SkDocument::setDCTEncoder() for old versions of webkit

src/pdf/SkPDFCanon.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkPDFCanon_DEFINED
 #define SkPDFCanon_DEFINED
 
 #include "SkBitmap.h"
@@ skipping 31 matching lines @@
  *  SkPDFCanon.
  *
  *  The addFoo() methods will ref the Foo; the canon's destructor will
  *  call foo->unref() on all of these objects.
  *
  *  The findFoo() methods do not change the ref count of the Foo
  *  objects.
  */
 class SkPDFCanon : SkNoncopyable {
 public:
+    SkPDFCanon() : fEncoder(nullptr) {}
     ~SkPDFCanon() { this->reset(); }
 
     // reset to original setting, unrefs all objects.
     void reset();
 
     // Returns exact match if there is one.  If not, it returns nullptr.
     // If there is no exact match, but there is a related font, we
     // still return nullptr, but also set *relatedFont.
     SkPDFFont* findFont(uint32_t fontID,
                         uint16_t glyphID,
@@ skipping 11 matching lines @@
 
     const SkPDFGraphicState* findGraphicState(const SkPDFGraphicState&) const;
     void addGraphicState(const SkPDFGraphicState*);
 
     SkPDFObject* findPDFBitmap(const SkImage* image) const;
     void addPDFBitmap(uint32_t imageUniqueID, SkPDFObject*);
     const SkImage* bitmapToImage(const SkBitmap&);
 
     SkTHashMap<uint32_t, bool> fCanEmbedTypeface;
 
+    SkData* (*fEncoder)(const SkPixmap&);
+
 private:
     struct FontRec {
         SkPDFFont* fFont;
         uint32_t fFontID;
         uint16_t fGlyphID;
     };
     SkTDArray<FontRec> fFontRecords;
 
     SkTDArray<SkPDFFunctionShader*> fFunctionShaderRecords;
 
@@ skipping 15 matching lines @@
                 return w.fPtr->hash();
             }
         };
     };
     SkTHashSet<WrapGS, WrapGS::Hash> fGraphicStateRecords;
 
     SkTHashMap<SkBitmapKey, const SkImage*> fBitmapToImageMap;
     SkTHashMap<uint32_t /*ImageUniqueID*/, SkPDFObject*> fPDFBitmapMap;
 };
 #endif  // SkPDFCanon_DEFINED