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-rw-r--r--src/3rdparty/harfbuzz-ng/src/OT/Layout/GSUB/LigatureSet.hh188
1 files changed, 188 insertions, 0 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/OT/Layout/GSUB/LigatureSet.hh b/src/3rdparty/harfbuzz-ng/src/OT/Layout/GSUB/LigatureSet.hh
new file mode 100644
index 0000000000..08665438c4
--- /dev/null
+++ b/src/3rdparty/harfbuzz-ng/src/OT/Layout/GSUB/LigatureSet.hh
@@ -0,0 +1,188 @@
+#ifndef OT_LAYOUT_GSUB_LIGATURESET_HH
+#define OT_LAYOUT_GSUB_LIGATURESET_HH
+
+#include "Common.hh"
+#include "Ligature.hh"
+
+namespace OT {
+namespace Layout {
+namespace GSUB_impl {
+
+template <typename Types>
+struct LigatureSet
+{
+ protected:
+ Array16OfOffset16To<Ligature<Types>>
+ ligature; /* Array LigatureSet tables
+ * ordered by preference */
+ public:
+ DEFINE_SIZE_ARRAY (2, ligature);
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (ligature.sanitize (c, this));
+ }
+
+ bool intersects (const hb_set_t *glyphs) const
+ {
+ return
+ + hb_iter (ligature)
+ | hb_map (hb_add (this))
+ | hb_map ([glyphs] (const Ligature<Types> &_) { return _.intersects (glyphs); })
+ | hb_any
+ ;
+ }
+
+ bool intersects_lig_glyph (const hb_set_t *glyphs) const
+ {
+ return
+ + hb_iter (ligature)
+ | hb_map (hb_add (this))
+ | hb_map ([glyphs] (const Ligature<Types> &_) {
+ return _.intersects_lig_glyph (glyphs) && _.intersects (glyphs);
+ })
+ | hb_any
+ ;
+ }
+
+ void closure (hb_closure_context_t *c) const
+ {
+ + hb_iter (ligature)
+ | hb_map (hb_add (this))
+ | hb_apply ([c] (const Ligature<Types> &_) { _.closure (c); })
+ ;
+ }
+
+ void collect_glyphs (hb_collect_glyphs_context_t *c) const
+ {
+ + hb_iter (ligature)
+ | hb_map (hb_add (this))
+ | hb_apply ([c] (const Ligature<Types> &_) { _.collect_glyphs (c); })
+ ;
+ }
+
+ bool would_apply (hb_would_apply_context_t *c) const
+ {
+ return
+ + hb_iter (ligature)
+ | hb_map (hb_add (this))
+ | hb_map ([c] (const Ligature<Types> &_) { return _.would_apply (c); })
+ | hb_any
+ ;
+ }
+
+ bool apply (hb_ot_apply_context_t *c) const
+ {
+ TRACE_APPLY (this);
+
+ unsigned int num_ligs = ligature.len;
+
+#ifndef HB_NO_OT_RULESETS_FAST_PATH
+ if (HB_OPTIMIZE_SIZE_VAL || num_ligs <= 4)
+#endif
+ {
+ slow:
+ for (unsigned int i = 0; i < num_ligs; i++)
+ {
+ const auto &lig = this+ligature.arrayZ[i];
+ if (lig.apply (c)) return_trace (true);
+ }
+ return_trace (false);
+ }
+
+ /* This version is optimized for speed by matching the first component
+ * of the ligature here, instead of calling into the ligation code.
+ *
+ * This is replicated in ChainRuleSet and RuleSet. */
+
+ hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
+ skippy_iter.reset (c->buffer->idx);
+ skippy_iter.set_match_func (match_always, nullptr);
+ skippy_iter.set_glyph_data ((HBUINT16 *) nullptr);
+ unsigned unsafe_to;
+ hb_codepoint_t first = (unsigned) -1;
+ bool matched = skippy_iter.next (&unsafe_to);
+ if (likely (matched))
+ {
+ first = c->buffer->info[skippy_iter.idx].codepoint;
+ unsafe_to = skippy_iter.idx + 1;
+
+ if (skippy_iter.may_skip (c->buffer->info[skippy_iter.idx]))
+ {
+ /* Can't use the fast path if eg. the next char is a default-ignorable
+ * or other skippable. */
+ goto slow;
+ }
+ }
+ else
+ goto slow;
+
+ bool unsafe_to_concat = false;
+
+ for (unsigned int i = 0; i < num_ligs; i++)
+ {
+ const auto &lig = this+ligature.arrayZ[i];
+ if (unlikely (lig.component.lenP1 <= 1) ||
+ lig.component.arrayZ[0] == first)
+ {
+ if (lig.apply (c))
+ {
+ if (unsafe_to_concat)
+ c->buffer->unsafe_to_concat (c->buffer->idx, unsafe_to);
+ return_trace (true);
+ }
+ }
+ else if (likely (lig.component.lenP1 > 1))
+ unsafe_to_concat = true;
+ }
+ if (likely (unsafe_to_concat))
+ c->buffer->unsafe_to_concat (c->buffer->idx, unsafe_to);
+
+ return_trace (false);
+ }
+
+ bool serialize (hb_serialize_context_t *c,
+ hb_array_t<const HBGlyphID16> ligatures,
+ hb_array_t<const unsigned int> component_count_list,
+ hb_array_t<const HBGlyphID16> &component_list /* Starting from second for each ligature */)
+ {
+ TRACE_SERIALIZE (this);
+ if (unlikely (!c->extend_min (this))) return_trace (false);
+ if (unlikely (!ligature.serialize (c, ligatures.length))) return_trace (false);
+ for (unsigned int i = 0; i < ligatures.length; i++)
+ {
+ unsigned int component_count = (unsigned) hb_max ((int) component_count_list[i] - 1, 0);
+ if (unlikely (!ligature[i].serialize_serialize (c,
+ ligatures[i],
+ component_list.sub_array (0, component_count))))
+ return_trace (false);
+ component_list += component_count;
+ }
+ return_trace (true);
+ }
+
+ bool subset (hb_subset_context_t *c, unsigned coverage_idx) const
+ {
+ TRACE_SUBSET (this);
+ auto *out = c->serializer->start_embed (*this);
+ if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
+
+ + hb_iter (ligature)
+ | hb_filter (subset_offset_array (c, out->ligature, this, coverage_idx))
+ | hb_drain
+ ;
+
+ if (bool (out->ligature))
+ // Ensure Coverage table is always packed after this.
+ c->serializer->add_virtual_link (coverage_idx);
+
+ return_trace (bool (out->ligature));
+ }
+};
+
+}
+}
+}
+
+#endif /* OT_LAYOUT_GSUB_LIGATURESET_HH */