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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  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef DeferredImageDecoder_h
     27 #define DeferredImageDecoder_h
     28 
     29 #include "SkBitmap.h"
     30 #include "core/platform/graphics/ImageSource.h"
     31 #include "core/platform/graphics/IntSize.h"
     32 #include "core/platform/image-decoders/ImageDecoder.h"
     33 #include "wtf/Forward.h"
     34 #include "wtf/OwnPtr.h"
     35 #include "wtf/Vector.h"
     36 
     37 namespace WebCore {
     38 
     39 class ImageFrameGenerator;
     40 class SharedBuffer;
     41 
     42 class DeferredImageDecoder {
     43 public:
     44     ~DeferredImageDecoder();
     45     static PassOwnPtr<DeferredImageDecoder> create(const SharedBuffer& data, ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption);
     46 
     47     static PassOwnPtr<DeferredImageDecoder> createForTesting(PassOwnPtr<ImageDecoder>);
     48 
     49     static bool isLazyDecoded(const SkBitmap&);
     50 
     51     static SkBitmap createResizedLazyDecodingBitmap(const SkBitmap&, const SkISize& scaledSize, const SkIRect& scaledSubset);
     52 
     53     static void setEnabled(bool);
     54 
     55     String filenameExtension() const;
     56 
     57     ImageFrame* frameBufferAtIndex(size_t index);
     58 
     59     void setData(SharedBuffer* data, bool allDataReceived);
     60 
     61     bool isSizeAvailable();
     62     IntSize size() const;
     63     IntSize frameSizeAtIndex(size_t index) const;
     64     size_t frameCount();
     65     int repetitionCount() const;
     66     size_t clearCacheExceptFrame(size_t);
     67     bool frameHasAlphaAtIndex(size_t index) const;
     68     bool frameIsCompleteAtIndex(size_t) const;
     69     float frameDurationAtIndex(size_t) const;
     70     unsigned frameBytesAtIndex(size_t index) const;
     71     ImageOrientation orientation() const;
     72     bool hotSpot(IntPoint&) const;
     73 
     74 private:
     75     explicit DeferredImageDecoder(PassOwnPtr<ImageDecoder> actualDecoder);
     76     void prepareLazyDecodedFrames();
     77     SkBitmap createLazyDecodingBitmap(size_t index);
     78     void activateLazyDecoding();
     79     void setData(PassRefPtr<SharedBuffer>, bool allDataReceived);
     80 
     81     RefPtr<SharedBuffer> m_data;
     82     bool m_allDataReceived;
     83     OwnPtr<ImageDecoder> m_actualDecoder;
     84 
     85     String m_filenameExtension;
     86     IntSize m_size;
     87     ImageOrientation m_orientation;
     88     int m_repetitionCount;
     89 
     90     Vector<OwnPtr<ImageFrame> > m_lazyDecodedFrames;
     91     RefPtr<ImageFrameGenerator> m_frameGenerator;
     92 
     93     static bool s_enabled;
     94 };
     95 
     96 } // namespace WebCore
     97 
     98 #endif
     99