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