starfall img viewer (broken)

--@client

local function perf(threshold)
    return math.max(quotaAverage(), quotaUsed()) < quotaMax()*threshold
end

-- Music
local succ, ret = pcall(function()
    bass.loadFile("pixels/music.ogg", "mono", function(obj, errno, errtxt)
        if obj then
            music = obj
        else
            errmsg = errtxt
        end
    end)
end)
if not succ then
    errmsg = tostring(ret)
end

-- Define colors
colors = {
    ["\xff\xff\xff"] = Color(255, 255, 255),
    ["\x00\x00\x00"] = Color(0, 0, 0),
    ["\xff\x5f\x00"] = Color(255, 95, 0),
    ["\xff\xbf\x00"] = Color(255, 191, 0),
    ["\xdf\xff\x00"] = Color(223, 255, 0),
    ["\x7f\xff\x00"] = Color(127, 255, 0),
    ["\x1f\xff\x00"] = Color(31, 255, 0),
    ["\x00\xff\x3f"] = Color(0, 255, 63),
    ["\x00\xff\x9f"] = Color(0, 255, 159),
    ["\x00\xff\xff"] = Color(0, 255, 255),
    ["\x00\x9f\xff"] = Color(0, 159, 255),
    ["\x00\x3f\xff"] = Color(0, 63, 255),
    ["\x1f\x00\xff"] = Color(31, 0, 255),
    ["\x7f\x00\xff"] = Color(127, 0, 255),
    ["\xdf\x00\xff"] = Color(223, 0, 255),
    ["\xff\x00\xbf"] = Color(255, 0, 191),
    ["\xff\x00\x5f"] = Color(255, 0, 95),
    ["\xff\x00\x00"] = Color(255, 0, 0),
    ["\x7f\x7f\x7f"] = Color(127, 127, 127)
}

-- Load image
local img = string.explode("\n", file.read("pixels/test_bars_h_big.ppm"))
for i=1, #img-1 do
    if img[i][1] == "#" then
        table.remove(img, i)
    end
end
if img[1] ~= "P6" then error("Bad image header") end
w, h = unpack(string.explode(" ", img[2]))
w, h = tonumber(w), tonumber(h)
if not (w and h) then error("Could not read image dimensions") end
if img[3] ~= "255" then error("Bad image byte size") end
if #img ~= 4 then error("Too many newlines in image") end
img_proc = {}
--img[4] = string.rep("abcdefghi", w*h/3)
for x=1, h do
    img_proc[x] = {}
    for y=1, w do
        local pos = (x*y)*3
        img_proc[x][y] = colors[string.sub(img[4], pos-2, pos)] or Color(31, 31, 31)
    end
end
--printTable(img_proc[1])

-- Render
hook.add("render", "init", function()
    local rt = render.createRenderTarget("rt")
    local size = 1024/math.max(w, h)
    render.selectRenderTarget("rt")
    for x=1, h do
        --if not perf(0.9) then break end
        for y=1, w do
            render.setColor(img_proc[x][y])
            render.drawRect(size*y, size*x, size, size)
        end
    end
    render.selectRenderTarget()
    hook.remove("render", "init")
end)

hook.add("render", "render", function()
    render.setRGBA(255, 255, 255, 255)
    render.drawRectFast(0, 0, 512, 512)
    render.setRenderTargetTexture("rt")
    render.drawTexturedRectFast(0, 0, 512, 512)
    render.setRenderTargetTexture()
end)