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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkImageFilterCache_DEFINED
#define SkImageFilterCache_DEFINED
#include "include/core/SkMatrix.h"
#include "include/core/SkRefCnt.h"
#include "src/core/SkImageFilterTypes.h"
struct SkIPoint;
class SkImageFilter;
struct SkImageFilterCacheKey {
SkImageFilterCacheKey(const uint32_t uniqueID, const SkMatrix& matrix,
const SkIRect& clipBounds, uint32_t srcGenID, const SkIRect& srcSubset)
: fUniqueID(uniqueID)
, fMatrix(matrix)
, fClipBounds(clipBounds)
, fSrcGenID(srcGenID)
, fSrcSubset(srcSubset) {
// Assert that Key is tightly-packed, since it is hashed.
static_assert(sizeof(SkImageFilterCacheKey) == sizeof(uint32_t) + sizeof(SkMatrix) +
sizeof(SkIRect) + sizeof(uint32_t) + 4 * sizeof(int32_t),
"image_filter_key_tight_packing");
fMatrix.getType(); // force initialization of type, so hashes match
SkASSERT(fMatrix.isFinite()); // otherwise we can't rely on == self when comparing keys
}
uint32_t fUniqueID;
SkMatrix fMatrix;
SkIRect fClipBounds;
uint32_t fSrcGenID;
SkIRect fSrcSubset;
bool operator==(const SkImageFilterCacheKey& other) const {
return fUniqueID == other.fUniqueID &&
fMatrix == other.fMatrix &&
fClipBounds == other.fClipBounds &&
fSrcGenID == other.fSrcGenID &&
fSrcSubset == other.fSrcSubset;
}
};
// This cache maps from (filter's unique ID + CTM + clipBounds + src bitmap generation ID) to result
// NOTE: this is the _specific_ unique ID of the image filter, so refiltering the same image with a
// copy of the image filter (with exactly the same parameters) will not yield a cache hit.
class SkImageFilterCache : public SkRefCnt {
public:
enum { kDefaultTransientSize = 32 * 1024 * 1024 };
~SkImageFilterCache() override {}
static SkImageFilterCache* Create(size_t maxBytes);
static SkImageFilterCache* Get();
// Returns true on cache hit and updates 'result' to be the cached result. Returns false when
// not in the cache, in which case 'result' is not modified.
virtual bool get(const SkImageFilterCacheKey& key,
skif::FilterResult* result) const = 0;
// 'filter' is included in the caching to allow the purging of all of an image filter's cached
// results when it is destroyed.
virtual void set(const SkImageFilterCacheKey& key, const SkImageFilter* filter,
const skif::FilterResult& result) = 0;
virtual void purge() = 0;
virtual void purgeByImageFilter(const SkImageFilter*) = 0;
SkDEBUGCODE(virtual int count() const = 0;)
};
#endif
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