mirror of https://github.com/kepler155c/opus
77 lines
1.9 KiB
Lua
77 lines
1.9 KiB
Lua
local Util = require('util')
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local NFT = { }
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-- largely copied from http://www.computercraft.info/forums2/index.php?/topic/5029-145-npaintpro/
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local tColourLookup = { }
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for n = 1, 16 do
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tColourLookup[string.byte("0123456789abcdef", n, n)] = 2 ^ (n - 1)
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end
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local function getColourOf(hex)
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return tColourLookup[hex:byte()]
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end
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function NFT.parse(imageText)
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local image = {
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fg = { },
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bg = { },
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text = { },
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}
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local num = 1
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local index = 1
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for _,sLine in ipairs(Util.split(imageText)) do
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table.insert(image.fg, { })
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table.insert(image.bg, { })
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table.insert(image.text, { })
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--As we're no longer 1-1, we keep track of what index to write to
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local writeIndex = 1
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--Tells us if we've hit a 30 or 31 (BG and FG respectively)- next char specifies the curr colour
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local bgNext, fgNext = false, false
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--The current background and foreground colours
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local currBG, currFG = nil,nil
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for i = 1, #sLine do
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local nextChar = string.sub(sLine, i, i)
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if nextChar:byte() == 30 then
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bgNext = true
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elseif nextChar:byte() == 31 then
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fgNext = true
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elseif bgNext then
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currBG = getColourOf(nextChar)
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bgNext = false
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elseif fgNext then
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currFG = getColourOf(nextChar)
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fgNext = false
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else
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if nextChar ~= " " and currFG == nil then
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currFG = colours.white
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end
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image.bg[num][writeIndex] = currBG
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image.fg[num][writeIndex] = currFG
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image.text[num][writeIndex] = nextChar
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writeIndex = writeIndex + 1
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end
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end
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image.height = num
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if not image.width or writeIndex - 1 > image.width then
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image.width = writeIndex - 1
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end
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num = num+1
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end
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return image
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end
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function NFT.load(path)
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local imageText = Util.readFile(path)
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if not imageText then
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error('Unable to read image file')
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end
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return NFT.parse(imageText)
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end
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return NFT
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