Re: gtk layering

["Bill Cunningham" <billcm charter net>]

----- Original Message ----- 
From: "Bill Cunningham" <billcm charter net>
To: <paul linuxaudiosystems com>
Cc: <gtk-list gnome org>
Sent: Wednesday, October 04, 2006 10:55 AM
Subject: Re: gtk layering


>
> ----- Original Message ----- 
> From: "Paul Davis" <paul linuxaudiosystems com>
> To: "Bill Cunningham" <billcm charter net>
> Cc: "Matt Hoosier" <mwhoosier gmail com>; <gtk-list gnome org>
> Sent: Wednesday, October 04, 2006 9:35 AM
> Subject: Re: gtk layering
>
>
> > On Wed, 2006-10-04 at 01:19 -0400, Bill Cunningham wrote:
> > > ----- Original Message ----- 
> > > From: "Matt Hoosier" <mwhoosier gmail com>
> > > To: "Bill Cunningham" <billcm charter net>
> > > Cc: <gtk-list gnome org>
> > > Sent: Wednesday, October 04, 2006 1:12 AM
> > > Subject: Re: gtk layering
> > >
> > >
> > > > Bill,
> > > >
> > > > glib and X11 are orthogonal; neither depends on the other. Gtk+ uses
> > > > each one directly.
> > >
> > >     I see. Thanks Matt. These internals are fascinating to me. I
> understand
> > > things better. Does gtk use glib for frame buffering or just X? What
> does
> > > gtk use pango and cairo for?
> >
> > lets be a little more accurate.
> >
> > Gtk does not use X11 directly at all.
> >
> > Gtk uses glib to provide data structures and portability for general
> > programming.
> >
> > Gtk uses Gdk to provide a set of mechanisms for creating windows,
> > drawing various kinds of things in them, managing their visibility and
> > handling events from a window system. There are implementations of Gdk
> > that work with X11, with the win32 GUI API (not sure which level it sits
> > at, possibly GDI but i don't know), with Aqua and with the linux
> > DirectFb API (amongst others). the window system is what actually
> > implements the things that Gdk is merely a wrapper around.
> >
> > Pango is a library that handles drawing and data management for fonts
> > and text. It has a variety of ways of rendering font information, some
> > via Gdk, some via other means entirely such as Cairo.
> >
> > Cairo is a general purpose drawing library that new versions of Gdk use
> > to draw things in windows. Cairo also can interface with a variety of
> > backends, include PostScript, X11, win32, etc etc. In current GTK
> > versions (2.10 etc) when you see a standard office-productivity style
> > application, most of it is being drawn using Cairo to actually control
> > the pixels, Gdk to provide a higher level abstraction of that stuff, and
> > Gtk to provide widgets.
> >
> > --p
>
>     So could you give me an example of gtk+ using indirectly as you say X?
> Would glib-2 be involved?
>
> Bill

    Sorry. You already said glib is for general programming. Alot to take in
at once :) I'm mostly interested myself in window creation and events
relating to that. If gtk+ has it's own would it work without X or is X
needed indirectly?

Bill