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/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SkMetaData_DEFINED
#define SkMetaData_DEFINED
#include "SkScalar.h"
class SkMetaData {
public:
SkMetaData();
SkMetaData(const SkMetaData& src);
~SkMetaData();
SkMetaData& operator=(const SkMetaData& src);
void reset();
bool findS32(const char name[], int32_t* value = NULL) const;
bool findScalar(const char name[], SkScalar* value = NULL) const;
const SkScalar* findScalars(const char name[], int* count, SkScalar values[] = NULL) const;
const char* findString(const char name[]) const;
bool findPtr(const char name[], void** value = NULL) const;
bool findBool(const char name[], bool* value = NULL) const;
const void* findData(const char name[], size_t* byteCount = NULL) 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 == NULL && value == NULL ||
v != NULL && value != NULL && !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 NULL != 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[] = NULL);
void setString(const char name[], const char value[]);
void setPtr(const char name[], void* value);
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[]);
SkDEBUGCODE(static void UnitTest();)
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(NULL) {}
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
#ifdef SK_DEBUG
Type fType;
#else
uint8_t fType;
#endif
#ifdef SK_DEBUG
const char* fName;
union {
int32_t fS32;
SkScalar fScalar;
const char* fString;
void* fPtr;
bool fBool;
} fData;
#endif
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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