Fix GSUB vkna substitution
#4
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The GSUB `vkna` substitutions from CID+16333-CID+16349 (full-width Kana vertical glyphs) to CID+16395-CID+16411 (full-width Kana tuned for vertical writing glyphs) were missing. This commit adds them.
If the GSUB `vkna` substitution is used together with the GSUB `vert` substitution, CID+16236-CID+16252 in `vkna` are not used because they are substituted to other CIDs by `vert`. This commit removes them.
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This request is acceptable. I think this issue will affect not only Adobe-Japan1-7 GSUB files but also Adobe-Japan1-5 and higher. I will double-check which files have impacts carefully. |
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If I understand correctly, the full-width tuned for vertical writing Kana CIDs can be obtained by applying the GSUB substitution both
vertandvknato full-width horizontal Kana CIDs.e.g.
For U+30A1
ァ'KATAKANA LETTER SMALL A', CID+925 is full-width horizontal Kana CID.GSUB
vertsubstitution in aj17-gsub-jp04.fea says the following.Then, GSUB
vknasubstitution in aj17-gsub-jp04.fea says the following.The substitution result, CID+12548 is full-width tuned for vertical writing Kana CID.
However, GSUB
vknasubstitutions do not contain CID+16333-CID+16349 full-width vertical Kana CIDs.Therefore, applying GSUB substitution both
vertandvknato the full-width horizontal Kana, CID+16236-CID+16252, does not obtain the full-width tuned for vertical writing Kana CIDs.e.g.
For U+31F0
ㇰ'KATAKANA LETTER SMALL KU', CID+16236 is Kana full-width horizontal CID.GSUB
vertsubstitution in aj17-gsub-jp04.fea says the following.But, GSUB
vknasubstitution in aj17-gsub-jp04.fea does not contain CID+16333.Then, the substitution result, CID+16333 is not full-width tuned for vertical writing Kana CID.
The correct result is CID+16395 that is full-width tuned for vertical writing Kana CID.
This pull request adds GSUB
vknasubstitutions like the following.So the substitution result will be correct CID+16395.