CVSROOT: /cvs/gnome
Module name: pango
Changes by: federico 05/11/07 23:36:11
Modified files:
tools : Makefile.am
Added files:
tools : gen-easy-scripts-table.c
Log message:
2005-11-07 Federico Mena Quintero <[EMAIL PROTECTED]>
Fixes bug #320666 [http://bugzilla.gnome.org/show_bug.cgi?id=320666]:
Instead of doing a bsearch() for every gunichar to map it to a
PangoScript, use a precomputed table for the first 8192 code
points. Also, remember the last script that we computed on each
invocation; this will also help CJK and the other scripts above
U+2000.
This table also holds information on whether the characters in it
are paired characters. We can use this to avoid doing the
expensive get_pair_index() call most of the time.
Many thanks to Matthias Clasen for his suggestions for this patch.
* tools/gen-easy-scripts-table.c: New program to generate
pango_easy_scripts_table.
* tools/Makefile.am: Build gen-easy-scripts-table.
* pango/pango-easy-scripts-table.h: New file with a mapping of the
first 8192 Unicode characters to their corresponding scripts. The
table also says whether each character has a paired char or not.
* pango/Makefile.am (libpango_1_0_la_SOURCES): Add pango-easy-scripts-table.h.
* pango/pango-script-table.h: Remove everything below U+2000, and
add a note to that effect.
* pango/pango-script.c (pango_script_for_unichar_with_last_index):
New function. This is the old pango_script_for_unichar(), but it
lets the caller keep around the computed index in
pango_script_table. This works under the assumption that a
character is likely to be in the same script block as the
preceding character in a string.
(pango_script_for_unichar): First, do a quick check against the
pango_easy_scripts_table. Then, do the expensive check with
pango_script_for_unichar_with_last_index().
(pango_script_iter_next): If the character is within the easy
script range, find out if it is a paired character by using
PANGO_PAIRED_CHAR_FLAG.
(struct _PangoScriptIter): Add a last_index_for_script_lookup
field. We use this to maintain the last-lookup index from
pango_script_for_unichar_with_last_index().
(pango_script_iter_next): If the character is not within the easy
script range, use pango_script_for_unichar_with_last_index(), and
store the index in the last_index_for_script_lookup field of the
PangoScriptIter.
URL :
http://cvs.gnome.org/bonsai/cvsquery.cgi?branch=&dir=pango&who=federico&date=explicit&mindate=2005-11-07%2023:35&maxdate=2005-11-07%2023:37
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