#

# The Python Imaging Library

# $Id: //modules/pil/PIL/ImageColor.py#2 $

#

# map CSS3-style colour description strings to RGB

#

# History:

# 2002-10-24 fl   Added support for CSS-style color strings

# 2002-12-15 fl   Added RGBA support

#

# Copyright (c) 2002 by Secret Labs AB

# Copyright (c) 2002 by Fredrik Lundh

#

# See the README file for information on usage and redistribution.

#



import Image

import re, string



##

# Convert color string to RGB tuple.

#

# @param color A CSS3-style colour string.

# @return An RGB-tuple.

# @exception ValueError String format not supported.



def getrgb(color):

    # FIXME: add RGBA support

    try:

        rgb = colormap[color]

    except KeyError:

        try:

            # fall back on case-insensitive lookup

            rgb = colormap[string.lower(color)]

        except KeyError:

            rgb = None

    # found color in cache

    if rgb:

        if isinstance(rgb, type(())):

            return rgb

        colormap[color] = rgb = getrgb(rgb)

        return rgb

    # check for known string formats

    m = re.match("#\w\w\w$", color)

    if m:

        return (

            int(color[1]*2, 16),

            int(color[2]*2, 16),

            int(color[3]*2, 16)

            )

    m = re.match("#\w\w\w\w\w\w$", color)

    if m:

        return (

            int(color[1:3], 16),

            int(color[3:5], 16),

            int(color[5:7], 16)

            )

    m = re.match("rgb\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$", color)

    if m:

        return (

            int(m.group(1)),

            int(m.group(2)),

            int(m.group(3))

            )

    m = re.match("rgb\(\s*(\d+)%\s*,\s*(\d+)%\s*,\s*(\d+)%\s*\)$", color)

    if m:

        return (

            int((int(m.group(1)) * 255) / 100.0 + 0.5),

            int((int(m.group(2)) * 255) / 100.0 + 0.5),

            int((int(m.group(3)) * 255) / 100.0 + 0.5)

            )

    m = re.match("hsl\(\s*(\d+)\s*,\s*(\d+)%\s*,\s*(\d+)%\s*\)$", color)

    if m:

        from colorsys import hls_to_rgb

        rgb = hls_to_rgb(

            float(m.group(1)) / 360.0,

            float(m.group(3)) / 100.0,

            float(m.group(2)) / 100.0,

            )

        return (

            int(rgb[0] * 255 + 0.5),

            int(rgb[1] * 255 + 0.5),

            int(rgb[2] * 255 + 0.5)

            )

    raise ValueError("unknown color specifier: %r" % color)



def getcolor(color, mode):

    # same as getrgb, but converts the result to the given mode

    color = getrgb(color)

    if mode == "RGB":

        return color

    if mode == "RGBA":

        r, g, b = color

        return r, g, b, 255

    if Image.getmodebase(mode) == "L":

        r, g, b = color

        return r*299/1000 + g*587/1000 + b*114/1000

    return color



colormap = {

    # X11 colour table (from "CSS3 module: Color working draft").  this

    # is a superset of HTML 4.0 color names used in CSS 1.

    "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",

    "darkgreen": "#006400",

    "darkkhaki": "#bdb76b",

    "darkmagenta": "#8b008b",

    "darkolivegreen": "#556b2f",

    "darkorange": "#ff8c00",

    "darkorchid": "#9932cc",

    "darkred": "#8b0000",

    "darksalmon": "#e9967a",

    "darkseagreen": "#8fbc8f",

    "darkslateblue": "#483d8b",

    "darkslategray": "#2f4f4f",

    "darkturquoise": "#00ced1",

    "darkviolet": "#9400d3",

    "deeppink": "#ff1493",

    "deepskyblue": "#00bfff",

    "dimgray": "#696969",

    "dodgerblue": "#1e90ff",

    "firebrick": "#b22222",

    "floralwhite": "#fffaf0",

    "forestgreen": "#228b22",

    "fuchsia": "#ff00ff",

    "gainsboro": "#dcdcdc",

    "ghostwhite": "#f8f8ff",

    "gold": "#ffd700",

    "goldenrod": "#daa520",

    "gray": "#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",

    "lightgreen": "#90ee90",

    "lightgrey": "#d3d3d3",

    "lightpink": "#ffb6c1",

    "lightsalmon": "#ffa07a",

    "lightseagreen": "#20b2aa",

    "lightskyblue": "#87cefa",

    "lightslategray": "#778899",

    "lightsteelblue": "#b0c4de",

    "lightyellow": "#ffffe0",

    "lime": "#00ff00",

    "limegreen": "#32cd32",

    "linen": "#faf0e6",

    "magenta": "#ff00ff",

    "maroon": "#800000",

    "mediumaquamarine": "#66cdaa",

    "mediumblue": "#0000cd",

    "mediumorchid": "#ba55d3",

    "mediumpurple": "#9370db",

    "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": "#db7093",

    "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",

    "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",

}