1 /* babl - dynamically extendable universal pixel conversion library.
2 * Copyright (C) 2005, Øyvind Kolås.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 3 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General
15 * Public License along with this library; if not, see
16 * <https://www.gnu.org/licenses/>.
17 */
18
19 /* Verify that conversion of fully-transparent pixels preserves color
20 * information, when relevant for the source and destination formats.
21 * In particular, make sure that the conversion path doesn't pass
22 * through a format with premultiplied alpha. See bug #780016.
23 *
24 * Note that this test can, and will, result in false positives; i.e.,
25 * if the test passes, it means nothing -- we only watch for the
26 * occasional failure. Fun, right?
27 */
28
29 #include "config.h"
30 #include <stdlib.h>
31 #include <stdio.h>
32 #include <stdint.h>
33 #include "babl-internal.h"
34
35 #include "common.inc"
36
37
38 #define NUMBER_OF_TRIALS 50
39
40 static void
clear_fish_db(void)41 clear_fish_db (void)
42 {
43 /* so ugly... */
44 *babl_fish_db () = *babl_db_init ();
45 }
46
47 int
main(int argc,char ** argv)48 main (int argc,
49 char **argv)
50 {
51 int OK = 1;
52 int i;
53
54 babl_init ();
55
56 for (i = 0; OK && i < NUMBER_OF_TRIALS; i++)
57 {
58 clear_fish_db ();
59
60 {
61 uint16_t in [][4] = {{0xffff, 0xffff, 0xffff, 0}};
62 float out[][4] = {{1.0, 1.0, 1.0, 0.0}};
63
64 /* this conversion is known to have been problematic.
65 * see bug #780016.
66 */
67 CHECK_CONV_FLOAT ("u16' -> float", float, 0.001,
68 babl_format("R'G'B'A u16"),
69 babl_format("RGBA float"),
70 in, out);
71 }
72 }
73
74 /* be nice and don't overwrite the fish cache, since we cleared all the
75 * fishes.
76 */
77 /* babl_exit (); */
78
79 return !OK;
80 }
81