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/*
* Copyright (C) 2012 Google 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 "config.h"
#include "ImageFrameGenerator.h"
#include "ImageDecoder.h"
#include "ImageDecodingStore.h"
#include "ScaledImageFragment.h"
#include "SharedBuffer.h"
#include "skia/ext/image_operations.h"
namespace WebCore {
namespace {
skia::ImageOperations::ResizeMethod resizeMethod()
{
return skia::ImageOperations::RESIZE_LANCZOS3;
}
} // namespace
ImageFrameGenerator::ImageFrameGenerator(const SkISize& fullSize, PassRefPtr<SharedBuffer> data, bool allDataReceived)
: m_fullSize(fullSize)
, m_allDataReceived(false)
{
setData(data, allDataReceived);
}
ImageFrameGenerator::~ImageFrameGenerator()
{
// TODO: Call ImageDecodingStore to remove all cache entries indexed
// by this object.
}
void ImageFrameGenerator::setData(PassRefPtr<SharedBuffer> data, bool allDataReceived)
{
// FIXME: Doing a full copy is expensive, instead copy only new data.
RefPtr<SharedBuffer> dataCopy = data->copy();
MutexLocker lock(m_dataMutex);
m_data = dataCopy;
m_allDataReceived = allDataReceived;
}
const ScaledImageFragment* ImageFrameGenerator::decodeAndScale(const SkISize& scaledSize)
{
// Prevents concurrent decode or scale operations on the same image data.
// Multiple LazyDecodingPixelRefs can call this method at the same time.
MutexLocker lock(m_decodeMutex);
const ScaledImageFragment* cachedImage = 0;
cachedImage = tryToLockCache(scaledSize);
if (cachedImage)
return cachedImage;
cachedImage = tryToScale(0, scaledSize);
if (cachedImage)
return cachedImage;
cachedImage = tryToDecodeAndScale(scaledSize);
if (cachedImage)
return cachedImage;
return 0;
}
const ScaledImageFragment* ImageFrameGenerator::tryToLockCache(const SkISize& scaledSize)
{
return ImageDecodingStore::instance()->lockCompleteCache(this, scaledSize);
}
const ScaledImageFragment* ImageFrameGenerator::tryToScale(const ScaledImageFragment* fullSizeImage, const SkISize& scaledSize)
{
// If the requested scaled size is the same as the full size then exit
// early. This saves a cache lookup.
if (scaledSize == m_fullSize)
return 0;
if (!fullSizeImage)
fullSizeImage = ImageDecodingStore::instance()->lockCompleteCache(this, m_fullSize);
if (!fullSizeImage)
return 0;
SkBitmap scaledBitmap = skia::ImageOperations::Resize(
fullSizeImage->bitmap(), resizeMethod(), scaledSize.width(), scaledSize.height());
OwnPtr<ScaledImageFragment> scaledImage = ScaledImageFragment::create(scaledSize, scaledBitmap, fullSizeImage->isComplete());
ImageDecodingStore::instance()->unlockCache(this, fullSizeImage);
return ImageDecodingStore::instance()->insertAndLockCache(this, scaledImage.release());
}
const ScaledImageFragment* ImageFrameGenerator::tryToDecodeAndScale(const SkISize& scaledSize)
{
RefPtr<SharedBuffer> data;
bool allDataReceived = false;
{
MutexLocker lock(m_dataMutex);
// FIXME: We should do a shallow copy instead. Now we're restricted by the API of SharedBuffer.
data = m_data->copy();
allDataReceived = m_allDataReceived;
}
OwnPtr<ImageDecoder> decoder(adoptPtr(ImageDecoder::create(*data.get(), ImageSource::AlphaPremultiplied, ImageSource::GammaAndColorProfileApplied)));
if (!decoder && m_imageDecoderFactory)
decoder = m_imageDecoderFactory->create();
if (!decoder)
return 0;
decoder->setData(data.get(), allDataReceived);
ImageFrame* frame = decoder->frameBufferAtIndex(0);
if (!frame || frame->status() == ImageFrame::FrameEmpty)
return 0;
bool isComplete = frame->status() == ImageFrame::FrameComplete;
SkBitmap fullSizeBitmap = frame->getSkBitmap();
ASSERT(fullSizeBitmap.width() == m_fullSize.width() && fullSizeBitmap.height() == m_fullSize.height());
const ScaledImageFragment* fullSizeImage = ImageDecodingStore::instance()->insertAndLockCache(
this, ScaledImageFragment::create(m_fullSize, fullSizeBitmap, isComplete));
if (m_fullSize == scaledSize)
return fullSizeImage;
return tryToScale(fullSizeImage, scaledSize);
}
} // namespace WebCore
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