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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 "DeferredImageDecoder.h"
#include "ImageDecodingStore.h"
#include <wtf/PassOwnPtr.h>
namespace WebCore {
DeferredImageDecoder::DeferredImageDecoder(ImageDecoder* actualDecoder)
: m_allDataReceived(false)
, m_actualDecoder(adoptPtr(actualDecoder))
{
}
DeferredImageDecoder::~DeferredImageDecoder()
{
// FIXME: Remove the corresponding entry in ImageDecodingStore if image
// is defer-decoded.
}
DeferredImageDecoder* DeferredImageDecoder::create(const SharedBuffer& data, ImageSource::AlphaOption alphaOption, ImageSource::GammaAndColorProfileOption gammaAndColorOption)
{
ImageDecoder* actualDecoder = ImageDecoder::create(data, alphaOption, gammaAndColorOption);
return actualDecoder ? new DeferredImageDecoder(actualDecoder) : 0;
}
PassOwnPtr<DeferredImageDecoder> DeferredImageDecoder::createForTesting(PassOwnPtr<ImageDecoder> decoder)
{
return adoptPtr(new DeferredImageDecoder(decoder.leakPtr()));
}
String DeferredImageDecoder::filenameExtension() const
{
return m_actualDecoder ? m_actualDecoder->filenameExtension() : m_filenameExtension;
}
ImageFrame* DeferredImageDecoder::frameBufferAtIndex(size_t index)
{
// Only defer image decoding if this is a single frame image. The reason is
// because a multiframe is usually animated GIF. Animation is handled by
// BitmapImage which uses some metadata functions that do synchronous image
// decoding.
if (ImageDecodingStore::instanceOnMainThread()
&& m_actualDecoder
&& m_actualDecoder->repetitionCount() == cAnimationNone
&& m_actualDecoder->isSizeAvailable()) {
m_size = m_actualDecoder->size();
m_filenameExtension = m_actualDecoder->filenameExtension();
SkBitmap lazyDecodedSkBitmap = ImageDecodingStore::instanceOnMainThread()->createLazyDecodedSkBitmap(m_actualDecoder.release());
m_lazyDecodedFrame.setSkBitmap(lazyDecodedSkBitmap);
ImageDecodingStore::instanceOnMainThread()->setData(m_lazyDecodedFrame.getSkBitmap(), m_data.release(), m_allDataReceived);
// Don't mark the frame as completely decoded until the underlying
// decoder has really decoded it. Until then, our data and metadata may
// be incorrect, so callers can't rely on them.
m_lazyDecodedFrame.setStatus(ImageFrame::FramePartial);
}
return m_actualDecoder ? m_actualDecoder->frameBufferAtIndex(index) : &m_lazyDecodedFrame;
}
void DeferredImageDecoder::setData(SharedBuffer* data, bool allDataReceived)
{
if (m_actualDecoder) {
// Keep a reference to data until image decoding is deferred.
// When image decoding is deferred then ownership of m_data is
// transferred to ImageDecodingStore.
m_data = data;
m_allDataReceived = allDataReceived;
m_actualDecoder->setData(data, allDataReceived);
} else {
ASSERT(!m_data);
ImageDecodingStore::instanceOnMainThread()->setData(m_lazyDecodedFrame.getSkBitmap(), data, allDataReceived);
}
}
bool DeferredImageDecoder::isSizeAvailable()
{
// m_actualDecoder is 0 only if image decoding is deferred and that
// means image header decoded successfully and size is available.
return m_actualDecoder ? m_actualDecoder->isSizeAvailable() : true;
}
IntSize DeferredImageDecoder::size() const
{
return m_actualDecoder ? m_actualDecoder->size() : m_size;
}
IntSize DeferredImageDecoder::frameSizeAtIndex(size_t index) const
{
return m_actualDecoder ? m_actualDecoder->frameSizeAtIndex(index) : m_size;
}
size_t DeferredImageDecoder::frameCount()
{
return m_actualDecoder ? m_actualDecoder->frameCount() : 1;
}
int DeferredImageDecoder::repetitionCount() const
{
return m_actualDecoder ? m_actualDecoder->repetitionCount() : cAnimationNone;
}
void DeferredImageDecoder::clearFrameBufferCache(size_t clearBeforeFrame)
{
// If image decoding is deferred then frame buffer cache is managed by
// the compositor and this call is ignored.
if (m_actualDecoder)
m_actualDecoder->clearFrameBufferCache(clearBeforeFrame);
}
bool DeferredImageDecoder::frameHasAlphaAtIndex(size_t index) const
{
// FIXME: Synchronize this state with ImageDecodingStore when image is
// actually decoded. Return true here is correct in terms of rendering but
// may not go through some optimized rendering code path.
return m_actualDecoder ? m_actualDecoder->frameHasAlphaAtIndex(index) : true;
}
unsigned DeferredImageDecoder::frameBytesAtIndex(size_t index) const
{
// If frame decoding is deferred then it is not managed by MemoryCache
// so return 0 here.
return m_actualDecoder ? m_actualDecoder->frameBytesAtIndex(index) : 0;
}
} // namespace WebCore
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