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Diffstat (limited to 'chalk/core/kis_gradient.cpp')
| -rw-r--r-- | chalk/core/kis_gradient.cpp | 639 |
1 files changed, 639 insertions, 0 deletions
diff --git a/chalk/core/kis_gradient.cpp b/chalk/core/kis_gradient.cpp new file mode 100644 index 000000000..9b240cb06 --- /dev/null +++ b/chalk/core/kis_gradient.cpp @@ -0,0 +1,639 @@ +/* + * kis_gradient.cpp - part of Krayon + * + * Copyright (c) 2000 Matthias Elter <elter@kde.org> + * 2001 John Califf + * 2004 Boudewijn Rempt <boud@valdyas.org> + * 2004 Adrian Page <adrian@pagenet.plus.com> + * 2004 Sven Langkamp <longamp@reallygood.de> + * + * 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 <cfloat> +#include <cmath> + +#include <tqimage.h> +#include <tqtextstream.h> +#include <tqfile.h> + +#include <koColor.h> +#include <kogradientmanager.h> + +#include <kdebug.h> +#include <tdelocale.h> + +#include "kis_gradient.h" + +#define PREVIEW_WIDTH 64 +#define PREVIEW_HEIGHT 64 + +KisGradientSegment::RGBColorInterpolationStrategy *KisGradientSegment::RGBColorInterpolationStrategy::m_instance = 0; +KisGradientSegment::HSVCWColorInterpolationStrategy *KisGradientSegment::HSVCWColorInterpolationStrategy::m_instance = 0; +KisGradientSegment::HSVCCWColorInterpolationStrategy *KisGradientSegment::HSVCCWColorInterpolationStrategy::m_instance = 0; + +KisGradientSegment::LinearInterpolationStrategy *KisGradientSegment::LinearInterpolationStrategy::m_instance = 0; +KisGradientSegment::CurvedInterpolationStrategy *KisGradientSegment::CurvedInterpolationStrategy::m_instance = 0; +KisGradientSegment::SineInterpolationStrategy *KisGradientSegment::SineInterpolationStrategy::m_instance = 0; +KisGradientSegment::SphereIncreasingInterpolationStrategy *KisGradientSegment::SphereIncreasingInterpolationStrategy::m_instance = 0; +KisGradientSegment::SphereDecreasingInterpolationStrategy *KisGradientSegment::SphereDecreasingInterpolationStrategy::m_instance = 0; + +KisGradient::KisGradient(const TQString& file) : super(file) +{ +} + +KisGradient::~KisGradient() +{ + for (uint i = 0; i < m_segments.count(); i++) { + delete m_segments[i]; + m_segments[i] = 0; + } +} + +bool KisGradient::load() +{ + return init(); +} + +bool KisGradient::save() +{ + return false; +} + +TQImage KisGradient::img() +{ + return m_img; +} + +bool KisGradient::init() +{ + KoGradientManager gradLoader; + KoGradient* grad = gradLoader.loadGradient(filename()); + + if( !grad ) + return false; + + m_segments.clear(); + + if( grad->colorStops.count() > 1 ) { + KoColorStop *colstop; + for(colstop = grad->colorStops.first(); colstop; colstop = grad->colorStops.next()) { + KoColorStop *colstopNext = grad->colorStops.next(); + + if(colstopNext) { + KoColor leftRgb((int)(colstop->color1 * 255 + 0.5), (int)(colstop->color2 * 255 + 0.5), (int)(colstop->color3 * 255 + 0.5)); + KoColor rightRgb((int)(colstopNext->color1 * 255 + 0.5), (int)(colstopNext->color2 * 255 + 0.5), (int)(colstopNext->color3 * 255 + 0.5)); + + double midp = colstop->midpoint; + midp = colstop->offset + ((colstopNext->offset - colstop->offset) * midp); + + Color leftColor(leftRgb.color(), colstop->opacity); + Color rightColor(rightRgb.color(), colstopNext->opacity); + + KisGradientSegment *segment = new KisGradientSegment(colstop->interpolation, colstop->colorType, colstop->offset, midp, colstopNext->offset, leftColor, rightColor); + TQ_CHECK_PTR(segment); + + if ( !segment->isValid() ) { + delete segment; + return false; + } + + m_segments.push_back(segment); + grad->colorStops.prev(); + } + else { + grad->colorStops.prev(); + break; + } + } + } + else + return false; + + if (!m_segments.isEmpty()) { + m_img = generatePreview(PREVIEW_WIDTH, PREVIEW_HEIGHT); + setValid(true); + return true; + } + else { + return false; + } +} + +void KisGradient::setImage(const TQImage& img) +{ + m_img = img; + m_img.detach(); + + setValid(true); +} + +KisGradientSegment *KisGradient::segmentAt(double t) const +{ + Q_ASSERT(t >= 0 || t <= 1); + Q_ASSERT(!m_segments.empty()); + + for(TQValueVector<KisGradientSegment *>::const_iterator it = m_segments.begin(); it!= m_segments.end(); ++it) + { + if (t > (*it)->startOffset() - DBL_EPSILON && t < (*it)->endOffset() + DBL_EPSILON) { + return *it; + } + } + + return 0; +} + +void KisGradient::colorAt(double t, TQColor *color, TQ_UINT8 *opacity) const +{ + const KisGradientSegment *segment = segmentAt(t); + Q_ASSERT(segment != 0); + + if (segment) { + Color col = segment->colorAt(t); + *color = col.color(); + *opacity = static_cast<TQ_UINT8>(col.alpha() * OPACITY_OPAQUE + 0.5); + } +} + +TQImage KisGradient::generatePreview(int width, int height) const +{ + TQImage img(width, height, 32); + + for (int y = 0; y < img.height(); y++) { + for (int x = 0; x < img.width(); x++) { + + int backgroundRed = 128 + 63 * ((x / 4 + y / 4) % 2); + int backgroundGreen = backgroundRed; + int backgroundBlue = backgroundRed; + + TQColor color; + TQ_UINT8 opacity; + double t = static_cast<double>(x) / (img.width() - 1); + + colorAt(t, &color, &opacity); + + double alpha = static_cast<double>(opacity) / OPACITY_OPAQUE; + + int red = static_cast<int>((1 - alpha) * backgroundRed + alpha * color.red() + 0.5); + int green = static_cast<int>((1 - alpha) * backgroundGreen + alpha * color.green() + 0.5); + int blue = static_cast<int>((1 - alpha) * backgroundBlue + alpha * color.blue() + 0.5); + + img.setPixel(x, y, tqRgb(red, green, blue)); + } + } + + return img; +} + +KisGradientSegment::KisGradientSegment(int interpolationType, int colorInterpolationType, double startOffset, double middleOffset, double endOffset, const Color& startColor, const Color& endColor) +{ + m_interpolator = 0; + + switch (interpolationType) { + case INTERP_LINEAR: + m_interpolator = LinearInterpolationStrategy::instance(); + break; + case INTERP_CURVED: + m_interpolator = CurvedInterpolationStrategy::instance(); + break; + case INTERP_SINE: + m_interpolator = SineInterpolationStrategy::instance(); + break; + case INTERP_SPHERE_INCREASING: + m_interpolator = SphereIncreasingInterpolationStrategy::instance(); + break; + case INTERP_SPHERE_DECREASING: + m_interpolator = SphereDecreasingInterpolationStrategy::instance(); + break; + } + + m_colorInterpolator = 0; + + switch (colorInterpolationType) { + case COLOR_INTERP_RGB: + m_colorInterpolator = RGBColorInterpolationStrategy::instance(); + break; + case COLOR_INTERP_HSV_CCW: + m_colorInterpolator = HSVCCWColorInterpolationStrategy::instance(); + break; + case COLOR_INTERP_HSV_CW: + m_colorInterpolator = HSVCWColorInterpolationStrategy::instance(); + break; + } + + if (startOffset < DBL_EPSILON) { + m_startOffset = 0; + } + else + if (startOffset > 1 - DBL_EPSILON) { + m_startOffset = 1; + } + else { + m_startOffset = startOffset; + } + + if (middleOffset < m_startOffset + DBL_EPSILON) { + m_middleOffset = m_startOffset; + } + else + if (middleOffset > 1 - DBL_EPSILON) { + m_middleOffset = 1; + } + else { + m_middleOffset = middleOffset; + } + + if (endOffset < m_middleOffset + DBL_EPSILON) { + m_endOffset = m_middleOffset; + } + else + if (endOffset > 1 - DBL_EPSILON) { + m_endOffset = 1; + } + else { + m_endOffset = endOffset; + } + + m_length = m_endOffset - m_startOffset; + + if (m_length < DBL_EPSILON) { + m_middleT = 0.5; + } + else { + m_middleT = (m_middleOffset - m_startOffset) / m_length; + } + + m_startColor = startColor; + m_endColor = endColor; +} + +const Color& KisGradientSegment::startColor() const +{ + return m_startColor; +} + +const Color& KisGradientSegment::endColor() const +{ + return m_endColor; +} + +double KisGradientSegment::startOffset() const +{ + return m_startOffset; +} + +double KisGradientSegment::middleOffset() const +{ + return m_middleOffset; +} + +double KisGradientSegment::endOffset() const +{ + return m_endOffset; +} + +void KisGradientSegment::setStartOffset(double t) +{ + m_startOffset = t; + m_length = m_endOffset - m_startOffset; + + if (m_length < DBL_EPSILON) { + m_middleT = 0.5; + } + else { + m_middleT = (m_middleOffset - m_startOffset) / m_length; + } +} +void KisGradientSegment::setMiddleOffset(double t) +{ + m_middleOffset = t; + + if (m_length < DBL_EPSILON) { + m_middleT = 0.5; + } + else { + m_middleT = (m_middleOffset - m_startOffset) / m_length; + } +} + +void KisGradientSegment::setEndOffset(double t) +{ + m_endOffset = t; + m_length = m_endOffset - m_startOffset; + + if (m_length < DBL_EPSILON) { + m_middleT = 0.5; + } + else { + m_middleT = (m_middleOffset - m_startOffset) / m_length; + } +} + +int KisGradientSegment::interpolation() const +{ + return m_interpolator->type(); +} + +void KisGradientSegment::setInterpolation(int interpolationType) +{ + switch (interpolationType) { + case INTERP_LINEAR: + m_interpolator = LinearInterpolationStrategy::instance(); + break; + case INTERP_CURVED: + m_interpolator = CurvedInterpolationStrategy::instance(); + break; + case INTERP_SINE: + m_interpolator = SineInterpolationStrategy::instance(); + break; + case INTERP_SPHERE_INCREASING: + m_interpolator = SphereIncreasingInterpolationStrategy::instance(); + break; + case INTERP_SPHERE_DECREASING: + m_interpolator = SphereDecreasingInterpolationStrategy::instance(); + break; + } +} + +int KisGradientSegment::colorInterpolation() const +{ + return m_colorInterpolator->type(); +} + +void KisGradientSegment::setColorInterpolation(int colorInterpolationType) +{ + switch (colorInterpolationType) { + case COLOR_INTERP_RGB: + m_colorInterpolator = RGBColorInterpolationStrategy::instance(); + break; + case COLOR_INTERP_HSV_CCW: + m_colorInterpolator = HSVCCWColorInterpolationStrategy::instance(); + break; + case COLOR_INTERP_HSV_CW: + m_colorInterpolator = HSVCWColorInterpolationStrategy::instance(); + break; + } +} + +Color KisGradientSegment::colorAt(double t) const +{ + Q_ASSERT(t > m_startOffset - DBL_EPSILON && t < m_endOffset + DBL_EPSILON); + + double segmentT; + + if (m_length < DBL_EPSILON) { + segmentT = 0.5; + } + else { + segmentT = (t - m_startOffset) / m_length; + } + + double colorT = m_interpolator->valueAt(segmentT, m_middleT); + + Color color = m_colorInterpolator->colorAt(colorT, m_startColor, m_endColor); + + return color; +} + +bool KisGradientSegment::isValid() const +{ + if (m_interpolator == 0 || m_colorInterpolator ==0) + return false; + return true; +} + +KisGradientSegment::RGBColorInterpolationStrategy *KisGradientSegment::RGBColorInterpolationStrategy::instance() +{ + if (m_instance == 0) { + m_instance = new RGBColorInterpolationStrategy(); + TQ_CHECK_PTR(m_instance); + } + + return m_instance; +} + +Color KisGradientSegment::RGBColorInterpolationStrategy::colorAt(double t, Color start, Color end) const +{ + int startRed = start.color().red(); + int startGreen = start.color().green(); + int startBlue = start.color().blue(); + double startAlpha = start.alpha(); + int red = static_cast<int>(startRed + t * (end.color().red() - startRed) + 0.5); + int green = static_cast<int>(startGreen + t * (end.color().green() - startGreen) + 0.5); + int blue = static_cast<int>(startBlue + t * (end.color().blue() - startBlue) + 0.5); + double alpha = startAlpha + t * (end.alpha() - startAlpha); + + return Color(TQColor(red, green, blue), alpha); +} + +KisGradientSegment::HSVCWColorInterpolationStrategy *KisGradientSegment::HSVCWColorInterpolationStrategy::instance() +{ + if (m_instance == 0) { + m_instance = new HSVCWColorInterpolationStrategy(); + TQ_CHECK_PTR(m_instance); + } + + return m_instance; +} + +Color KisGradientSegment::HSVCWColorInterpolationStrategy::colorAt(double t, Color start, Color end) const +{ + KoColor sc = KoColor(start.color()); + KoColor ec = KoColor(end.color()); + + int s = static_cast<int>(sc.S() + t * (ec.S() - sc.S()) + 0.5); + int v = static_cast<int>(sc.V() + t * (ec.V() - sc.V()) + 0.5); + int h; + + if (ec.H() < sc.H()) { + h = static_cast<int>(ec.H() + (1 - t) * (sc.H() - ec.H()) + 0.5); + } + else { + h = static_cast<int>(ec.H() + (1 - t) * (360 - ec.H() + sc.H()) + 0.5); + + if (h > 359) { + h -= 360; + } + } + + double alpha = start.alpha() + t * (end.alpha() - start.alpha()); + + return Color(KoColor(h, s, v, KoColor::csHSV).color(), alpha); +} + +KisGradientSegment::HSVCCWColorInterpolationStrategy *KisGradientSegment::HSVCCWColorInterpolationStrategy::instance() +{ + if (m_instance == 0) { + m_instance = new HSVCCWColorInterpolationStrategy(); + TQ_CHECK_PTR(m_instance); + } + + return m_instance; +} + +Color KisGradientSegment::HSVCCWColorInterpolationStrategy::colorAt(double t, Color start, Color end) const +{ + KoColor sc = KoColor(start.color()); + KoColor se = KoColor(end.color()); + + int s = static_cast<int>(sc.S() + t * (se.S() - sc.S()) + 0.5); + int v = static_cast<int>(sc.V() + t * (se.V() - sc.V()) + 0.5); + int h; + + if (sc.H() < se.H()) { + h = static_cast<int>(sc.H() + t * (se.H() - sc.H()) + 0.5); + } + else { + h = static_cast<int>(sc.H() + t * (360 - sc.H() + se.H()) + 0.5); + + if (h > 359) { + h -= 360; + } + } + + double alpha = start.alpha() + t * (end.alpha() - start.alpha()); + + return Color(KoColor(h, s, v, KoColor::csHSV).color(), alpha); +} + +KisGradientSegment::LinearInterpolationStrategy *KisGradientSegment::LinearInterpolationStrategy::instance() +{ + if (m_instance == 0) { + m_instance = new LinearInterpolationStrategy(); + TQ_CHECK_PTR(m_instance); + } + + return m_instance; +} + +double KisGradientSegment::LinearInterpolationStrategy::calcValueAt(double t, double middle) +{ + Q_ASSERT(t > -DBL_EPSILON && t < 1 + DBL_EPSILON); + 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(); + TQ_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(); + TQ_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(); + TQ_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(); + TQ_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" + |