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author | Carl Worth <cworth@cworth.org> | 2008-01-21 16:32:48 -0800 |
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committer | Carl Worth <cworth@cworth.org> | 2008-01-21 16:32:48 -0800 |
commit | 32efcc94627e8890969c4b36a78c831ced6f8d62 (patch) | |
tree | 97c66e4e0c4a6ddb75624490b1e45223a030e65a /test/rectilinear-miter-limit.c | |
parent | 326342962daa694d876c03194e8a6c1b13f9a8d2 (diff) | |
download | cairo-32efcc94627e8890969c4b36a78c831ced6f8d62.tar.gz |
Add new rectilinear-miter-limit test to demonstrate bug
We're failing to respect the miter limit in the rectilinear
stroke optimization code.
Diffstat (limited to 'test/rectilinear-miter-limit.c')
-rw-r--r-- | test/rectilinear-miter-limit.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/test/rectilinear-miter-limit.c b/test/rectilinear-miter-limit.c new file mode 100644 index 000000000..78d05120f --- /dev/null +++ b/test/rectilinear-miter-limit.c @@ -0,0 +1,80 @@ +/* + * Copyright © 2009 Red Hat, Inc. + * + * 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: Carl D. Worth <cworth@cworth.org> + */ + +#include "cairo-test.h" + +#define LINE_WIDTH 10 +#define PAD 2 +#define WIDTH (PAD + LINE_WIDTH + PAD) +#define HEIGHT (WIDTH) + +static cairo_test_draw_function_t draw; + +cairo_test_t test = { + "rectilinear-miter-limit", + "Test that the rectilinear stroke optimization doesn't break cairo_set_miter_limit", + WIDTH, HEIGHT, + draw +}; + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + cairo_translate (cr, PAD, PAD); + + /* Paint background white, then draw in black. */ + cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */ + cairo_paint (cr); + cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); /* black */ + + cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT); + cairo_set_line_width (cr, LINE_WIDTH); + + /* The default miter limit value of 10.0 guarantees that + * right-angle turns, (in fact, any angle greater than 11 + * degrees), gets a miter rather than a bevel join. The + * rectilinear stroke optimization was originally written in a + * buggy way that did not respect the miter limit, (that is, + * inappropriately drawing miter joins when the miter limit would + * turn them into bevels). So we draw here with a miter limit of + * 1.0 to force all miter joins into bevels. */ + cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER); + cairo_set_miter_limit (cr, 1.0); + + cairo_move_to (cr, LINE_WIDTH / 2.0, LINE_WIDTH); + cairo_rel_line_to (cr, 0, - LINE_WIDTH / 2.0); + cairo_rel_line_to (cr, LINE_WIDTH / 2.0, 0); + + cairo_stroke (cr); + + return CAIRO_TEST_SUCCESS; +} + +int +main (void) +{ + return cairo_test (&test); +} |