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- #!/usr/bin/env python3
- from PIL import Image
- from sys import argv,stderr
- assert len(argv) > 2, "Usage:\n\t{} input_file output_file".format(argv[0])
- CHARACTER_WIDTH = 9
- CHARACTER_HEIGHT = 8
- with Image.open(argv[1]) as img:
- bg_color = img.getpixel((0, 0))
- fg_color = img.getpixel((1, 0))
- null_color = img.getpixel((2, 0))
- width, height = img.size
- assert width % CHARACTER_WIDTH == 0, f"The source image's width must be a multiple of {CHARACTER_WIDTH}!"
- assert height % CHARACTER_HEIGHT == 1, f"The source image's height must be a multiple of {CHARACTER_HEIGHT}, plus 1!"
- data = []
- for ty in range(0, height - 1, CHARACTER_HEIGHT):
- for tx in range(0, width, CHARACTER_WIDTH):
- size = 0
- for y in range(ty + 1, ty + 1 + CHARACTER_HEIGHT):
- byte = 0
- size = CHARACTER_WIDTH
- for x in range(tx, tx + CHARACTER_WIDTH):
- byte <<= 1
- pixel = img.getpixel((x, y))
- if pixel == fg_color:
- byte |= 1
- elif pixel == null_color:
- size -= 1
- elif pixel != bg_color:
- print(f"WARNING: pixel at (x:{x}, y:{y}) is none of the 3 font pixels; treating as blank. Note: only monochrome fonts are supported!", file=stderr)
- if byte & (1 << (CHARACTER_WIDTH - 8) - 1):
- raise ValueError(f"Row at (x:{tx}, y:{y}): only the first 8 pixels of a character can be non-blank!")
- data.append(byte >> (CHARACTER_WIDTH - 8))
- data.append(size)
- with open(argv[2], "wb") as output:
- output.write(bytes(data))
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