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 SkMetaData { 23 public: 24 SkMetaData(); 25 SkMetaData(const SkMetaData& src); 26 ~SkMetaData(); 27 28 SkMetaData& operator=(const SkMetaData& src); 29 30 void reset(); 31 32 bool findS32(const char name[], int32_t* value = NULL) const; 33 bool findScalar(const char name[], SkScalar* value = NULL) const; 34 const SkScalar* findScalars(const char name[], int* count, SkScalar values[] = NULL) const; 35 const char* findString(const char name[]) const; 36 bool findPtr(const char name[], void** value = NULL) const; 37 bool findBool(const char name[], bool* value = NULL) const; 38 hasS32(const char name[],int32_t value)39 bool hasS32(const char name[], int32_t value) const 40 { 41 int32_t v; 42 return this->findS32(name, &v) && v == value; 43 } hasScalar(const char name[],SkScalar value)44 bool hasScalar(const char name[], SkScalar value) const 45 { 46 SkScalar v; 47 return this->findScalar(name, &v) && v == value; 48 } hasString(const char name[],const char value[])49 bool hasString(const char name[], const char value[]) const 50 { 51 const char* v = this->findString(name); 52 return v == NULL && value == NULL || 53 v != NULL && value != NULL && !strcmp(v, value); 54 } hasPtr(const char name[],void * value)55 bool hasPtr(const char name[], void* value) const 56 { 57 void* v; 58 return this->findPtr(name, &v) && v == value; 59 } hasBool(const char name[],bool value)60 bool hasBool(const char name[], bool value) const 61 { 62 bool v; 63 return this->findBool(name, &v) && v == value; 64 } 65 66 void setS32(const char name[], int32_t value); 67 void setScalar(const char name[], SkScalar value); 68 SkScalar* setScalars(const char name[], int count, const SkScalar values[] = NULL); 69 void setString(const char name[], const char value[]); 70 void setPtr(const char name[], void* value); 71 void setBool(const char name[], bool value); 72 73 bool removeS32(const char name[]); 74 bool removeScalar(const char name[]); 75 bool removeString(const char name[]); 76 bool removePtr(const char name[]); 77 bool removeBool(const char name[]); 78 79 SkDEBUGCODE(static void UnitTest();) 80 81 enum Type { 82 kS32_Type, 83 kScalar_Type, 84 kString_Type, 85 kPtr_Type, 86 kBool_Type, 87 88 kTypeCount 89 }; 90 91 struct Rec; 92 class Iter; 93 friend class Iter; 94 95 class Iter { 96 public: Iter()97 Iter() : fRec(NULL) {} 98 Iter(const SkMetaData&); 99 100 /** Reset the iterator, so that calling next() will return the first 101 data element. This is done implicitly in the constructor. 102 */ 103 void reset(const SkMetaData&); 104 105 /** Each time next is called, it returns the name of the next data element, 106 or null when there are no more elements. If non-null is returned, then the 107 element's type is returned (if not null), and the number of data values 108 is returned in count (if not null). 109 */ 110 const char* next(Type*, int* count); 111 112 private: 113 Rec* fRec; 114 }; 115 116 public: 117 struct Rec { 118 Rec* fNext; 119 uint16_t fDataCount; // number of elements 120 uint8_t fDataLen; // sizeof a single element 121 #ifdef SK_DEBUG 122 Type fType; 123 #else 124 uint8_t fType; 125 #endif 126 127 #ifdef SK_DEBUG 128 const char* fName; 129 union { 130 int32_t fS32; 131 SkScalar fScalar; 132 const char* fString; 133 void* fPtr; 134 bool fBool; 135 } fData; 136 #endif 137 dataRec138 const void* data() const { return (this + 1); } dataRec139 void* data() { return (this + 1); } nameRec140 const char* name() const { return (const char*)this->data() + fDataLen * fDataCount; } nameRec141 char* name() { return (char*)this->data() + fDataLen * fDataCount; } 142 143 static Rec* Alloc(size_t); 144 static void Free(Rec*); 145 }; 146 Rec* fRec; 147 148 const Rec* find(const char name[], Type) const; 149 void* set(const char name[], const void* data, size_t len, Type, int count); 150 bool remove(const char name[], Type); 151 }; 152 153 #endif 154 155