Distill the NotoSansCJK otf fonts into something we can use in Asciidoctor PDF (and Asciidoctor EPUB3)

generate-cjk-font.pe

#!/usr/bin/env fontforge

# * 0x90  - Neither OpenType or Apple
# * 0x800 - Generate old-style 'kern' table
# * 0x08  - Exclude TrueType instructions

# For PDF
genflags = 0x90 + 0x08 + 0x800

# For EPUB3
#genflags = 0x90 + 0x08

src_file = $1
dst_file = $1:r + ".ttf"

Open(src_file)
CIDFlatten()
SelectAll()
ClearInstrs()
SelectNone()

# Remove glyphs we'll later truncate to get under glyph limit
SelectMore(0u1f190,0u1f199)
Clear()
SelectNone()

Generate(dst_file, "", genflags)
Close()

Open(dst_file)

# Add missing space glyph
Select(0u00a0)
Copy()
Select(0u0020)
Paste()
SetWidth(0)
SelectNone()

# select lesser range of glyphs
SelectMore(0u0020,0uffee)
SelectInvert()
Clear()
SelectNone()

Generate(dst_file, "", genflags)
Close()