Image renderer

os = require("os")
component = require("component")
local io = require("io")


file_in = io.open("input2.txt", "r")
file_data = file_in:read("*all")
file_in:close()

gpu1 = component.proxy(component.get("c295"))

screen = component.proxy(component.get("3bc7"))

gpu1.bind(screen.address)


function ssplit (inputstr, sep)
        if sep == nil then
                sep = "%s"
        end
        local t={}
        for str in string.gmatch(inputstr, "([^"..sep.."]+)") do
                table.insert(t, str)
        end
        return t
end

function get_colour(r_char, g_char, b_char)
  r = math.floor(((string.byte(r_char) - string.byte("!"))/94)*255)
  g = math.floor(((string.byte(g_char) - string.byte("!"))/94)*255)
  b = math.floor(((string.byte(b_char) - string.byte("!"))/94)*255)
  combined = (r << 16) + (g << 8) + b
  -- print(r, g, b, combined)
  return combined
end

function draw_image(to_draw)
  file_sections = ssplit(to_draw, " ")
  image_width = tonumber(file_sections[1])
  data = file_sections[2]
  image_height = string.len(data)/image_width/3
  print(image_width, image_height)
  print(string.len(data))
  -- gpu1.setActiveBuffer(1)
  for y=0,image_height-1,2 do
    for x=0, image_width-1 do
      top_colour_r = y * image_width * 3 + (x*3) + 1
      bottom_colour_r = (y+1) * image_width * 3 + (x*3) + 1
      -- print(top_colour_r)
      colour = get_colour(string.sub(data, top_colour_r, top_colour_r), string.sub(data, top_colour_r+1, top_colour_r+1), string.sub(data, top_colour_r + 2, top_colour_r + 2))
      gpu1.setForeground(colour)
      if bottom_colour_r < string.len(data) then
        colour2 = get_colour(string.sub(data, bottom_colour_r, bottom_colour_r), string.sub(data, bottom_colour_r+1, bottom_colour_r+1), string.sub(data, bottom_colour_r + 2, bottom_colour_r + 2))
        gpu1.setBackground(colour2)
      end
      gpu1.set(x, y/2, "▀")
    end
  end
end

-- draw_image(file_data)