#include "cairo-perf.h"
#define NUM_SEGMENTS 256
static unsigned state;
static double
uniform_random (double minval, double maxval)
{
static unsigned const poly = 0x9a795537U;
unsigned n = 32;
while (n-->0)
state = 2*state < state ? (2*state ^ poly) : 2*state;
return minval + state * (maxval - minval) / 4294967296.0;
}
static cairo_perf_ticks_t
draw_random (cairo_t *cr, cairo_fill_rule_t fill_rule,
int width, int height, int loops)
{
double x[NUM_SEGMENTS];
double y[NUM_SEGMENTS];
int i;
cairo_save (cr);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_paint (cr);
for (i = 0; i < NUM_SEGMENTS; i++) {
x[i] = uniform_random (0, width);
y[i] = uniform_random (0, height);
}
state = 0x12345678;
cairo_translate (cr, 1, 1);
cairo_set_fill_rule (cr, fill_rule);
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_new_path (cr);
cairo_move_to (cr, 0, 0);
for (i = 0; i < NUM_SEGMENTS; i++)
cairo_line_to (cr, x[i], y[i]);
cairo_close_path (cr);
cairo_perf_timer_start ();
while (loops--)
cairo_fill_preserve (cr);
cairo_perf_timer_stop ();
cairo_restore (cr);
return cairo_perf_timer_elapsed ();
}
static cairo_perf_ticks_t
draw_random_curve (cairo_t *cr, cairo_fill_rule_t fill_rule,
int width, int height, int loops)
{
double x[3*NUM_SEGMENTS];
double y[3*NUM_SEGMENTS];
int i;
cairo_save (cr);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_paint (cr);
for (i = 0; i < 3*NUM_SEGMENTS; i++) {
x[i] = uniform_random (0, width);
y[i] = uniform_random (0, height);
}
state = 0x12345678;
cairo_translate (cr, 1, 1);
cairo_set_fill_rule (cr, fill_rule);
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_new_path (cr);
cairo_move_to (cr, 0, 0);
for (i = 0; i < NUM_SEGMENTS; i++) {
cairo_curve_to (cr,
x[3*i+0], y[3*i+0],
x[3*i+1], y[3*i+1],
x[3*i+2], y[3*i+2]);
}
cairo_close_path (cr);
cairo_perf_timer_start ();
while (loops--)
cairo_fill_preserve (cr);
cairo_perf_timer_stop ();
cairo_restore (cr);
return cairo_perf_timer_elapsed ();
}
static cairo_perf_ticks_t
random_eo (cairo_t *cr, int width, int height, int loops)
{
return draw_random (cr, CAIRO_FILL_RULE_EVEN_ODD, width, height, loops);
}
static cairo_perf_ticks_t
random_nz (cairo_t *cr, int width, int height, int loops)
{
return draw_random (cr, CAIRO_FILL_RULE_WINDING, width, height, loops);
}
static cairo_perf_ticks_t
random_curve_eo (cairo_t *cr, int width, int height, int loops)
{
return draw_random_curve (cr, CAIRO_FILL_RULE_EVEN_ODD, width, height, loops);
}
static cairo_perf_ticks_t
random_curve_nz (cairo_t *cr, int width, int height, int loops)
{
return draw_random_curve (cr, CAIRO_FILL_RULE_WINDING, width, height, loops);
}
void
intersections (cairo_perf_t *perf, cairo_t *cr, int width, int height)
{
if (! cairo_perf_can_run (perf, "intersections", NULL))
return;
cairo_perf_run (perf, "intersections-nz-fill", random_nz, NULL);
cairo_perf_run (perf, "intersections-eo-fill", random_eo, NULL);
cairo_perf_run (perf, "intersections-nz-curve-fill", random_curve_nz, NULL);
cairo_perf_run (perf, "intersections-eo-curve-fill", random_curve_eo, NULL);
}