The Tor Browser: gfx/harfbuzz/src/hb-buffer.cc@6474c204b198 (annotated)

gfx/harfbuzz/src/hb-buffer.cc@6474c204b198 (annotated)

gfx/harfbuzz/src/hb-buffer.cc

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*
  * 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-private.hh"
 #include "hb-utf-private.hh"
 #ifndef HB_DEBUG_BUFFER
 #define HB_DEBUG_BUFFER (HB_DEBUG+0)
 #endif
 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;
 }
 unsigned int
 hb_segment_properties_hash (const hb_segment_properties_t *p)
 {
   return (unsigned int) p->direction ^
 	 (unsigned int) p->script ^
 	 (intptr_t) (p->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, swap_buffers() is 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.  swap_buffers() then
  * switches info and out_info.
  */
 /* Internal API */
 bool
 hb_buffer_t::enlarge (unsigned int size)
 {
   if (unlikely (in_error))
     return false;
   unsigned int new_allocated = allocated;
   hb_glyph_position_t *new_pos = NULL;
   hb_glyph_info_t *new_info = NULL;
   bool separate_out = out_info != info;
   if (unlikely (_hb_unsigned_int_mul_overflows (size, sizeof (info[0]))))
     goto done;
   while (size >= new_allocated)
     new_allocated += (new_allocated >> 1) + 32;
   ASSERT_STATIC (sizeof (info[0]) == sizeof (pos[0]));
   if (unlikely (_hb_unsigned_int_mul_overflows (new_allocated, sizeof (info[0]))))
     goto done;
   new_pos = (hb_glyph_position_t *) realloc (pos, new_allocated * sizeof (pos[0]));
   new_info = (hb_glyph_info_t *) realloc (info, new_allocated * sizeof (info[0]));
 done:
   if (unlikely (!new_pos || !new_info))
     in_error = true;
   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 (!in_error))
     allocated = new_allocated;
   return likely (!in_error);
 }
 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]));
   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::reset (void)
 {
   if (unlikely (hb_object_is_inert (this)))
     return;
   hb_unicode_funcs_destroy (unicode);
   unicode = hb_unicode_funcs_get_default ();
   clear ();
 }
 void
 hb_buffer_t::clear (void)
 {
   if (unlikely (hb_object_is_inert (this)))
     return;
   hb_segment_properties_t default_props = HB_SEGMENT_PROPERTIES_DEFAULT;
   props = default_props;
   flags = HB_BUFFER_FLAG_DEFAULT;
   content_type = HB_BUFFER_CONTENT_TYPE_INVALID;
   in_error = false;
   have_output = false;
   have_positions = false;
   idx = 0;
   len = 0;
   out_len = 0;
   out_info = info;
   serial = 0;
   memset (allocated_var_bytes, 0, sizeof allocated_var_bytes);
   memset (allocated_var_owner, 0, sizeof allocated_var_owner);
   memset (context, 0, sizeof context);
   memset (context_len, 0, sizeof context_len);
 }
 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 = 1;
   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::remove_output (void)
 {
   if (unlikely (hb_object_is_inert (this)))
     return;
   have_output = false;
   have_positions = false;
   out_len = 0;
   out_info = info;
 }
 void
 hb_buffer_t::clear_output (void)
 {
   if (unlikely (hb_object_is_inert (this)))
     return;
   have_output = true;
   have_positions = false;
   out_len = 0;
   out_info = info;
 }
 void
 hb_buffer_t::clear_positions (void)
 {
   if (unlikely (hb_object_is_inert (this)))
     return;
   have_output = false;
   have_positions = true;
   out_len = 0;
   out_info = info;
   memset (pos, 0, sizeof (pos[0]) * len);
 }
 void
 hb_buffer_t::swap_buffers (void)
 {
   if (unlikely (in_error)) return;
   assert (have_output);
   have_output = false;
   if (out_info != info)
   {
     hb_glyph_info_t *tmp_string;
     tmp_string = info;
     info = out_info;
     out_info = tmp_string;
     pos = (hb_glyph_position_t *) out_info;
   }
   unsigned int tmp;
   tmp = len;
   len = out_len;
   out_len = tmp;
   idx = 0;
 }
 void
 hb_buffer_t::replace_glyphs (unsigned int num_in,
 			     unsigned int num_out,
 			     const uint32_t *glyph_data)
 {
   if (unlikely (!make_room_for (num_in, num_out))) return;
   merge_clusters (idx, idx + num_in);
   hb_glyph_info_t orig_info = info[idx];
   hb_glyph_info_t *pinfo = &out_info[out_len];
   for (unsigned int i = 0; i < num_out; i++)
   {
     *pinfo = orig_info;
     pinfo->codepoint = glyph_data[i];
     pinfo++;
   }
   idx  += num_in;
   out_len += num_out;
 }
 void
 hb_buffer_t::output_glyph (hb_codepoint_t glyph_index)
 {
   if (unlikely (!make_room_for (0, 1))) return;
   out_info[out_len] = info[idx];
   out_info[out_len].codepoint = glyph_index;
   out_len++;
 }
 void
 hb_buffer_t::output_info (const hb_glyph_info_t &glyph_info)
 {
   if (unlikely (!make_room_for (0, 1))) return;
   out_info[out_len] = glyph_info;
   out_len++;
 }
 void
 hb_buffer_t::copy_glyph (void)
 {
   if (unlikely (!make_room_for (0, 1))) return;
   out_info[out_len] = info[idx];
   out_len++;
 }
 bool
 hb_buffer_t::move_to (unsigned int i)
 {
   if (!have_output)
   {
     assert (i <= len);
     idx = i;
     return true;
   }
   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;
     if (unlikely (idx < count && !shift_forward (count + 32))) 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::replace_glyph (hb_codepoint_t glyph_index)
 {
   if (unlikely (out_info != info || out_len != idx)) {
     if (unlikely (!make_room_for (1, 1))) return;
     out_info[out_len] = info[idx];
   }
   out_info[out_len].codepoint = glyph_index;
   idx++;
   out_len++;
 }
 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;
   if (cluster_start == 0 && cluster_end == (unsigned int)-1) {
     unsigned int count = len;
     for (unsigned int i = 0; i < count; i++)
       info[i].mask = (info[i].mask & not_mask) | value;
     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::reverse_range (unsigned int start,
 			    unsigned int end)
 {
   unsigned int i, j;
   if (start == end - 1)
     return;
   for (i = start, j = end - 1; i < j; i++, j--) {
     hb_glyph_info_t t;
     t = info[i];
     info[i] = info[j];
     info[j] = t;
   }
   if (pos) {
     for (i = start, j = end - 1; i < j; i++, j--) {
       hb_glyph_position_t t;
       t = pos[i];
       pos[i] = pos[j];
       pos[j] = t;
     }
   }
 }
 void
 hb_buffer_t::reverse (void)
 {
   if (unlikely (!len))
     return;
   reverse_range (0, len);
 }
 void
 hb_buffer_t::reverse_clusters (void)
 {
   unsigned int i, start, count, last_cluster;
   if (unlikely (!len))
     return;
   reverse ();
   count = len;
   start = 0;
   last_cluster = info[0].cluster;
   for (i = 1; i < count; i++) {
     if (last_cluster != info[i].cluster) {
       reverse_range (start, i);
       start = i;
       last_cluster = info[i].cluster;
     }
   }
   reverse_range (start, i);
 }
 void
 hb_buffer_t::merge_clusters (unsigned int start,
 			     unsigned int end)
 {
   if (unlikely (end - start < 2))
     return;
   unsigned int cluster = info[start].cluster;
   for (unsigned int i = start + 1; i < end; i++)
     cluster = 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 i = out_len; i && out_info[i - 1].cluster == info[start].cluster; i--)
       out_info[i - 1].cluster = cluster;
   for (unsigned int i = start; i < end; i++)
     info[i].cluster = cluster;
 }
 void
 hb_buffer_t::merge_out_clusters (unsigned int start,
 				 unsigned int end)
 {
   if (unlikely (end - start < 2))
     return;
   unsigned int cluster = out_info[start].cluster;
   for (unsigned int i = start + 1; i < end; i++)
     cluster = 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 i = idx; i < len && info[i].cluster == out_info[end - 1].cluster; i++)
       info[i].cluster = cluster;
   for (unsigned int i = start; i < end; i++)
     out_info[i].cluster = cluster;
 }
 void
 hb_buffer_t::guess_segment_properties (void)
 {
   assert (content_type == HB_BUFFER_CONTENT_TYPE_UNICODE ||
 	  (!len && content_type == HB_BUFFER_CONTENT_TYPE_INVALID));
   /* 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 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 ();
   }
 }
 static inline void
 dump_var_allocation (const hb_buffer_t *buffer)
 {
   char buf[80];
   for (unsigned int i = 0; i < 8; i++)
     buf[i] = '0' + buffer->allocated_var_bytes[7 - i];
   buf[8] = '\0';
   DEBUG_MSG (BUFFER, buffer,
 	     "Current var allocation: %s",
 	     buf);
 }
 void hb_buffer_t::allocate_var (unsigned int byte_i, unsigned int count, const char *owner)
 {
   assert (byte_i < 8 && byte_i + count <= 8);
   if (DEBUG_ENABLED (BUFFER))
     dump_var_allocation (this);
   DEBUG_MSG (BUFFER, this,
 	     "Allocating var bytes %d..%d for %s",
 	     byte_i, byte_i + count - 1, owner);
   for (unsigned int i = byte_i; i < byte_i + count; i++) {
     assert (!allocated_var_bytes[i]);
     allocated_var_bytes[i]++;
     allocated_var_owner[i] = owner;
   }
 }
 void hb_buffer_t::deallocate_var (unsigned int byte_i, unsigned int count, const char *owner)
 {
   if (DEBUG_ENABLED (BUFFER))
     dump_var_allocation (this);
   DEBUG_MSG (BUFFER, this,
 	     "Deallocating var bytes %d..%d for %s",
 	     byte_i, byte_i + count - 1, owner);
   assert (byte_i < 8 && byte_i + count <= 8);
   for (unsigned int i = byte_i; i < byte_i + count; i++) {
     assert (allocated_var_bytes[i]);
     assert (0 == strcmp (allocated_var_owner[i], owner));
     allocated_var_bytes[i]--;
   }
 }
 void hb_buffer_t::assert_var (unsigned int byte_i, unsigned int count, const char *owner)
 {
   if (DEBUG_ENABLED (BUFFER))
     dump_var_allocation (this);
   DEBUG_MSG (BUFFER, this,
 	     "Asserting var bytes %d..%d for %s",
 	     byte_i, byte_i + count - 1, owner);
   assert (byte_i < 8 && byte_i + count <= 8);
   for (unsigned int i = byte_i; i < byte_i + count; i++) {
     assert (allocated_var_bytes[i]);
     assert (0 == strcmp (allocated_var_owner[i], owner));
   }
 }
 void hb_buffer_t::deallocate_var_all (void)
 {
   memset (allocated_var_bytes, 0, sizeof (allocated_var_bytes));
   memset (allocated_var_owner, 0, sizeof (allocated_var_owner));
 }
 /* Public API */
 /**
  * hb_buffer_create: (Xconstructor)
  *
  *
  *
  * Return value: (transfer full)
  *
  * Since: 1.0
  **/
 hb_buffer_t *
 hb_buffer_create (void)
 {
   hb_buffer_t *buffer;
   if (!(buffer = hb_object_create<hb_buffer_t> ()))
     return hb_buffer_get_empty ();
   buffer->reset ();
   return buffer;
 }
 /**
  * hb_buffer_get_empty:
  *
  *
  *
  * Return value: (transfer full):
  *
  * Since: 1.0
  **/
 hb_buffer_t *
 hb_buffer_get_empty (void)
 {
   static const hb_buffer_t _hb_buffer_nil = {
     HB_OBJECT_HEADER_STATIC,
     const_cast<hb_unicode_funcs_t *> (&_hb_unicode_funcs_nil),
     HB_SEGMENT_PROPERTIES_DEFAULT,
     HB_BUFFER_FLAG_DEFAULT,
     HB_BUFFER_CONTENT_TYPE_INVALID,
     true, /* in_error */
     true, /* have_output */
     true  /* have_positions */
     /* Zero is good enough for everything else. */
   };
   return const_cast<hb_buffer_t *> (&_hb_buffer_nil);
 }
 /**
  * hb_buffer_reference: (skip)
  * @buffer: a buffer.
  *
  *
  *
  * Return value: (transfer full):
  *
  * Since: 1.0
  **/
 hb_buffer_t *
 hb_buffer_reference (hb_buffer_t *buffer)
 {
   return hb_object_reference (buffer);
 }
 /**
  * hb_buffer_destroy: (skip)
  * @buffer: a buffer.
  *
  *
  *
  * Since: 1.0
  **/
 void
 hb_buffer_destroy (hb_buffer_t *buffer)
 {
   if (!hb_object_destroy (buffer)) return;
   hb_unicode_funcs_destroy (buffer->unicode);
   free (buffer->info);
   free (buffer->pos);
   free (buffer);
 }
 /**
  * hb_buffer_set_user_data: (skip)
  * @buffer: a buffer.
  * @key:
  * @data:
  * @destroy:
  * @replace:
  *
  *
  *
  * Return value:
  *
  * Since: 1.0
  **/
 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: a buffer.
  * @key:
  *
  *
  *
  * Return value:
  *
  * Since: 1.0
  **/
 void *
 hb_buffer_get_user_data (hb_buffer_t        *buffer,
 			 hb_user_data_key_t *key)
 {
   return hb_object_get_user_data (buffer, key);
 }
 /**
  * hb_buffer_set_content_type:
  * @buffer: a buffer.
  * @content_type:
  *
  *
  *
  * Since: 1.0
  **/
 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: a buffer.
  *
  *
  *
  * Return value:
  *
  * Since: 1.0
  **/
 hb_buffer_content_type_t
 hb_buffer_get_content_type (hb_buffer_t *buffer)
 {
   return buffer->content_type;
 }
 /**
  * hb_buffer_set_unicode_funcs:
  * @buffer: a buffer.
  * @unicode_funcs:
  *
  *
  *
  * Since: 1.0
  **/
 void
 hb_buffer_set_unicode_funcs (hb_buffer_t        *buffer,
 			     hb_unicode_funcs_t *unicode_funcs)
 {
   if (unlikely (hb_object_is_inert (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: a buffer.
  *
  *
  *
  * Return value:
  *
  * Since: 1.0
  **/
 hb_unicode_funcs_t *
 hb_buffer_get_unicode_funcs (hb_buffer_t        *buffer)
 {
   return buffer->unicode;
 }
 /**
  * hb_buffer_set_direction:
  * @buffer: a buffer.
  * @direction:
  *
  *
  *
  * Since: 1.0
  **/
 void
 hb_buffer_set_direction (hb_buffer_t    *buffer,
 			 hb_direction_t  direction)
 {
   if (unlikely (hb_object_is_inert (buffer)))
     return;
   buffer->props.direction = direction;
 }
 /**
  * hb_buffer_get_direction:
  * @buffer: a buffer.
  *
  *
  *
  * Return value:
  *
  * Since: 1.0
  **/
 hb_direction_t
 hb_buffer_get_direction (hb_buffer_t    *buffer)
 {
   return buffer->props.direction;
 }
 /**
  * hb_buffer_set_script:
  * @buffer: a buffer.
  * @script:
  *
  *
  *
  * Since: 1.0
  **/
 void
 hb_buffer_set_script (hb_buffer_t *buffer,
 		      hb_script_t  script)
 {
   if (unlikely (hb_object_is_inert (buffer)))
     return;
   buffer->props.script = script;
 }
 /**
  * hb_buffer_get_script:
  * @buffer: a buffer.
  *
  *
  *
  * Return value:
  *
  * Since: 1.0
  **/
 hb_script_t
 hb_buffer_get_script (hb_buffer_t *buffer)
 {
   return buffer->props.script;
 }
 /**
  * hb_buffer_set_language:
  * @buffer: a buffer.
  * @language:
  *
  *
  *
  * Since: 1.0
  **/
 void
 hb_buffer_set_language (hb_buffer_t   *buffer,
 			hb_language_t  language)
 {
   if (unlikely (hb_object_is_inert (buffer)))
     return;
   buffer->props.language = language;
 }
 /**
  * hb_buffer_get_language:
  * @buffer: a buffer.
  *
  *
  *
  * Return value:
  *
  * Since: 1.0
  **/
 hb_language_t
 hb_buffer_get_language (hb_buffer_t *buffer)
 {
   return buffer->props.language;
 }
 /**
  * hb_buffer_set_segment_properties:
  * @buffer: a buffer.
  * @props:
  *
  *
  *
  * Since: 1.0
  **/
 void
 hb_buffer_set_segment_properties (hb_buffer_t *buffer,
 				  const hb_segment_properties_t *props)
 {
   if (unlikely (hb_object_is_inert (buffer)))
     return;
   buffer->props = *props;
 }
 /**
  * hb_buffer_get_segment_properties:
  * @buffer: a buffer.
  * @props:
  *
  *
  *
  * Since: 1.0
  **/
 void
 hb_buffer_get_segment_properties (hb_buffer_t *buffer,
 				  hb_segment_properties_t *props)
 {
   *props = buffer->props;
 }
 /**
  * hb_buffer_set_flags:
  * @buffer: a buffer.
  * @flags:
  *
  *
  *
  * Since: 1.0
  **/
 void
 hb_buffer_set_flags (hb_buffer_t       *buffer,
 		     hb_buffer_flags_t  flags)
 {
   if (unlikely (hb_object_is_inert (buffer)))
     return;
   buffer->flags = flags;
 }
 /**
  * hb_buffer_get_flags:
  * @buffer: a buffer.
  *
  *
  *
  * Return value:
  *
  * Since: 1.0
  **/
 hb_buffer_flags_t
 hb_buffer_get_flags (hb_buffer_t *buffer)
 {
   return buffer->flags;
 }
 /**
  * hb_buffer_reset:
  * @buffer: a buffer.
  *
  *
  *
  * Since: 1.0
  **/
 void
 hb_buffer_reset (hb_buffer_t *buffer)
 {
   buffer->reset ();
 }
 /**
  * hb_buffer_clear_contents:
  * @buffer: a buffer.
  *
  *
  *
  * Since: 1.0
  **/
 void
 hb_buffer_clear_contents (hb_buffer_t *buffer)
 {
   buffer->clear ();
 }
 /**
  * hb_buffer_pre_allocate:
  * @buffer: a buffer.
  * @size:
  *
  *
  *
  * Return value:
  *
  * Since: 1.0
  **/
 hb_bool_t
 hb_buffer_pre_allocate (hb_buffer_t *buffer, unsigned int size)
 {
   return buffer->ensure (size);
 }
 /**
  * hb_buffer_allocation_successful:
  * @buffer: a buffer.
  *
  *
  *
  * Return value:
  *
  * Since: 1.0
  **/
 hb_bool_t
 hb_buffer_allocation_successful (hb_buffer_t  *buffer)
 {
   return !buffer->in_error;
 }
 /**
  * hb_buffer_add:
  * @buffer: a buffer.
  * @codepoint:
  * @cluster:
  *
  *
  *
  * Since: 1.0
  **/
 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: a buffer.
  * @length:
  *
  *
  *
  * Return value:
  *
  * Since: 1.0
  **/
 hb_bool_t
 hb_buffer_set_length (hb_buffer_t  *buffer,
 		      unsigned int  length)
 {
   if (unlikely (hb_object_is_inert (buffer)))
     return length == 0;
   if (!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: a buffer.
  *
  * Returns the number of items in the buffer.
  *
  * Return value: buffer length.
  *
  * Since: 1.0
  **/
 unsigned int
 hb_buffer_get_length (hb_buffer_t *buffer)
 {
   return buffer->len;
 }
 /**
  * hb_buffer_get_glyph_infos:
  * @buffer: a buffer.
  * @length: (out): 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): buffer glyph information array.
  *
  * Since: 1.0
  **/
 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: a buffer.
  * @length: (out): output length.
  *
  * Returns buffer glyph position array.  Returned pointer
  * is valid as long as buffer contents are not modified.
  *
  * Return value: (transfer none) (array length=length): buffer glyph position array.
  *
  * Since: 1.0
  **/
 hb_glyph_position_t *
 hb_buffer_get_glyph_positions (hb_buffer_t  *buffer,
                                unsigned int *length)
 {
   if (!buffer->have_positions)
     buffer->clear_positions ();
   if (length)
     *length = buffer->len;
   return (hb_glyph_position_t *) buffer->pos;
 }
 /**
  * hb_buffer_reverse:
  * @buffer: a buffer.
  *
  * Reverses buffer contents.
  *
  * Since: 1.0
  **/
 void
 hb_buffer_reverse (hb_buffer_t *buffer)
 {
   buffer->reverse ();
 }
 /**
  * hb_buffer_reverse_clusters:
  * @buffer: a buffer.
  *
  * Reverses buffer clusters.  That is, the buffer contents are
  * reversed, then each cluster (consecutive items having the
  * same cluster number) are reversed again.
  *
  * Since: 1.0
  **/
 void
 hb_buffer_reverse_clusters (hb_buffer_t *buffer)
 {
   buffer->reverse_clusters ();
 }
 /**
  * hb_buffer_guess_segment_properties:
  * @buffer: a buffer.
  *
  * 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().
  *
  * 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.
  *
  * Since: 1.0
  **/
 void
 hb_buffer_guess_segment_properties (hb_buffer_t *buffer)
 {
   buffer->guess_segment_properties ();
 }
 template <typename T>
 static inline void
 hb_buffer_add_utf (hb_buffer_t  *buffer,
 		   const T      *text,
 		   int           text_length,
 		   unsigned int  item_offset,
 		   int           item_length)
 {
   assert (buffer->content_type == HB_BUFFER_CONTENT_TYPE_UNICODE ||
 	  (!buffer->len && buffer->content_type == HB_BUFFER_CONTENT_TYPE_INVALID));
   if (unlikely (hb_object_is_inert (buffer)))
     return;
   if (text_length == -1)
     text_length = hb_utf_strlen (text);
   if (item_length == -1)
     item_length = text_length - item_offset;
   buffer->ensure (buffer->len + item_length * sizeof (T) / 4);
   /* 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 = hb_utf_prev (prev, start, &u);
       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 = hb_utf_next (next, end, &u);
     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 = hb_utf_next (next, end, &u);
     buffer->context[1][buffer->context_len[1]++] = u;
   }
   buffer->content_type = HB_BUFFER_CONTENT_TYPE_UNICODE;
 }
 /**
  * hb_buffer_add_utf8:
  * @buffer: a buffer.
  * @text: (array length=text_length):
  * @text_length:
  * @item_offset:
  * @item_length:
  *
  *
  *
  * Since: 1.0
  **/
 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 (buffer, (const uint8_t *) text, text_length, item_offset, item_length);
 }
 /**
  * hb_buffer_add_utf16:
  * @buffer: a buffer.
  * @text: (array length=text_length):
  * @text_length:
  * @item_offset:
  * @item_length:
  *
  *
  *
  * Since: 1.0
  **/
 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 (buffer, text, text_length, item_offset, item_length);
 }
 /**
  * hb_buffer_add_utf32:
  * @buffer: a buffer.
  * @text: (array length=text_length):
  * @text_length:
  * @item_offset:
  * @item_length:
  *
  *
  *
  * Since: 1.0
  **/
 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 (buffer, text, text_length, item_offset, item_length);
 }
 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_bubble_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_bubble_sort (buffer->info + start + 1, end - start - 1, compare_info_codepoint, buffer->pos + start + 1);
   }
 }
 /**
  * hb_buffer_normalize_glyphs:
  * @buffer: a buffer.
  *
  *
  *
  * Since: 1.0
  **/
 void
 hb_buffer_normalize_glyphs (hb_buffer_t *buffer)
 {
   assert (buffer->have_positions);
   assert (buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS);
   bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
   unsigned int count = buffer->len;
   if (unlikely (!count)) return;
   hb_glyph_info_t *info = buffer->info;
   unsigned int start = 0;
   unsigned int end;
   for (end = start + 1; end < count; end++)
     if (info[start].cluster != info[end].cluster) {
       normalize_glyphs_cluster (buffer, start, end, backward);
       start = end;
     }
   normalize_glyphs_cluster (buffer, start, end, backward);
 }

The Tor Browser / annotate

gfx/harfbuzz/src/hb-buffer.cc@6474c204b198 (annotated)

gfx/harfbuzz/src/hb-buffer.cc