term.setGraphicsMode(2)
local w,h = term.getSize(2)
local fb={}
for i=1, h do
    fb[i]={}
    for x=1, w do
        fb[i][x]=0
    end
end

local function setPixel(x,y,c)
    --local old=fb[y]
    --fb[y]=string.sub(old,1,x-1)..string.char(c)..string.sub(old,x+1)
    fb[y][x]=c
end

local function setPixels(x,y,frame)
    local w,h = #fb[1], #fb
    for i=1, #frame do
        for j=1, #frame[i] do
            fb[y+i-1][x+j-1]=frame[i][j]
        end
    end
end

local function getPixel(x,y)
    return fb[y][x]
end

local function getPixels(x,y,w,h)
    local ret={}
    for i=y, y+h do
        ret[#ret+1] = {table.unpack(fb[i], x, x+w)}
    end
    return ret
end

local colors = {
    [0]=0x000000,
    0x0b0b0b,
    0x222222,
    0x444444,
    0x555555,
    0x777777,
    0x888888,
    0xaaaaaa,
    0xbbbbbb,
    0xdddddd,
    0xeeeeee,
    0x00000b,
    0x000022,
    0x000044,
    0x000055,
    0x000077,
    0x000088,
    0x0000aa,
    0x0000bb,
    0x0000dd,
    0x0000ee,
    0x000b00,
    0x002200,
    0x004400,
    0x005500,
    0x007700,
    0x008800,
    0x00aa00,
    0x00bb00,
    0x00dd00,
    0x00ee00,
    0x0b0000,
    0x220000,
    0x440000,
    0x550000,
    0x770000,
    0x880000,
    0xaa0000,
    0xbb0000,
    0xdd0000,
    0xee0000,
    0x000033,
    0x000066,
    0x000099,
    0x0000cc,
    0x0000ff,
    0x003300,
    0x003333,
    0x003366,
    0x003399,
    0x0033cc,
    0x0033ff,
    0x006600,
    0x006633,
    0x006666,
    0x006699,
    0x0066cc,
    0x0066ff,
    0x009900,
    0x009933,
    0x009966,
    0x009999,
    0x0099cc,
    0x0099ff,
    0x00cc00,
    0x00cc33,
    0x00cc66,
    0x00cc99,
    0x00cccc,
    0x00ccff,
    0x00ff00,
    0x00ff33,
    0x00ff66,
    0x00ff99,
    0x00ffcc,
    0x00ffff,
    0x330000,
    0x330033,
    0x330066,
    0x330099,
    0x3300cc,
    0x3300ff,
    0x333300,
    0x333333,
    0x333366,
    0x333399,
    0x3333cc,
    0x3333ff,
    0x336600,
    0x336633,
    0x336666,
    0x336699,
    0x3366cc,
    0x3366ff,
    0x339900,
    0x339933,
    0x339966,
    0x339999,
    0x3399cc,
    0x3399ff,
    0x33cc00,
    0x33cc33,
    0x33cc66,
    0x33cc99,
    0x33cccc,
    0x33ccff,
    0x33ff00,
    0x33ff33,
    0x33ff66,
    0x33ff99,
    0x33ffcc,
    0x33ffff,
    0x660000,
    0x660033,
    0x660066,
    0x660099,
    0x6600cc,
    0x6600ff,
    0x663300,
    0x663333,
    0x663366,
    0x663399,
    0x6633cc,
    0x6633ff,
    0x666600,
    0x666633,
    0x666666,
    0x666699,
    0x6666cc,
    0x6666ff,
    0x669900,
    0x669933,
    0x669966,
    0x669999,
    0x6699cc,
    0x6699ff,
    0x66cc00,
    0x66cc33,
    0x66cc66,
    0x66cc99,
    0x66cccc,
    0x66ccff,
    0x66ff00,
    0x66ff33,
    0x66ff66,
    0x66ff99,
    0x66ffcc,
    0x66ffff,
    0x990000,
    0x990033,
    0x990066,
    0x990099,
    0x9900cc,
    0x9900ff,
    0x993300,
    0x993333,
    0x993366,
    0x993399,
    0x9933cc,
    0x9933ff,
    0x996600,
    0x996633,
    0x996666,
    0x996699,
    0x9966cc,
    0x9966ff,
    0x999900,
    0x999933,
    0x999966,
    0x999999,
    0x9999cc,
    0x9999ff,
    0x99cc00,
    0x99cc33,
    0x99cc66,
    0x99cc99,
    0x99cccc,
    0x99ccff,
    0x99ff00,
    0x99ff33,
    0x99ff66,
    0x99ff99,
    0x99ffcc,
    0x99ffff,
    0xcc0000,
    0xcc0033,
    0xcc0066,
    0xcc0099,
    0xcc00cc,
    0xcc00ff,
    0xcc3300,
    0xcc3333,
    0xcc3366,
    0xcc3399,
    0xcc33cc,
    0xcc33ff,
    0xcc6600,
    0xcc6633,
    0xcc6666,
    0xcc6699,
    0xcc66cc,
    0xcc66ff,
    0xcc9900,
    0xcc9933,
    0xcc9966,
    0xcc9999,
    0xcc99cc,
    0xcc99ff,
    0xcccc00,
    0xcccc33,
    0xcccc66,
    0xcccc99,
    0xcccccc,
    0xccccff,
    0xccff00,
    0xccff33,
    0xccff66,
    0xccff99,
    0xccffcc,
    0xccffff,
    0xff0000,
    0xff0033,
    0xff0066,
    0xff0099,
    0xff00cc,
    0xff00ff,
    0xff3300,
    0xff3333,
    0xff3366,
    0xff3399,
    0xff33cc,
    0xff33ff,
    0xff6600,
    0xff6633,
    0xff6666,
    0xff6699,
    0xff66cc,
    0xff66ff,
    0xff9900,
    0xff9933,
    0xff9966,
    0xff9999,
    0xff99cc,
    0xff99ff,
    0xffcc00,
    0xffcc33,
    0xffcc66,
    0xffcc99,
    0xffcccc,
    0xffccff,
    0xffff00,
    0xffff33,
    0xffff66,
    0xffff99,
    0xffffcc,
    0xffffff,
}

for i=0,255 do
    term.setPaletteColor(i,colors[i])
end
term.drawPixels(0,0,fb)

for i=0,255 do
    for y=1+i, h-i do
        for x=1+i, w-i do
            setPixel(x,y,i)
        end
    end
    term.drawPixels(1,1,fb)
    os.queueEvent("nosleep")
    os.pullEvent()
end

for i=1, 1000 do
    pcall(function()
        setPixels(math.random(1,w),math.random(1,h),getPixels(math.random(1,w),math.random(1,h),math.random(1,w),math.random(1,h)))
    end)
    term.drawPixels(1,1,fb)
    os.queueEvent("nosleep")
    os.pullEvent()
end
setPixels(1,1,getPixels(w-50,h-50,50,50))
term.drawPixels(0,0,fb)

local i=0
for x=1, 16*4, 4 do
    for y=1, 16*4, 4 do
        setPixel(x,y,i)
        setPixel(x+1,y,i)
        setPixel(x+2,y,i)
        setPixel(x+3,y,i)
        setPixel(x,y+1,i)
        setPixel(x+1,y+1,i)
        setPixel(x+2,y+1,i)
        setPixel(x+3,y+1,i)
        setPixel(x,y+2,i)
        setPixel(x+1,y+2,i)
        setPixel(x+2,y+2,i)
        setPixel(x+3,y+2,i)
        setPixel(x,y+3,i)
        setPixel(x+1,y+3,i)
        setPixel(x+2,y+3,i)
        setPixel(x+3,y+3,i)
        i=i+1
    end
end
term.drawPixels(0,0,fb)

sleep(5)
term.setGraphicsMode(false)