(This has nothing to do with video overlays or the XVideo extension).
The chips, glint and mga drivers support overlay visuals;
the chips 8bit over 16, and the other two 8bit over 24.
On 27 April 1999 the options to enable these were changed
to standardize the name ("OVERLAY"), and switched from
booleans to strings "8,16"/"16,8" or "8,24"/"24,8"
(as appropriate for each driver).
This also allowed
Option "OVERLAY"
with no string, but not
Option "OVERLAY" ""
(empty string) to enable overlays.
This has proved confusing to document (see bug 22).
Was the intention that "8,24" and "24,8" would
select different default (root window) visuals ?
At first glance it would seem sensible to make the drivers do that
(checking for conflicts with the "Visual" keyword, and command line
option -cc), but in practice broken apps mean that most people using
overlays have to use them with the 8bit visual as the default.
Therefore it seems sensible to allow a form of the option which
means "turn it on and do the obvious thing" rather than force th user to
select which way round to put the visuals.
Personally I'd like to revert to a boolean which turns overlays on,
defaulting to the 8bit visual as default.
Anyone who anyone desires a different root window visual should use
the "Visual" keyword, or the "-cc" command line option.
--
Andrew C. Aitchison Cambridge
[EMAIL PROTECTED]
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