Creates a Bitmap from a PPM (Portable Pixmap) format string.
Bitmap.parsePPM(s)
s
A string containing PPM format image data.
A new Bitmap object containing the parsed image.
let ppm = `P3
2 2
255
255 0 0 255 0 0
255 0 0 255 0 0`
let bitmap = Bitmap.parsePPM(ppm)
bitmap
Supports P3 (ASCII) PPM format only.