pdfviewer: if the resources are missing, exit (right now inheritance is not implemented)

experimental/PdfViewer/SkPdfRenderer.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvas.h"
 #include "SkDevice.h"
 #include "SkForceLinking.h"
@@ skipping 1023 matching lines @@
     if (!skobj->isContentsAStream(pdfContext->fPdfDoc)) {
         return kNYI_SkPdfResult;
     }
 
     SkPdfStream* stream = skobj->getContentsAsStream(pdfContext->fPdfDoc);
 
     if (!stream) {
         return kIgnoreError_SkPdfResult;
     }
 
+    pdfContext->fGraphicsState.fResources = skobj->Resources(pdfContext->fPdfDoc);
+
+    if (!pdfContext->fGraphicsState.fResources) {
+        return kIgnoreError_SkPdfResult;  // probably it is null because we have not implemented yet inheritance
+    }
+
     if (CheckRecursiveRendering::IsInRendering(skobj)) {
         // Oops, corrupt PDF!
         return kIgnoreError_SkPdfResult;
     }
     CheckRecursiveRendering checkRecursion(skobj);
 
 
     PdfOp_q(pdfContext, canvas, NULL);
 
-
-    if (skobj->Resources(pdfContext->fPdfDoc)) {
-        pdfContext->fGraphicsState.fResources = skobj->Resources(pdfContext->fPdfDoc);
-    }
-
     // TODO(edisonn): MediaBox can be inherited!!!!
     SkRect bbox = skobj->MediaBox(pdfContext->fPdfDoc);
     if (skobj->has_Group()) {
         SkPdfTransparencyGroupDictionary* tgroup = skobj->Group(pdfContext->fPdfDoc);
         doGroup_before(pdfContext, canvas, bbox, tgroup, true);
     } else {
         canvas->save();
     }
 
 
@@ skipping 1838 matching lines @@
 
     rect = SkRect::MakeWH(width, height);
 
     setup_bitmap(output, (int)SkScalarToDouble(width), (int)SkScalarToDouble(height));
 
     SkAutoTUnref<SkDevice> device(SkNEW_ARGS(SkDevice, (*output)));
     SkCanvas canvas(device);
 
     return renderer.renderPage(page, &canvas, rect);
 }