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