103 lines
3.3 KiB
C++
103 lines
3.3 KiB
C++
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/*
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* Copyright 2014 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 GrResourceKey_DEFINED
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#define GrResourceKey_DEFINED
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#include "GrTypes.h"
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#include "GrBinHashKey.h"
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class GrResourceKey {
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public:
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static GrCacheID::Domain ScratchDomain();
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/** Uniquely identifies the GrGpuResource subclass in the key to avoid collisions
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across resource types. */
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typedef uint8_t ResourceType;
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/** Flags set by the GrGpuResource subclass. */
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typedef uint8_t ResourceFlags;
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/** Generate a unique ResourceType */
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static ResourceType GenerateResourceType();
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/** Creates a key for resource */
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GrResourceKey(const GrCacheID& id, ResourceType type, ResourceFlags flags) {
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this->init(id.getDomain(), id.getKey(), type, flags);
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};
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GrResourceKey(const GrResourceKey& src) { fKey = src.fKey; }
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GrResourceKey() { fKey.reset(); }
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void reset(const GrCacheID& id, ResourceType type, ResourceFlags flags) {
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this->init(id.getDomain(), id.getKey(), type, flags);
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}
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uint32_t getHash() const { return fKey.getHash(); }
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bool isScratch() const {
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return ScratchDomain() ==
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*reinterpret_cast<const GrCacheID::Domain*>(fKey.getData() +
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kCacheIDDomainOffset);
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}
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ResourceType getResourceType() const {
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return *reinterpret_cast<const ResourceType*>(fKey.getData() +
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kResourceTypeOffset);
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}
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ResourceFlags getResourceFlags() const {
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return *reinterpret_cast<const ResourceFlags*>(fKey.getData() +
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kResourceFlagsOffset);
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}
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bool operator==(const GrResourceKey& other) const { return fKey == other.fKey; }
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// A key indicating that the resource is not usable as a scratch resource.
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static GrResourceKey& NullScratchKey();
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bool isNullScratch() const {
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return this->isScratch() && NoneResourceType() == this->getResourceType();
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}
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private:
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enum {
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kCacheIDKeyOffset = 0,
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kCacheIDDomainOffset = kCacheIDKeyOffset + sizeof(GrCacheID::Key),
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kResourceTypeOffset = kCacheIDDomainOffset + sizeof(GrCacheID::Domain),
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kResourceFlagsOffset = kResourceTypeOffset + sizeof(ResourceType),
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kPadOffset = kResourceFlagsOffset + sizeof(ResourceFlags),
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kKeySize = SkAlign4(kPadOffset),
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kPadSize = kKeySize - kPadOffset
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};
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static ResourceType NoneResourceType();
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void init(const GrCacheID::Domain domain,
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const GrCacheID::Key& key,
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ResourceType type,
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ResourceFlags flags) {
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union {
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uint8_t fKey8[kKeySize];
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uint32_t fKey32[kKeySize / 4];
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} keyData;
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uint8_t* k = keyData.fKey8;
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memcpy(k + kCacheIDKeyOffset, key.fData8, sizeof(GrCacheID::Key));
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memcpy(k + kCacheIDDomainOffset, &domain, sizeof(GrCacheID::Domain));
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memcpy(k + kResourceTypeOffset, &type, sizeof(ResourceType));
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memcpy(k + kResourceFlagsOffset, &flags, sizeof(ResourceFlags));
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memset(k + kPadOffset, 0, kPadSize);
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fKey.setKeyData(keyData.fKey32);
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}
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GrBinHashKey<kKeySize> fKey;
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};
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#endif
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