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24 * Author: Chris Wilson <chris@chris-wilson.co.uk>
27 #include "cairo-test.h"
29 /* A fun little test to explore color fringing in various experimental
30 * subpixel rasterisation techniques.
36 static const struct color {
37 double red, green, blue;
50 #define NUM_COLORS ARRAY_LENGTH (color)
53 object (cairo_t *cr, const struct color *fg, const struct color *bg)
55 cairo_set_source_rgb (cr, bg->red, bg->green, bg->blue);
56 cairo_rectangle (cr, 0, 0, WIDTH, HEIGHT);
59 cairo_set_source_rgb (cr, fg->red, fg->green, fg->blue);
61 cairo_scale (cr, WIDTH, HEIGHT);
62 cairo_arc (cr, .5, .5, .5 - 4. / MAX (WIDTH, HEIGHT), 0, 2 * M_PI);
64 cairo_arc (cr, .5, .5, .5 - 2. / MAX (WIDTH, HEIGHT), 0, 2 * M_PI);
66 cairo_set_line_width (cr, 1.);
69 cairo_set_source_rgb (cr, bg->red, bg->green, bg->blue);
70 cairo_set_line_width (cr, 4.);
71 cairo_move_to (cr, 4, HEIGHT-4);
72 cairo_line_to (cr, WIDTH-12, 4);
73 cairo_move_to (cr, 12, HEIGHT-4);
74 cairo_line_to (cr, WIDTH-4, 4);
78 static cairo_test_status_t
79 draw (cairo_t *cr, int width, int height)
83 for (i = 0; i < NUM_COLORS; i++) {
84 for (j = 0; j < NUM_COLORS; j++) {
86 cairo_translate (cr, i * WIDTH, j * HEIGHT);
87 object (cr, &color[i], &color[j]);
92 return CAIRO_TEST_SUCCESS;
96 "Check for subpixel aliasing and color fringing",
97 "rasterisation", /* keywords */
98 "target=raster", /* requirements */
99 NUM_COLORS * WIDTH, NUM_COLORS * HEIGHT,