radial-gradient-mask.c [plain text]
#include "cairo-test.h"
#define NUM_GRADIENTS 4
#define NUM_EXTEND 4
#define SIZE 60
#define WIDTH (SIZE * NUM_GRADIENTS * NUM_GRADIENTS)
#define HEIGHT (SIZE * NUM_EXTEND)
static void
draw_gradient (cairo_t *cr,
int x,
int y,
int size,
double r1_offset,
double r1_radius,
double r2_offset,
double r2_radius,
cairo_extend_t extend)
{
cairo_pattern_t *pattern;
cairo_save (cr);
pattern = cairo_pattern_create_radial (x + size/2.0 + r1_offset,
y + size/2.0 + r1_offset,
r1_radius,
x + size/2.0 + r2_offset,
y + size/2.0 + r2_offset,
r2_radius);
cairo_pattern_add_color_stop_rgba (pattern, 0.0,
1.0, 0.0, 0.0, 1.0);
cairo_pattern_add_color_stop_rgba (pattern, sqrt (1.0 / 2.0),
0.0, 1.0, 0.0, 0.0);
cairo_pattern_add_color_stop_rgba (pattern, 1.0,
0.0, 0.0, 1.0, 0.5);
cairo_pattern_set_extend (pattern, extend);
cairo_rectangle (cr, x, y, size, size);
cairo_clip (cr);
cairo_set_source_rgb (cr, 1, 0, 1);
cairo_mask (cr, pattern);
cairo_pattern_destroy (pattern);
cairo_restore (cr);
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
int i, j, k;
cairo_extend_t extend[NUM_EXTEND] = {
CAIRO_EXTEND_NONE,
CAIRO_EXTEND_REPEAT,
CAIRO_EXTEND_REFLECT,
CAIRO_EXTEND_PAD
};
for (j = 0; j < NUM_EXTEND; j++) {
for (i = 0; i < NUM_GRADIENTS; i++) {
double r1_offset = i % 2 ? SIZE / 12.0 : 0.0;
double r1_radius = i >= NUM_GRADIENTS / 2 ? SIZE / 6.0 : 0.0;
for (k = 0; k < NUM_GRADIENTS; k++) {
double r2_offset = k % 2 ? SIZE / 12.0 : 0.0;
double r2_radius = k >= NUM_GRADIENTS / 2 ? SIZE / 3.0 : SIZE / 12.;
draw_gradient (cr,
i * SIZE * NUM_GRADIENTS + k * SIZE, j * SIZE, SIZE,
r1_offset, r1_radius,
r2_offset, r2_radius,
extend[j]);
}
}
}
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (radial_gradient_mask,
"Simple test of radial gradients using a MASK",
"gradient,mask",
NULL,
WIDTH, HEIGHT,
NULL, draw)