[clutter] Subpixel positioning of actors

[Jason Tackaberry]

I understood that it was possible to position actors with subpixel
precision.  I have a texture that I want to move by 0.1f along the x and
y axis every 30ms.  I'm sure the best way to do this would be using a
timeline, but as a test implementation, I just did:

        gboolean slide(gpointer data)
        {
            ClutterActor *tex = data;
            ClutterUnit x, y;
            clutter_actor_get_positionu(tex, &x, &y);
            clutter_actor_set_positionu(tex,
                CLUTTER_UNITS_FROM_FLOAT(CLUTTER_UNITS_TO_FLOAT(x) + 0.1),
                CLUTTER_UNITS_FROM_FLOAT(CLUTTER_UNITS_TO_FLOAT(y) + 0.1));
            printf("Pos: %f, %f\n", CLUTTER_UNITS_TO_FLOAT(x), 
CLUTTER_UNITS_TO_FLOAT(y));
        }
        
        [...]
        g_timeout_add(30, slide, tex);

What actually happens is that although the position outputted is
incrementing by 0.1, the actor itself only actually moves by full
pixels.

Am I missing something?

Thanks,
Jason.

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