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/*
* Copyright (C) 2008, 2009, 2010, 2012, 2013 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. AND ITS CONTRIBUTORS ``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 ITS 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 "GradientImage.h"
#include "FloatRect.h"
#include "GraphicsContext.h"
#include "ImageBuffer.h"
#include "Length.h"
#include "TextStream.h"
namespace WebCore {
GradientImage::GradientImage(PassRefPtr<Gradient> generator, const FloatSize& size)
: m_gradient(generator)
{
setContainerSize(size);
}
GradientImage::~GradientImage()
{
}
void GradientImage::draw(GraphicsContext& destContext, const FloatRect& destRect, const FloatRect& srcRect, CompositeOperator compositeOp, BlendMode blendMode, ImageOrientationDescription)
{
GraphicsContextStateSaver stateSaver(destContext);
destContext.setCompositeOperation(compositeOp, blendMode);
destContext.clip(destRect);
destContext.translate(destRect.x(), destRect.y());
if (destRect.size() != srcRect.size())
destContext.scale(FloatSize(destRect.width() / srcRect.width(), destRect.height() / srcRect.height()));
destContext.translate(-srcRect.x(), -srcRect.y());
destContext.fillRect(FloatRect(FloatPoint(), size()), *m_gradient.get());
}
void GradientImage::drawPattern(GraphicsContext& destContext, const FloatRect& srcRect, const AffineTransform& patternTransform,
const FloatPoint& phase, const FloatSize& spacing, CompositeOperator compositeOp, const FloatRect& destRect, BlendMode blendMode)
{
// Allow the generator to provide visually-equivalent tiling parameters for better performance.
FloatSize adjustedSize = size();
FloatRect adjustedSrcRect = srcRect;
m_gradient->adjustParametersForTiledDrawing(adjustedSize, adjustedSrcRect, spacing);
// Factor in the destination context's scale to generate at the best resolution
AffineTransform destContextCTM = destContext.getCTM(GraphicsContext::DefinitelyIncludeDeviceScale);
double xScale = fabs(destContextCTM.xScale());
double yScale = fabs(destContextCTM.yScale());
AffineTransform adjustedPatternCTM = patternTransform;
adjustedPatternCTM.scale(1.0 / xScale, 1.0 / yScale);
adjustedSrcRect.scale(xScale, yScale);
unsigned generatorHash = m_gradient->hash();
if (!m_cachedImageBuffer || m_cachedGeneratorHash != generatorHash || m_cachedAdjustedSize != adjustedSize || !destContext.isCompatibleWithBuffer(*m_cachedImageBuffer)) {
m_cachedImageBuffer = destContext.createCompatibleBuffer(adjustedSize, m_gradient->hasAlpha());
if (!m_cachedImageBuffer)
return;
// Fill with the generated image.
m_cachedImageBuffer->context().fillRect(FloatRect(FloatPoint(), adjustedSize), *m_gradient);
m_cachedGeneratorHash = generatorHash;
m_cachedAdjustedSize = adjustedSize;
if (destContext.drawLuminanceMask())
m_cachedImageBuffer->convertToLuminanceMask();
}
destContext.setDrawLuminanceMask(false);
// Tile the image buffer into the context.
m_cachedImageBuffer->drawPattern(destContext, adjustedSrcRect, adjustedPatternCTM, phase, spacing, compositeOp, destRect, blendMode);
}
void GradientImage::dump(TextStream& ts) const
{
GeneratedImage::dump(ts);
// FIXME: dump the gradient.
}
}
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