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/*
* Copyright (C) 2008-2016 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 "Gradient.h"
#include "GraphicsContext.h"
#include "ImageBuffer.h"
namespace WebCore {
GradientImage::GradientImage(Gradient& generator, const FloatSize& size)
: m_gradient(generator)
{
setContainerSize(size);
}
GradientImage::~GradientImage() = default;
ImageDrawResult GradientImage::draw(GraphicsContext& destContext, const FloatRect& destRect, const FloatRect& srcRect, ImagePaintingOptions options)
{
GraphicsContextStateSaver stateSaver(destContext);
destContext.setCompositeOperation(options.compositeOperator(), options.blendMode());
destContext.clip(destRect);
destContext.translate(destRect.location());
if (destRect.size() != srcRect.size())
destContext.scale(destRect.size() / srcRect.size());
destContext.translate(-srcRect.location());
destContext.fillRect(FloatRect(FloatPoint(), size()), m_gradient.get());
return ImageDrawResult::DidDraw;
}
void GradientImage::drawPattern(GraphicsContext& destContext, const FloatRect& destRect, const FloatRect& srcRect, const AffineTransform& patternTransform,
const FloatPoint& phase, const FloatSize& spacing, ImagePaintingOptions options)
{
// 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 = std::abs(destContextCTM.xScale());
double yScale = std::abs(destContextCTM.yScale());
AffineTransform adjustedPatternCTM = patternTransform;
adjustedPatternCTM.scale(1.0 / xScale, 1.0 / yScale);
adjustedSrcRect.scale(xScale, yScale);
unsigned generatorHash = m_gradient->hash();
if (!m_cachedImage || m_cachedGeneratorHash != generatorHash || m_cachedAdjustedSize != adjustedSize || !areEssentiallyEqual(destContext.scaleFactor(), m_cachedScaleFactor)) {
auto imageBuffer = destContext.createAlignedImageBuffer(adjustedSize);
if (!imageBuffer)
return;
// Fill with the generated image.
imageBuffer->context().fillRect(FloatRect(FloatPoint(), adjustedSize), m_gradient.get());
m_cachedGeneratorHash = generatorHash;
m_cachedAdjustedSize = adjustedSize;
m_cachedScaleFactor = destContext.scaleFactor();
if (destContext.drawLuminanceMask())
imageBuffer->convertToLuminanceMask();
m_cachedImage = WTFMove(imageBuffer);
if (!m_cachedImage)
return;
}
destContext.setDrawLuminanceMask(false);
destContext.drawPattern(Ref { *m_cachedImage }, destRect, adjustedSrcRect, adjustedPatternCTM, phase, spacing, options);
}
void GradientImage::dump(WTF::TextStream& ts) const
{
GeneratedImage::dump(ts);
// FIXME: dump the gradient.
}
}
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