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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGpuResourceCacheAccess_DEFINED
#define GrGpuResourceCacheAccess_DEFINED
#include "GrGpuResource.h"
/**
* This class allows code internal to Skia privileged access to manage the cache keys of a
* GrGpuResource object.
*/
class GrGpuResource::CacheAccess {
public:
/**
* Sets a content key for the resource. If the resource was previously cached as scratch it will
* be converted to a content resource. Currently this may only be called once per resource. It
* fails if there is already a resource with the same content key. TODO: make this supplant the
* resource that currently is using the content key, allow resources' content keys to change,
* and allow removal of a content key to convert a resource back to scratch.
*/
bool setContentKey(const GrResourceKey& contentKey) {
return fResource->setContentKey(contentKey);
}
/**
* Used by legacy cache to attach a cache entry. This is to be removed soon.
*/
void setCacheEntry(GrResourceCacheEntry* cacheEntry) {
// GrResourceCache never changes the cacheEntry once one has been added.
SkASSERT(NULL == cacheEntry || NULL == fResource->fCacheEntry);
fResource->fCacheEntry = cacheEntry;
}
/**
* Is the resource in the legacy cache? This is to be removed soon.
*/
bool isInCache() const { return SkToBool(fResource->fCacheEntry); }
/**
* Returns the cache entry for the legacy cache. This is to be removed soon.
*/
GrResourceCacheEntry* getCacheEntry() const { return fResource->fCacheEntry; }
/**
* Is the resource currently cached as scratch? This means it has a valid scratch key and does
* not have a content key.
*/
bool isScratch() const {
SkASSERT(fResource->fScratchKey.isScratch());
return NULL == this->getContentKey() && !fResource->fScratchKey.isNullScratch();
}
/**
* If this resource can be used as a scratch resource this returns a valid scratch key.
* Otherwise it returns a key for which isNullScratch is true. The resource may currently be
* used as content resource rather than scratch. Check isScratch().
*/
const GrResourceKey& getScratchKey() const { return fResource->fScratchKey; }
/**
* If the resource is currently cached by a content key, the key is returned, otherwise NULL.
*/
const GrResourceKey* getContentKey() const {
if (fResource->fContentKeySet) {
return &fResource->fContentKey;
}
return NULL;
}
private:
CacheAccess(GrGpuResource* resource) : fResource(resource) { }
CacheAccess(const CacheAccess& that) : fResource(that.fResource) { }
CacheAccess& operator=(const CacheAccess&); // unimpl
// No taking addresses of this type.
const CacheAccess* operator&() const;
CacheAccess* operator&();
GrGpuResource* fResource;
friend class GrGpuResource; // to construct/copy this type.
};
inline GrGpuResource::CacheAccess GrGpuResource::cacheAccess() { return CacheAccess(this); }
inline const GrGpuResource::CacheAccess GrGpuResource::cacheAccess() const {
return CacheAccess(const_cast<GrGpuResource*>(this));
}
#endif
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