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author | Andrea Canciani <ranma42@gmail.com> | 2010-12-01 16:16:00 +0100 |
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committer | Andrea Canciani <ranma42@gmail.com> | 2010-12-09 17:33:12 +0100 |
commit | 17fef8c437483ca082226b41e1850eb383f0251a (patch) | |
tree | d1df002a6e04cd4e695e806220f9ce229a9dfe93 /test/arc-infinite-loop.c | |
parent | 670eb260eb2f0cbe897ce92d3a7ab4542fb17307 (diff) | |
download | cairo-17fef8c437483ca082226b41e1850eb383f0251a.tar.gz |
test: Add arc-infinite-loop
The handling of angles above 2pi in cairo_arc is not very solid and is
basically untested.
This test should ensure that huge inputs don't hang cairo.
Diffstat (limited to 'test/arc-infinite-loop.c')
-rw-r--r-- | test/arc-infinite-loop.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/test/arc-infinite-loop.c b/test/arc-infinite-loop.c new file mode 100644 index 000000000..e648c70ac --- /dev/null +++ b/test/arc-infinite-loop.c @@ -0,0 +1,59 @@ +/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */ +/* + * Copyright 2010 Andrea Canciani + * + * Permission is hereby granted, free of charge, to any person + * obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, copy, + * modify, merge, publish, distribute, sublicense, and/or sell copies + * of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * Author: Andrea Canciani <ranma42@gmail.com> + */ + +#include "cairo-test.h" +#include <float.h> + +#define SIZE 8 + +/* + cairo_arc can hang in an infinite loop if given huge (so big that + adding/subtracting 4*M_PI to them doesn't change the value because + of floating point rounding). + + The purpose of this test is to check that cairo doesn't hang or crash. +*/ + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + cairo_set_source_rgb (cr, 1, 1, 1); + cairo_paint (cr); + + /* Check if the code that guarantees start <= end hangs */ + cairo_arc (cr, 0, 0, 1, 1024 / DBL_EPSILON * M_PI, 0); + + /* Check if the code that handles huge angles hangs */ + cairo_arc (cr, 0, 0, 1, 0, 1024 / DBL_EPSILON * M_PI); +} + +CAIRO_TEST (arc_infinite_loop, + "Test cairo_arc with huge angles", + "arc", /* keywords */ + NULL, /* requirements */ + SIZE, SIZE, + NULL, draw) |