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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 "ImageFrameGenerator.h"
#include "LazyDecodingPixelRef.h"
#include <wtf/PassOwnPtr.h>
namespace WebCore {
namespace {
// URI label for a lazily decoded SkPixelRef.
const char labelLazyDecoded[] = "lazy";
} // namespace
bool DeferredImageDecoder::s_enabled = false;
DeferredImageDecoder::DeferredImageDecoder(ImageDecoder* actualDecoder)
: m_allDataReceived(false)
, m_actualDecoder(adoptPtr(actualDecoder))
, m_orientation(DefaultImageOrientation)
{
}
DeferredImageDecoder::~DeferredImageDecoder()
{
}
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()));
}
bool DeferredImageDecoder::isLazyDecoded(const SkBitmap& bitmap)
{
return bitmap.pixelRef()
&& bitmap.pixelRef()->getURI()
&& !memcmp(bitmap.pixelRef()->getURI(), labelLazyDecoded, sizeof(labelLazyDecoded));
}
SkBitmap DeferredImageDecoder::createResizedLazyDecodingBitmap(const SkBitmap& bitmap, const SkISize& scaledSize, const SkIRect& scaledSubset)
{
LazyDecodingPixelRef* pixelRef = static_cast<LazyDecodingPixelRef*>(bitmap.pixelRef());
int rowBytes = 0;
rowBytes = SkBitmap::ComputeRowBytes(SkBitmap::kARGB_8888_Config, scaledSize.width());
SkBitmap resizedBitmap;
resizedBitmap.setConfig(SkBitmap::kARGB_8888_Config, scaledSubset.width(), scaledSubset.height(), rowBytes);
// FIXME: This code has the potential problem that multiple
// LazyDecodingPixelRefs are created even though they share the same
// scaled size and ImageFrameGenerator.
resizedBitmap.setPixelRef(new LazyDecodingPixelRef(pixelRef->frameGenerator(), scaledSize, scaledSubset))->unref();
// See comments in createLazyDecodingBitmap().
resizedBitmap.setImmutable();
return resizedBitmap;
}
void DeferredImageDecoder::setEnabled(bool enabled)
{
s_enabled = enabled;
}
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 (s_enabled
&& m_actualDecoder
&& m_actualDecoder->repetitionCount() == cAnimationNone
&& m_actualDecoder->isSizeAvailable()) {
m_size = m_actualDecoder->size();
m_filenameExtension = m_actualDecoder->filenameExtension();
m_orientation = m_actualDecoder->orientation();
SkBitmap lazyDecodedSkBitmap = createLazyDecodingBitmap();
m_lazyDecodedFrame.setSkBitmap(lazyDecodedSkBitmap);
// 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);
m_frameGenerator->setData(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;
}
ImageOrientation DeferredImageDecoder::orientation() const
{
return m_actualDecoder ? m_actualDecoder->orientation() : m_orientation;
}
SkBitmap DeferredImageDecoder::createLazyDecodingBitmap()
{
SkISize fullSize = SkISize::Make(m_actualDecoder->size().width(), m_actualDecoder->size().height());
ASSERT(!fullSize.isEmpty());
SkIRect fullRect = SkIRect::MakeSize(fullSize);
// Creates a lazily decoded SkPixelRef that references the entire image without scaling.
SkBitmap bitmap;
bitmap.setConfig(SkBitmap::kARGB_8888_Config, fullSize.width(), fullSize.height());
m_frameGenerator = ImageFrameGenerator::create(fullSize, m_data.release(), m_allDataReceived);
m_actualDecoder.clear();
bitmap.setPixelRef(new LazyDecodingPixelRef(m_frameGenerator, fullSize, fullRect))->unref();
// Use the URI to identify this as a lazily decoded SkPixelRef of type LazyDecodingPixelRef.
// FIXME: It would be more useful to give the actual image URI.
bitmap.pixelRef()->setURI(labelLazyDecoded);
// Inform the bitmap that we will never change the pixels. This is a performance hint
// subsystems that may try to cache this bitmap (e.g. pictures, pipes, gpu, pdf, etc.)
bitmap.setImmutable();
// FIXME: Setting bitmap.setIsOpaque() is big performance gain if possible. We can
// do so safely if the image is fully loaded and it is a JPEG image, or if the image was
// decoded before.
return bitmap;
}
bool DeferredImageDecoder::hotSpot(IntPoint& hotSpot) const
{
return m_actualDecoder ? m_actualDecoder->hotSpot(hotSpot) : false;
}
} // namespace WebCore
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