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

src/effects/SkXfermodeImageFilter.cpp

 /*
  * Copyright 2013 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 "SkXfermodeImageFilter.h"
 #include "SkCanvas.h"
 #include "SkDevice.h"
@@ skipping 32 matching lines @@
     this->INHERITED::flatten(buffer);
     buffer.writeFlattenable(fMode);
 }
 
 bool SkXfermodeImageFilter::onFilterImage(Proxy* proxy,
                                             const SkBitmap& src,
                                             const Context& ctx,
                                             SkBitmap* dst,
                                             SkIPoint* offset) const {
     SkBitmap background = src, foreground = src;
-    SkImageFilter* backgroundInput = this->getInput(0);
-    SkImageFilter* foregroundInput = this->getInput(1);
     SkIPoint backgroundOffset = SkIPoint::Make(0, 0);
-    if (backgroundInput &&
-        !backgroundInput->filterImage(proxy, src, ctx, &background, &backgroundOffset)) {
+    if (!this->filterInput(0, proxy, src, ctx, &background, &backgroundOffset)) {
         background.reset();
     }
     SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
-    if (foregroundInput &&
-        !foregroundInput->filterImage(proxy, src, ctx, &foreground, &foregroundOffset)) {
+    if (!this->filterInput(1, proxy, src, ctx, &foreground, &foregroundOffset)) {
         foreground.reset();
     }
 
     SkIRect bounds, foregroundBounds;
     if (!applyCropRect(ctx, foreground, foregroundOffset, &foregroundBounds)) {
         foregroundBounds.setEmpty();
         foreground.reset();
     }
     if (!applyCropRect(ctx, background, backgroundOffset, &bounds)) {
         bounds.setEmpty();
@@ skipping 133 matching lines @@
                           SkMatrix::I(), srcRect);
 
     offset->fX = backgroundOffset.fX;
     offset->fY = backgroundOffset.fY;
     WrapTexture(dst, src.width(), src.height(), result);
     return true;
 }
 
 #endif