1 files changed, 246 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-face-builder.cc b/gfx/harfbuzz/src/hb-face-builder.cc
new file mode 100644
index 0000000000..84b14d28d6
--- /dev/null
+++ b/gfx/harfbuzz/src/hb-face-builder.cc
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+/*
+ * Copyright © 2009  Red Hat, Inc.
+ * Copyright © 2012  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.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "hb.hh"
+
+#include "hb-face.hh"
+
+#include "hb-map.hh"
+#include "hb-open-file.hh"
+#include "hb-serialize.hh"
+
+
+/*
+ * face-builder: A face that has add_table().
+ */
+
+struct face_table_info_t
+{
+  hb_blob_t* data;
+  signed order;
+};
+
+struct hb_face_builder_data_t
+{
+  hb_hashmap_t<hb_tag_t, face_table_info_t> tables;
+};
+
+static int compare_entries (const void* pa, const void* pb)
+{
+  const auto& a = * (const hb_pair_t<hb_tag_t, face_table_info_t> *) pa;
+  const auto& b = * (const hb_pair_t<hb_tag_t, face_table_info_t> *) pb;
+
+  /* Order by blob size first (smallest to largest) and then table tag */
+
+  if (a.second.order != b.second.order)
+    return a.second.order < b.second.order ? -1 : +1;
+
+  if (a.second.data->length != b.second.data->length)
+    return a.second.data->length < b.second.data->length ? -1 : +1;
+
+  return a.first < b.first ? -1 : a.first == b.first ? 0 : +1;
+}
+
+static hb_face_builder_data_t *
+_hb_face_builder_data_create ()
+{
+  hb_face_builder_data_t *data = (hb_face_builder_data_t *) hb_calloc (1, sizeof (hb_face_builder_data_t));
+  if (unlikely (!data))
+    return nullptr;
+
+  data->tables.init ();
+
+  return data;
+}
+
+static void
+_hb_face_builder_data_destroy (void *user_data)
+{
+  hb_face_builder_data_t *data = (hb_face_builder_data_t *) user_data;
+
+  for (auto info : data->tables.values())
+    hb_blob_destroy (info.data);
+
+  data->tables.fini ();
+
+  hb_free (data);
+}
+
+static hb_blob_t *
+_hb_face_builder_data_reference_blob (hb_face_builder_data_t *data)
+{
+
+  unsigned int table_count = data->tables.get_population ();
+  unsigned int face_length = table_count * 16 + 12;
+
+  for (auto info : data->tables.values())
+    face_length += hb_ceil_to_4 (hb_blob_get_length (info.data));
+
+  char *buf = (char *) hb_malloc (face_length);
+  if (unlikely (!buf))
+    return nullptr;
+
+  hb_serialize_context_t c (buf, face_length);
+  c.propagate_error (data->tables);
+  OT::OpenTypeFontFile *f = c.start_serialize<OT::OpenTypeFontFile> ();
+
+  bool is_cff = (data->tables.has (HB_TAG ('C','F','F',' '))
+                 || data->tables.has (HB_TAG ('C','F','F','2')));
+  hb_tag_t sfnt_tag = is_cff ? OT::OpenTypeFontFile::CFFTag : OT::OpenTypeFontFile::TrueTypeTag;
+
+  // Sort the tags so that produced face is deterministic.
+  hb_vector_t<hb_pair_t <hb_tag_t, face_table_info_t>> sorted_entries;
+  data->tables.iter () | hb_sink (sorted_entries);
+  if (unlikely (sorted_entries.in_error ()))
+  {
+    hb_free (buf);
+    return nullptr;
+  }
+
+  sorted_entries.qsort (compare_entries);
+
+  bool ret = f->serialize_single (&c,
+                                  sfnt_tag,
+                                  + sorted_entries.iter()
+                                  | hb_map ([&] (hb_pair_t<hb_tag_t, face_table_info_t> _) {
+                                    return hb_pair_t<hb_tag_t, hb_blob_t*> (_.first, _.second.data);
+                                  }));
+
+  c.end_serialize ();
+
+  if (unlikely (!ret))
+  {
+    hb_free (buf);
+    return nullptr;
+  }
+
+  return hb_blob_create (buf, face_length, HB_MEMORY_MODE_WRITABLE, buf, hb_free);
+}
+
+static hb_blob_t *
+_hb_face_builder_reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
+{
+  hb_face_builder_data_t *data = (hb_face_builder_data_t *) user_data;
+
+  if (!tag)
+    return _hb_face_builder_data_reference_blob (data);
+
+  return hb_blob_reference (data->tables[tag].data);
+}
+
+
+/**
+ * hb_face_builder_create:
+ *
+ * Creates a #hb_face_t that can be used with hb_face_builder_add_table().
+ * After tables are added to the face, it can be compiled to a binary
+ * font file by calling hb_face_reference_blob().
+ *
+ * Return value: (transfer full): New face.
+ *
+ * Since: 1.9.0
+ **/
+hb_face_t *
+hb_face_builder_create ()
+{
+  hb_face_builder_data_t *data = _hb_face_builder_data_create ();
+  if (unlikely (!data)) return hb_face_get_empty ();
+
+  return hb_face_create_for_tables (_hb_face_builder_reference_table,
+				    data,
+				    _hb_face_builder_data_destroy);
+}
+
+/**
+ * hb_face_builder_add_table:
+ * @face: A face object created with hb_face_builder_create()
+ * @tag: The #hb_tag_t of the table to add
+ * @blob: The blob containing the table data to add
+ *
+ * Add table for @tag with data provided by @blob to the face.  @face must
+ * be created using hb_face_builder_create().
+ *
+ * Since: 1.9.0
+ **/
+hb_bool_t
+hb_face_builder_add_table (hb_face_t *face, hb_tag_t tag, hb_blob_t *blob)
+{
+  if (unlikely (face->destroy != (hb_destroy_func_t) _hb_face_builder_data_destroy))
+    return false;
+
+  if (tag == HB_MAP_VALUE_INVALID)
+    return false;
+
+  hb_face_builder_data_t *data = (hb_face_builder_data_t *) face->user_data;
+
+  hb_blob_t* previous = data->tables.get (tag).data;
+  if (!data->tables.set (tag, face_table_info_t {hb_blob_reference (blob), -1}))
+  {
+    hb_blob_destroy (blob);
+    return false;
+  }
+
+  hb_blob_destroy (previous);
+  return true;
+}
+
+/**
+ * hb_face_builder_sort_tables:
+ * @face: A face object created with hb_face_builder_create()
+ * @tags: (array zero-terminated=1): ordered list of table tags terminated by
+ *   %HB_TAG_NONE
+ *
+ * Set the ordering of tables for serialization. Any tables not
+ * specified in the tags list will be ordered after the tables in
+ * tags, ordered by the default sort ordering.
+ *
+ * Since: 5.3.0
+ **/
+void
+hb_face_builder_sort_tables (hb_face_t *face,
+                             const hb_tag_t  *tags)
+{
+  if (unlikely (face->destroy != (hb_destroy_func_t) _hb_face_builder_data_destroy))
+    return;
+
+  hb_face_builder_data_t *data = (hb_face_builder_data_t *) face->user_data;
+
+  // Sort all unspecified tables after any specified tables.
+  for (auto& info : data->tables.values_ref())
+    info.order = (unsigned) -1;
+
+  signed order = 0;
+  for (const hb_tag_t* tag = tags;
+       *tag;
+       tag++)
+  {
+    face_table_info_t* info;
+    if (!data->tables.has (*tag, &info)) continue;
+    info->order = order++;
+  }
+}