| /* |
| * Copyright 2018 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPathBuilder.h" |
| #include "include/core/SkPathEffect.h" |
| #include "include/core/SkTypes.h" |
| #include "include/effects/SkDashPathEffect.h" |
| |
| // Repro case for skia:7674. Requires lots of RAM to run, and currently triggers UB: |
| // //include/private/base/SkTDArray.h:382:26: |
| // runtime error: signed integer overflow: 2147483644 + 4 cannot be represented in type 'int' |
| |
| [[maybe_unused]] static void path_measure_explosion(SkCanvas* canvas) { |
| SkPaint p; |
| p.setAntiAlias(false); |
| float intervals[] = { 0, 10e9f }; |
| p.setStyle(SkPaint::kStroke_Style); |
| p.setPathEffect(SkDashPathEffect::Make(intervals, std::size(intervals), 0)); |
| |
| int quadratic_at[] = { |
| 13, 68, 258, 1053, 1323, 2608, 10018, 15668, 59838, 557493, 696873, 871098, 4153813, |
| 15845608, 48357008, 118059138, 288230353, 360287948, 562949933, 703687423, 1099511613, 0 |
| }; |
| int next_quadratic_at = 0; |
| |
| SkPathBuilder path; |
| path.moveTo(0, 0); |
| |
| int i = 1; |
| for (int points = 1; points < 2147483647; ) { |
| if (points == quadratic_at[next_quadratic_at]) { |
| path.quadTo(i, 0, i, 0); |
| next_quadratic_at++; |
| points += 2; |
| } else { |
| path.lineTo(i, 0); |
| points += 1; |
| } |
| |
| i++; |
| |
| if (i == 1000000) { |
| path.moveTo(0, 0); |
| points += 1; |
| i = 1; |
| } |
| } |
| canvas->drawPath(path.detach(), p); |
| } |
| |
| #if 0 |
| #include "gm/gm.h" |
| DEF_SIMPLE_GM(PathMeasure_explosion, canvas, 500,500) { |
| path_measure_explosion(canvas); |
| } |
| #endif |