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-rw-r--r--gfx/harfbuzz/src/OT/Layout/GPOS/PairSet.hh207
1 files changed, 207 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/OT/Layout/GPOS/PairSet.hh b/gfx/harfbuzz/src/OT/Layout/GPOS/PairSet.hh
new file mode 100644
index 0000000000..9faff49909
--- /dev/null
+++ b/gfx/harfbuzz/src/OT/Layout/GPOS/PairSet.hh
@@ -0,0 +1,207 @@
+#ifndef OT_LAYOUT_GPOS_PAIRSET_HH
+#define OT_LAYOUT_GPOS_PAIRSET_HH
+
+#include "PairValueRecord.hh"
+
+namespace OT {
+namespace Layout {
+namespace GPOS_impl {
+
+
+template <typename Types>
+struct PairSet
+{
+ template <typename Types2>
+ friend struct PairPosFormat1_3;
+
+ using PairValueRecord = GPOS_impl::PairValueRecord<Types>;
+
+ protected:
+ HBUINT16 len; /* Number of PairValueRecords */
+ PairValueRecord firstPairValueRecord;
+ /* Array of PairValueRecords--ordered
+ * by GlyphID of the second glyph */
+ public:
+ DEFINE_SIZE_MIN (2);
+
+ static unsigned get_size (unsigned len1, unsigned len2)
+ {
+ return Types::HBGlyphID::static_size + Value::static_size * (len1 + len2);
+ }
+ static unsigned get_size (const ValueFormat valueFormats[2])
+ {
+ unsigned len1 = valueFormats[0].get_len ();
+ unsigned len2 = valueFormats[1].get_len ();
+ return get_size (len1, len2);
+ }
+
+ struct sanitize_closure_t
+ {
+ const ValueFormat *valueFormats;
+ unsigned int len1; /* valueFormats[0].get_len() */
+ unsigned int stride; /* bytes */
+ };
+
+ bool sanitize (hb_sanitize_context_t *c, const sanitize_closure_t *closure) const
+ {
+ TRACE_SANITIZE (this);
+ if (!(c->check_struct (this)
+ && c->check_range (&firstPairValueRecord,
+ len,
+ closure->stride))) return_trace (false);
+
+ unsigned int count = len;
+ const PairValueRecord *record = &firstPairValueRecord;
+ return_trace (closure->valueFormats[0].sanitize_values_stride_unsafe (c, this, &record->values[0], count, closure->stride) &&
+ closure->valueFormats[1].sanitize_values_stride_unsafe (c, this, &record->values[closure->len1], count, closure->stride));
+ }
+
+ bool intersects (const hb_set_t *glyphs,
+ const ValueFormat *valueFormats) const
+ {
+ unsigned record_size = get_size (valueFormats);
+
+ const PairValueRecord *record = &firstPairValueRecord;
+ unsigned int count = len;
+ for (unsigned int i = 0; i < count; i++)
+ {
+ if (glyphs->has (record->secondGlyph))
+ return true;
+ record = &StructAtOffset<const PairValueRecord> (record, record_size);
+ }
+ return false;
+ }
+
+ void collect_glyphs (hb_collect_glyphs_context_t *c,
+ const ValueFormat *valueFormats) const
+ {
+ unsigned record_size = get_size (valueFormats);
+
+ const PairValueRecord *record = &firstPairValueRecord;
+ c->input->add_array (&record->secondGlyph, len, record_size);
+ }
+
+ void collect_variation_indices (hb_collect_variation_indices_context_t *c,
+ const ValueFormat *valueFormats) const
+ {
+ unsigned record_size = get_size (valueFormats);
+
+ const PairValueRecord *record = &firstPairValueRecord;
+ unsigned count = len;
+ for (unsigned i = 0; i < count; i++)
+ {
+ if (c->glyph_set->has (record->secondGlyph))
+ { record->collect_variation_indices (c, valueFormats, this); }
+
+ record = &StructAtOffset<const PairValueRecord> (record, record_size);
+ }
+ }
+
+ bool apply (hb_ot_apply_context_t *c,
+ const ValueFormat *valueFormats,
+ unsigned int pos) const
+ {
+ TRACE_APPLY (this);
+ hb_buffer_t *buffer = c->buffer;
+ unsigned int len1 = valueFormats[0].get_len ();
+ unsigned int len2 = valueFormats[1].get_len ();
+ unsigned record_size = get_size (len1, len2);
+
+ const PairValueRecord *record = hb_bsearch (buffer->info[pos].codepoint,
+ &firstPairValueRecord,
+ len,
+ record_size);
+ if (record)
+ {
+ if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+ {
+ c->buffer->message (c->font,
+ "try kerning glyphs at %u,%u",
+ c->buffer->idx, pos);
+ }
+
+ bool applied_first = len1 && valueFormats[0].apply_value (c, this, &record->values[0], buffer->cur_pos());
+ bool applied_second = len2 && valueFormats[1].apply_value (c, this, &record->values[len1], buffer->pos[pos]);
+
+ if (applied_first || applied_second)
+ if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+ {
+ c->buffer->message (c->font,
+ "kerned glyphs at %u,%u",
+ c->buffer->idx, pos);
+ }
+
+ if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+ {
+ c->buffer->message (c->font,
+ "tried kerning glyphs at %u,%u",
+ c->buffer->idx, pos);
+ }
+
+ if (applied_first || applied_second)
+ buffer->unsafe_to_break (buffer->idx, pos + 1);
+
+ if (len2)
+ {
+ pos++;
+ // https://github.com/harfbuzz/harfbuzz/issues/3824
+ // https://github.com/harfbuzz/harfbuzz/issues/3888#issuecomment-1326781116
+ buffer->unsafe_to_break (buffer->idx, pos + 1);
+ }
+
+ buffer->idx = pos;
+ return_trace (true);
+ }
+ buffer->unsafe_to_concat (buffer->idx, pos + 1);
+ return_trace (false);
+ }
+
+ bool subset (hb_subset_context_t *c,
+ const ValueFormat valueFormats[2],
+ const ValueFormat newFormats[2]) const
+ {
+ TRACE_SUBSET (this);
+ auto snap = c->serializer->snapshot ();
+
+ auto *out = c->serializer->start_embed (*this);
+ if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
+ out->len = 0;
+
+ const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
+ const hb_map_t &glyph_map = *c->plan->glyph_map;
+
+ unsigned len1 = valueFormats[0].get_len ();
+ unsigned len2 = valueFormats[1].get_len ();
+ unsigned record_size = get_size (len1, len2);
+
+ typename PairValueRecord::context_t context =
+ {
+ this,
+ valueFormats,
+ newFormats,
+ len1,
+ &glyph_map,
+ &c->plan->layout_variation_idx_delta_map
+ };
+
+ const PairValueRecord *record = &firstPairValueRecord;
+ unsigned count = len, num = 0;
+ for (unsigned i = 0; i < count; i++)
+ {
+ if (glyphset.has (record->secondGlyph)
+ && record->subset (c, &context)) num++;
+ record = &StructAtOffset<const PairValueRecord> (record, record_size);
+ }
+
+ out->len = num;
+ if (!num) c->serializer->revert (snap);
+ return_trace (num);
+ }
+};
+
+
+}
+}
+}
+
+#endif // OT_LAYOUT_GPOS_PAIRSET_HH