NColor = distinct uint32

ImageObj = object of RootObj
  width*: int
  height*: int
  data*: seq[NColor]

Image = ref ImageObj

proc `$`(color: NColor): string {.raises: [FormatError], tags: [].}

proc `==`(c1, c2: NColor): bool {.raises: [], tags: [].}

proc `[]`(img: Image; row, col: int): NColor {.raises: [], tags: [].}

proc `[]=`(img: Image; row, col: int; val: NColor) {.raises: [], tags: [].}

proc create_image(width, height: int): Image {.raises: [], tags: [].}