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Diffstat (limited to 'test/a1-rasterisation.c')
| -rw-r--r-- | test/a1-rasterisation.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/test/a1-rasterisation.c b/test/a1-rasterisation.c new file mode 100644 index 000000000..b59090ab5 --- /dev/null +++ b/test/a1-rasterisation.c @@ -0,0 +1,101 @@ +/* + * Copyright 2010 Intel Corporation + * + * 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. + * + * Author: Chris Wilson <chris@chris-wilson.co.uk> + */ + +#include "cairo-test.h" + +/* + * Test the fidelity of the rasterisation, paying careful attention to rounding. + */ + +#include "../src/cairo-fixed-type-private.h" +#define PRECISION (int)(1 << CAIRO_FIXED_FRAC_BITS) + +#define WIDTH ((PRECISION/2+1)*3) +#define HEIGHT ((PRECISION/2+1)*3) + +#define SUBPIXEL(v) ((v)/(double)(PRECISION/2)) + +static cairo_test_status_t +rectangles (cairo_t *cr, int width, int height) +{ + int x, y; + + cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); + cairo_paint (cr); + + cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); + cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE); + + for (x = 0; x < WIDTH; x += 3) { + for (y = 0; y < HEIGHT; y += 3) { + cairo_rectangle (cr, x + SUBPIXEL (y/3) - .5, y + SUBPIXEL (x/3) - .5, .5, .5); + } + } + cairo_fill (cr); + + return CAIRO_TEST_SUCCESS; +} + +static cairo_test_status_t +triangles (cairo_t *cr, int width, int height) +{ + int x, y; + + cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); + cairo_paint (cr); + + cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); + cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE); + + for (x = 0; x < WIDTH; x += 3) { + for (y = 0; y < HEIGHT; y += 3) { + /* a rectangle with a diagonal to force tessellation */ + cairo_move_to (cr, x + SUBPIXEL (y/3) - .5, y + SUBPIXEL (x/3) - .5); + cairo_rel_line_to (cr, .5, .5); + cairo_rel_line_to (cr, 0, -.5); + cairo_rel_line_to (cr, -.5, 0); + cairo_rel_line_to (cr, 0, .5); + cairo_rel_line_to (cr, .5, 0); + } + } + cairo_fill (cr); + + return CAIRO_TEST_SUCCESS; +} + +CAIRO_TEST (a1_rasterisation_rectangles, + "Check the fidelity of the rasterisation.", + "rasterisation", /* keywords */ + "target=raster", /* requirements */ + WIDTH, HEIGHT, + NULL, rectangles) + +CAIRO_TEST (a1_rasterisation_triangles, + "Check the fidelity of the rasterisation.", + "rasterisation", /* keywords */ + "target=raster", /* requirements */ + WIDTH, HEIGHT, + NULL, triangles) |