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640 lines
18 KiB
640 lines
18 KiB
/*
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* kis_gradient.cc - part of Krayon
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*
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* Copyright (c) 2000 Matthias Elter <elter@kde.org>
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* 2001 John Califf
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* 2004 Boudewijn Rempt <boud@valdyas.org>
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* 2004 Adrian Page <adrian@pagenet.plus.com>
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* 2004 Sven Langkamp <longamp@reallygood.de>
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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 <cfloat>
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#include <cmath>
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#include <tqimage.h>
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#include <tqtextstream.h>
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#include <tqfile.h>
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#include <koColor.h>
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#include <kogradientmanager.h>
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#include <kdebug.h>
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#include <klocale.h>
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#include "kis_gradient.h"
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#define PREVIEW_WIDTH 64
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#define PREVIEW_HEIGHT 64
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KisGradientSegment::RGBColorInterpolationStrategy *KisGradientSegment::RGBColorInterpolationStrategy::m_instance = 0;
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KisGradientSegment::HSVCWColorInterpolationStrategy *KisGradientSegment::HSVCWColorInterpolationStrategy::m_instance = 0;
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KisGradientSegment::HSVCCWColorInterpolationStrategy *KisGradientSegment::HSVCCWColorInterpolationStrategy::m_instance = 0;
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KisGradientSegment::LinearInterpolationStrategy *KisGradientSegment::LinearInterpolationStrategy::m_instance = 0;
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KisGradientSegment::CurvedInterpolationStrategy *KisGradientSegment::CurvedInterpolationStrategy::m_instance = 0;
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KisGradientSegment::SineInterpolationStrategy *KisGradientSegment::SineInterpolationStrategy::m_instance = 0;
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KisGradientSegment::SphereIncreasingInterpolationStrategy *KisGradientSegment::SphereIncreasingInterpolationStrategy::m_instance = 0;
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KisGradientSegment::SphereDecreasingInterpolationStrategy *KisGradientSegment::SphereDecreasingInterpolationStrategy::m_instance = 0;
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KisGradient::KisGradient(const TQString& file) : super(file)
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{
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}
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KisGradient::~KisGradient()
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{
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for (uint i = 0; i < m_segments.count(); i++) {
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delete m_segments[i];
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m_segments[i] = 0;
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}
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}
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bool KisGradient::load()
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{
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return init();
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}
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bool KisGradient::save()
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{
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return false;
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}
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TQImage KisGradient::img()
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{
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return m_img;
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}
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bool KisGradient::init()
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{
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KoGradientManager gradLoader;
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KoGradient* grad = gradLoader.loadGradient(filename());
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if( !grad )
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return false;
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m_segments.clear();
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if( grad->colorStops.count() > 1 ) {
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KoColorStop *colstop;
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for(colstop = grad->colorStops.first(); colstop; colstop = grad->colorStops.next()) {
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KoColorStop *colstopNext = grad->colorStops.next();
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if(colstopNext) {
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KoColor leftRgb((int)(colstop->color1 * 255 + 0.5), (int)(colstop->color2 * 255 + 0.5), (int)(colstop->color3 * 255 + 0.5));
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KoColor rightRgb((int)(colstopNext->color1 * 255 + 0.5), (int)(colstopNext->color2 * 255 + 0.5), (int)(colstopNext->color3 * 255 + 0.5));
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double midp = colstop->midpoint;
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midp = colstop->offset + ((colstopNext->offset - colstop->offset) * midp);
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Color leftColor(leftRgb.color(), colstop->opacity);
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Color rightColor(rightRgb.color(), colstopNext->opacity);
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KisGradientSegment *segment = new KisGradientSegment(colstop->interpolation, colstop->colorType, colstop->offset, midp, colstopNext->offset, leftColor, rightColor);
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Q_CHECK_PTR(segment);
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if ( !segment->isValid() ) {
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delete segment;
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return false;
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}
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m_segments.push_back(segment);
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grad->colorStops.prev();
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}
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else {
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grad->colorStops.prev();
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break;
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}
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}
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}
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else
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return false;
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if (!m_segments.isEmpty()) {
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m_img = generatePreview(PREVIEW_WIDTH, PREVIEW_HEIGHT);
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setValid(true);
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return true;
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}
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else {
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return false;
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}
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}
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void KisGradient::setImage(const TQImage& img)
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{
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m_img = img;
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m_img.detach();
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setValid(true);
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}
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KisGradientSegment *KisGradient::segmentAt(double t) const
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{
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Q_ASSERT(t >= 0 || t <= 1);
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Q_ASSERT(!m_segments.empty());
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for(TQValueVector<KisGradientSegment *>::const_iterator it = m_segments.begin(); it!= m_segments.end(); ++it)
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{
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if (t > (*it)->startOffset() - DBL_EPSILON && t < (*it)->endOffset() + DBL_EPSILON) {
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return *it;
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}
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}
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return 0;
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}
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void KisGradient::colorAt(double t, TQColor *color, TQ_UINT8 *opacity) const
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{
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const KisGradientSegment *segment = segmentAt(t);
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Q_ASSERT(segment != 0);
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if (segment) {
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Color col = segment->colorAt(t);
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*color = col.color();
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*opacity = static_cast<TQ_UINT8>(col.alpha() * OPACITY_OPAQUE + 0.5);
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}
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}
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TQImage KisGradient::generatePreview(int width, int height) const
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{
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TQImage img(width, height, 32);
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for (int y = 0; y < img.height(); y++) {
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for (int x = 0; x < img.width(); x++) {
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int backgroundRed = 128 + 63 * ((x / 4 + y / 4) % 2);
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int backgroundGreen = backgroundRed;
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int backgroundBlue = backgroundRed;
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TQColor color;
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TQ_UINT8 opacity;
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double t = static_cast<double>(x) / (img.width() - 1);
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colorAt(t, &color, &opacity);
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double alpha = static_cast<double>(opacity) / OPACITY_OPAQUE;
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int red = static_cast<int>((1 - alpha) * backgroundRed + alpha * color.red() + 0.5);
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int green = static_cast<int>((1 - alpha) * backgroundGreen + alpha * color.green() + 0.5);
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int blue = static_cast<int>((1 - alpha) * backgroundBlue + alpha * color.blue() + 0.5);
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img.setPixel(x, y, tqRgb(red, green, blue));
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}
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}
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return img;
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}
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KisGradientSegment::KisGradientSegment(int interpolationType, int colorInterpolationType, double startOffset, double middleOffset, double endOffset, const Color& startColor, const Color& endColor)
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{
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m_interpolator = 0;
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switch (interpolationType) {
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case INTERP_LINEAR:
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m_interpolator = LinearInterpolationStrategy::instance();
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break;
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case INTERP_CURVED:
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m_interpolator = CurvedInterpolationStrategy::instance();
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break;
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case INTERP_SINE:
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m_interpolator = SineInterpolationStrategy::instance();
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break;
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case INTERP_SPHERE_INCREASING:
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m_interpolator = SphereIncreasingInterpolationStrategy::instance();
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break;
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case INTERP_SPHERE_DECREASING:
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m_interpolator = SphereDecreasingInterpolationStrategy::instance();
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break;
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}
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m_colorInterpolator = 0;
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switch (colorInterpolationType) {
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case COLOR_INTERP_RGB:
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m_colorInterpolator = RGBColorInterpolationStrategy::instance();
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break;
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case COLOR_INTERP_HSV_CCW:
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m_colorInterpolator = HSVCCWColorInterpolationStrategy::instance();
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break;
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case COLOR_INTERP_HSV_CW:
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m_colorInterpolator = HSVCWColorInterpolationStrategy::instance();
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break;
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}
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if (startOffset < DBL_EPSILON) {
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m_startOffset = 0;
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}
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else
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if (startOffset > 1 - DBL_EPSILON) {
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m_startOffset = 1;
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}
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else {
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m_startOffset = startOffset;
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}
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if (middleOffset < m_startOffset + DBL_EPSILON) {
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m_middleOffset = m_startOffset;
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}
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else
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if (middleOffset > 1 - DBL_EPSILON) {
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m_middleOffset = 1;
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}
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else {
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m_middleOffset = middleOffset;
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}
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if (endOffset < m_middleOffset + DBL_EPSILON) {
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m_endOffset = m_middleOffset;
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}
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else
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if (endOffset > 1 - DBL_EPSILON) {
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m_endOffset = 1;
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}
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else {
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m_endOffset = endOffset;
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}
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m_length = m_endOffset - m_startOffset;
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if (m_length < DBL_EPSILON) {
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m_middleT = 0.5;
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}
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else {
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m_middleT = (m_middleOffset - m_startOffset) / m_length;
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}
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m_startColor = startColor;
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m_endColor = endColor;
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}
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const Color& KisGradientSegment::startColor() const
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{
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return m_startColor;
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}
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const Color& KisGradientSegment::endColor() const
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{
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return m_endColor;
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}
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double KisGradientSegment::startOffset() const
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{
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return m_startOffset;
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}
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double KisGradientSegment::middleOffset() const
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{
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return m_middleOffset;
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}
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double KisGradientSegment::endOffset() const
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{
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return m_endOffset;
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}
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void KisGradientSegment::setStartOffset(double t)
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{
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m_startOffset = t;
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m_length = m_endOffset - m_startOffset;
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if (m_length < DBL_EPSILON) {
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m_middleT = 0.5;
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}
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else {
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m_middleT = (m_middleOffset - m_startOffset) / m_length;
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}
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}
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void KisGradientSegment::setMiddleOffset(double t)
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{
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m_middleOffset = t;
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if (m_length < DBL_EPSILON) {
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m_middleT = 0.5;
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}
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else {
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m_middleT = (m_middleOffset - m_startOffset) / m_length;
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}
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}
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void KisGradientSegment::setEndOffset(double t)
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{
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m_endOffset = t;
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m_length = m_endOffset - m_startOffset;
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if (m_length < DBL_EPSILON) {
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m_middleT = 0.5;
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}
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else {
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m_middleT = (m_middleOffset - m_startOffset) / m_length;
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}
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}
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int KisGradientSegment::interpolation() const
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{
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return m_interpolator->type();
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}
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void KisGradientSegment::setInterpolation(int interpolationType)
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{
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switch (interpolationType) {
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case INTERP_LINEAR:
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m_interpolator = LinearInterpolationStrategy::instance();
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break;
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case INTERP_CURVED:
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m_interpolator = CurvedInterpolationStrategy::instance();
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break;
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case INTERP_SINE:
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m_interpolator = SineInterpolationStrategy::instance();
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break;
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case INTERP_SPHERE_INCREASING:
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m_interpolator = SphereIncreasingInterpolationStrategy::instance();
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break;
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case INTERP_SPHERE_DECREASING:
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m_interpolator = SphereDecreasingInterpolationStrategy::instance();
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break;
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}
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}
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int KisGradientSegment::colorInterpolation() const
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{
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return m_colorInterpolator->type();
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}
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void KisGradientSegment::setColorInterpolation(int colorInterpolationType)
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{
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switch (colorInterpolationType) {
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case COLOR_INTERP_RGB:
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m_colorInterpolator = RGBColorInterpolationStrategy::instance();
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break;
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case COLOR_INTERP_HSV_CCW:
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m_colorInterpolator = HSVCCWColorInterpolationStrategy::instance();
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break;
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case COLOR_INTERP_HSV_CW:
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m_colorInterpolator = HSVCWColorInterpolationStrategy::instance();
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break;
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}
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}
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Color KisGradientSegment::colorAt(double t) const
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{
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Q_ASSERT(t > m_startOffset - DBL_EPSILON && t < m_endOffset + DBL_EPSILON);
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double segmentT;
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if (m_length < DBL_EPSILON) {
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segmentT = 0.5;
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}
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else {
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segmentT = (t - m_startOffset) / m_length;
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}
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double colorT = m_interpolator->valueAt(segmentT, m_middleT);
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Color color = m_colorInterpolator->colorAt(colorT, m_startColor, m_endColor);
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return color;
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}
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bool KisGradientSegment::isValid() const
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{
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if (m_interpolator == 0 || m_colorInterpolator ==0)
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return false;
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return true;
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}
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KisGradientSegment::RGBColorInterpolationStrategy *KisGradientSegment::RGBColorInterpolationStrategy::instance()
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{
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if (m_instance == 0) {
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m_instance = new RGBColorInterpolationStrategy();
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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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Color KisGradientSegment::RGBColorInterpolationStrategy::colorAt(double t, Color start, Color end) const
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{
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int startRed = start.color().red();
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int startGreen = start.color().green();
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int startBlue = start.color().blue();
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double startAlpha = start.alpha();
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int red = static_cast<int>(startRed + t * (end.color().red() - startRed) + 0.5);
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int green = static_cast<int>(startGreen + t * (end.color().green() - startGreen) + 0.5);
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int blue = static_cast<int>(startBlue + t * (end.color().blue() - startBlue) + 0.5);
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double alpha = startAlpha + t * (end.alpha() - startAlpha);
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return Color(TQColor(red, green, blue), alpha);
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}
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KisGradientSegment::HSVCWColorInterpolationStrategy *KisGradientSegment::HSVCWColorInterpolationStrategy::instance()
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{
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if (m_instance == 0) {
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m_instance = new HSVCWColorInterpolationStrategy();
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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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Color KisGradientSegment::HSVCWColorInterpolationStrategy::colorAt(double t, Color start, Color end) const
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{
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KoColor sc = KoColor(start.color());
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KoColor ec = KoColor(end.color());
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int s = static_cast<int>(sc.S() + t * (ec.S() - sc.S()) + 0.5);
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int v = static_cast<int>(sc.V() + t * (ec.V() - sc.V()) + 0.5);
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int h;
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if (ec.H() < sc.H()) {
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h = static_cast<int>(ec.H() + (1 - t) * (sc.H() - ec.H()) + 0.5);
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}
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else {
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h = static_cast<int>(ec.H() + (1 - t) * (360 - ec.H() + sc.H()) + 0.5);
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if (h > 359) {
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h -= 360;
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}
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}
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double alpha = start.alpha() + t * (end.alpha() - start.alpha());
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return Color(KoColor(h, s, v, KoColor::csHSV).color(), alpha);
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}
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KisGradientSegment::HSVCCWColorInterpolationStrategy *KisGradientSegment::HSVCCWColorInterpolationStrategy::instance()
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{
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if (m_instance == 0) {
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m_instance = new HSVCCWColorInterpolationStrategy();
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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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Color KisGradientSegment::HSVCCWColorInterpolationStrategy::colorAt(double t, Color start, Color end) const
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{
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KoColor sc = KoColor(start.color());
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KoColor se = KoColor(end.color());
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int s = static_cast<int>(sc.S() + t * (se.S() - sc.S()) + 0.5);
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int v = static_cast<int>(sc.V() + t * (se.V() - sc.V()) + 0.5);
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int h;
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if (sc.H() < se.H()) {
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h = static_cast<int>(sc.H() + t * (se.H() - sc.H()) + 0.5);
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}
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else {
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h = static_cast<int>(sc.H() + t * (360 - sc.H() + se.H()) + 0.5);
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if (h > 359) {
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h -= 360;
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}
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}
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double alpha = start.alpha() + t * (end.alpha() - start.alpha());
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return Color(KoColor(h, s, v, KoColor::csHSV).color(), alpha);
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}
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KisGradientSegment::LinearInterpolationStrategy *KisGradientSegment::LinearInterpolationStrategy::instance()
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{
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if (m_instance == 0) {
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m_instance = new LinearInterpolationStrategy();
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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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double KisGradientSegment::LinearInterpolationStrategy::calcValueAt(double t, double middle)
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{
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Q_ASSERT(t > -DBL_EPSILON && t < 1 + DBL_EPSILON);
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Q_ASSERT(middle > -DBL_EPSILON && middle < 1 + DBL_EPSILON);
|
|
|
|
double value = 0;
|
|
|
|
if (t <= middle) {
|
|
if (middle < DBL_EPSILON) {
|
|
value = 0;
|
|
}
|
|
else {
|
|
value = (t / middle) * 0.5;
|
|
}
|
|
}
|
|
else {
|
|
if (middle > 1 - DBL_EPSILON) {
|
|
value = 1;
|
|
}
|
|
else {
|
|
value = ((t - middle) / (1 - middle)) * 0.5 + 0.5;
|
|
}
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
double KisGradientSegment::LinearInterpolationStrategy::valueAt(double t, double middle) const
|
|
{
|
|
return calcValueAt(t, middle);
|
|
}
|
|
|
|
KisGradientSegment::CurvedInterpolationStrategy::CurvedInterpolationStrategy()
|
|
{
|
|
m_logHalf = log(0.5);
|
|
}
|
|
|
|
KisGradientSegment::CurvedInterpolationStrategy *KisGradientSegment::CurvedInterpolationStrategy::instance()
|
|
{
|
|
if (m_instance == 0) {
|
|
m_instance = new CurvedInterpolationStrategy();
|
|
Q_CHECK_PTR(m_instance);
|
|
}
|
|
|
|
return m_instance;
|
|
}
|
|
|
|
double KisGradientSegment::CurvedInterpolationStrategy::valueAt(double t, double middle) const
|
|
{
|
|
Q_ASSERT(t > -DBL_EPSILON && t < 1 + DBL_EPSILON);
|
|
Q_ASSERT(middle > -DBL_EPSILON && middle < 1 + DBL_EPSILON);
|
|
|
|
double value = 0;
|
|
|
|
if (middle < DBL_EPSILON) {
|
|
middle = DBL_EPSILON;
|
|
}
|
|
|
|
value = pow(t, m_logHalf / log(middle));
|
|
|
|
return value;
|
|
}
|
|
|
|
KisGradientSegment::SineInterpolationStrategy *KisGradientSegment::SineInterpolationStrategy::instance()
|
|
{
|
|
if (m_instance == 0) {
|
|
m_instance = new SineInterpolationStrategy();
|
|
Q_CHECK_PTR(m_instance);
|
|
}
|
|
|
|
return m_instance;
|
|
}
|
|
|
|
double KisGradientSegment::SineInterpolationStrategy::valueAt(double t, double middle) const
|
|
{
|
|
double lt = LinearInterpolationStrategy::calcValueAt(t, middle);
|
|
double value = (sin(-M_PI_2 + M_PI * lt) + 1.0) / 2.0;
|
|
|
|
return value;
|
|
}
|
|
|
|
KisGradientSegment::SphereIncreasingInterpolationStrategy *KisGradientSegment::SphereIncreasingInterpolationStrategy::instance()
|
|
{
|
|
if (m_instance == 0) {
|
|
m_instance = new SphereIncreasingInterpolationStrategy();
|
|
Q_CHECK_PTR(m_instance);
|
|
}
|
|
|
|
return m_instance;
|
|
}
|
|
|
|
double KisGradientSegment::SphereIncreasingInterpolationStrategy::valueAt(double t, double middle) const
|
|
{
|
|
double lt = LinearInterpolationStrategy::calcValueAt(t, middle) - 1;
|
|
double value = sqrt(1 - lt * lt);
|
|
|
|
return value;
|
|
}
|
|
|
|
KisGradientSegment::SphereDecreasingInterpolationStrategy *KisGradientSegment::SphereDecreasingInterpolationStrategy::instance()
|
|
{
|
|
if (m_instance == 0) {
|
|
m_instance = new SphereDecreasingInterpolationStrategy();
|
|
Q_CHECK_PTR(m_instance);
|
|
}
|
|
|
|
return m_instance;
|
|
}
|
|
|
|
double KisGradientSegment::SphereDecreasingInterpolationStrategy::valueAt(double t, double middle) const
|
|
{
|
|
double lt = LinearInterpolationStrategy::calcValueAt(t, middle);
|
|
double value = 1 - sqrt(1 - lt * lt);
|
|
|
|
return value;
|
|
}
|
|
|
|
#include "kis_gradient.moc"
|
|
|