diff options
Diffstat (limited to 'thirdparty/harfbuzz/src/hb-subset.cc')
| -rw-r--r-- | thirdparty/harfbuzz/src/hb-subset.cc | 117 |
1 files changed, 87 insertions, 30 deletions
diff --git a/thirdparty/harfbuzz/src/hb-subset.cc b/thirdparty/harfbuzz/src/hb-subset.cc index 1a0bcbd1fe..186b12dbb8 100644 --- a/thirdparty/harfbuzz/src/hb-subset.cc +++ b/thirdparty/harfbuzz/src/hb-subset.cc @@ -50,11 +50,13 @@ #include "hb-ot-color-cbdt-table.hh" #include "hb-ot-layout-gsub-table.hh" #include "hb-ot-layout-gpos-table.hh" +#include "hb-ot-var-fvar-table.hh" #include "hb-ot-var-gvar-table.hh" #include "hb-ot-var-hvar-table.hh" #include "hb-ot-math-table.hh" #include "hb-ot-stat-table.hh" #include "hb-repacker.hh" +#include "hb-subset-accelerator.hh" using OT::Layout::GSUB; using OT::Layout::GPOS; @@ -80,6 +82,10 @@ using OT::Layout::GPOS; * retain glyph ids option and configure the subset to pass through the layout tables untouched. */ + +hb_user_data_key_t _hb_subset_accelerator_user_data_key = {}; + + /* * The list of tables in the open type spec. Used to check for tables that may need handling * if we are unable to list the tables in a face. @@ -407,20 +413,14 @@ _passthrough (hb_subset_plan_t *plan, hb_tag_t tag) static bool _dependencies_satisfied (hb_subset_plan_t *plan, hb_tag_t tag, - hb_set_t &visited_set, hb_set_t &revisit_set) + const hb_set_t &subsetted_tags, + const hb_set_t &pending_subset_tags) { switch (tag) { case HB_OT_TAG_hmtx: case HB_OT_TAG_vmtx: - if (!plan->pinned_at_default && - !visited_set.has (HB_OT_TAG_glyf)) - { - revisit_set.add (tag); - return false; - } - return true; - + return plan->pinned_at_default || !pending_subset_tags.has (HB_OT_TAG_glyf); default: return true; } @@ -475,6 +475,9 @@ _subset_table (hb_subset_plan_t *plan, case HB_OT_TAG_HVAR: return _subset<const OT::HVAR> (plan, buf); case HB_OT_TAG_VVAR: return _subset<const OT::VVAR> (plan, buf); #endif + case HB_OT_TAG_fvar: + if (plan->user_axes_location->is_empty ()) return _passthrough (plan, tag); + return _subset<const OT::fvar> (plan, buf); case HB_OT_TAG_STAT: /*TODO(qxliu): change the condition as we support more complex * instancing operation*/ @@ -490,6 +493,34 @@ _subset_table (hb_subset_plan_t *plan, } } +static void _attach_accelerator_data (hb_subset_plan_t* plan, + hb_face_t* face /* IN/OUT */) +{ + if (!plan->inprogress_accelerator) return; + + // Transfer the accelerator from the plan to us. + hb_subset_accelerator_t* accel = plan->inprogress_accelerator; + plan->inprogress_accelerator = nullptr; + + if (accel->in_error ()) + { + hb_subset_accelerator_t::destroy (accel); + return; + } + + // Populate caches that need access to the final tables. + hb_blob_ptr_t<OT::cmap> cmap_ptr (hb_sanitize_context_t ().reference_table<OT::cmap> (face)); + accel->cmap_cache = OT::cmap::create_filled_cache (cmap_ptr); + accel->destroy_cmap_cache = OT::SubtableUnicodesCache::destroy; + + if (!hb_face_set_user_data(face, + hb_subset_accelerator_t::user_data_key(), + accel, + hb_subset_accelerator_t::destroy, + true)) + hb_subset_accelerator_t::destroy (accel); +} + /** * hb_subset_or_fail: * @source: font face data to be subset. @@ -535,41 +566,67 @@ hb_subset_plan_execute_or_fail (hb_subset_plan_t *plan) return nullptr; } - hb_set_t tags_set, revisit_set; - bool success = true; hb_tag_t table_tags[32]; unsigned offset = 0, num_tables = ARRAY_LENGTH (table_tags); - hb_vector_t<char> buf; - buf.alloc (4096 - 16); + hb_set_t subsetted_tags, pending_subset_tags; while (((void) _get_table_tags (plan, offset, &num_tables, table_tags), num_tables)) { for (unsigned i = 0; i < num_tables; ++i) { hb_tag_t tag = table_tags[i]; - if (_should_drop_table (plan, tag) && !tags_set.has (tag)) continue; - if (!_dependencies_satisfied (plan, tag, tags_set, revisit_set)) continue; - tags_set.add (tag); - success = _subset_table (plan, buf, tag); - if (unlikely (!success)) goto end; + if (_should_drop_table (plan, tag)) continue; + pending_subset_tags.add (tag); + } + + offset += num_tables; + } + + hb_vector_t<char> buf; + buf.alloc (4096 - 16); + + + bool success = true; + + while (!pending_subset_tags.is_empty ()) + { + if (subsetted_tags.in_error () + || pending_subset_tags.in_error ()) { + success = false; + goto end; } - /*delayed subsetting for some tables since they might have dependency on other tables in some cases: - e.g: during instantiating glyf tables, hmetrics/vmetrics are updated and saved in subset plan, - hmtx/vmtx subsetting need to use these updated metrics values*/ - while (!revisit_set.is_empty ()) + bool made_changes = false; + for (hb_tag_t tag : pending_subset_tags) { - hb_set_t revisit_temp; - for (hb_tag_t tag : revisit_set) + if (!_dependencies_satisfied (plan, tag, + subsetted_tags, + pending_subset_tags)) { - if (!_dependencies_satisfied (plan, tag, tags_set, revisit_temp)) continue; - tags_set.add (tag); - success = _subset_table (plan, buf, tag); - if (unlikely (!success)) goto end; + // delayed subsetting for some tables since they might have dependency on other tables + // in some cases: e.g: during instantiating glyf tables, hmetrics/vmetrics are updated + // and saved in subset plan, hmtx/vmtx subsetting need to use these updated metrics values + continue; } - revisit_set = revisit_temp; + + pending_subset_tags.del (tag); + subsetted_tags.add (tag); + made_changes = true; + + success = _subset_table (plan, buf, tag); + if (unlikely (!success)) goto end; } - offset += num_tables; + + if (!made_changes) + { + DEBUG_MSG (SUBSET, nullptr, "Table dependencies unable to be satisfied. Subset failed."); + success = false; + goto end; + } + } + + if (success && plan->attach_accelerator_data) { + _attach_accelerator_data (plan, plan->dest); } end: |