| /* |
| Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org> |
| 2004, 2005 Rob Buis <buis@kde.org> |
| 2005 Eric Seidel <eric@webkit.org> |
| 2009 Dirk Schulze <krit@webkit.org> |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public |
| License as published by the Free Software Foundation; either |
| version 2 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 Library General Public License |
| aint 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 "config.h" |
| |
| #if ENABLE(SVG) && ENABLE(FILTERS) |
| #include "SVGFEDisplacementMap.h" |
| |
| #include "CanvasPixelArray.h" |
| #include "Filter.h" |
| #include "GraphicsContext.h" |
| #include "ImageData.h" |
| #include "SVGRenderTreeAsText.h" |
| |
| namespace WebCore { |
| |
| FEDisplacementMap::FEDisplacementMap(FilterEffect* in, FilterEffect* in2, ChannelSelectorType xChannelSelector, |
| ChannelSelectorType yChannelSelector, const float& scale) |
| : FilterEffect() |
| , m_in(in) |
| , m_in2(in2) |
| , m_xChannelSelector(xChannelSelector) |
| , m_yChannelSelector(yChannelSelector) |
| , m_scale(scale) |
| { |
| } |
| |
| PassRefPtr<FEDisplacementMap> FEDisplacementMap::create(FilterEffect* in, FilterEffect* in2, |
| ChannelSelectorType xChannelSelector, ChannelSelectorType yChannelSelector, const float& scale) |
| { |
| return adoptRef(new FEDisplacementMap(in, in2, xChannelSelector, yChannelSelector, scale)); |
| } |
| |
| ChannelSelectorType FEDisplacementMap::xChannelSelector() const |
| { |
| return m_xChannelSelector; |
| } |
| |
| void FEDisplacementMap::setXChannelSelector(const ChannelSelectorType xChannelSelector) |
| { |
| m_xChannelSelector = xChannelSelector; |
| } |
| |
| ChannelSelectorType FEDisplacementMap::yChannelSelector() const |
| { |
| return m_yChannelSelector; |
| } |
| |
| void FEDisplacementMap::setYChannelSelector(const ChannelSelectorType yChannelSelector) |
| { |
| m_yChannelSelector = yChannelSelector; |
| } |
| |
| float FEDisplacementMap::scale() const |
| { |
| return m_scale; |
| } |
| |
| void FEDisplacementMap::setScale(float scale) |
| { |
| m_scale = scale; |
| } |
| |
| void FEDisplacementMap::apply(Filter* filter) |
| { |
| m_in->apply(filter); |
| m_in2->apply(filter); |
| if (!m_in->resultImage() || !m_in2->resultImage()) |
| return; |
| |
| if (m_xChannelSelector == CHANNEL_UNKNOWN || m_yChannelSelector == CHANNEL_UNKNOWN) |
| return; |
| |
| if (!getEffectContext()) |
| return; |
| |
| IntRect effectADrawingRect = calculateDrawingIntRect(m_in->scaledSubRegion()); |
| RefPtr<CanvasPixelArray> srcPixelArrayA(m_in->resultImage()->getPremultipliedImageData(effectADrawingRect)->data()); |
| |
| IntRect effectBDrawingRect = calculateDrawingIntRect(m_in2->scaledSubRegion()); |
| RefPtr<CanvasPixelArray> srcPixelArrayB(m_in2->resultImage()->getUnmultipliedImageData(effectBDrawingRect)->data()); |
| |
| IntRect imageRect(IntPoint(), resultImage()->size()); |
| RefPtr<ImageData> imageData = ImageData::create(imageRect.width(), imageRect.height()); |
| |
| ASSERT(srcPixelArrayA->length() == srcPixelArrayB->length()); |
| |
| float scaleX = m_scale / 255.f * filter->filterResolution().width(); |
| float scaleY = m_scale / 255.f * filter->filterResolution().height(); |
| float scaleAdjustmentX = (0.5f - 0.5f * m_scale) * filter->filterResolution().width(); |
| float scaleAdjustmentY = (0.5f - 0.5f * m_scale) * filter->filterResolution().height(); |
| int stride = imageRect.width() * 4; |
| for (int y = 0; y < imageRect.height(); ++y) { |
| int line = y * stride; |
| for (int x = 0; x < imageRect.width(); ++x) { |
| int dstIndex = line + x * 4; |
| int srcX = x + static_cast<int>(scaleX * srcPixelArrayB->get(dstIndex + m_xChannelSelector - 1) + scaleAdjustmentX); |
| int srcY = y + static_cast<int>(scaleY * srcPixelArrayB->get(dstIndex + m_yChannelSelector - 1) + scaleAdjustmentY); |
| for (unsigned channel = 0; channel < 4; ++channel) { |
| if (srcX < 0 || srcX >= imageRect.width() || srcY < 0 || srcY >= imageRect.height()) |
| imageData->data()->set(dstIndex + channel, static_cast<unsigned char>(0)); |
| else { |
| unsigned char pixelValue = srcPixelArrayA->get(srcY * stride + srcX * 4 + channel); |
| imageData->data()->set(dstIndex + channel, pixelValue); |
| } |
| } |
| |
| } |
| } |
| resultImage()->putPremultipliedImageData(imageData.get(), imageRect, IntPoint()); |
| } |
| |
| void FEDisplacementMap::dump() |
| { |
| } |
| |
| static TextStream& operator<<(TextStream& ts, ChannelSelectorType t) |
| { |
| switch (t) |
| { |
| case CHANNEL_UNKNOWN: |
| ts << "UNKNOWN"; break; |
| case CHANNEL_R: |
| ts << "RED"; break; |
| case CHANNEL_G: |
| ts << "GREEN"; break; |
| case CHANNEL_B: |
| ts << "BLUE"; break; |
| case CHANNEL_A: |
| ts << "ALPHA"; break; |
| } |
| return ts; |
| } |
| |
| TextStream& FEDisplacementMap::externalRepresentation(TextStream& ts) const |
| { |
| ts << "[type=DISPLACEMENT-MAP] "; |
| FilterEffect::externalRepresentation(ts); |
| ts << " [in2=" << m_in2.get() << "]" |
| << " [scale=" << m_scale << "]" |
| << " [x channel selector=" << m_xChannelSelector << "]" |
| << " [y channel selector=" << m_yChannelSelector << "]"; |
| return ts; |
| } |
| |
| } // namespace WebCore |
| |
| #endif // ENABLE(SVG) && ENABLE(FILTERS) |