83 lines
1.8 KiB
Lua
83 lines
1.8 KiB
Lua
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local args = { ... }
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local ccpi = require("ccpi")
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local bit = {
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band = function(a, b) return a & b end,
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bor = function(a, b) return a | b end,
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blshift = function(a, b) return a << b end,
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brshift = function(a, b) return a >> b end,
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}
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local function write_varint(fp, value)
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value = bit.band(value, 0xFFFFFFFF)
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mask = 0xFFFFFF80
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while true do
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if bit.band(value, mask) == 0 then
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fp:write(string.char(bit.band(value, 0xff)))
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return
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end
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fp:write(string.char(bit.bor(0x80, bit.band(value, 0x7f))))
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value = bit.brshift(value, 7)
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end
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end
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local function write_palette(fp, pal)
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for i = 1, 16 do
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fp:write(string.char(
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bit.brshift(pal[i], 16),
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bit.band(bit.brshift(pal[i], 8), 0xff),
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bit.band(pal[i], 0xff)
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))
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end
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end
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local function write_pixeldata_v0(img, fp)
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for y = 1, img.h do
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for x = 1, img.w do
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fp:write(img.lines[y].s:sub(x, x))
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local bg = tonumber(img.lines[y].bg:sub(x, x), 16)
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local fg = tonumber(img.lines[y].fg:sub(x, x), 16)
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fp:write(string.char(bit.bor(bg, bit.blshift(fg, 4))))
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end
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end
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end
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local fp_out = io.open(table.remove(args, 1), "wb")
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fp_out:write("CPI" .. string.char(0x80))
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local fp = io.open(table.remove(args, 1), "rb")
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print(fp, fp.close)
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local img, err = ccpi.parse({
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read = function(sz) return fp:read(sz) end,
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})
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fp:close()
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if err ~= nil then
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printError(err)
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return
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end
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write_varint(fp_out, img.w)
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write_varint(fp_out, img.h)
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write_varint(fp_out, #args)
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write_palette(fp_out, img.palette)
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write_pixeldata_v0(img, fp_out)
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for i, arg in ipairs(args) do
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print(arg)
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local fp = io.open(arg, "rb")
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img, err = ccpi.parse({
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read = function(sz) return fp:read(sz) end,
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})
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fp:close()
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if err ~= nil then
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printError(err)
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return
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end
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write_palette(fp_out, img.palette)
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write_pixeldata_v0(img, fp_out)
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end
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fp_out:close()
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