Formally define the method of interpreting lookups

OpenType / opentype-layout

opentype-layout working group documents

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Formally define the method of interpreting lookups #9

Open be5invis opened 5 years ago

be5invis commented 5 years ago

GSUB
- How are the substitution performed?
- How are the cluster map maintained?
GPOS
- How are the positioning method maintained?

mhosken commented 5 years ago

These questions are too big and vague to be answered directly. Could you break down your questions?

be5invis commented 5 years ago

@mhosken I am referring this question that I twitted: https://twitter.com/belleveinvis/status/1072886672444993537

From @tiroj:

Correct. There's never been an implementation specification for OpenType Layout, only a data format specification. Not only is interpretation of lookups not specified, nor is run segmentation and other dependent or dependency-creating aspects.

From @behdad:

There's an implied algorithm but the fine details are not written down in the standard.