gen/include/pixelsize.py

   1 #
   2 #  gfxprim.pixelsize
   3 #
   4 # 2011 - Tomas Gavenciak <gavento@ucw.cz>
   5 # 2014 - Cyril Hrubis <chrubis@ucw.cz>
   6 #
   7
   8 LE = "LE"
   9 BE = "BE"
  10
  11 class PixelSize(object):
  12   def __init__(self, size, bit_endian=None, suffix=None):
  13     self.size = size
  14     assert self.size >= 0
  15
  16     self.bit_endian = bit_endian
  17     assert self.bit_endian in [None, LE, BE]
  18     assert (bit_endian is not None) == self.needs_bit_endian()
  19     self.bit_endian_const = "GP_BIT_ENDIAN_" + (self.bit_endian or LE)
  20
  21     self.suffix = suffix
  22     if not self.suffix:
  23       if self.size == 0:
  24         self.suffix = "INVALID"
  25       else:
  26         if bit_endian:
  27           self.suffix = '%dBPP_%s' % (size, bit_endian)
  28         else:
  29           self.suffix = '%dBPP' % (size,)
  30
  31   def needs_bit_endian(self):
  32     return (self.size % 8) != 0
  33
  34   def description(self):
  35     if self.bit_endian:
  36       return "pixel size %d, bit endian %s, suffix %s" % (self.size,
  37         self.bit_endian, self.suffix)
  38     else:
  39       return "pixel size %d, suffix %s" % (self.size, self.suffix)
  40