Re: Get ID of x-window

[Johann Klammer]

On 08/14/2014 01:20 PM, Egmont Koblinger wrote:
> Hi,
>
> $WINDOWID might be what you're looking for.
>
> Note that whatever you do, it'll probably be an ugly hack that just
> happens to work with your favorite terminal at a hardcoded font size.
> E.g. how would your X app figure out the terminal's font size?
>
> Also, keep in mind that there are terminals that have multiple tabs and
> your one might not be the visible one (e.g. gnome-terminal -- also
> beware that it's known in gnome-terminal that if you drag-n-drop a tab
> to another gnome-terminal window then $WINDOWID becomes incorrect
> because it can't be updated); there are terminals with split screen
> feature (e.g. gnome terminator) and then how do you figure out the
> offset; etc...
>
> e.

I believe this is very much what w3m-img does(the html browser) to 
render those image tags. And yes, there's mild differences between each 
of the common terminal emulators(not sure how they do it..).
@see:
<http://anonscm.debian.org/cgit/collab-maint/w3m.git/tree/w3mimg/x11/x11_w3mimg.c>

(around line 696)