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caetanus/bitmap_printing.py

Created July 27, 2014 22:14
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bitmap printing for cb55-c
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bitmap_printing.py
def prepare_bitmap(self, bitmap, align="left"):
bitmap = bitmap.convert("1")
width = self._bitmap_res\
if bitmap.size[0] > self._bitmap_res else bitmap.size[0]
height = bitmap.size[1]
if width < bitmap.size[0]:
bitmap = bitmap.crop((0, 0, width, height))
bitmap_output = Image.new("1", (self._bitmap_res, height),
0xFF #background color
)
bitmap.output.paste(bitmap, bitmap.size)
if align == "right":
bitmap_output = bitmap_output.offset(self._bitmap_res - width/2, 0)
elif align == "center":
bitmap_output = bitmap_output.offset(self._bitmap_res/2 - width/2, 0)
page_width = (self._bitmap_res/8)
bitmap_lenght = bitmap_output.size[0] * bitmap_output.size[0]
bitmap_lenght = struct.pack(">H", bitmap_lenght)
out = ["\x1b*%c%s" % (page_width, bitmap_lenght)]
out += map(self.invbyte, bitmap_output.tostring())
output = ''.join(out)
return output
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