68 lines
1.4 KiB
Python
Executable file
68 lines
1.4 KiB
Python
Executable file
#!/usr/bin/env python3
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import sys
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from PIL import Image
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def encode(im):
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pixels = im.load()
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rle = []
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rl = 0
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px = 0
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for y in range(im.height):
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for x in range(im.width):
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newpx = pixels[x, y]
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if newpx == px:
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if rl < 255:
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rl += 1
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else:
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# Handle overflow
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rle.append(255)
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rle.append(0)
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rl = 1
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continue
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# Start a new run
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rle.append(rl)
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rl = 1
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px = newpx
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# Handle the final run
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rle.append(rl)
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return (im.width, im.height, bytes(rle))
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def decode_to_ascii(image):
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(sx, sy, rle) = image
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data = bytearray(2*sx)
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dp = 0
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black = ord('#')
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white = ord(' ')
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color = black
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for rl in rle:
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while rl:
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data[dp] = color
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data[dp+1] = color
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dp += 2
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rl -= 1
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if dp >= (2*sx):
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print(data.decode('utf-8'))
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dp = 0
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if color == black:
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color = white
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else:
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color = black
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# Check the image is the correct length
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assert(dp == 0)
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image = encode(Image.open(sys.argv[1]))
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# This is kinda cool for testing but let's leave this disabled until we add
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# proper argument processing!
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#decode_to_ascii(image)
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print(f'# 1-bit RLE, generated from {sys.argv[1]}')
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print(image)
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