| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 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 | } |