Possible typos in cmap table, subtable format 4

[math1992]

Description

Based on Apple's truetype reference only endCode's last value requires to be 0xFFFF, not startCode. In the opentype specification it reads :

For the search to terminate, the final startCode and endCode values must be 0xFFFF.

In the paragraph below the C expression to compute the glyphId, it reads :

If the idRangeOffset is 0, the idDelta value is added directly to the character code offset (i.e. idDelta[i] + c) to get the corresponding glyph index.

The issue here is that the formula use the character code, not the character code offset.

Page URL

https://learn.microsoft.com/en-us/typography/opentype/spec/cmap

Content source URL

https://github.com/MicrosoftDocs/typography/blob/live/typographydocs/opentype/spec/cmap.md