Make SkBlurImageFilter capable of cropping during blur (GPU path).

src/effects/SkBlurImageFilter.cpp

 /*
  * Copyright 2011 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 "SkBitmap.h"
 #include "SkBlurImageFilter.h"
 #include "SkColorPriv.h"
@@ skipping 187 matching lines @@
 }
 
 bool SkBlurImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, const Context& ctx,
                                        SkBitmap* result, SkIPoint* offset) const {
 #if SK_SUPPORT_GPU
     SkBitmap input = src;
     SkIPoint srcOffset = SkIPoint::Make(0, 0);
     if (!this->filterInputGPU(0, proxy, src, ctx, &input, &srcOffset)) {
         return false;
     }
-    SkIRect rect;
-    if (!this->applyCropRect(ctx, proxy, input, &srcOffset, &rect, &input)) {
+    SkIRect srcBounds, dstBounds;
+    if (!this->applyCropRect(ctx, input, srcOffset, &dstBounds, &srcBounds)) {
         return false;
     }
     GrTexture* source = input.getTexture();
     SkVector sigma = mapSigma(fSigma, ctx.ctm());
-    offset->fX = rect.fLeft;
-    offset->fY = rect.fTop;
-    rect.offset(-srcOffset);
+    offset->fX = dstBounds.fLeft;
+    offset->fY = dstBounds.fTop;
+    srcBounds.offset(-srcOffset);
+    dstBounds.offset(-srcOffset);
+    SkRect srcBoundsF(SkRect::Make(srcBounds));
     auto constraint = GrTextureProvider::FromImageFilter(ctx.sizeConstraint());
     SkAutoTUnref<GrTexture> tex(SkGpuBlurUtils::GaussianBlur(source->getContext(),
                                                              source,
                                                              false,
-                                                             SkRect::Make(rect),
-                                                             true,
+                                                             SkRect::Make(dstBounds),
+                                                             &srcBoundsF,
                                                              sigma.x(),
                                                              sigma.y(),
                                                              constraint));
     if (!tex) {
         return false;
     }
-    WrapTexture(tex, rect.width(), rect.height(), result);
+    WrapTexture(tex, dstBounds.width(), dstBounds.height(), result);
     return true;
 #else
     SkDEBUGFAIL("Should not call in GPU-less build");
     return false;
 #endif
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkBlurImageFilter::toString(SkString* str) const {
     str->appendf("SkBlurImageFilter: (");
     str->appendf("sigma: (%f, %f) input (", fSigma.fWidth, fSigma.fHeight);
 
     if (this->getInput(0)) {
         this->getInput(0)->toString(str);
     }
 
     str->append("))");
 }
 #endif