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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"
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->isSVGImage();
GraphicsContextStateSaver stateSaver(*context);
context->setCompositeOperation(operation);
if (useTransparencyLayer)
context->beginTransparencyLayer(opacity);
else
context->setAlpha(opacity);
if (targetSize != imageSize)
context->scale(FloatSize(targetSize.width() / imageSize.width(), targetSize.height() / imageSize.height()));
context->drawImage(image, ColorSpaceDeviceRGB, IntPoint());
if (useTransparencyLayer)
context->endTransparencyLayer();
}
void CrossfadeGeneratedImage::drawCrossfade(GraphicsContext* context)
{
// Draw nothing if either of the images hasn't loaded yet.
if (m_fromImage == Image::nullImage() || m_toImage == Image::nullImage())
return;
GraphicsContextStateSaver stateSaver(*context);
context->clip(FloatRect(FloatPoint(), m_crossfadeSize));
context->beginTransparencyLayer(1);
drawCrossfadeSubimage(context, m_fromImage, CompositeSourceOver, 1 - m_percentage, m_crossfadeSize);
drawCrossfadeSubimage(context, m_toImage, CompositePlusLighter, m_percentage, m_crossfadeSize);
context->endTransparencyLayer();
}
void CrossfadeGeneratedImage::draw(GraphicsContext* context, const FloatRect& dstRect, const FloatRect& srcRect, ColorSpace, CompositeOperator compositeOp, BlendMode blendMode, ImageOrientationDescription)
{
GraphicsContextStateSaver stateSaver(*context);
context->setCompositeOperation(compositeOp, blendMode);
context->clip(dstRect);
context->translate(dstRect.x(), dstRect.y());
if (dstRect.size() != srcRect.size())
context->scale(FloatSize(dstRect.width() / srcRect.width(), dstRect.height() / srcRect.height()));
context->translate(-srcRect.x(), -srcRect.y());
drawCrossfade(context);
}
void CrossfadeGeneratedImage::drawPattern(GraphicsContext* context, const FloatRect& srcRect, const AffineTransform& patternTransform, const FloatPoint& phase, ColorSpace styleColorSpace, CompositeOperator compositeOp, const FloatRect& dstRect, BlendMode blendMode)
{
std::unique_ptr<ImageBuffer> imageBuffer = ImageBuffer::create(size(), 1, ColorSpaceDeviceRGB, context->isAcceleratedContext() ? Accelerated : Unaccelerated);
if (!imageBuffer)
return;
// Fill with the cross-faded image.
GraphicsContext* graphicsContext = imageBuffer->context();
drawCrossfade(graphicsContext);
// Tile the image buffer into the context.
imageBuffer->drawPattern(context, srcRect, patternTransform, phase, styleColorSpace, compositeOp, dstRect, blendMode);
}
}
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