Re: gtk on directfb problem

["Mike Emmel" <mike emmel gmail com>]

Right now the gdk backend is pretty much hard coded to use a ARGB surface
also the directfb Cairo backend does not work well unless the surface
is RGB/ARGB.
For overall performance the current setup is the best one reason its
not been changed.

To really make it work directfb needs something like XRender which can
support cairo
on any surface format. Note Xrender itself is not even close to fully
accelerated.

As far as I know integration of a advanced 2D engine like cairo and
hardware acceleration
is uncommon.  Dennis is looking into it.

Mike


On 5/1/07, Michael Trimarchi <trimarchi gandalf sssup it> wrote:
> Hi,
> I just posted in directfb mailing list without answer :). This is a brief of the problem:
>
> I'm trying to change the colormap only for a widget but I think that
> exists only one surface for rendering.  I don't understand why during
> the inizialization the directfb doesn't create a surface that matches my
> frame buffer setting. Example:
> If I set RGB16 in the directfbrc, I hope that the surface has the same
> mapping. The problem can not be solved by setting to RGB16 because other
> things don't work correctly.
>
>  // window
>   visual = gdk_directfb_visual_by_format (DSPF_RGB16);
>   cmap = gdk_colormap_new (visual, FALSE);
>   gtk_widget_push_colormap (cmap);
>   main_window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
>
> If I set this one my gdk_draw_pixmap is fast, but text and icons have trouble otherwise the application is slow.
> Is there an answer?
>
> Regards Michael
>
> _______________________________________________
> gtk-devel-list mailing list
> gtk-devel-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtk-devel-list