[compiz] GWD button drawing prob-- any Cairo pro have insights?

Gerd Kohlberger lowfi at chello.at
Sat Apr 7 20:48:30 PDT 2007

I think that happens because of how cairo maps coordinates. You have to shift some coordinates by 0.5px
depending on the line width. The first question here explains it better than i can:
http://cairographics.org/FAQ ( btw, i guess i'm a 'pixels are little squares' person :) )

I already had a patch for that somewhere, I'll bring it up to date and post it.

Mike Cook wrote:
> Since I first tried nVidia's AIGLX with Compiz I've been seeing some pretty
> consistent drawing problems on GWD's minimize and maximize buttons on hover.
> It looks like part of the fill is drawn with low alpha.  I haven't been able to
> duplicate it when using Xgl...  Here's a quick vid of what I'm seeing:
> http://s154.photobucket.com/albums/s273/m1kecook/Compiz/?action=view&current=gwd-button-prob.flv
> The following patch seems to work around the problem (but only if I set the
> alpha less than 1.0):
> --- gtk/window-decorator/gtk-window-decorator.c
> +++ gtk/window-decorator/gtk-window-decorator.c
> @@ -943,7 +943,7 @@ button_state_paint (cairo_t   *cr,
>         cairo_stroke_preserve (cr);
>         if (state & IN_EVENT_WINDOW)
> -           cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
> +           cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.99);
>         else
>             cairo_set_source_rgba (cr, color->r, color->g, color->b, 0.95);
> I'm not proficient enough with Cairo to know if this is a bug there, with
> nVidia's driver, or something in GWD or somewhere else.  Anyone have insights?
> ...MC
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