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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 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
* 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 "BackingStore.h"
#include "CGUtilities.h"
#include "ShareableBitmap.h"
#include "UpdateInfo.h"
#include "WebPageProxy.h"
#include <WebCore/GraphicsContext.h>
using namespace WebCore;
namespace WebKit {
void BackingStore::paint(PlatformGraphicsContext context, const IntRect& rect)
{
if (m_cgLayer) {
CGContextSaveGState(context);
CGContextClipToRect(context, rect);
CGContextScaleCTM(context, 1, -1);
CGContextDrawLayerAtPoint(context, CGPointMake(0, -m_size.height()), m_cgLayer.get());
CGContextRestoreGState(context);
return;
}
ASSERT(m_bitmapContext);
paintBitmapContext(context, m_bitmapContext.get(), rect.location(), rect);
}
CGContextRef BackingStore::backingStoreContext()
{
if (m_cgLayer)
return CGLayerGetContext(m_cgLayer.get());
// Try to create a layer.
if (CGContextRef containingWindowContext = m_webPageProxy->containingWindowGraphicsContext()) {
m_cgLayer.adoptCF(CGLayerCreateWithContext(containingWindowContext, NSSizeToCGSize(m_size), 0));
CGContextRef layerContext = CGLayerGetContext(m_cgLayer.get());
CGContextSetBlendMode(layerContext, kCGBlendModeCopy);
// We want the origin to be in the top left corner so flip the backing store context.
CGContextTranslateCTM(layerContext, 0, m_size.height());
CGContextScaleCTM(layerContext, 1, -1);
if (m_bitmapContext) {
// Paint the contents of the bitmap into the layer context.
paintBitmapContext(layerContext, m_bitmapContext.get(), CGPointZero, CGRectMake(0, 0, m_size.width(), m_size.height()));
m_bitmapContext = nullptr;
}
return layerContext;
}
if (!m_bitmapContext) {
RetainPtr<CGColorSpaceRef> colorSpace(AdoptCF, CGColorSpaceCreateDeviceRGB());
m_bitmapContext.adoptCF(CGBitmapContextCreate(0, m_size.width(), m_size.height(), 8, m_size.width() * 4, colorSpace.get(), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
CGContextSetBlendMode(m_bitmapContext.get(), kCGBlendModeCopy);
// We want the origin to be in the top left corner so flip the backing store context.
CGContextTranslateCTM(m_bitmapContext.get(), 0, m_size.height());
CGContextScaleCTM(m_bitmapContext.get(), 1, -1);
}
return m_bitmapContext.get();
}
void BackingStore::incorporateUpdate(ShareableBitmap* bitmap, const UpdateInfo& updateInfo)
{
CGContextRef context = backingStoreContext();
scroll(updateInfo.scrollRect, updateInfo.scrollOffset);
IntPoint updateRectLocation = updateInfo.updateRectBounds.location();
GraphicsContext graphicsContext(context);
// Paint all update rects.
for (size_t i = 0; i < updateInfo.updateRects.size(); ++i) {
IntRect updateRect = updateInfo.updateRects[i];
IntRect srcRect = updateRect;
srcRect.move(-updateRectLocation.x(), -updateRectLocation.y());
bitmap->paint(graphicsContext, updateRect.location(), srcRect);
}
}
void BackingStore::scroll(const IntRect& scrollRect, const IntSize& scrollOffset)
{
if (scrollOffset.isZero())
return;
if (m_cgLayer) {
CGContextRef layerContext = CGLayerGetContext(m_cgLayer.get());
// Scroll the layer by painting it into itself with the given offset.
CGContextSaveGState(layerContext);
CGContextClipToRect(layerContext, scrollRect);
CGContextScaleCTM(layerContext, 1, -1);
CGContextDrawLayerAtPoint(layerContext, CGPointMake(scrollOffset.width(), -m_size.height() - scrollOffset.height()), m_cgLayer.get());
CGContextRestoreGState(layerContext);
return;
}
ASSERT(m_bitmapContext);
CGContextSaveGState(m_bitmapContext.get());
CGContextClipToRect(m_bitmapContext.get(), scrollRect);
CGPoint destination = CGPointMake(scrollRect.x() + scrollOffset.width(), scrollRect.y() + scrollOffset.height());
paintBitmapContext(m_bitmapContext.get(), m_bitmapContext.get(), destination, scrollRect);
CGContextRestoreGState(m_bitmapContext.get());
}
} // namespace WebKit
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