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      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 
     14 class SkImage;
     15 class SkResourceCache;
     16 class SkMipMap;
     17 
     18 uint64_t SkMakeResourceCacheSharedIDForBitmap(uint32_t bitmapGenID);
     19 
     20 void SkNotifyBitmapGenIDIsStale(uint32_t bitmapGenID);
     21 
     22 struct SkBitmapCacheDesc {
     23     uint32_t    fImageID;
     24     int32_t     fWidth;
     25     int32_t     fHeight;
     26     SkIRect     fBounds;
     27 
     28     static SkBitmapCacheDesc Make(const SkBitmap&, int width, int height);
     29     static SkBitmapCacheDesc Make(const SkBitmap&);
     30     static SkBitmapCacheDesc Make(const SkImage*, int width, int height);
     31     static SkBitmapCacheDesc Make(const SkImage*);
     32 };
     33 
     34 class SkBitmapCache {
     35 public:
     36     /**
     37      * Use this allocator for bitmaps, so they can use ashmem when available.
     38      * Returns nullptr if the ResourceCache has not been initialized with a DiscardableFactory.
     39      */
     40     static SkBitmap::Allocator* GetAllocator();
     41 
     42     /**
     43      *  Search based on the desc. If found, returns true and
     44      *  result will be set to the matching bitmap with its pixels already locked.
     45      */
     46     static bool FindWH(const SkBitmapCacheDesc&, SkBitmap* result,
     47                        SkResourceCache* localCache = nullptr);
     48 
     49     /*
     50      *  result must be marked isImmutable()
     51      */
     52     static bool AddWH(const SkBitmapCacheDesc&, const SkBitmap& result,
     53                       SkResourceCache* localCache = nullptr);
     54 
     55     /**
     56      *  Search based on the bitmap's genID and subset. If found, returns true and
     57      *  result will be set to the matching bitmap with its pixels already locked.
     58      */
     59     static bool Find(uint32_t genID, const SkIRect& subset, SkBitmap* result,
     60                      SkResourceCache* localCache = nullptr);
     61 
     62     /**
     63      * The width and the height of the provided subset must be the same as the result bitmap ones.
     64      * result must be marked isImmutable()
     65      */
     66     static bool Add(SkPixelRef*, const SkIRect& subset, const SkBitmap& result,
     67                     SkResourceCache* localCache = nullptr);
     68 
     69     static bool Find(uint32_t genID, SkBitmap* result, SkResourceCache* localCache = nullptr);
     70     // todo: eliminate the need to specify ID, since it should == the bitmap's
     71     static void Add(uint32_t genID, const SkBitmap&, SkResourceCache* localCache = nullptr);
     72 };
     73 
     74 class SkMipMapCache {
     75 public:
     76     static const SkMipMap* FindAndRef(const SkBitmapCacheDesc&,
     77                                       SkResourceCache* localCache = nullptr);
     78     static const SkMipMap* AddAndRef(const SkBitmap& src, SkResourceCache* localCache = nullptr);
     79 };
     80 
     81 #endif
     82