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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkReadBuffer_DEFINED
#define SkReadBuffer_DEFINED
#include "SkBitmapHeap.h"
#include "SkColorFilter.h"
#include "SkData.h"
#include "SkDrawLooper.h"
#include "SkImageFilter.h"
#include "SkMaskFilter.h"
#include "SkPath.h"
#include "SkPathEffect.h"
#include "SkPicture.h"
#include "SkPixelRef.h"
#include "SkRasterizer.h"
#include "SkReadBuffer.h"
#include "SkReader32.h"
#include "SkRefCnt.h"
#include "SkShader.h"
#include "SkUnitMapper.h"
#include "SkWriteBuffer.h"
#include "SkXfermode.h"
class SkBitmap;
#if defined(SK_DEBUG) && defined(SK_BUILD_FOR_MAC)
#define DEBUG_NON_DETERMINISTIC_ASSERT
#endif
class SkReadBuffer {
public:
SkReadBuffer();
SkReadBuffer(const void* data, size_t size);
SkReadBuffer(SkStream* stream);
virtual ~SkReadBuffer();
enum Version {
kFilterLevelIsEnum_Version = 23,
kGradientFlippedFlag_Version = 24,
kDashWritesPhaseIntervals_Version = 25,
kColorShaderNoBool_Version = 26,
};
/**
* Returns true IFF the version is older than the specified version.
*/
bool isVersionLT(Version targetVersion) const {
SkASSERT(targetVersion > 0);
return fVersion > 0 && fVersion < targetVersion;
}
/** This may be called at most once; most clients of SkReadBuffer should not mess with it. */
void setVersion(int version) {
SkASSERT(0 == fVersion || version == fVersion);
fVersion = version;
}
enum Flags {
kCrossProcess_Flag = 1 << 0,
kScalarIsFloat_Flag = 1 << 1,
kPtrIs64Bit_Flag = 1 << 2,
kValidation_Flag = 1 << 3,
};
void setFlags(uint32_t flags) { fFlags = flags; }
uint32_t getFlags() const { return fFlags; }
bool isCrossProcess() const {
return this->isValidating() || SkToBool(fFlags & kCrossProcess_Flag);
}
bool isScalarFloat() const { return SkToBool(fFlags & kScalarIsFloat_Flag); }
bool isPtr64Bit() const { return SkToBool(fFlags & kPtrIs64Bit_Flag); }
bool isValidating() const { return SkToBool(fFlags & kValidation_Flag); }
SkReader32* getReader32() { return &fReader; }
size_t size() { return fReader.size(); }
size_t offset() { return fReader.offset(); }
bool eof() { return fReader.eof(); }
const void* skip(size_t size) { return fReader.skip(size); }
void* readFunctionPtr() { return fReader.readPtr(); }
// primitives
virtual bool readBool();
virtual SkColor readColor();
virtual SkFixed readFixed();
virtual int32_t readInt();
virtual SkScalar readScalar();
virtual uint32_t readUInt();
virtual int32_t read32();
// strings -- the caller is responsible for freeing the string contents
virtual void readString(SkString* string);
virtual void* readEncodedString(size_t* length, SkPaint::TextEncoding encoding);
// common data structures
virtual void readPoint(SkPoint* point);
SkPoint readPoint() { SkPoint p; this->readPoint(&p); return p; }
virtual void readMatrix(SkMatrix* matrix);
virtual void readIRect(SkIRect* rect);
virtual void readRect(SkRect* rect);
virtual void readRegion(SkRegion* region);
virtual void readPath(SkPath* path);
void readPaint(SkPaint* paint) { paint->unflatten(*this); }
virtual SkFlattenable* readFlattenable(SkFlattenable::Type);
template <typename T> T* readFlattenable() {
return (T*) this->readFlattenable(T::GetFlattenableType());
}
SkColorFilter* readColorFilter() { return this->readFlattenable<SkColorFilter>(); }
SkDrawLooper* readDrawLooper() { return this->readFlattenable<SkDrawLooper>(); }
SkImageFilter* readImageFilter() { return this->readFlattenable<SkImageFilter>(); }
SkMaskFilter* readMaskFilter() { return this->readFlattenable<SkMaskFilter>(); }
SkPathEffect* readPathEffect() { return this->readFlattenable<SkPathEffect>(); }
SkPixelRef* readPixelRef() { return this->readFlattenable<SkPixelRef>(); }
SkRasterizer* readRasterizer() { return this->readFlattenable<SkRasterizer>(); }
SkShader* readShader() { return this->readFlattenable<SkShader>(); }
SkUnitMapper* readUnitMapper() { return this->readFlattenable<SkUnitMapper>(); }
SkXfermode* readXfermode() { return this->readFlattenable<SkXfermode>(); }
// binary data and arrays
virtual bool readByteArray(void* value, size_t size);
virtual bool readColorArray(SkColor* colors, size_t size);
virtual bool readIntArray(int32_t* values, size_t size);
virtual bool readPointArray(SkPoint* points, size_t size);
virtual bool readScalarArray(SkScalar* values, size_t size);
SkData* readByteArrayAsData() {
size_t len = this->getArrayCount();
if (!this->validateAvailable(len)) {
return SkData::NewEmpty();
}
void* buffer = sk_malloc_throw(len);
this->readByteArray(buffer, len);
return SkData::NewFromMalloc(buffer, len);
}
// helpers to get info about arrays and binary data
virtual uint32_t getArrayCount();
virtual void readBitmap(SkBitmap* bitmap);
virtual SkTypeface* readTypeface();
void setBitmapStorage(SkBitmapHeapReader* bitmapStorage) {
SkRefCnt_SafeAssign(fBitmapStorage, bitmapStorage);
}
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
* SkWriteBuffer::setNamedFactoryRecorder.
*/
void setFactoryArray(SkTDArray<SkFlattenable::Factory>* array) {
fFactoryTDArray = array;
fFactoryArray = NULL;
fFactoryCount = 0;
}
/**
* Provide a function to decode an SkBitmap from encoded data. Only used if the writer
* encoded the SkBitmap. If the proper decoder cannot be used, a red bitmap with the
* appropriate size will be used.
*/
void setBitmapDecoder(SkPicture::InstallPixelRefProc bitmapDecoder) {
fBitmapDecoder = bitmapDecoder;
}
// Default impelementations don't check anything.
virtual bool validate(bool isValid) { return true; }
virtual bool isValid() const { return true; }
virtual bool validateAvailable(size_t size) { return true; }
protected:
SkReader32 fReader;
private:
bool readArray(void* value, size_t size, size_t elementSize);
uint32_t fFlags;
int fVersion;
void* fMemoryPtr;
SkBitmapHeapReader* fBitmapStorage;
SkTypeface** fTFArray;
int fTFCount;
SkTDArray<SkFlattenable::Factory>* fFactoryTDArray;
SkFlattenable::Factory* fFactoryArray;
int fFactoryCount;
SkPicture::InstallPixelRefProc fBitmapDecoder;
#ifdef DEBUG_NON_DETERMINISTIC_ASSERT
// Debugging counter to keep track of how many bitmaps we
// have decoded.
int fDecodedBitmapIndex;
#endif // DEBUG_NON_DETERMINISTIC_ASSERT
};
#endif // SkReadBuffer_DEFINED
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