[Openicc] ICC Profiles In X Specification

[Hal V. Engel]

On Thursday 15 November 2007 23:42:36 Jon A. Cruz wrote:
> (I'm not familiar with current Qt code on this front. However it  
> seems like it might hide the "X11 Screen" concept and just expose  
> "monitors" directly but call them "screens"... then again their docs  
> might be just  a little misleading).

This correct.  In LProf we pass the "screen" which is returned by the  
QDesktopWidget::screenNumber(..) call to the code that works with the video 
card gamma tables.  This Qt fuction is passed the global coordinates of 
something that is on the physical device we want to calibrate and the 
returned value is used directly without any manipulation to work with the 
physical device using X11 calls to get and update the video card gamma table.   
For Windows and OS/X this Qt call does not return a handle to the physical 
device and instead it appears to return a handle to the logical display.

One caviot is that Qt must be built with the Qt xinerama functionality enabled 
to work correctly otherwise it only sees one "screen" even if there is more 
than one.

Hal