SkDocument::setDCTEncoder() for old versions of webkit

include/core/SkDocument.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDocument_DEFINED
 #define SkDocument_DEFINED
 
 #include "SkBitmap.h"
 #include "SkPicture.h"
 #include "SkRect.h"
 #include "SkRefCnt.h"
 #include "SkString.h"
 #include "SkTime.h"
 
 class SkCanvas;
+class SkData;
+class SkPixmap;
 class SkWStream;
 
 /** SK_ScalarDefaultDPI is 72 DPI.
 */
 #define SK_ScalarDefaultRasterDPI           72.0f
 
 /**
  *  High-level API for creating a document-based canvas. To use..
  *
  *  1. Create a document, specifying a stream to store the output.
@@ skipping 97 matching lines @@
      *  }
      */
     struct Attribute {
         SkString fKey, fValue;
         Attribute(const SkString& k, const SkString& v) : fKey(k), fValue(v) {}
     };
     virtual void setMetadata(const SkTArray<SkDocument::Attribute>&,
                              const SkTime::DateTime* /* creationDate */,
                              const SkTime::DateTime* /* modifiedDate */) {}
 
+    /**
+     *  For PDF documents, if a DCTEncoder (discrete cosine transform)
+     *  is set, use it to encode SkImages and SkBitmaps as [JFIF]JPEGs.
+     *  This feature is deprecated and is only supplied for backwards
+     *  compatability.
+     *
+     *  The prefered method to create PDFs with JPEG images is to use
+     *  SkImage::NewFromEncoded() and not setDCTEncoder().  Chromium
+     *  uses NewFromEncoded.
+     *
+     *  If the encoder is unset, or if it returns NULL, fall back on
+     *  encoding images with Deflate.
+     */
+    virtual void setDCTEncoder(SkData* (*)(const SkPixmap&)) {}
+
 protected:
     SkDocument(SkWStream*, void (*)(SkWStream*, bool aborted));
 
     // note: subclasses must call close() in their destructor, as the base class
     // cannot do this for them.
     virtual ~SkDocument();
 
     virtual SkCanvas* onBeginPage(SkScalar width, SkScalar height,
                                   const SkRect& content) = 0;
     virtual void onEndPage() = 0;
@@ skipping 12 matching lines @@
 
 private:
     SkWStream* fStream;
     void       (*fDoneProc)(SkWStream*, bool aborted);
     State      fState;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif