Use region cache to speedup bidi_find_paragraph_start.

* src/buffer.h (struct buffer): New member bidi_paragraph_cache.
Rename cache_long_line_scans to cache_long_scans.
* src/buffer.c (bset_cache_long_line_scans): Rename to
bset_cache_long_scans.
(Fget_buffer_create, Fmake_indirect_buffer, Fkill_buffer)
(Fbuffer_swap_text, init_buffer_once): Take bidi_paragraph_cache
into account.
(syms_of_buffer): Rename cache-long-line-scans to
cache-long-scans.  Adjust docstring.
* src/search.c (newline_cache_on_off):
* src/indent.c (width_run_cache_on_off): Adjust users.
* src/bidi.c (bidi_paragraph_cache_on_off): New function.
(bidi_find_paragraph_start): Use bidi_paragraph_cache if needed.
* src/insdel.c (prepare_to_modify_buffer): Invalidate
bidi_paragraph_cache if enabled.
* doc/lispref/positions.texi (Motion by Screen Lines):
* doc/lispref/display.texi (Truncation): Rename `cache-long-line-scans'
to `cache-long-scans'.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 7b7d9b56cb5..e8c09b3b4f3 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,24 @@
 2013-08-06  Dmitry Antipov  <dmantipov@yandex.ru>
 
+        Use region cache to speedup bidi_find_paragraph_start.
+        * buffer.h (struct buffer): New member bidi_paragraph_cache.
+        Rename cache_long_line_scans to cache_long_scans.
+        * buffer.c (bset_cache_long_line_scans): Rename to
+        bset_cache_long_scans.
+        (Fget_buffer_create, Fmake_indirect_buffer, Fkill_buffer)
+        (Fbuffer_swap_text, init_buffer_once): Take bidi_paragraph_cache
+        into account.
+        (syms_of_buffer): Rename cache-long-line-scans to
+        cache-long-scans.  Adjust docstring.
+        * search.c (newline_cache_on_off):
+        * indent.c (width_run_cache_on_off): Adjust users.
+        * bidi.c (bidi_paragraph_cache_on_off): New function.
+        (bidi_find_paragraph_start): Use bidi_paragraph_cache if needed.
+        * insdel.c (prepare_to_modify_buffer): Invalidate
+        bidi_paragraph_cache if enabled.
+
+2013-08-06  Dmitry Antipov  <dmantipov@yandex.ru>
+
         Invalidate region caches only if buffer text is going to be changed.
         * lisp.h (modify_region_1): Remove 3rd arg and rename to...
         (modify_text): ...new prototype.