In Arabic it might be preferred to combine the shadda with fatha (0x0651, 0x064E) into a ligature before processing shapes. These two glyphs can then be correctly placed using GPOS. To avoid multiple glyph variants to fit all base glyphs, the character is decomposed into two glyphs.a dot above and a dot below. In Syriac, the character 0x0732 is a combining mark that has a dot above AND a dot below the base character. The feature should be processed as the first feature processed, and should be processed only when it is called. This feature permits such composition/decompostion. Additionally, it may be preferable to compose two characters into a single glyph for better glyph processing. This feature can also be used to substitute ligatures formed using base glyphs and below base matras in Indic scripts.įunction: To minimize the number of glyph alternates, it is sometimes desired to decompose a character into two glyphs. In the Malayalam script (Indic), the conjunct Kla, requires a ligature which is formed using the base glyph Ka and the below-base form of consonant La. Below-base forms are represented by the non-spacing mark glyph.įunction: Produces ligatures that comprise of base glyph and below-base forms.

Consonants in below-base form appear in Bengali syllables after the ones that form the base glyph. Given a sequence Gha, Virama (Halant), Va the below-base form of Va would be substituted to form the conjunct GhVa.įunction: The form that consonants appear below the base glyph. In complex scripts like Oriya (Indic), the consonant Va has a below-base form that is used to generate conjuncts. This mark combines with the consonant Ga to form a ligature.įunction: Substitutes the below-base form of a consonant in conjuncts. In complex scripts like Kannada (Indic), the vowel sign for the vowel I which a mark, is positioned above base consonants.

The above-base form of OE would be substituted to form the correct piece of the letter that is displayed above the base consonant.įunction: Substitutes a ligature for a base glyph and mark that's above it. In complex scripts like Khmer, the vowel OE must be split into a pre-base form and an above-base form. The glyph for ft replaces the sequence f t in Bickham Script, except when preceded by an ascending letter.įunction: Substitutes the above-base form of a vowel. This capability is important in some script designs and for swash ligatures. Unlike other ligature features, clig specifies the context in which the ligature is recommended. Function: Replaces a sequence of glyphs with a single glyph which is preferred for typographic purposes.

Khmer dotted font