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

src/effects/SkLightingImageFilter.cpp

 /*
  * Copyright 2012 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 "SkLightingImageFilter.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 1154 matching lines @@
 void SkDiffuseLightingImageFilter::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writeScalar(fKD);
 }
 
 bool SkDiffuseLightingImageFilter::onFilterImage(Proxy* proxy,
                                                  const SkBitmap& source,
                                                  const Context& ctx,
                                                  SkBitmap* dst,
                                                  SkIPoint* offset) const {
-    SkImageFilter* input = getInput(0);
     SkBitmap src = source;
     SkIPoint srcOffset = SkIPoint::Make(0, 0);
-    if (input && !input->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 bounds;
     if (!this->applyCropRect(ctx, proxy, src, &srcOffset, &bounds, &src)) {
         return false;
     }
@@ skipping 117 matching lines @@
     this->INHERITED::flatten(buffer);
     buffer.writeScalar(fKS);
     buffer.writeScalar(fShininess);
 }
 
 bool SkSpecularLightingImageFilter::onFilterImage(Proxy* proxy,
                                                   const SkBitmap& source,
                                                   const Context& ctx,
                                                   SkBitmap* dst,
                                                   SkIPoint* offset) const {
-    SkImageFilter* input = getInput(0);
     SkBitmap src = source;
     SkIPoint srcOffset = SkIPoint::Make(0, 0);
-    if (input && !input->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 bounds;
     if (!this->applyCropRect(ctx, proxy, src, &srcOffset, &bounds, &src)) {
         return false;
@@ skipping 681 matching lines @@
 
     fsBuilder->codeAppendf("%s(%s)", fLightColorFunc.c_str(), surfaceToLight);
 }
 
 #endif
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkLightingImageFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkDiffuseLightingImageFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkSpecularLightingImageFilter)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END