1 /* This file is part of the KDE project
2 * Copyright (C) 2010 Carlos Licea <carlos@kdab.com>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB. If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20 #include "MonoFilterEffect.h"
21 #include <KoFilterEffectRenderContext.h>
22
23 #include <QImage>
24
MonoFilterEffect()25 MonoFilterEffect::MonoFilterEffect()
26 : KoFilterEffect(MonoFilterEffectId, "Mono Effect")
27 {
28 }
29
~MonoFilterEffect()30 MonoFilterEffect::~MonoFilterEffect()
31 {
32 }
33
save(KoXmlWriter &)34 void MonoFilterEffect::save(KoXmlWriter& /*writer*/)
35 {
36 }
37
load(const KoXmlElement &,const KoFilterEffectLoadingContext &)38 bool MonoFilterEffect::load(const KoXmlElement& /*element*/, const KoFilterEffectLoadingContext& /*context*/)
39 {
40 return true;
41 }
42
processImage(const QImage & image,const KoFilterEffectRenderContext & context) const43 QImage MonoFilterEffect::processImage(const QImage& image, const KoFilterEffectRenderContext& context) const
44 {
45 QImage result = image.convertToFormat(QImage::Format_ARGB32);
46 QRgb* pixel = reinterpret_cast<QRgb*>( result.bits() );
47 const int right = context.filterRegion().right();
48 const int bottom = context.filterRegion().bottom();
49 const int width = result.width();
50 for( int row = context.filterRegion().top(); row < bottom; ++row ) {
51 for( int col = context.filterRegion().left(); col < right; ++col ){
52 const QRgb currentPixel = pixel[row * width + col];
53 const int red = qRed(currentPixel);
54 const int green = qGreen(currentPixel);
55 const int blue = qBlue(currentPixel);
56 const int alpha = qAlpha(currentPixel);
57 const int monoValue = ( (red * 11 + green * 16 + blue * 5) / 32 ) / 127 * 255;
58 pixel[row * width + col] = qRgba(monoValue, monoValue, monoValue, alpha);
59 }
60 }
61 return result;
62 }
63
64