GeneratorGeneratedImage.cpp   [plain text]

/*
 * Copyright (C) 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions
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 *    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
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#include "config.h"
#include "GeneratorGeneratedImage.h"

#include "FloatRect.h"
#include "GraphicsContext.h"
#include "Length.h"

namespace WebCore {

void GeneratorGeneratedImage::draw(GraphicsContext* destContext, const FloatRect& destRect, const FloatRect& srcRect, ColorSpace, CompositeOperator compositeOp, BlendMode blendMode)
{
    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(), m_size), *m_gradient.get());
}

void GeneratorGeneratedImage::drawPattern(GraphicsContext* destContext, const FloatRect& srcRect, const AffineTransform& patternTransform,
    const FloatPoint& phase, ColorSpace styleColorSpace, CompositeOperator compositeOp, const FloatRect& destRect, BlendMode)
{
    // Allow the generator to provide visually-equivalent tiling parameters for better performance.
    IntSize adjustedSize = m_size;
    FloatRect adjustedSrcRect = srcRect;
    m_gradient->adjustParametersForTiledDrawing(adjustedSize, adjustedSrcRect);

    // 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.get())) {
        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;
    }

    // Tile the image buffer into the context.
    m_cachedImageBuffer->drawPattern(destContext, adjustedSrcRect, adjustedPatternCTM, phase, styleColorSpace, compositeOp, destRect);
}

}