pdfviewer: track what objects have been used during rendering. It will be the base of reporting unu…

experimental/PdfViewer/pdfparser/native/SkPdfNativeObject.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 "SkPdfNativeObject.h"
 
 // TODO(edisonn): mac builder does not find the header ... but from headers is ok
@@ skipping 48 matching lines @@
     if (strcmp(name, "FlateDecode") == 0) {
         return applyFlateDecodeFilter();
     } else if (strcmp(name, "DCTDecode") == 0) {
         return applyDCTDecodeFilter();
     }
     // TODO(edisonn): allert, not supported, but should be implemented asap
     return false;
 }
 
 bool SkPdfNativeObject::filterStream() {
+    SkPdfMarkObjectUsed();
+
     if (!hasStream()) {
         return false;
     }
 
     if (isStreamFiltered()) {
         return true;
     }
 
     SkPdfStreamCommonDictionary* stream = (SkPdfStreamCommonDictionary*)this;
 
@@ skipping 14 matching lines @@
             } else {
                 // TODO(edisonn): report warning
             }
         }
     }
 
     return true;
 }
 
 void SkPdfNativeObject::releaseData() {
+    // TODO(edisonn): report here unused objects
+
+    SkPdfMarkObjectUnused();
+
     if (fData) {
         switch (fDataType) {
             case kFont_Data:
                 delete (SkPdfFont*)fData;
                 break;
             case kBitmap_Data:
                 delete (SkBitmap*)fData;
                 break;
             default:
                 SkASSERT(false);
                 break;
         }
     }
     fData = NULL;
     fDataType = kEmpty_Data;
 }