|
0
|
1 /*
|
|
|
2 SDL - Simple DirectMedia Layer
|
|
|
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
|
|
|
4
|
|
|
5 This library is free software; you can redistribute it and/or
|
|
|
6 modify it under the terms of the GNU Library General Public
|
|
|
7 License as published by the Free Software Foundation; either
|
|
|
8 version 2 of the License, or (at your option) any later version.
|
|
|
9
|
|
|
10 This library is distributed in the hope that it will be useful,
|
|
|
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
13 Library General Public License for more details.
|
|
|
14
|
|
|
15 You should have received a copy of the GNU Library General Public
|
|
|
16 License along with this library; if not, write to the Free
|
|
|
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
18
|
|
|
19 Sam Lantinga
|
|
|
20 slouken@devolution.com
|
|
|
21 */
|
|
|
22
|
|
|
23 #ifdef SAVE_RCSID
|
|
|
24 static char rcsid =
|
|
|
25 "@(#) $Id$";
|
|
|
26 #endif
|
|
|
27
|
|
|
28 #include "SDL.h"
|
|
|
29 #include "SDL_events.h"
|
|
|
30 #include "SDL_events_c.h"
|
|
|
31 #include "SDL_x11video.h"
|
|
|
32
|
|
|
33 /* From the X server sources... */
|
|
|
34 #define MAX_GAMMA 10.0
|
|
|
35 #define MIN_GAMMA (1.0/MAX_GAMMA)
|
|
|
36
|
|
|
37 static int X11_SetGammaNoLock(_THIS, float red, float green, float blue)
|
|
|
38 {
|
|
|
39 #ifdef XFREE86_VMGAMMA
|
|
|
40 if (use_vidmode) {
|
|
|
41 XF86VidModeGamma gamma;
|
|
|
42 Bool succeeded;
|
|
|
43
|
|
|
44 /* Clamp the gamma values */
|
|
|
45 if ( red < MIN_GAMMA ) {
|
|
|
46 gamma.red = MIN_GAMMA;
|
|
|
47 } else
|
|
|
48 if ( red > MAX_GAMMA ) {
|
|
|
49 gamma.red = MAX_GAMMA;
|
|
|
50 } else {
|
|
|
51 gamma.red = red;
|
|
|
52 }
|
|
|
53 if ( green < MIN_GAMMA ) {
|
|
|
54 gamma.green = MIN_GAMMA;
|
|
|
55 } else
|
|
|
56 if ( green > MAX_GAMMA ) {
|
|
|
57 gamma.green = MAX_GAMMA;
|
|
|
58 } else {
|
|
|
59 gamma.green = green;
|
|
|
60 }
|
|
|
61 if ( blue < MIN_GAMMA ) {
|
|
|
62 gamma.blue = MIN_GAMMA;
|
|
|
63 } else
|
|
|
64 if ( blue > MAX_GAMMA ) {
|
|
|
65 gamma.blue = MAX_GAMMA;
|
|
|
66 } else {
|
|
|
67 gamma.blue = blue;
|
|
|
68 }
|
|
|
69 if ( SDL_GetAppState() & SDL_APPACTIVE ) {
|
|
|
70 succeeded = XVidMode(SetGamma, (SDL_Display, SDL_Screen, &gamma));
|
|
|
71 XSync(SDL_Display, False);
|
|
|
72 } else {
|
|
|
73 gamma_saved[0] = gamma.red;
|
|
|
74 gamma_saved[1] = gamma.green;
|
|
|
75 gamma_saved[2] = gamma.blue;
|
|
|
76 succeeded = True;
|
|
|
77 }
|
|
|
78 if ( succeeded ) {
|
|
|
79 ++gamma_changed;
|
|
|
80 }
|
|
|
81 return succeeded ? 0 : -1;
|
|
|
82 }
|
|
|
83 #endif
|
|
|
84 SDL_SetError("Gamma correction not supported");
|
|
|
85 return -1;
|
|
|
86 }
|
|
|
87 int X11_SetVidModeGamma(_THIS, float red, float green, float blue)
|
|
|
88 {
|
|
|
89 int result;
|
|
|
90
|
|
|
91 SDL_Lock_EventThread();
|
|
|
92 result = X11_SetGammaNoLock(this, red, green, blue);
|
|
|
93 SDL_Unlock_EventThread();
|
|
|
94
|
|
|
95 return(result);
|
|
|
96 }
|
|
|
97
|
|
|
98 static int X11_GetGammaNoLock(_THIS, float *red, float *green, float *blue)
|
|
|
99 {
|
|
|
100 #ifdef XFREE86_VMGAMMA
|
|
|
101 if (use_vidmode) {
|
|
|
102 XF86VidModeGamma gamma;
|
|
|
103 if (XVidMode(GetGamma, (SDL_Display, SDL_Screen, &gamma))) {
|
|
|
104 *red = gamma.red;
|
|
|
105 *green = gamma.green;
|
|
|
106 *blue = gamma.blue;
|
|
|
107 return 0;
|
|
|
108 }
|
|
|
109 return -1;
|
|
|
110 }
|
|
|
111 #endif
|
|
|
112 SDL_SetError("Gamma correction not supported");
|
|
|
113 return -1;
|
|
|
114 }
|
|
|
115 int X11_GetVidModeGamma(_THIS, float *red, float *green, float *blue)
|
|
|
116 {
|
|
|
117 int result;
|
|
|
118
|
|
|
119 SDL_Lock_EventThread();
|
|
|
120 result = X11_GetGammaNoLock(this, red, green, blue);
|
|
|
121 SDL_Unlock_EventThread();
|
|
|
122
|
|
|
123 return(result);
|
|
|
124 }
|
|
|
125
|
|
|
126 void X11_SaveVidModeGamma(_THIS)
|
|
|
127 {
|
|
|
128 /* Try to save the current gamma, otherwise disable gamma control */
|
|
|
129 if ( X11_GetGammaNoLock(this,
|
|
|
130 &gamma_saved[0], &gamma_saved[1], &gamma_saved[2]) < 0 ) {
|
|
|
131 this->SetGamma = 0;
|
|
|
132 this->GetGamma = 0;
|
|
|
133 }
|
|
|
134 gamma_changed = 0;
|
|
|
135 }
|
|
|
136 void X11_SwapVidModeGamma(_THIS)
|
|
|
137 {
|
|
|
138 float new_gamma[3];
|
|
|
139
|
|
|
140 if ( gamma_changed ) {
|
|
|
141 new_gamma[0] = gamma_saved[0];
|
|
|
142 new_gamma[1] = gamma_saved[1];
|
|
|
143 new_gamma[2] = gamma_saved[2];
|
|
|
144 X11_GetGammaNoLock(this, &gamma_saved[0], &gamma_saved[1], &gamma_saved[2]);
|
|
|
145 X11_SetGammaNoLock(this, new_gamma[0], new_gamma[1], new_gamma[2]);
|
|
|
146 }
|
|
|
147 }
|
