GNU bug report logs -
#12559
color-hsl-to-rgb doesn't handle hue range overflow
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Reported by: Julian Scheid <julians37 <at> gmail.com>
Date: Tue, 2 Oct 2012 16:27:04 UTC
Severity: normal
Tags: patch
Merged with 13047
Found in version 24.2
Fixed in version 24.3
Done: Glenn Morris <rgm <at> gnu.org>
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bug#12559
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(Tue, 02 Oct 2012 16:27:04 GMT)
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bug-gnu-emacs <at> gnu.org
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(Tue, 02 Oct 2012 16:27:05 GMT)
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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
`color-hsl-to-rgb' manipulates hue without dealing with range overflow
or underflow. This takes small and large hue values outside of the
range expected by `color-hue-to-rgb' and causes incorrect results for
such values:
(color-rgb-to-hsl 0.65 0.25 0.75)
;; -> (0.7999999999999999 0.5 0.5)
(apply 'color-hsl-to-rgb (color-rgb-to-hsl 0.65 0.25 0.75))
;; -> (0.25 0.25 0.75)
(color-rgb-to-hsl 0.65 0.75 0.25)
;; -> (0.20000000000000004 0.5 0.5)
(apply 'color-hsl-to-rgb (color-rgb-to-hsl 0.65 0.75 0.25))
;; -> (0.6499999999999999 0.75 -0.1499999999999998)
The patch below makes the conversion work as expected:
(apply 'color-hsl-to-rgb (color-rgb-to-hsl 0.65 0.25 0.75))
;; -> (0.6499999999999999 0.25 0.75)
(apply 'color-hsl-to-rgb (color-rgb-to-hsl 0.65 0.75 0.25))
;; -> (0.6499999999999999 0.75 0.25)
2012-10-02 Julian Scheid <julians37 <at> gmail.com>
* color.el (color-hsl-to-rgb): Fix for incorrect results for
small and large hue values.
=== modified file 'lisp/color.el'
*** lisp/color.el 2012-08-13 19:10:35 +0000
--- lisp/color.el 2012-10-02 13:16:32 +0000
*************** Return a list (RED, GREEN, BLUE) which e
*** 116,124 ****
(- (+ L S) (* L S))))
(m1 (- (* 2.0 L) m2)))
(list
! (color-hue-to-rgb m1 m2 (+ H (/ 1.0 3)))
(color-hue-to-rgb m1 m2 H)
! (color-hue-to-rgb m1 m2 (- H (/ 1.0 3)))))))
(defun color-complement-hex (color)
"Return the color that is the complement of COLOR, in hexadecimal format."
--- 116,124 ----
(- (+ L S) (* L S))))
(m1 (- (* 2.0 L) m2)))
(list
! (color-hue-to-rgb m1 m2 (mod (+ H (/ 1.0 3)) 1))
(color-hue-to-rgb m1 m2 H)
! (color-hue-to-rgb m1 m2 (mod (- H (/ 1.0 3)) 1))))))
(defun color-complement-hex (color)
"Return the color that is the complement of COLOR, in hexadecimal format."
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Glenn Morris <rgm <at> gnu.org>
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You have taken responsibility.
(Sat, 06 Oct 2012 02:23:02 GMT)
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Julian Scheid <julians37 <at> gmail.com>
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bug acknowledged by developer.
(Sat, 06 Oct 2012 02:23:03 GMT)
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Message #10 received at 12559-done <at> debbugs.gnu.org (full text, mbox):
Version: 24.3
Thanks; applied to trunk.
bug archived.
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internal_control <at> debbugs.gnu.org
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(Sat, 03 Nov 2012 11:24:03 GMT)
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bug unarchived.
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(Sat, 01 Dec 2012 18:42:02 GMT)
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Forcibly Merged 12559 13047.
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control <at> debbugs.gnu.org
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(Sat, 01 Dec 2012 18:42:02 GMT)
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bug archived.
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(Sun, 30 Dec 2012 12:24:03 GMT)
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This bug report was last modified 11 years and 131 days ago.
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