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Don't compose Hangul jamo 

See thread "an issue regarding discrepancy between Korean and Unicode
standards" on the mailing list for the rationale.  In short: Uniscribe
doesn't, so fonts are designed to work without it.
This commit is contained in:
Behdad Esfahbod 2013-04-04 23:06:54 -04:00
parent 1f97060985
commit 269de14dda
3 changed files with 5 additions and 13 deletions
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6
src/hb-ot-shape-complex-default.cc
View File

@ -74,12 +74,6 @@ collect_features_default (hb_ot_shape_planner_t *plan)
static hb_ot_shape_normalization_mode_t
normalization_preference_default (const hb_segment_properties_t *props)
{
switch ((hb_tag_t) props->script)
{
/* Unicode-1.1 additions */
case HB_SCRIPT_HANGUL:
return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_FULL;
}
return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS;
}

1
src/hb-ot-shape-normalize-private.hh
View File

@ -41,7 +41,6 @@ enum hb_ot_shape_normalization_mode_t {
HB_OT_SHAPE_NORMALIZATION_MODE_DECOMPOSED,
HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS, /* never composes base-to-base */
HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT, /* always fully decomposes and then recompose back */
HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_FULL, /* including base-to-base composition */
HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT = HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS
};

11
src/hb-ot-shape-normalize.cc
View File

@ -351,12 +351,11 @@ _hb_ot_shape_normalize (const hb_ot_shape_plan_t *plan,
while (buffer->idx < count)
{
hb_codepoint_t composed, glyph;
if (/* If mode is NOT COMPOSED_FULL (ie. it's COMPOSED_DIACRITICS), we don't try to
* compose a non-mark character with it's preceding starter. This is just an
* optimization to avoid trying to compose every two neighboring glyphs in most
* scripts. */
(mode == HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_FULL ||
HB_UNICODE_GENERAL_CATEGORY_IS_MARK (_hb_glyph_info_get_general_category (&buffer->cur()))) &&
if (/* We don't try to compose a non-mark character with it's preceding starter.
* This is both an optimization to avoid trying to compose every two neighboring
* glyphs in most scripts AND a desired feature for Hangul. Apparently Hangul
* fonts are not designed to mix-and-match pre-composed syllables and Jamo. */
HB_UNICODE_GENERAL_CATEGORY_IS_MARK (_hb_glyph_info_get_general_category (&buffer->cur())) &&
/* If there's anything between the starter and this char, they should have CCC
* smaller than this character's. */
(starter == buffer->out_len - 1 ||