-;;; color.el --- Color manipulation library -*- coding: utf-8; -*-
+;;; color.el --- Color manipulation library -*- coding: utf-8; lexical-binding:t -*-
-;; Copyright (C) 2010-2012 Free Software Foundation, Inc.
+;; Copyright (C) 2010-2014 Free Software Foundation, Inc.
;; Authors: Julien Danjou <julien@danjou.info>
;; Drew Adams <drew.adams@oracle.com>
;;; Code:
-(eval-when-compile
- (require 'cl))
-
;; Emacs < 23.3
(eval-and-compile
(unless (boundp 'float-pi)
Normally the return value is a list of three floating-point
numbers, (RED GREEN BLUE), each between 0.0 and 1.0 inclusive.
-Optional arg FRAME specifies the frame where the color is to be
+Optional argument 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."
;; `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.
+ ;; 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.
-RED GREEN BLUE must be numbers between 0.0 and 1.0 inclusive."
+RED, GREEN, and BLUE should be numbers between 0.0 and 1.0, inclusive."
(format "#%02x%02x%02x"
(* red 255) (* green 255) (* blue 255)))
COLOR-NAME should be a string naming a color (e.g. \"white\"), or
a string specifying a color's RGB components (e.g. \"#ff12ec\")."
(let ((color (color-name-to-rgb color-name)))
- (list (- 1.0 (car color))
- (- 1.0 (cadr color))
- (- 1.0 (caddr color)))))
+ (list (- 1.0 (nth 0 color))
+ (- 1.0 (nth 1 color))
+ (- 1.0 (nth 2 color)))))
(defun color-gradient (start stop step-number)
"Return a list with STEP-NUMBER colors from START to STOP.
The color list builds a color gradient starting at color START to
-color STOP. It does not include the START and STOP color in the
+color STOP. It does not include the START and STOP color in the
resulting list."
(let* ((r (nth 0 start))
(g (nth 1 start))
(g-step (/ (- (nth 1 stop) g) (1+ step-number)))
(b-step (/ (- (nth 2 stop) b) (1+ step-number)))
result)
- (dotimes (n step-number)
+ (dotimes (_ step-number)
(push (list (setq r (+ r r-step))
(setq g (+ g g-step))
(setq b (+ b b-step)))
(nreverse result)))
(defun color-hue-to-rgb (v1 v2 h)
- "Compute hue from V1 and V2 H. Internally used by
-`color-hsl-to-rgb'."
+ "Compute hue from V1 and V2 H.
+Used internally by `color-hsl-to-rgb'."
(cond
((< h (/ 1.0 6)) (+ v1 (* (- v2 v1) h 6.0)))
((< h 0.5) v2)
(t v1)))
(defun color-hsl-to-rgb (H S L)
- "Convert H S L (HUE, SATURATION, LUMINANCE) , where HUE is in
-radians and both SATURATION and LUMINANCE are between 0.0 and
-1.0, inclusive to their RGB representation.
-
-Return a list (RED, GREEN, BLUE) which each be numbers between
-0.0 and 1.0, inclusive."
-
+ "Convert hue, saturation and luminance to their RGB representation.
+H, S, and L should each be numbers between 0.0 and 1.0, inclusive.
+Return a list (RED GREEN BLUE), where each element is between 0.0 and 1.0,
+inclusive."
(if (= S 0.0)
(list L L L)
(let* ((m2 (if (<= L 0.5)
(- (+ 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 (mod (+ H (/ 1.0 3)) 1))
(color-hue-to-rgb m1 m2 H)
- (color-hue-to-rgb m1 m2 (- H (/ 1.0 3)))))))
+ (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."
(apply 'color-rgb-to-hex (color-complement color)))
(defun color-rgb-to-hsv (red green blue)
- "Convert RED, GREEN, and BLUE color components to HSV.
+ "Convert RGB color components to HSV.
RED, GREEN, and BLUE should each be numbers between 0.0 and 1.0,
-inclusive. Return a list (HUE, SATURATION, VALUE), where HUE is
+inclusive. Return a list (HUE SATURATION VALUE), where HUE is
in radians and both SATURATION and VALUE are between 0.0 and 1.0,
inclusive."
(let* ((r (float red))
(max (max r g b))
(min (min r g b)))
(if (< (- max min) 1e-8)
- (list 0.0 0.0 0.0)
+ (list 0.0 0.0 min)
(list
(/ (* 2 float-pi
(cond ((and (= r g) (= g b)) 0)
(+ 240 (* 60 (/ (- r g) (- max min)))))))
360)
(if (= max 0) 0 (- 1 (/ min max)))
- (/ max 255.0)))))
+ max))))
(defun color-rgb-to-hsl (red green blue)
- "Convert RED GREEN BLUE colors to their HSL representation.
+ "Convert RGB colors to their HSL representation.
RED, GREEN, and BLUE should each be numbers between 0.0 and 1.0,
-inclusive.
-
-Return a list (HUE, SATURATION, LUMINANCE), where HUE is in radians
-and both SATURATION and LUMINANCE are between 0.0 and 1.0,
-inclusive."
+inclusive. Return a list (HUE SATURATION LUMINANCE), where
+each element is between 0.0 and 1.0, inclusive."
(let* ((r red)
(g green)
(b blue)
(defun color-srgb-to-xyz (red green blue)
"Convert RED GREEN BLUE colors from the sRGB color space to CIE XYZ.
-RED, BLUE and GREEN must be between 0 and 1, inclusive."
+RED, GREEN and BLUE should be between 0.0 and 1.0, inclusive."
(let ((r (if (<= red 0.04045)
(/ red 12.95)
(expt (/ (+ red 0.055) 1.055) 2.4)))
(defun color-xyz-to-lab (X Y Z &optional white-point)
"Convert CIE XYZ to CIE L*a*b*.
WHITE-POINT specifies the (X Y Z) white point for the
-conversion. If omitted or nil, use `color-d65-xyz'."
- (destructuring-bind (Xr Yr Zr) (or white-point color-d65-xyz)
- (let* ((xr (/ X Xr))
+conversion. If omitted or nil, use `color-d65-xyz'."
+ (pcase-let* ((`(,Xr ,Yr ,Zr) (or white-point color-d65-xyz))
+ (xr (/ X Xr))
(yr (/ Y Yr))
(zr (/ Z Zr))
(fx (if (> xr color-cie-ε)
(list
(- (* 116 fy) 16) ; L
(* 500 (- fx fy)) ; a
- (* 200 (- fy fz)))))) ; b
+ (* 200 (- fy fz))))) ; b
(defun color-lab-to-xyz (L a b &optional white-point)
"Convert CIE L*a*b* to CIE XYZ.
WHITE-POINT specifies the (X Y Z) white point for the
-conversion. If omitted or nil, use `color-d65-xyz'."
- (destructuring-bind (Xr Yr Zr) (or white-point color-d65-xyz)
- (let* ((fy (/ (+ L 16) 116.0))
+conversion. If omitted or nil, use `color-d65-xyz'."
+ (pcase-let* ((`(,Xr ,Yr ,Zr) (or white-point color-d65-xyz))
+ (fy (/ (+ L 16) 116.0))
(fz (- fy (/ b 200.0)))
(fx (+ (/ a 500.0) fy))
(xr (if (> (expt fx 3.0) color-cie-ε)
(/ (- (* 116 fz) 16) color-cie-κ))))
(list (* xr Xr) ; X
(* yr Yr) ; Y
- (* zr Zr))))) ; Z
+ (* zr Zr)))) ; Z
(defun color-srgb-to-lab (red green blue)
"Convert RGB to CIE L*a*b*."
"Return the CIEDE2000 color distance between COLOR1 and COLOR2.
Both COLOR1 and COLOR2 should be in CIE L*a*b* format, as
returned by `color-srgb-to-lab' or `color-xyz-to-lab'."
- (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))))
+ (pcase-let*
+ ((`(,L₁ ,a₁ ,b₁) color1)
+ (`(,L₂ ,a₂ ,b₂) color2)
+ (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)))))))))
+ (* Rt (/ ΔC′ (* Sc kC)) (/ ΔH′ (* Sh kH)))))))
(defun color-clamp (value)
"Make sure VALUE is a number between 0.0 and 1.0 inclusive."
(min 1.0 (max 0.0 value)))
(defun color-saturate-hsl (H S L percent)
- "Return a color PERCENT more saturated than the one defined in
-H S L color-space.
-
-Return a list (HUE, SATURATION, LUMINANCE), where HUE is in radians
-and both SATURATION and LUMINANCE are between 0.0 and 1.0,
-inclusive."
+ "Make a color more saturated by a specified amount.
+Given a color defined in terms of hue, saturation, and luminance
+\(arguments H, S, and L), return a color that is PERCENT more
+saturated. Returns a list (HUE SATURATION LUMINANCE)."
(list H (color-clamp (+ S (/ percent 100.0))) L))
(defun color-saturate-name (name percent)
- "Short hand to saturate COLOR by PERCENT.
-
+ "Make a color with a specified NAME more saturated by PERCENT.
See `color-saturate-hsl'."
(apply 'color-rgb-to-hex
(apply 'color-hsl-to-rgb
(list percent))))))
(defun color-desaturate-hsl (H S L percent)
- "Return a color PERCENT less saturated than the one defined in
-H S L color-space.
-
-Return a list (HUE, SATURATION, LUMINANCE), where HUE is in radians
-and both SATURATION and LUMINANCE are between 0.0 and 1.0,
-inclusive."
+ "Make a color less saturated by a specified amount.
+Given a color defined in terms of hue, saturation, and luminance
+\(arguments H, S, and L), return a color that is PERCENT less
+saturated. Returns a list (HUE SATURATION LUMINANCE)."
(color-saturate-hsl H S L (- percent)))
(defun color-desaturate-name (name percent)
- "Short hand to desaturate COLOR by PERCENT.
-
+ "Make a color with a specified NAME less saturated by PERCENT.
See `color-desaturate-hsl'."
(color-saturate-name name (- percent)))
(defun color-lighten-hsl (H S L percent)
- "Return a color PERCENT lighter than the one defined in
-H S L color-space.
-
-Return a list (HUE, SATURATION, LUMINANCE), where HUE is in radians
-and both SATURATION and LUMINANCE are between 0.0 and 1.0,
-inclusive."
+ "Make a color lighter by a specified amount.
+Given a color defined in terms of hue, saturation, and luminance
+\(arguments H, S, and L), return a color that is PERCENT lighter.
+Returns a list (HUE SATURATION LUMINANCE)."
(list H S (color-clamp (+ L (/ percent 100.0)))))
(defun color-lighten-name (name percent)
- "Short hand to saturate COLOR by PERCENT.
-
+ "Make a color with a specified NAME lighter by PERCENT.
See `color-lighten-hsl'."
(apply 'color-rgb-to-hex
(apply 'color-hsl-to-rgb
- (apply 'color-lighten--hsl
+ (apply 'color-lighten-hsl
(append
(apply 'color-rgb-to-hsl
(color-name-to-rgb name))
(list percent))))))
(defun color-darken-hsl (H S L percent)
- "Return a color PERCENT darker than the one defined in
-H S L color-space.
-
-Return a list (HUE, SATURATION, LUMINANCE), where HUE is in radians
-and both SATURATION and LUMINANCE are between 0.0 and 1.0,
-inclusive."
+ "Make a color darker by a specified amount.
+Given a color defined in terms of hue, saturation, and luminance
+\(arguments H, S, and L), return a color that is PERCENT darker.
+Returns a list (HUE SATURATION LUMINANCE)."
(color-lighten-hsl H S L (- percent)))
(defun color-darken-name (name percent)
- "Short hand to saturate COLOR by PERCENT.
-
+ "Make a color with a specified NAME darker by PERCENT.
See `color-darken-hsl'."
(color-lighten-name name (- percent)))
HCoop / bpt / emacs.git / blobdiff