diff options
| author | M Joonas Pihlaja <jpihlaja@cc.helsinki.fi> | 2006-12-07 04:46:07 +0200 |
|---|---|---|
| committer | M Joonas Pihlaja <jpihlaja@cc.helsinki.fi> | 2006-12-07 04:46:07 +0200 |
| commit | fd03991a6a78d849e2184f53a2b1b6915a6a64d0 (patch) | |
| tree | c8926e9c9212f3181dc34b7dea3c4e9d8a328931 /test/random-intersections.c | |
| parent | 6301f92d2af2fd7928352965bcab42bab9deb59d (diff) | |
test: random-intersections
The purpose of this test case is to help make
sure that changes to the trapezoid generation or
intersection computation in the tessellator
don't break it.
Diffstat (limited to 'test/random-intersections.c')
| -rw-r--r-- | test/random-intersections.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/test/random-intersections.c b/test/random-intersections.c new file mode 100644 index 00000000..0f1c2d2e --- /dev/null +++ b/test/random-intersections.c @@ -0,0 +1,79 @@ +/* + * 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> + */ +#include "cairo-test.h" + +static cairo_test_draw_function_t draw; +#define SIZE 512 +#define NUM_SEGMENTS 128 + +cairo_test_t test = { + "random-intersections", + "Tests the tessellator trapezoid generation and intersection computation", + SIZE+3, SIZE+3, + draw +}; + +static uint32_t state; +static double +uniform_random (double minval, double maxval) +{ + static uint32_t const poly = 0x9a795537U; + uint32_t n = 32; + while (n-->0) + state = 2*state < state ? (2*state ^ poly) : 2*state; + return minval + state * (maxval - minval) / 4294967296.0; +} + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + int i; + state = 0x12345678; + cairo_translate (cr, 1, 1); + cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD); + + cairo_move_to (cr, 0, 0); + for (i = 0; i < NUM_SEGMENTS; i++) { + double x = uniform_random (0, width); + double y = uniform_random (0, height); + cairo_line_to (cr, x, y); + } + cairo_close_path (cr); + + cairo_set_source_rgb (cr, 1, 0, 0); + cairo_fill_preserve (cr); + cairo_set_source_rgb (cr, 0, 1, 0); + cairo_set_line_width (cr, 0.5); + cairo_stroke (cr); + + return CAIRO_TEST_SUCCESS; +} + +int +main (void) +{ + return cairo_test (&test); +} |