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This commit is contained in:
Behdad Esfahbod 2011-07-20 23:59:07 -04:00
parent 498e1a9be6
commit 7b08b0a7f2
2 changed files with 23 additions and 4 deletions
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8
src/hb-ot-shape-complex-arabic.cc
View File

@ -61,25 +61,25 @@ static unsigned int get_joining_type (hb_codepoint_t u, hb_unicode_general_categ
{
/* TODO Macroize the magic bit operations */
if (likely (JOINING_TABLE_FIRST <= u && u <= JOINING_TABLE_LAST)) {
if (likely (hb_codepoint_in_range (u, JOINING_TABLE_FIRST, JOINING_TABLE_LAST))) {
unsigned int j_type = joining_table[u - JOINING_TABLE_FIRST];
if (likely (j_type != JOINING_TYPE_X))
return j_type;
}
/* Mongolian joining data is not in ArabicJoining.txt yet */
if (unlikely (0x1800 <= u && u <= 0x18AF))
if (unlikely (hb_codepoint_in_range (u, 0x1800, 0x18AF)))
{
/* All letters, SIBE SYLLABLE BOUNDARY MARKER, and NIRUGU are D */
if (gen_cat == HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER || u == 0x1807 || u == 0x180A)
return JOINING_TYPE_D;
}
if (unlikely ((u & ~(0x200C^0x200D)) == 0x200C)) {
if (unlikely (hb_codepoint_in_range (u, 0x200C, 0x200D))) {
return u == 0x200C ? JOINING_TYPE_U : JOINING_TYPE_C;
}
return ((1<<gen_cat) & ((1<<HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)|(1<<HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK)|(1<<HB_UNICODE_GENERAL_CATEGORY_FORMAT))) ?
return (FLAG(gen_cat) & (FLAG(HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) | FLAG(HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) | FLAG(HB_UNICODE_GENERAL_CATEGORY_FORMAT))) ?
JOINING_TYPE_T : JOINING_TYPE_U;
}

19
src/hb-private.hh
View File

@ -478,6 +478,25 @@ _hb_trace (const char *what,
}
/* Pre-mature optimization:
* Checks for lo <= u <= hi but with an optimization if lo and hi
* are only different in a contiguous set of lower-most bits.
*/
static inline bool
hb_codepoint_in_range (hb_codepoint_t u, hb_codepoint_t lo, hb_codepoint_t hi)
{
if ( ((lo^hi) & lo) == 0 &&
((lo^hi) & hi) == (lo^hi) &&
((lo^hi) & ((lo^hi) + 1)) == 0 )
return (u & ~(lo^hi)) == lo;
else
return lo <= u && u <= hi;
}
/* Useful for set-operations on small enums */
#define FLAG(x) (1<<(x))
HB_END_DECLS
#endif /* HB_PRIVATE_HH */