diff options
Diffstat (limited to 'apps/plugins/sdl/src/video/x11/SDL_x11gamma.c')
-rw-r--r-- | apps/plugins/sdl/src/video/x11/SDL_x11gamma.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/apps/plugins/sdl/src/video/x11/SDL_x11gamma.c b/apps/plugins/sdl/src/video/x11/SDL_x11gamma.c new file mode 100644 index 0000000000..c6afbda11c --- /dev/null +++ b/apps/plugins/sdl/src/video/x11/SDL_x11gamma.c | |||
@@ -0,0 +1,142 @@ | |||
1 | /* | ||
2 | SDL - Simple DirectMedia Layer | ||
3 | Copyright (C) 1997-2012 Sam Lantinga | ||
4 | |||
5 | This library is free software; you can redistribute it and/or | ||
6 | modify it under the terms of the GNU Lesser General Public | ||
7 | License as published by the Free Software Foundation; either | ||
8 | version 2.1 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 | Lesser General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU Lesser General Public | ||
16 | License along with this library; if not, write to the Free Software | ||
17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | ||
18 | |||
19 | Sam Lantinga | ||
20 | slouken@libsdl.org | ||
21 | */ | ||
22 | #include "SDL_config.h" | ||
23 | |||
24 | #include "SDL.h" | ||
25 | #include "SDL_events.h" | ||
26 | #include "../../events/SDL_events_c.h" | ||
27 | #include "SDL_x11video.h" | ||
28 | |||
29 | /* From the X server sources... */ | ||
30 | #define MAX_GAMMA 10.0 | ||
31 | #define MIN_GAMMA (1.0/MAX_GAMMA) | ||
32 | |||
33 | static int X11_SetGammaNoLock(_THIS, float red, float green, float blue) | ||
34 | { | ||
35 | #if SDL_VIDEO_DRIVER_X11_VIDMODE | ||
36 | if (use_vidmode >= 200) { | ||
37 | SDL_NAME(XF86VidModeGamma) gamma; | ||
38 | Bool succeeded; | ||
39 | |||
40 | /* Clamp the gamma values */ | ||
41 | if ( red < MIN_GAMMA ) { | ||
42 | gamma.red = MIN_GAMMA; | ||
43 | } else | ||
44 | if ( red > MAX_GAMMA ) { | ||
45 | gamma.red = MAX_GAMMA; | ||
46 | } else { | ||
47 | gamma.red = red; | ||
48 | } | ||
49 | if ( green < MIN_GAMMA ) { | ||
50 | gamma.green = MIN_GAMMA; | ||
51 | } else | ||
52 | if ( green > MAX_GAMMA ) { | ||
53 | gamma.green = MAX_GAMMA; | ||
54 | } else { | ||
55 | gamma.green = green; | ||
56 | } | ||
57 | if ( blue < MIN_GAMMA ) { | ||
58 | gamma.blue = MIN_GAMMA; | ||
59 | } else | ||
60 | if ( blue > MAX_GAMMA ) { | ||
61 | gamma.blue = MAX_GAMMA; | ||
62 | } else { | ||
63 | gamma.blue = blue; | ||
64 | } | ||
65 | if ( SDL_GetAppState() & SDL_APPACTIVE ) { | ||
66 | succeeded = SDL_NAME(XF86VidModeSetGamma)(SDL_Display, SDL_Screen, &gamma); | ||
67 | XSync(SDL_Display, False); | ||
68 | } else { | ||
69 | gamma_saved[0] = gamma.red; | ||
70 | gamma_saved[1] = gamma.green; | ||
71 | gamma_saved[2] = gamma.blue; | ||
72 | succeeded = True; | ||
73 | } | ||
74 | if ( succeeded ) { | ||
75 | ++gamma_changed; | ||
76 | } | ||
77 | return succeeded ? 0 : -1; | ||
78 | } | ||
79 | #endif | ||
80 | SDL_SetError("Gamma correction not supported"); | ||
81 | return -1; | ||
82 | } | ||
83 | int X11_SetVidModeGamma(_THIS, float red, float green, float blue) | ||
84 | { | ||
85 | int result; | ||
86 | |||
87 | SDL_Lock_EventThread(); | ||
88 | result = X11_SetGammaNoLock(this, red, green, blue); | ||
89 | SDL_Unlock_EventThread(); | ||
90 | |||
91 | return(result); | ||
92 | } | ||
93 | |||
94 | static int X11_GetGammaNoLock(_THIS, float *red, float *green, float *blue) | ||
95 | { | ||
96 | #if SDL_VIDEO_DRIVER_X11_VIDMODE | ||
97 | if (use_vidmode >= 200) { | ||
98 | SDL_NAME(XF86VidModeGamma) gamma; | ||
99 | if (SDL_NAME(XF86VidModeGetGamma)(SDL_Display, SDL_Screen, &gamma)) { | ||
100 | *red = gamma.red; | ||
101 | *green = gamma.green; | ||
102 | *blue = gamma.blue; | ||
103 | return 0; | ||
104 | } | ||
105 | return -1; | ||
106 | } | ||
107 | #endif | ||
108 | return -1; | ||
109 | } | ||
110 | int X11_GetVidModeGamma(_THIS, float *red, float *green, float *blue) | ||
111 | { | ||
112 | int result; | ||
113 | |||
114 | SDL_Lock_EventThread(); | ||
115 | result = X11_GetGammaNoLock(this, red, green, blue); | ||
116 | SDL_Unlock_EventThread(); | ||
117 | |||
118 | return(result); | ||
119 | } | ||
120 | |||
121 | void X11_SaveVidModeGamma(_THIS) | ||
122 | { | ||
123 | /* Try to save the current gamma, otherwise disable gamma control */ | ||
124 | if ( X11_GetGammaNoLock(this, | ||
125 | &gamma_saved[0], &gamma_saved[1], &gamma_saved[2]) < 0 ) { | ||
126 | this->SetGamma = 0; | ||
127 | this->GetGamma = 0; | ||
128 | } | ||
129 | gamma_changed = 0; | ||
130 | } | ||
131 | void X11_SwapVidModeGamma(_THIS) | ||
132 | { | ||
133 | float new_gamma[3]; | ||
134 | |||
135 | if ( gamma_changed ) { | ||
136 | new_gamma[0] = gamma_saved[0]; | ||
137 | new_gamma[1] = gamma_saved[1]; | ||
138 | new_gamma[2] = gamma_saved[2]; | ||
139 | X11_GetGammaNoLock(this, &gamma_saved[0], &gamma_saved[1], &gamma_saved[2]); | ||
140 | X11_SetGammaNoLock(this, new_gamma[0], new_gamma[1], new_gamma[2]); | ||
141 | } | ||
142 | } | ||