mirror of
https://github.com/flutter/flutter.git
synced 2026-02-20 02:29:02 +08:00
101 lines
4.0 KiB
C++
101 lines
4.0 KiB
C++
/*
|
|
* 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 "sky/engine/platform/graphics/CrossfadeGeneratedImage.h"
|
|
|
|
#include "sky/engine/platform/geometry/FloatRect.h"
|
|
#include "sky/engine/platform/graphics/GraphicsContextStateSaver.h"
|
|
|
|
namespace blink {
|
|
|
|
CrossfadeGeneratedImage::CrossfadeGeneratedImage(Image* fromImage, Image* toImage, float percentage, IntSize crossfadeSize, const IntSize& size)
|
|
: m_fromImage(fromImage)
|
|
, m_toImage(toImage)
|
|
, m_percentage(percentage)
|
|
, m_crossfadeSize(crossfadeSize)
|
|
{
|
|
m_size = size;
|
|
}
|
|
|
|
void CrossfadeGeneratedImage::drawCrossfade(GraphicsContext* context)
|
|
{
|
|
float inversePercentage = 1 - m_percentage;
|
|
|
|
IntSize fromImageSize = m_fromImage->size();
|
|
IntSize toImageSize = m_toImage->size();
|
|
|
|
// Draw nothing if either of the images hasn't loaded yet.
|
|
if (m_fromImage == Image::nullImage() || m_toImage == Image::nullImage())
|
|
return;
|
|
|
|
GraphicsContextStateSaver stateSaver(*context);
|
|
|
|
context->clip(IntRect(IntPoint(), m_crossfadeSize));
|
|
context->beginTransparencyLayer(1);
|
|
|
|
// Draw the image we're fading away from.
|
|
context->save();
|
|
if (m_crossfadeSize != fromImageSize) {
|
|
context->scale(
|
|
static_cast<float>(m_crossfadeSize.width()) / fromImageSize.width(),
|
|
static_cast<float>(m_crossfadeSize.height()) / fromImageSize.height());
|
|
}
|
|
context->setAlphaAsFloat(inversePercentage);
|
|
context->drawImage(m_fromImage, IntPoint());
|
|
context->restore();
|
|
|
|
// Draw the image we're fading towards.
|
|
context->save();
|
|
if (m_crossfadeSize != toImageSize) {
|
|
context->scale(
|
|
static_cast<float>(m_crossfadeSize.width()) / toImageSize.width(),
|
|
static_cast<float>(m_crossfadeSize.height()) / toImageSize.height());
|
|
}
|
|
context->setAlphaAsFloat(m_percentage);
|
|
context->drawImage(m_toImage, IntPoint(), CompositePlusLighter);
|
|
context->restore();
|
|
|
|
context->endLayer();
|
|
}
|
|
|
|
void CrossfadeGeneratedImage::draw(GraphicsContext* context, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator compositeOp, WebBlendMode blendMode)
|
|
{
|
|
GraphicsContextStateSaver stateSaver(*context);
|
|
context->setCompositeOperation(compositeOp, blendMode);
|
|
context->clip(dstRect);
|
|
context->translate(dstRect.x(), dstRect.y());
|
|
if (dstRect.size() != srcRect.size())
|
|
context->scale(dstRect.width() / srcRect.width(), dstRect.height() / srcRect.height());
|
|
context->translate(-srcRect.x(), -srcRect.y());
|
|
|
|
drawCrossfade(context);
|
|
}
|
|
|
|
void CrossfadeGeneratedImage::drawPattern(GraphicsContext* context, const FloatRect& srcRect, const FloatSize& scale, const FloatPoint& phase, CompositeOperator compositeOp, const FloatRect& dstRect, WebBlendMode blendMode, const IntSize& repeatSpacing)
|
|
{
|
|
}
|
|
|
|
} // namespace blink
|