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diff --git a/thirdparty/harfbuzz/src/hb-buffer.cc b/thirdparty/harfbuzz/src/hb-buffer.cc
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+/*
+ * Copyright © 1998-2004 David Turner and Werner Lemberg
+ * Copyright © 2004,2007,2009,2010 Red Hat, Inc.
+ * Copyright © 2011,2012 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): Owen Taylor, Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "hb-buffer.hh"
+#include "hb-utf.hh"
+
+
+/**
+ * SECTION: hb-buffer
+ * @title: hb-buffer
+ * @short_description: Input and output buffers
+ * @include: hb.h
+ *
+ * Buffers serve a dual role in HarfBuzz; before shaping, they hold
+ * the input characters that are passed to hb_shape(), and after
+ * shaping they hold the output glyphs.
+ **/
+
+
+/**
+ * hb_segment_properties_equal:
+ * @a: first #hb_segment_properties_t to compare.
+ * @b: second #hb_segment_properties_t to compare.
+ *
+ * Checks the equality of two #hb_segment_properties_t's.
+ *
+ * Return value:
+ * `true` if all properties of @a equal those of @b, `false` otherwise.
+ *
+ * Since: 0.9.7
+ **/
+hb_bool_t
+hb_segment_properties_equal (const hb_segment_properties_t *a,
+ const hb_segment_properties_t *b)
+{
+ return a->direction == b->direction &&
+ a->script == b->script &&
+ a->language == b->language &&
+ a->reserved1 == b->reserved1 &&
+ a->reserved2 == b->reserved2;
+
+}
+
+/**
+ * hb_segment_properties_hash:
+ * @p: #hb_segment_properties_t to hash.
+ *
+ * Creates a hash representing @p.
+ *
+ * Return value:
+ * A hash of @p.
+ *
+ * Since: 0.9.7
+ **/
+unsigned int
+hb_segment_properties_hash (const hb_segment_properties_t *p)
+{
+ return ((unsigned int) p->direction * 31 +
+ (unsigned int) p->script) * 31 +
+ (intptr_t) (p->language);
+}
+
+/**
+ * hb_segment_properties_overlay:
+ * @p: #hb_segment_properties_t to fill in.
+ * @src: #hb_segment_properties_t to fill in from.
+ *
+ * Fills in missing fields of @p from @src in a considered manner.
+ *
+ * First, if @p does not have direction set, direction is copied from @src.
+ *
+ * Next, if @p and @src have the same direction (which can be unset), if @p
+ * does not have script set, script is copied from @src.
+ *
+ * Finally, if @p and @src have the same direction and script (which either
+ * can be unset), if @p does not have language set, language is copied from
+ * @src.
+ *
+ * Since: 3.3.0
+ **/
+void
+hb_segment_properties_overlay (hb_segment_properties_t *p,
+ const hb_segment_properties_t *src)
+{
+ if (unlikely (!p || !src))
+ return;
+
+ if (!p->direction)
+ p->direction = src->direction;
+
+ if (p->direction != src->direction)
+ return;
+
+ if (!p->script)
+ p->script = src->script;
+
+ if (p->script != src->script)
+ return;
+
+ if (!p->language)
+ p->language = src->language;
+}
+
+/* Here is how the buffer works internally:
+ *
+ * There are two info pointers: info and out_info. They always have
+ * the same allocated size, but different lengths.
+ *
+ * As an optimization, both info and out_info may point to the
+ * same piece of memory, which is owned by info. This remains the
+ * case as long as out_len doesn't exceed i at any time.
+ * In that case, sync() is mostly no-op and the glyph operations
+ * operate mostly in-place.
+ *
+ * As soon as out_info gets longer than info, out_info is moved over
+ * to an alternate buffer (which we reuse the pos buffer for), and its
+ * current contents (out_len entries) are copied to the new place.
+ *
+ * This should all remain transparent to the user. sync() then
+ * switches info over to out_info and does housekeeping.
+ */
+
+
+
+/* Internal API */
+
+bool
+hb_buffer_t::enlarge (unsigned int size)
+{
+ if (unlikely (!successful))
+ return false;
+ if (unlikely (size > max_len))
+ {
+ successful = false;
+ return false;
+ }
+
+ unsigned int new_allocated = allocated;
+ hb_glyph_position_t *new_pos = nullptr;
+ hb_glyph_info_t *new_info = nullptr;
+ bool separate_out = out_info != info;
+
+ if (unlikely (hb_unsigned_mul_overflows (size, sizeof (info[0]))))
+ goto done;
+
+ while (size >= new_allocated)
+ new_allocated += (new_allocated >> 1) + 32;
+
+ static_assert ((sizeof (info[0]) == sizeof (pos[0])), "");
+ if (unlikely (hb_unsigned_mul_overflows (new_allocated, sizeof (info[0]))))
+ goto done;
+
+ new_pos = (hb_glyph_position_t *) hb_realloc (pos, new_allocated * sizeof (pos[0]));
+ new_info = (hb_glyph_info_t *) hb_realloc (info, new_allocated * sizeof (info[0]));
+
+done:
+ if (unlikely (!new_pos || !new_info))
+ successful = false;
+
+ if (likely (new_pos))
+ pos = new_pos;
+
+ if (likely (new_info))
+ info = new_info;
+
+ out_info = separate_out ? (hb_glyph_info_t *) pos : info;
+ if (likely (successful))
+ allocated = new_allocated;
+
+ return likely (successful);
+}
+
+bool
+hb_buffer_t::make_room_for (unsigned int num_in,
+ unsigned int num_out)
+{
+ if (unlikely (!ensure (out_len + num_out))) return false;
+
+ if (out_info == info &&
+ out_len + num_out > idx + num_in)
+ {
+ assert (have_output);
+
+ out_info = (hb_glyph_info_t *) pos;
+ memcpy (out_info, info, out_len * sizeof (out_info[0]));
+ }
+
+ return true;
+}
+
+bool
+hb_buffer_t::shift_forward (unsigned int count)
+{
+ assert (have_output);
+ if (unlikely (!ensure (len + count))) return false;
+
+ memmove (info + idx + count, info + idx, (len - idx) * sizeof (info[0]));
+ if (idx + count > len)
+ {
+ /* Under memory failure we might expose this area. At least
+ * clean it up. Oh well...
+ *
+ * Ideally, we should at least set Default_Ignorable bits on
+ * these, as well as consistent cluster values. But the former
+ * is layering violation... */
+ memset (info + len, 0, (idx + count - len) * sizeof (info[0]));
+ }
+ len += count;
+ idx += count;
+
+ return true;
+}
+
+hb_buffer_t::scratch_buffer_t *
+hb_buffer_t::get_scratch_buffer (unsigned int *size)
+{
+ have_output = false;
+ have_positions = false;
+
+ out_len = 0;
+ out_info = info;
+
+ assert ((uintptr_t) pos % sizeof (scratch_buffer_t) == 0);
+ *size = allocated * sizeof (pos[0]) / sizeof (scratch_buffer_t);
+ return (scratch_buffer_t *) (void *) pos;
+}
+
+
+
+/* HarfBuzz-Internal API */
+
+void
+hb_buffer_t::similar (const hb_buffer_t &src)
+{
+ hb_unicode_funcs_destroy (unicode);
+ unicode = hb_unicode_funcs_reference (src.unicode);
+ flags = src.flags;
+ cluster_level = src.cluster_level;
+ replacement = src.invisible;
+ invisible = src.invisible;
+ not_found = src.not_found;
+}
+
+void
+hb_buffer_t::reset ()
+{
+ hb_unicode_funcs_destroy (unicode);
+ unicode = hb_unicode_funcs_reference (hb_unicode_funcs_get_default ());
+ flags = HB_BUFFER_FLAG_DEFAULT;
+ cluster_level = HB_BUFFER_CLUSTER_LEVEL_DEFAULT;
+ replacement = HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT;
+ invisible = 0;
+ not_found = 0;
+
+ clear ();
+}
+
+void
+hb_buffer_t::clear ()
+{
+ content_type = HB_BUFFER_CONTENT_TYPE_INVALID;
+ hb_segment_properties_t default_props = HB_SEGMENT_PROPERTIES_DEFAULT;
+ props = default_props;
+
+ successful = true;
+ shaping_failed = false;
+ have_output = false;
+ have_positions = false;
+
+ idx = 0;
+ len = 0;
+ out_len = 0;
+ out_info = info;
+
+ memset (context, 0, sizeof context);
+ memset (context_len, 0, sizeof context_len);
+
+ deallocate_var_all ();
+ serial = 0;
+ scratch_flags = HB_BUFFER_SCRATCH_FLAG_DEFAULT;
+}
+
+void
+hb_buffer_t::enter ()
+{
+ deallocate_var_all ();
+ serial = 0;
+ shaping_failed = false;
+ scratch_flags = HB_BUFFER_SCRATCH_FLAG_DEFAULT;
+ if (likely (!hb_unsigned_mul_overflows (len, HB_BUFFER_MAX_LEN_FACTOR)))
+ {
+ max_len = hb_max (len * HB_BUFFER_MAX_LEN_FACTOR,
+ (unsigned) HB_BUFFER_MAX_LEN_MIN);
+ }
+ if (likely (!hb_unsigned_mul_overflows (len, HB_BUFFER_MAX_OPS_FACTOR)))
+ {
+ max_ops = hb_max (len * HB_BUFFER_MAX_OPS_FACTOR,
+ (unsigned) HB_BUFFER_MAX_OPS_MIN);
+ }
+}
+void
+hb_buffer_t::leave ()
+{
+ max_len = HB_BUFFER_MAX_LEN_DEFAULT;
+ max_ops = HB_BUFFER_MAX_OPS_DEFAULT;
+ deallocate_var_all ();
+ serial = 0;
+ // Intentionally not reseting shaping_failed, such that it can be inspected.
+}
+
+
+void
+hb_buffer_t::add (hb_codepoint_t codepoint,
+ unsigned int cluster)
+{
+ hb_glyph_info_t *glyph;
+
+ if (unlikely (!ensure (len + 1))) return;
+
+ glyph = &info[len];
+
+ memset (glyph, 0, sizeof (*glyph));
+ glyph->codepoint = codepoint;
+ glyph->mask = 0;
+ glyph->cluster = cluster;
+
+ len++;
+}
+
+void
+hb_buffer_t::add_info (const hb_glyph_info_t &glyph_info)
+{
+ if (unlikely (!ensure (len + 1))) return;
+
+ info[len] = glyph_info;
+
+ len++;
+}
+
+
+void
+hb_buffer_t::clear_output ()
+{
+ have_output = true;
+ have_positions = false;
+
+ idx = 0;
+ out_len = 0;
+ out_info = info;
+}
+
+void
+hb_buffer_t::clear_positions ()
+{
+ have_output = false;
+ have_positions = true;
+
+ out_len = 0;
+ out_info = info;
+
+ hb_memset (pos, 0, sizeof (pos[0]) * len);
+}
+
+bool
+hb_buffer_t::sync ()
+{
+ bool ret = false;
+
+ assert (have_output);
+
+ assert (idx <= len);
+
+ if (unlikely (!successful || !next_glyphs (len - idx)))
+ goto reset;
+
+ if (out_info != info)
+ {
+ pos = (hb_glyph_position_t *) info;
+ info = out_info;
+ }
+ len = out_len;
+ ret = true;
+
+reset:
+ have_output = false;
+ out_len = 0;
+ out_info = info;
+ idx = 0;
+
+ return ret;
+}
+
+int
+hb_buffer_t::sync_so_far ()
+{
+ bool had_output = have_output;
+ unsigned out_i = out_len;
+ unsigned i = idx;
+ unsigned old_idx = idx;
+
+ if (sync ())
+ idx = out_i;
+ else
+ idx = i;
+
+ if (had_output)
+ {
+ have_output = true;
+ out_len = idx;
+ }
+
+ assert (idx <= len);
+
+ return idx - old_idx;
+}
+
+bool
+hb_buffer_t::move_to (unsigned int i)
+{
+ if (!have_output)
+ {
+ assert (i <= len);
+ idx = i;
+ return true;
+ }
+ if (unlikely (!successful))
+ return false;
+
+ assert (i <= out_len + (len - idx));
+
+ if (out_len < i)
+ {
+ unsigned int count = i - out_len;
+ if (unlikely (!make_room_for (count, count))) return false;
+
+ memmove (out_info + out_len, info + idx, count * sizeof (out_info[0]));
+ idx += count;
+ out_len += count;
+ }
+ else if (out_len > i)
+ {
+ /* Tricky part: rewinding... */
+ unsigned int count = out_len - i;
+
+ /* This will blow in our face if memory allocation fails later
+ * in this same lookup...
+ *
+ * We used to shift with extra 32 items.
+ * But that would leave empty slots in the buffer in case of allocation
+ * failures. See comments in shift_forward(). This can cause O(N^2)
+ * behavior more severely than adding 32 empty slots can... */
+ if (unlikely (idx < count && !shift_forward (count - idx))) return false;
+
+ assert (idx >= count);
+
+ idx -= count;
+ out_len -= count;
+ memmove (info + idx, out_info + out_len, count * sizeof (out_info[0]));
+ }
+
+ return true;
+}
+
+
+void
+hb_buffer_t::set_masks (hb_mask_t value,
+ hb_mask_t mask,
+ unsigned int cluster_start,
+ unsigned int cluster_end)
+{
+ hb_mask_t not_mask = ~mask;
+ value &= mask;
+
+ if (!mask)
+ return;
+
+ unsigned int count = len;
+ for (unsigned int i = 0; i < count; i++)
+ if (cluster_start <= info[i].cluster && info[i].cluster < cluster_end)
+ info[i].mask = (info[i].mask & not_mask) | value;
+}
+
+void
+hb_buffer_t::merge_clusters_impl (unsigned int start,
+ unsigned int end)
+{
+ if (cluster_level == HB_BUFFER_CLUSTER_LEVEL_CHARACTERS)
+ {
+ unsafe_to_break (start, end);
+ return;
+ }
+
+ unsigned int cluster = info[start].cluster;
+
+ for (unsigned int i = start + 1; i < end; i++)
+ cluster = hb_min (cluster, info[i].cluster);
+
+ /* Extend end */
+ while (end < len && info[end - 1].cluster == info[end].cluster)
+ end++;
+
+ /* Extend start */
+ while (idx < start && info[start - 1].cluster == info[start].cluster)
+ start--;
+
+ /* If we hit the start of buffer, continue in out-buffer. */
+ if (idx == start)
+ for (unsigned int i = out_len; i && out_info[i - 1].cluster == info[start].cluster; i--)
+ set_cluster (out_info[i - 1], cluster);
+
+ for (unsigned int i = start; i < end; i++)
+ set_cluster (info[i], cluster);
+}
+void
+hb_buffer_t::merge_out_clusters (unsigned int start,
+ unsigned int end)
+{
+ if (cluster_level == HB_BUFFER_CLUSTER_LEVEL_CHARACTERS)
+ return;
+
+ if (unlikely (end - start < 2))
+ return;
+
+ unsigned int cluster = out_info[start].cluster;
+
+ for (unsigned int i = start + 1; i < end; i++)
+ cluster = hb_min (cluster, out_info[i].cluster);
+
+ /* Extend start */
+ while (start && out_info[start - 1].cluster == out_info[start].cluster)
+ start--;
+
+ /* Extend end */
+ while (end < out_len && out_info[end - 1].cluster == out_info[end].cluster)
+ end++;
+
+ /* If we hit the end of out-buffer, continue in buffer. */
+ if (end == out_len)
+ for (unsigned int i = idx; i < len && info[i].cluster == out_info[end - 1].cluster; i++)
+ set_cluster (info[i], cluster);
+
+ for (unsigned int i = start; i < end; i++)
+ set_cluster (out_info[i], cluster);
+}
+void
+hb_buffer_t::delete_glyph ()
+{
+ /* The logic here is duplicated in hb_ot_hide_default_ignorables(). */
+
+ unsigned int cluster = info[idx].cluster;
+ if ((idx + 1 < len && cluster == info[idx + 1].cluster) ||
+ (out_len && cluster == out_info[out_len - 1].cluster))
+ {
+ /* Cluster survives; do nothing. */
+ goto done;
+ }
+
+ if (out_len)
+ {
+ /* Merge cluster backward. */
+ if (cluster < out_info[out_len - 1].cluster)
+ {
+ unsigned int mask = info[idx].mask;
+ unsigned int old_cluster = out_info[out_len - 1].cluster;
+ for (unsigned i = out_len; i && out_info[i - 1].cluster == old_cluster; i--)
+ set_cluster (out_info[i - 1], cluster, mask);
+ }
+ goto done;
+ }
+
+ if (idx + 1 < len)
+ {
+ /* Merge cluster forward. */
+ merge_clusters (idx, idx + 2);
+ goto done;
+ }
+
+done:
+ skip_glyph ();
+}
+
+void
+hb_buffer_t::guess_segment_properties ()
+{
+ assert_unicode ();
+
+ /* If script is set to INVALID, guess from buffer contents */
+ if (props.script == HB_SCRIPT_INVALID) {
+ for (unsigned int i = 0; i < len; i++) {
+ hb_script_t script = unicode->script (info[i].codepoint);
+ if (likely (script != HB_SCRIPT_COMMON &&
+ script != HB_SCRIPT_INHERITED &&
+ script != HB_SCRIPT_UNKNOWN)) {
+ props.script = script;
+ break;
+ }
+ }
+ }
+
+ /* If direction is set to INVALID, guess from script */
+ if (props.direction == HB_DIRECTION_INVALID) {
+ props.direction = hb_script_get_horizontal_direction (props.script);
+ if (props.direction == HB_DIRECTION_INVALID)
+ props.direction = HB_DIRECTION_LTR;
+ }
+
+ /* If language is not set, use default language from locale */
+ if (props.language == HB_LANGUAGE_INVALID) {
+ /* TODO get_default_for_script? using $LANGUAGE */
+ props.language = hb_language_get_default ();
+ }
+}
+
+
+/* Public API */
+
+DEFINE_NULL_INSTANCE (hb_buffer_t) =
+{
+ HB_OBJECT_HEADER_STATIC,
+
+ const_cast<hb_unicode_funcs_t *> (&_hb_Null_hb_unicode_funcs_t),
+ HB_BUFFER_FLAG_DEFAULT,
+ HB_BUFFER_CLUSTER_LEVEL_DEFAULT,
+ HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT,
+ 0, /* invisible */
+ 0, /* not_found */
+
+
+ HB_BUFFER_CONTENT_TYPE_INVALID,
+ HB_SEGMENT_PROPERTIES_DEFAULT,
+
+ false, /* successful */
+ true, /* shaping_failed */
+ false, /* have_output */
+ true /* have_positions */
+
+ /* Zero is good enough for everything else. */
+};
+
+
+/**
+ * hb_buffer_create:
+ *
+ * Creates a new #hb_buffer_t with all properties to defaults.
+ *
+ * Return value: (transfer full):
+ * A newly allocated #hb_buffer_t with a reference count of 1. The initial
+ * reference count should be released with hb_buffer_destroy() when you are done
+ * using the #hb_buffer_t. This function never returns `NULL`. If memory cannot
+ * be allocated, a special #hb_buffer_t object will be returned on which
+ * hb_buffer_allocation_successful() returns `false`.
+ *
+ * Since: 0.9.2
+ **/
+hb_buffer_t *
+hb_buffer_create ()
+{
+ hb_buffer_t *buffer;
+
+ if (!(buffer = hb_object_create<hb_buffer_t> ()))
+ return hb_buffer_get_empty ();
+
+ buffer->max_len = HB_BUFFER_MAX_LEN_DEFAULT;
+ buffer->max_ops = HB_BUFFER_MAX_OPS_DEFAULT;
+
+ buffer->reset ();
+
+ return buffer;
+}
+
+/**
+ * hb_buffer_create_similar:
+ * @src: An #hb_buffer_t
+ *
+ * Creates a new #hb_buffer_t, similar to hb_buffer_create(). The only
+ * difference is that the buffer is configured similarly to @src.
+ *
+ * Return value: (transfer full):
+ * A newly allocated #hb_buffer_t, similar to hb_buffer_create().
+ *
+ * Since: 3.3.0
+ **/
+hb_buffer_t *
+hb_buffer_create_similar (const hb_buffer_t *src)
+{
+ hb_buffer_t *buffer = hb_buffer_create ();
+
+ buffer->similar (*src);
+
+ return buffer;
+}
+
+/**
+ * hb_buffer_reset:
+ * @buffer: An #hb_buffer_t
+ *
+ * Resets the buffer to its initial status, as if it was just newly created
+ * with hb_buffer_create().
+ *
+ * Since: 0.9.2
+ **/
+void
+hb_buffer_reset (hb_buffer_t *buffer)
+{
+ if (unlikely (hb_object_is_immutable (buffer)))
+ return;
+
+ buffer->reset ();
+}
+
+/**
+ * hb_buffer_get_empty:
+ *
+ * Fetches an empty #hb_buffer_t.
+ *
+ * Return value: (transfer full): The empty buffer
+ *
+ * Since: 0.9.2
+ **/
+hb_buffer_t *
+hb_buffer_get_empty ()
+{
+ return const_cast<hb_buffer_t *> (&Null (hb_buffer_t));
+}
+
+/**
+ * hb_buffer_reference: (skip)
+ * @buffer: An #hb_buffer_t
+ *
+ * Increases the reference count on @buffer by one. This prevents @buffer from
+ * being destroyed until a matching call to hb_buffer_destroy() is made.
+ *
+ * Return value: (transfer full):
+ * The referenced #hb_buffer_t.
+ *
+ * Since: 0.9.2
+ **/
+hb_buffer_t *
+hb_buffer_reference (hb_buffer_t *buffer)
+{
+ return hb_object_reference (buffer);
+}
+
+/**
+ * hb_buffer_destroy: (skip)
+ * @buffer: An #hb_buffer_t
+ *
+ * Deallocate the @buffer.
+ * Decreases the reference count on @buffer by one. If the result is zero, then
+ * @buffer and all associated resources are freed. See hb_buffer_reference().
+ *
+ * Since: 0.9.2
+ **/
+void
+hb_buffer_destroy (hb_buffer_t *buffer)
+{
+ if (!hb_object_destroy (buffer)) return;
+
+ hb_unicode_funcs_destroy (buffer->unicode);
+
+ hb_free (buffer->info);
+ hb_free (buffer->pos);
+#ifndef HB_NO_BUFFER_MESSAGE
+ if (buffer->message_destroy)
+ buffer->message_destroy (buffer->message_data);
+#endif
+
+ hb_free (buffer);
+}
+
+/**
+ * hb_buffer_set_user_data: (skip)
+ * @buffer: An #hb_buffer_t
+ * @key: The user-data key
+ * @data: A pointer to the user data
+ * @destroy: (nullable): A callback to call when @data is not needed anymore
+ * @replace: Whether to replace an existing data with the same key
+ *
+ * Attaches a user-data key/data pair to the specified buffer.
+ *
+ * Return value: `true` if success, `false` otherwise
+ *
+ * Since: 0.9.2
+ **/
+hb_bool_t
+hb_buffer_set_user_data (hb_buffer_t *buffer,
+ hb_user_data_key_t *key,
+ void * data,
+ hb_destroy_func_t destroy,
+ hb_bool_t replace)
+{
+ return hb_object_set_user_data (buffer, key, data, destroy, replace);
+}
+
+/**
+ * hb_buffer_get_user_data: (skip)
+ * @buffer: An #hb_buffer_t
+ * @key: The user-data key to query
+ *
+ * Fetches the user data associated with the specified key,
+ * attached to the specified buffer.
+ *
+ * Return value: (transfer none): A pointer to the user data
+ *
+ * Since: 0.9.2
+ **/
+void *
+hb_buffer_get_user_data (const hb_buffer_t *buffer,
+ hb_user_data_key_t *key)
+{
+ return hb_object_get_user_data (buffer, key);
+}
+
+
+/**
+ * hb_buffer_set_content_type:
+ * @buffer: An #hb_buffer_t
+ * @content_type: The type of buffer contents to set
+ *
+ * Sets the type of @buffer contents. Buffers are either empty, contain
+ * characters (before shaping), or contain glyphs (the result of shaping).
+ *
+ * Since: 0.9.5
+ **/
+void
+hb_buffer_set_content_type (hb_buffer_t *buffer,
+ hb_buffer_content_type_t content_type)
+{
+ buffer->content_type = content_type;
+}
+
+/**
+ * hb_buffer_get_content_type:
+ * @buffer: An #hb_buffer_t
+ *
+ * Fetches the type of @buffer contents. Buffers are either empty, contain
+ * characters (before shaping), or contain glyphs (the result of shaping).
+ *
+ * Return value:
+ * The type of @buffer contents
+ *
+ * Since: 0.9.5
+ **/
+hb_buffer_content_type_t
+hb_buffer_get_content_type (const hb_buffer_t *buffer)
+{
+ return buffer->content_type;
+}
+
+
+/**
+ * hb_buffer_set_unicode_funcs:
+ * @buffer: An #hb_buffer_t
+ * @unicode_funcs: The Unicode-functions structure
+ *
+ * Sets the Unicode-functions structure of a buffer to
+ * @unicode_funcs.
+ *
+ * Since: 0.9.2
+ **/
+void
+hb_buffer_set_unicode_funcs (hb_buffer_t *buffer,
+ hb_unicode_funcs_t *unicode_funcs)
+{
+ if (unlikely (hb_object_is_immutable (buffer)))
+ return;
+
+ if (!unicode_funcs)
+ unicode_funcs = hb_unicode_funcs_get_default ();
+
+ hb_unicode_funcs_reference (unicode_funcs);
+ hb_unicode_funcs_destroy (buffer->unicode);
+ buffer->unicode = unicode_funcs;
+}
+
+/**
+ * hb_buffer_get_unicode_funcs:
+ * @buffer: An #hb_buffer_t
+ *
+ * Fetches the Unicode-functions structure of a buffer.
+ *
+ * Return value: The Unicode-functions structure
+ *
+ * Since: 0.9.2
+ **/
+hb_unicode_funcs_t *
+hb_buffer_get_unicode_funcs (const hb_buffer_t *buffer)
+{
+ return buffer->unicode;
+}
+
+/**
+ * hb_buffer_set_direction:
+ * @buffer: An #hb_buffer_t
+ * @direction: the #hb_direction_t of the @buffer
+ *
+ * Set the text flow direction of the buffer. No shaping can happen without
+ * setting @buffer direction, and it controls the visual direction for the
+ * output glyphs; for RTL direction the glyphs will be reversed. Many layout
+ * features depend on the proper setting of the direction, for example,
+ * reversing RTL text before shaping, then shaping with LTR direction is not
+ * the same as keeping the text in logical order and shaping with RTL
+ * direction.
+ *
+ * Since: 0.9.2
+ **/
+void
+hb_buffer_set_direction (hb_buffer_t *buffer,
+ hb_direction_t direction)
+
+{
+ if (unlikely (hb_object_is_immutable (buffer)))
+ return;
+
+ buffer->props.direction = direction;
+}
+
+/**
+ * hb_buffer_get_direction:
+ * @buffer: An #hb_buffer_t
+ *
+ * See hb_buffer_set_direction()
+ *
+ * Return value:
+ * The direction of the @buffer.
+ *
+ * Since: 0.9.2
+ **/
+hb_direction_t
+hb_buffer_get_direction (const hb_buffer_t *buffer)
+{
+ return buffer->props.direction;
+}
+
+/**
+ * hb_buffer_set_script:
+ * @buffer: An #hb_buffer_t
+ * @script: An #hb_script_t to set.
+ *
+ * Sets the script of @buffer to @script.
+ *
+ * Script is crucial for choosing the proper shaping behaviour for scripts that
+ * require it (e.g. Arabic) and the which OpenType features defined in the font
+ * to be applied.
+ *
+ * You can pass one of the predefined #hb_script_t values, or use
+ * hb_script_from_string() or hb_script_from_iso15924_tag() to get the
+ * corresponding script from an ISO 15924 script tag.
+ *
+ * Since: 0.9.2
+ **/
+void
+hb_buffer_set_script (hb_buffer_t *buffer,
+ hb_script_t script)
+{
+ if (unlikely (hb_object_is_immutable (buffer)))
+ return;
+
+ buffer->props.script = script;
+}
+
+/**
+ * hb_buffer_get_script:
+ * @buffer: An #hb_buffer_t
+ *
+ * Fetches the script of @buffer.
+ *
+ * Return value:
+ * The #hb_script_t of the @buffer
+ *
+ * Since: 0.9.2
+ **/
+hb_script_t
+hb_buffer_get_script (const hb_buffer_t *buffer)
+{
+ return buffer->props.script;
+}
+
+/**
+ * hb_buffer_set_language:
+ * @buffer: An #hb_buffer_t
+ * @language: An hb_language_t to set
+ *
+ * Sets the language of @buffer to @language.
+ *
+ * Languages are crucial for selecting which OpenType feature to apply to the
+ * buffer which can result in applying language-specific behaviour. Languages
+ * are orthogonal to the scripts, and though they are related, they are
+ * different concepts and should not be confused with each other.
+ *
+ * Use hb_language_from_string() to convert from BCP 47 language tags to
+ * #hb_language_t.
+ *
+ * Since: 0.9.2
+ **/
+void
+hb_buffer_set_language (hb_buffer_t *buffer,
+ hb_language_t language)
+{
+ if (unlikely (hb_object_is_immutable (buffer)))
+ return;
+
+ buffer->props.language = language;
+}
+
+/**
+ * hb_buffer_get_language:
+ * @buffer: An #hb_buffer_t
+ *
+ * See hb_buffer_set_language().
+ *
+ * Return value: (transfer none):
+ * The #hb_language_t of the buffer. Must not be freed by the caller.
+ *
+ * Since: 0.9.2
+ **/
+hb_language_t
+hb_buffer_get_language (const hb_buffer_t *buffer)
+{
+ return buffer->props.language;
+}
+
+/**
+ * hb_buffer_set_segment_properties:
+ * @buffer: An #hb_buffer_t
+ * @props: An #hb_segment_properties_t to use
+ *
+ * Sets the segment properties of the buffer, a shortcut for calling
+ * hb_buffer_set_direction(), hb_buffer_set_script() and
+ * hb_buffer_set_language() individually.
+ *
+ * Since: 0.9.7
+ **/
+void
+hb_buffer_set_segment_properties (hb_buffer_t *buffer,
+ const hb_segment_properties_t *props)
+{
+ if (unlikely (hb_object_is_immutable (buffer)))
+ return;
+
+ buffer->props = *props;
+}
+
+/**
+ * hb_buffer_get_segment_properties:
+ * @buffer: An #hb_buffer_t
+ * @props: (out): The output #hb_segment_properties_t
+ *
+ * Sets @props to the #hb_segment_properties_t of @buffer.
+ *
+ * Since: 0.9.7
+ **/
+void
+hb_buffer_get_segment_properties (const hb_buffer_t *buffer,
+ hb_segment_properties_t *props)
+{
+ *props = buffer->props;
+}
+
+
+/**
+ * hb_buffer_set_flags:
+ * @buffer: An #hb_buffer_t
+ * @flags: The buffer flags to set
+ *
+ * Sets @buffer flags to @flags. See #hb_buffer_flags_t.
+ *
+ * Since: 0.9.7
+ **/
+void
+hb_buffer_set_flags (hb_buffer_t *buffer,
+ hb_buffer_flags_t flags)
+{
+ if (unlikely (hb_object_is_immutable (buffer)))
+ return;
+
+ buffer->flags = flags;
+}
+
+/**
+ * hb_buffer_get_flags:
+ * @buffer: An #hb_buffer_t
+ *
+ * Fetches the #hb_buffer_flags_t of @buffer.
+ *
+ * Return value:
+ * The @buffer flags
+ *
+ * Since: 0.9.7
+ **/
+hb_buffer_flags_t
+hb_buffer_get_flags (const hb_buffer_t *buffer)
+{
+ return buffer->flags;
+}
+
+/**
+ * hb_buffer_set_cluster_level:
+ * @buffer: An #hb_buffer_t
+ * @cluster_level: The cluster level to set on the buffer
+ *
+ * Sets the cluster level of a buffer. The #hb_buffer_cluster_level_t
+ * dictates one aspect of how HarfBuzz will treat non-base characters
+ * during shaping.
+ *
+ * Since: 0.9.42
+ **/
+void
+hb_buffer_set_cluster_level (hb_buffer_t *buffer,
+ hb_buffer_cluster_level_t cluster_level)
+{
+ if (unlikely (hb_object_is_immutable (buffer)))
+ return;
+
+ buffer->cluster_level = cluster_level;
+}
+
+/**
+ * hb_buffer_get_cluster_level:
+ * @buffer: An #hb_buffer_t
+ *
+ * Fetches the cluster level of a buffer. The #hb_buffer_cluster_level_t
+ * dictates one aspect of how HarfBuzz will treat non-base characters
+ * during shaping.
+ *
+ * Return value: The cluster level of @buffer
+ *
+ * Since: 0.9.42
+ **/
+hb_buffer_cluster_level_t
+hb_buffer_get_cluster_level (const hb_buffer_t *buffer)
+{
+ return buffer->cluster_level;
+}
+
+
+/**
+ * hb_buffer_set_replacement_codepoint:
+ * @buffer: An #hb_buffer_t
+ * @replacement: the replacement #hb_codepoint_t
+ *
+ * Sets the #hb_codepoint_t that replaces invalid entries for a given encoding
+ * when adding text to @buffer.
+ *
+ * Default is #HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT.
+ *
+ * Since: 0.9.31
+ **/
+void
+hb_buffer_set_replacement_codepoint (hb_buffer_t *buffer,
+ hb_codepoint_t replacement)
+{
+ if (unlikely (hb_object_is_immutable (buffer)))
+ return;
+
+ buffer->replacement = replacement;
+}
+
+/**
+ * hb_buffer_get_replacement_codepoint:
+ * @buffer: An #hb_buffer_t
+ *
+ * Fetches the #hb_codepoint_t that replaces invalid entries for a given encoding
+ * when adding text to @buffer.
+ *
+ * Return value:
+ * The @buffer replacement #hb_codepoint_t
+ *
+ * Since: 0.9.31
+ **/
+hb_codepoint_t
+hb_buffer_get_replacement_codepoint (const hb_buffer_t *buffer)
+{
+ return buffer->replacement;
+}
+
+
+/**
+ * hb_buffer_set_invisible_glyph:
+ * @buffer: An #hb_buffer_t
+ * @invisible: the invisible #hb_codepoint_t
+ *
+ * Sets the #hb_codepoint_t that replaces invisible characters in
+ * the shaping result. If set to zero (default), the glyph for the
+ * U+0020 SPACE character is used. Otherwise, this value is used
+ * verbatim.
+ *
+ * Since: 2.0.0
+ **/
+void
+hb_buffer_set_invisible_glyph (hb_buffer_t *buffer,
+ hb_codepoint_t invisible)
+{
+ if (unlikely (hb_object_is_immutable (buffer)))
+ return;
+
+ buffer->invisible = invisible;
+}
+
+/**
+ * hb_buffer_get_invisible_glyph:
+ * @buffer: An #hb_buffer_t
+ *
+ * See hb_buffer_set_invisible_glyph().
+ *
+ * Return value:
+ * The @buffer invisible #hb_codepoint_t
+ *
+ * Since: 2.0.0
+ **/
+hb_codepoint_t
+hb_buffer_get_invisible_glyph (const hb_buffer_t *buffer)
+{
+ return buffer->invisible;
+}
+
+/**
+ * hb_buffer_set_not_found_glyph:
+ * @buffer: An #hb_buffer_t
+ * @not_found: the not-found #hb_codepoint_t
+ *
+ * Sets the #hb_codepoint_t that replaces characters not found in
+ * the font during shaping.
+ *
+ * The not-found glyph defaults to zero, sometimes knows as the
+ * ".notdef" glyph. This API allows for differentiating the two.
+ *
+ * Since: 3.1.0
+ **/
+void
+hb_buffer_set_not_found_glyph (hb_buffer_t *buffer,
+ hb_codepoint_t not_found)
+{
+ if (unlikely (hb_object_is_immutable (buffer)))
+ return;
+
+ buffer->not_found = not_found;
+}
+
+/**
+ * hb_buffer_get_not_found_glyph:
+ * @buffer: An #hb_buffer_t
+ *
+ * See hb_buffer_set_not_found_glyph().
+ *
+ * Return value:
+ * The @buffer not-found #hb_codepoint_t
+ *
+ * Since: 3.1.0
+ **/
+hb_codepoint_t
+hb_buffer_get_not_found_glyph (const hb_buffer_t *buffer)
+{
+ return buffer->not_found;
+}
+
+
+/**
+ * hb_buffer_clear_contents:
+ * @buffer: An #hb_buffer_t
+ *
+ * Similar to hb_buffer_reset(), but does not clear the Unicode functions and
+ * the replacement code point.
+ *
+ * Since: 0.9.11
+ **/
+void
+hb_buffer_clear_contents (hb_buffer_t *buffer)
+{
+ if (unlikely (hb_object_is_immutable (buffer)))
+ return;
+
+ buffer->clear ();
+}
+
+/**
+ * hb_buffer_pre_allocate:
+ * @buffer: An #hb_buffer_t
+ * @size: Number of items to pre allocate.
+ *
+ * Pre allocates memory for @buffer to fit at least @size number of items.
+ *
+ * Return value:
+ * `true` if @buffer memory allocation succeeded, `false` otherwise
+ *
+ * Since: 0.9.2
+ **/
+hb_bool_t
+hb_buffer_pre_allocate (hb_buffer_t *buffer, unsigned int size)
+{
+ return buffer->ensure (size);
+}
+
+/**
+ * hb_buffer_allocation_successful:
+ * @buffer: An #hb_buffer_t
+ *
+ * Check if allocating memory for the buffer succeeded.
+ *
+ * Return value:
+ * `true` if @buffer memory allocation succeeded, `false` otherwise.
+ *
+ * Since: 0.9.2
+ **/
+hb_bool_t
+hb_buffer_allocation_successful (hb_buffer_t *buffer)
+{
+ return buffer->successful;
+}
+
+/**
+ * hb_buffer_add:
+ * @buffer: An #hb_buffer_t
+ * @codepoint: A Unicode code point.
+ * @cluster: The cluster value of @codepoint.
+ *
+ * Appends a character with the Unicode value of @codepoint to @buffer, and
+ * gives it the initial cluster value of @cluster. Clusters can be any thing
+ * the client wants, they are usually used to refer to the index of the
+ * character in the input text stream and are output in
+ * #hb_glyph_info_t.cluster field.
+ *
+ * This function does not check the validity of @codepoint, it is up to the
+ * caller to ensure it is a valid Unicode code point.
+ *
+ * Since: 0.9.7
+ **/
+void
+hb_buffer_add (hb_buffer_t *buffer,
+ hb_codepoint_t codepoint,
+ unsigned int cluster)
+{
+ buffer->add (codepoint, cluster);
+ buffer->clear_context (1);
+}
+
+/**
+ * hb_buffer_set_length:
+ * @buffer: An #hb_buffer_t
+ * @length: The new length of @buffer
+ *
+ * Similar to hb_buffer_pre_allocate(), but clears any new items added at the
+ * end.
+ *
+ * Return value:
+ * `true` if @buffer memory allocation succeeded, `false` otherwise.
+ *
+ * Since: 0.9.2
+ **/
+hb_bool_t
+hb_buffer_set_length (hb_buffer_t *buffer,
+ unsigned int length)
+{
+ if (unlikely (hb_object_is_immutable (buffer)))
+ return length == 0;
+
+ if (unlikely (!buffer->ensure (length)))
+ return false;
+
+ /* Wipe the new space */
+ if (length > buffer->len) {
+ memset (buffer->info + buffer->len, 0, sizeof (buffer->info[0]) * (length - buffer->len));
+ if (buffer->have_positions)
+ memset (buffer->pos + buffer->len, 0, sizeof (buffer->pos[0]) * (length - buffer->len));
+ }
+
+ buffer->len = length;
+
+ if (!length)
+ {
+ buffer->content_type = HB_BUFFER_CONTENT_TYPE_INVALID;
+ buffer->clear_context (0);
+ }
+ buffer->clear_context (1);
+
+ return true;
+}
+
+/**
+ * hb_buffer_get_length:
+ * @buffer: An #hb_buffer_t
+ *
+ * Returns the number of items in the buffer.
+ *
+ * Return value:
+ * The @buffer length.
+ * The value valid as long as buffer has not been modified.
+ *
+ * Since: 0.9.2
+ **/
+unsigned int
+hb_buffer_get_length (const hb_buffer_t *buffer)
+{
+ return buffer->len;
+}
+
+/**
+ * hb_buffer_get_glyph_infos:
+ * @buffer: An #hb_buffer_t
+ * @length: (out): The output-array length.
+ *
+ * Returns @buffer glyph information array. Returned pointer
+ * is valid as long as @buffer contents are not modified.
+ *
+ * Return value: (transfer none) (array length=length):
+ * The @buffer glyph information array.
+ * The value valid as long as buffer has not been modified.
+ *
+ * Since: 0.9.2
+ **/
+hb_glyph_info_t *
+hb_buffer_get_glyph_infos (hb_buffer_t *buffer,
+ unsigned int *length)
+{
+ if (length)
+ *length = buffer->len;
+
+ return (hb_glyph_info_t *) buffer->info;
+}
+
+/**
+ * hb_buffer_get_glyph_positions:
+ * @buffer: An #hb_buffer_t
+ * @length: (out): The output length
+ *
+ * Returns @buffer glyph position array. Returned pointer
+ * is valid as long as @buffer contents are not modified.
+ *
+ * If buffer did not have positions before, the positions will be
+ * initialized to zeros, unless this function is called from
+ * within a buffer message callback (see hb_buffer_set_message_func()),
+ * in which case `NULL` is returned.
+ *
+ * Return value: (transfer none) (array length=length):
+ * The @buffer glyph position array.
+ * The value valid as long as buffer has not been modified.
+ *
+ * Since: 0.9.2
+ **/
+hb_glyph_position_t *
+hb_buffer_get_glyph_positions (hb_buffer_t *buffer,
+ unsigned int *length)
+{
+ if (length)
+ *length = buffer->len;
+
+ if (!buffer->have_positions)
+ {
+ if (unlikely (buffer->message_depth))
+ return nullptr;
+
+ buffer->clear_positions ();
+ }
+
+ return (hb_glyph_position_t *) buffer->pos;
+}
+
+/**
+ * hb_buffer_has_positions:
+ * @buffer: an #hb_buffer_t.
+ *
+ * Returns whether @buffer has glyph position data.
+ * A buffer gains position data when hb_buffer_get_glyph_positions() is called on it,
+ * and cleared of position data when hb_buffer_clear_contents() is called.
+ *
+ * Return value:
+ * `true` if the @buffer has position array, `false` otherwise.
+ *
+ * Since: 2.7.3
+ **/
+HB_EXTERN hb_bool_t
+hb_buffer_has_positions (hb_buffer_t *buffer)
+{
+ return buffer->have_positions;
+}
+
+/**
+ * hb_glyph_info_get_glyph_flags:
+ * @info: a #hb_glyph_info_t
+ *
+ * Returns glyph flags encoded within a #hb_glyph_info_t.
+ *
+ * Return value:
+ * The #hb_glyph_flags_t encoded within @info
+ *
+ * Since: 1.5.0
+ **/
+hb_glyph_flags_t
+(hb_glyph_info_get_glyph_flags) (const hb_glyph_info_t *info)
+{
+ return hb_glyph_info_get_glyph_flags (info);
+}
+
+/**
+ * hb_buffer_reverse:
+ * @buffer: An #hb_buffer_t
+ *
+ * Reverses buffer contents.
+ *
+ * Since: 0.9.2
+ **/
+void
+hb_buffer_reverse (hb_buffer_t *buffer)
+{
+ buffer->reverse ();
+}
+
+/**
+ * hb_buffer_reverse_range:
+ * @buffer: An #hb_buffer_t
+ * @start: start index
+ * @end: end index
+ *
+ * Reverses buffer contents between @start and @end.
+ *
+ * Since: 0.9.41
+ **/
+void
+hb_buffer_reverse_range (hb_buffer_t *buffer,
+ unsigned int start, unsigned int end)
+{
+ buffer->reverse_range (start, end);
+}
+
+/**
+ * hb_buffer_reverse_clusters:
+ * @buffer: An #hb_buffer_t
+ *
+ * Reverses buffer clusters. That is, the buffer contents are
+ * reversed, then each cluster (consecutive items having the
+ * same cluster number) are reversed again.
+ *
+ * Since: 0.9.2
+ **/
+void
+hb_buffer_reverse_clusters (hb_buffer_t *buffer)
+{
+ buffer->reverse_clusters ();
+}
+
+/**
+ * hb_buffer_guess_segment_properties:
+ * @buffer: An #hb_buffer_t
+ *
+ * Sets unset buffer segment properties based on buffer Unicode
+ * contents. If buffer is not empty, it must have content type
+ * #HB_BUFFER_CONTENT_TYPE_UNICODE.
+ *
+ * If buffer script is not set (ie. is #HB_SCRIPT_INVALID), it
+ * will be set to the Unicode script of the first character in
+ * the buffer that has a script other than #HB_SCRIPT_COMMON,
+ * #HB_SCRIPT_INHERITED, and #HB_SCRIPT_UNKNOWN.
+ *
+ * Next, if buffer direction is not set (ie. is #HB_DIRECTION_INVALID),
+ * it will be set to the natural horizontal direction of the
+ * buffer script as returned by hb_script_get_horizontal_direction().
+ * If hb_script_get_horizontal_direction() returns #HB_DIRECTION_INVALID,
+ * then #HB_DIRECTION_LTR is used.
+ *
+ * Finally, if buffer language is not set (ie. is #HB_LANGUAGE_INVALID),
+ * it will be set to the process's default language as returned by
+ * hb_language_get_default(). This may change in the future by
+ * taking buffer script into consideration when choosing a language.
+ * Note that hb_language_get_default() is NOT threadsafe the first time
+ * it is called. See documentation for that function for details.
+ *
+ * Since: 0.9.7
+ **/
+void
+hb_buffer_guess_segment_properties (hb_buffer_t *buffer)
+{
+ buffer->guess_segment_properties ();
+}
+
+template <typename utf_t>
+static inline void
+hb_buffer_add_utf (hb_buffer_t *buffer,
+ const typename utf_t::codepoint_t *text,
+ int text_length,
+ unsigned int item_offset,
+ int item_length)
+{
+ typedef typename utf_t::codepoint_t T;
+ const hb_codepoint_t replacement = buffer->replacement;
+
+ buffer->assert_unicode ();
+
+ if (unlikely (hb_object_is_immutable (buffer)))
+ return;
+
+ if (text_length == -1)
+ text_length = utf_t::strlen (text);
+
+ if (item_length == -1)
+ item_length = text_length - item_offset;
+
+ if (unlikely (item_length < 0 ||
+ item_length > INT_MAX / 8 ||
+ !buffer->ensure (buffer->len + item_length * sizeof (T) / 4)))
+ return;
+
+ /* If buffer is empty and pre-context provided, install it.
+ * This check is written this way, to make sure people can
+ * provide pre-context in one add_utf() call, then provide
+ * text in a follow-up call. See:
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=801410#c13
+ */
+ if (!buffer->len && item_offset > 0)
+ {
+ /* Add pre-context */
+ buffer->clear_context (0);
+ const T *prev = text + item_offset;
+ const T *start = text;
+ while (start < prev && buffer->context_len[0] < buffer->CONTEXT_LENGTH)
+ {
+ hb_codepoint_t u;
+ prev = utf_t::prev (prev, start, &u, replacement);
+ buffer->context[0][buffer->context_len[0]++] = u;
+ }
+ }
+
+ const T *next = text + item_offset;
+ const T *end = next + item_length;
+ while (next < end)
+ {
+ hb_codepoint_t u;
+ const T *old_next = next;
+ next = utf_t::next (next, end, &u, replacement);
+ buffer->add (u, old_next - (const T *) text);
+ }
+
+ /* Add post-context */
+ buffer->clear_context (1);
+ end = text + text_length;
+ while (next < end && buffer->context_len[1] < buffer->CONTEXT_LENGTH)
+ {
+ hb_codepoint_t u;
+ next = utf_t::next (next, end, &u, replacement);
+ buffer->context[1][buffer->context_len[1]++] = u;
+ }
+
+ buffer->content_type = HB_BUFFER_CONTENT_TYPE_UNICODE;
+}
+
+/**
+ * hb_buffer_add_utf8:
+ * @buffer: An #hb_buffer_t
+ * @text: (array length=text_length) (element-type uint8_t): An array of UTF-8
+ * characters to append.
+ * @text_length: The length of the @text, or -1 if it is `NULL` terminated.
+ * @item_offset: The offset of the first character to add to the @buffer.
+ * @item_length: The number of characters to add to the @buffer, or -1 for the
+ * end of @text (assuming it is `NULL` terminated).
+ *
+ * See hb_buffer_add_codepoints().
+ *
+ * Replaces invalid UTF-8 characters with the @buffer replacement code point,
+ * see hb_buffer_set_replacement_codepoint().
+ *
+ * Since: 0.9.2
+ **/
+void
+hb_buffer_add_utf8 (hb_buffer_t *buffer,
+ const char *text,
+ int text_length,
+ unsigned int item_offset,
+ int item_length)
+{
+ hb_buffer_add_utf<hb_utf8_t> (buffer, (const uint8_t *) text, text_length, item_offset, item_length);
+}
+
+/**
+ * hb_buffer_add_utf16:
+ * @buffer: An #hb_buffer_t
+ * @text: (array length=text_length): An array of UTF-16 characters to append
+ * @text_length: The length of the @text, or -1 if it is `NULL` terminated
+ * @item_offset: The offset of the first character to add to the @buffer
+ * @item_length: The number of characters to add to the @buffer, or -1 for the
+ * end of @text (assuming it is `NULL` terminated)
+ *
+ * See hb_buffer_add_codepoints().
+ *
+ * Replaces invalid UTF-16 characters with the @buffer replacement code point,
+ * see hb_buffer_set_replacement_codepoint().
+ *
+ * Since: 0.9.2
+ **/
+void
+hb_buffer_add_utf16 (hb_buffer_t *buffer,
+ const uint16_t *text,
+ int text_length,
+ unsigned int item_offset,
+ int item_length)
+{
+ hb_buffer_add_utf<hb_utf16_t> (buffer, text, text_length, item_offset, item_length);
+}
+
+/**
+ * hb_buffer_add_utf32:
+ * @buffer: An #hb_buffer_t
+ * @text: (array length=text_length): An array of UTF-32 characters to append
+ * @text_length: The length of the @text, or -1 if it is `NULL` terminated
+ * @item_offset: The offset of the first character to add to the @buffer
+ * @item_length: The number of characters to add to the @buffer, or -1 for the
+ * end of @text (assuming it is `NULL` terminated)
+ *
+ * See hb_buffer_add_codepoints().
+ *
+ * Replaces invalid UTF-32 characters with the @buffer replacement code point,
+ * see hb_buffer_set_replacement_codepoint().
+ *
+ * Since: 0.9.2
+ **/
+void
+hb_buffer_add_utf32 (hb_buffer_t *buffer,
+ const uint32_t *text,
+ int text_length,
+ unsigned int item_offset,
+ int item_length)
+{
+ hb_buffer_add_utf<hb_utf32_t> (buffer, text, text_length, item_offset, item_length);
+}
+
+/**
+ * hb_buffer_add_latin1:
+ * @buffer: An #hb_buffer_t
+ * @text: (array length=text_length) (element-type uint8_t): an array of UTF-8
+ * characters to append
+ * @text_length: the length of the @text, or -1 if it is `NULL` terminated
+ * @item_offset: the offset of the first character to add to the @buffer
+ * @item_length: the number of characters to add to the @buffer, or -1 for the
+ * end of @text (assuming it is `NULL` terminated)
+ *
+ * Similar to hb_buffer_add_codepoints(), but allows only access to first 256
+ * Unicode code points that can fit in 8-bit strings.
+ *
+ * <note>Has nothing to do with non-Unicode Latin-1 encoding.</note>
+ *
+ * Since: 0.9.39
+ **/
+void
+hb_buffer_add_latin1 (hb_buffer_t *buffer,
+ const uint8_t *text,
+ int text_length,
+ unsigned int item_offset,
+ int item_length)
+{
+ hb_buffer_add_utf<hb_latin1_t> (buffer, text, text_length, item_offset, item_length);
+}
+
+/**
+ * hb_buffer_add_codepoints:
+ * @buffer: a #hb_buffer_t to append characters to.
+ * @text: (array length=text_length): an array of Unicode code points to append.
+ * @text_length: the length of the @text, or -1 if it is `NULL` terminated.
+ * @item_offset: the offset of the first code point to add to the @buffer.
+ * @item_length: the number of code points to add to the @buffer, or -1 for the
+ * end of @text (assuming it is `NULL` terminated).
+ *
+ * Appends characters from @text array to @buffer. The @item_offset is the
+ * position of the first character from @text that will be appended, and
+ * @item_length is the number of character. When shaping part of a larger text
+ * (e.g. a run of text from a paragraph), instead of passing just the substring
+ * corresponding to the run, it is preferable to pass the whole
+ * paragraph and specify the run start and length as @item_offset and
+ * @item_length, respectively, to give HarfBuzz the full context to be able,
+ * for example, to do cross-run Arabic shaping or properly handle combining
+ * marks at stat of run.
+ *
+ * This function does not check the validity of @text, it is up to the caller
+ * to ensure it contains a valid Unicode code points.
+ *
+ * Since: 0.9.31
+ **/
+void
+hb_buffer_add_codepoints (hb_buffer_t *buffer,
+ const hb_codepoint_t *text,
+ int text_length,
+ unsigned int item_offset,
+ int item_length)
+{
+ hb_buffer_add_utf<hb_utf32_novalidate_t> (buffer, text, text_length, item_offset, item_length);
+}
+
+
+/**
+ * hb_buffer_append:
+ * @buffer: An #hb_buffer_t
+ * @source: source #hb_buffer_t
+ * @start: start index into source buffer to copy. Use 0 to copy from start of buffer.
+ * @end: end index into source buffer to copy. Use @HB_FEATURE_GLOBAL_END to copy to end of buffer.
+ *
+ * Append (part of) contents of another buffer to this buffer.
+ *
+ * Since: 1.5.0
+ **/
+HB_EXTERN void
+hb_buffer_append (hb_buffer_t *buffer,
+ const hb_buffer_t *source,
+ unsigned int start,
+ unsigned int end)
+{
+ assert (!buffer->have_output && !source->have_output);
+ assert (buffer->have_positions == source->have_positions ||
+ !buffer->len || !source->len);
+ assert (buffer->content_type == source->content_type ||
+ !buffer->len || !source->len);
+
+ if (end > source->len)
+ end = source->len;
+ if (start > end)
+ start = end;
+ if (start == end)
+ return;
+
+ if (buffer->len + (end - start) < buffer->len) /* Overflows. */
+ {
+ buffer->successful = false;
+ return;
+ }
+
+ unsigned int orig_len = buffer->len;
+ hb_buffer_set_length (buffer, buffer->len + (end - start));
+ if (unlikely (!buffer->successful))
+ return;
+
+ if (!orig_len)
+ buffer->content_type = source->content_type;
+ if (!buffer->have_positions && source->have_positions)
+ buffer->clear_positions ();
+
+ hb_segment_properties_overlay (&buffer->props, &source->props);
+
+ memcpy (buffer->info + orig_len, source->info + start, (end - start) * sizeof (buffer->info[0]));
+ if (buffer->have_positions)
+ memcpy (buffer->pos + orig_len, source->pos + start, (end - start) * sizeof (buffer->pos[0]));
+
+ if (source->content_type == HB_BUFFER_CONTENT_TYPE_UNICODE)
+ {
+ /* See similar logic in add_utf. */
+
+ /* pre-context */
+ if (!orig_len && start + source->context_len[0] > 0)
+ {
+ buffer->clear_context (0);
+ while (start > 0 && buffer->context_len[0] < buffer->CONTEXT_LENGTH)
+ buffer->context[0][buffer->context_len[0]++] = source->info[--start].codepoint;
+ for (auto i = 0u; i < source->context_len[0] && buffer->context_len[0] < buffer->CONTEXT_LENGTH; i++)
+ buffer->context[0][buffer->context_len[0]++] = source->context[0][i];
+ }
+
+ /* post-context */
+ buffer->clear_context (1);
+ while (end < source->len && buffer->context_len[1] < buffer->CONTEXT_LENGTH)
+ buffer->context[1][buffer->context_len[1]++] = source->info[end++].codepoint;
+ for (auto i = 0u; i < source->context_len[1] && buffer->context_len[1] < buffer->CONTEXT_LENGTH; i++)
+ buffer->context[1][buffer->context_len[1]++] = source->context[1][i];
+ }
+}
+
+
+static int
+compare_info_codepoint (const hb_glyph_info_t *pa,
+ const hb_glyph_info_t *pb)
+{
+ return (int) pb->codepoint - (int) pa->codepoint;
+}
+
+static inline void
+normalize_glyphs_cluster (hb_buffer_t *buffer,
+ unsigned int start,
+ unsigned int end,
+ bool backward)
+{
+ hb_glyph_position_t *pos = buffer->pos;
+
+ /* Total cluster advance */
+ hb_position_t total_x_advance = 0, total_y_advance = 0;
+ for (unsigned int i = start; i < end; i++)
+ {
+ total_x_advance += pos[i].x_advance;
+ total_y_advance += pos[i].y_advance;
+ }
+
+ hb_position_t x_advance = 0, y_advance = 0;
+ for (unsigned int i = start; i < end; i++)
+ {
+ pos[i].x_offset += x_advance;
+ pos[i].y_offset += y_advance;
+
+ x_advance += pos[i].x_advance;
+ y_advance += pos[i].y_advance;
+
+ pos[i].x_advance = 0;
+ pos[i].y_advance = 0;
+ }
+
+ if (backward)
+ {
+ /* Transfer all cluster advance to the last glyph. */
+ pos[end - 1].x_advance = total_x_advance;
+ pos[end - 1].y_advance = total_y_advance;
+
+ hb_stable_sort (buffer->info + start, end - start - 1, compare_info_codepoint, buffer->pos + start);
+ } else {
+ /* Transfer all cluster advance to the first glyph. */
+ pos[start].x_advance += total_x_advance;
+ pos[start].y_advance += total_y_advance;
+ for (unsigned int i = start + 1; i < end; i++) {
+ pos[i].x_offset -= total_x_advance;
+ pos[i].y_offset -= total_y_advance;
+ }
+ hb_stable_sort (buffer->info + start + 1, end - start - 1, compare_info_codepoint, buffer->pos + start + 1);
+ }
+}
+
+/**
+ * hb_buffer_normalize_glyphs:
+ * @buffer: An #hb_buffer_t
+ *
+ * Reorders a glyph buffer to have canonical in-cluster glyph order / position.
+ * The resulting clusters should behave identical to pre-reordering clusters.
+ *
+ * <note>This has nothing to do with Unicode normalization.</note>
+ *
+ * Since: 0.9.2
+ **/
+void
+hb_buffer_normalize_glyphs (hb_buffer_t *buffer)
+{
+ assert (buffer->have_positions);
+
+ buffer->assert_glyphs ();
+
+ bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
+
+ foreach_cluster (buffer, start, end)
+ normalize_glyphs_cluster (buffer, start, end, backward);
+}
+
+void
+hb_buffer_t::sort (unsigned int start, unsigned int end, int(*compar)(const hb_glyph_info_t *, const hb_glyph_info_t *))
+{
+ assert (!have_positions);
+ for (unsigned int i = start + 1; i < end; i++)
+ {
+ unsigned int j = i;
+ while (j > start && compar (&info[j - 1], &info[i]) > 0)
+ j--;
+ if (i == j)
+ continue;
+ /* Move item i to occupy place for item j, shift what's in between. */
+ merge_clusters (j, i + 1);
+ {
+ hb_glyph_info_t t = info[i];
+ memmove (&info[j + 1], &info[j], (i - j) * sizeof (hb_glyph_info_t));
+ info[j] = t;
+ }
+ }
+}
+
+
+/*
+ * Comparing buffers.
+ */
+
+/**
+ * hb_buffer_diff:
+ * @buffer: a buffer.
+ * @reference: other buffer to compare to.
+ * @dottedcircle_glyph: glyph id of U+25CC DOTTED CIRCLE, or (hb_codepont_t) -1.
+ * @position_fuzz: allowed absolute difference in position values.
+ *
+ * If dottedcircle_glyph is (hb_codepoint_t) -1 then #HB_BUFFER_DIFF_FLAG_DOTTED_CIRCLE_PRESENT
+ * and #HB_BUFFER_DIFF_FLAG_NOTDEF_PRESENT are never returned. This should be used by most
+ * callers if just comparing two buffers is needed.
+ *
+ * Since: 1.5.0
+ **/
+hb_buffer_diff_flags_t
+hb_buffer_diff (hb_buffer_t *buffer,
+ hb_buffer_t *reference,
+ hb_codepoint_t dottedcircle_glyph,
+ unsigned int position_fuzz)
+{
+ if (buffer->content_type != reference->content_type && buffer->len && reference->len)
+ return HB_BUFFER_DIFF_FLAG_CONTENT_TYPE_MISMATCH;
+
+ hb_buffer_diff_flags_t result = HB_BUFFER_DIFF_FLAG_EQUAL;
+ bool contains = dottedcircle_glyph != (hb_codepoint_t) -1;
+
+ unsigned int count = reference->len;
+
+ if (buffer->len != count)
+ {
+ /*
+ * we can't compare glyph-by-glyph, but we do want to know if there
+ * are .notdef or dottedcircle glyphs present in the reference buffer
+ */
+ const hb_glyph_info_t *info = reference->info;
+ unsigned int i;
+ for (i = 0; i < count; i++)
+ {
+ if (contains && info[i].codepoint == dottedcircle_glyph)
+ result |= HB_BUFFER_DIFF_FLAG_DOTTED_CIRCLE_PRESENT;
+ if (contains && info[i].codepoint == 0)
+ result |= HB_BUFFER_DIFF_FLAG_NOTDEF_PRESENT;
+ }
+ result |= HB_BUFFER_DIFF_FLAG_LENGTH_MISMATCH;
+ return hb_buffer_diff_flags_t (result);
+ }
+
+ if (!count)
+ return hb_buffer_diff_flags_t (result);
+
+ const hb_glyph_info_t *buf_info = buffer->info;
+ const hb_glyph_info_t *ref_info = reference->info;
+ for (unsigned int i = 0; i < count; i++)
+ {
+ if (buf_info->codepoint != ref_info->codepoint)
+ result |= HB_BUFFER_DIFF_FLAG_CODEPOINT_MISMATCH;
+ if (buf_info->cluster != ref_info->cluster)
+ result |= HB_BUFFER_DIFF_FLAG_CLUSTER_MISMATCH;
+ if ((buf_info->mask & ~ref_info->mask & HB_GLYPH_FLAG_DEFINED))
+ result |= HB_BUFFER_DIFF_FLAG_GLYPH_FLAGS_MISMATCH;
+ if (contains && ref_info->codepoint == dottedcircle_glyph)
+ result |= HB_BUFFER_DIFF_FLAG_DOTTED_CIRCLE_PRESENT;
+ if (contains && ref_info->codepoint == 0)
+ result |= HB_BUFFER_DIFF_FLAG_NOTDEF_PRESENT;
+ buf_info++;
+ ref_info++;
+ }
+
+ if (buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS)
+ {
+ assert (buffer->have_positions);
+ const hb_glyph_position_t *buf_pos = buffer->pos;
+ const hb_glyph_position_t *ref_pos = reference->pos;
+ for (unsigned int i = 0; i < count; i++)
+ {
+ if ((unsigned int) abs (buf_pos->x_advance - ref_pos->x_advance) > position_fuzz ||
+ (unsigned int) abs (buf_pos->y_advance - ref_pos->y_advance) > position_fuzz ||
+ (unsigned int) abs (buf_pos->x_offset - ref_pos->x_offset) > position_fuzz ||
+ (unsigned int) abs (buf_pos->y_offset - ref_pos->y_offset) > position_fuzz)
+ {
+ result |= HB_BUFFER_DIFF_FLAG_POSITION_MISMATCH;
+ break;
+ }
+ buf_pos++;
+ ref_pos++;
+ }
+ }
+
+ return result;
+}
+
+
+/*
+ * Debugging.
+ */
+
+#ifndef HB_NO_BUFFER_MESSAGE
+/**
+ * hb_buffer_set_message_func:
+ * @buffer: An #hb_buffer_t
+ * @func: (closure user_data) (destroy destroy) (scope notified): Callback function
+ * @user_data: (nullable): Data to pass to @func
+ * @destroy: (nullable): The function to call when @user_data is not needed anymore
+ *
+ * Sets the implementation function for #hb_buffer_message_func_t.
+ *
+ * Since: 1.1.3
+ **/
+void
+hb_buffer_set_message_func (hb_buffer_t *buffer,
+ hb_buffer_message_func_t func,
+ void *user_data, hb_destroy_func_t destroy)
+{
+ if (buffer->message_destroy)
+ buffer->message_destroy (buffer->message_data);
+
+ if (func) {
+ buffer->message_func = func;
+ buffer->message_data = user_data;
+ buffer->message_destroy = destroy;
+ } else {
+ buffer->message_func = nullptr;
+ buffer->message_data = nullptr;
+ buffer->message_destroy = nullptr;
+ }
+}
+bool
+hb_buffer_t::message_impl (hb_font_t *font, const char *fmt, va_list ap)
+{
+ assert (!have_output || (out_info == info && out_len == idx));
+
+ message_depth++;
+
+ char buf[100];
+ vsnprintf (buf, sizeof (buf), fmt, ap);
+ bool ret = (bool) this->message_func (this, font, buf, this->message_data);
+
+ message_depth--;
+
+ return ret;
+}
+#endif