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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 SkGPipe_DEFINED
#define SkGPipe_DEFINED
#include "SkWriter32.h"
#include "SkFlattenable.h"
class SkCanvas;
// XLib.h might have defined Status already (ugh)
#ifdef Status
#undef Status
#endif
class SkGPipeReader {
public:
SkGPipeReader();
SkGPipeReader(SkCanvas* target);
~SkGPipeReader();
enum Status {
kDone_Status, //!< no more data expected from reader
kEOF_Status, //!< need more data from reader
kError_Status, //!< encountered error
kReadAtom_Status//!< finished reading an atom
};
enum PlaybackFlags {
kReadAtom_PlaybackFlag = 0x1, //!< playback a single command from the stream
kSilent_PlaybackFlag = 0x2, //!< playback without drawing
};
void setCanvas(SkCanvas*);
// data must be 4-byte aligned
// length must be a multiple of 4
Status playback(const void* data, size_t length, uint32_t playbackFlags = 0,
size_t* bytesRead = NULL);
private:
SkCanvas* fCanvas;
class SkGPipeState* fState;
};
///////////////////////////////////////////////////////////////////////////////
class SkGPipeCanvas;
class SkGPipeController {
public:
SkGPipeController() : fCanvas(NULL) {}
virtual ~SkGPipeController();
/**
* Called periodically by the writer, to get a working buffer of RAM to
* write into. The actual size of the block is also returned, and must be
* actual >= minRequest. If NULL is returned, then actual is ignored and
* writing will stop.
*
* The returned block must be 4-byte aligned, and actual must be a
* multiple of 4.
* minRequest will always be a multiple of 4.
*/
virtual void* requestBlock(size_t minRequest, size_t* actual) = 0;
/**
* This is called each time some atomic portion of the data has been
* written to the block (most recently returned by requestBlock()).
* If bytes == 0, then the writer has finished.
*
* bytes will always be a multiple of 4.
*/
virtual void notifyWritten(size_t bytes) = 0;
virtual int numberOfReaders() const { return 1; }
private:
friend class SkGPipeWriter;
void setCanvas(SkGPipeCanvas*);
SkGPipeCanvas* fCanvas;
};
class SkGPipeWriter {
public:
SkGPipeWriter();
~SkGPipeWriter();
bool isRecording() const { return NULL != fCanvas; }
enum Flags {
/**
* Tells the writer that the reader will be in a different process, so
* (for example) we cannot put function pointers in the stream.
*/
kCrossProcess_Flag = 1 << 0,
/**
* Only meaningful if kCrossProcess_Flag is set. Tells the writer that
* in spite of being cross process, it will have shared address space
* with the reader, so the two can share large objects (like SkBitmaps).
*/
kSharedAddressSpace_Flag = 1 << 1,
/**
* Tells the writer that there will be multiple threads reading the stream
* simultaneously.
*/
kSimultaneousReaders_Flag = 1 << 2,
};
SkCanvas* startRecording(SkGPipeController*, uint32_t flags = 0,
uint32_t width = kDefaultRecordingCanvasSize,
uint32_t height = kDefaultRecordingCanvasSize);
// called in destructor, but can be called sooner once you know there
// should be no more drawing calls made into the recording canvas.
void endRecording();
/**
* Tells the writer to commit all recorded draw commands to the
* controller immediately.
* @param detachCurrentBlock Set to true to request that the next draw
* command be recorded in a new block.
*/
void flushRecording(bool detachCurrentBlock);
/**
* Return the amount of bytes being used for recording. Note that this
* does not include the amount of storage written to the stream, which is
* controlled by the SkGPipeController.
* Currently only returns the amount used for SkBitmaps, since they are
* potentially unbounded (if the client is not calling playback).
*/
size_t storageAllocatedForRecording() const;
/**
* Attempt to reduce the storage allocated for recording by evicting
* cache resources.
* @param bytesToFree minimum number of bytes that should be attempted to
* be freed.
* @return number of bytes actually freed.
*/
size_t freeMemoryIfPossible(size_t bytesToFree);
private:
enum {
kDefaultRecordingCanvasSize = 32767,
};
SkGPipeCanvas* fCanvas;
SkWriter32 fWriter;
};
#endif
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