length.
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t /= m_vectorLength;
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}
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return t;
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}
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class BiLinearGradientStrategy : public LinearGradientStrategy {
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typedef LinearGradientStrategy super;
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public:
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BiLinearGradientStrategy(const KisPoint& gradientVectorStart, const KisPoint& gradientVectorEnd);
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virtual double valueAt(double x, double y) const;
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};
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BiLinearGradientStrategy::BiLinearGradientStrategy(const KisPoint& gradientVectorStart, const KisPoint& gradientVectorEnd)
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: super(gradientVectorStart, gradientVectorEnd)
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{
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}
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double BiLinearGradientStrategy::valueAt(double x, double y) const
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{
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double t = super::valueAt(x, y);
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// Reflect
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if (t < -DBL_EPSILON) {
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t = -t;
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}
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return t;
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}
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class RadialGradientStrategy : public GradientShapeStrategy {
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typedef GradientShapeStrategy super;
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public:
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RadialGradientStrategy(const KisPoint& gradientVectorStart, const KisPoint& gradientVectorEnd);
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virtual double valueAt(double x, double y) const;
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protected:
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double m_radius;
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};
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RadialGradientStrategy::RadialGradientStrategy(const KisPoint& gradientVectorStart, const KisPoint& gradientVectorEnd)
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: super(gradientVectorStart, gradientVectorEnd)
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{
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double dx = gradientVectorEnd.x() - gradientVectorStart.x();
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double dy = gradientVectorEnd.y() - gradientVectorStart.y();
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m_radius = sqrt((dx * dx) + (dy * dy));
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}
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double RadialGradientStrategy::valueAt(double x, double y) const
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{
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double dx = x - m_gradientVectorStart.x();
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double dy = y - m_gradientVectorStart.y();
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double distance = sqrt((dx * dx) + (dy * dy));
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double t;
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if (m_radius < DBL_EPSILON) {
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t = 0;
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}
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else {
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t = distance / m_radius;
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}
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return t;
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}
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class SquareGradientStrategy : public GradientShapeStrategy {
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typedef GradientShapeStrategy super;
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public:
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SquareGradientStrategy(const KisPoint& gradientVectorStart, const KisPoint& gradientVectorEnd);
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virtual double valueAt(double x, double y) const;
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protected:
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double m_normalisedVectorX;
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double m_normalisedVectorY;
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double m_vectorLength;
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};
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SquareGradientStrategy::SquareGradientStrategy(const KisPoint& gradientVectorStart, const KisPoint& gradientVectorEnd)
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: super(gradientVectorStart, gradientVectorEnd)
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{
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double dx = gradientVectorEnd.x() - gradientVectorStart.x();
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double dy = gradientVectorEnd.y() - gradientVectorStart.y();
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m_vectorLength = sqrt((dx * dx) + (dy * dy));
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if (m_vectorLength < DBL_EPSILON) {
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m_normalisedVectorX = 0;
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m_normalisedVectorY = 0;
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}
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else {
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m_normalisedVectorX = dx / m_vectorLength;
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m_normalisedVectorY = dy / m_vectorLength;
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}
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}
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double SquareGradientStrategy::valueAt(double x, double y) const
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{
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double px = x - m_gradientVectorStart.x();
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double py = y - m_gradientVectorStart.y();
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double distance1 = 0;
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double distance2 = 0;
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if (m_vectorLength > DBL_EPSILON) {
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// Point to line distance is:
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// distance = ((l0.y() - l1.y()) * p.x() + (l1.x() - l0.x()) * p.y() + l0.x() * l1.y() - l1.x() * l0.y()) / m_vectorLength;
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//
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// Here l0 = (0, 0) and |l1 - l0| = 1
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distance1 = -m_normalisedVectorY * px + m_normalisedVectorX * py;
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distance1 = fabs(distance1);
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// Rotate point by 90 degrees and get the distance to the perpendicular
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distance2 = -m_normalisedVectorY * -py + m_normalisedVectorX * px;
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distance2 = fabs(distance2);
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}
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double t = QMAX(distance1, distance2) / m_vectorLength;
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return t;
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}
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class ConicalGradientStrategy : public GradientShapeStrategy {
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typedef GradientShapeStrategy super;
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public:
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ConicalGradientStrategy(const KisPoint& gradientVectorStart, const KisPoint& gradientVectorEnd);
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virtual double valueAt(double x, double y) const;
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protected:
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double m_vectorAngle;
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};
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ConicalGradientStrategy::ConicalGradientStrategy(const KisPoint& gradientVectorStart, const KisPoint& gradientVectorEnd)
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: super(gradientVectorStart, gradientVectorEnd)
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{
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double dx = gradientVectorEnd.x() - gradientVectorStart.x();
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double dy = gradientVectorEnd.y() - gradientVectorStart.y();
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// Get angle from 0 to 2 PI.
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m_vectorAngle = atan2(dy, dx) + M_PI;
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}
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double ConicalGradientStrategy::valueAt(double x, double y) const
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{
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double px = x - m_gradientVectorStart.x();
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double py = y - m_gradientVectorStart.y();
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double angle = atan2(py, px) + M_PI;
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angle -= m_vectorAngle;
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if (angle < 0) {
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angle += 2 * M_PI;
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}
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double t = angle / (2 * M_PI);
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return t;
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}
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class ConicalSymetricGradientStrategy : public GradientShapeStrategy {
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typedef GradientShapeStrategy super;
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public:
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ConicalSymetricGradientStrategy(const KisPoint& gradientVectorStart, const KisPoint& gradientVectorEnd);
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virtual double valueAt(double x, double y) const;
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protected:
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double m_vectorAngle;
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};
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ConicalSymetricGradientStrategy::ConicalSymetricGradientStrategy(const KisPoint& gradientVectorStart, const KisPoint& gradientVectorEnd)
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: super(gradientVectorStart, gradientVectorEnd)
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{
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double dx = gradientVectorEnd.x() - gradientVectorStart.x();
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double dy = gradientVectorEnd.y() - gradientVectorStart.y();
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// Get angle from 0 to 2 PI.
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m_vectorAngle = atan2(dy, dx) + M_PI;
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}
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double ConicalSymetricGradientStrategy::valueAt(double x, double y) const
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{
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double px = x - m_gradientVectorStart.x();
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double py = y - m_gradientVectorStart.y();
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double angle = atan2(py, px) + M_PI;
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angle -= m_vectorAngle;
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if (angle < 0) {
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angle += 2 * M_PI;
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}
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double t;
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if (angle < M_PI) {
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t = angle / M_PI;
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}
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else {
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t = 1 - ((angle - M_PI) / M_PI);
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}
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return t;
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}
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class GradientRepeatStrategy {
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public:
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GradientRepeatStrategy() {}
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virtual ~GradientRepeatStrategy() {}
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virtual double valueAt(double t) const = 0;
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};
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class GradientRepeatNoneStrategy : public GradientRepeatStrategy {
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public:
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static GradientRepeatNoneStrategy *instance();
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virtual double valueAt(double t) const;
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private:
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GradientRepeatNoneStrategy() {}
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static GradientRepeatNoneStrategy *m_instance;
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};
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GradientRepeatNoneStrategy *GradientRepeatNoneStrategy::m_instance = 0;
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GradientRepeatNoneStrategy *GradientRepeatNoneStrategy::instance()
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{
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if (m_instance == 0) {
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m_instance = new GradientRepeatNoneStrategy();
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Q_CHECK_PTR(m_instance);
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}
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return m_instance;
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}
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// Output is clamped to 0 to 1.
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double GradientRepeatNoneStrategy::valueAt(double t) const
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{
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double value = t;
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if (t < DBL_EPSILON) {
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value = 0;
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}
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else
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if (t > 1 - DBL_EPSILON) {
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value = 1;
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}
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return value;
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}
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class GradientRepeatForwardsStrategy : public GradientRepeatStrategy {
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public:
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static GradientRepeatForwardsStrategy *instance();
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virtual double valueAt(double t) const;
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private:
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GradientRepeatForwardsStrategy() {}
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static GradientRepeatForwardsStrategy *m_instance;
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};
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GradientRepeatForwardsStrategy *GradientRepeatForwardsStrategy::m_instance = 0;
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GradientRepeatForwardsStrategy *GradientRepeatForwardsStrategy::instance()
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{
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if (m_instance == 0) {
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m_instance = new GradientRepeatForwardsStrategy();
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Q_CHECK_PTR(m_instance);
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}
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return m_instance;
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}
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// Output is 0 to 1, 0 to 1, 0 to 1...
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double GradientRepeatForwardsStrategy::valueAt(double t) const
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{
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int i = static_cast<int>(t);
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if (t < DBL_EPSILON) {
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i--;
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}
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double value = t - i;
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return value;
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}
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class GradientRepeatAlternateStrategy : public GradientRepeatStrategy {
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public:
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static GradientRepeatAlternateStrategy *instance();
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virtual double valueAt(double t) const;
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private:
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GradientRepeatAlternateStrategy() {}
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static GradientRepeatAlternateStrategy *m_instance;
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};
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GradientRepeatAlternateStrategy *GradientRepeatAlternateStrategy::m_instance = 0;
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GradientRepeatAlternateStrategy *GradientRepeatAlternateStrategy::instance()
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{
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if (m_instance == 0) {
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m_instance = new GradientRepeatAlternateStrategy();
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Q_CHECK_PTR(m_instance);
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}
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return m_instance;
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}
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// Output is 0 to 1, 1 to 0, 0 to 1, 1 to 0...
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double GradientRepeatAlternateStrategy::valueAt(double t) const
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{
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if (t < 0) {
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t = -t;
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}
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int i = static_cast<int>(t);
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double value = t - i;
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if (i % 2 == 1) {
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value = 1 - value;
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}
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return value;
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}
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}
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KisGradientPainter::KisGradientPainter()
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: super()
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{
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m_gradient = 0;
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}
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KisGradientPainter::KisGradientPainter(KisPaintDeviceSP device) : super(device), m_gradient(0)
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{
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}
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bool KisGradientPainter::paintGradient(const KisPoint& gradientVectorStart,
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const KisPoint& gradientVectorEnd,
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enumGradientShape shape,
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enumGradientRepeat repeat,
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double antiAliasThreshold,
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bool reverseGradient,
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Q_INT32 startx,
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Q_INT32 starty,
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Q_INT32 width,
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Q_INT32 height)
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{
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m_cancelRequested = false;
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if (!m_gradient) return false;
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GradientShapeStrategy *shapeStrategy = 0;
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switch (shape) {
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case GradientShapeLinear:
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shapeStrategy = new LinearGradientStrategy(gradientVectorStart, gradientVectorEnd);
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break;
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case GradientShapeBiLinear:
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shapeStrategy = new BiLinearGradientStrategy(gradientVectorStart, gradientVectorEnd);
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break;
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case GradientShapeRadial:
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shapeStrategy = new RadialGradientStrategy(gradientVectorStart, gradientVectorEnd);
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break;
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case GradientShapeSquare:
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shapeStrategy = new SquareGradientStrategy(gradientVectorStart, gradientVectorEnd);
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break;
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case GradientShapeConical:
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shapeStrategy = new ConicalGradientStrategy(gradientVectorStart, gradientVectorEnd);
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break;
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case GradientShapeConicalSymetric:
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shapeStrategy = new ConicalSymetricGradientStrategy(gradientVectorStart, gradientVectorEnd);
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break;
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}
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Q_CHECK_PTR(shapeStrategy);
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GradientRepeatStrategy *repeatStrategy = 0;
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switch (repeat) {
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case GradientRepeatNone:
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repeatStrategy = GradientRepeatNoneStrategy::instance();
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break;
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case GradientRepeatForwards:
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repeatStrategy = GradientRepeatForwardsStrategy::instance();
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break;
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case GradientRepeatAlternate:
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repeatStrategy = GradientRepeatAlternateStrategy::instance();
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break;
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}
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Q_ASSERT(repeatStrategy != 0);
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//If the device has a selection only iterate over that selection
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QRect r;
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if( m_device->hasSelection() ) {
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r = m_device->selection()->selectedExactRect();
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startx = r.x();
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starty = r.y();
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width = r.width();
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height = r.height();
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}
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Q_INT32 endx = startx + width - 1;
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Q_INT32 endy = starty + height - 1;
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QImage layer (width, height, 32);
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layer.setAlphaBuffer(true);
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int pixelsProcessed = 0;
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int lastProgressPercent = 0;
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emit notifyProgressStage(i18n("Rendering gradient..."), 0);
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int totalPixels = width * height;
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if (antiAliasThreshold < 1 - DBL_EPSILON) {
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totalPixels *= 2;
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}
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for (int y = starty; y <= endy; y++) {
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for (int x = startx; x <= endx; x++) {
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double t = shapeStrategy->valueAt( x, y);
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t = repeatStrategy->valueAt(t);
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if (reverseGradient) {
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t = 1 - t;
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}
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|
|
QColor color;
|
|
Q_UINT8 opacity;
|
|
|
|
m_gradient->colorAt(t, &color, &opacity);
|
|
|
|
layer.setPixel(x - startx, y - starty,
|
|
qRgba(color.red(), color.green(), color.blue(), opacity));
|
|
|
|
pixelsProcessed++;
|
|
|
|
int progressPercent = (pixelsProcessed * 100) / totalPixels;
|
|
|
|
if (progressPercent > lastProgressPercent) {
|
|
emit notifyProgress(progressPercent);
|
|
lastProgressPercent = progressPercent;
|
|
|
|
if (m_cancelRequested) {
|
|
break;
|
|
}
|
|
}
|
|
if (m_cancelRequested) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!m_cancelRequested && antiAliasThreshold < 1 - DBL_EPSILON) {
|
|
|
|
QColor color;
|
|
emit notifyProgressStage(i18n("Anti-aliasing gradient..."), lastProgressPercent);
|
|
Q_UINT8 * layerPointer = layer.bits();
|
|
for (int y = starty; y <= endy; y++) {
|
|
for (int x = startx; x <= endx; x++) {
|
|
|
|
double maxDistance = 0;
|
|
|
|
Q_UINT8 redThis = layerPointer[2];
|
|
Q_UINT8 greenThis = layerPointer[1];
|
|
Q_UINT8 blueThis = layerPointer[0];
|
|
Q_UINT8 thisPixelOpacity = layerPointer[3];
|
|
|
|
for (int yOffset = -1; yOffset < 2; yOffset++) {
|
|
for (int xOffset = -1; xOffset < 2; xOffset++) {
|
|
|
|
if (xOffset != 0 || yOffset != 0) {
|
|
int sampleX = x + xOffset;
|
|
int sampleY = y + yOffset;
|
|
|
|
if (sampleX >= startx && sampleX <= endx && sampleY >= starty && sampleY <= endy) {
|
|
uint x = sampleX - startx;
|
|
uint y = sampleY - starty;
|
|
Q_UINT8 * pixelPos = layer.bits() + (y * width * 4) + (x * 4);
|
|
Q_UINT8 red = *(pixelPos +2);
|
|
Q_UINT8 green = *(pixelPos + 1);
|
|
Q_UINT8 blue = *pixelPos;
|
|
Q_UINT8 opacity = *(pixelPos + 3);
|
|
|
|
double dRed = (red * opacity - redThis * thisPixelOpacity) / 65535.0;
|
|
double dGreen = (green * opacity - greenThis * thisPixelOpacity) / 65535.0;
|
|
double dBlue = (blue * opacity - blueThis * thisPixelOpacity) / 65535.0;
|
|
|
|
#define SQRT_3 1.7320508
|
|
|
|
double distance =/* sqrt(*/dRed * dRed + dGreen * dGreen + dBlue * dBlue/*) / SQRT_3*/;
|
|
|
|
if (distance > maxDistance) {
|
|
maxDistance = distance;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (maxDistance > 3.*antiAliasThreshold*antiAliasThreshold) {
|
|
const int numSamples = 4;
|
|
|
|
int totalRed = 0;
|
|
int totalGreen = 0;
|
|
int totalBlue = 0;
|
|
int totalOpacity = 0;
|
|
|
|
for (int ySample = 0; ySample < numSamples; ySample++) {
|
|
for (int xSample = 0; xSample < numSamples; xSample++) {
|
|
|
|
double sampleWidth = 1.0 / numSamples;
|
|
|
|
double sampleX = x - 0.5 + (sampleWidth / 2) + xSample * sampleWidth;
|
|
double sampleY = y - 0.5 + (sampleWidth / 2) + ySample * sampleWidth;
|
|
|
|
double t = shapeStrategy->valueAt(sampleX, sampleY);
|
|
t = repeatStrategy->valueAt(t);
|
|
|
|
if (reverseGradient) {
|
|
t = 1 - t;
|
|
}
|
|
|
|
Q_UINT8 opacity;
|
|
|
|
m_gradient->colorAt(t, &color, &opacity);
|
|
|
|
totalRed += color.red();
|
|
totalGreen += color.green();
|
|
totalBlue += color.blue();
|
|
totalOpacity += opacity;
|
|
}
|
|
}
|
|
|
|
int red = totalRed / (numSamples * numSamples);
|
|
int green = totalGreen / (numSamples * numSamples);
|
|
int blue = totalBlue / (numSamples * numSamples);
|
|
int opacity = totalOpacity / (numSamples * numSamples);
|
|
|
|
layer.setPixel(x - startx, y - starty, qRgba(red, green, blue, opacity));
|
|
}
|
|
|
|
pixelsProcessed++;
|
|
|
|
int progressPercent = (pixelsProcessed * 100) / totalPixels;
|
|
|
|
if (progressPercent > lastProgressPercent) {
|
|
emit notifyProgress(progressPercent);
|
|
lastProgressPercent = progressPercent;
|
|
|
|
if (m_cancelRequested) {
|
|
break;
|
|
}
|
|
}
|
|
layerPointer += 4;
|
|
}
|
|
|
|
if (m_cancelRequested) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!m_cancelRequested) {
|
|
kdDebug() << "Have we got a selection? " << m_device->hasSelection() << endl;
|
|
KisPaintDeviceSP dev = new KisPaintDevice(KisMetaRegistry::instance()->csRegistry()->getRGB8(), "temporary device for gradient");
|
|
dev->writeBytes(layer.bits(), startx, starty, width, height);
|
|
bltSelection(startx, starty, m_compositeOp, dev, m_opacity, startx, starty, width, height);
|
|
}
|
|
delete shapeStrategy;
|
|
|
|
emit notifyProgressDone();
|
|
|
|
return !m_cancelRequested;
|
|
}
|