[PDF] Fix image references.

src/pdf/SkPDFImage.cpp

 /*
  * 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.
  */
 
 #include "SkPDFImage.h"
 
 #include "SkBitmap.h"
@@ skipping 373 matching lines @@
 void SkPDFImage::getResources(const SkTSet<SkPDFObject*>& knownResourceObjects,
                               SkTSet<SkPDFObject*>* newResourceObjects) {
     GetResourcesHelper(&fResources, knownResourceObjects, newResourceObjects);
 }
 
 SkPDFImage::SkPDFImage(SkStream* stream,
                        const SkBitmap& bitmap,
                        bool isAlpha,
                        const SkIRect& srcRect,
                        EncodeToDCTStream encoder)
-    : fBitmap(bitmap),
-      fIsAlpha(isAlpha),
+    : fIsAlpha(isAlpha),
       fSrcRect(srcRect),
       fEncoder(encoder) {
 
+    if (bitmap.isImmutable()) {
+        fBitmap = bitmap;
+    } else {
+        bitmap.deepCopyTo(&fBitmap, bitmap.config());
+        fBitmap.setImmutable();
+    }
+
     if (stream != NULL) {
         setData(stream);
         fStreamValid = true;
     } else {
         fStreamValid = false;
     }
 
     SkBitmap::Config config = fBitmap.getConfig();
 
     insertName("Type", "XObject");
@@ skipping 96 matching lines @@
         // but the new catalog wants it compressed.
         if (!getSubstitute()) {
             SkPDFStream* substitute = SkNEW_ARGS(SkPDFImage, (*this));
             setSubstitute(substitute);
             catalog->setSubstitute(this, substitute);
         }
         return false;
     }
     return true;
 }