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More rewriting plan compile 

Hopefully more clear.
This commit is contained in:
Behdad Esfahbod 2018-10-10 10:49:45 -04:00
parent 961ab46b24
commit d1be805e78
2 changed files with 39 additions and 17 deletions
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55
src/hb-ot-shape.cc
View File

@ -59,29 +59,54 @@ hb_ot_shape_planner_t::compile (hb_ot_shape_plan_t &plan,
hb_tag_t kern_tag = HB_DIRECTION_IS_HORIZONTAL (plan.props.direction) ?
HB_TAG ('k','e','r','n') : HB_TAG ('v','k','r','n');
plan.kern_mask = plan.map.get_mask (kern_tag);
plan.kerning_requested = !!plan.kern_mask;
bool kerning_requested = !!plan.kern_mask;
bool has_gpos_kern = plan.map.get_feature_index (0, kern_tag) != HB_OT_LAYOUT_NO_FEATURE_INDEX;
bool disable_gpos = plan.shaper->gpos_tag &&
plan.shaper->gpos_tag != plan.map.chosen_script[1];
/* Decide who provides glyph classes. GDEF or Unicode. */
plan.fallback_glyph_classes = !hb_ot_layout_has_glyph_classes (face);
/*
* Decide who provides glyph classes. GDEF or Unicode.
*/
/* Decide who does substitutions. GSUB, morx, or fallback. */
plan.apply_morx = !hb_ot_layout_has_substitution (face) &&
hb_aat_layout_has_substitution (face);
if (!hb_ot_layout_has_glyph_classes (face))
plan.fallback_glyph_classes = true;
/* Decide who does positioning. GPOS, kerx, kern, or fallback. */
plan.apply_gpos = !disable_gpos && hb_ot_layout_has_positioning (face);
plan.apply_kerx = !plan.apply_gpos &&
hb_aat_layout_has_positioning (face);
/*
* Decide who does substitutions. GSUB, morx, or fallback.
*/
plan.apply_kern = !has_gpos_kern && !plan.apply_kerx && hb_ot_layout_has_kerning (face);
plan.fallback_kerning = !has_gpos_kern && !plan.apply_kerx && !plan.apply_kern;
if (!hb_ot_layout_has_substitution (face))
{ /* No GSUB. */
if (hb_aat_layout_has_substitution (face))
plan.apply_morx = true;
}
/*
* Decide who does positioning. GPOS, kerx, kern, or fallback.
*/
if (!disable_gpos && hb_ot_layout_has_positioning (face))
plan.apply_gpos = true;
else if (hb_aat_layout_has_positioning (face))
plan.apply_kerx = true;
if (kerning_requested)
{
if (plan.apply_kerx)
;/* kerx supercedes kern. */
else if (!has_gpos_kern)
{
if (hb_ot_layout_has_kerning (face))
plan.apply_kern = true;
else
plan.fallback_kerning = true;
}
}
plan.has_gpos_mark = !!plan.map.get_1_mask (HB_TAG ('m','a','r','k'));
plan.fallback_mark_positioning = !plan.apply_gpos;
if (!plan.apply_gpos)
plan.fallback_mark_positioning = true;
}
@ -844,9 +869,7 @@ hb_ot_position (const hb_ot_shape_context_t *c)
/* Visual fallback goes here. */
if (!c->plan->kerning_requested)
;
else if (c->plan->apply_kern)
if (c->plan->apply_kern)
hb_ot_layout_kern (c->font, c->buffer, c->plan->kern_mask);
else if (c->plan->fallback_kerning)
_hb_ot_shape_fallback_kern (c->plan, c->font, c->buffer);

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

@ -44,7 +44,6 @@ struct hb_ot_shape_plan_t
hb_mask_t kern_mask;
bool has_frac : 1;
bool kerning_requested : 1;
bool has_gpos_mark : 1;
bool fallback_glyph_classes : 1;
bool fallback_kerning : 1;