#hb_font_t to work upon
The glyph index from which to retrieve the kernings
The #hb_ot_math_kern_t from which to retrieve the kernings
offset of the first kern entry to retrieve
array of kern entries returned
the total number of kern values available or zero
Fetches the raw MathKern (cut-in) data for the specified font, glyph index, and kern. The corresponding list of kern values and correction heights is returned as a list of #hb_ot_math_kern_entry_t structs.
See also #hb_ot_math_get_glyph_kerning, which handles selecting the appropriate kern value for a given correction height.
<note>For a glyph with n defined kern values (where n > 0), there are only n−1 defined correction heights, as each correction height defines a boundary past which the next kern value should be selected. Therefore, only the #hb_ot_math_kern_entry_t.kern_value of the uppermost #hb_ot_math_kern_entry_t actually comes from the font; its corresponding #hb_ot_math_kern_entry_t.max_correction_height is always set to <code>INT32_MAX</code>.</note>