JPEG(JFIF only) directly embedded into PDF

src/pdf/SkPDFImage.h

 
 /*
  * Copyright 2010 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPDFImage_DEFINED
 #define SkPDFImage_DEFINED
 
 #include "SkPicture.h"
 #include "SkPDFDevice.h"
 #include "SkPDFStream.h"
 #include "SkPDFTypes.h"
 #include "SkRefCnt.h"
 
 class SkBitmap;
+class SkData;
 class SkPDFCatalog;
 struct SkIRect;
 
+/**
+ *  Return the mose efficient availible encoding of the given bitmap.
+ *
+ *  If the bitmap has encoded JPEG data and that data can be embedded
+ *  into the PDF output stream directly, use that.  Otherwise, fall
+ *  back on SkPDFImage::CreateImage.
+ */
+SkPDFObject* SkPDFCreateImageObject(
+        const SkBitmap&, const SkIRect& subset, SkPicture::EncodeBitmap);
+
 /** \class SkPDFImage
 
     An image XObject.
 */
 
 // We could play the same trick here as is done in SkPDFGraphicState, storing
 // a copy of the Bitmap object (not the pixels), the pixel generation number,
 // and settings used from the paint to canonicalize image objects.
 class SkPDFImage : public SkPDFStream {
 public:
@@ skipping 56 matching lines @@
     SkPDFImage(SkPDFImage& pdfImage);
 
     // Populate the stream dictionary.  This method returns false if
     // fSubstitute should be used.
     virtual bool populate(SkPDFCatalog* catalog);
 
     typedef SkPDFStream INHERITED;
 };
 
 #endif