aboutsummaryrefslogtreecommitdiffstats
path: root/servers-gamma.h
blob: e522cf5431e89dc430c53c354c6cf1967eee496e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
/* See LICENSE file for copyright and license details. */
#ifndef SERVERS_GAMMA_H
#define SERVERS_GAMMA_H

#include "types-output.h"

#include <stddef.h>

#ifndef GCC_ONLY
# if defined(__GNUC__) && !defined(__clang__)
#  define GCC_ONLY(...) __VA_ARGS__
# else
#  define GCC_ONLY(...) /* nothing */
# endif
#endif

/**
 * Handle a ‘Command: set-gamma’ message
 * 
 * @param   conn        The index of the connection
 * @param   message_id  The value of the ‘Message ID’ header
 * @param   crtc        The value of the ‘CRTC’ header
 * @return              Zero on success (even if ignored), -1 on error,
 *                      1 if connection closed
 */
GCC_ONLY(__attribute__((__nonnull__(2))))
int handle_get_gamma_info(size_t conn, const char *restrict message_id, const char *restrict crtc);

/**
 * Set the gamma ramps on an output
 * 
 * @param  output  The output
 * @param  ramps   The gamma ramps
 */
GCC_ONLY(__attribute__((__nonnull__)))
void set_gamma(const struct output *restrict output, const union gamma_ramps *restrict ramps);

/**
 * Store all current gamma ramps
 * 
 * @return  Zero on success, -1 on error
 */
int initialise_gamma_info(void);

/**
 * Store all current gamma ramps
 */
void store_gamma(void);

/**
 * Restore all gamma ramps
 */
void restore_gamma(void);

/**
 * Reapplu all gamma ramps
 */
void reapply_gamma(void);

#endif