add repro case for skia:7674

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>

1 files changed, 56 insertions, 0 deletions

diff --git a/gm/pathmeasure.cpp b/gm/pathmeasure.cpp
new file mode 100644
index 0000000000..aa7de87961
--- /dev/null
+++ b/gm/pathmeasure.cpp
@@ -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