Just want to report the results of running the included example.c benchmark on 7 different machines:
ATI w/open source driver - no speedup Nvidia w/open source driver - no speedup Old Nvidia FX5200 w/closed source driver - 5X speedup New Nvidia w/closed source driver - 10X speedup I did not try it with Intel graphics hardware. Conclusion: self implemented GdkPixmap helps only when the X server can use certain optimizations from the graphics card. On Wed, Jan 27, 2010 at 9:12 PM, Robert Gibbs <[email protected]> wrote: > 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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