2 * Copyright (C) 2011 Apple Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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27 #include "CrossfadeGeneratedImage.h"
29 #include "FloatRect.h"
30 #include "GraphicsContext.h"
31 #include "ImageBuffer.h"
37 CrossfadeGeneratedImage::CrossfadeGeneratedImage(Image* fromImage, Image* toImage, float percentage, IntSize crossfadeSize, const IntSize& size)
38 : m_fromImage(fromImage)
40 , m_percentage(percentage)
41 , m_crossfadeSize(crossfadeSize)
46 void CrossfadeGeneratedImage::drawCrossfade(GraphicsContext* context)
48 float inversePercentage = 1 - m_percentage;
50 IntSize fromImageSize = m_fromImage->size();
51 IntSize toImageSize = m_toImage->size();
53 // Draw nothing if either of the images hasn't loaded yet.
54 if (m_fromImage == Image::nullImage() || m_toImage == Image::nullImage())
57 GraphicsContextStateSaver stateSaver(*context);
59 context->clip(IntRect(IntPoint(), m_crossfadeSize));
60 context->beginTransparencyLayer(1);
62 // Draw the image we're fading away from.
64 if (m_crossfadeSize != fromImageSize)
65 context->scale(FloatSize(static_cast<float>(m_crossfadeSize.width()) / fromImageSize.width(),
66 static_cast<float>(m_crossfadeSize.height()) / fromImageSize.height()));
67 context->setAlpha(inversePercentage);
68 context->drawImage(m_fromImage, ColorSpaceDeviceRGB, IntPoint());
71 // Draw the image we're fading towards.
73 if (m_crossfadeSize != toImageSize)
74 context->scale(FloatSize(static_cast<float>(m_crossfadeSize.width()) / toImageSize.width(),
75 static_cast<float>(m_crossfadeSize.height()) / toImageSize.height()));
76 context->setAlpha(m_percentage);
77 context->drawImage(m_toImage, ColorSpaceDeviceRGB, IntPoint(), CompositePlusLighter);
80 context->endTransparencyLayer();
83 void CrossfadeGeneratedImage::draw(GraphicsContext* context, const FloatRect& dstRect, const FloatRect& srcRect, ColorSpace, CompositeOperator compositeOp)
85 GraphicsContextStateSaver stateSaver(*context);
86 context->setCompositeOperation(compositeOp);
87 context->clip(dstRect);
88 context->translate(dstRect.x(), dstRect.y());
89 if (dstRect.size() != srcRect.size())
90 context->scale(FloatSize(dstRect.width() / srcRect.width(), dstRect.height() / srcRect.height()));
91 context->translate(-srcRect.x(), -srcRect.y());
93 drawCrossfade(context);
96 void CrossfadeGeneratedImage::drawPattern(GraphicsContext* context, const FloatRect& srcRect, const AffineTransform& patternTransform, const FloatPoint& phase, ColorSpace styleColorSpace, CompositeOperator compositeOp, const FloatRect& dstRect)
98 OwnPtr<ImageBuffer> imageBuffer = ImageBuffer::create(m_size, 1, ColorSpaceDeviceRGB, context->isAcceleratedContext() ? Accelerated : Unaccelerated);
102 // Fill with the cross-faded image.
103 GraphicsContext* graphicsContext = imageBuffer->context();
104 drawCrossfade(graphicsContext);
106 // Tile the image buffer into the context.
107 imageBuffer->drawPattern(context, srcRect, patternTransform, phase, styleColorSpace, compositeOp, dstRect);