Provisional bidi and shaping support

Adds fully working bidirectional text and simple shaping support.
The following works:
- bidirectional text according to the Unicode Bidirectional Algorithm
- simple shaper for mirrored forms (brackets, etc.) according to
  rule L4 of the Unicode Bidirectional Algorithm
- reordering into visual order with correct line wrapping

However, the implementation certainly needs efficiency improvements
(caching, less malloc'ing), a proper shaper (HarfBuzz) needs to be
hooked up and various bugs with karaoke and positioning need to be
fixed.

1 files changed, 1 insertions, 0 deletions

diff --git a/libass/ass_render.h b/libass/ass_render.h
index ea72cd0..8b446e6 100644
--- a/libass/ass_render.h
+++ b/libass/ass_render.h
@@ -137,6 +137,7 @@ typedef struct {
 
 typedef struct {
     double asc, desc;
+    int offset, len;
 } LineInfo;
 
 typedef struct {