/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkImageFilterCache_DEFINED
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#define SkImageFilterCache_DEFINED
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#include "SkMatrix.h"
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#include "SkRefCnt.h"
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struct SkIPoint;
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class SkImageFilter;
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class SkSpecialImage;
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struct SkImageFilterCacheKey {
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SkImageFilterCacheKey(const uint32_t uniqueID, const SkMatrix& matrix,
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const SkIRect& clipBounds, uint32_t srcGenID, const SkIRect& srcSubset)
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: fUniqueID(uniqueID)
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, fMatrix(matrix)
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, fClipBounds(clipBounds)
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, fSrcGenID(srcGenID)
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, fSrcSubset(srcSubset) {
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// Assert that Key is tightly-packed, since it is hashed.
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static_assert(sizeof(SkImageFilterCacheKey) == sizeof(uint32_t) + sizeof(SkMatrix) +
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sizeof(SkIRect) + sizeof(uint32_t) + 4 * sizeof(int32_t),
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"image_filter_key_tight_packing");
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fMatrix.getType(); // force initialization of type, so hashes match
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SkASSERT(fMatrix.isFinite()); // otherwise we can't rely on == self when comparing keys
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}
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uint32_t fUniqueID;
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SkMatrix fMatrix;
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SkIRect fClipBounds;
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uint32_t fSrcGenID;
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SkIRect fSrcSubset;
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bool operator==(const SkImageFilterCacheKey& other) const {
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return fUniqueID == other.fUniqueID &&
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fMatrix == other.fMatrix &&
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fClipBounds == other.fClipBounds &&
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fSrcGenID == other.fSrcGenID &&
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fSrcSubset == other.fSrcSubset;
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}
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};
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// This cache maps from (filter's unique ID + CTM + clipBounds + src bitmap generation ID) to
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// (result, offset).
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class SkImageFilterCache : public SkRefCnt {
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public:
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enum { kDefaultTransientSize = 32 * 1024 * 1024 };
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virtual ~SkImageFilterCache() {}
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static SkImageFilterCache* Create(size_t maxBytes);
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static SkImageFilterCache* Get();
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virtual sk_sp<SkSpecialImage> get(const SkImageFilterCacheKey& key, SkIPoint* offset) const = 0;
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virtual void set(const SkImageFilterCacheKey& key, SkSpecialImage* image,
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const SkIPoint& offset, const SkImageFilter* filter) = 0;
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virtual void purge() = 0;
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virtual void purgeByImageFilter(const SkImageFilter*) = 0;
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SkDEBUGCODE(virtual int count() const = 0;)
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};
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#endif
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