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trezor-firmware/tools/png2toi
2016-09-27 17:19:50 +02:00

43 lines
1016 B
Python
Executable File

#!/usr/bin/env python3
from PIL import Image
import sys
import struct
import zlib
if len(sys.argv) < 2:
print('Usage png2toi image.png')
sys.exit(1)
ifn = sys.argv[1]
if not ifn.endswith('.png'):
print('Must provide PNG file')
sys.exit(2)
im = Image.open(ifn)
w, h = im.size
print('Opened %s ... %d x %d @ %s' % (ifn, w, h, im.mode))
if not im.mode == 'RGB':
print('PNG file must use RGB mode')
sys.exit(3)
pix = im.load()
ofn = '%s.toi' % ifn[:-4]
with open(ofn, 'wb') as f:
f.write(bytes('TOIa', 'ascii'))
f.write(struct.pack('>HH', w, h))
data = bytes()
for j in range(h):
for i in range(w):
r, g, b = pix[i, j]
c = ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | ((b & 0xF8) >> 3)
data += struct.pack('>H', c)
z = zlib.compressobj(level=9, wbits=10)
zdata = z.compress(data) + z.flush()
zdata = zdata[2:-4] # strip header and checksum
f.write(zdata)
print('Written %s ... %d bytes' % (ofn, 4 + 4 + len(zdata)))