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[khmer] Apply ccmp after basic features 

Part of https://github.com/harfbuzz/harfbuzz/issues/974
This commit is contained in:
Behdad Esfahbod 2018-07-31 12:49:02 -07:00
parent 1a96cc825d
commit 7c658ea2f2
1 changed files with 17 additions and 5 deletions
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22
src/hb-ot-shape-complex-khmer.cc
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@ -105,23 +105,35 @@ collect_features_khmer (hb_ot_shape_planner_t *plan)
/* Do this before any lookups have been applied. */
map->add_gsub_pause (setup_syllables);
map->add_gsub_pause (reorder);
map->add_global_bool_feature (HB_TAG('l','o','c','l'));
/* The Indic specs do not require ccmp, but we apply it here since if
* there is a use of it, it's typically at the beginning. */
map->add_global_bool_feature (HB_TAG('c','c','m','p'));
map->add_gsub_pause (nullptr);
unsigned int i = 0;
map->add_gsub_pause (reorder);
for (; i < KHMER_BASIC_FEATURES; i++) {
map->add_feature (khmer_features[i].tag, 1, khmer_features[i].flags | F_MANUAL_ZWJ | F_MANUAL_ZWNJ);
map->add_gsub_pause (nullptr);
}
/* Testing suggests that Uniscribe applies 'ccmp' here, NOT before
* the basic features. Test with KhmerUI.ttf and the following
* three sequences:
*
* U+1789,U+17BC
* U+1789,U+17D2,U+1789
* U+1789,U+17D2,U+1789,U+17BC
*
* https://github.com/harfbuzz/harfbuzz/issues/974
*/
map->add_global_bool_feature (HB_TAG('c','c','m','p'));
map->add_gsub_pause (nullptr);
for (; i < KHMER_NUM_FEATURES; i++) {
map->add_feature (khmer_features[i].tag, 1, khmer_features[i].flags | F_MANUAL_ZWJ | F_MANUAL_ZWNJ);
}
map->add_global_bool_feature (HB_TAG('c','a','l','t'));
map->add_global_bool_feature (HB_TAG('c','l','i','g'));