Update harfbuzz-ng to 1a5a91dc0d8bf4b72a2f22dc6300b06ad7000b79.

third_party/harfbuzz-ng/src/hb-unicode.cc

+/*
+ * Copyright © 2009  Red Hat, Inc.
+ * Copyright © 2011 Codethink Limited
+ * Copyright © 2010,2011  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
+ * Codethink Author(s): Ryan Lortie
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "hb-private.hh"
+
+#include "hb-unicode-private.hh"
+
+
+
+/*
+ * hb_unicode_funcs_t
+ */
+
+static unsigned int
+hb_unicode_combining_class_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
+                                hb_codepoint_t      unicode   HB_UNUSED,
+                                void               *user_data HB_UNUSED)
+{
+  return 0;
+}
+
+static unsigned int
+hb_unicode_eastasian_width_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
+                                hb_codepoint_t      unicode   HB_UNUSED,
+                                void               *user_data HB_UNUSED)
+{
+  return 1;
+}
+
+static hb_unicode_general_category_t
+hb_unicode_general_category_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
+                                 hb_codepoint_t      unicode   HB_UNUSED,
+                                 void               *user_data HB_UNUSED)
+{
+  return HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER;
+}
+
+static hb_codepoint_t
+hb_unicode_mirroring_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
+                          hb_codepoint_t      unicode   HB_UNUSED,
+                          void               *user_data HB_UNUSED)
+{
+  return unicode;
+}
+
+static hb_script_t
+hb_unicode_script_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
+                       hb_codepoint_t      unicode   HB_UNUSED,
+                       void               *user_data HB_UNUSED)
+{
+  return HB_SCRIPT_UNKNOWN;
+}
+
+static hb_bool_t
+hb_unicode_compose_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
+                        hb_codepoint_t      a         HB_UNUSED,
+                        hb_codepoint_t      b         HB_UNUSED,
+                        hb_codepoint_t     *ab        HB_UNUSED,
+                        void               *user_data HB_UNUSED)
+{
+  /* TODO handle Hangul jamo here? */
+  return FALSE;
+}
+
+static hb_bool_t
+hb_unicode_decompose_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
+                          hb_codepoint_t      ab        HB_UNUSED,
+                          hb_codepoint_t     *a         HB_UNUSED,
+                          hb_codepoint_t     *b         HB_UNUSED,
+                          void               *user_data HB_UNUSED)
+{
+  /* TODO handle Hangul jamo here? */
+  return FALSE;
+}
+
+
+hb_unicode_funcs_t _hb_unicode_funcs_nil = {
+  HB_OBJECT_HEADER_STATIC,
+
+  NULL, /* parent */
+  TRUE, /* immutable */
+  {
+#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_nil,
+    HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_UNICODE_FUNC_IMPLEMENT
+  }
+};
+
+
+hb_unicode_funcs_t *
+hb_unicode_funcs_get_default (void)
+{
+  return &_hb_unicode_funcs_default;
+}
+
+hb_unicode_funcs_t *
+hb_unicode_funcs_create (hb_unicode_funcs_t *parent)
+{
+  hb_unicode_funcs_t *ufuncs;
+
+  if (!(ufuncs = hb_object_create<hb_unicode_funcs_t> ()))
+    return &_hb_unicode_funcs_nil;
+
+  if (!parent)
+    parent = &_hb_unicode_funcs_nil;
+
+  hb_unicode_funcs_make_immutable (parent);
+  ufuncs->parent = hb_unicode_funcs_reference (parent);
+
+  ufuncs->func = parent->func;
+
+  /* We can safely copy user_data from parent since we hold a reference
+   * onto it and it's immutable.  We should not copy the destroy notifiers
+   * though. */
+  ufuncs->user_data = parent->user_data;
+
+  return ufuncs;
+}
+
+hb_unicode_funcs_t *
+hb_unicode_funcs_get_empty (void)
+{
+  return &_hb_unicode_funcs_nil;
+}
+
+hb_unicode_funcs_t *
+hb_unicode_funcs_reference (hb_unicode_funcs_t *ufuncs)
+{
+  return hb_object_reference (ufuncs);
+}
+
+void
+hb_unicode_funcs_destroy (hb_unicode_funcs_t *ufuncs)
+{
+  if (!hb_object_destroy (ufuncs)) return;
+
+#define HB_UNICODE_FUNC_IMPLEMENT(name) \
+  if (ufuncs->destroy.name) ufuncs->destroy.name (ufuncs->user_data.name);
+    HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_UNICODE_FUNC_IMPLEMENT
+
+  hb_unicode_funcs_destroy (ufuncs->parent);
+
+  free (ufuncs);
+}
+
+hb_bool_t
+hb_unicode_funcs_set_user_data (hb_unicode_funcs_t *ufuncs,
+                                hb_user_data_key_t *key,
+                                void *              data,
+                                hb_destroy_func_t   destroy,
+                                hb_bool_t           replace)
+{
+  return hb_object_set_user_data (ufuncs, key, data, destroy, replace);
+}
+
+void *
+hb_unicode_funcs_get_user_data (hb_unicode_funcs_t *ufuncs,
+                                hb_user_data_key_t *key)
+{
+  return hb_object_get_user_data (ufuncs, key);
+}
+
+
+void
+hb_unicode_funcs_make_immutable (hb_unicode_funcs_t *ufuncs)
+{
+  if (hb_object_is_inert (ufuncs))
+    return;
+
+  ufuncs->immutable = TRUE;
+}
+
+hb_bool_t
+hb_unicode_funcs_is_immutable (hb_unicode_funcs_t *ufuncs)
+{
+  return ufuncs->immutable;
+}
+
+hb_unicode_funcs_t *
+hb_unicode_funcs_get_parent (hb_unicode_funcs_t *ufuncs)
+{
+  return ufuncs->parent ? ufuncs->parent : &_hb_unicode_funcs_nil;
+}
+
+
+#define HB_UNICODE_FUNC_IMPLEMENT(name)                                         \
+                                                                                \
+void                                                                            \
+hb_unicode_funcs_set_##name##_func (hb_unicode_funcs_t             *ufuncs,     \
+                                    hb_unicode_##name##_func_t      func,       \
+                                    void                           *user_data,  \
+                                    hb_destroy_func_t               destroy)    \
+{                                                                               \
+  if (ufuncs->immutable)                                                        \
+    return;                                                                     \
+                                                                                \
+  if (ufuncs->destroy.name)                                                     \
+    ufuncs->destroy.name (ufuncs->user_data.name);                              \
+                                                                                \
+  if (func) {                                                                   \
+    ufuncs->func.name = func;                                                   \
+    ufuncs->user_data.name = user_data;                                         \
+    ufuncs->destroy.name = destroy;                                             \
+  } else {                                                                      \
+    ufuncs->func.name = ufuncs->parent->func.name;                              \
+    ufuncs->user_data.name = ufuncs->parent->user_data.name;                    \
+    ufuncs->destroy.name = NULL;                                                \
+  }                                                                             \
+}
+
+    HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_UNICODE_FUNC_IMPLEMENT
+
+
+#define HB_UNICODE_FUNC_IMPLEMENT(return_type, name)                            \
+                                                                                \
+return_type                                                                     \
+hb_unicode_##name (hb_unicode_funcs_t *ufuncs,                                  \
+                   hb_codepoint_t      unicode)                                 \
+{                                                                               \
+  return ufuncs->func.name (ufuncs, unicode, ufuncs->user_data.name);           \
+}
+    HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE
+#undef HB_UNICODE_FUNC_IMPLEMENT
+
+hb_bool_t
+hb_unicode_compose (hb_unicode_funcs_t *ufuncs,
+                    hb_codepoint_t      a,
+                    hb_codepoint_t      b,
+                    hb_codepoint_t     *ab)
+{
+  *ab = 0;
+  return ufuncs->func.compose (ufuncs, a, b, ab, ufuncs->user_data.compose);
+}
+
+hb_bool_t
+hb_unicode_decompose (hb_unicode_funcs_t *ufuncs,
+                      hb_codepoint_t      ab,
+                      hb_codepoint_t     *a,
+                      hb_codepoint_t     *b)
+{
+  *a = ab; *b = 0;
+  return ufuncs->func.decompose (ufuncs, ab, a, b, ufuncs->user_data.decompose);
+}
+