1 /*
2 * Copyright 2020 Google LLC
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/SkPaint.h"
11 #include "include/core/SkRect.h"
12 #include "include/effects/SkImageFilters.h"
13
drawOne(SkCanvas * canvas,SkRect rect,float saveBorder,float sigma,SkColor c)14 static void drawOne(SkCanvas* canvas, SkRect rect, float saveBorder, float sigma, SkColor c) {
15 SkPaint sp;
16 sp.setImageFilter(SkImageFilters::Blur(sigma, sigma, SkTileMode::kClamp, nullptr));
17 SkPaint p;
18 p.setColor(c);
19 p.setAntiAlias(true);
20
21 canvas->saveLayer(rect.makeOutset(saveBorder, saveBorder), &sp);
22 canvas->drawRect(rect, p);
23 canvas->restore();
24 }
25
26 DEF_SIMPLE_GM(crbug_1156804, canvas, 250, 250) {
27 drawOne(canvas, SkRect::MakeXYWH( 64, 64, 25, 25), 1, 3, SK_ColorGREEN);
28 drawOne(canvas, SkRect::MakeXYWH(164, 64, 25, 25), 30, 3, SK_ColorGREEN);
29 // This one would draw incorrectly because the large sigma causes downscaling of the source
30 // and the one-pixel border would make the downscaled image not contain trans-black at the
31 // edges. Combined with the clamp mode on the blur filter it would "harden" the edge.
32 drawOne(canvas, SkRect::MakeXYWH( 64, 164, 25, 25), 1, 20, SK_ColorRED);
33 drawOne(canvas, SkRect::MakeXYWH(164, 164, 25, 25), 30, 20, SK_ColorGREEN);
34 }
35