Re: Emacs canvas support

[Eli Zaretskii]

> From: Stefan Monnier <address@hidden>
> Cc: address@hidden,  address@hidden
> Date: Thu, 30 Apr 2020 10:37:03 -0400
> 
> > Unfortunately, most redisplay cycles don't start from a request to
> > redraw a particular area of the screen.
> 
> I don't think it makes a big difference.  Upon redisplay, the
> glyph-matrix layer will compute which parts of the window needs updates
> in the that layer (exactly like it currently does), and the canvas will
> do its own computation of which part of it needs updating (presumably
> this will be handled by the external canvas library such as Cairo's
> rather than by Emacs's own code) and then the compositing layer will
> figure out how to combine those two changes.

I don't think I understand how this would fit into the current
redisplay framework.