* Changes in libotf 0.9.9
** New function OTF_get_variation_glyphs returns glyphs selected by
variation selectors.
** The funciton OTF_drive_cmap handles a variation selector.
** The example program `otfview' can handle variation selectors.
** The function OTF_drive_gpos is obsolte now, and the new function
OTF_drive_gpos2 should be used instead. See the comment of the member
"glyph_id" of type "OTF_Glyph" for the detail.
** If a font doesn't have GDEF table, automatically synthesized GDEF
table is used.
This changes the buildlink3.mk files to use an include guard for the
recursive include. The use of BUILDLINK_DEPTH, BUILDLINK_DEPENDS,
BUILDLINK_PACKAGES and BUILDLINK_ORDER is handled by a single new
variable BUILDLINK_TREE. Each buildlink3.mk file adds a pair of
enter/exit marker, which can be used to reconstruct the tree and
to determine first level includes. Avoiding := for large variables
(BUILDLINK_ORDER) speeds up parse time as += has linear complexity.
The include guard reduces system time by avoiding reading files over and
over again. For complex packages this reduces both %user and %sys time to
half of the former time.
The library "libotf" provides the following facilites.
o Read Open Type Layout Tables from OTF file. Currently these
tables are supported; head, name, cmap, GDEF, GSUB, and GPOS.
o Convert a Unicode character sequence to a glyph code sequence by
using the above tables.
The combination of libotf and the FreeType library (Ver.2) realizes
CTL (complex text layout) by OpenType fonts.
