Image filters: implement offsets in GPU path.

src/effects/SkBicubicImageFilter.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 "SkBicubicImageFilter.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 323 matching lines @@
                                          GrTexture* textures[]) {
     int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx :
                                       GrEffectUnitTest::kAlphaTextureIdx;
     SkScalar coefficients[16];
     for (int i = 0; i < 16; i++) {
         coefficients[i] = random->nextSScalar1();
     }
     return GrBicubicEffect::Create(textures[texIdx], coefficients);
 }
 
-bool SkBicubicImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBitmap* result) {
+bool SkBicubicImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBitmap* result, SkIPoint* offset) {
     SkBitmap srcBM;
-    if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, &srcBM)) {
+    if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, &srcBM, offset)) {
         return false;
     }
     GrTexture* srcTexture = srcBM.getTexture();
     GrContext* context = srcTexture->getContext();
 
     SkRect dstRect = SkRect::MakeWH(srcBM.width() * fScale.fWidth,
                                     srcBM.height() * fScale.fHeight);
 
     GrTextureDesc desc;
     desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
@@ skipping 10 matching lines @@
     GrPaint paint;
     paint.colorStage(0)->setEffect(GrBicubicEffect::Create(srcTexture, fCoefficients))->unref();
     SkRect srcRect;
     srcBM.getBounds(&srcRect);
     context->drawRectToRect(paint, dstRect, srcRect);
     return SkImageFilterUtils::WrapTexture(dst, desc.fWidth, desc.fHeight, result);
 }
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////