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[OTLayout] Add note about collect_glyphs() and recursive lookups

This commit is contained in:
Behdad Esfahbod 2013-05-04 16:01:20 -04:00
parent a8bf0e91f1
commit 76ea563673
1 changed files with 7 additions and 1 deletions
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8
src/hb-ot-layout-gsubgpos-private.hh
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@ -158,7 +158,13 @@ struct hb_collect_glyphs_context_t
/* Note that GPOS sets recurse_func to NULL already, so it doesn't get
* past the previous check. For GSUB, we only want to collect the output
* glyphs in the recursion. If output is not requested, we can go home now. */
* glyphs in the recursion. If output is not requested, we can go home now.
*
* Note further, that the above is not exactly correct. A recursed lookup
* is allowed to match input that is not matched in the context, but that's
* not how most fonts are built. It's possible to relax that and recurse
* with all sets here if it proves to be an issue.
*/
if (output == hb_set_get_empty ())
return HB_VOID;