127 lines
4.8 KiB
C++
127 lines
4.8 KiB
C++
/*
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* Copyright (C) 2011 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "CrossfadeGeneratedImage.h"
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#include "FloatRect.h"
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#include "GraphicsContext.h"
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#include "ImageBuffer.h"
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#include <wtf/text/TextStream.h>
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namespace WebCore {
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CrossfadeGeneratedImage::CrossfadeGeneratedImage(Image& fromImage, Image& toImage, float percentage, const FloatSize& crossfadeSize, const FloatSize& size)
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: m_fromImage(fromImage)
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, m_toImage(toImage)
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, m_percentage(percentage)
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, m_crossfadeSize(crossfadeSize)
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{
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setContainerSize(size);
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}
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static void drawCrossfadeSubimage(GraphicsContext& context, Image& image, CompositeOperator operation, float opacity, const FloatSize& targetSize)
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{
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FloatSize imageSize = image.size();
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// SVGImage resets the opacity when painting, so we have to use transparency layers to accurately paint one at a given opacity.
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bool useTransparencyLayer = image.drawsSVGImage();
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GraphicsContextStateSaver stateSaver(context);
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ImagePaintingOptions options;
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if (useTransparencyLayer) {
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context.setCompositeOperation(operation);
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context.beginTransparencyLayer(opacity);
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} else {
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context.setAlpha(opacity);
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options = { operation };
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}
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if (targetSize != imageSize)
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context.scale(targetSize / imageSize);
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context.drawImage(image, IntPoint(), options);
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if (useTransparencyLayer)
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context.endTransparencyLayer();
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}
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void CrossfadeGeneratedImage::drawCrossfade(GraphicsContext& context)
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{
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// Draw nothing if either of the images hasn't loaded yet.
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if (m_fromImage.ptr() == &Image::nullImage() || m_toImage.ptr() == &Image::nullImage())
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return;
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GraphicsContextStateSaver stateSaver(context);
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context.clip(FloatRect(FloatPoint(), m_crossfadeSize));
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context.beginTransparencyLayer(1);
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drawCrossfadeSubimage(context, m_fromImage.get(), CompositeOperator::SourceOver, 1 - m_percentage, m_crossfadeSize);
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drawCrossfadeSubimage(context, m_toImage.get(), CompositeOperator::PlusLighter, m_percentage, m_crossfadeSize);
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context.endTransparencyLayer();
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}
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ImageDrawResult CrossfadeGeneratedImage::draw(GraphicsContext& context, const FloatRect& dstRect, const FloatRect& srcRect, const ImagePaintingOptions& options)
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{
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GraphicsContextStateSaver stateSaver(context);
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context.setCompositeOperation(options.compositeOperator(), options.blendMode());
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context.clip(dstRect);
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context.translate(dstRect.location());
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if (dstRect.size() != srcRect.size())
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context.scale(dstRect.size() / srcRect.size());
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context.translate(-srcRect.location());
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drawCrossfade(context);
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return ImageDrawResult::DidDraw;
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}
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void CrossfadeGeneratedImage::drawPattern(GraphicsContext& context, const FloatRect& dstRect, const FloatRect& srcRect, const AffineTransform& patternTransform, const FloatPoint& phase, const FloatSize& spacing, const ImagePaintingOptions& options)
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{
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auto imageBuffer = ImageBuffer::create(size(), context.renderingMode(), 1, DestinationColorSpace::SRGB(), PixelFormat::BGRA8);
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if (!imageBuffer)
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return;
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// Fill with the cross-faded image.
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GraphicsContext& graphicsContext = imageBuffer->context();
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drawCrossfade(graphicsContext);
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// Tile the image buffer into the context.
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imageBuffer->drawPattern(context, dstRect, srcRect, patternTransform, phase, spacing, options);
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}
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void CrossfadeGeneratedImage::dump(TextStream& ts) const
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{
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GeneratedImage::dump(ts);
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ts.dumpProperty("from-image", m_fromImage.get());
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ts.dumpProperty("to-image", m_toImage.get());
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ts.dumpProperty("percentage", m_percentage);
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}
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}
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