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Viewing changes to Source/WebCore/platform/graphics/CrossfadeGeneratedImage.cpp

  • Committer: Package Import Robot
  • Author(s): Jonathan Riddell
  • Date: 2013-02-18 14:24:18 UTC
  • Revision ID: package-import@ubuntu.com-20130218142418-eon0jmjg3nj438uy
Tags: upstream-2.3
Import upstream version 2.3

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Source/WebCore/platform/graphics/CrossfadeGeneratedImage.cpp
 
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/*
 
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 * Copyright (C) 2011 Apple Inc. All rights reserved.
 
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 *
 
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 * Redistribution and use in source and binary forms, with or without
 
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 * modification, are permitted provided that the following conditions
 
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 * are met:
 
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 * 1. Redistributions of source code must retain the above copyright
 
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 *    notice, this list of conditions and the following disclaimer.
 
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 * 2. Redistributions in binary form must reproduce the above copyright
 
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 *    notice, this list of conditions and the following disclaimer in the
 
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 *    documentation and/or other materials provided with the distribution.
 
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 *
 
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 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 
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 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 
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 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 
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 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
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 */
 
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#include "config.h"
 
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#include "CrossfadeGeneratedImage.h"
 
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#include "FloatRect.h"
 
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#include "GraphicsContext.h"
 
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#include "ImageBuffer.h"
 
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#include "PlatformMemoryInstrumentation.h"
 
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using namespace std;
 
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namespace WebCore {
 
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CrossfadeGeneratedImage::CrossfadeGeneratedImage(Image* fromImage, Image* toImage, float percentage, IntSize crossfadeSize, const IntSize& size)
 
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    : m_fromImage(fromImage)
 
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    , m_toImage(toImage)
 
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    , m_percentage(percentage)
 
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    , m_crossfadeSize(crossfadeSize)
 
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{
 
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    m_size = size;
 
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}
 
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void CrossfadeGeneratedImage::drawCrossfade(GraphicsContext* context)
 
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{
 
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    float inversePercentage = 1 - m_percentage;
 
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    IntSize fromImageSize = m_fromImage->size();
 
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    IntSize toImageSize = m_toImage->size();
 
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    // Draw nothing if either of the images hasn't loaded yet.
 
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    if (m_fromImage == Image::nullImage() || m_toImage == Image::nullImage())
 
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        return;
 
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    GraphicsContextStateSaver stateSaver(*context);
 
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    context->clip(IntRect(IntPoint(), m_crossfadeSize));
 
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    context->beginTransparencyLayer(1);
 
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    // Draw the image we're fading away from.
 
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    context->save();
 
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    if (m_crossfadeSize != fromImageSize)
 
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        context->scale(FloatSize(static_cast<float>(m_crossfadeSize.width()) / fromImageSize.width(),
 
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                                 static_cast<float>(m_crossfadeSize.height()) / fromImageSize.height()));
 
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    context->setAlpha(inversePercentage);
 
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    context->drawImage(m_fromImage, ColorSpaceDeviceRGB, IntPoint());
 
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    context->restore();
 
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    // Draw the image we're fading towards.
 
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    context->save();
 
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    if (m_crossfadeSize != toImageSize)
 
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        context->scale(FloatSize(static_cast<float>(m_crossfadeSize.width()) / toImageSize.width(),
 
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                                 static_cast<float>(m_crossfadeSize.height()) / toImageSize.height()));
 
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    context->setAlpha(m_percentage);
 
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    context->drawImage(m_toImage, ColorSpaceDeviceRGB, IntPoint(), CompositePlusLighter);
 
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    context->restore();
 
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    context->endTransparencyLayer();
 
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}
 
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void CrossfadeGeneratedImage::draw(GraphicsContext* context, const FloatRect& dstRect, const FloatRect& srcRect, ColorSpace, CompositeOperator compositeOp)
 
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{
 
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    GraphicsContextStateSaver stateSaver(*context);
 
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    context->setCompositeOperation(compositeOp);
 
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    context->clip(dstRect);
 
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    context->translate(dstRect.x(), dstRect.y());
 
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    if (dstRect.size() != srcRect.size())
 
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        context->scale(FloatSize(dstRect.width() / srcRect.width(), dstRect.height() / srcRect.height()));
 
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    context->translate(-srcRect.x(), -srcRect.y());
 
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    drawCrossfade(context);
 
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}
 
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void CrossfadeGeneratedImage::drawPattern(GraphicsContext* context, const FloatRect& srcRect, const AffineTransform& patternTransform, const FloatPoint& phase, ColorSpace styleColorSpace, CompositeOperator compositeOp, const FloatRect& dstRect)
 
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{
 
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    OwnPtr<ImageBuffer> imageBuffer = ImageBuffer::create(m_size, 1, ColorSpaceDeviceRGB, context->isAcceleratedContext() ? Accelerated : Unaccelerated);
 
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    if (!imageBuffer)
 
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        return;
 
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    // Fill with the cross-faded image.
 
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    GraphicsContext* graphicsContext = imageBuffer->context();
 
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    drawCrossfade(graphicsContext);
 
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    // Tile the image buffer into the context.
 
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    imageBuffer->drawPattern(context, srcRect, patternTransform, phase, styleColorSpace, compositeOp, dstRect);
 
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}
 
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void CrossfadeGeneratedImage::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
 
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{
 
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    MemoryClassInfo info(memoryObjectInfo, this, PlatformMemoryTypes::Image);
 
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    GeneratedImage::reportMemoryUsage(memoryObjectInfo);
 
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    info.addMember(m_fromImage);
 
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    info.addMember(m_toImage);
 
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}
 
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}