add peekPixels to SkCanvas and SkSurface

gm/imagefiltersgraph.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 
 #include "SkArithmeticMode.h"
+#include "SkDevice.h"
 #include "SkBitmapSource.h"
 #include "SkBlurImageFilter.h"
 #include "SkColorFilter.h"
 #include "SkColorFilterImageFilter.h"
 #include "SkColorMatrixFilter.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkMergeImageFilter.h"
 #include "SkMorphologyImageFilter.h"
 #include "SkOnce.h"
@@ skipping 65 matching lines @@
         SkOnce(&once, init_flattenable, &dummy);
     }
 
 protected:
     virtual SkString onShortName() {
         return SkString("imagefiltersgraph");
     }
 
     void make_bitmap() {
         fBitmap.allocN32Pixels(100, 100);
-        SkBitmapDevice device(fBitmap);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(fBitmap);
         canvas.clear(0x00000000);
         SkPaint paint;
         paint.setAntiAlias(true);
         paint.setColor(0xFFFFFFFF);
         paint.setTextSize(SkIntToScalar(96));
         const char* str = "e";
         canvas.drawText(str, strlen(str), SkIntToScalar(20), SkIntToScalar(70), paint);
     }
 
     void drawClippedBitmap(SkCanvas* canvas, const SkBitmap& bitmap, const SkPaint& paint) {
@@ skipping 98 matching lines @@
 private:
     typedef GM INHERITED;
     SkBitmap fBitmap;
     bool fInitialized;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static skiagm::GM* MyFactory(void*) { return new ImageFiltersGraphGM; }
 static skiagm::GMRegistry reg(MyFactory);