Retrospective commit from 2009-10-17.

Continue working on display of R2L glyph rows.  Reverse glyphs in
term.c:append_glyph rather than in extend_face_to_end_of_line.
Fix bidi iteration near BEGV and ZV.

 dispextern.h (struct glyph): New members resolved_level and
 bidi_type.

 xdisp.c (append_glyph, append_composite_glyph)
 (produce_image_glyph, append_stretch_glyph): Set them.

 term.c (append_glyph): Ditto.

 xdisp.c (display_line, next_element_from_buffer): Set the glyph
 row's reversed_p flag if the paragraph base direction is odd.
 (extend_face_to_end_of_line): Don't reverse the glyphs here.

 term.c (append_glyph): Reverse glyphs here.

 bidi.c (bidi_get_next_char_visually): Don't exit early when at ZV.
 (bidi_paragraph_init): Don't step over a newline if at BEGV.
 (bidi_paragraph_init): Handle empty buffers.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/dispextern.h b/src/dispextern.h
index ae6ecbb0d5c..5f18b7f3a4a 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -370,6 +370,13 @@ struct glyph
   /* Non-zero means don't display cursor here.  */
   unsigned avoid_cursor_p : 1;
 
+  /* Resolved bidirection level of the characters [0..63].  */
+  unsigned resolved_level : 6;
+
+  /* Resolved bidirectional type of this character, see enum
+     bidi_type_t below.  */
+  unsigned bidi_type : 5;
+
 #define FACE_ID_BITS    20
 
   /* Face of the glyph.  This is a realized face ID,