ConstReadonlyARGB1555: 25Packed 1/5/5/5 ARGB.
ReadonlyARGB4444: 26Packed 4/4/4/4 ARGB.
ReadonlyARGB8: 21D3DFMT_A8R8G8B8, stored as B/G/R/A bytes.
ReadonlyDXT1: 827611204BC1 blocks with optional binary alpha.
ReadonlyDXT3: 861165636BC2 blocks with explicit four-bit alpha.
ReadonlyDXT5: 894720068BC3 blocks with interpolated alpha.
ReadonlyRGB565: 23Packed 5/6/5 RGB.
ReadonlyRGB8: 20D3DFMT_R8G8B8, stored as B/G/R bytes.
ReadonlyXRGB1555: 24Packed unused-bit/5/5/5 RGB.
ReadonlyXRGB8: 22D3DFMT_X8R8G8B8 with unused high byte.
D3DFMT codes or little-endian ASCII fourCC values used by NTF textures.