Fix for crash on large image blur sigma values.

tests/ImageFilterTest.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * 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 "SkBitmapDevice.h"
@@ skipping 277 matching lines @@
     recordingCanvas->save();
     recordingCanvas->scale(SkIntToScalar(10), SkIntToScalar(10));
     recordingCanvas->drawRect(SkRect::Make(SkIRect::MakeWH(100, 100)), solidPaint);
     recordingCanvas->restore(); // scale
     recordingCanvas->restore(); // saveLayer
     picture.endRecording();
 
     canvas.drawPicture(picture);
 }
 
+void test_huge_blur(SkBaseDevice* device, skiatest::Reporter* reporter) {
+    SkCanvas canvas(device);
+
+    SkBitmap bitmap;
+    bitmap.allocN32Pixels(100, 100);
+    bitmap.eraseARGB(0, 0, 0, 0);
+
+    // Check that a blur with an insane radius does not crash or assert.
+    SkAutoTUnref<SkImageFilter> blur(SkBlurImageFilter::Create(SkIntToScalar(1<<30), SkIntToScalar(1<<30)));
+
+    SkPaint paint;
+    paint.setImageFilter(blur);
+    canvas.drawSprite(bitmap, 0, 0, &paint);
+}
+
+DEF_TEST(HugeBlurImageFilter, reporter) {
+    SkBitmap temp;
+    temp.allocN32Pixels(100, 100);
+    SkBitmapDevice device(temp);
+    test_huge_blur(&device, reporter);
+}
+
+
 #if SK_SUPPORT_GPU
 DEF_GPUTEST(ImageFilterCropRectGPU, reporter, factory) {
     GrContext* context = factory->get(static_cast<GrContextFactory::GLContextType>(0));
     SkAutoTUnref<SkGpuDevice> device(SkGpuDevice::Create(context,
                                                          SkImageInfo::MakeN32Premul(100, 100),
                                                          0));
     test_crop_rects(device, reporter);
 }
+
+DEF_GPUTEST(HugeBlurImageFilterGPU, reporter, factory) {
+    GrContext* context = factory->get(static_cast<GrContextFactory::GLContextType>(0));
+    SkAutoTUnref<SkGpuDevice> device(SkGpuDevice::Create(context,
+                                                         SkImageInfo::MakeN32Premul(100, 100),
+                                                         0));
+    test_huge_blur(device, reporter);
+}
 #endif