Move color.el out of the gnus/ tree.

1 files changed, 0 insertions, 269 deletions

diff --git a/lisp/gnus/color.el b/lisp/gnus/color.el
deleted file mode 100644
index 07044333c4b..00000000000
--- a/lisp/gnus/color.el
+++ /dev/null
@@ -1,269 +0,0 @@
-;;; color.el --- Color manipulation laboratory routines -*- coding: utf-8; -*-
-
-;; Copyright (C) 2010 Free Software Foundation, Inc.
-
-;; Author: Julien Danjou <julien@danjou.info>
-;; Keywords: html
-
-;; This file is part of GNU Emacs.
-
-;; GNU Emacs is free software: you can redistribute it and/or modify
-;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation, either version 3 of the License, or
-;; (at your option) any later version.
-
-;; GNU Emacs is distributed in the hope that it will be useful,
-;; but WITHOUT ANY WARRANTY; without even the implied warranty of
-;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-;; GNU General Public License for more details.
-
-;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
-
-;;; Commentary:
-
-;; This package provides color manipulation functions.
-
-;;; Code:
-
-(eval-when-compile
-  (require 'cl))
-
-;; Emacs < 23.3
-(eval-and-compile
-  (unless (boundp 'float-pi)
-    (defconst float-pi (* 4 (atan 1)) "The value of Pi (3.1415926...).")))
-
-(defun color-rgb->hex  (red green blue)
-  "Return hexadecimal notation for RED GREEN BLUE color.
-RED GREEN BLUE must be values between 0 and 1 inclusively."
-  (format "#%02x%02x%02x"
-          (* red 255) (* green 255) (* blue 255)))
-
-(defun color-complement (color)
-  "Return the color that is the complement of COLOR."
-  (let ((color (color-rgb->normalize color)))
-    (list (- 1.0 (car color))
-          (- 1.0 (cadr color))
-          (- 1.0 (caddr color)))))
-
-(defun color-complement-hex (color)
-  "Return the color that is the complement of COLOR, in hexadecimal format."
-  (apply 'color-rgb->hex (color-complement color)))
-
-(defun color-rgb->hsv (red green blue)
-  "Convert RED GREEN BLUE values to HSV representation.
-Hue is in radians. Saturation and values are between 0 and 1
-inclusively."
-   (let* ((r (float red))
-	 (g (float green))
-	 (b (float blue))
-	 (max (max r g b))
-	 (min (min r g b)))
-     (list
-      (/ (* 2 float-pi
-            (cond ((and (= r g) (= g b)) 0)
-                  ((and (= r max)
-                        (>= g b))
-                   (* 60 (/ (- g b) (- max min))))
-                  ((and (= r max)
-                        (< g b))
-                   (+ 360 (* 60 (/ (- g b) (- max min)))))
-                  ((= max g)
-                   (+ 120 (* 60 (/ (- b r) (- max min)))))
-                  ((= max b)
-                       (+ 240 (* 60 (/ (- r g) (- max min)))))))
-         360)
-      (if (= max 0)
-          0
-        (- 1 (/ min max)))
-      (/ max 255.0))))
-
-(defun color-rgb->hsl (red green blue)
-  "Convert RED GREEN BLUE colors to their HSL representation.
-RED, GREEN and BLUE must be between 0 and 1 inclusively."
-  (let* ((r red)
-         (g green)
-         (b blue)
-         (max (max r g b))
-         (min (min r g b))
-         (delta (- max min))
-         (l (/ (+ max min) 2.0)))
-    (list
-     (if (= max min)
-         0
-       (* 2 float-pi
-          (/ (cond ((= max r)
-                    (+ (/ (- g b) delta) (if (< g b) 6 0)))
-                   ((= max g)
-                 (+ (/ (- b r) delta) 2))
-                   (t
-                    (+ (/ (- r g) delta) 4)))
-             6)))
-     (if (= max min)
-         0
-       (if (> l 0.5)
-           (/ delta (- 2 (+ max min)))
-         (/ delta (+ max min))))
-     l)))
-
-(defun color-srgb->xyz (red green blue)
-  "Converts RED GREEN BLUE colors from the sRGB color space to CIE XYZ.
-RED, BLUE and GREEN must be between 0 and 1 inclusively."
-  (let ((r (if (<= red 0.04045)
-               (/ red 12.95)
-             (expt (/ (+ red 0.055) 1.055) 2.4)))
-        (g (if (<= green 0.04045)
-               (/ green 12.95)
-             (expt (/ (+ green 0.055) 1.055) 2.4)))
-        (b (if (<= blue 0.04045)
-               (/ blue 12.95)
-             (expt (/ (+ blue 0.055) 1.055) 2.4))))
-    (list (+ (* 0.4124564 r) (* 0.3575761 g) (* 0.1804375 b))
-          (+ (* 0.21266729 r) (* 0.7151522 g) (* 0.0721750 b))
-          (+ (* 0.0193339 r) (* 0.1191920 g) (* 0.9503041 b)))))
-
-(defun color-xyz->srgb (X Y Z)
-  "Converts CIE X Y Z colors to sRGB color space."
-  (let ((r (+ (* 3.2404542 X) (* -1.5371385 Y) (* -0.4985314 Z)))
-        (g (+ (* -0.9692660 X) (* 1.8760108 Y) (* 0.0415560 Z)))
-        (b (+ (* 0.0556434 X) (* -0.2040259 Y) (* 1.0572252 Z))))
-    (list (if (<= r 0.0031308)
-              (* 12.92 r)
-            (- (* 1.055 (expt r (/ 1 2.4))) 0.055))
-          (if (<= g 0.0031308)
-              (* 12.92 g)
-            (- (* 1.055 (expt g (/ 1 2.4))) 0.055))
-          (if (<= b 0.0031308)
-              (* 12.92 b)
-            (- (* 1.055 (expt b (/ 1 2.4))) 0.055)))))
-
-(defconst color-d65-xyz '(0.950455 1.0 1.088753)
-  "D65 white point in CIE XYZ.")
-
-(defconst color-cie-ε (/ 216 24389.0))
-(defconst color-cie-κ (/ 24389 27.0))
-
-(defun color-xyz->lab (X Y Z &optional white-point)
-  "Converts CIE XYZ to CIE L*a*b*.
-WHITE-POINT can be specified as (X Y Z) white point to use. If
-none is set, `color-d65-xyz' is used."
-  (destructuring-bind (Xr Yr Zr) (or white-point color-d65-xyz)
-      (let* ((xr (/ X Xr))
-             (yr (/ Y Yr))
-             (zr (/ Z Zr))
-             (fx (if (> xr color-cie-ε)
-                     (expt xr (/ 1 3.0))
-                   (/ (+ (* color-cie-κ xr) 16) 116.0)))
-             (fy (if (> yr color-cie-ε)
-                     (expt yr (/ 1 3.0))
-                   (/ (+ (* color-cie-κ yr) 16) 116.0)))
-             (fz (if (> zr color-cie-ε)
-                     (expt zr (/ 1 3.0))
-                   (/ (+ (* color-cie-κ zr) 16) 116.0))))
-        (list
-         (- (* 116 fy) 16)                  ; L
-         (* 500 (- fx fy))                  ; a
-         (* 200 (- fy fz))))))              ; b
-
-(defun color-lab->xyz (L a b &optional white-point)
-  "Converts CIE L*a*b* to CIE XYZ.
-WHITE-POINT can be specified as (X Y Z) white point to use. If
-none is set, `color-d65-xyz' is used."
-  (destructuring-bind (Xr Yr Zr) (or white-point color-d65-xyz)
-      (let* ((fy (/ (+ L 16) 116.0))
-             (fz (- fy (/ b 200.0)))
-             (fx (+ (/ a 500.0) fy))
-             (xr (if (> (expt fx 3.0) color-cie-ε)
-                     (expt fx 3.0)
-               (/ (- (* fx 116) 16) color-cie-κ)))
-             (yr (if (> L (* color-cie-κ color-cie-ε))
-                     (expt (/ (+ L 16) 116.0) 3.0)
-                   (/ L color-cie-κ)))
-             (zr (if (> (expt fz 3) color-cie-ε)
-                     (expt fz 3.0)
-                   (/ (- (* 116 fz) 16) color-cie-κ))))
-        (list (* xr Xr)                 ; X
-              (* yr Yr)                 ; Y
-              (* zr Zr)))))             ; Z
-
-(defun color-srgb->lab (red green blue)
-  "Converts RGB to CIE L*a*b*."
-  (apply 'color-xyz->lab (color-srgb->xyz red green blue)))
-
-(defun color-rgb->normalize (color)
-  "Normalize a RGB color to values between 0 and 1 inclusively."
-  (mapcar (lambda (x) (/ x 65535.0)) (x-color-values color)))
-
-(defun color-lab->srgb (L a b)
-  "Converts CIE L*a*b* to RGB."
-  (apply 'color-xyz->srgb (color-lab->xyz L a b)))
-
-(defun color-cie-de2000 (color1 color2 &optional kL kC kH)
-  "Computes the CIEDE2000 color distance between COLOR1 and COLOR2.
-Colors must be in CIE L*a*b* format."
-  (destructuring-bind (L₁ a₁ b₁) color1
-    (destructuring-bind (L₂ a₂ b₂) color2
-      (let* ((kL (or kL 1))
-             (kC (or kC 1))
-             (kH (or kH 1))
-             (C₁ (sqrt (+ (expt a₁ 2.0) (expt b₁ 2.0))))
-             (C₂ (sqrt (+ (expt a₂ 2.0) (expt b₂ 2.0))))
-             (C̄ (/ (+ C₁ C₂) 2.0))
-             (G (* 0.5 (- 1 (sqrt (/ (expt C̄ 7.0) (+ (expt C̄ 7.0) (expt 25 7.0)))))))
-             (a′₁ (* (+ 1 G) a₁))
-             (a′₂ (* (+ 1 G) a₂))
-             (C′₁ (sqrt (+ (expt a′₁ 2.0) (expt b₁ 2.0))))
-             (C′₂ (sqrt (+ (expt a′₂ 2.0) (expt b₂ 2.0))))
-             (h′₁ (if (and (= b₁ 0) (= a′₁ 0))
-                      0
-                    (let ((v (atan b₁ a′₁)))
-                      (if (< v 0)
-                          (+ v (* 2 float-pi))
-                        v))))
-             (h′₂ (if (and (= b₂ 0) (= a′₂ 0))
-                      0
-                    (let ((v (atan b₂ a′₂)))
-                      (if (< v 0)
-                          (+ v (* 2 float-pi))
-                        v))))
-             (ΔL′ (- L₂ L₁))
-             (ΔC′ (- C′₂ C′₁))
-             (Δh′ (cond ((= (* C′₁ C′₂) 0)
-                         0)
-                        ((<= (abs (- h′₂ h′₁)) float-pi)
-                         (- h′₂ h′₁))
-                        ((> (- h′₂ h′₁) float-pi)
-                         (- (- h′₂ h′₁) (* 2 float-pi)))
-                        ((< (- h′₂ h′₁) (- float-pi))
-                         (+ (- h′₂ h′₁) (* 2 float-pi)))))
-             (ΔH′ (* 2 (sqrt (* C′₁ C′₂)) (sin (/ Δh′ 2.0))))
-             (L̄′ (/ (+ L₁ L₂) 2.0))
-             (C̄′ (/ (+ C′₁ C′₂) 2.0))
-             (h̄′ (cond ((= (* C′₁ C′₂) 0)
-                        (+ h′₁ h′₂))
-                       ((<= (abs (- h′₁ h′₂)) float-pi)
-                        (/ (+ h′₁ h′₂) 2.0))
-                       ((< (+ h′₁ h′₂) (* 2 float-pi))
-                        (/ (+ h′₁ h′₂ (* 2 float-pi)) 2.0))
-                       ((>= (+ h′₁ h′₂) (* 2 float-pi))
-                        (/ (+ h′₁ h′₂ (* -2 float-pi)) 2.0))))
-             (T (+ 1
-                   (- (* 0.17 (cos (- h̄′ (degrees-to-radians 30)))))
-                   (* 0.24 (cos (* h̄′ 2)))
-                   (* 0.32 (cos (+ (* h̄′ 3) (degrees-to-radians 6))))
-                   (- (* 0.20 (cos (- (* h̄′ 4) (degrees-to-radians 63)))))))
-             (Δθ (* (degrees-to-radians 30) (exp (- (expt (/ (- h̄′ (degrees-to-radians 275)) (degrees-to-radians 25)) 2.0)))))
-             (Rc (* 2 (sqrt (/ (expt C̄′ 7.0) (+ (expt C̄′ 7.0) (expt 25.0 7.0))))))
-             (Sl (+ 1 (/ (* 0.015 (expt (- L̄′ 50) 2.0)) (sqrt (+ 20 (expt (- L̄′ 50) 2.0))))))
-             (Sc (+ 1 (* C̄′ 0.045)))
-             (Sh (+ 1 (* 0.015 C̄′ T)))
-             (Rt (- (* (sin (* Δθ 2)) Rc))))
-        (sqrt (+ (expt (/ ΔL′ (* Sl kL)) 2.0)
-                 (expt (/ ΔC′ (* Sc kC)) 2.0)
-                 (expt (/ ΔH′ (* Sh kH)) 2.0)
-                 (* Rt (/ ΔC′ (* Sc kC)) (/ ΔH′ (* Sh kH)))))))))
-
-(provide 'color)
-
-;;; color.el ends here