[gcompris-devel] Re: refresh bug in the canvas

[Marius Andreiana]

Too much work. The only reason to change it's the gnomecanvas bug, but
Olivier's patch fixes it completly, right?

I also don't agree dropping gnome dependency (and future advantages -
gconf, sessions ) so gcompris can be ported to MS Windows.

On Ma, 2003-05-20 at 01:36, Bruno Coudoin wrote:
> I made the test. It is relatively easy to port gcompris to the foo
> canvas. I have it running here by replacing all gnome_canvas to
> foo_canvas and GnomeCanvas to FooCanvas plus the init of foo canvas libs
> and cflags in the configure and we are done.
> It is true that its much more faster than the gnomecanvas. Another
> benefit is that we gain transparency (nice looking).
> The drawback is that we loose some feature and some boards would need
> some reworks:
> - submarine uses the affine transform that does not exist in foocanvas
> - python that rely on the gnomecanvas.
> - several bugs appears all over the places, can't resize in draw,
> keyboard entry fails in some boards, cars puzzle fails completly.
> 
> I don't believe it's good for us to follow that path. Too much work for
> me.
> 
> Another point we got from Jody is that it should be possible to move to
> gtk only and thus to gain the possibility to cross compile gcompris for
> windows. I am personnality not a fan of this operating system and won't
> do it myself. Now if somebody sees a benefit in this, the position is
> open.
> 
> Bruno.
> 
> 
> 
> 
> Le lun 19/05/2003 à 21:15, Jody Goldberg a écrit :
> > On Mon, May 19, 2003 at 08:52:19PM +0200, Bruno Coudoin wrote:
> > > 
> > > 
> > > Does that means also that it doesn't need gnome. 
> > It only depends on gtk.
> > 
> > > Going that path, I could port gcompris to gtk since I use only the
> > > canvas, and provide a windows version ?
> > 
> > gnome-canvas' requirements are also only basic gtk + libart, nothing
> > in the bonobo/gnome layers.  So that is not really a deciding
> > factor.
> > 
> > > Le lun 19/05/2003 ? 19:12, Alexander Larsson a ?crit :
> > > > On Mon, 2003-05-19 at 15:01, Bruno Coudoin wrote:
> > > > > I am the author of gcompris and I suffer badly from a refresh bug in the
> > > > > canvas.
> > > > > http://bugzilla.gnome.org/show_bug.cgi?id=91583
> > > > > I checked the CVS today and it's still there.
> > > > > 
> > > > > The easiest way to show evidence of the bug is the fifteen game demo in
> > > > > libgnomecanvas/demos/canvas_demo the pieces are not refreshed after the
> > > > > move (you move the window out of the desktop area and bring it back and
> > > > > you see the moved items)
> > > > > 
> > > > > We added a bunch of gnome_canvas_update in gcompris as a workaround and
> > > > > it's better now.
> > > > > 
> > > > > I don't know if gcompris is the only app to suffer this but my users are
> > > > > disapointed :(
> > > > > 
> > > > > Do you know if somebody familiar with the libgnomecanvas code is aware
> > > > > or working on this ? If not, where should I look ?
> > > > 
> > > > If you don't use the anti-aliased mode of the canvas you might want to
> > > > try out the foocanvas module. It has a simplified non-aa canvas that
> > > > performs better, redraws bettter and integrates better with gtk2.
> > > > Applications like nautilus and gnumeric use it.
> > 
> > 
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> 
> 
> 
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-- 
Marius Andreiana
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