Re: [9fans] vncv sw cursor trail

[erik quanstrom <quanstro@quanstro.net>]

> i think the assertion that memload "loads directly to the screen" is not correct.
> at least to my walking through memload.

i read wrong.  i think this may fix the issue in a systemic, but not
entirely satisfying way.  it does seem rather optimistic that we can
just scribble on the screen.

    Top:
	dl = dst->layer;
	if(dl == nil){
		/* call memdraw so that hwdraw gets called */
		tmp = allocmemimage(r, dst->chan);
		n = loadfn(tmp, r, data, n);
		memdraw(dst, r, tmp, r.min, nil, r.min, S);
		freememimage(tmp);
		return n;
	}

by the way, hz should have nothing to do with it since i'm
using cinap's technique of a mouse process that redraws the
cursor when asked, or every 20ms, whichever comes first.

- erik