test/infinite-join.c

   1 /*
   2  * Copyright © 2006 Red Hat, Inc.
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software
   5  * and its documentation for any purpose is hereby granted without
   6  * fee, provided that the above copyright notice appear in all copies
   7  * and that both that copyright notice and this permission notice
   8  * appear in supporting documentation, and that the name of the
   9  * copyright holders not be used in advertising or publicity
  10  * pertaining to distribution of the software without specific,
  11  * written prior permission. The copyright holders make no
  12  * representations about the suitability of this software for any
  13  * purpose.  It is provided "as is" without express or implied
  14  * warranty.
  15  *
  16  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
  17  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  18  * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
  19  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  20  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
  21  * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  22  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  23  * SOFTWARE.
  24  *
  25  * Author: Carl D. Worth <cworth@cworth.org>
  26  */
  27
  28 /* Test case for bug #8379:
  29  *
  30  *      infinite loop when stroking
  31  *      https://bugs.freedesktop.org/show_bug.cgi?id=8379
  32  */
  33
  34 #include "cairo-test.h"
  35
  36 static cairo_test_draw_function_t draw;
  37
  38 cairo_test_t test = {
  39     "infinite-join",
  40     "Test case for infinite loop when stroking with round joins",
  41     8, 8,
  42     draw
  43 };
  44
  45 static cairo_test_status_t
  46 draw (cairo_t *cr, int width, int height)
  47 {
  48     /* Paint white, then draw in black. */
  49     cairo_set_source_rgb (cr, 1, 1, 1); /* white */
  50     cairo_paint (cr);
  51     cairo_set_source_rgb (cr, 0, 0, 0); /* black */
  52
  53     cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
  54
  55     /* scaling 2 times causes a slight rounding error in the ctm.
  56      * Without that, the bug doesn't happen. */
  57     cairo_scale (cr, 20 / 100., 20 / 100.);
  58     cairo_scale (cr, 1. / 20, 1. / 20);
  59
  60     cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
  61     cairo_set_line_width (cr, 20);
  62
  63     cairo_translate (cr, -18300, -13200);
  64
  65     cairo_new_path (cr);
  66     cairo_move_to (cr, 18928, 13843);
  67     cairo_line_to (cr, 18500, 13843);
  68     cairo_line_to (cr, 18500, 13400);
  69     cairo_line_to (cr, 18928, 13400);
  70     cairo_line_to (cr, 18928, 13843);
  71     cairo_stroke (cr);
  72
  73     return 0;
  74 }
  75
  76 int
  77 main (void)
  78 {
  79     return cairo_test (&test);
  80 }