XF86VidModeSetGammaRamp documentation

[Hal V. Engel]

On Tuesday 05 May 2009 10:57:43 am tsuraan wrote:
> The man page for XF86VidModeSetGammaRamp says to check the source for
> info on how to use it.  Where can I find this source?  On my system,
> the function is declared in X11/extensions/xf86vmode.h, which is a
> member of the xf86vidmodeproto package, but that source tarball
> doesn't contain any actual source files.  I can find references to
> SetGammaRamp in the xorg-server source, but at that point the actual
> arguments to the client-side function are lost, so I still have no
> idea how to call the function.  Any pointers would be much
> appreciated.

The best thing is to find some user land code examples.  I use these function 
calls in the software that I support and that code might give you some clues 
about how to use this API.  My software is LProf which is on sourceforge 
http://sourceforge.net/projects/lprof/ .  You can find this code in 
src/videoLUTutils/* of the source tree.  Look in LUTutil.h, LUTutil.cpp and 
LUTutil-X11.cpp. 

But also keep in mind that this API is now depreciated since it is being 
replaced by a similar API from the XRandR 1.2 libraries.   LProf currently 
does not have LUT support for XRandR since the drivers for my video card do 
not have XRandR 1.2 support yet.

Hal