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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/LazyDecodingPixelRef.h"
     28 
     29 #include "SkData.h"
     30 #include "platform/TraceEvent.h"
     31 #include "platform/graphics/ImageDecodingStore.h"
     32 #include "platform/graphics/ImageFrameGenerator.h"
     33 
     34 namespace WebCore {
     35 
     36 LazyDecodingPixelRef::LazyDecodingPixelRef(const SkImageInfo& info, PassRefPtr<ImageFrameGenerator> frameGenerator, size_t index)
     37     : LazyPixelRef(info)
     38     , m_frameGenerator(frameGenerator)
     39     , m_frameIndex(index)
     40     , m_lockedImageResource(0)
     41     , m_objectTracker(this)
     42 {
     43 }
     44 
     45 LazyDecodingPixelRef::~LazyDecodingPixelRef()
     46 {
     47 }
     48 
     49 SkData* LazyDecodingPixelRef::onRefEncodedData()
     50 {
     51     // If the image has been clipped or scaled, do not return the original encoded data, since
     52     // on playback it will not be known how the clipping/scaling was done.
     53     RefPtr<SharedBuffer> buffer = nullptr;
     54     bool allDataReceived = false;
     55     m_frameGenerator->copyData(&buffer, &allDataReceived);
     56     if (buffer && allDataReceived) {
     57         SkData* skdata = SkData::NewWithCopy((void*)buffer->data(), buffer->size());
     58         return skdata;
     59     }
     60     return 0;
     61 }
     62 
     63 bool LazyDecodingPixelRef::onNewLockPixels(LockRec* rec)
     64 {
     65     TRACE_EVENT_ASYNC_BEGIN0("webkit", "LazyDecodingPixelRef::onNewLockPixels", this);
     66 
     67     ASSERT(!m_lockedImageResource);
     68 
     69     SkISize size = m_frameGenerator->getFullSize();
     70     if (!ImageDecodingStore::instance()->lockCache(m_frameGenerator.get(), size, m_frameIndex, &m_lockedImageResource))
     71         m_lockedImageResource = 0;
     72 
     73     // Use ImageFrameGenerator to generate the image. It will lock the cache
     74     // entry for us.
     75     if (!m_lockedImageResource) {
     76         PlatformInstrumentation::willDecodeLazyPixelRef(getGenerationID());
     77         m_lockedImageResource = m_frameGenerator->decodeAndScale(size, m_frameIndex);
     78         PlatformInstrumentation::didDecodeLazyPixelRef();
     79     }
     80     if (!m_lockedImageResource)
     81         return false;
     82 
     83     ASSERT(!m_lockedImageResource->bitmap().isNull());
     84     ASSERT(m_lockedImageResource->scaledSize() == size);
     85     rec->fPixels = m_lockedImageResource->bitmap().getAddr(0, 0);
     86     rec->fColorTable = 0;
     87     rec->fRowBytes = m_lockedImageResource->bitmap().rowBytes();
     88     return true;
     89 }
     90 
     91 void LazyDecodingPixelRef::onUnlockPixels()
     92 {
     93     if (m_lockedImageResource) {
     94         ImageDecodingStore::instance()->unlockCache(m_frameGenerator.get(), m_lockedImageResource);
     95         m_lockedImageResource = 0;
     96     }
     97 
     98     TRACE_EVENT_ASYNC_END0("webkit", "LazyDecodingPixelRef::lockPixels", this);
     99 }
    100 
    101 bool LazyDecodingPixelRef::onLockPixelsAreWritable() const
    102 {
    103     return false;
    104 }
    105 
    106 bool LazyDecodingPixelRef::MaybeDecoded()
    107 {
    108     return ImageDecodingStore::instance()->isCached(m_frameGenerator.get(), m_frameGenerator->getFullSize(), m_frameIndex);
    109 }
    110 
    111 bool LazyDecodingPixelRef::PrepareToDecode(const LazyPixelRef::PrepareParams& params)
    112 {
    113     ASSERT(false);
    114     return false;
    115 }
    116 
    117 void LazyDecodingPixelRef::Decode()
    118 {
    119     lockPixels();
    120     unlockPixels();
    121 }
    122 
    123 
    124 } // namespace blink
    125