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 SkImageFilter; 16 class SkSpecialImage; 17 18 struct SkImageFilterCacheKey { 19 SkImageFilterCacheKey(const uint32_t uniqueID, const SkMatrix& matrix, 20 const SkIRect& clipBounds, uint32_t srcGenID, const SkIRect& srcSubset) 21 : fUniqueID(uniqueID) 22 , fMatrix(matrix) 23 , fClipBounds(clipBounds) 24 , fSrcGenID(srcGenID) 25 , fSrcSubset(srcSubset) { 26 // Assert that Key is tightly-packed, since it is hashed. 27 static_assert(sizeof(SkImageFilterCacheKey) == sizeof(uint32_t) + sizeof(SkMatrix) + 28 sizeof(SkIRect) + sizeof(uint32_t) + 4 * sizeof(int32_t), 29 "image_filter_key_tight_packing"); 30 fMatrix.getType(); // force initialization of type, so hashes match 31 SkASSERT(fMatrix.isFinite()); // otherwise we can't rely on == self when comparing keys 32 } 33 34 uint32_t fUniqueID; 35 SkMatrix fMatrix; 36 SkIRect fClipBounds; 37 uint32_t fSrcGenID; 38 SkIRect fSrcSubset; 39 40 bool operator==(const SkImageFilterCacheKey& other) const { 41 return fUniqueID == other.fUniqueID && 42 fMatrix == other.fMatrix && 43 fClipBounds == other.fClipBounds && 44 fSrcGenID == other.fSrcGenID && 45 fSrcSubset == other.fSrcSubset; 46 } 47 }; 48 49 // This cache maps from (filter's unique ID + CTM + clipBounds + src bitmap generation ID) to 50 // (result, offset). 51 class SkImageFilterCache : public SkRefCnt { 52 public: 53 enum { kDefaultTransientSize = 32 * 1024 * 1024 }; 54 55 virtual ~SkImageFilterCache() {} 56 static SkImageFilterCache* Create(size_t maxBytes); 57 static SkImageFilterCache* Get(); 58 virtual sk_sp<SkSpecialImage> get(const SkImageFilterCacheKey& key, SkIPoint* offset) const = 0; 59 virtual void set(const SkImageFilterCacheKey& key, SkSpecialImage* image, 60 const SkIPoint& offset, const SkImageFilter* filter) = 0; 61 virtual void purge() = 0; 62 virtual void purgeByKeys(const SkImageFilterCacheKey[], int) = 0; 63 SkDEBUGCODE(virtual int count() const = 0;) 64 }; 65 66 #endif 67
