Fix zero-sized blur with crop rect.

gm/imagefilterscropped.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkCanvas.h"
 #include "SkColorFilter.h"
@@ skipping 54 matching lines @@
     canvas->drawBitmap(bm, 0, 0, &paint);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 class ImageFiltersCroppedGM : public skiagm::GM {
 public:
     ImageFiltersCroppedGM () {}
 
 protected:
-    virtual SkString onShortName() override {
+    SkString onShortName() override {
         return SkString("imagefilterscropped");
     }
 
-    virtual SkISize onISize() override { return SkISize::Make(400, 880); }
+    SkISize onISize() override { return SkISize::Make(400, 960); }
 
     void make_checkerboard() {
         fCheckerboard.allocN32Pixels(80, 80);
         SkCanvas canvas(fCheckerboard);
         canvas.clear(SK_ColorTRANSPARENT);
         SkPaint darkPaint;
         darkPaint.setColor(sk_tool_utils::color_to_565(0xFF404040));
         SkPaint lightPaint;
         lightPaint.setColor(sk_tool_utils::color_to_565(0xFFA0A0A0));
         for (int y = 0; y < 80; y += 16) {
@@ skipping 34 matching lines @@
             SkIntToScalar(-10), SkIntToScalar(-10)));
 
         SkAutoTUnref<SkImageFilter> cfOffset(SkColorFilterImageFilter::Create(cf.get(), offset.get()));
 
         SkAutoTUnref<SkImageFilter> erodeX(SkErodeImageFilter::Create(8, 0, nullptr, &cropRect));
         SkAutoTUnref<SkImageFilter> erodeY(SkErodeImageFilter::Create(0, 8, nullptr, &cropRect));
 
         SkImageFilter* filters[] = {
             nullptr,
             SkColorFilterImageFilter::Create(cf.get(), nullptr, &cropRect),
+            SkBlurImageFilter::Create(0.0f, 0.0f, nullptr, &cropRect),
             SkBlurImageFilter::Create(1.0f, 1.0f, nullptr, &cropRect),
             SkBlurImageFilter::Create(8.0f, 0.0f, nullptr, &cropRect),
             SkBlurImageFilter::Create(0.0f, 8.0f, nullptr, &cropRect),
             SkBlurImageFilter::Create(8.0f, 8.0f, nullptr, &cropRect),
             SkErodeImageFilter::Create(1, 1, nullptr, &cropRect),
             SkErodeImageFilter::Create(8, 0, erodeY, &cropRect),
             SkErodeImageFilter::Create(0, 8, erodeX, &cropRect),
             SkErodeImageFilter::Create(8, 8, nullptr, &cropRect),
             SkMergeImageFilter::Create(nullptr, cfOffset.get(), SkXfermode::kSrcOver_Mode, &cropRect),
             SkBlurImageFilter::Create(8.0f, 8.0f, nullptr, &bogusRect),
@@ skipping 24 matching lines @@
     }
 
 private:
     SkBitmap fCheckerboard;
     typedef GM INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 DEF_GM( return new ImageFiltersCroppedGM; )