Reland of Implement canComputeFastBounds() for image filters.

gm/colorfilterimagefilter.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 "SkCanvas.h"
 #include "SkColorMatrixFilter.h"
@@ skipping 27 matching lines @@
     matrix[0] = matrix[5] = matrix[10] = 0.2126f;
     matrix[1] = matrix[6] = matrix[11] = 0.7152f;
     matrix[2] = matrix[7] = matrix[12] = 0.0722f;
     matrix[18] = 1.0f;
     SkAutoTUnref<SkColorFilter> filter(SkColorMatrixFilter::Create(matrix));
     return SkColorFilterImageFilter::Create(filter, input);
 }
 
 static SkImageFilter* make_mode_blue(SkImageFilter* input = NULL) {
     SkAutoTUnref<SkColorFilter> filter(
-        SkColorFilter::CreateModeFilter(SK_ColorBLUE, SkXfermode::kSrcIn_Mode));
+        SkColorFilter::CreateModeFilter(SK_ColorBLUE, SkXfermode::kSrc_Mode));
     return SkColorFilterImageFilter::Create(filter, input);
 }
 
 class ColorFilterImageFilterGM : public skiagm::GM {
 public:
     ColorFilterImageFilterGM () {}
 
 protected:
 
     virtual SkString onShortName() {
@@ skipping 54 matching lines @@
             drawClippedRect(canvas, r, paint);
             canvas->translate(FILTER_WIDTH + MARGIN, 0);
         }
         {
             SkAutoTUnref<SkImageFilter> blur(make_blur(3.0f));
             SkAutoTUnref<SkImageFilter> brightness(make_brightness(0.5f, blur));
             paint.setImageFilter(brightness);
             drawClippedRect(canvas, r, paint, 3);
             canvas->translate(FILTER_WIDTH + MARGIN, 0);
         }
+        {
+            SkAutoTUnref<SkImageFilter> blue(make_mode_blue());
+            paint.setImageFilter(blue.get());
+            drawClippedRect(canvas, r, paint, 5);
+            canvas->translate(FILTER_WIDTH + MARGIN, 0);
+        }
     }
 
 private:
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static skiagm::GM* MyFactory(void*) { return new ColorFilterImageFilterGM; }
 static skiagm::GMRegistry reg(MyFactory);