diff options
Diffstat (limited to 'libs/cairo-1.16.0/test/fill-missed-stop.c')
| -rw-r--r-- | libs/cairo-1.16.0/test/fill-missed-stop.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/fill-missed-stop.c b/libs/cairo-1.16.0/test/fill-missed-stop.c new file mode 100644 index 0000000..5589337 --- /dev/null +++ b/libs/cairo-1.16.0/test/fill-missed-stop.c @@ -0,0 +1,83 @@ +/* + * Copyright © 2006 M Joonas Pihlaja + * + * 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: M Joonas Pihlaja <jpihlaja@cc.helsinki.fi> + */ + +/* Bug history + * + * 2006-12-05 M Joonas Pihlaja <jpihlaja@cc.helsinki.fi> + * + * The tessellator has a regression where a trapezoid may continue + * below the end of a polygon edge (i.e. the bottom of the trapezoid + * is miscomputed.) This can only happen if the right edge of a + * trapezoid stops earlier than the left edge and there is no start + * event at the end point of the right edge. + */ + +#include "cairo-test.h" + +#define SIZE 50 + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + cairo_set_source_rgb (cr, 1, 0, 0); + + cairo_translate (cr, 1, 1); + + /* What it should look like, with # marking the filled areas: + * + * |\ |\ + * |#\ |#\ + * |##\__|##\ + * \#| + * \| + * + * What it looke like with the bug, when the rightmost edge's end + * is missed: + * + * |\ |\ + * |#\ |#\ + * |##\__|##\ + * \#####| + * \####| + */ + + cairo_move_to (cr, 0, 0); + cairo_line_to (cr, SIZE/2, SIZE); + cairo_line_to (cr, SIZE/2, 0); + cairo_line_to (cr, SIZE, SIZE/2); + cairo_line_to (cr, 0, SIZE/2); + cairo_close_path (cr); + cairo_fill (cr); + + return CAIRO_TEST_SUCCESS; +} + +CAIRO_TEST (fill_missed_stop, + "Tests that the tessellator doesn't miss stop events when generating trapezoids", + "fill", /* keywords */ + NULL, /* requirements */ + SIZE+3, SIZE+3, + NULL, draw) |