diff options
| -rw-r--r-- | gm/blurpositioning.cpp | 36 | ||||
| -rw-r--r-- | gn/gm.gni | 1 |
2 files changed, 37 insertions, 0 deletions
diff --git a/gm/blurpositioning.cpp b/gm/blurpositioning.cpp new file mode 100644 index 0000000000..23bacdcceb --- /dev/null +++ b/gm/blurpositioning.cpp @@ -0,0 +1,36 @@ +/* + * Copyright 2017 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 "SkBlurImageFilter.h" + +// For all sigma, the black box should be centered in the red outline. For small sigma, +// the rectangle is not blurred, but still must be centered properly. + +DEF_SIMPLE_GM(check_small_sigma_offset, canvas, 200, 1200) { + + for (auto sigma : {0.0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1.0, 1.2}) { + // border calculation from SkBlurImageFilter + int border = SkScalarCeilToInt(sigma * 3); + + SkRect r = SkRect::MakeXYWH(50, 50, 100, 50); + SkRect b = r.makeOutset(border + 1, border + 1); + b.inset(0.5f, 0.5f); + SkPaint p; + p.setColor(SK_ColorRED); + p.setStyle(SkPaint::Style::kStroke_Style); + + canvas->drawRect(b, p); + + p.reset(); + p.setColor(SK_ColorBLACK); + p.setImageFilter(SkBlurImageFilter::Make(sigma, sigma, nullptr)); + canvas->drawRect(r, p); + + canvas->translate(0, 100); + } +} @@ -51,6 +51,7 @@ gm_sources = [ "$_gm/blurredclippedcircle.cpp", "$_gm/blurroundrect.cpp", "$_gm/blurs.cpp", + "$_gm/blurpositioning.cpp", "$_gm/blurtextsmallradii.cpp", "$_gm/bmpfilterqualityrepeat.cpp", "$_gm/bug5252.cpp", |