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add repro case for skia:7674

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Nice to have something to trigger this issue.

Bug: skia:7674

Change-Id: I653699b82f3a8a4d551f3cd98b6a7e7620c6e035
Reviewed-on: https://skia-review.googlesource.com/115920
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
This commit is contained in:
Mike Klein 2018-03-22 11:32:09 -04:00 committed by Skia Commit-Bot
parent 539ebb8f75
commit b18eb3589c
2 changed files with 57 additions and 0 deletions
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56
gm/pathmeasure.cpp Normal file
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@ -0,0 +1,56 @@
/*
* 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 "SkBitmap.h"
#include "SkDashPathEffect.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "gm.h"
// Repro case for skia:7674. Requires lots of RAM to run, and currently triggers UB:
// ../include/private/SkTDArray.h:382:26:
// runtime error: signed integer overflow: 2147483644 + 4 cannot be represented in type 'int'
#if 0
DEF_SIMPLE_GM(PathMeasure_explosion, canvas, 500,500) {
SkPaint p;
p.setAntiAlias(false);
float intervals[] = { 0, 10e9f };
p.setStyle(SkPaint::kStroke_Style);
p.setPathEffect(SkDashPathEffect::Make(intervals, SK_ARRAY_COUNT(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;
SkPath 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, p);
}
#endif

1
gn/gm.gni
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@ -229,6 +229,7 @@ gm_sources = [
"$_gm/pathfill.cpp",
"$_gm/pathinterior.cpp",
"$_gm/pathmaskcache.cpp",
"$_gm/pathmeasure.cpp",
"$_gm/pathopsinverse.cpp",
"$_gm/pathopsskpclip.cpp",
"$_gm/pathreverse.cpp",