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 "include/core/SkCanvas.h"
9 #include "include/core/SkPaint.h"
10 #include "include/core/SkPathBuilder.h"
11 #include "include/core/SkPathEffect.h"
12 #include "include/core/SkTypes.h"
13 #include "include/effects/SkDashPathEffect.h"
14
15 // Repro case for skia:7674. Requires lots of RAM to run, and currently triggers UB:
16 // ../include/private/SkTDArray.h:382:26:
17 // runtime error: signed integer overflow: 2147483644 + 4 cannot be represented in type 'int'
18
path_measure_explosion(SkCanvas * canvas)19 static SK_UNUSED void path_measure_explosion(SkCanvas* canvas) {
20 SkPaint p;
21 p.setAntiAlias(false);
22 float intervals[] = { 0, 10e9f };
23 p.setStyle(SkPaint::kStroke_Style);
24 p.setPathEffect(SkDashPathEffect::Make(intervals, SK_ARRAY_COUNT(intervals), 0));
25
26 int quadratic_at[] = {
27 13, 68, 258, 1053, 1323, 2608, 10018, 15668, 59838, 557493, 696873, 871098, 4153813,
28 15845608, 48357008, 118059138, 288230353, 360287948, 562949933, 703687423, 1099511613, 0
29 };
30 int next_quadratic_at = 0;
31
32 SkPathBuilder path;
33 path.moveTo(0, 0);
34
35 int i = 1;
36 for (int points = 1; points < 2147483647; ) {
37 if (points == quadratic_at[next_quadratic_at]) {
38 path.quadTo(i, 0, i, 0);
39 next_quadratic_at++;
40 points += 2;
41 } else {
42 path.lineTo(i, 0);
43 points += 1;
44 }
45
46 i++;
47
48 if (i == 1000000) {
49 path.moveTo(0, 0);
50 points += 1;
51 i = 1;
52 }
53 }
54 canvas->drawPath(path.detach(), p);
55 }
56
57 #if 0
58 #include "gm/gm.h"
59 DEF_SIMPLE_GM(PathMeasure_explosion, canvas, 500,500) {
60 path_measure_explosion(canvas);
61 }
62 #endif
63