mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-26 09:28:13 +00:00
83 lines
2.0 KiB
Python
Executable File
83 lines
2.0 KiB
Python
Executable File
#!/usr/bin/env python3
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from PIL import Image
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import sys
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import struct
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import zlib
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def process_rgb(w, h, pix):
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data = bytes()
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for j in range(h):
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for i in range(w):
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r, g, b = pix[i, j]
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c = ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | ((b & 0xF8) >> 3)
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data += struct.pack('>H', c)
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return data
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def process_grayscale(w, h, pix):
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data = bytes()
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for j in range(h):
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for i in range(w // 2):
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l1, l2 = pix[i * 2, j], pix[i * 2 + 1, j]
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c = (l1 & 0xF0) | (l2 >> 4)
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data += struct.pack('>B', c)
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return data
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def process_image(ifn):
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im = Image.open(ifn)
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w, h = im.size
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print('Opened %s ... %d x %d @ %s' % (ifn, w, h, im.mode))
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if im.mode == 'RGB':
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print('Detected RGB mode')
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elif im.mode == 'L':
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if w % 2 > 0:
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print('PNG file must have width divisible by 2')
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return 3
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print('Detected GRAYSCALE mode')
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else:
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print('Unknown mode:', im.mode)
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return 4
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pix = im.load()
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if im.mode == 'RGB':
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ofn = '%s.toif' % ifn[:-4]
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else:
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ofn = '%s.toig' % ifn[:-4]
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with open(ofn, 'wb') as f:
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if im.mode == 'RGB':
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f.write(bytes('TOIf', 'ascii'))
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else:
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f.write(bytes('TOIg', 'ascii'))
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f.write(struct.pack('>HH', w, h))
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if im.mode == 'RGB':
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data = process_rgb(w, h, pix)
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else:
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data = process_grayscale(w, h, pix)
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z = zlib.compressobj(level=9, wbits=10)
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zdata = z.compress(data) + z.flush()
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zdata = zdata[2:-4] # strip header and checksum
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f.write(struct.pack('>I', len(zdata)))
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f.write(zdata)
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print('Written %s ... %d bytes' % (ofn, 4 + 4 + len(zdata)))
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def main():
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if len(sys.argv) < 2:
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print('Usage png2toi image.png')
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return 1
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ifn = sys.argv[1]
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if not ifn.endswith('.png'):
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print('Must provide PNG file')
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return 2
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process_image(ifn)
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main()
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