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| 1 |
| 2 /* |
| 3 * Copyright 2014 Google Inc. |
| 4 * |
| 5 * Use of this source code is governed by a BSD-style license that can be |
| 6 * found in the LICENSE file. |
| 7 */ |
| 8 |
| 9 #ifndef GrResourceKey_DEFINED |
| 10 #define GrResourceKey_DEFINED |
| 11 |
| 12 #include "GrTypes.h" |
| 13 #include "GrBinHashKey.h" |
| 14 |
| 15 class GrResourceKey { |
| 16 public: |
| 17 static GrCacheID::Domain ScratchDomain() { |
| 18 static const GrCacheID::Domain gDomain = GrCacheID::GenerateDomain(); |
| 19 return gDomain; |
| 20 } |
| 21 |
| 22 /** Uniquely identifies the GrGpuResource subclass in the key to avoid colli
sions |
| 23 across resource types. */ |
| 24 typedef uint8_t ResourceType; |
| 25 |
| 26 /** Flags set by the GrGpuResource subclass. */ |
| 27 typedef uint8_t ResourceFlags; |
| 28 |
| 29 /** Generate a unique ResourceType */ |
| 30 static ResourceType GenerateResourceType(); |
| 31 |
| 32 /** Creates a key for resource */ |
| 33 GrResourceKey(const GrCacheID& id, ResourceType type, ResourceFlags flags) { |
| 34 this->init(id.getDomain(), id.getKey(), type, flags); |
| 35 }; |
| 36 |
| 37 GrResourceKey(const GrResourceKey& src) { fKey = src.fKey; } |
| 38 |
| 39 GrResourceKey() { fKey.reset(); } |
| 40 |
| 41 void reset(const GrCacheID& id, ResourceType type, ResourceFlags flags) { |
| 42 this->init(id.getDomain(), id.getKey(), type, flags); |
| 43 } |
| 44 |
| 45 uint32_t getHash() const { return fKey.getHash(); } |
| 46 |
| 47 bool isScratch() const { |
| 48 return ScratchDomain() == |
| 49 *reinterpret_cast<const GrCacheID::Domain*>(fKey.getData() + |
| 50 kCacheIDDomainOffset); |
| 51 } |
| 52 |
| 53 ResourceType getResourceType() const { |
| 54 return *reinterpret_cast<const ResourceType*>(fKey.getData() + |
| 55 kResourceTypeOffset); |
| 56 } |
| 57 |
| 58 ResourceFlags getResourceFlags() const { |
| 59 return *reinterpret_cast<const ResourceFlags*>(fKey.getData() + |
| 60 kResourceFlagsOffset); |
| 61 } |
| 62 |
| 63 bool operator==(const GrResourceKey& other) const { return fKey == other.fKe
y; } |
| 64 |
| 65 // A key indicating that the resource is not usable as a scratch resource. |
| 66 static GrResourceKey& NullScratchKey() { |
| 67 static const GrCacheID::Key kBogusKey = { { {0} } }; |
| 68 static GrCacheID kBogusID(ScratchDomain(), kBogusKey); |
| 69 static GrResourceKey kNullScratchKey(kBogusID, NoneResourceType(), 0); |
| 70 return kNullScratchKey; |
| 71 } |
| 72 |
| 73 bool isNullScratch() const { |
| 74 return this->isScratch() && NoneResourceType() == this->getResourceType(
); |
| 75 } |
| 76 |
| 77 private: |
| 78 enum { |
| 79 kCacheIDKeyOffset = 0, |
| 80 kCacheIDDomainOffset = kCacheIDKeyOffset + sizeof(GrCacheID::Key), |
| 81 kResourceTypeOffset = kCacheIDDomainOffset + sizeof(GrCacheID::Domain), |
| 82 kResourceFlagsOffset = kResourceTypeOffset + sizeof(ResourceType), |
| 83 kPadOffset = kResourceFlagsOffset + sizeof(ResourceFlags), |
| 84 kKeySize = SkAlign4(kPadOffset), |
| 85 kPadSize = kKeySize - kPadOffset |
| 86 }; |
| 87 |
| 88 static ResourceType NoneResourceType() { |
| 89 static const ResourceType gNoneResourceType = GenerateResourceType(); |
| 90 return gNoneResourceType; |
| 91 } |
| 92 |
| 93 void init(const GrCacheID::Domain domain, |
| 94 const GrCacheID::Key& key, |
| 95 ResourceType type, |
| 96 ResourceFlags flags) { |
| 97 union { |
| 98 uint8_t fKey8[kKeySize]; |
| 99 uint32_t fKey32[kKeySize / 4]; |
| 100 } keyData; |
| 101 |
| 102 uint8_t* k = keyData.fKey8; |
| 103 memcpy(k + kCacheIDKeyOffset, key.fData8, sizeof(GrCacheID::Key)); |
| 104 memcpy(k + kCacheIDDomainOffset, &domain, sizeof(GrCacheID::Domain)); |
| 105 memcpy(k + kResourceTypeOffset, &type, sizeof(ResourceType)); |
| 106 memcpy(k + kResourceFlagsOffset, &flags, sizeof(ResourceFlags)); |
| 107 memset(k + kPadOffset, 0, kPadSize); |
| 108 fKey.setKeyData(keyData.fKey32); |
| 109 } |
| 110 GrBinHashKey<kKeySize> fKey; |
| 111 }; |
| 112 |
| 113 #endif |
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