1/*
2 * Copyright 2009, The Android Open Source Project
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 *  * Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 *  * 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 THE COPYRIGHT HOLDERS ``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 THE COPYRIGHT OWNER 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 WebCore_BitmapAllocatorAndroid_DEFINED
27#define WebCore_BitmapAllocatorAndroid_DEFINED
28
29#include "SkBitmap.h"
30
31namespace WebCore {
32
33    class SharedBuffer;
34    class SharedBufferStream;
35
36    /** Returns a custom allocator that takes advantage of ashmem and global
37        pools to best manage the pixel memory for a decoded image. This should
38        be used for images that are logically immutable, and can be re-decoded
39        at will based on available memory.
40     */
41    class BitmapAllocatorAndroid : public SkBitmap::Allocator {
42    public:
43        BitmapAllocatorAndroid(SharedBuffer* data, int sampleSize);
44        virtual ~BitmapAllocatorAndroid();
45
46        // overrides
47        virtual bool allocPixelRef(SkBitmap*, SkColorTable*);
48
49    private:
50        SharedBufferStream* fStream;
51        int                 fSampleSize;
52    };
53
54}
55
56size_t computeMaxBitmapSizeForCache();
57
58#endif
59