Mercurial > sdl-ios-xcode
view src/video/x11/SDL_x11gamma.c @ 4207:a673f44949d6 SDL-1.2
Fixed bug #562
this patch by Diego Pettenò <flameeyes@gentoo.org> for SDL-1.2:
The attached patch applies over latest ~arch SDL version, and allows to use the
xinerama support to launch an application full screened on the head "0".
The SDL_VIDEO_FULLSCREEN_HEAD environment variable sets the head on which the
full screen will be displayed, but if you set it to 0, the code simply ignores
it as unset. My patch changes the unset value to -1, so that the 0 value can be
used correctly. Without this, trying to get fullscreen on head 0 would get the
same result than not having xinerama enabled at all.
http://sources.gentoo.org/media-libs/libsdl/files/libsdl-1.2.11-xinerama-head-0.patch
SDL-1.3 doesnt seem to have any code like this, but it's still good for SDL-1.2
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Mon, 21 Sep 2009 07:20:51 +0000 |
parents | a1b03ba2fcd0 |
children |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2009 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]); } }