Update to Harfbuzz 2.6.4

Quite a big change since it has been several years since
the last update. This drops the Harfbuzz source on top
of the existing code in Qt, and does the following
additional changes:

1. Deletes old source files that have been removed upstream
(everything named foo-private.hh is now renamed to just
foo.hh for instance).

2. Added a header guard to config.h because it may be
double-included.

3. Implement a memory barrier needed by hb-atomic.hh.

4. Changed the signature of hb_atomic_int_impl_add()
to take a pointer to match new upstream.

5. Updated .pro file to include new files and removed
old.

6. Updated qt_attribution.json

7. No longer disable deprecated APIs since
hb_ot_tags_from_script() is now deprecated and is used
from Qt code.

8. Updated and applied the patch in patches/ for CoreText.

9. Updated tst_qtextscriptengine::thaiWithZWJ() according to
changes in Harfbuzz and disabled it for system-harfbuzz,
since this may be an older version of harfbuzz depending on
the system.

Fixes: QTBUG-79606
Change-Id: I3f057a43ff44ee416628b75ef12fb1a221f31910
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 109 insertions, 0 deletions

diff --git a/src/3rdparty/harfbuzz-ng/src/hb-face.hh b/src/3rdparty/harfbuzz-ng/src/hb-face.hh
new file mode 100644
index 0000000000..68834baeb8
--- /dev/null
+++ b/src/3rdparty/harfbuzz-ng/src/hb-face.hh
@@ -0,0 +1,109 @@
+/*
+ * Copyright © 2009  Red Hat, Inc.
+ * Copyright © 2011  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
+ */
+
+#ifndef HB_FACE_HH
+#define HB_FACE_HH
+
+#include "hb.hh"
+
+#include "hb-shaper.hh"
+#include "hb-shape-plan.hh"
+#include "hb-ot-face.hh"
+
+
+/*
+ * hb_face_t
+ */
+
+#define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_INSTANTIATE_SHAPERS(shaper, face);
+#include "hb-shaper-list.hh"
+#undef HB_SHAPER_IMPLEMENT
+
+struct hb_face_t
+{
+  hb_object_header_t header;
+
+  hb_reference_table_func_t  reference_table_func;
+  void                      *user_data;
+  hb_destroy_func_t          destroy;
+
+  unsigned int index;			/* Face index in a collection, zero-based. */
+  mutable hb_atomic_int_t upem;		/* Units-per-EM. */
+  mutable hb_atomic_int_t num_glyphs;	/* Number of glyphs. */
+
+  hb_shaper_object_dataset_t<hb_face_t> data;/* Various shaper data. */
+  hb_ot_face_t table;			/* All the face's tables. */
+
+  /* Cache */
+  struct plan_node_t
+  {
+    hb_shape_plan_t *shape_plan;
+    plan_node_t *next;
+  };
+  hb_atomic_ptr_t<plan_node_t> shape_plans;
+
+  hb_blob_t *reference_table (hb_tag_t tag) const
+  {
+    hb_blob_t *blob;
+
+    if (unlikely (!reference_table_func))
+      return hb_blob_get_empty ();
+
+    blob = reference_table_func (/*XXX*/const_cast<hb_face_t *> (this), tag, user_data);
+    if (unlikely (!blob))
+      return hb_blob_get_empty ();
+
+    return blob;
+  }
+
+  HB_PURE_FUNC unsigned int get_upem () const
+  {
+    unsigned int ret = upem.get_relaxed ();
+    if (unlikely (!ret))
+    {
+      return load_upem ();
+    }
+    return ret;
+  }
+
+  unsigned int get_num_glyphs () const
+  {
+    unsigned int ret = num_glyphs.get_relaxed ();
+    if (unlikely (ret == (unsigned int) -1))
+      return load_num_glyphs ();
+    return ret;
+  }
+
+  private:
+  HB_INTERNAL unsigned int load_upem () const;
+  HB_INTERNAL unsigned int load_num_glyphs () const;
+};
+DECLARE_NULL_INSTANCE (hb_face_t);
+
+
+#endif /* HB_FACE_HH */