mirror of
https://github.com/sehugg/8bitworkshop.git
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61 lines
1.6 KiB
Python
Executable File
61 lines
1.6 KiB
Python
Executable File
#!/usr/bin/python
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import sys, struct
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# playfield bytes, one array for each of 6 columns
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output = [[],[],[],[],[],[]]
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# reverse byte
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def rev(n):
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return int('{:08b}'.format(n)[::-1], 2)
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# output bits in given range
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def out(i, pix, lb, hb, reverse=0, shift=0):
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x = (pix >> lb) & ((1<<(hb-lb))-1)
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if reverse:
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x = rev(x)
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if shift:
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x = x << shift
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assert(x>=0 and x<=255)
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output[i].append(x)
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# read PBM (binary P4 format) file
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with open(sys.argv[1],'rb') as f:
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# read PBM header
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header = f.readline().strip()
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assert(header == b'P4')
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dims = f.readline().strip()
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if dims[0:1] == b'#':
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dims = f.readline().strip()
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print(dims)
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width,height = list(map(int, dims.split()))
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assert(width==40)
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# read bitmap rows
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for y in range(0,height):
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row = bytes(f.read(5) + b'\0\0\0') # pad to 8 bytes
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# convert bytes from MSB first to LSB first
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row2 = []
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for i in range(0,8):
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row2.append(rev(row[i]))
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# convert to 64-bit integer
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pix = struct.unpack('<q',bytes(row2))[0]
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# generate playfield bytes
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out(0, pix, 0, 4, 0, 4)
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out(1, pix, 4, 12, 1)
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out(2, pix, 12, 20, 0)
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out(3, pix, 20, 24, 0, 4)
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out(4, pix, 24, 32, 1)
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out(5, pix, 32, 40, 0)
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# output bitmap tables
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for c in range(0,6):
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print(("PFBitmap%d" % c))
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s = '\thex '
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for i in range(0,height):
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s += '%02x' % output[c][height-i-1]
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if i % 16 == 15:
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print(s)
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s = '\thex '
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if len(s)>5:
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print(s)
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