rotate_glyph.py

a = [
        0b10000000,
        0b01000000,
        0b00100000,
        0b00010000,
        0b00011000,
        0b00000100,
        0b00010010,
        0b00010001,
    ]

def printglyph(glyph):
    """Print a glyph defined with rows"""
    for row in glyph:
        s = ""
        for mask in [1 << (7 - bit) for bit in range(0, 8)]:
            bit = row & mask
            s += "X" if bit > 0 else " "
        print s

def rotate(glyph):
    """Rotate a column-defined glyph to column-defined"""
    result = []
    for mask in [1 << (7 - bit) for bit in range(0, 8)]:
        column = 0
        for rowIndex in range(0, 8):
            row = glyph[rowIndex]
            if (row & mask) > 0:
                column |= (1 << (7 - rowIndex))
        result.append(column)
    return result


assert a == rotate(rotate(a))
printglyph(a)