pdfviewer: when q start, and an operator is called, it should not be able to see operands before q.…

experimental/PdfViewer/SkPdfFont.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 SkPdfFont_DEFINED
 #define SkPdfFont_DEFINED
 
@@ skipping 193 matching lines @@
             for (int i = 0; i < textIn.len; i++) {
                 textOut->text[i] = fToUnicode->fCMapEncoding[textIn.text[i]];
             }
         } else {
             textOut->text = textIn.text;
             textOut->len = textIn.len;
         }
     };
 
     inline unsigned int ToUnicode(unsigned int ch) const {
-        if (fToUnicode) {
+        if (fToUnicode && fToUnicode->fCMapEncoding) {
             return fToUnicode->fCMapEncoding[ch];
         } else {
             return ch;
         }
     };
 
     static SkPdfFont* fontFromPdfDictionary(SkPdfNativeDoc* doc, SkPdfFontDictionary* dict);
     static SkPdfFont* Default() {return fontFromName(NULL, NULL, "TimesNewRoman");}
 
     static SkPdfType0Font* fontFromType0FontDictionary(SkPdfNativeDoc* doc, SkPdfType0FontDictionary* dict);
@@ skipping 216 matching lines @@
                              SkDoubleToScalar(0.0));
         return fChars[ch - fFirstChar].fWidth;
     }
 
     virtual void afterWord(SkPaint* paint, SkMatrix* matrix) {
 
     }
 };
 
 #endif  // SkPdfFont_DEFINED