Merge pull request #41100 from bruvzg/ctl_text_server_interface

[Complex Text Layouts] Implement TextServer interface.

1 files changed, 307 insertions, 0 deletions

diff --git a/thirdparty/harfbuzz/src/hb-machinery.hh b/thirdparty/harfbuzz/src/hb-machinery.hh
new file mode 100644
index 0000000000..54bc60d4c8
--- /dev/null
+++ b/thirdparty/harfbuzz/src/hb-machinery.hh
@@ -0,0 +1,307 @@
+/*
+ * Copyright © 2007,2008,2009,2010  Red Hat, Inc.
+ * Copyright © 2012,2018  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_MACHINERY_HH
+#define HB_MACHINERY_HH
+
+#include "hb.hh"
+#include "hb-blob.hh"
+
+#include "hb-dispatch.hh"
+#include "hb-sanitize.hh"
+#include "hb-serialize.hh"
+
+
+/*
+ * Casts
+ */
+
+/* StructAtOffset<T>(P,Ofs) returns the struct T& that is placed at memory
+ * location pointed to by P plus Ofs bytes. */
+template<typename Type>
+static inline const Type& StructAtOffset(const void *P, unsigned int offset)
+{ return * reinterpret_cast<const Type*> ((const char *) P + offset); }
+template<typename Type>
+static inline Type& StructAtOffset(void *P, unsigned int offset)
+{ return * reinterpret_cast<Type*> ((char *) P + offset); }
+template<typename Type>
+static inline const Type& StructAtOffsetUnaligned(const void *P, unsigned int offset)
+{
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-align"
+  return * reinterpret_cast<const Type*> ((const char *) P + offset);
+#pragma GCC diagnostic pop
+}
+template<typename Type>
+static inline Type& StructAtOffsetUnaligned(void *P, unsigned int offset)
+{
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-align"
+  return * reinterpret_cast<Type*> ((char *) P + offset);
+#pragma GCC diagnostic pop
+}
+
+/* StructAfter<T>(X) returns the struct T& that is placed after X.
+ * Works with X of variable size also.  X must implement get_size() */
+template<typename Type, typename TObject>
+static inline const Type& StructAfter(const TObject &X)
+{ return StructAtOffset<Type>(&X, X.get_size()); }
+template<typename Type, typename TObject>
+static inline Type& StructAfter(TObject &X)
+{ return StructAtOffset<Type>(&X, X.get_size()); }
+
+
+/*
+ * Size checking
+ */
+
+/* Check _assertion in a method environment */
+#define _DEFINE_INSTANCE_ASSERTION1(_line, _assertion) \
+  void _instance_assertion_on_line_##_line () const \
+  { static_assert ((_assertion), ""); }
+# define _DEFINE_INSTANCE_ASSERTION0(_line, _assertion) _DEFINE_INSTANCE_ASSERTION1 (_line, _assertion)
+# define DEFINE_INSTANCE_ASSERTION(_assertion) _DEFINE_INSTANCE_ASSERTION0 (__LINE__, _assertion)
+
+/* Check that _code compiles in a method environment */
+#define _DEFINE_COMPILES_ASSERTION1(_line, _code) \
+  void _compiles_assertion_on_line_##_line () const \
+  { _code; }
+# define _DEFINE_COMPILES_ASSERTION0(_line, _code) _DEFINE_COMPILES_ASSERTION1 (_line, _code)
+# define DEFINE_COMPILES_ASSERTION(_code) _DEFINE_COMPILES_ASSERTION0 (__LINE__, _code)
+
+
+#define DEFINE_SIZE_STATIC(size) \
+  DEFINE_INSTANCE_ASSERTION (sizeof (*this) == (size)) \
+  unsigned int get_size () const { return (size); } \
+  static constexpr unsigned null_size = (size); \
+  static constexpr unsigned min_size = (size); \
+  static constexpr unsigned static_size = (size)
+
+#define DEFINE_SIZE_UNION(size, _member) \
+  DEFINE_COMPILES_ASSERTION ((void) this->u._member.static_size) \
+  DEFINE_INSTANCE_ASSERTION (sizeof(this->u._member) == (size)) \
+  static constexpr unsigned null_size = (size); \
+  static constexpr unsigned min_size = (size)
+
+#define DEFINE_SIZE_MIN(size) \
+  DEFINE_INSTANCE_ASSERTION (sizeof (*this) >= (size)) \
+  static constexpr unsigned null_size = (size); \
+  static constexpr unsigned min_size = (size)
+
+#define DEFINE_SIZE_UNBOUNDED(size) \
+  DEFINE_INSTANCE_ASSERTION (sizeof (*this) >= (size)) \
+  static constexpr unsigned min_size = (size)
+
+#define DEFINE_SIZE_ARRAY(size, array) \
+  DEFINE_COMPILES_ASSERTION ((void) (array)[0].static_size) \
+  DEFINE_INSTANCE_ASSERTION (sizeof (*this) == (size) + (HB_VAR_ARRAY+0) * sizeof ((array)[0])) \
+  static constexpr unsigned null_size = (size); \
+  static constexpr unsigned min_size = (size)
+
+#define DEFINE_SIZE_ARRAY_SIZED(size, array) \
+  unsigned int get_size () const { return (size - (array).min_size + (array).get_size ()); } \
+  DEFINE_SIZE_ARRAY(size, array)
+
+
+
+/*
+ * Lazy loaders.
+ */
+
+template <typename Data, unsigned int WheresData>
+struct hb_data_wrapper_t
+{
+  static_assert (WheresData > 0, "");
+
+  Data * get_data () const
+  { return *(((Data **) (void *) this) - WheresData); }
+
+  bool is_inert () const { return !get_data (); }
+
+  template <typename Stored, typename Subclass>
+  Stored * call_create () const { return Subclass::create (get_data ()); }
+};
+template <>
+struct hb_data_wrapper_t<void, 0>
+{
+  bool is_inert () const { return false; }
+
+  template <typename Stored, typename Funcs>
+  Stored * call_create () const { return Funcs::create (); }
+};
+
+template <typename T1, typename T2> struct hb_non_void_t { typedef T1 value; };
+template <typename T2> struct hb_non_void_t<void, T2> { typedef T2 value; };
+
+template <typename Returned,
+	  typename Subclass = void,
+	  typename Data = void,
+	  unsigned int WheresData = 0,
+	  typename Stored = Returned>
+struct hb_lazy_loader_t : hb_data_wrapper_t<Data, WheresData>
+{
+  typedef typename hb_non_void_t<Subclass,
+				 hb_lazy_loader_t<Returned,Subclass,Data,WheresData,Stored>
+				>::value Funcs;
+
+  void init0 () {} /* Init, when memory is already set to 0. No-op for us. */
+  void init ()  { instance.set_relaxed (nullptr); }
+  void fini ()  { do_destroy (instance.get ()); }
+
+  void free_instance ()
+  {
+  retry:
+    Stored *p = instance.get ();
+    if (unlikely (p && !cmpexch (p, nullptr)))
+      goto retry;
+    do_destroy (p);
+  }
+
+  static void do_destroy (Stored *p)
+  {
+    if (p && p != const_cast<Stored *> (Funcs::get_null ()))
+      Funcs::destroy (p);
+  }
+
+  const Returned * operator -> () const { return get (); }
+  const Returned & operator * () const  { return *get (); }
+  explicit operator bool () const
+  { return get_stored () != Funcs::get_null (); }
+  template <typename C> operator const C * () const { return get (); }
+
+  Stored * get_stored () const
+  {
+  retry:
+    Stored *p = this->instance.get ();
+    if (unlikely (!p))
+    {
+      if (unlikely (this->is_inert ()))
+	return const_cast<Stored *> (Funcs::get_null ());
+
+      p = this->template call_create<Stored, Funcs> ();
+      if (unlikely (!p))
+	p = const_cast<Stored *> (Funcs::get_null ());
+
+      if (unlikely (!cmpexch (nullptr, p)))
+      {
+	do_destroy (p);
+	goto retry;
+      }
+    }
+    return p;
+  }
+  Stored * get_stored_relaxed () const
+  {
+    return this->instance.get_relaxed ();
+  }
+
+  bool cmpexch (Stored *current, Stored *value) const
+  {
+    /* This *must* be called when there are no other threads accessing. */
+    return this->instance.cmpexch (current, value);
+  }
+
+  const Returned * get () const { return Funcs::convert (get_stored ()); }
+  const Returned * get_relaxed () const { return Funcs::convert (get_stored_relaxed ()); }
+  Returned * get_unconst () const { return const_cast<Returned *> (Funcs::convert (get_stored ())); }
+
+  /* To be possibly overloaded by subclasses. */
+  static Returned* convert (Stored *p) { return p; }
+
+  /* By default null/init/fini the object. */
+  static const Stored* get_null () { return &Null (Stored); }
+  static Stored *create (Data *data)
+  {
+    Stored *p = (Stored *) calloc (1, sizeof (Stored));
+    if (likely (p))
+      p->init (data);
+    return p;
+  }
+  static Stored *create ()
+  {
+    Stored *p = (Stored *) calloc (1, sizeof (Stored));
+    if (likely (p))
+      p->init ();
+    return p;
+  }
+  static void destroy (Stored *p)
+  {
+    p->fini ();
+    free (p);
+  }
+
+//  private:
+  /* Must only have one pointer. */
+  hb_atomic_ptr_t<Stored *> instance;
+};
+
+/* Specializations. */
+
+template <typename T, unsigned int WheresFace>
+struct hb_face_lazy_loader_t : hb_lazy_loader_t<T,
+						hb_face_lazy_loader_t<T, WheresFace>,
+						hb_face_t, WheresFace> {};
+
+template <typename T, unsigned int WheresFace>
+struct hb_table_lazy_loader_t : hb_lazy_loader_t<T,
+						 hb_table_lazy_loader_t<T, WheresFace>,
+						 hb_face_t, WheresFace,
+						 hb_blob_t>
+{
+  static hb_blob_t *create (hb_face_t *face)
+  { return hb_sanitize_context_t ().reference_table<T> (face); }
+  static void destroy (hb_blob_t *p) { hb_blob_destroy (p); }
+
+  static const hb_blob_t *get_null ()
+  { return hb_blob_get_empty (); }
+
+  static const T* convert (const hb_blob_t *blob)
+  { return blob->as<T> (); }
+
+  hb_blob_t* get_blob () const { return this->get_stored (); }
+};
+
+template <typename Subclass>
+struct hb_font_funcs_lazy_loader_t : hb_lazy_loader_t<hb_font_funcs_t, Subclass>
+{
+  static void destroy (hb_font_funcs_t *p)
+  { hb_font_funcs_destroy (p); }
+  static const hb_font_funcs_t *get_null ()
+  { return hb_font_funcs_get_empty (); }
+};
+template <typename Subclass>
+struct hb_unicode_funcs_lazy_loader_t : hb_lazy_loader_t<hb_unicode_funcs_t, Subclass>
+{
+  static void destroy (hb_unicode_funcs_t *p)
+  { hb_unicode_funcs_destroy (p); }
+  static const hb_unicode_funcs_t *get_null ()
+  { return hb_unicode_funcs_get_empty (); }
+};
+
+
+#endif /* HB_MACHINERY_HH */