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import array
import pprint
def color565(r, g, b):
return (r & 0xf8) << 8 | (g & 0xfc) << 3 | b >> 3
class BMP16:
"""Read 16-color BMP files."""
def __init__(self, filename):
self.filename = filename
self.colors = 0
def read_header(self):
"""Read the file's header information."""
if self.colors:
return
with open(self.filename, 'rb') as f:
f.seek(10)
self.data = int.from_bytes(f.read(4), 'little')
f.seek(18)
self.width = int.from_bytes(f.read(4), 'little')
self.height = int.from_bytes(f.read(4), 'little')
f.seek(46)
self.colors = int.from_bytes(f.read(4), 'little')
def read_palette(self):
"""Read the color palette information."""
palette = array.array('H', (0 for i in range(16)))
with open(self.filename, 'rb') as f:
f.seek(self.data - self.colors * 4)
for color in range(self.colors):
buffer = f.read(4)
c = color565(buffer[2], buffer[1], buffer[0])
palette[color] = ((c & 0xff) << 8) | (c >> 8)
return palette
def read_data(self, offset=0, size=-1):
"""Read the image data."""
with open(self.filename, 'rb') as f:
f.seek(self.data + offset)
return f.read(size)
class Font:
def __init__(self, buffer):
self.buffer = buffer
@classmethod
def from_bmp16(cls, filename):
bmp = BMP16(filename)
bmp.read_header()
if bmp.width != 8 or bmp.height != 1024:
raise ValueError("A 8x1024 16-color BMP expected!")
data = bmp.read_data()
self = cls(bytearray(2048))
c = 0
x = 0
y = 7
for b in data:
self.pixel(c, x, y, b >> 4)
x += 1
self.pixel(c, x, y, b & 0x0f)
x += 1
if x >= 8:
x = 0
y -= 1
if y < 0:
y = 7
c += 1
del data
self.palette = bmp.read_palette()
return self
def pixel(self, c, x, y, color):
index = (127 - c) * 16 + 2 * y + x // 4
bit = (x % 4) * 2
color = color & 0x03
self.buffer[index] |= color << bit
font = Font.from_bmp16("font2.bmp")
pprint.pprint(font.buffer)
pprint.pprint(font.palette.tobytes())
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