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(Text Terminal Colors): Document tty-display-color-cells.

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Eli Zaretskii 2002-01-25 13:53:56 +00:00
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12
lispref/frames.texi
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@ -1551,13 +1551,16 @@ and that name is still supported as an alias.
@cindex colors on text-only terminals
Emacs can display color on text-only terminals, starting with version
21. These terminals support only a small number of colors, and the
computer uses small integers to select colors on the terminal. This
21. These terminals usually support only a small number of colors, and
the computer uses small integers to select colors on the terminal. This
means that the computer cannot reliably tell what the selected color
looks like; instead, you have to inform your application which small
integers correspond to which colors. However, Emacs does know the
standard set of colors and will try to use them automatically.
The functions described in this section control how terminal colors
are used by Emacs.
@cindex rgb value
Several of these functions use or return @dfn{rgb values}. An rgb
value is a list of three integers, which give the amount of red, the
@ -1572,6 +1575,11 @@ will specify which terminal to operate on (the default being the
selected frame's terminal; @pxref{Input Focus}). At present, though,
the @var{display} argument has no effect.
@defun tty-display-color-cells &optional display
This function returns the number of distinct colors supported for
@var{display}.
@end defun
@defun tty-color-define name number &optional rgb display
@tindex tty-color-define
This function associates the color name @var{name} with