1 /* 2 * Copyright 2016 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 SkImageFilterCache_DEFINED 9 #define SkImageFilterCache_DEFINED 10 11 #include "SkMatrix.h" 12 #include "SkRefCnt.h" 13 14 struct SkIPoint; 15 class SkSpecialImage; 16 17 struct SkImageFilterCacheKey { SkImageFilterCacheKeySkImageFilterCacheKey18 SkImageFilterCacheKey(const uint32_t uniqueID, const SkMatrix& matrix, 19 const SkIRect& clipBounds, uint32_t srcGenID, const SkIRect& srcSubset) 20 : fUniqueID(uniqueID) 21 , fMatrix(matrix) 22 , fClipBounds(clipBounds) 23 , fSrcGenID(srcGenID) 24 , fSrcSubset(srcSubset) { 25 // Assert that Key is tightly-packed, since it is hashed. 26 static_assert(sizeof(SkImageFilterCacheKey) == sizeof(uint32_t) + sizeof(SkMatrix) + 27 sizeof(SkIRect) + sizeof(uint32_t) + 4 * sizeof(int32_t), 28 "image_filter_key_tight_packing"); 29 fMatrix.getType(); // force initialization of type, so hashes match 30 } 31 32 uint32_t fUniqueID; 33 SkMatrix fMatrix; 34 SkIRect fClipBounds; 35 uint32_t fSrcGenID; 36 SkIRect fSrcSubset; 37 38 bool operator==(const SkImageFilterCacheKey& other) const { 39 return fUniqueID == other.fUniqueID && 40 fMatrix == other.fMatrix && 41 fClipBounds == other.fClipBounds && 42 fSrcGenID == other.fSrcGenID && 43 fSrcSubset == other.fSrcSubset; 44 } 45 }; 46 47 // This cache maps from (filter's unique ID + CTM + clipBounds + src bitmap generation ID) to 48 // (result, offset). 49 class SkImageFilterCache : public SkRefCnt { 50 public: 51 enum { kDefaultTransientSize = 32 * 1024 * 1024 }; 52 ~SkImageFilterCache()53 virtual ~SkImageFilterCache() {} 54 static SkImageFilterCache* Create(size_t maxBytes); 55 static SkImageFilterCache* Get(); 56 virtual sk_sp<SkSpecialImage> get(const SkImageFilterCacheKey& key, SkIPoint* offset) const = 0; 57 virtual void set(const SkImageFilterCacheKey& key, SkSpecialImage* image, 58 const SkIPoint& offset) = 0; 59 virtual void purge() = 0; 60 virtual void purgeByKeys(const SkImageFilterCacheKey[], int) = 0; 61 SkDEBUGCODE(virtual int count() const = 0;) 62 }; 63 64 #endif 65