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31 lines
785 B
Lua
31 lines
785 B
Lua
local M = {}
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local function color_is_bright(r, g, b)
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-- Counting the perceptive luminance - human eye favors green color
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local luminance = (0.299 * r + 0.587 * g + 0.114 * b) / 255
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if luminance > 0.5 then
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return true -- Bright colors, black font
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else
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return false -- Dark colors, white font
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end
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end
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function M.hex2rgb(hex)
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return tonumber("0x" .. hex:sub(1, 2)), tonumber("0x" .. hex:sub(3, 4)), tonumber("0x" .. hex:sub(5, 6))
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end
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function M.assert_brightness(color)
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local hex = color:gsub("#", "")
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local r = M.hex2rgb(string.sub(hex, 1, 2))
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local g = M.hex2rgb(string.sub(hex, 3, 4))
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local b = M.hex2rgb(string.sub(hex, 5, 6))
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if color_is_bright(tonumber(r), tonumber(g), tonumber(b)) == true then
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return true -- bright
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end
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return false -- dull
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end
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return M
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