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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 SkResourceCache;
     15 class SkMipMap;
     16 
     17 uint64_t SkMakeResourceCacheSharedIDForBitmap(uint32_t bitmapGenID);
     18 
     19 void SkNotifyBitmapGenIDIsStale(uint32_t bitmapGenID);
     20 
     21 class SkBitmapCache {
     22 public:
     23     /**
     24      * Use this allocator for bitmaps, so they can use ashmem when available.
     25      * Returns NULL if the ResourceCache has not been initialized with a DiscardableFactory.
     26      */
     27     static SkBitmap::Allocator* GetAllocator();
     28 
     29     /**
     30      *  Search based on the src bitmap and inverse scales in X and Y. If found, returns true and
     31      *  result will be set to the matching bitmap with its pixels already locked.
     32      */
     33     static bool Find(const SkBitmap& src, SkScalar invScaleX, SkScalar invScaleY, SkBitmap* result,
     34                      SkResourceCache* localCache = NULL);
     35 
     36     /*
     37      *  result must be marked isImmutable()
     38      */
     39     static void Add(const SkBitmap& src, SkScalar invScaleX, SkScalar invScaleY,
     40             const SkBitmap& result, SkResourceCache* localCache = NULL);
     41 
     42     /**
     43      *  Search based on the bitmap's genID and subset. If found, returns true and
     44      *  result will be set to the matching bitmap with its pixels already locked.
     45      */
     46     static bool Find(uint32_t genID, const SkIRect& subset, SkBitmap* result,
     47                      SkResourceCache* localCache = NULL);
     48 
     49     /**
     50      * The width and the height of the provided subset must be the same as the result bitmap ones.
     51      * result must be marked isImmutable()
     52      */
     53     static bool Add(SkPixelRef*, const SkIRect& subset, const SkBitmap& result,
     54                     SkResourceCache* localCache = NULL);
     55 };
     56 
     57 class SkMipMapCache {
     58 public:
     59     static const SkMipMap* FindAndRef(const SkBitmap& src, SkResourceCache* localCache = NULL);
     60     static const SkMipMap* AddAndRef(const SkBitmap& src, SkResourceCache* localCache = NULL);
     61 };
     62 
     63 #endif
     64