xref: /third_party/skia/gm/crbug_1177833.cpp (revision cb93a386) 
1/*
2 * Copyright 2021 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/SkMatrix.h"
11#include "include/core/SkRect.h"
12
13// Bad quads dumped from SkiaRenderer in crbug.com/1178833. These should all draw as really thin
14// lines.
15DEF_SIMPLE_GM(crbug_1177833, canvas, 400, 400) {
16    canvas->clear(SK_ColorBLACK);
17    canvas->translate(-700, -700);
18    // This quad had two issues. The inset collapsed the inner 2D projected quad to a point but
19    // didn't enable enough degrees of freedom to adjust the 4 3D points to project to that point.
20    // Also, the outset produced a 2D projected point far away from the original quad but the
21    // shader was not checking the geometric subset and so pixels far away from the projection of
22    // the quad would have positive coverage.
23    {
24        canvas->save();
25        canvas->concat(SkMatrix::MakeAll(SkBits2Float(0xbf79250e), SkBits2Float(0x3e9da860), SkBits2Float(0x44914c8a),
26                                         SkBits2Float(0xbf982962), SkBits2Float(0xbf280002), SkBits2Float(0x44c3116e),
27                                         SkBits2Float(0xba9bfe62), SkBits2Float(0x39d10455), SkBits2Float(0x3fc9b377)));
28        SkRect rect = {SkBits2Float(0x00000000),
29                       SkBits2Float(0x00000000),
30                       SkBits2Float(0x40a00000),
31                       SkBits2Float(0x43560000)};
32        SkPoint clip[4] = {{SkBits2Float(0x409fff57), SkBits2Float(0x40c86a18)},
33                           {SkBits2Float(0x409fff57), SkBits2Float(0x4314dc8c)},
34                           {SkBits2Float(0x407f6b0d), SkBits2Float(0x43157fff)},
35                           {SkBits2Float(0x4040859c), SkBits2Float(0x43140374)}};
36        SkCanvas::QuadAAFlags aaFlags = static_cast<SkCanvas::QuadAAFlags>(0x00000002);
37        SkColor4f color = {SkBits2Float(0x3f6eeef0),
38                           SkBits2Float(0x3f6eeef0),
39                           SkBits2Float(0x3f6eeef0),
40                           SkBits2Float(0x3f800000)};
41        SkBlendMode mode = static_cast<SkBlendMode>(0x00000003);
42        canvas->experimental_DrawEdgeAAQuad(rect, clip, aaFlags, color, mode);
43        canvas->restore();
44    }
45    // This quad also exposed the inset collapse to a point without enough degrees of freedom issue.
46    canvas->save();
47    canvas->translate(-300, 0);
48    {
49        canvas->save();
50        canvas->concat(SkMatrix::MakeAll(SkBits2Float(0x3f54dd8a), SkBits2Float(0xbf9096a4), SkBits2Float(0x447eae34),
51                                         SkBits2Float(0x3f3f6905), SkBits2Float(0xbe5208ba), SkBits2Float(0x4418118b),
52                                         SkBits2Float(0x3aa134a1), SkBits2Float(0xb93ef249), SkBits2Float(0x3f580bd4)));
53        SkRect rect = {SkBits2Float(0x00000000),
54                       SkBits2Float(0x00000000),
55                       SkBits2Float(0x40a00000),
56                       SkBits2Float(0x43560000)};
57        SkPoint clip[4] = {{SkBits2Float(0x40a0000e), SkBits2Float(0x40c86b5a)},
58                           {SkBits2Float(0x40a0001e), SkBits2Float(0x4314dd5f)},
59                           {SkBits2Float(0x407f76eb), SkBits2Float(0x431580c2)},
60                           {SkBits2Float(0x404092e7), SkBits2Float(0x43140445)}};
61        SkCanvas::QuadAAFlags aaFlags = static_cast<SkCanvas::QuadAAFlags>(0x00000002);
62        SkColor4f color = {SkBits2Float(0x3f6eeef0),
63                           SkBits2Float(0x3f6eeef0),
64                           SkBits2Float(0x3f6eeef0),
65                           SkBits2Float(0x3f800000)};
66        SkBlendMode mode = static_cast<SkBlendMode>(0x00000003);
67        canvas->experimental_DrawEdgeAAQuad(rect, clip, aaFlags, color, mode);
68        canvas->restore();
69    }
70    canvas->restore();
71    // This quad exposed a similar issue to the point issue above, but when collapsing to a
72    // triangle. When a 2D quad edge collapsed from insetting we'd replace it with a point off of
73    // its adjacent edges. We need to ensure the code that moves the 3D point that projects to
74    // the 2D point has 2 degrees of freedom so it can find the correct 3D point.
75    {
76        canvas->save();
77        canvas->concat(SkMatrix::MakeAll(SkBits2Float(0x3f54b255), SkBits2Float(0x3eb5a94d), SkBits2Float(0x443d7419),
78                                         SkBits2Float(0x3f885d66), SkBits2Float(0x3f5a6b9c), SkBits2Float(0x443c7334),
79                                         SkBits2Float(0x3aa95ea5), SkBits2Float(0xb8a1391e), SkBits2Float(0x3f84dde5)));
80        SkRect rect = {SkBits2Float(0x00000000),
81                       SkBits2Float(0x00000000),
82                       SkBits2Float(0x40a00000),
83                       SkBits2Float(0x43100000)};
84        SkPoint clip[4] = {{SkBits2Float(0x405a654c), SkBits2Float(0x42e8c790)},
85                           {SkBits2Float(0x3728c61b), SkBits2Float(0x42e7df31)},
86                           {SkBits2Float(0xb678ecc5), SkBits2Float(0x412db4e0)},
87                           {SkBits2Float(0x4024b2ad), SkBits2Float(0x413ab3ed)}};
88        SkCanvas::QuadAAFlags aaFlags = static_cast<SkCanvas::QuadAAFlags>(0x00000004);
89        SkColor4f color = {SkBits2Float(0x3f800000),
90                           SkBits2Float(0x3f800000),
91                           SkBits2Float(0x3f800000),
92                           SkBits2Float(0x3f800000)};
93        SkBlendMode mode = static_cast<SkBlendMode>(0x00000003);
94        canvas->experimental_DrawEdgeAAQuad(rect, clip, aaFlags, color, mode);
95        canvas->restore();
96    }
97}
98
99