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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 SkFlattenable_DEFINED
#define SkFlattenable_DEFINED
#include "SkRefCnt.h"
#include "SkBitmap.h"
#include "SkReader32.h"
#include "SkTDArray.h"
#include "SkWriter32.h"
class SkFlattenableReadBuffer;
class SkFlattenableWriteBuffer;
class SkString;
/** \class SkFlattenable
SkFlattenable is the base class for objects that need to be flattened
into a data stream for either transport or as part of the key to the
font cache.
*/
class SK_API SkFlattenable : public SkRefCnt {
public:
typedef SkFlattenable* (*Factory)(SkFlattenableReadBuffer&);
SkFlattenable() {}
/** Implement this to return a factory function pointer that can be called
to recreate your class given a buffer (previously written to by your
override of flatten().
*/
virtual Factory getFactory() = 0;
/** Override this to write data specific to your subclass into the buffer,
being sure to call your super-class' version first. This data will later
be passed to your Factory function, returned by getFactory().
*/
virtual void flatten(SkFlattenableWriteBuffer&);
/** Set the string to describe the sublass and return true. If this is not
overridden, ignore the string param and return false.
*/
virtual bool toDumpString(SkString*) const;
static Factory NameToFactory(const char name[]);
static const char* FactoryToName(Factory);
static void Register(const char name[], Factory);
class Registrar {
public:
Registrar(const char name[], Factory factory) {
SkFlattenable::Register(name, factory);
}
};
protected:
SkFlattenable(SkFlattenableReadBuffer&) {}
};
// helpers for matrix and region
class SkMatrix;
extern void SkReadMatrix(SkReader32*, SkMatrix*);
extern void SkWriteMatrix(SkWriter32*, const SkMatrix&);
class SkRegion;
extern void SkReadRegion(SkReader32*, SkRegion*);
extern void SkWriteRegion(SkWriter32*, const SkRegion&);
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
class SkTypeface;
class SkFlattenableReadBuffer : public SkReader32 {
public:
SkFlattenableReadBuffer();
explicit SkFlattenableReadBuffer(const void* data);
SkFlattenableReadBuffer(const void* data, size_t size);
void setRefCntArray(SkRefCnt* array[], int count) {
fRCArray = array;
fRCCount = count;
}
void setTypefaceArray(SkTypeface* array[], int count) {
fTFArray = array;
fTFCount = count;
}
/**
* Call this with a pre-loaded array of Factories, in the same order as
* were created/written by the writer. SkPicture uses this.
*/
void setFactoryPlayback(SkFlattenable::Factory array[], int count) {
fFactoryTDArray = NULL;
fFactoryArray = array;
fFactoryCount = count;
}
/**
* Call this with an initially empty array, so the reader can cache each
* factory it sees by name. Used by the pipe code in conjunction with
* the writer's kInlineFactoryNames_Flag.
*/
void setFactoryArray(SkTDArray<SkFlattenable::Factory>* array) {
fFactoryTDArray = array;
fFactoryArray = NULL;
fFactoryCount = 0;
}
SkTypeface* readTypeface();
SkRefCnt* readRefCnt();
void* readFunctionPtr();
SkFlattenable* readFlattenable();
private:
SkRefCnt** fRCArray;
int fRCCount;
SkTypeface** fTFArray;
int fTFCount;
SkTDArray<SkFlattenable::Factory>* fFactoryTDArray;
SkFlattenable::Factory* fFactoryArray;
int fFactoryCount;
typedef SkReader32 INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
#include "SkPtrRecorder.h"
/**
* Subclass of SkTPtrSet specialed to call ref() and unref() when the
* base class's incPtr() and decPtr() are called. This makes it a valid owner
* of each ptr, which is released when the set is reset or destroyed.
*/
class SkRefCntSet : public SkTPtrSet<SkRefCnt*> {
public:
virtual ~SkRefCntSet();
protected:
// overrides
virtual void incPtr(void*);
virtual void decPtr(void*);
};
class SkFactorySet : public SkTPtrSet<SkFlattenable::Factory> {};
class SkFlattenableWriteBuffer : public SkWriter32 {
public:
SkFlattenableWriteBuffer(size_t minSize);
virtual ~SkFlattenableWriteBuffer();
void writeTypeface(SkTypeface*);
void writeRefCnt(SkRefCnt*);
void writeFunctionPtr(void*);
void writeFlattenable(SkFlattenable* flattenable);
SkRefCntSet* getTypefaceRecorder() const { return fTFSet; }
SkRefCntSet* setTypefaceRecorder(SkRefCntSet*);
SkRefCntSet* getRefCntRecorder() const { return fRCSet; }
SkRefCntSet* setRefCntRecorder(SkRefCntSet*);
SkFactorySet* getFactoryRecorder() const { return fFactorySet; }
SkFactorySet* setFactoryRecorder(SkFactorySet*);
enum Flags {
kCrossProcess_Flag = 0x01,
/**
* Instructs the writer to inline Factory names as there are seen the
* first time (after that we store an index). The pipe code uses this.
*/
kInlineFactoryNames_Flag = 0x02,
};
Flags getFlags() const { return (Flags)fFlags; }
void setFlags(Flags flags) { fFlags = flags; }
bool isCrossProcess() const {
return SkToBool(fFlags & kCrossProcess_Flag);
}
bool inlineFactoryNames() const {
return SkToBool(fFlags & kInlineFactoryNames_Flag);
}
bool persistBitmapPixels() const {
return (fFlags & kCrossProcess_Flag) != 0;
}
bool persistTypeface() const { return (fFlags & kCrossProcess_Flag) != 0; }
private:
uint32_t fFlags;
SkRefCntSet* fTFSet;
SkRefCntSet* fRCSet;
SkFactorySet* fFactorySet;
typedef SkWriter32 INHERITED;
};
#endif
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