cairo/test/leaky-dashed-rectangle.c

   1 /*
   2  * Copyright © 2008 Chris Wilson
   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
   9  * Chris Wilson not be used in advertising or publicity pertaining to
  10  * distribution of the software without specific, written prior
  11  * permission. Chris Wilson makes no representations about the
  12  * suitability of this software for any purpose.  It is provided "as
  13  * is" without express or implied warranty.
  14  *
  15  * CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
  16  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  17  * FITNESS, IN NO EVENT SHALL CHRIS WILSON BE LIABLE FOR ANY SPECIAL,
  18  * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
  19  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  20  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
  21  * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  22  *
  23  * Author: Chris Wilson <chris@chris-wilson.co.uk>
  24  *         Franz Schmid <Franz.Schmid@altmuehlnet.de>
  25  */
  26
  27 /* Test case for bug reported by Franz Schmid <Franz.Schmid@altmuehlnet.de>
  28  * http://lists.cairographics.org/archives/cairo/2008-April/013912.html
  29  *
  30  * See also: http://bugs.freedesktop.org/show_bug.cgi?id=17177
  31  */
  32
  33 #include "cairo-test.h"
  34
  35 #define WIDTH 60
  36 #define HEIGHT 60
  37
  38 static cairo_test_draw_function_t draw;
  39
  40 static const cairo_test_t test = {
  41     "leaky-dashed-rectangle",
  42     "Exercises bug in which a dashed stroke leaks in from outside the surface",
  43     WIDTH, HEIGHT,
  44     draw
  45 };
  46
  47 static cairo_test_status_t
  48 draw (cairo_t *cr, int width, int height)
  49 {
  50     const double dash[2] = {4, 2};
  51
  52     cairo_set_source_rgb (cr, 1, 1, 1);
  53     cairo_paint (cr);
  54
  55     cairo_set_source_rgb (cr, 0., 0., 0);
  56
  57     cairo_translate (cr, 0.5, .5);
  58     cairo_set_line_width (cr, 1); /* This is vital to reproduce the bug. */
  59
  60     /* First check simple rectangles */
  61     cairo_set_source_rgb (cr, 0., 0., 0);
  62     cairo_rectangle (cr, -WIDTH/4, -HEIGHT/4, WIDTH, HEIGHT);
  63     cairo_stroke (cr);
  64     cairo_rectangle (cr, WIDTH+WIDTH/4, -HEIGHT/4, -WIDTH, HEIGHT);
  65     cairo_stroke (cr);
  66     cairo_rectangle (cr, -WIDTH/4, HEIGHT+HEIGHT/4, WIDTH, -HEIGHT);
  67     cairo_stroke (cr);
  68     cairo_rectangle (cr, WIDTH+WIDTH/4, HEIGHT+HEIGHT/4, -WIDTH, -HEIGHT);
  69     cairo_stroke (cr);
  70
  71     cairo_set_dash (cr, dash, 2, 0);
  72
  73     /* And now dashed. */
  74     cairo_set_source_rgb (cr, 1., 0., 0);
  75     cairo_rectangle (cr, -WIDTH/4, -HEIGHT/4, WIDTH, HEIGHT);
  76     cairo_stroke (cr);
  77     cairo_set_source_rgb (cr, 0., 1., 0);
  78     cairo_rectangle (cr, WIDTH+WIDTH/4, -HEIGHT/4, -WIDTH, HEIGHT);
  79     cairo_stroke (cr);
  80     cairo_set_source_rgb (cr, 0., 0., 1);
  81     cairo_rectangle (cr, -WIDTH/4, HEIGHT+HEIGHT/4, WIDTH, -HEIGHT);
  82     cairo_stroke (cr);
  83     cairo_set_source_rgb (cr, 1., 1., 0);
  84     cairo_rectangle (cr, WIDTH+WIDTH/4, HEIGHT+HEIGHT/4, -WIDTH, -HEIGHT);
  85     cairo_stroke (cr);
  86
  87     return CAIRO_TEST_SUCCESS;
  88 }
  89
  90 int
  91 main (void)
  92 {
  93     return cairo_test (&test);
  94 }