[Xquartz-dev] Screen dimensions

[Jeremy Huddleston]

On Dec 8, 2008, at 15:38, Harald Hanche-Olsen wrote:

> + Jeremy Huddleston <jeremyhu at apple.com>:
>
>> What version are you running?  Leopard versions of X11 should  
>> report a hard-coded value of 75dpi, and starting with 2.3.2_beta??,  
>> it reports 96dpi:
>
> Hmm. Don't modern displays actually communicate both physical  
> dimensions and the number of pixels to the host computer over the  
> DVI interface (or VGA even)? Why is there a need to hard code screen  
> resolutions?

X11 doesn't know about the difference between multiple monitors.  It  
is seen as one large display, so we can't say "display 0 is 96dpi and  
display 1 is 110dpi"