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Formally define the method of interpreting lookups #9

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be5invis opened this issue Mar 18, 2019 · 2 comments
Open

Formally define the method of interpreting lookups #9

be5invis opened this issue Mar 18, 2019 · 2 comments

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@be5invis
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  • GSUB
    • How are the substitution performed?
    • How are the cluster map maintained?
  • GPOS
    • How are the positioning method maintained?
@mhosken
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mhosken commented Mar 19, 2019

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

@be5invis
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@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.

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@be5invis @mhosken