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
|
/**
* 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 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "blueshift_vidmode_c.h"
/**
* The X server display
*/
static Display* display;
/**
* The X screen
*/
static int screen;
/**
* Size of colour curves on the X-axis
*/
static int curve_size;
/**
* Start stage of colour curve control
*
* @param use_screen The screen to use
* @return Zero on error, otherwise the size of colours curves
*/
int blueshift_vidmode_open(int use_screen)
{
int _major, _minor;
/* Get X display */
if ((display = XOpenDisplay(NULL)) == NULL)
{
fprintf(stderr, "Cannot open X display\n");
return 0;
}
/* Check for VidMode extension */
if (XF86VidModeQueryVersion(display, &_major, &_minor) == 0)
{
fprintf(stderr, "VidMode version query failed\n");
XCloseDisplay(display);
return 0;
}
/* Get curve X-axis size */
screen = use_screen;
if (XF86VidModeGetGammaRampSize(display, screen, &curve_size) == 0)
{
fprintf(stderr, "VidMode gamma size query failed\n");
XCloseDisplay(display);
return 0;
}
if (curve_size <= 1)
{
fprintf(stderr, "VidMode gamma size query failed, impossible dimension\n");
XCloseDisplay(display);
return 0;
}
return curve_size;
}
/**
* Gets the current colour curves
*
* @param use_crtc The CRTC to use
* @param r_gamma Storage location for the red colour curve
* @param g_gamma Storage location for the green colour curve
* @param b_gamma Storage location for the blue colour curve
* @return Zero on success
*/
int blueshift_vidmode_read(int use_crtc, uint16_t* r_gamma, uint16_t* g_gamma, uint16_t* b_gamma)
{
(void) use_crtc;
/* Read curves */
if (XF86VidModeGetGammaRamp(display, screen, curve_size, r_gamma, g_gamma, b_gamma) == 0)
{
fprintf(stderr, "VidMode gamma query failed\n");
XCloseDisplay(display);
return 1;
}
return 0;
}
/**
* Apply stage of colour curve control
*
* @param use_crtcs Mask of CRTC:s to use
* @param r_curve The red colour curve
* @param g_curve The green colour curve
* @param b_curve The blue colour curve
* @return Zero on success
*/
int blueshift_vidmode_apply(uint64_t use_crtcs, uint16_t* r_curve, uint16_t* g_curve, uint16_t* b_curve)
{
(void) use_crtcs;
/* Apply curves */
if (XF86VidModeSetGammaRamp(display, screen, curve_size, r_curve, g_curve, b_curve) == 0)
{
fprintf(stderr, "VidMode gamma control failed\n");
return 1;
}
return 0;
}
/**
* Resource freeing stage of colour curve control
*/
void blueshift_vidmode_close(void)
{
/* Free remaining resources */
XCloseDisplay(display);
}
|
