On Mon, 24 Sep 2001, Eric Faurot wrote:
> > The problem centers around the fact that when you are using an
> > in-pixel alpha value, ggiUnmapPixel/ggiMapColor can use the
> > color.a field, whereas when you are using a side-buffer, there is
> > no guarantee that you will be able to stuff the color.a field into the
> > pixel. I thought about changing the pixelformat when the alpha
> > buffer is added to a pixelformat that has an alpha channel, but that
> > strikes me as messy and it would break when the total exceeded 32 bits.
>
> Why couldn't you get the .a with a side buffer?
You can set .a, but not the other way -- you cannot pack .a into
a 24-bit r8g8b8 pixel, for example.
> Anyway I caught a bad cold while trekking in the rain and part of my
> brain is vegetating right now. So I might have missed something.
Yes, I figured out the way to go, and have updated LibBuf docs to reflect.
BTW, I am starting on LibBlt right now, and so LibBuf is safe to hack
on for the moment if anyone is inclined. I left a long TODO list in there.
--
Brian
