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SDL_x11gamma.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@devolution.com
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif
#include "SDL.h"
#include "SDL_events.h"
#include "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)
{
#ifdef XFREE86_VMGAMMA
if (use_vidmode) {
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 = XVidMode(SetGamma, (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)
{
#ifdef XFREE86_VMGAMMA
if (use_vidmode) {
XF86VidModeGamma gamma;
if (XVidMode(GetGamma, (SDL_Display, SDL_Screen, &gamma))) {
*red = gamma.red;
*green = gamma.green;
*blue = gamma.blue;
return 0;
}
return -1;
}
#endif
SDL_SetError("Gamma correction not supported");
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]);
}
}