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Tighten ccc-setting a bit and document it

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This commit is contained in:
Behdad Esfahbod 2015-11-03 12:58:12 -08:00
parent 2f0dfd43cd
commit 90d75f93bb
2 changed files with 16 additions and 1 deletions
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12
src/hb-ot-layout-private.hh
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@ -235,8 +235,18 @@ _hb_glyph_info_set_unicode_props (hb_glyph_info_t *info, hb_unicode_funcs_t *uni
if (u == 0x200Cu) props |= UPROPS_MASK_ZWNJ;
if (u == 0x200Du) props |= UPROPS_MASK_ZWJ;
}
else if (unlikely (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (gen_cat)))
else if (unlikely (HB_UNICODE_GENERAL_CATEGORY_IS_NON_ENCLOSING_MARK (gen_cat)))
{
/* Only Mn and Mc can have non-zero ccc:
* http://www.unicode.org/policies/stability_policy.html#Property_Value
* """
* Canonical_Combining_Class, General_Category
* All characters other than those with General_Category property values
* Spacing_Mark (Mc) and Nonspacing_Mark (Mn) have the Canonical_Combining_Class
* property value 0.
* 1.1.5+
* """
*/
props |= unicode->modified_combining_class (info->codepoint)<<8;
}
}

5
src/hb-unicode-private.hh
View File

@ -313,5 +313,10 @@ extern HB_INTERNAL const hb_unicode_funcs_t _hb_unicode_funcs_nil;
FLAG (HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) | \
FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)))
#define HB_UNICODE_GENERAL_CATEGORY_IS_NON_ENCLOSING_MARK(gen_cat) \
(FLAG_SAFE (gen_cat) & \
(FLAG (HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK) | \
FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)))
#endif /* HB_UNICODE_PRIVATE_HH */