Re: Why floating point for widget positions

[Mike Emmel <mike emmel gmail com>]

On Wed, 23 Mar 2005 09:58:46 +0200, Olexiy Avramchenko
<olexiy ctech cn ua> wrote:
> Tristan Van Berkom wrote:
> > Mike Emmel wrote:
> >
> >> I've noticed that the GdkEventMotion x y positions are given in
> >> floating point coordinates and was wondering why ?
> >
> > I'd assume that this is just because xlib delivers the value
> > as `double'.
> Nope, they're defined as integers by Xlib interface (at least for X11R6.4). I
> don't know the why GDK uses floating point there, but I'll not be surprised if
> it smth ~= "historical reasons".
> Maybe this question is for gtk-devel list ?
> 
> >> I've looking at GTK for embedded use and this is and issue.
> >
> > How is floating point coordinates a problem ?
> That becomes a problem when 450MIPS CPU can provide <= 2MFLOPS.
> 
> Some time ago I was thinking about to run GTK2 on embedded device (without FPU
> also). Project was freezed at the point when I started to look for alternative
> toolkit.
> 
>         Olexiy
> 
> 

Even with all of its warts GTK could be a decent embedded toolkit I've
decided to adopt it for embedded use or at least as the starting point
for a embedded toolkit.  I want to base it off the 2.8 release later
this summer I'll post to the list once I have it "together".  I have
no plans to maintian perfect compatibility with the desktop version
but want to keep the changes resonable i.e. no uneeded floating point
reduced widget set etc.

One of the biggest changes I have in mind is rewriting GObject to use
libffi and simplifying the constructor chain. Anyone who is intrested
in embedded GTK or  doing a serious rewrite of GObject using libffi
and simplification of the constructors please email me. If there is
enough intrest we could start the project now.

Mike