M+ fonts are generated from the M+ outline fonts TESTFLIGHT 63a retrieved from mplus-fonts.osdn.jp/mplus-outline-fonts/download/index-en.html.
The following changes were made using fontforge to produce mplus1p-regular-fallback.ttf font:
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Subsetted to include:
** Non-visible Characters (U+00a0) ** Basic Latin (U+0020–U+007e) ** Latin-1 Supplement (U+00a0–U+00fd) ** Latin Extended-A (U+0100–U+017f) ** Latin Extended-B (U+0180–U+024f) ** IPA (U+0259, U+02b0–U+02ff) ** Greek (U+0370–U+03ff) ** Cyrillic (U+0400–U+04ff) ** Vietnamese (U+01a0–U01b0, U+1ea0–U1ef9) ** CJK (U+4e00–U+9fff, U+3000–U+303f) (mostly Japanese, limited selection based on what M+ supports) ** Mathematical Operators (U+2200–U+22ff, U+2116) ** General Punctuation (U+2000–U203a) ** Geometric Shapes (U+25a0–U25ff) ** Assorted Symbols (U+20ac, U+2122, U+21d0–U+21d5, U+2190–U+2195, U+2610–U+2611, U+2713–U+2714) ** .notdef glyph
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Added BOM (U+feff), hair space (U+200a), zero-width space (U+200b) and line feed (U+000a) characters (from blank)
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Manually added non-breaking hyphen (U+2011) from hyphen (U+002d)
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Generated old-style kern table (neither Apple or OpenType) (required to make kerning work in Prawn) (flags: 0x90)
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Removed Truetype instructions (information not used by Prawn) (flags: 0x08)
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Generated with PS Glyph Names option enabled (didn't use 0x04 flag)
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Generate flags used, in total: 0x90 + 0x08