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Converts HEX code to numbers in RGB for Lua 5.x
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| do | |
| local match = string.match | |
| local cashedHEX = {["00"] = 0, ["0A"] = 10, ["0B"] = 11, ["0C"] = 12, ["0E"] = 14, ["0F"] = 15, ["0a"] = 10, ["0b"] = 11, ["0c"] = 12, ["0f"] = 15, ["01"] = 1, ["1A"] = 26, ["1B"] = 27, ["1C"] = 28, ["1E"] = 30, ["1F"] = 31, ["1a"] = 26, ["1b"] = 27, ["1c"] = 28, ["1f"] = 31, ["02"] = 2, ["2A"] = 42, ["2B"] = 43, ["2C"] = 44, ["2E"] = 46, ["2F"] = 47, ["2a"] = 42, ["2b"] = 43, ["2c"] = 44, ["2f"] = 47, ["03"] = 3, ["3A"] = 58, ["3B"] = 59, ["3C"] = 60, ["3E"] = 62, ["3F"] = 63, ["3a"] = 58, ["3b"] = 59, ["3c"] = 60, ["3f"] = 63, ["04"] = 4, ["4A"] = 74, ["4B"] = 75, ["4C"] = 76, ["4E"] = 78, ["4F"] = 79, ["4a"] = 74, ["4b"] = 75, ["4c"] = 76, ["4f"] = 79, ["05"] = 5, ["5A"] = 90, ["5B"] = 91, ["5C"] = 92, ["5E"] = 94, ["5F"] = 95, ["5a"] = 90, ["5b"] = 91, ["5c"] = 92, ["5f"] = 95, ["06"] = 6, ["6A"] = 106, ["6B"] = 107, ["6C"] = 108, ["6E"] = 110, ["6F"] = 111, ["6a"] = 106, ["6b"] = 107, ["6c"] = 108, ["6f"] = 111, ["07"] = 7, ["7A"] = 122, ["7B"] = 123, ["7C"] = 124, ["7E"] = 126, ["7F"] = 127, ["7a"] = 122, ["7b"] = 123, ["7c"] = 124, ["7f"] = 127, ["08"] = 8, ["8A"] = 138, ["8B"] = 139, ["8C"] = 140, ["8E"] = 142, ["8F"] = 143, ["8a"] = 138, ["8b"] = 139, ["8c"] = 140, ["8f"] = 143, ["09"] = 9, ["9A"] = 154, ["9B"] = 155, ["9C"] = 156, ["9E"] = 158, ["9F"] = 159, ["9a"] = 154, ["9b"] = 155, ["9c"] = 156, ["9f"] = 159, ["10"] = 16, ["11"] = 17, ["12"] = 18, ["13"] = 19, ["14"] = 20, ["15"] = 21, ["16"] = 22, ["17"] = 23, ["18"] = 24, ["19"] = 25, ["20"] = 32, ["21"] = 33, ["22"] = 34, ["23"] = 35, ["24"] = 36, ["25"] = 37, ["26"] = 38, ["27"] = 39, ["28"] = 40, ["29"] = 41, ["30"] = 48, ["31"] = 49, ["32"] = 50, ["33"] = 51, ["34"] = 52, ["35"] = 53, ["36"] = 54, ["37"] = 55, ["38"] = 56, ["39"] = 57, ["40"] = 64, ["41"] = 65, ["42"] = 66, ["43"] = 67, ["44"] = 68, ["45"] = 69, ["46"] = 70, ["47"] = 71, ["48"] = 72, ["49"] = 73, ["50"] = 80, ["51"] = 81, ["52"] = 82, ["53"] = 83, ["54"] = 84, ["55"] = 85, ["56"] = 86, ["57"] = 87, ["58"] = 88, ["59"] = 89, ["60"] = 96, ["61"] = 97, ["62"] = 98, ["63"] = 99, ["64"] = 100, ["65"] = 101, ["66"] = 102, ["67"] = 103, ["68"] = 104, ["69"] = 105, ["70"] = 112, ["71"] = 113, ["72"] = 114, ["73"] = 115, ["74"] = 116, ["75"] = 117, ["76"] = 118, ["77"] = 119, ["78"] = 120, ["79"] = 121, ["80"] = 128, ["81"] = 129, ["82"] = 130, ["83"] = 131, ["84"] = 132, ["85"] = 133, ["86"] = 134, ["87"] = 135, ["88"] = 136, ["89"] = 137, ["90"] = 144, ["91"] = 145, ["92"] = 146, ["93"] = 147, ["94"] = 148, ["95"] = 149, ["96"] = 150, ["97"] = 151, ["98"] = 152, ["99"] = 153, A0 = 160, A1 = 161, A2 = 162, A3 = 163, A4 = 164, A5 = 165, A6 = 166, A7 = 167, A8 = 168, A9 = 169, AA = 170, AB = 171, AC = 172, AE = 174, AF = 175, Aa = 170, Ab = 171, Ac = 172, Af = 175, B0 = 176, B1 = 177, B2 = 178, B3 = 179, B4 = 180, B5 = 181, B6 = 182, B7 = 183, B8 = 184, B9 = 185, BA = 186, BB = 187, BC = 188, BE = 190, BF = 191, Ba = 186, Bb = 187, Bc = 188, Bf = 191, C0 = 192, C1 = 193, C2 = 194, C3 = 195, C4 = 196, C5 = 197, C6 = 198, C7 = 199, C8 = 200, C9 = 201, CA = 202, CB = 203, CC = 204, CE = 206, CF = 207, Ca = 202, Cb = 203, Cc = 204, Cf = 207, E0 = 224, E1 = 225, E2 = 226, E3 = 227, E4 = 228, E5 = 229, E6 = 230, E7 = 231, E8 = 232, E9 = 233, EA = 234, EB = 235, EC = 236, EE = 238, EF = 239, Ea = 234, Eb = 235, Ec = 236, Ef = 239, F0 = 240, F1 = 241, F2 = 242, F3 = 243, F4 = 244, F5 = 245, F6 = 246, F7 = 247, F8 = 248, F9 = 249, FA = 250, FB = 251, FC = 252, FE = 254, FF = 255, Fa = 250, Fb = 251, Fc = 252, Ff = 255, a0 = 160, a1 = 161, a2 = 162, a3 = 163, a4 = 164, a5 = 165, a6 = 166, a7 = 167, a8 = 168, a9 = 169, aA = 170, aB = 171, aC = 172, aE = 174, aF = 175, aa = 170, ab = 171, ac = 172, af = 175, b0 = 176, b1 = 177, b2 = 178, b3 = 179, b4 = 180, b5 = 181, b6 = 182, b7 = 183, b8 = 184, b9 = 185, bA = 186, bB = 187, bC = 188, bE = 190, bF = 191, ba = 186, bb = 187, bc = 188, bf = 191, c0 = 192, c1 = 193, c2 = 194, c3 = 195, c4 = 196, c5 = 197, c6 = 198, c7 = 199, c8 = 200, c9 = 201, cA = 202, cB = 203, cC = 204, cE = 206, cF = 207, ca = 202, cb = 203, cc = 204, cf = 207, f0 = 240, f1 = 241, f2 = 242, f3 = 243, f4 = 244, f5 = 245, f6 = 246, f7 = 247, f8 = 248, f9 = 249, fA = 250, fB = 251, fC = 252, fE = 254, fF = 255, fa = 250, fb = 251, fc = 252, ff = 255} | |
| local cashedShortHEX = {["0"] = 0, ["1"] = 17, ["2"] = 34, ["3"] = 51, ["4"] = 68, ["5"] = 85, ["6"] = 102, ["7"] = 119, ["8"] = 136, ["9"] = 153, A = 170, B = 187, C = 204, E = 238, F = 255, a = 170, b = 187, c = 204, f = 255} | |
| -- Converts HEX code to numbers in RGB | |
| ---@param hex string | |
| ---@return number red, number green, number blue | |
| function hex2rgb(hex) | |
| local length = #hex | |
| if length == 7 then | |
| local r, g, b = match(hex, '.(..)(..)(..)') | |
| return cashedHEX[r], cashedHEX[g], cashedHEX[b] | |
| elseif length == 6 then | |
| local r, g, b = match(hex, '(..)(..)(..)') | |
| return cashedHEX[r], cashedHEX[g], cashedHEX[b] | |
| elseif length == 4 then | |
| local r, g, b = match(hex, '.(.)(.)(.)') | |
| return cashedShortHEX[r], cashedShortHEX[g], cashedShortHEX[b] | |
| elseif length == 3 then | |
| local r, g, b = match(hex, '(.)(.)(.)') | |
| return cashedShortHEX[r], cashedShortHEX[g], cashedShortHEX[b] | |
| end | |
| end | |
| end |
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| do | |
| local match = string.match | |
| -- Converts HEX code to numbers in RGB | |
| ---@param hex string | |
| ---@return number red, number green, number blue | |
| function hex2rgb(hex) | |
| local length = #hex | |
| if length == 7 then | |
| local r, g, b = match(hex, '.(..)(..)(..)') | |
| return tonumber(r, 16), tonumber(g, 16), tonumber(b, 16) | |
| elseif length == 6 then | |
| local r, g, b = match(hex, '(..)(..)(..)') | |
| return tonumber(r, 16), tonumber(g, 16), tonumber(b, 16) | |
| elseif length == 4 then | |
| local r, g, b = match(hex, '.(.)(.)(.)') | |
| return tonumber(r..r, 16), tonumber(g..g, 16), tonumber(b..b, 16) | |
| elseif length == 3 then | |
| local r, g, b = match(hex, '(.)(.)(.)') | |
| return tonumber(r..r, 16), tonumber(g..g, 16), tonumber(b..b, 16) | |
| end | |
| end | |
| end |
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| do | |
| local match = string.match | |
| local cashedShortHEX = {["0"] = 0, ["1"] = 17, ["2"] = 34, ["3"] = 51, ["4"] = 68, ["5"] = 85, ["6"] = 102, ["7"] = 119, ["8"] = 136, ["9"] = 153, A = 170, B = 187, C = 204, E = 238, F = 255, a = 170, b = 187, c = 204, f = 255} | |
| -- Converts HEX code to numbers in RGB | |
| ---@param hex string | |
| ---@return number red, number green, number blue | |
| function hex2rgb(hex) | |
| local length = #hex | |
| if length == 7 then | |
| local r, g, b = match(hex, '.(..)(..)(..)') | |
| return tonumber(r, 16), tonumber(g, 16), tonumber(b, 16) | |
| elseif length == 6 then | |
| local r, g, b = match(hex, '(..)(..)(..)') | |
| return tonumber(r, 16), tonumber(g, 16), tonumber(b, 16) | |
| elseif length == 4 then | |
| local r, g, b = match(hex, '.(.)(.)(.)') | |
| return cashedShortHEX[r], cashedShortHEX[g], cashedShortHEX[b] | |
| elseif length == 3 then | |
| local r, g, b = match(hex, '(.)(.)(.)') | |
| return cashedShortHEX[r], cashedShortHEX[g], cashedShortHEX[b] | |
| end | |
| end | |
| end |
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That cashed variant should be faster for short strings, from 1.3 times to 1.7 times on some devices. Checked it in Lua 5.4.3. In Lua 5.3.4 it's slightly faster. (Don't really rely on those numbers, because performance can be very different in some cases and on some devices)