Re: Font-lock.el uses strange value for min-colors (Was x-display-color-cells returns wrong number)

[Jan D.]

> > A better way to find out the number of colors that can be displayed
> > at the same time is (1 << DisplayPlanes(...)).  There is no need to
> > distinguish between visual types if number of colors is calculated 
> > this
> > way.
>
> I don't know enough about X to even parse the last sentence, but I do
> think display-color-cells should return the number of distinct colors
> Emacs can use.  It sounds like display-color-cells does that on every
> platform except X (MS-Windows, MS-DOS, Unix tty, don't know about the
> Mac).  That function is advertised as one that returns the number of
> distinct colors, so IMHO it had better do what we say it does.

The number of planes it the same as the number of bits in a pixel,
i.e. 8 for 256 color displays, 16 for 65536 colors, and so on.

So on X the number of colors Emacs can use are
  (ash 1 (x-display-planes))

I can do the change, but I don't know if x-display-color-cells or
display-color-cells should change yet.  I'll have to check where
else x-display-color-cells is used.  I will do it within a day or so.

        Jan D.