Image filters: refactor input GPU processing into filterInputGPU().

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 112 matching lines @@
     return fMode && fMode->asFragmentProcessor(nullptr, nullptr) && !cropRectIsSet();
 }
 
 bool SkXfermodeImageFilter::filterImageGPU(Proxy* proxy,
                                            const SkBitmap& src,
                                            const Context& ctx,
                                            SkBitmap* result,
                                            SkIPoint* offset) const {
     SkBitmap background = src;
     SkIPoint backgroundOffset = SkIPoint::Make(0, 0);
-    if (this->getInput(0) && 
-        !this->getInput(0)->getInputResultGPU(proxy, src, ctx, &background, &backgroundOffset)) {
+    if (!this->filterInputGPU(0, proxy, src, ctx, &background, &backgroundOffset)) {
         return false;
     }
 
     GrTexture* backgroundTex = background.getTexture();
     if (nullptr == backgroundTex) {
         SkASSERT(false);
         return false;
     }
 
     SkBitmap foreground = src;
     SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
-    if (this->getInput(1) && 
-        !this->getInput(1)->getInputResultGPU(proxy, src, ctx, &foreground, &foregroundOffset)) {
+    if (!this->filterInputGPU(1, proxy, src, ctx, &foreground, &foregroundOffset)) {
         return false;
     }
     GrTexture* foregroundTex = foreground.getTexture();
     GrContext* context = foregroundTex->getContext();
 
     const GrFragmentProcessor* xferFP = nullptr;
 
     GrSurfaceDesc desc;
     desc.fFlags = kRenderTarget_GrSurfaceFlag;
     desc.fWidth = src.width();
@@ skipping 43 matching lines @@
     drawContext->drawRect(GrClip::WideOpen(), paint, SkMatrix::I(), srcRect);
 
     offset->fX = backgroundOffset.fX;
     offset->fY = backgroundOffset.fY;
     WrapTexture(dst, src.width(), src.height(), result);
     return true;
 }
 
 #endif