1 files changed, 161 insertions, 0 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/graph/coverage-graph.hh b/src/3rdparty/harfbuzz-ng/src/graph/coverage-graph.hh
new file mode 100644
index 0000000000..61ca063e34
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+++ b/src/3rdparty/harfbuzz-ng/src/graph/coverage-graph.hh
@@ -0,0 +1,161 @@
+/*
+ * Copyright © 2022  Google, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Garret Rieger
+ */
+
+#include "graph.hh"
+#include "../OT/Layout/Common/Coverage.hh"
+
+#ifndef GRAPH_COVERAGE_GRAPH_HH
+#define GRAPH_COVERAGE_GRAPH_HH
+
+namespace graph {
+
+struct CoverageFormat1 : public OT::Layout::Common::CoverageFormat1_3<SmallTypes>
+{
+  bool sanitize (graph_t::vertex_t& vertex) const
+  {
+    int64_t vertex_len = vertex.obj.tail - vertex.obj.head;
+    constexpr unsigned min_size = OT::Layout::Common::CoverageFormat1_3<SmallTypes>::min_size;
+    if (vertex_len < min_size) return false;
+    hb_barrier ();
+    return vertex_len >= min_size + glyphArray.get_size () - glyphArray.len.get_size ();
+  }
+};
+
+struct CoverageFormat2 : public OT::Layout::Common::CoverageFormat2_4<SmallTypes>
+{
+  bool sanitize (graph_t::vertex_t& vertex) const
+  {
+    int64_t vertex_len = vertex.obj.tail - vertex.obj.head;
+    constexpr unsigned min_size = OT::Layout::Common::CoverageFormat2_4<SmallTypes>::min_size;
+    if (vertex_len < min_size) return false;
+    hb_barrier ();
+    return vertex_len >= min_size + rangeRecord.get_size () - rangeRecord.len.get_size ();
+  }
+};
+
+struct Coverage : public OT::Layout::Common::Coverage
+{
+  static Coverage* clone_coverage (gsubgpos_graph_context_t& c,
+                                   unsigned coverage_id,
+                                   unsigned new_parent_id,
+                                   unsigned link_position,
+                                   unsigned start, unsigned end)
+
+  {
+    unsigned coverage_size = c.graph.vertices_[coverage_id].table_size ();
+    auto& coverage_v = c.graph.vertices_[coverage_id];
+    Coverage* coverage_table = (Coverage*) coverage_v.obj.head;
+    if (!coverage_table || !coverage_table->sanitize (coverage_v))
+      return nullptr;
+
+    auto new_coverage =
+        + hb_zip (coverage_table->iter (), hb_range ())
+        | hb_filter ([&] (hb_pair_t<unsigned, unsigned> p) {
+          return p.second >= start && p.second < end;
+        })
+        | hb_map_retains_sorting (hb_first)
+        ;
+
+    return add_coverage (c, new_parent_id, link_position, new_coverage, coverage_size);
+  }
+
+  template<typename It>
+  static Coverage* add_coverage (gsubgpos_graph_context_t& c,
+                                 unsigned parent_id,
+                                 unsigned link_position,
+                                 It glyphs,
+                                 unsigned max_size)
+  {
+    unsigned coverage_prime_id = c.graph.new_node (nullptr, nullptr);
+    auto& coverage_prime_vertex = c.graph.vertices_[coverage_prime_id];
+    if (!make_coverage (c, glyphs, coverage_prime_id, max_size))
+      return nullptr;
+
+    auto* coverage_link = c.graph.vertices_[parent_id].obj.real_links.push ();
+    coverage_link->width = SmallTypes::size;
+    coverage_link->objidx = coverage_prime_id;
+    coverage_link->position = link_position;
+    coverage_prime_vertex.add_parent (parent_id);
+
+    return (Coverage*) coverage_prime_vertex.obj.head;
+  }
+
+  template<typename It>
+  static bool make_coverage (gsubgpos_graph_context_t& c,
+                             It glyphs,
+                             unsigned dest_obj,
+                             unsigned max_size)
+  {
+    char* buffer = (char*) hb_calloc (1, max_size);
+    hb_serialize_context_t serializer (buffer, max_size);
+    OT::Layout::Common::Coverage_serialize (&serializer, glyphs);
+    serializer.end_serialize ();
+    if (serializer.in_error ())
+    {
+      hb_free (buffer);
+      return false;
+    }
+
+    hb_bytes_t coverage_copy = serializer.copy_bytes ();
+    if (!coverage_copy.arrayZ) return false;
+    // Give ownership to the context, it will cleanup the buffer.
+    if (!c.add_buffer ((char *) coverage_copy.arrayZ))
+    {
+      hb_free ((char *) coverage_copy.arrayZ);
+      return false;
+    }
+
+    auto& obj = c.graph.vertices_[dest_obj].obj;
+    obj.head = (char *) coverage_copy.arrayZ;
+    obj.tail = obj.head + coverage_copy.length;
+
+    hb_free (buffer);
+    return true;
+  }
+
+  bool sanitize (graph_t::vertex_t& vertex) const
+  {
+    int64_t vertex_len = vertex.obj.tail - vertex.obj.head;
+    if (vertex_len < OT::Layout::Common::Coverage::min_size) return false;
+    hb_barrier ();
+    switch (u.format)
+    {
+    case 1: return ((CoverageFormat1*)this)->sanitize (vertex);
+    case 2: return ((CoverageFormat2*)this)->sanitize (vertex);
+#ifndef HB_NO_BEYOND_64K
+    // Not currently supported
+    case 3:
+    case 4:
+#endif
+    default: return false;
+    }
+  }
+};
+
+
+}
+
+#endif  // GRAPH_COVERAGE_GRAPH_HH