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/*
* Copyright © 2006 M Joonas Pihlaja
* Copyright © 2011 Chris Wilson
*
* 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.
*
* Authors:
* M Joonas Pihlaja <jpihlaja@cc.helsinki.fi>
* Chris Wilson <chris@chris-wilson.co.uk>
*/
#include "cairo-test.h"
#define SIZE 512
#define STEP (512+2)
#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 void nz_path (cairo_t *cr)
{
int i;
state = 0xc0ffee;
cairo_move_to (cr, 0, 0);
for (i = 0; i < NUM_SEGMENTS; i++) {
double x = uniform_random (0, SIZE);
double y = uniform_random (0, SIZE);
cairo_line_to (cr, x, y);
}
cairo_close_path (cr);
}
static void region_path (cairo_t *cr)
{
int i;
state = 0xc0ffee;
for (i = 0; i < NUM_SEGMENTS; i++) {
int x = uniform_random (0, SIZE);
int y = uniform_random (0, SIZE);
int w = uniform_random (0, 40);
int h = uniform_random (0, 40);
cairo_rectangle (cr, x, y, w, h);
}
}
static void rectangle_path (cairo_t *cr)
{
int i;
state = 0xc0ffee;
for (i = 0; i < NUM_SEGMENTS; i++) {
double x = uniform_random (0, SIZE);
double y = uniform_random (0, SIZE);
double w = uniform_random (0, 40);
double h = uniform_random (0, 40);
cairo_rectangle (cr, x, y, w, h);
}
}
static void arc_path (cairo_t *cr)
{
int i;
state = 0xc0ffee;
for (i = 0; i < NUM_SEGMENTS; i++) {
double x = uniform_random (0, SIZE);
double y = uniform_random (0, SIZE);
double r = uniform_random (0, 20);
cairo_new_sub_path (cr);
cairo_arc (cr, x, y, r, 0, 2*M_PI);
}
}
static void nz_fill_stroke (cairo_t *cr)
{
nz_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, 1.0);
cairo_stroke (cr);
}
static void clip_to_quadrant (cairo_t *cr)
{
cairo_rectangle (cr, 0, 0, SIZE, SIZE);
cairo_clip (cr);
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_paint (cr);
cairo_set_fill_rule (cr, CAIRO_FILL_RULE_WINDING);
state = 0xc0ffee;
cairo_translate (cr, 1, 1);
/* no clipping */
cairo_save (cr); {
clip_to_quadrant (cr);
nz_fill_stroke (cr);
} cairo_restore (cr);
cairo_translate (cr, STEP, 0);
/* random clipping */
cairo_save (cr); {
clip_to_quadrant (cr);
nz_path (cr);
cairo_clip (cr);
nz_fill_stroke (cr);
cairo_set_source_rgba (cr, 1, 1, 1, 0.5);
cairo_paint (cr);
} cairo_restore (cr);
cairo_translate (cr, STEP, 0);
/* regional clipping */
cairo_save (cr); {
clip_to_quadrant (cr);
region_path (cr);
cairo_clip (cr);
nz_fill_stroke (cr);
cairo_set_source_rgba (cr, 1, 1, 1, 0.5);
cairo_paint (cr);
} cairo_restore (cr);
cairo_translate (cr, -2*STEP, STEP);
/* rectangular clipping */
cairo_save (cr); {
clip_to_quadrant (cr);
rectangle_path (cr);
cairo_clip (cr);
nz_fill_stroke (cr);
cairo_set_source_rgba (cr, 1, 1, 1, 0.5);
cairo_paint (cr);
} cairo_restore (cr);
cairo_translate (cr, STEP, 0);
/* circular clipping */
cairo_save (cr); {
clip_to_quadrant (cr);
arc_path (cr);
cairo_clip (cr);
nz_fill_stroke (cr);
cairo_set_source_rgba (cr, 1, 1, 1, 0.5);
cairo_paint (cr);
} cairo_restore (cr);
cairo_translate (cr, STEP, 0);
/* all-of-the-above clipping */
cairo_save (cr); {
clip_to_quadrant (cr);
nz_path (cr);
cairo_clip (cr);
region_path (cr);
cairo_clip (cr);
rectangle_path (cr);
cairo_clip (cr);
arc_path (cr);
cairo_clip (cr);
nz_fill_stroke (cr);
cairo_set_source_rgba (cr, 1, 1, 1, 0.5);
cairo_paint (cr);
} cairo_restore (cr);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (random_clip,
"Tests the clip generation and intersection computation",
"trap, clip", /* keywords */
NULL, /* requirements */
3*STEP+2, 2*STEP+2,
NULL, draw)