Image filters: implement offsets in GPU path.

src/core/SkImageFilter.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 "SkImageFilter.h"
 
 #include "SkBitmap.h"
@@ skipping 80 matching lines @@
 
 bool SkImageFilter::onFilterImage(Proxy*, const SkBitmap&, const SkMatrix&,
                                   SkBitmap*, SkIPoint*) {
     return false;
 }
 
 bool SkImageFilter::canFilterImageGPU() const {
     return this->asNewEffect(NULL, NULL);
 }
 
-bool SkImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBitmap* result) {
+bool SkImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBitmap* result,
+                                   SkIPoint* offset) {
 #if SK_SUPPORT_GPU
     SkBitmap input;
     SkASSERT(fInputCount == 1);
-    if (!SkImageFilterUtils::GetInputResultGPU(this->getInput(0), proxy, src, &input)) {
+    if (!SkImageFilterUtils::GetInputResultGPU(this->getInput(0), proxy, src, &input, offset)) {
         return false;
     }
     GrTexture* srcTexture = input.getTexture();
     SkRect rect;
     src.getBounds(&rect);
     GrContext* context = srcTexture->getContext();
 
     GrTextureDesc desc;
     desc.fFlags = kRenderTarget_GrTextureFlagBit,
     desc.fWidth = input.width();
@@ skipping 26 matching lines @@
     return true;
 }
 
 bool SkImageFilter::asNewEffect(GrEffectRef**, GrTexture*) const {
     return false;
 }
 
 bool SkImageFilter::asColorFilter(SkColorFilter**) const {
     return false;
 }