WebCore/platform/graphics/android/BitmapAllocatorAndroid.h

/*
 * Copyright 2009, The Android Open Source Project
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * 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 THE COPYRIGHT HOLDERS ``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 THE COPYRIGHT OWNER OR
 * 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.
 */

#ifndef WebCore_BitmapAllocatorAndroid_DEFINED
#define WebCore_BitmapAllocatorAndroid_DEFINED

#include "SkBitmap.h"

namespace WebCore {

    class SharedBuffer;
    class SharedBufferStream;

    /** Returns a custom allocator that takes advantage of ashmem and global
        pools to best manage the pixel memory for a decoded image. This should
        be used for images that are logically immutable, and can be re-decoded
        at will based on available memory.
     */
    class BitmapAllocatorAndroid : public SkBitmap::Allocator {
    public:
        BitmapAllocatorAndroid(SharedBuffer* data, int sampleSize);
        virtual ~BitmapAllocatorAndroid();

        // overrides
        virtual bool allocPixelRef(SkBitmap*, SkColorTable*);

    private:
        SharedBufferStream* fStream;
        int                 fSampleSize;
    };

}

#endif