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Speed up display of Arabic

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* lisp/language/misc-lang.el (composition-function-table): Move
some of the Arabic composition rules to ZWJ and ZWNJ cells.  This
speeds up display of Arabic by a factor of 2.  (Bug#56682)
This commit is contained in:
Eli Zaretskii 2022-08-06 16:55:51 +03:00
parent 55c25e73d4
commit 5aaad0445d
1 changed files with 6 additions and 3 deletions
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lisp/language/misc-lang.el
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@ -137,10 +137,13 @@ thin (i.e. 1-dot width) space."
(set-char-table-range
composition-function-table
'(#x600 . #x74F)
(list (vector "[\u200C\u200D][\u0600-\u074F\u200C\u200D]+"
1 #'arabic-shape-gstring)
(vector "[\u0600-\u074F\u200C\u200D]+"
(list (vector "[\u0600-\u074F\u200C\u200D]+"
0 #'arabic-shape-gstring)))
(set-char-table-range
composition-function-table
'(#x200C . #x200D)
(list (vector "[\u200C\u200D][\u0600-\u074F\u200C\u200D]+"
0 #'arabic-shape-gstring)))
;; The Egyptian Hieroglyph Format Controls were introduced in Unicode
;; Standard v12.0. Apparently, they are not yet well supported in