>>>> "dv" == Didier Verna
dv> If you're telling us that /regardless/ of the default visual,
dv> XEmacs should use the best one by default, I strongly
dv> disagree. For instance, if you have PseudoColor8 by default
dv> and force XEmacs to use TrueColor24, you'll get colormap
dv> flashing because it needs a different one (remeber there's a
dv> strong relation between the visual you choose and the
dv> colormaps you can use) and user scream :-)
This isn't true in theory; O'Reilly's Xlib Programmer's Guide claims
it wasn't true in practice (even as of the X11R4 edition). A server
can implement multiple hardware colormaps, and there will not
necessarily be any flashing when different window use different
colormaps. (Don't ask me the implementation, I'd just quoting.) A
server can also give you a different visual in each window. Some of
the emulations are trivial (eg PseudoColor8 on a server that supports
PseudoColor16), some impossible (TrueColor24 on 8 bit hardware), of
mb> I don't get flashing when one app is in 8-bit PseudoColor mode
mb> and the other app is in 24-bit TrueColor mode. netscape
mb> simply seems to do The Right Thing. We should too.
My guess is that Xsun is emulating the PseudoColor with the TrueColor.
This is trivial, because you _can't_ have a private colormap with
Truecolor (I think, or is that directcolor?---OReilly's at home). I
don't know that all combinations can be done that effectively though.
dv> On the other hand, you can use the -visual option to change
dv> the default visual. BTW, I'd be curious to see if XEmacs is
dv> clever enough, when given the -visual option, to figure out
dv> whether he needs a private colormap too...
? Those are orthogonal options, aren't they? If the server allows
you to specify a visual, it has to provide a compatible default
colormap. If you decide to downgrade from TrueColor24 to PseudoColor8
(eg, for speed as Kyle mentioned), it would be _really_ obnoxious of
XEmacs to choose between ugly images (noprivate) and distracting
flashing (private) for the user.
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