diff options
author | sanine <sanine.not@pm.me> | 2022-10-12 12:03:23 -0500 |
---|---|---|
committer | sanine <sanine.not@pm.me> | 2022-10-12 12:03:23 -0500 |
commit | 530ffd0b7d3c39757b20f00716e486b5caf89aff (patch) | |
tree | 76b35fdf57317038acf6b828871f6ae25fce2ebe /libs/cairo-1.16.0/test/aliasing.c | |
parent | 3dbe9332e47c143a237db12440f134caebd1cfbe (diff) |
add cairo
Diffstat (limited to 'libs/cairo-1.16.0/test/aliasing.c')
-rw-r--r-- | libs/cairo-1.16.0/test/aliasing.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/aliasing.c b/libs/cairo-1.16.0/test/aliasing.c new file mode 100644 index 0000000..73c1f1a --- /dev/null +++ b/libs/cairo-1.16.0/test/aliasing.c @@ -0,0 +1,100 @@ +/* + * 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" + +/* A fun little test to explore color fringing in various experimental + * subpixel rasterisation techniques. + */ + +#define WIDTH 60 +#define HEIGHT 40 + +static const struct color { + double red, green, blue; +} color[] = { + { 1, 1, 1 }, + { 0, 0, 0 }, + { 1, 0, 0 }, + { 0, 1, 0 }, + { 0, 0, 1 }, + { 1, 1, 0 }, + { 0, 1, 1 }, + { 1, 0, 1 }, + { .5, .5, .5 }, +}; + +#define NUM_COLORS ARRAY_LENGTH (color) + +static void +object (cairo_t *cr, const struct color *fg, const struct color *bg) +{ + cairo_set_source_rgb (cr, bg->red, bg->green, bg->blue); + cairo_rectangle (cr, 0, 0, WIDTH, HEIGHT); + cairo_fill (cr); + + cairo_set_source_rgb (cr, fg->red, fg->green, fg->blue); + cairo_save (cr); + cairo_scale (cr, WIDTH, HEIGHT); + cairo_arc (cr, .5, .5, .5 - 4. / MAX (WIDTH, HEIGHT), 0, 2 * M_PI); + cairo_fill (cr); + cairo_arc (cr, .5, .5, .5 - 2. / MAX (WIDTH, HEIGHT), 0, 2 * M_PI); + cairo_restore (cr); + cairo_set_line_width (cr, 1.); + cairo_stroke (cr); + + cairo_set_source_rgb (cr, bg->red, bg->green, bg->blue); + cairo_set_line_width (cr, 4.); + cairo_move_to (cr, 4, HEIGHT-4); + cairo_line_to (cr, WIDTH-12, 4); + cairo_move_to (cr, 12, HEIGHT-4); + cairo_line_to (cr, WIDTH-4, 4); + cairo_stroke (cr); +} + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + unsigned int i, j; + + for (i = 0; i < NUM_COLORS; i++) { + for (j = 0; j < NUM_COLORS; j++) { + cairo_save (cr); + cairo_translate (cr, i * WIDTH, j * HEIGHT); + object (cr, &color[i], &color[j]); + cairo_restore (cr); + } + } + + return CAIRO_TEST_SUCCESS; +} + +CAIRO_TEST (aliasing, + "Check for subpixel aliasing and color fringing", + "rasterisation", /* keywords */ + "target=raster", /* requirements */ + NUM_COLORS * WIDTH, NUM_COLORS * HEIGHT, + NULL, draw) |