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
|
/**
* 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_w32gdi_c.h"
/**
* The number of CRTC:s on the system
*/
static int crtc_count;
/**
* The device contexts for each CRTC
*/
static HDC* crtcs;
/**
* Start stage of colour curve control
*
* @return Zero on success
*/
int blueshift_w32gdi_open(void)
{
int c;
HDC hDC;
DISPLAY_DEVICE display;
display.cb = sizeof(DISPLAY_DEVICE);
crtc_count = 0;
while (EnumDisplayDevices(NULL, crtc_count, &display, 0))
crtc_count++;
if (crtc_count == 0)
{
crtcs = NULL;
return 0;
}
crtcs = malloc(crtc_count * sizeof(HDC));
if (crtcs == NULL)
{
fprintf(stderr, "Out of memory\n");
return 1;
}
for (c = 0; c < crtc_count; c++)
{
/* Open device context */
if (EnumDisplayDevices(NULL, c, &display, 0) == FALSE)
{
fprintf(stderr, "Cannot find display, are you unplugging stuff?\n");
crtc_count = c;
return 1;
}
if (!(display.StateFlags & DISPLAY_DEVICE_ACTIVE))
{
fprintf(stderr, "Cannot to open device context, it is not active\n");
crtc_count = c;
return 1;
}
hDC = *(crtcs + c) = CreateDC(TEXT("DISPLAY"), display.DeviceName, NULL, NULL);
if (hDC == NULL)
{
fprintf(stderr, "Unable to open device context\n");
crtc_count = c;
return 1;
}
/* Check support for gamma ramps */
if (GetDeviceCaps(hDC, COLORMGMTCAPS) != CM_GAMMA_RAMP)
{
fprintf(stderr, "CRTC %i does not support gamma ramps\n", c);
ReleaseDC(NULL, hDC);
crtc_count = c;
return 1;
}
}
return 0;
}
/**
* Get the number of CRTC:s on the system
*
* @return The number of CRTC:s on the system
*/
int blueshift_w32gdi_crtc_count(void)
{
return crtc_count;
}
/**
* Gets the current colour curves
*
* @param use_crtc The CRTC to use
* @return {the size of the each curve, *the red curve,
* *the green curve, *the blue curve},
* needs to be free:d. `NULL` on error.
*/
uint16_t* blueshift_w32gdi_read(int use_crtc)
{
uint16_t* rc = NULL;
if ((use_crtc < 0) || (use_crtc >= crtc_count))
fprintf(stderr, "CRTC %i does not exist\n", use_crtc);
else
{
rc = malloc((1 + 3 * GAMMA_RAMP_SIZE) * sizeof(uint16_t));
if (rc == NULL)
fprintf(stderr, "Out of memory\n");
else
{
*rc = GAMMA_RAMP_SIZE;
if (GetDeviceGammaRamp(*(crtcs + use_crtc), rc + 1) == FALSE)
{
fprintf(stderr, "Unable to read current gamma ramps from CRTC %i\n", use_crtc);
free(rc);
rc = NULL;
}
}
}
return rc;
}
/**
* Apply stage of colour curve control
*
* @param use_crtc The CRTC to use, -1 for all
* @param rgb_curve The concatenation of the red, the green and the blue colour curves
* @return Zero on success
*/
int blueshift_w32gdi_apply(int use_crtc, uint16_t* rgb_curves)
{
int r = 1;
if (use_crtc < crtc_count)
{
int c = use_crtc < 0 ? 0 : use_crtc;
int n = use_crtc < 0 ? crtc_count : (use_crtc + 1);
for (; c < n; c++)
if (!(r = SetDeviceGammaRamp(*(crtcs + c), rgb_curves)))
{
fprintf(stderr, "Unable to set gamma ramps\n");
break;
}
}
else
fprintf(stderr, "CRTC %i does not exist\n", use_crtc);
return !r;
}
/**
* Resource freeing stage of colour curve control
*/
void blueshift_w32gdi_close(void)
{
int c;
for (c = 0; c < crtc_count; c++)
ReleaseDC(NULL, *(crtcs + c));
if (crtcs != NULL)
free(crtcs);
}
|
