Re: performance problems double buffering to 1600x1200 window

[Clemens Eisserer <linuxhippy gmail com>]

I wrote some patches to improve that insane double-buffer
implementation, but it was rejected.
In fact ... nobody really looked at it as far as I can remember.

- Clemens

2010/1/27 Robert Gibbs <gibbsrc gmail com>:
> I am running into a severe performance degradation when using the built in
> GtkDrawingArea double buffering to a 1600x1200 window.  The program sets a
> default priority idle handler which calls gtk_widget_queue_draw.  The expose
> event originally would draw about 1000 polygons, but I commented out the
> drawing portion and still saw the same poor performance.  The best
> performance I can get is about 10 frames per second.
>
> If call GTK_WIDGET_UNSET_FLAGS (drawing_area, GTK_DOUBLE_BUFFERED), then use
> my own pixmap for double buffering, the performance goes up to 50 frames per
> second.
>
> Can anyone tell me why the built-in double buffering would yield such poor
> performance?
>
>
>
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