1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/include/core/SkMetaData.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,175 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2006 The Android Open Source Project
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +#ifndef SkMetaData_DEFINED
1.14 +#define SkMetaData_DEFINED
1.15 +
1.16 +#include "SkScalar.h"
1.17 +
1.18 +class SkRefCnt;
1.19 +
1.20 +class SK_API SkMetaData {
1.21 +public:
1.22 + /**
1.23 + * Used to manage the life-cycle of a ptr in the metadata. This is option
1.24 + * in setPtr, and is only invoked when either copying one metadata to
1.25 + * another, or when the metadata is destroyed.
1.26 + *
1.27 + * setPtr(name, ptr, proc) {
1.28 + * fPtr = proc(ptr, true);
1.29 + * }
1.30 + *
1.31 + * copy: A = B {
1.32 + * A.fPtr = B.fProc(B.fPtr, true);
1.33 + * }
1.34 + *
1.35 + * ~SkMetaData {
1.36 + * fProc(fPtr, false);
1.37 + * }
1.38 + */
1.39 + typedef void* (*PtrProc)(void* ptr, bool doRef);
1.40 +
1.41 + /**
1.42 + * Implements PtrProc for SkRefCnt pointers
1.43 + */
1.44 + static void* RefCntProc(void* ptr, bool doRef);
1.45 +
1.46 + SkMetaData();
1.47 + SkMetaData(const SkMetaData& src);
1.48 + ~SkMetaData();
1.49 +
1.50 + SkMetaData& operator=(const SkMetaData& src);
1.51 +
1.52 + void reset();
1.53 +
1.54 + bool findS32(const char name[], int32_t* value = NULL) const;
1.55 + bool findScalar(const char name[], SkScalar* value = NULL) const;
1.56 + const SkScalar* findScalars(const char name[], int* count,
1.57 + SkScalar values[] = NULL) const;
1.58 + const char* findString(const char name[]) const;
1.59 + bool findPtr(const char name[], void** value = NULL, PtrProc* = NULL) const;
1.60 + bool findBool(const char name[], bool* value = NULL) const;
1.61 + const void* findData(const char name[], size_t* byteCount = NULL) const;
1.62 +
1.63 + bool hasS32(const char name[], int32_t value) const {
1.64 + int32_t v;
1.65 + return this->findS32(name, &v) && v == value;
1.66 + }
1.67 + bool hasScalar(const char name[], SkScalar value) const {
1.68 + SkScalar v;
1.69 + return this->findScalar(name, &v) && v == value;
1.70 + }
1.71 + bool hasString(const char name[], const char value[]) const {
1.72 + const char* v = this->findString(name);
1.73 + return (v == NULL && value == NULL) ||
1.74 + (v != NULL && value != NULL && !strcmp(v, value));
1.75 + }
1.76 + bool hasPtr(const char name[], void* value) const {
1.77 + void* v;
1.78 + return this->findPtr(name, &v) && v == value;
1.79 + }
1.80 + bool hasBool(const char name[], bool value) const {
1.81 + bool v;
1.82 + return this->findBool(name, &v) && v == value;
1.83 + }
1.84 + bool hasData(const char name[], const void* data, size_t byteCount) const {
1.85 + size_t len;
1.86 + const void* ptr = this->findData(name, &len);
1.87 + return NULL != ptr && len == byteCount && !memcmp(ptr, data, len);
1.88 + }
1.89 +
1.90 + void setS32(const char name[], int32_t value);
1.91 + void setScalar(const char name[], SkScalar value);
1.92 + SkScalar* setScalars(const char name[], int count, const SkScalar values[] = NULL);
1.93 + void setString(const char name[], const char value[]);
1.94 + void setPtr(const char name[], void* value, PtrProc proc = NULL);
1.95 + void setBool(const char name[], bool value);
1.96 + // the data is copied from the input pointer.
1.97 + void setData(const char name[], const void* data, size_t byteCount);
1.98 +
1.99 + bool removeS32(const char name[]);
1.100 + bool removeScalar(const char name[]);
1.101 + bool removeString(const char name[]);
1.102 + bool removePtr(const char name[]);
1.103 + bool removeBool(const char name[]);
1.104 + bool removeData(const char name[]);
1.105 +
1.106 + // helpers for SkRefCnt
1.107 + bool findRefCnt(const char name[], SkRefCnt** ptr = NULL) {
1.108 + return this->findPtr(name, reinterpret_cast<void**>(ptr));
1.109 + }
1.110 + bool hasRefCnt(const char name[], SkRefCnt* ptr) {
1.111 + return this->hasPtr(name, ptr);
1.112 + }
1.113 + void setRefCnt(const char name[], SkRefCnt* ptr) {
1.114 + this->setPtr(name, ptr, RefCntProc);
1.115 + }
1.116 + bool removeRefCnt(const char name[]) {
1.117 + return this->removePtr(name);
1.118 + }
1.119 +
1.120 + enum Type {
1.121 + kS32_Type,
1.122 + kScalar_Type,
1.123 + kString_Type,
1.124 + kPtr_Type,
1.125 + kBool_Type,
1.126 + kData_Type,
1.127 +
1.128 + kTypeCount
1.129 + };
1.130 +
1.131 + struct Rec;
1.132 + class Iter;
1.133 + friend class Iter;
1.134 +
1.135 + class Iter {
1.136 + public:
1.137 + Iter() : fRec(NULL) {}
1.138 + Iter(const SkMetaData&);
1.139 +
1.140 + /** Reset the iterator, so that calling next() will return the first
1.141 + data element. This is done implicitly in the constructor.
1.142 + */
1.143 + void reset(const SkMetaData&);
1.144 +
1.145 + /** Each time next is called, it returns the name of the next data element,
1.146 + or null when there are no more elements. If non-null is returned, then the
1.147 + element's type is returned (if not null), and the number of data values
1.148 + is returned in count (if not null).
1.149 + */
1.150 + const char* next(Type*, int* count);
1.151 +
1.152 + private:
1.153 + Rec* fRec;
1.154 + };
1.155 +
1.156 +public:
1.157 + struct Rec {
1.158 + Rec* fNext;
1.159 + uint16_t fDataCount; // number of elements
1.160 + uint8_t fDataLen; // sizeof a single element
1.161 + uint8_t fType;
1.162 +
1.163 + const void* data() const { return (this + 1); }
1.164 + void* data() { return (this + 1); }
1.165 + const char* name() const { return (const char*)this->data() + fDataLen * fDataCount; }
1.166 + char* name() { return (char*)this->data() + fDataLen * fDataCount; }
1.167 +
1.168 + static Rec* Alloc(size_t);
1.169 + static void Free(Rec*);
1.170 + };
1.171 + Rec* fRec;
1.172 +
1.173 + const Rec* find(const char name[], Type) const;
1.174 + void* set(const char name[], const void* data, size_t len, Type, int count);
1.175 + bool remove(const char name[], Type);
1.176 +};
1.177 +
1.178 +#endif
