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24 * Author: Chris Wilson <chris@chris-wilson.co.uk>
27 #include "cairo-test.h"
30 * Test the fidelity of the rasterisation, paying careful attention to rounding.
33 #include "../src/cairo-fixed-type-private.h"
34 #define PRECISION (int)(1 << CAIRO_FIXED_FRAC_BITS)
36 #define WIDTH ((PRECISION/2+1)*3)
37 #define HEIGHT ((PRECISION/2+1)*3)
39 #define SUBPIXEL(v) ((v)/(double)(PRECISION/2))
41 static cairo_test_status_t
42 rectangles (cairo_t *cr, int width, int height)
46 cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
49 cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
50 cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
52 for (x = 0; x < WIDTH; x += 3) {
53 for (y = 0; y < HEIGHT; y += 3) {
54 cairo_rectangle (cr, x + SUBPIXEL (y/3) - .5, y + SUBPIXEL (x/3) - .5, .5, .5);
59 return CAIRO_TEST_SUCCESS;
62 static cairo_test_status_t
63 triangles (cairo_t *cr, int width, int height)
67 cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
70 cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
71 cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
73 for (x = 0; x < WIDTH; x += 3) {
74 for (y = 0; y < HEIGHT; y += 3) {
75 /* a rectangle with a diagonal to force tessellation */
76 cairo_move_to (cr, x + SUBPIXEL (y/3) - .5, y + SUBPIXEL (x/3) - .5);
77 cairo_rel_line_to (cr, .5, .5);
78 cairo_rel_line_to (cr, 0, -.5);
79 cairo_rel_line_to (cr, -.5, 0);
80 cairo_rel_line_to (cr, 0, .5);
81 cairo_rel_line_to (cr, .5, 0);
86 return CAIRO_TEST_SUCCESS;
89 CAIRO_TEST (a1_rasterisation_rectangles,
90 "Check the fidelity of the rasterisation.",
91 "rasterisation", /* keywords */
92 "target=raster", /* requirements */
96 CAIRO_TEST (a1_rasterisation_triangles,
97 "Check the fidelity of the rasterisation.",
98 "rasterisation", /* keywords */
99 "target=raster", /* requirements */