45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
/*
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* Copyright 2017 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColor.h"
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#include "include/core/SkImageFilter.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkRect.h"
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#include "include/core/SkScalar.h"
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#include "include/effects/SkImageFilters.h"
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#include <initializer_list>
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// For all sigma, the black box should be centered in the red outline. For small sigma,
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// the rectangle is not blurred, but still must be centered properly.
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DEF_SIMPLE_GM(check_small_sigma_offset, canvas, 200, 1200) {
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for (auto sigma : {0.0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1.0, 1.2}) {
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// border calculation from SkBlurImageFilter
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int border = SkScalarCeilToInt(sigma * 3);
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SkRect r = SkRect::MakeXYWH(50, 50, 100, 50);
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SkRect b = r.makeOutset(border + 1, border + 1);
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b.inset(0.5f, 0.5f);
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SkPaint p;
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p.setColor(SK_ColorRED);
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p.setStyle(SkPaint::Style::kStroke_Style);
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canvas->drawRect(b, p);
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p.reset();
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p.setColor(SK_ColorBLACK);
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p.setImageFilter(SkImageFilters::Blur(sigma, sigma, nullptr));
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canvas->drawRect(r, p);
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canvas->translate(0, 100);
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}
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}
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