143 lines
4 KiB
C
143 lines
4 KiB
C
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/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#include "SDL.h"
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#include "SDL_events.h"
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#include "../../events/SDL_events_c.h"
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#include "SDL_x11video.h"
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/* From the X server sources... */
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#define MAX_GAMMA 10.0
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#define MIN_GAMMA (1.0/MAX_GAMMA)
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static int X11_SetGammaNoLock(_THIS, float red, float green, float blue)
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{
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#if SDL_VIDEO_DRIVER_X11_VIDMODE
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if (use_vidmode >= 200) {
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SDL_NAME(XF86VidModeGamma) gamma;
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Bool succeeded;
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/* Clamp the gamma values */
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if ( red < MIN_GAMMA ) {
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gamma.red = MIN_GAMMA;
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} else
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if ( red > MAX_GAMMA ) {
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gamma.red = MAX_GAMMA;
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} else {
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gamma.red = red;
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}
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if ( green < MIN_GAMMA ) {
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gamma.green = MIN_GAMMA;
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} else
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if ( green > MAX_GAMMA ) {
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gamma.green = MAX_GAMMA;
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} else {
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gamma.green = green;
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}
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if ( blue < MIN_GAMMA ) {
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gamma.blue = MIN_GAMMA;
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} else
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if ( blue > MAX_GAMMA ) {
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gamma.blue = MAX_GAMMA;
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} else {
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gamma.blue = blue;
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}
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if ( SDL_GetAppState() & SDL_APPACTIVE ) {
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succeeded = SDL_NAME(XF86VidModeSetGamma)(SDL_Display, SDL_Screen, &gamma);
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XSync(SDL_Display, False);
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} else {
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gamma_saved[0] = gamma.red;
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gamma_saved[1] = gamma.green;
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gamma_saved[2] = gamma.blue;
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succeeded = True;
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}
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if ( succeeded ) {
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++gamma_changed;
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}
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return succeeded ? 0 : -1;
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}
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#endif
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SDL_SetError("Gamma correction not supported");
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return -1;
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}
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int X11_SetVidModeGamma(_THIS, float red, float green, float blue)
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{
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int result;
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SDL_Lock_EventThread();
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result = X11_SetGammaNoLock(this, red, green, blue);
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SDL_Unlock_EventThread();
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return(result);
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}
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static int X11_GetGammaNoLock(_THIS, float *red, float *green, float *blue)
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{
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#if SDL_VIDEO_DRIVER_X11_VIDMODE
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if (use_vidmode >= 200) {
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SDL_NAME(XF86VidModeGamma) gamma;
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if (SDL_NAME(XF86VidModeGetGamma)(SDL_Display, SDL_Screen, &gamma)) {
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*red = gamma.red;
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*green = gamma.green;
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*blue = gamma.blue;
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return 0;
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}
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return -1;
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}
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#endif
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return -1;
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}
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int X11_GetVidModeGamma(_THIS, float *red, float *green, float *blue)
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{
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int result;
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SDL_Lock_EventThread();
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result = X11_GetGammaNoLock(this, red, green, blue);
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SDL_Unlock_EventThread();
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return(result);
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}
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void X11_SaveVidModeGamma(_THIS)
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{
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/* Try to save the current gamma, otherwise disable gamma control */
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if ( X11_GetGammaNoLock(this,
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&gamma_saved[0], &gamma_saved[1], &gamma_saved[2]) < 0 ) {
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this->SetGamma = 0;
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this->GetGamma = 0;
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}
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gamma_changed = 0;
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}
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void X11_SwapVidModeGamma(_THIS)
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{
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float new_gamma[3];
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if ( gamma_changed ) {
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new_gamma[0] = gamma_saved[0];
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new_gamma[1] = gamma_saved[1];
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new_gamma[2] = gamma_saved[2];
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X11_GetGammaNoLock(this, &gamma_saved[0], &gamma_saved[1], &gamma_saved[2]);
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X11_SetGammaNoLock(this, new_gamma[0], new_gamma[1], new_gamma[2]);
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}
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}
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