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Fix cursor motion slowdown at the beginning of buffer.

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src/xdisp.c (compute_display_string_pos): Fix logic of caching
 previous display string position.  Initialize cached_prev_pos to -1.
This commit is contained in:
Eli Zaretskii 2011-07-24 21:19:10 +03:00
parent 8719d1dcad
commit 7daee9109e
2 changed files with 14 additions and 4 deletions
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6
src/ChangeLog
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@ -1,3 +1,9 @@
2011-07-24 Eli Zaretskii <eliz@gnu.org>
* xdisp.c (compute_display_string_pos): Fix logic of caching
previous display string position. Initialize cached_prev_pos to
-1. Fixes slow-down at the beginning of a buffer.
2011-07-23 Eli Zaretskii <eliz@gnu.org>
* xdisp.c (move_it_in_display_line_to): Record the best matching

12
src/xdisp.c
View file

@ -3140,7 +3140,7 @@ next_overlay_change (EMACS_INT pos)
/* Record one cached display string position found recently by
compute_display_string_pos. */
static EMACS_INT cached_disp_pos;
static EMACS_INT cached_prev_pos;
static EMACS_INT cached_prev_pos = -1;
static struct buffer *cached_disp_buffer;
static int cached_disp_modiff;
static int cached_disp_overlay_modiff;
@ -3190,18 +3190,22 @@ compute_display_string_pos (struct text_pos *position,
&& BUF_MODIFF (b) == cached_disp_modiff
&& BUF_OVERLAY_MODIFF (b) == cached_disp_overlay_modiff)
{
if (cached_prev_pos
if (cached_prev_pos >= 0
&& cached_prev_pos < charpos && charpos <= cached_disp_pos)
return cached_disp_pos;
/* Handle overstepping either end of the known interval. */
if (charpos > cached_disp_pos)
cached_prev_pos = cached_disp_pos;
else /* charpos <= cached_prev_pos */
cached_prev_pos = max (charpos - 1, BEGV);
cached_prev_pos = max (charpos - 1, 0);
}
/* Record new values in the cache. */
cached_disp_buffer = b;
if (b != cached_disp_buffer)
{
cached_disp_buffer = b;
cached_prev_pos = max (charpos - 1, 0);
}
cached_disp_modiff = BUF_MODIFF (b);
cached_disp_overlay_modiff = BUF_OVERLAY_MODIFF (b);
}