From 403bb8f3d85d3e34769067db496ab067211d06ad Mon Sep 17 00:00:00 2001 From: Lars Mueller Date: Sun, 10 Jan 2021 17:32:45 +0100 Subject: [PATCH] Colorspec class with conversion methods --- minetest.lua | 254 ++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 253 insertions(+), 1 deletion(-) diff --git a/minetest.lua b/minetest.lua index b1db8a0..5963ea3 100644 --- a/minetest.lua +++ b/minetest.lua @@ -394,4 +394,256 @@ function raycast(_pos1, _pos2, objects, liquids) end end return setmetatable({next = next}, {__call = next}) -end \ No newline at end of file +end + +-- As in src/util/string.cpp +named_colors = { + aliceblue = 0xf0f8ff, + antiquewhite = 0xfaebd7, + aqua = 0x00ffff, + aquamarine = 0x7fffd4, + azure = 0xf0ffff, + beige = 0xf5f5dc, + bisque = 0xffe4c4, + black = 0x000000, + blanchedalmond = 0xffebcd, + blue = 0x0000ff, + blueviolet = 0x8a2be2, + brown = 0xa52a2a, + burlywood = 0xdeb887, + cadetblue = 0x5f9ea0, + chartreuse = 0x7fff00, + chocolate = 0xd2691e, + coral = 0xff7f50, + cornflowerblue = 0x6495ed, + cornsilk = 0xfff8dc, + crimson = 0xdc143c, + cyan = 0x00ffff, + darkblue = 0x00008b, + darkcyan = 0x008b8b, + darkgoldenrod = 0xb8860b, + darkgray = 0xa9a9a9, + darkgreen = 0x006400, + darkgrey = 0xa9a9a9, + darkkhaki = 0xbdb76b, + darkmagenta = 0x8b008b, + darkolivegreen = 0x556b2f, + darkorange = 0xff8c00, + darkorchid = 0x9932cc, + darkred = 0x8b0000, + darksalmon = 0xe9967a, + darkseagreen = 0x8fbc8f, + darkslateblue = 0x483d8b, + darkslategray = 0x2f4f4f, + darkslategrey = 0x2f4f4f, + darkturquoise = 0x00ced1, + darkviolet = 0x9400d3, + deeppink = 0xff1493, + deepskyblue = 0x00bfff, + dimgray = 0x696969, + dimgrey = 0x696969, + dodgerblue = 0x1e90ff, + firebrick = 0xb22222, + floralwhite = 0xfffaf0, + forestgreen = 0x228b22, + fuchsia = 0xff00ff, + gainsboro = 0xdcdcdc, + ghostwhite = 0xf8f8ff, + gold = 0xffd700, + goldenrod = 0xdaa520, + gray = 0x808080, + green = 0x008000, + greenyellow = 0xadff2f, + grey = 0x808080, + honeydew = 0xf0fff0, + hotpink = 0xff69b4, + indianred = 0xcd5c5c, + indigo = 0x4b0082, + ivory = 0xfffff0, + khaki = 0xf0e68c, + lavender = 0xe6e6fa, + lavenderblush = 0xfff0f5, + lawngreen = 0x7cfc00, + lemonchiffon = 0xfffacd, + lightblue = 0xadd8e6, + lightcoral = 0xf08080, + lightcyan = 0xe0ffff, + lightgoldenrodyellow = 0xfafad2, + lightgray = 0xd3d3d3, + lightgreen = 0x90ee90, + lightgrey = 0xd3d3d3, + lightpink = 0xffb6c1, + lightsalmon = 0xffa07a, + lightseagreen = 0x20b2aa, + lightskyblue = 0x87cefa, + lightslategray = 0x778899, + lightslategrey = 0x778899, + lightsteelblue = 0xb0c4de, + lightyellow = 0xffffe0, + lime = 0x00ff00, + limegreen = 0x32cd32, + linen = 0xfaf0e6, + magenta = 0xff00ff, + maroon = 0x800000, + mediumaquamarine = 0x66cdaa, + mediumblue = 0x0000cd, + mediumorchid = 0xba55d3, + mediumpurple = 0x9370db, + mediumseagreen = 0x3cb371, + mediumslateblue = 0x7b68ee, + mediumspringgreen = 0x00fa9a, + mediumturquoise = 0x48d1cc, + mediumvioletred = 0xc71585, + midnightblue = 0x191970, + mintcream = 0xf5fffa, + mistyrose = 0xffe4e1, + moccasin = 0xffe4b5, + navajowhite = 0xffdead, + navy = 0x000080, + oldlace = 0xfdf5e6, + olive = 0x808000, + olivedrab = 0x6b8e23, + orange = 0xffa500, + orangered = 0xff4500, + orchid = 0xda70d6, + palegoldenrod = 0xeee8aa, + palegreen = 0x98fb98, + paleturquoise = 0xafeeee, + palevioletred = 0xdb7093, + papayawhip = 0xffefd5, + peachpuff = 0xffdab9, + peru = 0xcd853f, + pink = 0xffc0cb, + plum = 0xdda0dd, + powderblue = 0xb0e0e6, + purple = 0x800080, + red = 0xff0000, + rosybrown = 0xbc8f8f, + royalblue = 0x4169e1, + saddlebrown = 0x8b4513, + salmon = 0xfa8072, + sandybrown = 0xf4a460, + seagreen = 0x2e8b57, + seashell = 0xfff5ee, + sienna = 0xa0522d, + silver = 0xc0c0c0, + skyblue = 0x87ceeb, + slateblue = 0x6a5acd, + slategray = 0x708090, + slategrey = 0x708090, + snow = 0xfffafa, + springgreen = 0x00ff7f, + steelblue = 0x4682b4, + tan = 0xd2b48c, + teal = 0x008080, + thistle = 0xd8bfd8, + tomato = 0xff6347, + turquoise = 0x40e0d0, + violet = 0xee82ee, + wheat = 0xf5deb3, + white = 0xffffff, + whitesmoke = 0xf5f5f5, + yellow = 0xffff00, + yellowgreen = 0x9acd32 +} + +colorspec = {} + +local colorspec_metatable = {__index = colorspec} + +function colorspec.new(table) + return setmetatable({ + r = assert(table.r), + g = assert(table.g), + b = assert(table.b), + a = table.a or 255 + }, colorspec_metatable) +end + +colorspec.from_table = colorspec.new + +function colorspec.from_string(string) + local hex = "#([A-Fa-f%d])+" + local number, alpha = named_colors[string], 0xFF + if not number then + local name, alpha_text = string:match("^([a-z])+" .. hex .. "$") + assert(alpha_text:len() == 2) + number = assert(named_colors[name]) + alpha = tonumber(alpha_text, 16) + end + if number then + return colorspec.from_number(number * 0xFF + alpha) + end + local hex_text = string:match(hex) + local len, num = hex_text:len(), tonumber(hex_text, 16) + if len == 8 then + return colorspec.from_number(num) + end + if len == 6 then + return colorspec.from_number(num * 0xFF + 0xFF) + end + local floor = math.floor + if len == 4 then + return colorspec.from_table{ + a = (num % 16) * 17, + b = (floor(num / 16) % 16) * 17, + g = (floor(num / (16 ^ 2)) % 16) * 17, + r = (floor(num / (16 ^ 3)) % 16) * 17 + } + end + if len == 3 then + return colorspec.from_table{ + b = (num % 16) * 17, + g = (floor(num / 16) % 16) * 17, + r = (floor(num / (16 ^ 2)) % 16) * 17 + } + end + error("Invalid colorstring: " .. string) +end + +colorspec.from_text = colorspec.from_string + +function colorspec.from_number(number) + local floor = math.floor + return colorspec.from_table{ + a = number % 0xFF, + b = floor(number / 0xFF) % 0xFF, + g = floor(number / 0xFFFF) % 0xFF, + r = floor(number / 0xFFFFFF) + } +end + +function colorspec.from_any(value) + local type = type(value) + if type == "table" then + return colorspec.from_table(value) + end + if type == "string" then + return colorspec.from_string(value) + end + if type == "number" then + return colorspec.from_number(value) + end + error("Unsupported type " .. type) +end + +function colorspec:to_table() + return self +end + +--> hex string, omits alpha if possible (if opaque) +function colorspec:to_string() + if self.a == 255 then + return ("%02X02X02X"):format(self.r, self.g, self.b) + end + return ("%02X02X02X02X"):format(self.r, self.g, self.b, self.a) +end + +function colorspec:to_number() + return self.r * 0xFFFFFF + self.g * 0xFFFF + self.b * 0xFF + self.a +end + +colorspec_to_colorstring = _G.minetest.colorspec_to_colorstring or function(spec) + return colorspec.from_any(spec):to_string() +end +