1 2 /* 3 * Copyright 2010 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 10 #ifndef SkPDFStream_DEFINED 11 #define SkPDFStream_DEFINED 12 13 #include "SkPDFTypes.h" 14 #include "SkRefCnt.h" 15 #include "SkStream.h" 16 #include "SkTemplates.h" 17 18 class SkPDFCatalog; 19 20 /** \class SkPDFStream 21 22 A stream object in a PDF. Note, all streams must be indirect objects (via 23 SkObjRef). 24 TODO(vandebo): SkStream should be replaced by SkStreamRewindable when that 25 is feasible. 26 */ 27 class SkPDFStream : public SkPDFDict { 28 SK_DECLARE_INST_COUNT(SkPDFStream) 29 public: 30 /** Create a PDF stream. A Length entry is automatically added to the 31 * stream dictionary. The stream may be retained (stream->ref() may be 32 * called) so its contents must not be changed after calling this. 33 * @param data The data part of the stream. 34 */ 35 explicit SkPDFStream(SkData* data); 36 /** Deprecated constructor. */ 37 explicit SkPDFStream(SkStream* stream); 38 /** Create a PDF stream with the same content and dictionary entries 39 * as the passed one. 40 */ 41 explicit SkPDFStream(const SkPDFStream& pdfStream); 42 virtual ~SkPDFStream(); 43 44 // The SkPDFObject interface. 45 virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog, 46 bool indirect); 47 virtual size_t getOutputSize(SkPDFCatalog* catalog, bool indirect); 48 49 protected: 50 enum State { 51 kUnused_State, //!< The stream hasn't been requested yet. 52 kNoCompression_State, //!< The stream's been requested in an 53 // uncompressed form. 54 kCompressed_State, //!< The stream's already been compressed. 55 }; 56 57 /* Create a PDF stream with no data. The setData method must be called to 58 * set the data. 59 */ 60 SkPDFStream(); 61 62 // Populate the stream dictionary. This method returns false if 63 // fSubstitute should be used. 64 virtual bool populate(SkPDFCatalog* catalog); 65 setSubstitute(SkPDFStream * stream)66 void setSubstitute(SkPDFStream* stream) { 67 fSubstitute.reset(stream); 68 } 69 getSubstitute()70 SkPDFStream* getSubstitute() { 71 return fSubstitute.get(); 72 } 73 74 void setData(SkData* data); 75 void setData(SkStream* stream); 76 getData()77 SkStream* getData() { 78 return fData.get(); 79 } 80 setState(State state)81 void setState(State state) { 82 fState = state; 83 } 84 getState()85 State getState() { 86 return fState; 87 } 88 89 private: 90 // Indicates what form (or if) the stream has been requested. 91 State fState; 92 93 // TODO(vandebo): Use SkData (after removing deprecated constructor). 94 SkAutoTUnref<SkStream> fData; 95 SkAutoTUnref<SkPDFStream> fSubstitute; 96 97 typedef SkPDFDict INHERITED; 98 }; 99 100 #endif 101