2 * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
4 * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
5 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
6 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public License
19 * along with this library; see the file COPYING.LIB. If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
27 #include "FEDisplacementMap.h"
30 #include "GraphicsContext.h"
31 #include "RenderTreeAsText.h"
32 #include "TextStream.h"
34 #include <wtf/ByteArray.h>
38 FEDisplacementMap::FEDisplacementMap(Filter* filter, ChannelSelectorType xChannelSelector, ChannelSelectorType yChannelSelector, float scale)
39 : FilterEffect(filter)
40 , m_xChannelSelector(xChannelSelector)
41 , m_yChannelSelector(yChannelSelector)
46 PassRefPtr<FEDisplacementMap> FEDisplacementMap::create(Filter* filter, ChannelSelectorType xChannelSelector,
47 ChannelSelectorType yChannelSelector, float scale)
49 return adoptRef(new FEDisplacementMap(filter, xChannelSelector, yChannelSelector, scale));
52 ChannelSelectorType FEDisplacementMap::xChannelSelector() const
54 return m_xChannelSelector;
57 bool FEDisplacementMap::setXChannelSelector(const ChannelSelectorType xChannelSelector)
59 if (m_xChannelSelector == xChannelSelector)
61 m_xChannelSelector = xChannelSelector;
65 ChannelSelectorType FEDisplacementMap::yChannelSelector() const
67 return m_yChannelSelector;
70 bool FEDisplacementMap::setYChannelSelector(const ChannelSelectorType yChannelSelector)
72 if (m_yChannelSelector == yChannelSelector)
74 m_yChannelSelector = yChannelSelector;
78 float FEDisplacementMap::scale() const
83 bool FEDisplacementMap::setScale(float scale)
91 void FEDisplacementMap::platformApplySoftware()
93 FilterEffect* in = inputEffect(0);
94 FilterEffect* in2 = inputEffect(1);
96 ASSERT(m_xChannelSelector != CHANNEL_UNKNOWN);
97 ASSERT(m_yChannelSelector != CHANNEL_UNKNOWN);
99 ByteArray* dstPixelArray = createPremultipliedImageResult();
103 IntRect effectADrawingRect = requestedRegionOfInputImageData(in->absolutePaintRect());
104 RefPtr<ByteArray> srcPixelArrayA = in->asPremultipliedImage(effectADrawingRect);
106 IntRect effectBDrawingRect = requestedRegionOfInputImageData(in2->absolutePaintRect());
107 RefPtr<ByteArray> srcPixelArrayB = in2->asUnmultipliedImage(effectBDrawingRect);
109 ASSERT(srcPixelArrayA->length() == srcPixelArrayB->length());
111 Filter* filter = this->filter();
112 IntSize paintSize = absolutePaintRect().size();
113 float scaleX = filter->applyHorizontalScale(m_scale / 255);
114 float scaleY = filter->applyVerticalScale(m_scale / 255);
115 float scaleAdjustmentX = filter->applyHorizontalScale(0.5f - 0.5f * m_scale);
116 float scaleAdjustmentY = filter->applyVerticalScale(0.5f - 0.5f * m_scale);
117 int stride = paintSize.width() * 4;
118 for (int y = 0; y < paintSize.height(); ++y) {
119 int line = y * stride;
120 for (int x = 0; x < paintSize.width(); ++x) {
121 int dstIndex = line + x * 4;
122 int srcX = x + static_cast<int>(scaleX * srcPixelArrayB->get(dstIndex + m_xChannelSelector - 1) + scaleAdjustmentX);
123 int srcY = y + static_cast<int>(scaleY * srcPixelArrayB->get(dstIndex + m_yChannelSelector - 1) + scaleAdjustmentY);
124 for (unsigned channel = 0; channel < 4; ++channel) {
125 if (srcX < 0 || srcX >= paintSize.width() || srcY < 0 || srcY >= paintSize.height())
126 dstPixelArray->set(dstIndex + channel, static_cast<unsigned char>(0));
128 unsigned char pixelValue = srcPixelArrayA->get(srcY * stride + srcX * 4 + channel);
129 dstPixelArray->set(dstIndex + channel, pixelValue);
136 void FEDisplacementMap::dump()
140 static TextStream& operator<<(TextStream& ts, const ChannelSelectorType& type)
143 case CHANNEL_UNKNOWN:
162 TextStream& FEDisplacementMap::externalRepresentation(TextStream& ts, int indent) const
164 writeIndent(ts, indent);
165 ts << "[feDisplacementMap";
166 FilterEffect::externalRepresentation(ts);
167 ts << " scale=\"" << m_scale << "\" "
168 << "xChannelSelector=\"" << m_xChannelSelector << "\" "
169 << "yChannelSelector=\"" << m_yChannelSelector << "\"]\n";
170 inputEffect(0)->externalRepresentation(ts, indent + 1);
171 inputEffect(1)->externalRepresentation(ts, indent + 1);
175 } // namespace WebCore
177 #endif // ENABLE(FILTERS)