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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 "SkRect.h"
     12 #include <memory>
     13 
     14 class SkBitmap;
     15 class SkBitmapProvider;
     16 class SkImage;
     17 struct SkImageInfo;
     18 class SkMipMap;
     19 class SkPixmap;
     20 class SkResourceCache;
     21 
     22 uint64_t SkMakeResourceCacheSharedIDForBitmap(uint32_t bitmapGenID);
     23 
     24 void SkNotifyBitmapGenIDIsStale(uint32_t bitmapGenID);
     25 
     26 struct SkBitmapCacheDesc {
     27     uint32_t    fImageID;       // != 0
     28     SkIRect     fSubset;        // always set to a valid rect (entire or subset)
     29 
     30     void validate() const {
     31         SkASSERT(fImageID);
     32         SkASSERT(fSubset.fLeft >= 0 && fSubset.fTop >= 0);
     33         SkASSERT(fSubset.width() > 0 && fSubset.height() > 0);
     34     }
     35 
     36     static SkBitmapCacheDesc Make(const SkImage*);
     37     static SkBitmapCacheDesc Make(uint32_t genID, const SkIRect& subset);
     38 };
     39 
     40 class SkBitmapCache {
     41 public:
     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 Find(const SkBitmapCacheDesc&, SkBitmap* result);
     47 
     48     class Rec;
     49     struct RecDeleter { void operator()(Rec* r) { PrivateDeleteRec(r); } };
     50     typedef std::unique_ptr<Rec, RecDeleter> RecPtr;
     51 
     52     static RecPtr Alloc(const SkBitmapCacheDesc&, const SkImageInfo&, SkPixmap*);
     53     static void Add(RecPtr, SkBitmap*);
     54 
     55 private:
     56     static void PrivateDeleteRec(Rec*);
     57 };
     58 
     59 class SkMipMapCache {
     60 public:
     61     static const SkMipMap* FindAndRef(const SkBitmapCacheDesc&,
     62                                       SkResourceCache* localCache = nullptr);
     63     static const SkMipMap* AddAndRef(const SkBitmapProvider&,
     64                                      SkResourceCache* localCache = nullptr);
     65 };
     66 
     67 #endif
     68