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[indic] Fix old-spec base-finding logic w vatu feature 

Fixes https://github.com/harfbuzz/harfbuzz/issues/1587
This commit is contained in:
Behdad Esfahbod 2019-12-05 12:19:52 +00:00
parent 0414341ac5
commit b6d0f1529d
1 changed files with 10 additions and 2 deletions
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12
src/hb-ot-shape-complex-indic.cc
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@ -248,6 +248,7 @@ struct indic_shape_plan_t
hb_indic_would_substitute_feature_t pref;
hb_indic_would_substitute_feature_t blwf;
hb_indic_would_substitute_feature_t pstf;
hb_indic_would_substitute_feature_t vatu;
hb_mask_t mask_array[INDIC_NUM_FEATURES];
};
@ -286,6 +287,7 @@ data_create_indic (const hb_ot_shape_plan_t *plan)
indic_plan->pref.init (&plan->map, HB_TAG('p','r','e','f'), zero_context);
indic_plan->blwf.init (&plan->map, HB_TAG('b','l','w','f'), zero_context);
indic_plan->pstf.init (&plan->map, HB_TAG('p','s','t','f'), zero_context);
indic_plan->vatu.init (&plan->map, HB_TAG('v','a','t','u'), zero_context);
for (unsigned int i = 0; i < ARRAY_LENGTH (indic_plan->mask_array); i++)
indic_plan->mask_array[i] = (indic_features[i].flags & F_GLOBAL) ?
@ -315,10 +317,16 @@ consonant_position_from_face (const indic_shape_plan_t *indic_plan,
* base at 0. The font however, only has lookups matching
* 930,94D in 'blwf', not the expected 94D,930 (with new-spec
* table). As such, we simply match both sequences. Seems
* to work. */
* to work.
*
* Vatu is done as well, for:
* https://github.com/harfbuzz/harfbuzz/issues/1587
*/
hb_codepoint_t glyphs[3] = {virama, consonant, virama};
if (indic_plan->blwf.would_substitute (glyphs , 2, face) ||
indic_plan->blwf.would_substitute (glyphs+1, 2, face))
indic_plan->blwf.would_substitute (glyphs+1, 2, face) ||
indic_plan->vatu.would_substitute (glyphs , 2, face) ||
indic_plan->vatu.would_substitute (glyphs+1, 2, face))
return POS_BELOW_C;
if (indic_plan->pstf.would_substitute (glyphs , 2, face) ||
indic_plan->pstf.would_substitute (glyphs+1, 2, face))