CJKV Information Processing, 2nd Edition

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Chapter 7: Typography

Horizontal versus vertical Latin, Greek, and Cyrillic textTable 7-14.

Metrics Latin Greek Cyrillic

Adjusted

Prior to OpenType, some fonts would provide separate glyphs for both purposes. Now,

OpenType allows the same glyphs to be used for both purposes, and ‘vmtx’ and ‘VORG’

table settings allow the desired behavior to take place. Each glyph, instead of resting on

the Latin baseline at Y coordinate , is centered along the Y-axis. e full-width “p” glyph

of Adobe Systems’  Pr6N L (KozMinPr6N-Light) font, for example, is adjusted

such that its vertical origin is set at 628 instead of the default value of 880. is has the

eect of raising the glyph. Likewise, the full-width “h” glyph of the same font is adjusted

such that its vertical origin is set at 885, which lowers the glyph ever so slightly. Both of

these adjustments help to ensure that these two glyphs do not collide when set vertically.

Clearly, the only way in which to further improve the result would be to apply propor-

tional metrics to the glyphs. And, some fonts provide such information.

Line Breaking and Word Wrapping

Most CJKV text requires special handling for the beginning and ends of lines, which is

commonly called line breaking, word wrapping, or sometimes hyphenation. In Japanese,

this is referred to as  (kinsoku shori), which literally means “prohibited (char-

acter) processing. ...