Re: Introducing emacs-webkit and more thoughts on Emacs rendering (was Rethinking the design of xwidgets)

[Arthur Miller]

Eli Zaretskii <eliz@gnu.org> writes:

> As long as the widget can be told to use a given rectangular portion
> of the screen, we should be fine: the current Emacs display engine is
> perfectly capable of handling display elements that occupy an area of
> certain dimensions.

How can I tell any drawing routines to use certain rectangular area on
display so it is in harmony with Emacs display engine? I thought it was
done with faces and inserting characters with certain face; but I am not
sure how it was actually done.

Are there callbacks I can connect too if I would like to update opengl
viewport that I can hook easily into? Where do I look? I am not sure I
understand it from image.c; it was there I was looking. I never looked
into xwidgets though. Can be just me; but if you can point me to right
place to look at I am thankful.