diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/video/x11/SDL_x11gamma.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/video/x11/SDL_x11gamma.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/video/x11/SDL_x11gamma.c b/distrib/sdl-1.2.15/src/video/x11/SDL_x11gamma.c new file mode 100644 index 0000000..c6afbda --- /dev/null +++ b/distrib/sdl-1.2.15/src/video/x11/SDL_x11gamma.c @@ -0,0 +1,142 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997-2012 Sam Lantinga + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + + Sam Lantinga + slouken@libsdl.org +*/ +#include "SDL_config.h" + +#include "SDL.h" +#include "SDL_events.h" +#include "../../events/SDL_events_c.h" +#include "SDL_x11video.h" + +/* From the X server sources... */ +#define MAX_GAMMA 10.0 +#define MIN_GAMMA (1.0/MAX_GAMMA) + +static int X11_SetGammaNoLock(_THIS, float red, float green, float blue) +{ +#if SDL_VIDEO_DRIVER_X11_VIDMODE + if (use_vidmode >= 200) { + SDL_NAME(XF86VidModeGamma) gamma; + Bool succeeded; + + /* Clamp the gamma values */ + if ( red < MIN_GAMMA ) { + gamma.red = MIN_GAMMA; + } else + if ( red > MAX_GAMMA ) { + gamma.red = MAX_GAMMA; + } else { + gamma.red = red; + } + if ( green < MIN_GAMMA ) { + gamma.green = MIN_GAMMA; + } else + if ( green > MAX_GAMMA ) { + gamma.green = MAX_GAMMA; + } else { + gamma.green = green; + } + if ( blue < MIN_GAMMA ) { + gamma.blue = MIN_GAMMA; + } else + if ( blue > MAX_GAMMA ) { + gamma.blue = MAX_GAMMA; + } else { + gamma.blue = blue; + } + if ( SDL_GetAppState() & SDL_APPACTIVE ) { + succeeded = SDL_NAME(XF86VidModeSetGamma)(SDL_Display, SDL_Screen, &gamma); + XSync(SDL_Display, False); + } else { + gamma_saved[0] = gamma.red; + gamma_saved[1] = gamma.green; + gamma_saved[2] = gamma.blue; + succeeded = True; + } + if ( succeeded ) { + ++gamma_changed; + } + return succeeded ? 0 : -1; + } +#endif + SDL_SetError("Gamma correction not supported"); + return -1; +} +int X11_SetVidModeGamma(_THIS, float red, float green, float blue) +{ + int result; + + SDL_Lock_EventThread(); + result = X11_SetGammaNoLock(this, red, green, blue); + SDL_Unlock_EventThread(); + + return(result); +} + +static int X11_GetGammaNoLock(_THIS, float *red, float *green, float *blue) +{ +#if SDL_VIDEO_DRIVER_X11_VIDMODE + if (use_vidmode >= 200) { + SDL_NAME(XF86VidModeGamma) gamma; + if (SDL_NAME(XF86VidModeGetGamma)(SDL_Display, SDL_Screen, &gamma)) { + *red = gamma.red; + *green = gamma.green; + *blue = gamma.blue; + return 0; + } + return -1; + } +#endif + return -1; +} +int X11_GetVidModeGamma(_THIS, float *red, float *green, float *blue) +{ + int result; + + SDL_Lock_EventThread(); + result = X11_GetGammaNoLock(this, red, green, blue); + SDL_Unlock_EventThread(); + + return(result); +} + +void X11_SaveVidModeGamma(_THIS) +{ + /* Try to save the current gamma, otherwise disable gamma control */ + if ( X11_GetGammaNoLock(this, + &gamma_saved[0], &gamma_saved[1], &gamma_saved[2]) < 0 ) { + this->SetGamma = 0; + this->GetGamma = 0; + } + gamma_changed = 0; +} +void X11_SwapVidModeGamma(_THIS) +{ + float new_gamma[3]; + + if ( gamma_changed ) { + new_gamma[0] = gamma_saved[0]; + new_gamma[1] = gamma_saved[1]; + new_gamma[2] = gamma_saved[2]; + X11_GetGammaNoLock(this, &gamma_saved[0], &gamma_saved[1], &gamma_saved[2]); + X11_SetGammaNoLock(this, new_gamma[0], new_gamma[1], new_gamma[2]); + } +} |