[luatex] protect_glyph

[Patrick Gundlach]

Hi,

> what is
> subtype(head)

see manual p.173 (glyph node) and chapter 6.1

> and why 256 is important for it ?

good question. The bit field has only 4 bits, so 256 makes no sense for me.


BTW: there seems to be a contradiction in the manual. P. 174 has the following table:

bit meaning
0 character
1 glyph
2 ligature
3 ghost
4 left
5 right


but page 144 states:

bit0   1: char,    0: glyph
bit1   1: ligature 0: no ligature
bit2   1: ghost    0: no ghost
bit3, bit4: rightghost / leftghost

Patrick