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- /*
- * Copyright 2006 The Android Open Source Project
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #ifndef SkMetaData_DEFINED
- #define SkMetaData_DEFINED
- #include "include/core/SkScalar.h"
- class SkRefCnt;
- class SK_API SkMetaData {
- public:
- /**
- * Used to manage the life-cycle of a ptr in the metadata. This is option
- * in setPtr, and is only invoked when either copying one metadata to
- * another, or when the metadata is destroyed.
- *
- * setPtr(name, ptr, proc) {
- * fPtr = proc(ptr, true);
- * }
- *
- * copy: A = B {
- * A.fPtr = B.fProc(B.fPtr, true);
- * }
- *
- * ~SkMetaData {
- * fProc(fPtr, false);
- * }
- */
- typedef void* (*PtrProc)(void* ptr, bool doRef);
- /**
- * Implements PtrProc for SkRefCnt pointers
- */
- static void* RefCntProc(void* ptr, bool doRef);
- SkMetaData();
- SkMetaData(const SkMetaData& src);
- ~SkMetaData();
- SkMetaData& operator=(const SkMetaData& src);
- void reset();
- bool findS32(const char name[], int32_t* value = nullptr) const;
- bool findScalar(const char name[], SkScalar* value = nullptr) const;
- const SkScalar* findScalars(const char name[], int* count,
- SkScalar values[] = nullptr) const;
- const char* findString(const char name[]) const;
- bool findPtr(const char name[], void** value = nullptr, PtrProc* = nullptr) const;
- bool findBool(const char name[], bool* value = nullptr) const;
- const void* findData(const char name[], size_t* byteCount = nullptr) const;
- bool hasS32(const char name[], int32_t value) const {
- int32_t v;
- return this->findS32(name, &v) && v == value;
- }
- bool hasScalar(const char name[], SkScalar value) const {
- SkScalar v;
- return this->findScalar(name, &v) && v == value;
- }
- bool hasString(const char name[], const char value[]) const {
- const char* v = this->findString(name);
- return (v == nullptr && value == nullptr) ||
- (v != nullptr && value != nullptr && !strcmp(v, value));
- }
- bool hasPtr(const char name[], void* value) const {
- void* v;
- return this->findPtr(name, &v) && v == value;
- }
- bool hasBool(const char name[], bool value) const {
- bool v;
- return this->findBool(name, &v) && v == value;
- }
- bool hasData(const char name[], const void* data, size_t byteCount) const {
- size_t len;
- const void* ptr = this->findData(name, &len);
- return ptr && len == byteCount && !memcmp(ptr, data, len);
- }
- void setS32(const char name[], int32_t value);
- void setScalar(const char name[], SkScalar value);
- SkScalar* setScalars(const char name[], int count, const SkScalar values[] = nullptr);
- void setString(const char name[], const char value[]);
- void setPtr(const char name[], void* value, PtrProc proc = nullptr);
- void setBool(const char name[], bool value);
- // the data is copied from the input pointer.
- void setData(const char name[], const void* data, size_t byteCount);
- bool removeS32(const char name[]);
- bool removeScalar(const char name[]);
- bool removeString(const char name[]);
- bool removePtr(const char name[]);
- bool removeBool(const char name[]);
- bool removeData(const char name[]);
- // helpers for SkRefCnt
- bool findRefCnt(const char name[], SkRefCnt** ptr = nullptr) {
- return this->findPtr(name, reinterpret_cast<void**>(ptr));
- }
- bool hasRefCnt(const char name[], SkRefCnt* ptr) {
- return this->hasPtr(name, ptr);
- }
- void setRefCnt(const char name[], SkRefCnt* ptr) {
- this->setPtr(name, ptr, RefCntProc);
- }
- bool removeRefCnt(const char name[]) {
- return this->removePtr(name);
- }
- enum Type {
- kS32_Type,
- kScalar_Type,
- kString_Type,
- kPtr_Type,
- kBool_Type,
- kData_Type,
- kTypeCount
- };
- struct Rec;
- class Iter;
- friend class Iter;
- class Iter {
- public:
- Iter() : fRec(nullptr) {}
- Iter(const SkMetaData&);
- /** Reset the iterator, so that calling next() will return the first
- data element. This is done implicitly in the constructor.
- */
- void reset(const SkMetaData&);
- /** Each time next is called, it returns the name of the next data element,
- or null when there are no more elements. If non-null is returned, then the
- element's type is returned (if not null), and the number of data values
- is returned in count (if not null).
- */
- const char* next(Type*, int* count);
- private:
- Rec* fRec;
- };
- public:
- struct Rec {
- Rec* fNext;
- uint16_t fDataCount; // number of elements
- uint8_t fDataLen; // sizeof a single element
- uint8_t fType;
- const void* data() const { return (this + 1); }
- void* data() { return (this + 1); }
- const char* name() const { return (const char*)this->data() + fDataLen * fDataCount; }
- char* name() { return (char*)this->data() + fDataLen * fDataCount; }
- static Rec* Alloc(size_t);
- static void Free(Rec*);
- };
- Rec* fRec;
- const Rec* find(const char name[], Type) const;
- void* set(const char name[], const void* data, size_t len, Type, int count);
- bool remove(const char name[], Type);
- };
- #endif
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