pylib/gp_codegen/pixelsize.py

   1 #
   2 #  gfxprim.pixelsize
   3 #
   4 # 2011 - Tomas Gavenciak <gavento@ucw.cz>
   5 #
   6
   7 LE = "LE"
   8 BE = "BE"
   9
  10 class PixelSize(object):
  11   def __init__(self, size, bit_endian=None, suffix=None):
  12     self.size = size
  13     assert self.size >= 0
  14
  15     self.bit_endian = bit_endian
  16     assert self.bit_endian in [None, LE, BE]
  17     assert (bit_endian is not None) == self.needs_bit_endian()
  18     self.bit_endian_const = "GP_BIT_ENDIAN_" + (self.bit_endian or LE)
  19
  20     self.suffix = suffix
  21     if not self.suffix:
  22       if self.size == 0:
  23         self.suffix = "INVALID"
  24       else:
  25         if bit_endian:
  26           self.suffix = '%dBPP_%s' % (size, bit_endian)
  27         else:
  28           self.suffix = '%dBPP' % (size,)
  29
  30   def needs_bit_endian(self):
  31     return (self.size % 8) != 0
  32
  33   def description(self):
  34     if self.bit_endian:
  35       return "pixel size %d, bit endian %s, suffix %s" % (self.size,
  36         self.bit_endian, self.suffix)
  37     else:
  38       return "pixel size %d, suffix %s" % (self.size, self.suffix)
  39