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Create fifvm-buffer-microptimized.lua #1

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92 changes: 92 additions & 0 deletions fifvm-buffer-microptimized.lua
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Original file line number Diff line number Diff line change
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local gpu = require('component').gpu

local gpu_set, gpu_setbg, gpu_setfg, gpu_fill,gpu_bitblt = gpu.set, gpu.setBackground, gpu.setForeground, gpu.fill, gpu.bitblt
local unicode_char = require('unicode').char
local string_sub, string_byte = string.sub, string.byte
local table_concat = table.concat

local handle = io.open((...) or (function() print("No input file provided") return os.exit() end)(), "rb")

handle:read(6)
local w,h = string_byte(handle:read(1)), string_byte(handle:read(1))
gpu.setResolution(w,h)
local buff = gpu.allocateBuffer(w, h)
gpu.setActiveBuffer(buff)

local i = 1
local data = {}
while true do
local s = handle:read(1024)
if s ~= nil then
data[i] = s
i = i + 1
else break end
end
data = table_concat(data)

local offset = 1
local gpustring = {} -- reusage
local function generatePI(pixelInfo)
local len = #pixelInfo
local gpustring = gpustring
for i=1,len do
gpustring[i] = unicode_char(string_byte(string_sub(pixelInfo, i, i)) + 0x2800)
end
return table_concat(gpustring,"",1,len)
end

while true do
local instruction = string_byte(string_sub(data, offset, offset), 1)
offset = offset + 1
if instruction == 0x01 then
local data = string_sub(data, offset, offset + 2)
offset = offset + 3
gpu_setbg(
string_byte(data, 1) * 0x10000 + -- r
string_byte(data, 2) * 0x100 + -- g
string_byte(data, 3) ) -- b
elseif instruction == 0x02 then
local data = string_sub(data, offset, offset + 2)
offset = offset + 3
gpu_setfg(
string_byte(data, 1) * 0x10000 + -- r
string_byte(data, 2) * 0x100 + -- g
string_byte(data, 3) ) -- b
elseif instruction == 0x10 then
local cords = string_sub(data, offset, offset + 1)
offset = offset + 2
local size = string_byte(string_sub(data, offset, offset))
offset = offset + 1
gpu_set(
string_byte(cords, 1) + 1, -- x
string_byte(cords, 2) + 1, -- y
generatePI(string_sub(data, offset, offset + size - 1))) -- string
offset = offset + size
elseif instruction == 0x11 then
local cords = string_sub(data, offset, offset + 4)
offset = offset + 5
gpu_fill(
string_byte(cords, 1) + 1, -- x
string_byte(cords, 2) + 1, -- y
string_byte(cords, 3), -- w
string_byte(cords, 4), -- h
unicode_char(0x2800 + string_byte(cords, 5))) -- filler
elseif instruction == 0x12 then
offset = offset + 1
gpu_bitblt(0, 1, 1, w, h, buff)
elseif instruction == 0x13 then
local cords = string_sub(data, offset ,offset + 1)
offset = offset + 2
local size = string_byte(string_sub(data,offset,offset))
offset = offset + 1
gpu.set(
string_byte(cords, 1) + 1, -- x
string_byte(cords, 2) + 1, -- y
generatePI(string_sub(data, offset, offset + size - 1)), true) -- string, isVertical
offset = offset + size
elseif instruction == 0x20 then break end
end

gpu.setActiveBuffer(0)
gpu_bitblt(0, 1, 1, w, h, buff)
gpu.freeBuffer(buff)