Image filters: implement offsets in GPU path.

src/effects/SkMorphologyImageFilter.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 "SkMorphologyImageFilter.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 484 matching lines @@
         apply_morphology_pass(context, srcTexture, rect, radius.fHeight,
                               morphType, Gr1DKernelEffect::kY_Direction);
         srcTexture->unref();
         srcTexture = ast.detach();
     }
     return srcTexture;
 }
 
 };
 
-bool SkDilateImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBitmap* result) {
+bool SkDilateImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBitmap* result,
+                                         SkIPoint* offset) {
     SkBitmap inputBM;
-    if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, &inputBM)) {
+    if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, &inputBM, offset)) {
         return false;
     }
     GrTexture* input = inputBM.getTexture();
     SkIRect bounds;
     src.getBounds(&bounds);
     SkAutoTUnref<GrTexture> resultTex(apply_morphology(input, bounds,
         GrMorphologyEffect::kDilate_MorphologyType, radius()));
     return SkImageFilterUtils::WrapTexture(resultTex, src.width(), src.height(), result);
 }
 
-bool SkErodeImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBitmap* result) {
+bool SkErodeImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBitmap* result,
+                                        SkIPoint* offset) {
     SkBitmap inputBM;
-    if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, &inputBM)) {
+    if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, &inputBM, offset)) {
         return false;
     }
     GrTexture* input = inputBM.getTexture();
     SkIRect bounds;
     src.getBounds(&bounds);
     SkAutoTUnref<GrTexture> resultTex(apply_morphology(input, bounds,
         GrMorphologyEffect::kErode_MorphologyType, radius()));
     return SkImageFilterUtils::WrapTexture(resultTex, src.width(), src.height(), result);
 }
 
 #endif