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      1 /*
      2  * Copyright 2013 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef SkPDFImageStream_DEFINED
      9 #define SkPDFImageStream_DEFINED
     10 
     11 #include "SkBitmap.h"
     12 #include "SkPDFDevice.h"
     13 #include "SkPDFStream.h"
     14 #include "SkPDFTypes.h"
     15 #include "SkRect.h"
     16 #include "SkRefCnt.h"
     17 #include "SkStream.h"
     18 #include "SkTemplates.h"
     19 
     20 class SkPDFCatalog;
     21 
     22 /** \class SkPDFImageStream
     23 
     24     An image stream object in a PDF.  Note, all streams must be indirect objects
     25     (via SkObjRef).
     26     This class is similar to SkPDFStream, but it is also able to use image
     27     specific compression. Currently we support DCT(jpeg) and flate(zip).
     28 */
     29 class SkPDFImageStream : public SkPDFStream {
     30 public:
     31     /** Create a PDF stream with the same content and dictionary entries
     32      *  as the passed one.
     33      */
     34     explicit SkPDFImageStream(const SkPDFImageStream& pdfStream);
     35     virtual ~SkPDFImageStream();
     36 
     37 protected:
     38     SkPDFImageStream(SkStream* stream, const SkBitmap& bitmap,
     39                      const SkIRect& srcRect, EncodeToDCTStream encoder);
     40 
     41     // Populate the stream dictionary.  This method returns false if
     42     // fSubstitute should be used.
     43     virtual bool populate(SkPDFCatalog* catalog);
     44 
     45 private:
     46     const SkBitmap fBitmap;
     47     const SkIRect fSrcRect;
     48     EncodeToDCTStream fEncoder;
     49 
     50     typedef SkPDFStream INHERITED;
     51 };
     52 
     53 #endif
     54