1 /*
2  * Copyright 2018 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/SkBlendMode.h"
10 #include "include/core/SkCanvas.h"
11 #include "include/core/SkPaint.h"
12 #include "include/core/SkRect.h"
13 
14 // The root cause of this bug was that when dual source blending was not supported and we made a
15 // copy of the destination to perform blending we would clip the copy bounds to the current clip.
16 // However, it is possible for anti-aliased that are fully contained by the clip in a geometric
17 // sense to actually draw outside the clip in pixel space because we don't consider aa bloat when
18 // determining if the draw is contained by the clip.
19 DEF_SIMPLE_GM(crbug_892988, canvas, 256, 256) {
20     SkPaint paint1;
21     paint1.setStyle(SkPaint::kStroke_Style);
22     paint1.setStrokeWidth(1.f);
23     paint1.setAntiAlias(true);
24     canvas->drawRect(SkRect::MakeLTRB(11.5, 0.5, 245.5, 245.5), paint1);
25     canvas->clipRect(SkRect::MakeLTRB(12, 1, 244, 244), true);
26     SkPaint paint2;
27     // Use src mode with a non-opaque color to produce a blend that can't be handled with
28     // simple blend coefficients.
29     paint2.setColor(0xF0FFFFFF);
30     paint2.setBlendMode(SkBlendMode::kSrc);
31     paint2.setAntiAlias(true);
32     canvas->drawRect(SkRect::MakeLTRB(12, 1, 244, 244), paint2);
33 }
34