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-rw-r--r--libass/ass_shaper.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/libass/ass_shaper.c b/libass/ass_shaper.c
index b666ffb..89ea97a 100644
--- a/libass/ass_shaper.c
+++ b/libass/ass_shaper.c
@@ -714,15 +714,18 @@ FriBidiStrIndex *ass_shaper_reorder(ASS_Shaper *shaper, TextInfo *text_info)
}
/**
- * \brief Resolve a Windows font encoding number to a suitable
+ * \brief Resolve a Windows font charset number to a suitable
* base direction. 177 and 178 are Hebrew and Arabic respectively, and
* they map to RTL. Everything else maps to LTR for compatibility
- * reasons.
+ * reasons. The special value -1, which is not a legal Windows font charset
+ * number, can be used for autodetection.
* \param enc Windows font encoding
*/
FriBidiParType resolve_base_direction(int enc)
{
switch (enc) {
+ case -1:
+ return FRIBIDI_PAR_ON;
case 177:
case 178:
return FRIBIDI_PAR_RTL;