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(msdos-approximate-color): New function.

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(msdos-color-translate): Call it to find a DOS color that best
approximates an X-style "#NNNNNN" color specification.
This commit is contained in:
Eli Zaretskii 1999-02-01 13:25:12 +00:00
parent f670496a30
commit a13b5fad5d
1 changed files with 28 additions and 1 deletions
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29
lisp/term/pc-win.el
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@ -175,6 +175,7 @@
"List of alternate names for colors.")
(defun msdos-color-translate (name)
"Translate color specification in NAME into something DOS terminal groks."
(setq name (downcase name))
(let* ((len (length name))
(val (- (length x-colors)
@ -232,7 +233,33 @@
(and
(string-match "[1-4]\\'" name)
(msdos-color-translate
(substring name 0 (match-beginning 0)))))))))
(substring name 0 (match-beginning 0))))))
(and (= len 7) ;; X-style "#XXYYZZ" color spec
(eq (aref name 0) ?#)
(member (aref name 1)
'(?0 ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 ?9
?A ?B ?C ?D ?E ?F ?a ?b ?c ?d ?e ?f))
(msdos-color-translate
(msdos-approximate-color (string-to-number
(substring name 1) 16)))))))
(defun msdos-approximate-color (num)
"Return a DOS color name which is the best approximation for the number NUM."
(let ((color-values msdos-color-values)
(candidate (car msdos-color-values))
(best-distance 16777216) ;; 0xFFFFFF + 1
best-color)
(while candidate
(let* ((values (cdr candidate))
(value (+ (lsh (car values) 16)
(lsh (car (cdr values)) 8)
(nth 2 values))))
(if (< (abs (- value num)) best-distance)
(setq best-distance (abs (- value num))
best-color (car candidate))))
(setq color-values (cdr color-values))
(setq candidate (car color-values)))
best-color))
;; ---------------------------------------------------------------------------
;; We want to delay setting frame parameters until the faces are setup
(defvar default-frame-alist nil)