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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 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 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 "platform/graphics/DecodingImageGenerator.h"
#include "platform/PlatformInstrumentation.h"
#include "platform/SharedBuffer.h"
#include "platform/graphics/ImageFrameGenerator.h"
#include "platform/image-decoders/ImageDecoder.h"
#include "platform/image-decoders/SegmentReader.h"
#include "platform/instrumentation/tracing/TraceEvent.h"
#include "third_party/skia/include/core/SkData.h"
#include <memory>
namespace blink {
DecodingImageGenerator::DecodingImageGenerator(
PassRefPtr<ImageFrameGenerator> frameGenerator,
const SkImageInfo& info,
PassRefPtr<SegmentReader> data,
bool allDataReceived,
size_t index,
uint32_t uniqueID)
: SkImageGenerator(info, uniqueID),
m_frameGenerator(frameGenerator),
m_data(data),
m_allDataReceived(allDataReceived),
m_frameIndex(index),
m_canYUVDecode(false) {}
DecodingImageGenerator::~DecodingImageGenerator() {}
SkData* DecodingImageGenerator::onRefEncodedData(GrContext* ctx) {
TRACE_EVENT0("blink", "DecodingImageGenerator::refEncodedData");
// The GPU only wants the data if it has all been received, since the GPU
// only wants a complete texture. getAsSkData() may require copying, so
// skip it and just return nullptr to avoid a slowdown. (See
// crbug.com/568016 for details about such a slowdown.)
// TODO (scroggo): Stop relying on the internal knowledge of how Skia uses
// this. skbug.com/5485
if (ctx && !m_allDataReceived)
return nullptr;
// Other clients are serializers, which want the data even if it requires
// copying, and even if the data is incomplete. (Otherwise they would
// potentially need to decode the partial image in order to re-encode it.)
return m_data->getAsSkData().release();
}
bool DecodingImageGenerator::onGetPixels(const SkImageInfo& info,
void* pixels,
size_t rowBytes,
SkPMColor table[],
int* tableCount) {
TRACE_EVENT1("blink", "DecodingImageGenerator::getPixels", "frame index",
static_cast<int>(m_frameIndex));
// Implementation doesn't support scaling yet, so make sure we're not given a
// different size.
if (info.width() != getInfo().width() || info.height() != getInfo().height())
return false;
if (info.colorType() != getInfo().colorType()) {
// blink::ImageFrame may have changed the owning SkBitmap to
// kOpaque_SkAlphaType after fully decoding the image frame, so if we see a
// request for opaque, that is ok even if our initial alpha type was not
// opaque.
return false;
}
PlatformInstrumentation::willDecodeLazyPixelRef(uniqueID());
bool decoded = m_frameGenerator->decodeAndScale(
m_data.get(), m_allDataReceived, m_frameIndex, getInfo(), pixels,
rowBytes);
PlatformInstrumentation::didDecodeLazyPixelRef();
return decoded;
}
bool DecodingImageGenerator::onQueryYUV8(SkYUVSizeInfo* sizeInfo,
SkYUVColorSpace* colorSpace) const {
// YUV decoding does not currently support progressive decoding. See comment
// in ImageFrameGenerator.h.
if (!m_canYUVDecode || !m_allDataReceived)
return false;
TRACE_EVENT1("blink", "DecodingImageGenerator::queryYUV8", "sizes",
static_cast<int>(m_frameIndex));
if (colorSpace)
*colorSpace = kJPEG_SkYUVColorSpace;
return m_frameGenerator->getYUVComponentSizes(m_data.get(), sizeInfo);
}
bool DecodingImageGenerator::onGetYUV8Planes(const SkYUVSizeInfo& sizeInfo,
void* planes[3]) {
// YUV decoding does not currently support progressive decoding. See comment
// in ImageFrameGenerator.h.
ASSERT(m_canYUVDecode && m_allDataReceived);
TRACE_EVENT1("blink", "DecodingImageGenerator::getYUV8Planes", "frame index",
static_cast<int>(m_frameIndex));
PlatformInstrumentation::willDecodeLazyPixelRef(uniqueID());
bool decoded =
m_frameGenerator->decodeToYUV(m_data.get(), m_frameIndex, sizeInfo.fSizes,
planes, sizeInfo.fWidthBytes);
PlatformInstrumentation::didDecodeLazyPixelRef();
return decoded;
}
SkImageGenerator* DecodingImageGenerator::create(SkData* data) {
RefPtr<SegmentReader> segmentReader =
SegmentReader::createFromSkData(sk_ref_sp(data));
// We just need the size of the image, so we have to temporarily create an
// ImageDecoder. Since we only need the size, the premul and gamma settings
// don't really matter.
std::unique_ptr<ImageDecoder> decoder = ImageDecoder::create(
segmentReader, true, ImageDecoder::AlphaPremultiplied,
ColorBehavior::transformToGlobalTarget());
if (!decoder || !decoder->isSizeAvailable())
return nullptr;
const IntSize size = decoder->size();
const SkImageInfo info =
SkImageInfo::MakeN32(size.width(), size.height(), kPremul_SkAlphaType,
decoder->colorSpaceForSkImages());
RefPtr<ImageFrameGenerator> frame =
ImageFrameGenerator::create(SkISize::Make(size.width(), size.height()),
false, decoder->colorBehavior());
if (!frame)
return nullptr;
return new DecodingImageGenerator(frame, info, segmentReader.release(), true,
0);
}
} // namespace blink
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