Mercurial > sdl-ios-xcode
annotate src/video/x11/SDL_x11gamma.c @ 90:ee1f71c10889
Fix to allow SDL compiled under XFree v4 to work with XFree v3 xservers.
Contributed by Jarek Sobieszek
| author | Sam Lantinga <slouken@lokigames.com> |
|---|---|
| date | Sat, 07 Jul 2001 08:08:42 +0000 |
| parents | 74212992fb08 |
| children | a1c973c35fef |
| rev | line source |
|---|---|
| 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 | |
|
90
ee1f71c10889
Fix to allow SDL compiled under XFree v4 to work with XFree v3 xservers.
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
40 if (use_vidmode >= 2) { |
| 0 | 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 | |
|
90
ee1f71c10889
Fix to allow SDL compiled under XFree v4 to work with XFree v3 xservers.
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
101 if (use_vidmode >= 2) { |
| 0 | 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 } |