Commit c527e600 authored by Eli Zaretskii's avatar Eli Zaretskii
Browse files

(tty-color-gray-shades): New function.

parent 25660570
......@@ -956,3 +956,22 @@ NAME is not necessarily the same string as the argument COLOR, because
the latter might need to be approximated if it is not supported directly."
(let ((idx (tty-color-translate color frame)))
(tty-color-by-index idx frame)))
(defun tty-color-gray-shades (&optional display)
"Return the number of gray colors supported by DISPLAY's terminal.
A color is considered gray if the 3 components of its RGB value are equal."
(let* ((frame (if (framep display) display
;; FIXME: this uses an arbitrary frame from DISPLAY!
(car (frames-on-display-list display))))
(colors (tty-color-alist frame))
(count 0)
desc r g b)
(while colors
(setq desc (cddr (car colors))
r (car desc)
g (cadr desc)
b (car (cddr desc)))
(and (eq r g) (eq g b)
(setq count (1+ count)))
(setq colors (cdr colors)))
count))
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