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[indic] Allow context when matching for Malayalam new-spec 

Test sequence:
	U+0995,U+09CD,U+09B0

With Nirmala shipped on Windows 10, this failed to form the below form.
Works now.

Reported by Sairus.
This commit is contained in:
Behdad Esfahbod 2015-12-17 17:31:17 +00:00
parent eaf1e93ef1
commit 508cc3d3cf
1 changed files with 9 additions and 2 deletions
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11
src/hb-ot-shape-complex-indic.cc
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@ -557,8 +557,15 @@ data_create_indic (const hb_ot_shape_plan_t *plan)
indic_plan->virama_glyph = (hb_codepoint_t) -1; indic_plan->virama_glyph = (hb_codepoint_t) -1;
/* Use zero-context would_substitute() matching for new-spec of the main /* Use zero-context would_substitute() matching for new-spec of the main
* Indic scripts, and scripts with one spec only, but not for old-specs. */ * Indic scripts, and scripts with one spec only, but not for old-specs.
bool zero_context = !indic_plan->is_old_spec; * The new-spec for all dual-spec scripts says zero-context matching happens.
*
* However, testing with Malayalam shows that old and new spec both allow
* context. Testing with Bengali new-spec however shows that it doesn't.
* So, the heuristic here is the way it is. It should *only* be changed,
* as we discover more cases of what Windows does. DON'T TOUCH OTHERWISE.
*/
bool zero_context = !indic_plan->is_old_spec && plan->props.script != HB_SCRIPT_MALAYALAM;
indic_plan->rphf.init (&plan->map, HB_TAG('r','p','h','f'), zero_context); indic_plan->rphf.init (&plan->map, HB_TAG('r','p','h','f'), zero_context);
indic_plan->pref.init (&plan->map, HB_TAG('p','r','e','f'), zero_context); 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->blwf.init (&plan->map, HB_TAG('b','l','w','f'), zero_context);