1 /* 2 * Copyright 2017 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "gm/gm.h" 9 #include "include/core/SkCanvas.h" 10 #include "include/core/SkColor.h" 11 #include "include/core/SkImageFilter.h" 12 #include "include/core/SkPaint.h" 13 #include "include/core/SkRect.h" 14 #include "include/core/SkScalar.h" 15 #include "include/effects/SkImageFilters.h" 16 17 #include <initializer_list> 18 19 // For all sigma, the black box should be centered in the red outline. For small sigma, 20 // the rectangle is not blurred, but still must be centered properly. 21 22 DEF_SIMPLE_GM(check_small_sigma_offset, canvas, 200, 1200) { 23 24 for (auto sigma : {0.0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1.0, 1.2}) { 25 // border calculation from SkBlurImageFilter 26 int border = SkScalarCeilToInt(sigma * 3); 27 28 SkRect r = SkRect::MakeXYWH(50, 50, 100, 50); 29 SkRect b = r.makeOutset(border + 1, border + 1); 30 b.inset(0.5f, 0.5f); 31 SkPaint p; 32 p.setColor(SK_ColorRED); 33 p.setStyle(SkPaint::Style::kStroke_Style); 34 35 canvas->drawRect(b, p); 36 37 p.reset(); 38 p.setColor(SK_ColorBLACK); 39 p.setImageFilter(SkImageFilters::Blur(sigma, sigma, nullptr)); 40 canvas->drawRect(r, p); 41 42 canvas->translate(0, 100); 43 } 44 } 45