;;; Code:
-(require 'color-lab)
+(require 'color)
+(eval-when-compile (require 'cl))
(defgroup shr-color nil
"Simple HTML Renderer colors"
:group 'shr
:type 'integer)
+(defconst shr-color-html-colors-alist
+ '(("AliceBlue" . "#F0F8FF")
+ ("AntiqueWhite" . "#FAEBD7")
+ ("Aqua" . "#00FFFF")
+ ("Aquamarine" . "#7FFFD4")
+ ("Azure" . "#F0FFFF")
+ ("Beige" . "#F5F5DC")
+ ("Bisque" . "#FFE4C4")
+ ("Black" . "#000000")
+ ("BlanchedAlmond" . "#FFEBCD")
+ ("Blue" . "#0000FF")
+ ("BlueViolet" . "#8A2BE2")
+ ("Brown" . "#A52A2A")
+ ("BurlyWood" . "#DEB887")
+ ("CadetBlue" . "#5F9EA0")
+ ("Chartreuse" . "#7FFF00")
+ ("Chocolate" . "#D2691E")
+ ("Coral" . "#FF7F50")
+ ("CornflowerBlue" . "#6495ED")
+ ("Cornsilk" . "#FFF8DC")
+ ("Crimson" . "#DC143C")
+ ("Cyan" . "#00FFFF")
+ ("DarkBlue" . "#00008B")
+ ("DarkCyan" . "#008B8B")
+ ("DarkGoldenRod" . "#B8860B")
+ ("DarkGray" . "#A9A9A9")
+ ("DarkGrey" . "#A9A9A9")
+ ("DarkGreen" . "#006400")
+ ("DarkKhaki" . "#BDB76B")
+ ("DarkMagenta" . "#8B008B")
+ ("DarkOliveGreen" . "#556B2F")
+ ("Darkorange" . "#FF8C00")
+ ("DarkOrchid" . "#9932CC")
+ ("DarkRed" . "#8B0000")
+ ("DarkSalmon" . "#E9967A")
+ ("DarkSeaGreen" . "#8FBC8F")
+ ("DarkSlateBlue" . "#483D8B")
+ ("DarkSlateGray" . "#2F4F4F")
+ ("DarkSlateGrey" . "#2F4F4F")
+ ("DarkTurquoise" . "#00CED1")
+ ("DarkViolet" . "#9400D3")
+ ("DeepPink" . "#FF1493")
+ ("DeepSkyBlue" . "#00BFFF")
+ ("DimGray" . "#696969")
+ ("DimGrey" . "#696969")
+ ("DodgerBlue" . "#1E90FF")
+ ("FireBrick" . "#B22222")
+ ("FloralWhite" . "#FFFAF0")
+ ("ForestGreen" . "#228B22")
+ ("Fuchsia" . "#FF00FF")
+ ("Gainsboro" . "#DCDCDC")
+ ("GhostWhite" . "#F8F8FF")
+ ("Gold" . "#FFD700")
+ ("GoldenRod" . "#DAA520")
+ ("Gray" . "#808080")
+ ("Grey" . "#808080")
+ ("Green" . "#008000")
+ ("GreenYellow" . "#ADFF2F")
+ ("HoneyDew" . "#F0FFF0")
+ ("HotPink" . "#FF69B4")
+ ("IndianRed" . "#CD5C5C")
+ ("Indigo" . "#4B0082")
+ ("Ivory" . "#FFFFF0")
+ ("Khaki" . "#F0E68C")
+ ("Lavender" . "#E6E6FA")
+ ("LavenderBlush" . "#FFF0F5")
+ ("LawnGreen" . "#7CFC00")
+ ("LemonChiffon" . "#FFFACD")
+ ("LightBlue" . "#ADD8E6")
+ ("LightCoral" . "#F08080")
+ ("LightCyan" . "#E0FFFF")
+ ("LightGoldenRodYellow" . "#FAFAD2")
+ ("LightGray" . "#D3D3D3")
+ ("LightGrey" . "#D3D3D3")
+ ("LightGreen" . "#90EE90")
+ ("LightPink" . "#FFB6C1")
+ ("LightSalmon" . "#FFA07A")
+ ("LightSeaGreen" . "#20B2AA")
+ ("LightSkyBlue" . "#87CEFA")
+ ("LightSlateGray" . "#778899")
+ ("LightSlateGrey" . "#778899")
+ ("LightSteelBlue" . "#B0C4DE")
+ ("LightYellow" . "#FFFFE0")
+ ("Lime" . "#00FF00")
+ ("LimeGreen" . "#32CD32")
+ ("Linen" . "#FAF0E6")
+ ("Magenta" . "#FF00FF")
+ ("Maroon" . "#800000")
+ ("MediumAquaMarine" . "#66CDAA")
+ ("MediumBlue" . "#0000CD")
+ ("MediumOrchid" . "#BA55D3")
+ ("MediumPurple" . "#9370D8")
+ ("MediumSeaGreen" . "#3CB371")
+ ("MediumSlateBlue" . "#7B68EE")
+ ("MediumSpringGreen" . "#00FA9A")
+ ("MediumTurquoise" . "#48D1CC")
+ ("MediumVioletRed" . "#C71585")
+ ("MidnightBlue" . "#191970")
+ ("MintCream" . "#F5FFFA")
+ ("MistyRose" . "#FFE4E1")
+ ("Moccasin" . "#FFE4B5")
+ ("NavajoWhite" . "#FFDEAD")
+ ("Navy" . "#000080")
+ ("OldLace" . "#FDF5E6")
+ ("Olive" . "#808000")
+ ("OliveDrab" . "#6B8E23")
+ ("Orange" . "#FFA500")
+ ("OrangeRed" . "#FF4500")
+ ("Orchid" . "#DA70D6")
+ ("PaleGoldenRod" . "#EEE8AA")
+ ("PaleGreen" . "#98FB98")
+ ("PaleTurquoise" . "#AFEEEE")
+ ("PaleVioletRed" . "#D87093")
+ ("PapayaWhip" . "#FFEFD5")
+ ("PeachPuff" . "#FFDAB9")
+ ("Peru" . "#CD853F")
+ ("Pink" . "#FFC0CB")
+ ("Plum" . "#DDA0DD")
+ ("PowderBlue" . "#B0E0E6")
+ ("Purple" . "#800080")
+ ("Red" . "#FF0000")
+ ("RosyBrown" . "#BC8F8F")
+ ("RoyalBlue" . "#4169E1")
+ ("SaddleBrown" . "#8B4513")
+ ("Salmon" . "#FA8072")
+ ("SandyBrown" . "#F4A460")
+ ("SeaGreen" . "#2E8B57")
+ ("SeaShell" . "#FFF5EE")
+ ("Sienna" . "#A0522D")
+ ("Silver" . "#C0C0C0")
+ ("SkyBlue" . "#87CEEB")
+ ("SlateBlue" . "#6A5ACD")
+ ("SlateGray" . "#708090")
+ ("SlateGrey" . "#708090")
+ ("Snow" . "#FFFAFA")
+ ("SpringGreen" . "#00FF7F")
+ ("SteelBlue" . "#4682B4")
+ ("Tan" . "#D2B48C")
+ ("Teal" . "#008080")
+ ("Thistle" . "#D8BFD8")
+ ("Tomato" . "#FF6347")
+ ("Turquoise" . "#40E0D0")
+ ("Violet" . "#EE82EE")
+ ("Wheat" . "#F5DEB3")
+ ("White" . "#FFFFFF")
+ ("WhiteSmoke" . "#F5F5F5")
+ ("Yellow" . "#FFFF00")
+ ("YellowGreen" . "#9ACD32"))
+ "Alist of HTML colors.
+Each entry should have the form (COLOR-NAME . HEXADECIMAL-COLOR).")
+
(defun shr-color-relative-to-absolute (number)
"Convert a relative NUMBER to absolute. If NUMBER is absolute, return NUMBER.
This will convert \"80 %\" to 204, \"100 %\" to 255 but \"123\" to \"123\"."
(/ (* (string-to-number (substring number 0 string-length)) 255) 100)
(string-to-number number))))
+(defun shr-color-hue-to-rgb (x y h)
+ "Convert X Y H to RGB value."
+ (when (< h 0) (incf h))
+ (when (> h 1) (decf h))
+ (cond ((< h (/ 1 6.0)) (+ x (* (- y x) h 6)))
+ ((< h 0.5) y)
+ ((< h (/ 2.0 3.0)) (+ x (* (- y x) (- (/ 2.0 3.0) h) 6)))
+ (t x)))
+
(defun shr-color-hsl-to-rgb-fractions (h s l)
"Convert H S L to fractional RGB values."
(let (m1 m2)
(setq m2 (* l (+ s 1)))
(setq m2 (- (+ l s) (* l s))))
(setq m1 (- (* l 2) m2))
- (list (rainbow-hue-to-rgb m1 m2 (+ h (/ 1 3.0)))
- (rainbow-hue-to-rgb m1 m2 h)
- (rainbow-hue-to-rgb m1 m2 (- h (/ 1 3.0))))))
+ (list (shr-color-hue-to-rgb m1 m2 (+ h (/ 1 3.0)))
+ (shr-color-hue-to-rgb m1 m2 h)
+ (shr-color-hue-to-rgb m1 m2 (- h (/ 1 3.0))))))
(defun shr-color->hexadecimal (color)
"Convert any color format to hexadecimal representation.
Like rgb() or hsl()."
(when color
- (cond ((or (string-match
- "rgb(\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*,\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*,\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*)"
- color)
- (string-match
- "rgba(\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*,\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*,\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*,\s*[0-9]*\.?[0-9]+\s*%?\s*)"
- color))
- (format "#%02X%02X%02X"
- (shr-color-relative-to-absolute (match-string-no-properties 1 color))
- (shr-color-relative-to-absolute (match-string-no-properties 2 color))
- (shr-color-relative-to-absolute (match-string-no-properties 3 color))))
- ((or (string-match
- "hsl(\s*\\([0-9]\\{1,3\\}\\)\s*,\s*\\([0-9]\\{1,3\\}\\)\s*%\s*,\s*\\([0-9]\\{1,3\\}\\)\s*%\s*)"
- color)
- (string-match
- "hsla(\s*\\([0-9]\\{1,3\\}\\)\s*,\s*\\([0-9]\\{1,3\\}\\)\s*%\s*,\s*\\([0-9]\\{1,3\\}\\)\s*%\s*,\s*[0-9]*\.?[0-9]+\s*%?\s*)"
- color))
- (let ((h (/ (string-to-number (match-string-no-properties 1 color)) 360.0))
- (s (/ (string-to-number (match-string-no-properties 2 color)) 100.0))
- (l (/ (string-to-number (match-string-no-properties 3 color)) 100.0)))
- (destructuring-bind (r g b)
- (rainbow-hsl-to-rgb-fractions h s l)
- (format "#%02X%02X%02X" (* r 255) (* g 255) (* b 255)))))
- (t
- color))))
+ (cond
+ ;; Hexadecimal color: #abc or #aabbcc
+ ((string-match
+ "\\(#[0-9a-fA-F]\\{3\\}[0-9a-fA-F]\\{3\\}?\\)"
+ color)
+ (match-string 1 color))
+ ;; rgb() or rgba() colors
+ ((or (string-match
+ "rgb(\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*,\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*,\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*)"
+ color)
+ (string-match
+ "rgba(\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*,\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*,\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*,\s*[0-9]*\.?[0-9]+\s*%?\s*)"
+ color))
+ (format "#%02X%02X%02X"
+ (shr-color-relative-to-absolute (match-string-no-properties 1 color))
+ (shr-color-relative-to-absolute (match-string-no-properties 2 color))
+ (shr-color-relative-to-absolute (match-string-no-properties 3 color))))
+ ;; hsl() or hsla() colors
+ ((or (string-match
+ "hsl(\s*\\([0-9]\\{1,3\\}\\)\s*,\s*\\([0-9]\\{1,3\\}\\)\s*%\s*,\s*\\([0-9]\\{1,3\\}\\)\s*%\s*)"
+ color)
+ (string-match
+ "hsla(\s*\\([0-9]\\{1,3\\}\\)\s*,\s*\\([0-9]\\{1,3\\}\\)\s*%\s*,\s*\\([0-9]\\{1,3\\}\\)\s*%\s*,\s*[0-9]*\.?[0-9]+\s*%?\s*)"
+ color))
+ (let ((h (/ (string-to-number (match-string-no-properties 1 color)) 360.0))
+ (s (/ (string-to-number (match-string-no-properties 2 color)) 100.0))
+ (l (/ (string-to-number (match-string-no-properties 3 color)) 100.0)))
+ (destructuring-bind (r g b)
+ (shr-color-hsl-to-rgb-fractions h s l)
+ (color-rgb->hex r g b))))
+ ;; Color names
+ ((cdr (assoc-string color shr-color-html-colors-alist t)))
+ ;; Unrecognized color :(
+ (t
+ nil))))
(defun set-minimum-interval (val1 val2 min max interval &optional fixed)
"Set minimum interval between VAL1 and VAL2 to INTERVAL.
(defun shr-color-visible (bg fg &optional fixed-background)
"Check that BG and FG colors are visible if they are drawn on each other.
-Return t if they are. If they are too similar, two new colors are
-returned instead.
+Return (bg fg) if they are. If they are too similar, two new
+colors are returned instead.
If FIXED-BACKGROUND is set, and if the color are not visible, a
new background color will not be computed. Only the foreground
color will be adapted to be visible on BG."
;; Convert fg and bg to CIE Lab
- (let* ((fg-lab (apply 'rgb->lab (rgb->normalize fg)))
- (bg-lab (apply 'rgb->lab (rgb->normalize bg)))
- ;; Compute color distance using CIE DE 2000
- (fg-bg-distance (color-lab-ciede2000 fg-lab bg-lab))
- ;; Compute luminance distance (substract L component)
- (luminance-distance (abs (- (car fg-lab) (car bg-lab)))))
- (if (and (>= fg-bg-distance shr-color-visible-distance-min)
- (>= luminance-distance shr-color-visible-luminance-min))
- (list bg fg)
- ;; Not visible, try to change luminance to make them visible
- (let ((Ls (set-minimum-interval (car bg-lab) (car fg-lab) 0 100
- shr-color-visible-luminance-min
- fixed-background)))
- (setcar bg-lab (car Ls))
- (setcar fg-lab (cadr Ls))
- (list
- (apply 'format "#%02x%02x%02x"
- (mapcar (lambda (x) (* (max (min 1 x) 0) 255)) (apply 'lab->rgb bg-lab)))
- (apply 'format "#%02x%02x%02x"
- (mapcar (lambda (x) (* (max (min 1 x) 0) 255)) (apply 'lab->rgb fg-lab))))))))
+ (let ((fg-norm (color-rgb->normalize fg))
+ (bg-norm (color-rgb->normalize bg)))
+ (if (or (null fg-norm)
+ (null bg-norm))
+ (list bg fg)
+ (let* ((fg-lab (apply 'color-srgb->lab fg-norm))
+ (bg-lab (apply 'color-srgb->lab bg-norm))
+ ;; Compute color distance using CIE DE 2000
+ (fg-bg-distance (color-cie-de2000 fg-lab bg-lab))
+ ;; Compute luminance distance (substract L component)
+ (luminance-distance (abs (- (car fg-lab) (car bg-lab)))))
+ (if (and (>= fg-bg-distance shr-color-visible-distance-min)
+ (>= luminance-distance shr-color-visible-luminance-min))
+ (list bg fg)
+ ;; Not visible, try to change luminance to make them visible
+ (let ((Ls (set-minimum-interval (car bg-lab) (car fg-lab) 0 100
+ shr-color-visible-luminance-min
+ fixed-background)))
+ (unless fixed-background
+ (setcar bg-lab (car Ls)))
+ (setcar fg-lab (cadr Ls))
+ (list
+ (if fixed-background
+ bg
+ (apply 'format "#%02x%02x%02x"
+ (mapcar (lambda (x) (* (max (min 1 x) 0) 255))
+ (apply 'color-lab->srgb bg-lab))))
+ (apply 'format "#%02x%02x%02x"
+ (mapcar (lambda (x) (* (max (min 1 x) 0) 255))
+ (apply 'color-lab->srgb fg-lab))))))))))
(provide 'shr-color)
projects / gnus / blobdiff