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Emoji skin tone modifiers need to be treated as combining marks 

Fixes https://github.com/behdad/harfbuzz/issues/169
This commit is contained in:
Behdad Esfahbod 2016-02-18 17:06:25 +07:00
parent da41e48f0a
commit aae2847099
2 changed files with 17 additions and 3 deletions
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15
src/hb-ot-layout-private.hh
View File

@ -256,8 +256,11 @@ _hb_glyph_info_set_unicode_props (hb_glyph_info_t *info, hb_buffer_t *buffer)
if (u == 0x200Cu) props |= UPROPS_MASK_ZWNJ;
if (u == 0x200Du) props |= UPROPS_MASK_ZWJ;
}
else if (unlikely (HB_UNICODE_GENERAL_CATEGORY_IS_NON_ENCLOSING_MARK (gen_cat)))
else if (unlikely (HB_UNICODE_GENERAL_CATEGORY_IS_NON_ENCLOSING_MARK_OR_MODIFIER_SYMBOL (gen_cat)))
{
/* The above check is just an optimization to let in only things we need further
* processing on. */
/* Only Mn and Mc can have non-zero ccc:
* http://www.unicode.org/policies/stability_policy.html#Property_Value
* """
@ -272,6 +275,16 @@ _hb_glyph_info_set_unicode_props (hb_glyph_info_t *info, hb_buffer_t *buffer)
* the "else if".
*/
props |= unicode->modified_combining_class (info->codepoint)<<8;
/* Recategorize emoji skin-tone modifiers as Unicode mark, so they
* behave correctly in non-native directionality. They originally
* are MODIFIER_SYMBOL. Fixes:
* https://github.com/behdad/harfbuzz/issues/169
*/
if (unlikely (hb_in_range (u, 0x1F3FBu, 0x1F3FFu)))
{
props = gen_cat = HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK;
}
}
}

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

@ -357,9 +357,10 @@ 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) \
#define HB_UNICODE_GENERAL_CATEGORY_IS_NON_ENCLOSING_MARK_OR_MODIFIER_SYMBOL(gen_cat) \
(FLAG_SAFE (gen_cat) & \
(FLAG (HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK) | \
FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)))
FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) | \
FLAG (HB_UNICODE_GENERAL_CATEGORY_MODIFIER_SYMBOL)))
#endif /* HB_UNICODE_PRIVATE_HH */