mirror of
https://github.com/1bardesign/batteries.git
synced 2024-11-10 02:31:48 +00:00
62 lines
1.7 KiB
Lua
62 lines
1.7 KiB
Lua
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--[[
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colour handling stuff
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feel free to alias to colour
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]]
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local bit = require("bit")
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local band, bor = bit.band, bit.bor
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local lshift, rshift = bit.lshift, bit.rshift
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local colour = {}
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function colour.packRGB(r, g, b)
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local br = lshift(band(0xff, r * 255), 16)
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local bg = lshift(band(0xff, g * 255), 8)
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local bb = lshift(band(0xff, b * 255), 0)
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return bor( br, bg, bb )
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end
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function colour.packARGB(r, g, b, a)
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local ba = lshift(band(0xff, a * 255), 24)
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local br = lshift(band(0xff, r * 255), 16)
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local bg = lshift(band(0xff, g * 255), 8)
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local bb = lshift(band(0xff, b * 255), 0)
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return bor( br, bg, bb, ba )
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end
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function colour.packRGBA(r, g, b, a)
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local br = lshift(band(0xff, r * 255), 24)
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local bg = lshift(band(0xff, g * 255), 16)
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local bb = lshift(band(0xff, b * 255), 8)
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local ba = lshift(band(0xff, a * 255), 0)
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return bor( br, bg, bb, ba )
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end
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function colour.unpackARGB(argb)
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local r = rshift(band(argb, 0x00ff0000), 16) / 255.0
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local g = rshift(band(argb, 0x0000ff00), 8) / 255.0
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local b = rshift(band(argb, 0x000000ff), 0) / 255.0
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local a = rshift(band(argb, 0xff000000), 24) / 255.0
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return r, g, b, a
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end
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function colour.unpackRGBA(rgba)
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local r = rshift(band(rgba, 0xff000000), 24) / 255.0
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local g = rshift(band(rgba, 0x00ff0000), 16) / 255.0
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local b = rshift(band(rgba, 0x0000ff00), 8) / 255.0
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local a = rshift(band(rgba, 0x000000ff), 0) / 255.0
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return r, g, b, a
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end
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function colour.unpackRGB(rgb)
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local r = rshift(band(rgb, 0x00ff0000), 16) / 255.0
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local g = rshift(band(rgb, 0x0000ff00), 8) / 255.0
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local b = rshift(band(rgb, 0x000000ff), 0) / 255.0
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local a = 1.0
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return r, g, b, a
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end
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--todo: hsl, hsv, other colour spaces
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return colour
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