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      1 /*
      2  * Copyright (C) 2012 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     17  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     18  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     21  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "platform/graphics/DecodingImageGenerator.h"
     28 
     29 #include "SkData.h"
     30 #include "SkImageInfo.h"
     31 #include "platform/PlatformInstrumentation.h"
     32 #include "platform/SharedBuffer.h"
     33 #include "platform/TraceEvent.h"
     34 #include "platform/graphics/ImageFrameGenerator.h"
     35 
     36 namespace WebCore {
     37 
     38 DecodingImageGenerator::DecodingImageGenerator(PassRefPtr<ImageFrameGenerator> frameGenerator, const SkImageInfo& info, size_t index)
     39     : m_frameGenerator(frameGenerator)
     40     , m_imageInfo(info)
     41     , m_frameIndex(index)
     42     , m_generationId(0)
     43 {
     44 }
     45 
     46 DecodingImageGenerator::~DecodingImageGenerator()
     47 {
     48 }
     49 
     50 SkData* DecodingImageGenerator::onRefEncodedData()
     51 {
     52     // FIXME: If the image has been clipped or scaled, do not return the original
     53     // encoded data, since on playback it will not be known how the clipping/scaling
     54     // was done.
     55     RefPtr<SharedBuffer> buffer = nullptr;
     56     bool allDataReceived = false;
     57     m_frameGenerator->copyData(&buffer, &allDataReceived);
     58     if (buffer && allDataReceived)
     59         return SkData::NewWithCopy(buffer->data(), buffer->size());
     60     return 0;
     61 }
     62 
     63 bool DecodingImageGenerator::onGetInfo(SkImageInfo* info)
     64 {
     65     *info = m_imageInfo;
     66     return true;
     67 }
     68 
     69 bool DecodingImageGenerator::onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes, SkPMColor ctable[], int* ctableCount)
     70 {
     71     TRACE_EVENT1("webkit", "DecodingImageGenerator::getPixels", "index", static_cast<int>(m_frameIndex));
     72 
     73     // Implementation doesn't support scaling yet so make sure we're not given
     74     // a different size.
     75     ASSERT(info.fWidth == m_imageInfo.fWidth);
     76     ASSERT(info.fHeight == m_imageInfo.fHeight);
     77     ASSERT(info.fColorType == m_imageInfo.fColorType);
     78     ASSERT(info.fAlphaType == m_imageInfo.fAlphaType);
     79     PlatformInstrumentation::willDecodeLazyPixelRef(m_generationId);
     80     bool decoded = m_frameGenerator->decodeAndScale(m_imageInfo, m_frameIndex, pixels, rowBytes);
     81     PlatformInstrumentation::didDecodeLazyPixelRef();
     82     return decoded;
     83 }
     84 
     85 } // namespace blink
     86