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, 126 insertions, 0 deletions

diff --git a/src/3rdparty/harfbuzz-ng/src/hb-aat-fdsc-table.hh b/src/3rdparty/harfbuzz-ng/src/hb-aat-fdsc-table.hh
new file mode 100644
index 0000000000..604d5bcf05
--- /dev/null
+++ b/src/3rdparty/harfbuzz-ng/src/hb-aat-fdsc-table.hh
@@ -0,0 +1,126 @@
+/*
+ * Copyright © 2018  Ebrahim Byagowi
+ *
+ *  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.
+ */
+
+#ifndef HB_AAT_FDSC_TABLE_HH
+#define HB_AAT_FDSC_TABLE_HH
+
+#include "hb-aat-layout-common.hh"
+#include "hb-open-type.hh"
+
+/*
+ * fdsc -- Font descriptors
+ * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6fdsc.html
+ */
+#define HB_AAT_TAG_fdsc HB_TAG('f','d','s','c')
+
+
+namespace AAT {
+
+
+struct FontDescriptor
+{
+  bool has_data () const { return tag; }
+
+  int cmp (hb_tag_t a) const { return tag.cmp (a); }
+
+  float get_value () const { return u.value.to_float (); }
+
+  enum non_alphabetic_value_t {
+    Alphabetic		= 0,
+    Dingbats		= 1,
+    PiCharacters	= 2,
+    Fleurons		= 3,
+    DecorativeBorders	= 4,
+    InternationalSymbols= 5,
+    MathSymbols		= 6
+  };
+
+  bool sanitize (hb_sanitize_context_t *c) const
+  {
+    TRACE_SANITIZE (this);
+    return_trace (c->check_struct (this));
+  }
+
+  protected:
+  Tag		tag;		/* The 4-byte table tag name. */
+  union {
+  HBFixed		value;		/* The value for the descriptor tag. */
+  HBUINT32	nalfType;	/* If the tag is `nalf`, see non_alphabetic_value_t */
+  } u;
+  public:
+  DEFINE_SIZE_STATIC (8);
+};
+
+struct fdsc
+{
+  static constexpr hb_tag_t tableTag = HB_AAT_TAG_fdsc;
+
+  enum {
+    Weight	 = HB_TAG ('w','g','h','t'),
+				/* Percent weight relative to regular weight.
+				 * (defaul value: 1.0) */
+    Width 	 = HB_TAG ('w','d','t','h'),
+				/* Percent width relative to regular width.
+				 * (default value: 1.0) */
+    Slant 	 = HB_TAG ('s','l','n','t'),
+				/* Angle of slant in degrees, where positive
+				 * is clockwise from straight up.
+				 * (default value: 0.0) */
+    OpticalSize  = HB_TAG ('o','p','s','z'),
+				/* Point size the font was designed for.
+				 * (default value: 12.0) */
+    NonAlphabetic= HB_TAG ('n','a','l','f')
+				/* These values are treated as integers,
+				 * not fixed32s. 0 means alphabetic, and greater
+				 * integers mean the font is non-alphabetic (e.g. symbols).
+				 * (default value: 0) */
+  };
+
+  const FontDescriptor &get_descriptor (hb_tag_t style) const
+  { return descriptors.lsearch (style); }
+
+  bool sanitize (hb_sanitize_context_t *c) const
+  {
+    TRACE_SANITIZE (this);
+    return_trace (c->check_struct (this) &&
+		  descriptors.sanitize (c));
+  }
+
+  protected:
+  HBFixed		version;	/* Version number of the font descriptors
+				 * table (0x00010000 for the current version). */
+  LArrayOf<FontDescriptor>
+		descriptors;	/* List of tagged-coordinate pairs style descriptors
+				 * that will be included to characterize this font.
+				 * Each descriptor consists of a <tag, value> pair.
+				 * These pairs are located in the gxFontDescriptor
+				 * array that follows. */
+  public:
+  DEFINE_SIZE_ARRAY (8, descriptors);
+};
+
+} /* namespace AAT */
+
+
+#endif /* HB_AAT_FDSC_TABLE_HH */