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/*
* Copyright (C) 2011 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
* 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 "platform/graphics/CrossfadeGeneratedImage.h"
#include "platform/geometry/FloatRect.h"
#include "platform/graphics/GraphicsContext.h"
namespace blink {
CrossfadeGeneratedImage::CrossfadeGeneratedImage(PassRefPtr<Image> fromImage,
PassRefPtr<Image> toImage,
float percentage,
IntSize crossfadeSize,
const IntSize& size)
: GeneratedImage(size),
m_fromImage(fromImage),
m_toImage(toImage),
m_percentage(percentage),
m_crossfadeSize(crossfadeSize) {}
void CrossfadeGeneratedImage::drawCrossfade(
SkCanvas* canvas,
const SkPaint& paint,
ImageClampingMode clampMode,
const ColorBehavior& colorBehavior) {
FloatRect fromImageRect(FloatPoint(), FloatSize(m_fromImage->size()));
FloatRect toImageRect(FloatPoint(), FloatSize(m_toImage->size()));
FloatRect destRect((FloatPoint()), FloatSize(m_crossfadeSize));
// TODO(junov): The various effects encoded into paint should probably be
// applied here instead of inside the layer. This probably faulty behavior
// was maintained in order to preserve pre-existing behavior while refactoring
// this code. This should be investigated further. crbug.com/472634
SkPaint layerPaint;
layerPaint.setBlendMode(paint.getBlendMode());
SkAutoCanvasRestore ar(canvas, false);
canvas->saveLayer(nullptr, &layerPaint);
SkPaint imagePaint(paint);
imagePaint.setBlendMode(SkBlendMode::kSrcOver);
int imageAlpha = clampedAlphaForBlending(1 - m_percentage);
imagePaint.setAlpha(imageAlpha > 255 ? 255 : imageAlpha);
imagePaint.setAntiAlias(paint.isAntiAlias());
// TODO(junov): This code should probably be propagating the
// RespectImageOrientationEnum from CrossfadeGeneratedImage::draw(). Code was
// written this way during refactoring to avoid modifying existing behavior,
// but this warrants further investigation. crbug.com/472634
m_fromImage->draw(canvas, imagePaint, destRect, fromImageRect,
DoNotRespectImageOrientation, clampMode, colorBehavior);
imagePaint.setBlendMode(SkBlendMode::kPlus);
imageAlpha = clampedAlphaForBlending(m_percentage);
imagePaint.setAlpha(imageAlpha > 255 ? 255 : imageAlpha);
m_toImage->draw(canvas, imagePaint, destRect, toImageRect,
DoNotRespectImageOrientation, clampMode, colorBehavior);
}
void CrossfadeGeneratedImage::draw(SkCanvas* canvas,
const SkPaint& paint,
const FloatRect& dstRect,
const FloatRect& srcRect,
RespectImageOrientationEnum,
ImageClampingMode clampMode,
const ColorBehavior& colorBehavior) {
// Draw nothing if either of the images hasn't loaded yet.
if (m_fromImage == Image::nullImage() || m_toImage == Image::nullImage())
return;
SkAutoCanvasRestore ar(canvas, true);
canvas->clipRect(dstRect);
canvas->translate(dstRect.x(), dstRect.y());
if (dstRect.size() != srcRect.size())
canvas->scale(dstRect.width() / srcRect.width(),
dstRect.height() / srcRect.height());
canvas->translate(-srcRect.x(), -srcRect.y());
drawCrossfade(canvas, paint, clampMode, colorBehavior);
}
void CrossfadeGeneratedImage::drawTile(GraphicsContext& context,
const FloatRect& srcRect) {
// Draw nothing if either of the images hasn't loaded yet.
if (m_fromImage == Image::nullImage() || m_toImage == Image::nullImage())
return;
SkPaint paint = context.fillPaint();
paint.setBlendMode(SkBlendMode::kSrcOver);
paint.setAntiAlias(context.shouldAntialias());
FloatRect destRect((FloatPoint()), FloatSize(m_crossfadeSize));
paint.setFilterQuality(context.computeFilterQuality(this, destRect, srcRect));
drawCrossfade(context.canvas(), paint, ClampImageToSourceRect,
context.getColorBehavior());
}
} // namespace blink
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