Image Filters: refactor all CPU input processing into a filterInput helper function.

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"
@@ skipping 23 matching lines @@
                                     SimpleOffsetFilter::GetFlattenableType());
         }
     };
     static SkImageFilter* Create(SkScalar dx, SkScalar dy, SkImageFilter* input) {
         return new SimpleOffsetFilter(dx, dy, input);
     }
 
     virtual bool onFilterImage(Proxy* proxy, const SkBitmap& src, const Context& ctx,
                                SkBitmap* dst, SkIPoint* offset) const override {
         SkBitmap source = src;
-        SkImageFilter* input = getInput(0);
         SkIPoint srcOffset = SkIPoint::Make(0, 0);
-        if (input && !input->filterImage(proxy, src, ctx, &source, &srcOffset)) {
+        if (!this->filterInput(0, proxy, src, ctx, &source, &srcOffset)) {
             return false;
         }
 
         SkIRect bounds;
         if (!this->applyCropRect(ctx, proxy, source, &srcOffset, &bounds, &source)) {
             return false;
         }
 
         SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
         SkCanvas canvas(device);
@@ skipping 155 matching lines @@
     }
 
     SkAutoTUnref<SkImage> fImage;
 
     typedef GM INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new ImageFiltersGraphGM;)