diff options
author | sanine <sanine.not@pm.me> | 2022-10-12 12:03:23 -0500 |
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committer | sanine <sanine.not@pm.me> | 2022-10-12 12:03:23 -0500 |
commit | 530ffd0b7d3c39757b20f00716e486b5caf89aff (patch) | |
tree | 76b35fdf57317038acf6b828871f6ae25fce2ebe /libs/cairo-1.16.0/test/mask-alpha.c | |
parent | 3dbe9332e47c143a237db12440f134caebd1cfbe (diff) |
add cairo
Diffstat (limited to 'libs/cairo-1.16.0/test/mask-alpha.c')
-rw-r--r-- | libs/cairo-1.16.0/test/mask-alpha.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/mask-alpha.c b/libs/cairo-1.16.0/test/mask-alpha.c new file mode 100644 index 0000000..d66e0ac --- /dev/null +++ b/libs/cairo-1.16.0/test/mask-alpha.c @@ -0,0 +1,82 @@ +/* + * Copyright © 2007 Adrian Johnson + * + * 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: Adrian Johnson <ajohnson@redneon.com> + */ + +#include "cairo-test.h" + +#define SIZE 40 +#define PAD 2 +#define WIDTH (PAD + SIZE + PAD) +#define HEIGHT WIDTH + +/* This test is designed to test that PDF viewers use the correct + * alpha values in an Alpha SMasks. Some viewers use the color values + * instead of the alpha. The test draws a triangle and rectangle in a + * group then draws the group using cairo_mask(). The mask consists of + * a circle with the rgba (0.4, 0.4, 0.4, 0.8) and the background rgba + * (0.8, 0.8, 0.8, 0.4). + */ + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + cairo_pattern_t *pattern; + + cairo_translate (cr, PAD, PAD); + + /* mask */ + cairo_push_group (cr); + cairo_set_source_rgba (cr, 0.8, 0.8, 0.8, 0.4); + cairo_paint (cr); + cairo_arc (cr, SIZE / 2, SIZE / 2, SIZE / 6, 0., 2. * M_PI); + cairo_set_source_rgba (cr, 0.4, 0.4, 0.4, 0.8); + cairo_fill (cr); + pattern = cairo_pop_group (cr); + + /* source */ + cairo_push_group (cr); + cairo_rectangle (cr, 0.3 * SIZE, 0.2 * SIZE, 0.5 * SIZE, 0.5 * SIZE); + cairo_set_source_rgb (cr, 0, 0, 1); + cairo_fill (cr); + cairo_move_to (cr, 0.0, 0.8 * SIZE); + cairo_rel_line_to (cr, 0.7 * SIZE, 0.0); + cairo_rel_line_to (cr, -0.375 * SIZE, -0.6 * SIZE); + cairo_close_path (cr); + cairo_set_source_rgb (cr, 0, 1, 0); + cairo_fill (cr); + cairo_pop_group_to_source (cr); + + cairo_mask (cr, pattern); + cairo_pattern_destroy (pattern); + + return CAIRO_TEST_SUCCESS; +} + +CAIRO_TEST (mask_alpha, + "A simple test painting a group through a circle mask", + "mask, alpha", /* keywords */ + NULL, /* requirements */ + WIDTH, HEIGHT, + NULL, draw) |