Format of display buffer

enum _PRL_DISPLAY_BUFFER_FORMAT {
  PDBF_NO_CONVERSION = 0,
  PDBF_INDEX8 = 1,
  PDBF_RGB15 = 2,
  PDBF_RGB16 = 3,
  PDBF_RGB24 = 4,
  PDBF_BGR32 = 5,
  PDBF_RGB32 = 6,
  PDBF_YUV422x8 = 10,
  PDBF_YUV422x6 = 11,
  PDBF_YUV422x4 = 12
};