[cairo] Antialiasing not working with glitz

Charles Tuckey ctuckey at verano.com
Fri Apr 30 13:53:25 PDT 2004

Ok, got it working. None of the cards used OpenGL antialiasing methods 
by default so they had to be turned on.

For the nvidia GeForce2 cards this is done with the environment variable 
__GL_FSAA_MODE = 3 or 4. For the ATI card it is done during setup of the 

Thank you all for your replies; they were informative and educational.


Charles Tuckey wrote:
> I am using the latest cairo (0.1.22), glitz (0.1.0) and libpixman 
> (0.1.1) libraries to display an ellipse on a Linux OS. I noticed that 
> pixman displays the ellipse with antialiasing but that the opengl 
> version does not have antialiasing. My example program is based on the 
> cairogears demo program.
> We have tested this on three different graphics cards running with the 
> latest available drivers:
>   GeForce 2 MX
>   GeForce 2 FX
>   ATI Radeon 9800
> Does anyone have an idea why this might be? I have screenshots if they 
> would help.
> Here is the code I use to create the glitz surface:
>   GtkWidget *window = SWT.Shell.handle;   // pseudo code
>   gtk_widget_set_double_buffered (window, FALSE);
>   GdkDrawable *drawable;
>   gint x_offset, y_offset;
>   gdk_window_get_internal_paint_info (window->window,
>                       &drawable, &x_offset, &y_offset);
>   Display *dpy = GDK_WINDOW_XDISPLAY(drawable);
>   glitz_format_t *format =
>     glitz_glx_find_standard_format (dpy, DefaultScreen (dpy),
>                                     GLITZ_FORMAT_OPTION_ONSCREEN_MASK,
>                                     GLITZ_STANDARD_RGB24);
>   Window win = GDK_WINDOW_XID(window->window);
>   glitz_surface_t *glitz_surface =
>       glitz_glx_surface_create_for_window (dpy, DefaultScreen (dpy),
>                                            format, win);
> thanks,
> charlie
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> cairo at cairographics.org
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Charles Tuckey, MSc.
Software Developer
Verano, Inc.

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