From: Julien Danjou <julien@danjou.info>
Date: Thu, 19 Jan 2012 23:06:49 +0000 (+0000)
Subject: color.el (color-name-to-rgb): Use the white color to find the max color component... 
X-Git-Url: http://git.hcoop.net/bpt/emacs.git/commitdiff_plain/0d0deb382bfc139f4c30f1f17ef1ab410ff94836

color.el (color-name-to-rgb): Use the white color to find the max color component value and return correctly computed values.
 (color-name-to-rgb): Add missing float conversion for max value.
---

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 8fa8031d12..ab813e2192 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,9 @@
+2012-01-19  Julien Danjou  <julien@danjou.info>
+
+	* color.el (color-name-to-rgb): Use the white color to find the max
+	color component value and return correctly computed values.
+	(color-name-to-rgb): Add missing float conversion for max value.
+
 2012-01-19  Martin Rudalics  <rudalics@gmx.at>
 
 	* window.el (window--state-get-1, window-state-get): Do not use
diff --git a/lisp/color.el b/lisp/color.el
index ff7f0eee4e..6fab613ba6 100644
--- a/lisp/color.el
+++ b/lisp/color.el
@@ -53,7 +53,10 @@ numbers, (RED GREEN BLUE), each between 0.0 and 1.0 inclusive.
 Optional arg FRAME specifies the frame where the color is to be
 displayed.  If FRAME is omitted or nil, use the selected frame.
 If FRAME cannot display COLOR, return nil."
-  (mapcar (lambda (x) (/ x 65535.0)) (color-values color frame)))
+  ;; `colors-values' maximum value is either 65535 or 65280 depending on the
+  ;; display system. So we use a white conversion to get the max value.
+  (let ((valmax (float (car (color-values "#ffffff")))))
+    (mapcar (lambda (x) (/ x valmax)) (color-values color frame))))
 
 (defun color-rgb-to-hex  (red green blue)
   "Return hexadecimal notation for the color RED GREEN BLUE.