ScreenBackup.lua

local func = table.unpack({...})

local gpu = require("component").gpu

local w, h = gpu.getResolution()

local scr = {}

for i = 1, w do

  scr[i] = {}

  for j = 1, h do

    scr[i][j] = {gpu.get(i, j)}

  end

end

func()

for i = 1, w do

  for j = 1, h do

    local symbol = {gpu.get(i, j)}

    if symbol[1] ~= scr[i][j][1] or symbol[2] ~= scr[i][j][2] or symbol[3] ~= scr[i][j][3] then

      if gpu.getBackground ~= scr[i][j][3] then gpu.setBackground(scr[i][j][3]) end
      if gpu.getForeground ~= scr[i][j][2] then gpu.setForeground(scr[i][j][2]) end

      gpu.set(i, j, scr[i][j][1])

    end

  end

end