use SkStream factory for files, and check for null (file-not-found) speedup sampleapp's animation

samplecode/SamplePicture.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SampleCode.h"
 #include "SkDumpCanvas.h"
 #include "SkView.h"
@@ skipping 15 matching lines @@
 #include "SkXfermode.h"
 
 #include "SkStream.h"
 #include "SkXMLParser.h"
 
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "SkImageRef_GlobalPool.h"
 
 static SkBitmap load_bitmap() {
-    SkStream* stream = new SkFILEStream("/skimages/sesame_street_ensemble-hp.jpg");
-    SkAutoUnref aur(stream);
+    SkBitmap bm;
+    SkStream* stream = SkStream::NewFromFile("/skimages/sesame_street_ensemble-hp.jpg");
+    if (stream) {
+        SkAutoUnref aur(stream);
 
-    SkBitmap bm;
-    if (SkImageDecoder::DecodeStream(stream, &bm, SkBitmap::kNo_Config,
-                                     SkImageDecoder::kDecodeBounds_Mode)) {
-        SkPixelRef* pr = new SkImageRef_GlobalPool(stream, bm.config(), 1);
-        bm.setPixelRef(pr)->unref();
+        if (SkImageDecoder::DecodeStream(stream, &bm, SkBitmap::kNo_Config,
+                                         SkImageDecoder::kDecodeBounds_Mode)) {
+            SkPixelRef* pr = new SkImageRef_GlobalPool(stream, bm.config(), 1);
+            bm.setPixelRef(pr)->unref();
+        }
     }
     return bm;
 }
 
 static void drawCircle(SkCanvas* canvas, int r, SkColor color) {
     SkPaint paint;
     paint.setAntiAlias(true);
     paint.setColor(color);
 
     canvas->drawCircle(SkIntToScalar(r), SkIntToScalar(r), SkIntToScalar(r),
@@ skipping 135 matching lines @@
     SkPicture*  fPicture;
     SkPicture*  fSubPicture;
 
     typedef SampleView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new PictureView; }
 static SkViewRegister reg(MyFactory);