rplace.nim

import nigui, streams

app.init()
type
  ColorId = range[0..15]

# https://www.reddit.com/r/place/comments/62z2uu/rplace_archive_update_and_boardbitmap_description/
proc toRgb(c: ColorId): Color = 
  case c
  of 0: rgb(255, 255, 255)
  of 1: rgb(228, 228, 228)
  of 2: rgb(136, 136, 136)
  of 3: rgb(34, 34, 34)
  of 4: rgb(255, 167, 209)
  of 5: rgb(229, 0, 0)
  of 6: rgb(229, 149, 0)
  of 7: rgb(160, 106, 66)
  of 8: rgb(229, 217, 0)
  of 9: rgb(148, 224, 68)
  of 10: rgb(2, 190, 1)
  of 11: rgb(0, 211, 211)
  of 12: rgb(0, 131, 199)
  of 13: rgb(0, 0, 234)
  of 14: rgb(207, 110, 228)
  of 15: rgb(130, 0, 128)

# File from https://www.reddit.com/r/place/comments/6396u5/rplace_archive_update/
let data = newFileStream("diffs.bin", fmRead)
var resultImage = newImage()
resultImage.resize(1000, 1000)
var pixels: array[1000, array[1000, ColorId]]

while not data.atEnd:
  let
    timestamp = data.readInt32()
    x = data.readInt32()
    y = data.readInt32()
    color = data.readInt32()
  pixels[x][y] = color

data.close()

for x, data in pixels:
  for y, color in data:
    resultImage.canvas.setPixel(x, y, color.toRgb)
  
resultImage.saveToPngFile("out.png")