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      1 /*
      2  * Copyright (c) 2013, 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef SkiaSharedBufferStream_h
     32 #define SkiaSharedBufferStream_h
     33 
     34 #include "core/platform/SharedBuffer.h"
     35 #include "third_party/skia/include/core/SkStream.h"
     36 #include "wtf/PassRefPtr.h"
     37 #include "wtf/RefPtr.h"
     38 
     39 namespace WebCore {
     40 
     41 class SkiaSharedBufferStream : public SkStreamAsset {
     42 public:
     43     static PassRefPtr<SkiaSharedBufferStream> create(PassRefPtr<SharedBuffer> buffer)
     44     {
     45         return adoptRef(new SkiaSharedBufferStream(buffer));
     46     }
     47 
     48     virtual ~SkiaSharedBufferStream()
     49     {
     50     }
     51 
     52     virtual size_t read(void* buffer, size_t bytesRequested) OVERRIDE;
     53     virtual bool isAtEnd() const OVERRIDE;
     54 
     55     virtual bool rewind() OVERRIDE;
     56     virtual SkiaSharedBufferStream* duplicate() const OVERRIDE;
     57 
     58     virtual size_t getPosition() const OVERRIDE;
     59     virtual bool seek(size_t position) OVERRIDE;
     60     virtual bool move(long offset) OVERRIDE;
     61     virtual SkiaSharedBufferStream* fork() const OVERRIDE;
     62 
     63     virtual size_t getLength() const OVERRIDE;
     64 
     65     virtual const void* getMemoryBase() OVERRIDE;
     66 
     67 private:
     68     explicit SkiaSharedBufferStream(PassRefPtr<SharedBuffer> buffer)
     69         : m_buffer(buffer)
     70         , m_offset(0)
     71     {
     72     }
     73 
     74     RefPtr<SharedBuffer> m_buffer;
     75     size_t m_offset;
     76 };
     77 
     78 }
     79 
     80 #endif
     81