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/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkPDFStream_DEFINED
#define SkPDFStream_DEFINED
#include "SkPDFTypes.h"
#include "SkRefCnt.h"
#include "SkStream.h"
#include "SkTemplates.h"
class SkPDFCatalog;
/** \class SkPDFStream
A stream object in a PDF. Note, all streams must be indirect objects (via
SkObjRef).
*/
class SkPDFStream : public SkPDFDict {
SK_DECLARE_INST_COUNT(SkPDFStream)
public:
/** Create a PDF stream. A Length entry is automatically added to the
* stream dictionary.
* @param data The data part of the stream. Will be ref()ed.
*/
explicit SkPDFStream(SkData* data);
/** Create a PDF stream. A Length entry is automatically added to the
* stream dictionary.
* @param stream The data part of the stream. Will be duplicate()d.
*/
explicit SkPDFStream(SkStream* stream);
virtual ~SkPDFStream();
// The SkPDFObject interface. These two methods use a mutex to
// allow multiple threads to call at the same time.
virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
bool indirect);
virtual size_t getOutputSize(SkPDFCatalog* catalog, bool indirect);
protected:
enum State {
kUnused_State, //!< The stream hasn't been requested yet.
kNoCompression_State, //!< The stream's been requested in an
// uncompressed form.
kCompressed_State, //!< The stream's already been compressed.
};
/** Create a PDF stream with the same content and dictionary entries
* as the passed one.
*/
explicit SkPDFStream(const SkPDFStream& pdfStream);
/* Create a PDF stream with no data. The setData method must be called to
* set the data.
*/
SkPDFStream();
// Populate the stream dictionary. This method returns false if
// fSubstitute should be used.
virtual bool populate(SkPDFCatalog* catalog);
void setSubstitute(SkPDFStream* stream) {
fSubstitute.reset(stream);
}
SkPDFStream* getSubstitute() const {
return fSubstitute.get();
}
void setData(SkData* data);
void setData(SkStream* stream);
size_t dataSize() const;
void setState(State state) {
fState = state;
}
State getState() const {
return fState;
}
private:
// Indicates what form (or if) the stream has been requested.
State fState;
// Mutex guards fState, fDataStream, and fSubstitute in public interface.
SkMutex fMutex;
SkMemoryStream fMemoryStream; // Used by fDataStream when
// fDataStream needs to be backed
// by SkData.
SkAutoTUnref<SkStreamRewindable> fDataStream;
SkAutoTUnref<SkPDFStream> fSubstitute;
typedef SkPDFDict INHERITED;
};
#endif
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