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/* This file is part of the KDE project
* Copyright (c) 2009 Jan Hambrecht <jaham@gmx.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "BlendEffect.h"
#include "ColorChannelConversion.h"
#include <KoFilterEffectRenderContext.h>
#include <KoXmlWriter.h>
#include <KoXmlReader.h>
#include <klocalizedstring.h>
#include <QRect>
#include <QImage>
#include <math.h>
BlendEffect::BlendEffect()
: KoFilterEffect(BlendEffectId, i18n("Blend"))
, m_blendMode(Normal)
{
setRequiredInputCount(2);
setMaximalInputCount(2);
}
BlendEffect::BlendMode BlendEffect::blendMode() const
{
return m_blendMode;
}
void BlendEffect::setBlendMode(BlendMode blendMode)
{
m_blendMode = blendMode;
}
QImage BlendEffect::processImage(const QImage &image, const KoFilterEffectRenderContext &context) const
{
Q_UNUSED(context);
return image;
}
QImage BlendEffect::processImages(const QVector<QImage> &images, const KoFilterEffectRenderContext &context) const
{
int imageCount = images.count();
if (!imageCount)
return QImage();
QImage result = images[0];
if (images.count() != 2) {
return result;
}
const QRgb *src = (const QRgb*)images[1].constBits();
QRgb *dst = (QRgb*)result.bits();
int w = result.width();
qreal sa, sr, sg, sb;
qreal da, dr, dg, db;
int pixel = 0;
QRect roi = context.filterRegion().toRect();
for (int row = roi.top(); row < roi.bottom(); ++row) {
for (int col = roi.left(); col < roi.right(); ++col) {
pixel = row * w + col;
const QRgb &s = src[pixel];
QRgb &d = dst[pixel];
sa = fromIntColor[qAlpha(s)];
sr = fromIntColor[qRed(s)];
sg = fromIntColor[qGreen(s)];
sb = fromIntColor[qBlue(s)];
da = fromIntColor[qAlpha(d)];
dr = fromIntColor[qRed(d)];
dg = fromIntColor[qGreen(d)];
db = fromIntColor[qBlue(d)];
switch (m_blendMode) {
case Normal:
dr = (qreal(1.0) - da) * sr + dr;
dg = (qreal(1.0) - da) * sg + dg;
db = (qreal(1.0) - da) * sb + db;
break;
case Multiply:
dr = (qreal(1.0) - da) * sr + (qreal(1.0) - sa) * dr + dr * sr;
dg = (qreal(1.0) - da) * sg + (qreal(1.0) - sa) * dg + dg * sg;
db = (qreal(1.0) - da) * sb + (qreal(1.0) - sa) * db + db * sb;
break;
case Screen:
dr = sr + dr - dr * sr;
dg = sg + dg - dg * sg;
db = sb + db - db * sb;
break;
case Darken:
dr = qMin((qreal(1.0) - da) * sr + dr, (qreal(1.0) - sa) * dr + sr);
dg = qMin((qreal(1.0) - da) * sg + dg, (qreal(1.0) - sa) * dg + sg);
db = qMin((qreal(1.0) - da) * sb + db, (qreal(1.0) - sa) * db + sb);
break;
case Lighten:
dr = qMax((qreal(1.0) - da) * sr + dr, (qreal(1.0) - sa) * dr + sr);
dg = qMax((qreal(1.0) - da) * sg + dg, (qreal(1.0) - sa) * dg + sg);
db = qMax((qreal(1.0) - da) * sb + db, (qreal(1.0) - sa) * db + sb);
break;
}
da = qreal(1.0) - (qreal(1.0) - da) * (qreal(1.0) - sa);
d = qRgba(static_cast<quint8>(qBound(qreal(0.0), dr * qreal(255.0), qreal(255.0))),
static_cast<quint8>(qBound(qreal(0.0), dg * qreal(255.0), qreal(255.0))),
static_cast<quint8>(qBound(qreal(0.0), db * qreal(255.0), qreal(255.0))),
static_cast<quint8>(qBound(qreal(0.0), da * qreal(255.0), qreal(255.0))));
}
}
return result;
}
bool BlendEffect::load(const KoXmlElement &element, const KoFilterEffectLoadingContext &)
{
if (element.tagName() != id())
return false;
m_blendMode = Normal; // default blend mode
QString modeStr = element.attribute("mode");
if (!modeStr.isEmpty()) {
if (modeStr == "multiply")
m_blendMode = Multiply;
else if (modeStr == "screen")
m_blendMode = Screen;
else if (modeStr == "darken")
m_blendMode = Darken;
else if (modeStr == "lighten")
m_blendMode = Lighten;
}
if (element.hasAttribute("in2")) {
if (inputs().count() == 2)
setInput(1, element.attribute("in2"));
else
addInput(element.attribute("in2"));
}
return true;
}
void BlendEffect::save(KoXmlWriter &writer)
{
writer.startElement(BlendEffectId);
saveCommonAttributes(writer);
switch (m_blendMode) {
case Normal:
writer.addAttribute("mode", "normal");
break;
case Multiply:
writer.addAttribute("mode", "multiply");
break;
case Screen:
writer.addAttribute("mode", "screen");
break;
case Darken:
writer.addAttribute("mode", "darken");
break;
case Lighten:
writer.addAttribute("mode", "lighten");
break;
}
writer.addAttribute("in2", inputs().at(1));
writer.endElement();
}
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