35 lines
1.3 KiB
C++
35 lines
1.3 KiB
C++
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/*
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* Copyright 2020 Google LLC
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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/SkPaint.h"
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#include "include/core/SkRect.h"
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#include "include/effects/SkImageFilters.h"
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static void drawOne(SkCanvas* canvas, SkRect rect, float saveBorder, float sigma, SkColor c) {
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SkPaint sp;
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sp.setImageFilter(SkImageFilters::Blur(sigma, sigma, SkTileMode::kClamp, nullptr));
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SkPaint p;
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p.setColor(c);
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p.setAntiAlias(true);
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canvas->saveLayer(rect.makeOutset(saveBorder, saveBorder), &sp);
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canvas->drawRect(rect, p);
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canvas->restore();
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}
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DEF_SIMPLE_GM(crbug_1156804, canvas, 250, 250) {
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drawOne(canvas, SkRect::MakeXYWH( 64, 64, 25, 25), 1, 3, SK_ColorGREEN);
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drawOne(canvas, SkRect::MakeXYWH(164, 64, 25, 25), 30, 3, SK_ColorGREEN);
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// This one would draw incorrectly because the large sigma causes downscaling of the source
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// and the one-pixel border would make the downscaled image not contain trans-black at the
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// edges. Combined with the clamp mode on the blur filter it would "harden" the edge.
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drawOne(canvas, SkRect::MakeXYWH( 64, 164, 25, 25), 1, 20, SK_ColorRED);
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drawOne(canvas, SkRect::MakeXYWH(164, 164, 25, 25), 30, 20, SK_ColorGREEN);
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}
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