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[trak] Allow disabling tracking for ranges of text 

Fixes https://github.com/harfbuzz/harfbuzz/issues/1303
This commit is contained in:
Behdad Esfahbod 2018-10-23 03:10:56 -07:00
parent 8869436cb8
commit cf92d6579e
4 changed files with 16 additions and 5 deletions
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4
src/hb-aat-layout-trak-table.hh
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@ -184,6 +184,8 @@ struct trak
{
TRACE_APPLY (this);
hb_mask_t trak_mask = c->plan->trak_mask;
const float ptem = c->font->ptem;
if (unlikely (ptem <= 0.f))
return_trace (false);
@ -197,6 +199,7 @@ struct trak
hb_position_t advance_to_add = c->font->em_scalef_x (tracking);
foreach_grapheme (buffer, start, end)
{
if (!(buffer->info[start].mask & trak_mask)) continue;
buffer->pos[start].x_advance += advance_to_add;
buffer->pos[start].x_offset += offset_to_add;
}
@ -209,6 +212,7 @@ struct trak
hb_position_t advance_to_add = c->font->em_scalef_y (tracking);
foreach_grapheme (buffer, start, end)
{
if (!(buffer->info[start].mask & trak_mask)) continue;
buffer->pos[start].y_advance += advance_to_add;
buffer->pos[start].y_offset += offset_to_add;
}

11
src/hb-ot-shape.cc
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@ -62,16 +62,18 @@ hb_ot_shape_planner_t::compile (hb_ot_shape_plan_t &plan,
plan.shaper = shaper;
map.compile (plan.map, coords, num_coords);
plan.rtlm_mask = plan.map.get_1_mask (HB_TAG ('r','t','l','m'));
plan.frac_mask = plan.map.get_1_mask (HB_TAG ('f','r','a','c'));
plan.numr_mask = plan.map.get_1_mask (HB_TAG ('n','u','m','r'));
plan.dnom_mask = plan.map.get_1_mask (HB_TAG ('d','n','o','m'));
plan.has_frac = plan.frac_mask || (plan.numr_mask && plan.dnom_mask);
plan.rtlm_mask = plan.map.get_1_mask (HB_TAG ('r','t','l','m'));
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.trak_mask = plan.map.get_mask (HB_TAG ('t','r','a','k'));
plan.requested_kerning = !!plan.kern_mask;
plan.requested_tracking = !!plan.trak_mask;
bool has_gpos_kern = plan.map.get_feature_index (1, kern_tag) != HB_OT_LAYOUT_NO_FEATURE_INDEX;
bool disable_gpos = plan.shaper->gpos_tag &&
plan.shaper->gpos_tag != plan.map.chosen_script[1];
@ -116,8 +118,7 @@ hb_ot_shape_planner_t::compile (hb_ot_shape_plan_t &plan,
plan.fallback_mark_positioning = true;
/* Currently we always apply trak. */
plan.apply_trak = hb_aat_layout_has_tracking (face) &&
plan.map.needs_fallback (HB_TAG ('t','r','a','k'));
plan.apply_trak = plan.requested_tracking && hb_aat_layout_has_tracking (face);
}
@ -178,7 +179,9 @@ hb_ot_shape_collect_features (hb_ot_shape_planner_t *planner,
/* Random! */
map->enable_feature (HB_TAG ('r','a','n','d'), F_RANDOM, HB_OT_MAP_MAX_VALUE);
/* Tracking. */
/* Tracking. We enable dummy feature here just to allow disabling
* AAT 'trak' table using features.
* https://github.com/harfbuzz/harfbuzz/issues/1303 */
map->enable_feature (HB_TAG ('t','r','a','k'), F_HAS_FALLBACK);
map->enable_feature (HB_TAG ('H','A','R','F'));

5
src/hb-ot-shape.hh
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@ -40,10 +40,13 @@ struct hb_ot_shape_plan_t
const struct hb_ot_complex_shaper_t *shaper;
hb_ot_map_t map;
const void *data;
hb_mask_t rtlm_mask, frac_mask, numr_mask, dnom_mask;
hb_mask_t frac_mask, numr_mask, dnom_mask;
hb_mask_t rtlm_mask;
hb_mask_t kern_mask;
hb_mask_t trak_mask;
bool requested_kerning : 1;
bool requested_tracking : 1;
bool has_frac : 1;
bool has_gpos_mark : 1;
bool fallback_glyph_classes : 1;

1
test/shaping/data/in-house/tests/aat-trak.tests
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@ -8,3 +8,4 @@
../fonts/TestTRAK.ttf:--font-ptem=144:U+0041,U+0042,U+0043:[A.alt=0@-107,0+786|B=1@-107,0+786|C.alt=2@-107,0+786]
../fonts/TestTRAK.ttf:--font-ptem=144:U+0041,U+0042,U+0043:[A.alt=0@-107,0+786|B=1@-107,0+786|C.alt=2@-107,0+786]
../fonts/TestTRAK.ttf:--font-ptem=144 --features=-trak:U+0041,U+0042,U+0043:[A.alt=0+1000|B=1+1000|C.alt=2+1000]
../fonts/TestTRAK.ttf:--font-ptem=144 --features=-trak[1;3]:U+0041,U+0042,U+0043,U+0041,U+0042,U+0043:[A.alt=0@-107,0+786|B=1+1000|C.alt=2+1000|A.alt=3@-107,0+786|B=4@-107,0+786|C.alt=5@-107,0+786]