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

src/effects/SkOffsetImageFilter.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 "SkOffsetImageFilter.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkDevice.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkMatrix.h"
 #include "SkPaint.h"
 
 bool SkOffsetImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& source,
                                         const Context& ctx,
                                         SkBitmap* result,
                                         SkIPoint* offset) const {
-    SkImageFilter* input = getInput(0);
     SkBitmap src = source;
     SkIPoint srcOffset = SkIPoint::Make(0, 0);
 #ifdef SK_DISABLE_OFFSETIMAGEFILTER_OPTIMIZATION
     if (false) {
 #else
     if (!cropRectIsSet()) {
 #endif
-        if (input && !input->filterImage(proxy, source, ctx, &src, &srcOffset)) {
+        if (!this->filterInput(0, proxy, source, ctx, &src, &srcOffset)) {
             return false;
         }
 
         SkVector vec;
         ctx.ctm().mapVectors(&vec, &fOffset, 1);
 
         offset->fX = srcOffset.fX + SkScalarRoundToInt(vec.fX);
         offset->fY = srcOffset.fY + SkScalarRoundToInt(vec.fY);
         *result = src;
     } else {
-        if (input && !input->filterImage(proxy, source, ctx, &src, &srcOffset)) {
+        if (!this->filterInput(0, proxy, source, ctx, &src, &srcOffset)) {
             return false;
         }
 
         SkIRect bounds;
         if (!this->applyCropRect(ctx, src, srcOffset, &bounds)) {
             return false;
         }
 
         SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
         if (nullptr == device.get()) {
@@ skipping 62 matching lines @@
 void SkOffsetImageFilter::toString(SkString* str) const {
     str->appendf("SkOffsetImageFilter: (");
     str->appendf("offset: (%f, %f) ", fOffset.fX, fOffset.fY);
     str->append("input: (");
     if (this->getInput(0)) {
         this->getInput(0)->toString(str);
     }
     str->append("))");
 }
 #endif