1/*
2 * Copyright 2014 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#ifndef SkBitmapCache_DEFINED
9#define SkBitmapCache_DEFINED
10
11#include "SkScalar.h"
12#include "SkBitmap.h"
13
14class SkResourceCache;
15class SkMipMap;
16
17class SkBitmapCache {
18public:
19    /**
20     * Use this allocator for bitmaps, so they can use ashmem when available.
21     * Returns NULL if the ResourceCache has not been initialized with a DiscardableFactory.
22     */
23    static SkBitmap::Allocator* GetAllocator();
24
25    /**
26     *  Search based on the src bitmap and inverse scales in X and Y. If found, returns true and
27     *  result will be set to the matching bitmap with its pixels already locked.
28     */
29    static bool Find(const SkBitmap& src, SkScalar invScaleX, SkScalar invScaleY, SkBitmap* result,
30                     SkResourceCache* localCache = NULL);
31
32    /*
33     *  result must be marked isImmutable()
34     */
35    static void Add(const SkBitmap& src, SkScalar invScaleX, SkScalar invScaleY,
36            const SkBitmap& result, SkResourceCache* localCache = NULL);
37
38    /**
39     *  Search based on the bitmap's genID and subset. If found, returns true and
40     *  result will be set to the matching bitmap with its pixels already locked.
41     */
42    static bool Find(uint32_t genID, const SkIRect& subset, SkBitmap* result,
43                     SkResourceCache* localCache = NULL);
44
45    /**
46     * The width and the height of the provided subset must be the same as the result bitmap ones.
47     * result must be marked isImmutable()
48     */
49    static bool Add(uint32_t genID, const SkIRect& subset, const SkBitmap& result,
50                    SkResourceCache* localCache = NULL);
51};
52
53class SkMipMapCache {
54public:
55    static const SkMipMap* FindAndRef(const SkBitmap& src);
56    static void Add(const SkBitmap& src, const SkMipMap* result);
57};
58
59#endif
60