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core: implement color manipulation, closes #2446
author David Demelier <markand@malikania.fr>
date Tue, 07 Jan 2020 20:41:11 +0100
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children 8f6a1ffb1ebe
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10:c91c3272101b 11:d1cdb90d9558
1 /*
2 * color.h -- basic color routines
3 *
4 * Copyright (c) 2020 David Demelier <markand@malikania.fr>
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #ifndef MOLKO_COLOR_H
20 #define MOLKO_COLOR_H
21
22 /**
23 * \file color.h
24 * \brief Basic color routines.
25 */
26
27 /**
28 * Get red component of hexadecimal color.
29 *
30 * \param c the hexadecimal color
31 * \return the red component
32 */
33 #define COLOR_R(c) (c >> 24 & 0xff)
34
35 /**
36 * Get green component of hexadecimal color.
37 *
38 * \param c the hexadecimal color
39 * \return the green component
40 */
41 #define COLOR_G(c) (c >> 16 & 0xff)
42
43 /**
44 * Get blue component of hexadecimal color.
45 *
46 * \param c the hexadecimal color
47 * \return the blue component
48 */
49 #define COLOR_B(c) (c >> 8 & 0xff)
50
51 /**
52 * Get alpha component of hexadecimal color.
53 *
54 * \param c the hexadecimal color
55 * \return the alpha component
56 */
57 #define COLOR_A(c) (c & 0xff)
58
59 /**
60 * Convert individual RGBA components into a hexadecimal color.
61 *
62 * \param r the red component
63 * \param g the green component
64 * \param b the blue component
65 * \param a the alpha component
66 * \return the hexadecimal color
67 */
68 #define COLOR_HEX(r, g, b, a) \
69 (r << 24 & 0xff000000 | \
70 g << 16 & 0x00ff0000 | \
71 b << 8 & 0x0000ff00 | \
72 a & 0x000000ff)
73
74 #endif /* !MOLKO_COLOR_H */