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
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/**
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>
#include <xcb/xcb.h>
#include <xcb/randr.h>
/**
* The major version of RANDR the program expects
*/
#define RANDR_VERSION_MAJOR 1U
/**
* The minor version of RANDR the program expects
*/
#define RANDR_VERSION_MINOR 3U
int main(int argc __attribute__((unused)), char** argv __attribute__((unused)))
{
uint64_t use_crtcs = ~0;
xcb_connection_t* connection;
xcb_generic_error_t* error;
xcb_randr_query_version_cookie_t version_cookie;
xcb_randr_query_version_reply_t* randr_version;
const xcb_setup_t* setup;
xcb_screen_iterator_t iter;
xcb_screen_t* screen;
xcb_randr_get_screen_resources_current_cookie_t res_cookie;
xcb_randr_get_screen_resources_current_reply_t* res_reply;
unsigned int crtc_count;
xcb_randr_crtc_t* crtcs;
xcb_randr_crtc_t* crtcs_end;
xcb_randr_get_crtc_gamma_size_cookie_t gamma_size_cookie;
xcb_randr_get_crtc_gamma_size_reply_t* gamma_size_reply;
unsigned int curve_size;
xcb_randr_get_crtc_gamma_cookie_t gamma_get_cookie;
xcb_randr_get_crtc_gamma_reply_t* gamma_get_reply;
uint16_t* r_gamma;
uint16_t* g_gamma;
uint16_t* b_gamma;
unsigned int i;
xcb_void_cookie_t gamma_set_cookie;
/* Get X connection */
connection = xcb_connect(NULL, NULL /* preferred screen */);
/* Check RANDR protocol version */
version_cookie = xcb_randr_query_version(connection, RANDR_VERSION_MAJOR, RANDR_VERSION_MINOR);
randr_version = xcb_randr_query_version_reply(connection, version_cookie, &error);
if (error || (randr_version == NULL))
{
fprintf(stderr, "RANDR version query returned %i", error ? error->error_code : -1);
xcb_disconnect(connection);
return 1;
}
if (randr_version->major_version != RANDR_VERSION_MAJOR || randr_version->minor_version < RANDR_VERSION_MINOR)
{
fprintf(stderr, "Unsupported RANDR version, got %u.%u, expected %u.%u\n",
randr_version->major_version, randr_version->minor_version,
RANDR_VERSION_MAJOR, RANDR_VERSION_MINOR);
free(randr_version);
xcb_disconnect(connection);
return 1;
}
free(randr_version);
/* Get X resources */
setup = xcb_get_setup(connection);
iter = xcb_setup_roots_iterator(setup);
screen = iter.data;
res_cookie = xcb_randr_get_screen_resources_current(connection, screen->root);
res_reply = xcb_randr_get_screen_resources_current_reply(connection, res_cookie, &error);
if (error)
{
fprintf(stderr, "RANDR screen resource query returned %i\n", error->error_code);
xcb_disconnect(connection);
return 1;
}
/* Get CRTC:s */
crtc_count = res_reply->num_crtcs;
crtcs = xcb_randr_get_screen_resources_current_crtcs(res_reply);
crtcs_end = crtcs + crtc_count;
/* Use CRTC:s */
while (crtcs != crtcs_end)
{
/* Check whether we should use the CRTC */
if ((use_crtcs & 1) == 0)
goto next_crtc;
/* Get curve X-axis size */
gamma_size_cookie = xcb_randr_get_crtc_gamma_size(connection, *crtcs);
gamma_size_reply = xcb_randr_get_crtc_gamma_size_reply(connection, gamma_size_cookie, &error);
if (error)
{
fprintf(stderr, "RANDR CRTC gamma size query returned %i\n", error->error_code);
xcb_disconnect(connection);
return 1;
}
curve_size = gamma_size_reply->size;
free(gamma_size_reply);
/* Acquire curve control */
gamma_get_cookie = xcb_randr_get_crtc_gamma(connection, *crtcs);
gamma_get_reply = xcb_randr_get_crtc_gamma_reply(connection, gamma_get_cookie, &error);
if (error)
{
fprintf(stderr, "RANDR CRTC gamma query returned %i\n", error->error_code);
xcb_disconnect(connection);
return 1;
}
r_gamma = xcb_randr_get_crtc_gamma_red(gamma_get_reply);
g_gamma = xcb_randr_get_crtc_gamma_green(gamma_get_reply);
b_gamma = xcb_randr_get_crtc_gamma_blue(gamma_get_reply);
/* Set curves */
for (i = 0; i < curve_size; i++)
{
*(r_gamma + i) = (1 << 16) - 1 - *(r_gamma + i);
*(g_gamma + i) = (1 << 16) - 1 - *(g_gamma + i);
*(b_gamma + i) = (1 << 16) - 1 - *(b_gamma + i);
}
/* Apply curves */
gamma_set_cookie = xcb_randr_set_crtc_gamma_checked(connection, *crtcs, curve_size, r_gamma, g_gamma, b_gamma);
error = xcb_request_check(connection, gamma_set_cookie);
if (error)
{
fprintf(stderr, "RANDR CRTC control returned %i\n", error->error_code);
return 1;
}
free(gamma_get_reply);
/* Next CRTC */
next_crtc:
crtcs++;
use_crtcs >>= 1;
}
/* Free remaining resources */
free(res_reply);
xcb_disconnect(connection);
return 0;
}
|
