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 "SkBitmap.h"
12#include "SkMipMap.h"
13
14class SkImage;
15class SkResourceCache;
16
17uint64_t SkMakeResourceCacheSharedIDForBitmap(uint32_t bitmapGenID);
18
19void SkNotifyBitmapGenIDIsStale(uint32_t bitmapGenID);
20
21struct SkBitmapCacheDesc {
22    uint32_t    fImageID;       // != 0
23    int32_t     fScaledWidth;   // 0 for unscaled
24    int32_t     fScaledHeight;  // 0 for unscaled
25    SkIRect     fSubset;        // always set to a valid rect (entire or subset)
26
27    void validate() const {
28        SkASSERT(fImageID);
29        if (fScaledWidth || fScaledHeight) {
30            SkASSERT(fScaledWidth && fScaledHeight);
31        }
32        SkASSERT(fSubset.fLeft >= 0 && fSubset.fTop >= 0);
33        SkASSERT(fSubset.width() > 0 && fSubset.height() > 0);
34    }
35
36    static SkBitmapCacheDesc Make(const SkBitmap&, int scaledWidth, int scaledHeight);
37    static SkBitmapCacheDesc Make(const SkBitmap&);
38    static SkBitmapCacheDesc Make(const SkImage*, int scaledWidth, int scaledHeight);
39    static SkBitmapCacheDesc Make(const SkImage*);
40
41    // Use with care -- width/height must match the original bitmap/image
42    static SkBitmapCacheDesc Make(uint32_t genID, int origWidth, int origHeight);
43};
44
45class SkBitmapCache {
46public:
47    /**
48     *  Search based on the desc. If found, returns true and
49     *  result will be set to the matching bitmap with its pixels already locked.
50     */
51    static bool Find(const SkBitmapCacheDesc&, SkBitmap* result);
52
53    class Rec;
54    struct RecDeleter { void operator()(Rec* r) { PrivateDeleteRec(r); } };
55    typedef std::unique_ptr<Rec, RecDeleter> RecPtr;
56
57    static RecPtr Alloc(const SkBitmapCacheDesc&, const SkImageInfo&, SkPixmap*);
58    static void Add(RecPtr, SkBitmap*);
59
60private:
61    static void PrivateDeleteRec(Rec*);
62};
63
64class SkMipMapCache {
65public:
66    // Note: the scaled width/height in desc must be 0, as any other value would not make sense.
67    static const SkMipMap* FindAndRef(const SkBitmapCacheDesc&, SkDestinationSurfaceColorMode,
68                                      SkResourceCache* localCache = nullptr);
69    static const SkMipMap* AddAndRef(const SkBitmap& src, SkDestinationSurfaceColorMode,
70                                     SkResourceCache* localCache = nullptr);
71};
72
73#endif
74