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author | Carl Worth <cworth@cworth.org> | 2006-08-18 06:15:02 -0700 |
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committer | Carl Worth <cworth@cworth.org> | 2006-08-18 06:32:11 -0700 |
commit | 200a2d811efab2e48d6b584b9da202effaddf99f (patch) | |
tree | fe356cb4203ee1fc6b2dda6c504d1d4538c7dbc7 /test/close-path.c | |
parent | 8330f4dbd123da57850756a194ba9f7558e6f9cc (diff) | |
download | cairo-200a2d811efab2e48d6b584b9da202effaddf99f.tar.gz |
close-path: New test case to demonstrate corner case discovered by Tim Rowley
The bug shows up when doing cairo_copy_path_flat for a path that has
a curve_to immediately after a close_path. When the curve is flattened
the flattener is using (0,0) as the initial point rather than the proper
close_to point.
This test also serves to ensure a similar bug doesn't crop up when
closing a path that begins with an implicit move_to, (as from cairo_arc).
In that bug the path state may have no last-move-point and the path
is closed to (0,0). This bug is not present currently, but did appear
during the development of a fix for the bug above.
Diffstat (limited to 'test/close-path.c')
-rw-r--r-- | test/close-path.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/test/close-path.c b/test/close-path.c new file mode 100644 index 000000000..04658b2a2 --- /dev/null +++ b/test/close-path.c @@ -0,0 +1,84 @@ +/* + * Copyright © 2006 Red Hat, Inc. + * + * Permission to use, copy, modify, distribute, and sell this software + * and its documentation for any purpose is hereby granted without + * fee, provided that the above copyright notice appear in all copies + * and that both that copyright notice and this permission notice + * appear in supporting documentation, and that the name of + * Red Hat, Inc. not be used in advertising or publicity pertaining to + * distribution of the software without specific, written prior + * permission. Red Hat, Inc. makes no representations about the + * suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS + * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL, + * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER + * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION + * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR + * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * Author: Carl D. Worth <cworth@cworth.org> + */ + +#include <stdlib.h> +#include "cairo-test.h" + +static cairo_test_draw_function_t draw; + +cairo_test_t test = { + "close-path", + "Test some corner cases related to cairo_close_path", + 32, 16, + draw +}; + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + cairo_path_t *path; + + /* We draw in the default black, so paint white first. */ + cairo_save (cr); + cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */ + cairo_paint (cr); + cairo_restore (cr); + + /* This curious approach for drawing a circle (starting with a + * closed arc) exercises a bug in which the "last move point" was + * not being set so the close_path closes to (0,0). */ + cairo_arc (cr, 8, 8, 4, 0, M_PI); + cairo_close_path (cr); + cairo_arc (cr, 8, 8, 4, M_PI, 2 * M_PI); + + cairo_fill (cr); + + cairo_translate (cr, 16, 0); + + /* Here a curve immediately after a close_to will begin from (0,0) + * when the path is obtained with cairo_copy_path_flat. */ + cairo_move_to (cr, 8, 4); + cairo_arc_negative (cr, 8, 8, 4, 3 * M_PI / 2.0, M_PI / 2.0); + cairo_close_path (cr); + cairo_curve_to (cr, + 12, 4, + 12, 12, + 8, 12); + + path = cairo_copy_path_flat (cr); + cairo_new_path (cr); + cairo_append_path (cr, path); + cairo_path_destroy (path); + + cairo_fill (cr); + + return CAIRO_TEST_SUCCESS; +} + +int +main (void) +{ + return cairo_test (&test); +} |