1 /* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SkMetaData_DEFINED 18 #define SkMetaData_DEFINED 19 20 #include "SkScalar.h" 21 22 class SkRefCnt; 23 24 class SK_API SkMetaData { 25 public: 26 /** 27 * Used to manage the life-cycle of a ptr in the metadata. This is option 28 * in setPtr, and is only invoked when either copying one metadata to 29 * another, or when the metadata is destroyed. 30 * 31 * setPtr(name, ptr, proc) { 32 * fPtr = proc(ptr, true); 33 * } 34 * 35 * copy: A = B { 36 * A.fPtr = B.fProc(B.fPtr, true); 37 * } 38 * 39 * ~SkMetaData { 40 * fProc(fPtr, false); 41 * } 42 */ 43 typedef void* (*PtrProc)(void* ptr, bool doRef); 44 45 /** 46 * Implements PtrProc for SkRefCnt pointers 47 */ 48 static void* RefCntProc(void* ptr, bool doRef); 49 50 SkMetaData(); 51 SkMetaData(const SkMetaData& src); 52 ~SkMetaData(); 53 54 SkMetaData& operator=(const SkMetaData& src); 55 56 void reset(); 57 58 bool findS32(const char name[], int32_t* value = NULL) const; 59 bool findScalar(const char name[], SkScalar* value = NULL) const; 60 const SkScalar* findScalars(const char name[], int* count, 61 SkScalar values[] = NULL) const; 62 const char* findString(const char name[]) const; 63 bool findPtr(const char name[], void** value = NULL, PtrProc* = NULL) const; 64 bool findBool(const char name[], bool* value = NULL) const; 65 const void* findData(const char name[], size_t* byteCount = NULL) const; 66 67 bool hasS32(const char name[], int32_t value) const { 68 int32_t v; 69 return this->findS32(name, &v) && v == value; 70 } 71 bool hasScalar(const char name[], SkScalar value) const { 72 SkScalar v; 73 return this->findScalar(name, &v) && v == value; 74 } 75 bool hasString(const char name[], const char value[]) const { 76 const char* v = this->findString(name); 77 return (v == NULL && value == NULL) || 78 (v != NULL && value != NULL && !strcmp(v, value)); 79 } 80 bool hasPtr(const char name[], void* value) const { 81 void* v; 82 return this->findPtr(name, &v) && v == value; 83 } 84 bool hasBool(const char name[], bool value) const { 85 bool v; 86 return this->findBool(name, &v) && v == value; 87 } 88 bool hasData(const char name[], const void* data, size_t byteCount) const { 89 size_t len; 90 const void* ptr = this->findData(name, &len); 91 return NULL != ptr && len == byteCount && !memcmp(ptr, data, len); 92 } 93 94 void setS32(const char name[], int32_t value); 95 void setScalar(const char name[], SkScalar value); 96 SkScalar* setScalars(const char name[], int count, const SkScalar values[] = NULL); 97 void setString(const char name[], const char value[]); 98 void setPtr(const char name[], void* value, PtrProc proc = NULL); 99 void setBool(const char name[], bool value); 100 // the data is copied from the input pointer. 101 void setData(const char name[], const void* data, size_t byteCount); 102 103 bool removeS32(const char name[]); 104 bool removeScalar(const char name[]); 105 bool removeString(const char name[]); 106 bool removePtr(const char name[]); 107 bool removeBool(const char name[]); 108 bool removeData(const char name[]); 109 110 // helpers for SkRefCnt 111 bool findRefCnt(const char name[], SkRefCnt** ptr = NULL) { 112 return this->findPtr(name, reinterpret_cast<void**>(ptr)); 113 } 114 bool hasRefCnt(const char name[], SkRefCnt* ptr) { 115 return this->hasPtr(name, ptr); 116 } 117 void setRefCnt(const char name[], SkRefCnt* ptr) { 118 this->setPtr(name, ptr, RefCntProc); 119 } 120 bool removeRefCnt(const char name[]) { 121 return this->removePtr(name); 122 } 123 124 enum Type { 125 kS32_Type, 126 kScalar_Type, 127 kString_Type, 128 kPtr_Type, 129 kBool_Type, 130 kData_Type, 131 132 kTypeCount 133 }; 134 135 struct Rec; 136 class Iter; 137 friend class Iter; 138 139 class Iter { 140 public: 141 Iter() : fRec(NULL) {} 142 Iter(const SkMetaData&); 143 144 /** Reset the iterator, so that calling next() will return the first 145 data element. This is done implicitly in the constructor. 146 */ 147 void reset(const SkMetaData&); 148 149 /** Each time next is called, it returns the name of the next data element, 150 or null when there are no more elements. If non-null is returned, then the 151 element's type is returned (if not null), and the number of data values 152 is returned in count (if not null). 153 */ 154 const char* next(Type*, int* count); 155 156 private: 157 Rec* fRec; 158 }; 159 160 public: 161 struct Rec { 162 Rec* fNext; 163 uint16_t fDataCount; // number of elements 164 uint8_t fDataLen; // sizeof a single element 165 uint8_t fType; 166 167 const void* data() const { return (this + 1); } 168 void* data() { return (this + 1); } 169 const char* name() const { return (const char*)this->data() + fDataLen * fDataCount; } 170 char* name() { return (char*)this->data() + fDataLen * fDataCount; } 171 172 static Rec* Alloc(size_t); 173 static void Free(Rec*); 174 }; 175 Rec* fRec; 176 177 const Rec* find(const char name[], Type) const; 178 void* set(const char name[], const void* data, size_t len, Type, int count); 179 bool remove(const char name[], Type); 180 }; 181 182 #endif 183 184
