Bits 27-30 Meaning
0 Is an old format mode word (MODE number is in bits 0-6)
1 1 bpp
2 2 bpp
3 4 bpp
4 8 bpp
5 16 bpp (5:5:5 for 32k colours)
6 32 bpp 16M colours in a 32 bit word
7 32 bpp CMYK format
8 24 bpp packed format (allocated to CC)
9 JPEG format (allocated but unused)
10 16 bpp (5:6:5 for 64k colours)
11-14 For future expansion
15 Is a RISC OS 5 sprite type
If bits 27-30 are non-zero, then bits 0-26 and 31 are:
Bit(s) Meaning
0 Takes the value 1, to distinguish this from a so-called mode specifier
1-13 Horizontal dots per inch of sprite
14-26 Vertical dots per inch of sprite. Values of 180 (EX/EY0), 90 (EX/EY1), 45 (EX/EY2), 22.5 stored as 23 or 22 (EX/EY3) are supported.
31 Has a 'wide' 8 bpp alpha mask when set, otherwise 1 bpp binary mask
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