SkDocument::setDCTEncoder() for old versions of webkit

src/pdf/SkPDFBitmap.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkColorPriv.h"
 #include "SkData.h"
 #include "SkDeflate.h"
@@ skipping 450 matching lines @@
     pdfDict.insertInt("Length", SkToInt(fData->size()));
     pdfDict.emitObject(stream, objNumMap, substituteMap);
     pdf_stream_begin(stream);
     stream->write(fData->data(), fData->size());
     pdf_stream_end(stream);
 }
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
 
-SkPDFObject* SkPDFCreateBitmapObject(const SkImage* image) {
+SkPDFObject* SkPDFCreateBitmapObject(const SkImage* image,
+                                     SkPixelSerializer* pixelSerializer) {
     SkAutoTUnref<SkData> data(image->refEncoded());
     SkJFIFInfo info;
     if (data && SkIsJFIF(data, &info)) {
         bool yuv = info.fType == SkJFIFInfo::kYCbCr;
         if (info.fSize == image->dimensions()) {  // Sanity check.
             // hold on to data, not image.
             #ifdef SK_PDF_IMAGE_STATS
             gJpegImageObjects.fetch_add(1);
             #endif
             return new PDFJpegBitmap(info.fSize, data, yuv);
         }
     }
+
+    if (pixelSerializer) {
+        SkBitmap bm;
+        SkAutoPixmapUnlock apu;
+        if (as_IB(image)->getROPixels(&bm) && bm.requestLock(&apu)) {
+            data.reset(pixelSerializer->encode(apu.pixmap()));
+            if (data && SkIsJFIF(data, &info)) {
+                bool yuv = info.fType == SkJFIFInfo::kYCbCr;
+                if (info.fSize == image->dimensions()) {  // Sanity check.
+                    return new PDFJpegBitmap(info.fSize, data, yuv);
+                }
+            }
+        }
+    }
+
     SkPDFObject* smask =
             image_compute_is_opaque(image) ? nullptr : new PDFAlphaBitmap(image);
     #ifdef SK_PDF_IMAGE_STATS
     gRegularImageObjects.fetch_add(1);
     #endif
     return new PDFDefaultBitmap(image, smask);
 }