From: Alexander Gramiak <agrambot@gmail.com>
Date: Tue, 2 Apr 2019 17:14:18 +0000 (-0600)
Subject: * lisp/frame.el (display-planes): Use logb over truncate + log
X-Git-Tag: emacs-27.0.90~3261^2~83
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=0c16bb5a39b38c48374bc3ad4ca99208ff329d46;p=emacs.git

* lisp/frame.el (display-planes): Use logb over truncate + log

Suggested by Basil L. Contovounesios:
https://lists.gnu.org/archive/html/bug-gnu-emacs/2019-03/msg01052.html
---

diff --git a/lisp/frame.el b/lisp/frame.el
index aa14e87d7b8..b39891cd142 100644
--- a/lisp/frame.el
+++ b/lisp/frame.el
@@ -2093,7 +2093,7 @@ If DISPLAY is omitted or nil, it defaults to the selected frame's display."
      ((eq frame-type 'pc)
       4)
      (t
-      (truncate (log (length (tty-color-alist)) 2))))))
+      (logb (length (tty-color-alist)))))))
 
 (declare-function x-display-color-cells "xfns.c" (&optional terminal))