Implement support for expanding crop rects in image filters

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 128 matching lines @@
     SkBitmap src = source;
     SkIPoint srcOffset = SkIPoint::Make(0, 0);
     if (getInput(0) && !getInput(0)->filterImage(proxy, source, ctx, &src, &srcOffset)) {
         return false;
     }
 
     if (src.colorType() != kPMColor_SkColorType) {
         return false;
     }
 
+    SkIRect srcBounds, dstBounds;
+    if (!this->applyCropRect(ctx, proxy, src, &srcOffset, &srcBounds, &src)) {
+        return false;
+    }
+
     SkAutoLockPixels alp(src);
     if (!src.getPixels()) {
         return false;
     }
 
-    SkIRect srcBounds, dstBounds;
-    src.getBounds(&srcBounds);
-    srcBounds.offset(srcOffset);
-    if (!this->applyCropRect(&srcBounds, ctx.ctm())) {
-        return false;
-    }
-
     dst->setConfig(src.config(), srcBounds.width(), srcBounds.height());
     dst->getBounds(&dstBounds);
     if (!dst->allocPixels()) {
         return false;
     }
 
     SkVector sigma, localSigma = SkVector::Make(fSigma.width(), fSigma.height());
     ctx.ctm().mapVectors(&sigma, &localSigma, 1);
 
     int kernelSizeX, kernelSizeX3, lowOffsetX, highOffsetX;
@@ skipping 80 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 (getInput(0) && !getInput(0)->getInputResultGPU(proxy, src, ctx, &input, &srcOffset)) {
         return false;
     }
-    GrTexture* source = input.getTexture();
     SkIRect rect;
-    src.getBounds(&rect);
-    rect.offset(srcOffset);
-    if (!this->applyCropRect(&rect, ctx.ctm())) {
+    if (!this->applyCropRect(ctx, proxy, input, &srcOffset, &rect, &input)) {
         return false;
     }
+    GrTexture* source = input.getTexture();
     SkVector sigma, localSigma = SkVector::Make(fSigma.width(), fSigma.height());
     ctx.ctm().mapVectors(&sigma, &localSigma, 1);
     offset->fX = rect.fLeft;
     offset->fY = rect.fTop;
     rect.offset(-srcOffset);
     SkAutoTUnref<GrTexture> tex(SkGpuBlurUtils::GaussianBlur(source->getContext(),
                                                              source,
                                                              false,
                                                              SkRect::Make(rect),
                                                              true,
                                                              sigma.x(),
                                                              sigma.y()));
     WrapTexture(tex, rect.width(), rect.height(), result);
     return true;
 #else
     SkDEBUGFAIL("Should not call in GPU-less build");
     return false;
 #endif
 }