shaper: always use LTR base direction by default

Unfortunately, VSFilter always assumes LTR base direction. All existing
Arabic subtitles have been designed with that in mind. This causes
various issues, for instance punctuation placed at the wrong side of
a line.

We have no other choice than to use the same braindead always-LTR
assumption (except if overridden by the font encoding property).

1 files changed, 2 insertions, 4 deletions

diff --git a/libass/ass_shaper.c b/libass/ass_shaper.c
index 27c1dad..b666ffb 100644
--- a/libass/ass_shaper.c
+++ b/libass/ass_shaper.c
@@ -716,15 +716,13 @@ FriBidiStrIndex *ass_shaper_reorder(ASS_Shaper *shaper, TextInfo *text_info)
 /**
  * \brief Resolve a Windows font encoding number to a suitable
  * base direction. 177 and 178 are Hebrew and Arabic respectively, and
- * they map to RTL. 1 is autodetection and is mapped to just that.
- * Everything else is mapped to LTR.
+ * they map to RTL. Everything else maps to LTR for compatibility
+ * reasons.
  * \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;