mirror of
https://gitlab.freedesktop.org/cairo/cairo.git
synced 2025-12-20 12:50:10 +01:00
316c1683ce
The calls to uniform_random() to get the curve points were in the function arguments, but argument order evaluation is compiler implementation dependent.
85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
/*
|
|
* 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"
|
|
|
|
#define SIZE 512
|
|
#define NUM_SEGMENTS 128
|
|
|
|
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;
|
|
|
|
cairo_set_source_rgb (cr, 0, 0, 0);
|
|
cairo_paint (cr);
|
|
|
|
state = 0x12345678;
|
|
cairo_translate (cr, 1, 1);
|
|
cairo_set_fill_rule (cr, CAIRO_FILL_RULE_WINDING);
|
|
|
|
cairo_move_to (cr, 0, 0);
|
|
for (i = 0; i < NUM_SEGMENTS; i++) {
|
|
double y3 = uniform_random (0, SIZE);
|
|
double x3 = uniform_random (0, SIZE);
|
|
double y2 = uniform_random (-SIZE, SIZE);
|
|
double x2 = uniform_random (-SIZE, SIZE);
|
|
double y1 = uniform_random (-SIZE, SIZE);
|
|
double x1 = uniform_random (-SIZE, SIZE);
|
|
cairo_curve_to (cr,
|
|
x1, y1,
|
|
x2, y2,
|
|
x3, y3);
|
|
}
|
|
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;
|
|
}
|
|
|
|
CAIRO_TEST (random_intersections_curves_nz,
|
|
"Tests the tessellator trapezoid generation and intersection computation",
|
|
"trap", /* keywords */
|
|
NULL, /* requirements */
|
|
SIZE+3, SIZE+3,
|
|
NULL, draw)
|
|
|