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Vertical Substitution Font Feature Selector Constants

Vertical substitution is a glyph substitution in which the glyph for a given glyph code is replaced by an alternate form in a vertical line. (This is not the same as rotating the glyph.) Table D-28 shows the feature selectors for vertical substitution.

Table D-28  Feature selectors for the kVerticalSubstitutionType feature type

Constant

 Explanation
kSubstituteVerticalFormsOnSelector
kSubstituteVerticalFormsOffSelector 		Allows or prevents the substitution of alternate glyph forms in vertical lines.

Figure D-14 illustrates how vertical substitution works.

Figure D-14  Vertical substitution forms in a font

© 2000 Apple Computer, Inc. – (Last Updated 25 Jan 00)