On Tue, 11 Dec 2001, Jonathan Walther wrote:
> Thank you Mark. Your description was just what the doctor ordered. I
> can get rid of clip masks entirely now, and a bunch of other
> extraneous operations.
Actually, if the arrow is simple, the fastest way to draw
it would be with a rectangle and a polygon (triangle). That
would be faster than an arrow shaped stipple.
>
> Thanks to your description, I don't need to know the following
> information now, but its been bugging the heck out of me:
> how did Keith Packard make his twn menu-windows translucent?
> Are there docs somewhere that should make this obvious to me, which I
> haven't found yet? On the Render list archives I saw someone saying
> explicitly "this stuff ISN'T documented anywhere..."
You mean in the pictures from his talk? I believe that was
a hack to the X-server he did as a proof of concept. The
Render extension was a skeleton back then. Though I suppose
you could do it by putting up a window without a background
and then rendering into it with with Render. When you
unmapped the popup window things would get cleaned up properly.
Mark.
>
> Jonathan
>
> On Tue, Dec 11, 2001 at 01:14:24PM -0800, Mark Vojkovich wrote:
> > Changing the GC clip mask is a very slow operation and using
> >GC clip masks should be avoided in performance paths.
> >
> > Render everything into a pixmap, set it as the window background
> >and call XClearArea on the window areas you need updated.
> >Note that if you've changed the pixmap contents you need to
> >reset it as the window background because the protocol doesn't
> >guarantee that the new contents will go into effect without that.
> >Note that the pixmap doesn't get damaged when the window does
> >and the window will automatically get repainted from the background
> >pixmap on exposures so you don't need to handle expose events anymore.
> >
> > If the arrow is monochrome, the fastest way to render it is with
> >a stippled fill using a monochrome bitmap with the shape of the
> >arrow in it.
> >
> >Copy large drawable to 400x400 pixmap (single rectangle)
> >render arrow (single stippled rectangle, note that you'll have
> > to use XSetTSOrigin to have it match the arrow location since
> > GC stipples are drawable aligned).
> >set pixmap as window background
> >XClearArea
> >
> > Do nothing at all for exposures.
>
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