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

src/effects/SkBlurImageFilter.cpp

 /*
  * Copyright 2011 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkBlurImageFilter.h"
 #include "SkColorPriv.h"
@@ skipping 54 matching lines @@
         *lowOffset = *highOffset - 1;
         *kernelSize3 = d + 1;
     }
 }
 
 bool SkBlurImageFilter::onFilterImage(Proxy* proxy,
                                       const SkBitmap& source, const Context& ctx,
                                       SkBitmap* dst, SkIPoint* offset) const {
     SkBitmap src = source;
     SkIPoint srcOffset = SkIPoint::Make(0, 0);
-    if (this->getInput(0) &&
-        !this->getInput(0)->filterImage(proxy, source, ctx, &src, &srcOffset)) {
+    if (!this->filterInput(0, proxy, source, ctx, &src, &srcOffset)) {
         return false;
     }
 
     if (src.colorType() != kN32_SkColorType) {
         return false;
     }
 
     SkIRect srcBounds, dstBounds;
     if (!this->applyCropRect(ctx, proxy, src, &srcOffset, &srcBounds, &src)) {
         return false;
@@ skipping 144 matching lines @@
     str->appendf("SkBlurImageFilter: (");
     str->appendf("sigma: (%f, %f) input (", fSigma.fWidth, fSigma.fHeight);
 
     if (this->getInput(0)) {
         this->getInput(0)->toString(str);
     }
 
     str->append("))");
 }
 #endif