diff options
Diffstat (limited to 'WebCore/svg/graphics/filters/SVGFEDisplacementMap.cpp')
| -rw-r--r-- | WebCore/svg/graphics/filters/SVGFEDisplacementMap.cpp | 54 |
1 files changed, 52 insertions, 2 deletions
diff --git a/WebCore/svg/graphics/filters/SVGFEDisplacementMap.cpp b/WebCore/svg/graphics/filters/SVGFEDisplacementMap.cpp index abb57ee..a22bc94 100644 --- a/WebCore/svg/graphics/filters/SVGFEDisplacementMap.cpp +++ b/WebCore/svg/graphics/filters/SVGFEDisplacementMap.cpp @@ -2,6 +2,7 @@ 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 @@ -23,8 +24,12 @@ #if ENABLE(SVG) && ENABLE(FILTERS) #include "SVGFEDisplacementMap.h" -#include "SVGRenderTreeAsText.h" + +#include "CanvasPixelArray.h" #include "Filter.h" +#include "GraphicsContext.h" +#include "ImageData.h" +#include "SVGRenderTreeAsText.h" namespace WebCore { @@ -75,8 +80,53 @@ void FEDisplacementMap::setScale(float scale) m_scale = scale; } -void FEDisplacementMap::apply(Filter*) +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() |