new_contents: from PyQt5.QtGui import qRgb
  from idacyber import ColorFilter
  
  class Ascii(ColorFilter):
      name = 'Ascii'
      highlight_cursor = True
      help = ''
  
      def render_img(self, buf, addr, mouse_offs):
          colors = []
          last_offs = None
          cur_len = 0
          offsets = {}
          min_len = 5
          for i in xrange(len(buf)):           
              c = ord(buf[i])
              r = 0
              printable = c >= 0x20 and c <= 0x7E
              if printable:
                  if last_offs is not None:
                      cur_len += 1
                  else:
                      last_offs = i
                      cur_len = 1
              else:
                  if last_offs is not None and cur_len >= min_len:
                      offsets[last_offs] = cur_len
                  last_offs = None
                  cur_len = 0
              colors.append(qRgb(0x10, 0x10, 0x10))
  
          for k, v in offsets.iteritems():
              for i in xrange(v):
                      c = ord(buf[k+i])
                      b = c + (0xFF - 0x7E)
                      if c >= 0x41 and c <= 0x5A or \
                      c >= 0x61 and c <= 0x7A or \
                      c >= 0x30 and c <= 0x39:
                          colors[k+i] = qRgb(b, b, 0)
                      else:
                          colors[k+i] = qRgb(b, 0, 0)
  
          return colors
      
  def FILTER_ENTRY():
      return Ascii()
  
subject: add ascii color filter