6c15ddfe2b
Some infrastructures use DEBUG as a generic symbol.
1078 lines
24 KiB
C++
1078 lines
24 KiB
C++
/*
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* Copyright © 1998-2004 David Turner and Werner Lemberg
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* Copyright © 2004,2007,2009,2010 Red Hat, Inc.
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* Copyright © 2011,2012 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Owen Taylor, Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#include "hb-buffer-private.hh"
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#include "hb-utf-private.hh"
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#ifndef HB_DEBUG_BUFFER
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#define HB_DEBUG_BUFFER (HB_DEBUG+0)
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#endif
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hb_bool_t
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hb_segment_properties_equal (const hb_segment_properties_t *a,
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const hb_segment_properties_t *b)
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{
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return a->direction == b->direction &&
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a->script == b->script &&
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a->language == b->language &&
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a->reserved1 == b->reserved1 &&
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a->reserved2 == b->reserved2;
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}
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unsigned int
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hb_segment_properties_hash (const hb_segment_properties_t *p)
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{
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return (unsigned int) p->direction ^
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(unsigned int) p->script ^
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(intptr_t) (p->language);
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}
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/* Here is how the buffer works internally:
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*
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* There are two info pointers: info and out_info. They always have
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* the same allocated size, but different lengths.
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*
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* As an optimization, both info and out_info may point to the
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* same piece of memory, which is owned by info. This remains the
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* case as long as out_len doesn't exceed i at any time.
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* In that case, swap_buffers() is no-op and the glyph operations operate
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* mostly in-place.
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*
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* As soon as out_info gets longer than info, out_info is moved over
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* to an alternate buffer (which we reuse the pos buffer for!), and its
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* current contents (out_len entries) are copied to the new place.
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* This should all remain transparent to the user. swap_buffers() then
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* switches info and out_info.
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*/
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/* Internal API */
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bool
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hb_buffer_t::enlarge (unsigned int size)
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{
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if (unlikely (in_error))
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return false;
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unsigned int new_allocated = allocated;
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hb_glyph_position_t *new_pos = NULL;
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hb_glyph_info_t *new_info = NULL;
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bool separate_out = out_info != info;
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if (unlikely (_hb_unsigned_int_mul_overflows (size, sizeof (info[0]))))
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goto done;
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while (size >= new_allocated)
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new_allocated += (new_allocated >> 1) + 32;
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ASSERT_STATIC (sizeof (info[0]) == sizeof (pos[0]));
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if (unlikely (_hb_unsigned_int_mul_overflows (new_allocated, sizeof (info[0]))))
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goto done;
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new_pos = (hb_glyph_position_t *) realloc (pos, new_allocated * sizeof (pos[0]));
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new_info = (hb_glyph_info_t *) realloc (info, new_allocated * sizeof (info[0]));
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done:
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if (unlikely (!new_pos || !new_info))
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in_error = true;
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if (likely (new_pos))
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pos = new_pos;
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if (likely (new_info))
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info = new_info;
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out_info = separate_out ? (hb_glyph_info_t *) pos : info;
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if (likely (!in_error))
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allocated = new_allocated;
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return likely (!in_error);
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}
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bool
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hb_buffer_t::make_room_for (unsigned int num_in,
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unsigned int num_out)
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{
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if (unlikely (!ensure (out_len + num_out))) return false;
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if (out_info == info &&
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out_len + num_out > idx + num_in)
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{
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assert (have_output);
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out_info = (hb_glyph_info_t *) pos;
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memcpy (out_info, info, out_len * sizeof (out_info[0]));
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}
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return true;
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}
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void *
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hb_buffer_t::get_scratch_buffer (unsigned int *size)
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{
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have_output = false;
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have_positions = false;
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out_len = 0;
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out_info = info;
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*size = allocated * sizeof (pos[0]);
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return pos;
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}
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/* HarfBuzz-Internal API */
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void
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hb_buffer_t::reset (void)
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{
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if (unlikely (hb_object_is_inert (this)))
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return;
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hb_unicode_funcs_destroy (unicode);
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unicode = hb_unicode_funcs_get_default ();
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clear ();
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}
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void
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hb_buffer_t::clear (void)
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{
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if (unlikely (hb_object_is_inert (this)))
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return;
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hb_segment_properties_t default_props = HB_SEGMENT_PROPERTIES_DEFAULT;
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props = default_props;
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flags = HB_BUFFER_FLAGS_DEFAULT;
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content_type = HB_BUFFER_CONTENT_TYPE_INVALID;
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in_error = false;
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have_output = false;
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have_positions = false;
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idx = 0;
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len = 0;
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out_len = 0;
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out_info = info;
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serial = 0;
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memset (allocated_var_bytes, 0, sizeof allocated_var_bytes);
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memset (allocated_var_owner, 0, sizeof allocated_var_owner);
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memset (context, 0, sizeof context);
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memset (context_len, 0, sizeof context_len);
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}
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void
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hb_buffer_t::add (hb_codepoint_t codepoint,
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unsigned int cluster)
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{
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hb_glyph_info_t *glyph;
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if (unlikely (!ensure (len + 1))) return;
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glyph = &info[len];
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memset (glyph, 0, sizeof (*glyph));
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glyph->codepoint = codepoint;
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glyph->mask = 1;
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glyph->cluster = cluster;
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len++;
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}
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void
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hb_buffer_t::add_info (const hb_glyph_info_t &glyph_info)
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{
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if (unlikely (!ensure (len + 1))) return;
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info[len] = glyph_info;
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len++;
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}
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void
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hb_buffer_t::remove_output (void)
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{
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if (unlikely (hb_object_is_inert (this)))
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return;
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have_output = false;
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have_positions = false;
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out_len = 0;
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out_info = info;
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}
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void
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hb_buffer_t::clear_output (void)
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{
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if (unlikely (hb_object_is_inert (this)))
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return;
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have_output = true;
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have_positions = false;
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out_len = 0;
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out_info = info;
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}
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void
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hb_buffer_t::clear_positions (void)
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{
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if (unlikely (hb_object_is_inert (this)))
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return;
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have_output = false;
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have_positions = true;
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out_len = 0;
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out_info = info;
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memset (pos, 0, sizeof (pos[0]) * len);
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}
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void
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hb_buffer_t::swap_buffers (void)
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{
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if (unlikely (in_error)) return;
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assert (have_output);
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have_output = false;
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if (out_info != info)
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{
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hb_glyph_info_t *tmp_string;
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tmp_string = info;
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info = out_info;
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out_info = tmp_string;
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pos = (hb_glyph_position_t *) out_info;
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}
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unsigned int tmp;
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tmp = len;
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len = out_len;
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out_len = tmp;
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idx = 0;
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}
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void
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hb_buffer_t::replace_glyphs (unsigned int num_in,
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unsigned int num_out,
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const uint32_t *glyph_data)
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{
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if (unlikely (!make_room_for (num_in, num_out))) return;
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merge_clusters (idx, idx + num_in);
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hb_glyph_info_t orig_info = info[idx];
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hb_glyph_info_t *pinfo = &out_info[out_len];
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for (unsigned int i = 0; i < num_out; i++)
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{
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*pinfo = orig_info;
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pinfo->codepoint = glyph_data[i];
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pinfo++;
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}
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idx += num_in;
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out_len += num_out;
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}
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void
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hb_buffer_t::output_glyph (hb_codepoint_t glyph_index)
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{
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if (unlikely (!make_room_for (0, 1))) return;
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out_info[out_len] = info[idx];
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out_info[out_len].codepoint = glyph_index;
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out_len++;
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}
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void
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hb_buffer_t::output_info (const hb_glyph_info_t &glyph_info)
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{
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if (unlikely (!make_room_for (0, 1))) return;
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out_info[out_len] = glyph_info;
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out_len++;
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}
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void
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hb_buffer_t::copy_glyph (void)
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{
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if (unlikely (!make_room_for (0, 1))) return;
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out_info[out_len] = info[idx];
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out_len++;
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}
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void
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hb_buffer_t::replace_glyph (hb_codepoint_t glyph_index)
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{
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if (unlikely (out_info != info || out_len != idx)) {
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if (unlikely (!make_room_for (1, 1))) return;
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out_info[out_len] = info[idx];
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}
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out_info[out_len].codepoint = glyph_index;
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idx++;
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out_len++;
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}
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void
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hb_buffer_t::set_masks (hb_mask_t value,
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hb_mask_t mask,
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unsigned int cluster_start,
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unsigned int cluster_end)
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{
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hb_mask_t not_mask = ~mask;
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value &= mask;
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if (!mask)
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return;
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if (cluster_start == 0 && cluster_end == (unsigned int)-1) {
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unsigned int count = len;
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for (unsigned int i = 0; i < count; i++)
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info[i].mask = (info[i].mask & not_mask) | value;
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return;
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}
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unsigned int count = len;
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for (unsigned int i = 0; i < count; i++)
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if (cluster_start <= info[i].cluster && info[i].cluster < cluster_end)
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info[i].mask = (info[i].mask & not_mask) | value;
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}
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void
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hb_buffer_t::reverse_range (unsigned int start,
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unsigned int end)
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{
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unsigned int i, j;
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if (start == end - 1)
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return;
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for (i = start, j = end - 1; i < j; i++, j--) {
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hb_glyph_info_t t;
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t = info[i];
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info[i] = info[j];
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info[j] = t;
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}
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if (pos) {
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for (i = start, j = end - 1; i < j; i++, j--) {
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hb_glyph_position_t t;
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t = pos[i];
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pos[i] = pos[j];
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pos[j] = t;
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}
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}
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}
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void
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hb_buffer_t::reverse (void)
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{
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if (unlikely (!len))
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return;
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reverse_range (0, len);
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}
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void
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hb_buffer_t::reverse_clusters (void)
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{
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unsigned int i, start, count, last_cluster;
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if (unlikely (!len))
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return;
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reverse ();
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count = len;
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start = 0;
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last_cluster = info[0].cluster;
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for (i = 1; i < count; i++) {
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if (last_cluster != info[i].cluster) {
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reverse_range (start, i);
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start = i;
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last_cluster = info[i].cluster;
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}
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}
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reverse_range (start, i);
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}
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void
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hb_buffer_t::merge_clusters (unsigned int start,
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unsigned int end)
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{
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if (unlikely (end - start < 2))
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return;
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unsigned int cluster = info[start].cluster;
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for (unsigned int i = start + 1; i < end; i++)
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cluster = MIN (cluster, info[i].cluster);
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/* Extend end */
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while (end < len && info[end - 1].cluster == info[end].cluster)
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end++;
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/* Extend start */
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while (idx < start && info[start - 1].cluster == info[start].cluster)
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start--;
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/* If we hit the start of buffer, continue in out-buffer. */
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if (idx == start)
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for (unsigned i = out_len; i && out_info[i - 1].cluster == info[start].cluster; i--)
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out_info[i - 1].cluster = cluster;
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for (unsigned int i = start; i < end; i++)
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info[i].cluster = cluster;
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}
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void
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hb_buffer_t::merge_out_clusters (unsigned int start,
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unsigned int end)
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{
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if (unlikely (end - start < 2))
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return;
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unsigned int cluster = out_info[start].cluster;
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for (unsigned int i = start + 1; i < end; i++)
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cluster = MIN (cluster, out_info[i].cluster);
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/* Extend start */
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while (start && out_info[start - 1].cluster == out_info[start].cluster)
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start--;
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/* Extend end */
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while (end < out_len && out_info[end - 1].cluster == out_info[end].cluster)
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end++;
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/* If we hit the end of out-buffer, continue in buffer. */
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if (end == out_len)
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for (unsigned i = idx; i < len && info[i].cluster == out_info[end - 1].cluster; i++)
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info[i].cluster = cluster;
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for (unsigned int i = start; i < end; i++)
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out_info[i].cluster = cluster;
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}
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void
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hb_buffer_t::guess_segment_properties (void)
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{
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assert (content_type == HB_BUFFER_CONTENT_TYPE_UNICODE ||
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(!len && content_type == HB_BUFFER_CONTENT_TYPE_INVALID));
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/* If script is set to INVALID, guess from buffer contents */
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if (props.script == HB_SCRIPT_INVALID) {
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for (unsigned int i = 0; i < len; i++) {
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hb_script_t script = unicode->script (info[i].codepoint);
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if (likely (script != HB_SCRIPT_COMMON &&
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script != HB_SCRIPT_INHERITED &&
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script != HB_SCRIPT_UNKNOWN)) {
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props.script = script;
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break;
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}
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}
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}
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/* If direction is set to INVALID, guess from script */
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if (props.direction == HB_DIRECTION_INVALID) {
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props.direction = hb_script_get_horizontal_direction (props.script);
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}
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/* If language is not set, use default language from locale */
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if (props.language == HB_LANGUAGE_INVALID) {
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/* TODO get_default_for_script? using $LANGUAGE */
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props.language = hb_language_get_default ();
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}
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}
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static inline void
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dump_var_allocation (const hb_buffer_t *buffer)
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{
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char buf[80];
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for (unsigned int i = 0; i < 8; i++)
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buf[i] = '0' + buffer->allocated_var_bytes[7 - i];
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buf[8] = '\0';
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DEBUG_MSG (BUFFER, buffer,
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"Current var allocation: %s",
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buf);
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}
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void hb_buffer_t::allocate_var (unsigned int byte_i, unsigned int count, const char *owner)
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{
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assert (byte_i < 8 && byte_i + count <= 8);
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if (DEBUG_ENABLED (BUFFER))
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dump_var_allocation (this);
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DEBUG_MSG (BUFFER, this,
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"Allocating var bytes %d..%d for %s",
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byte_i, byte_i + count - 1, owner);
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for (unsigned int i = byte_i; i < byte_i + count; i++) {
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assert (!allocated_var_bytes[i]);
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allocated_var_bytes[i]++;
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allocated_var_owner[i] = owner;
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}
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}
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void hb_buffer_t::deallocate_var (unsigned int byte_i, unsigned int count, const char *owner)
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{
|
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if (DEBUG_ENABLED (BUFFER))
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dump_var_allocation (this);
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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_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_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_FLAGS_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_t *
|
|
hb_buffer_reference (hb_buffer_t *buffer)
|
|
{
|
|
return hb_object_reference (buffer);
|
|
}
|
|
|
|
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_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);
|
|
}
|
|
|
|
void *
|
|
hb_buffer_get_user_data (hb_buffer_t *buffer,
|
|
hb_user_data_key_t *key)
|
|
{
|
|
return hb_object_get_user_data (buffer, key);
|
|
}
|
|
|
|
|
|
void
|
|
hb_buffer_set_content_type (hb_buffer_t *buffer,
|
|
hb_buffer_content_type_t content_type)
|
|
{
|
|
buffer->content_type = content_type;
|
|
}
|
|
|
|
hb_buffer_content_type_t
|
|
hb_buffer_get_content_type (hb_buffer_t *buffer)
|
|
{
|
|
return buffer->content_type;
|
|
}
|
|
|
|
|
|
void
|
|
hb_buffer_set_unicode_funcs (hb_buffer_t *buffer,
|
|
hb_unicode_funcs_t *unicode)
|
|
{
|
|
if (unlikely (hb_object_is_inert (buffer)))
|
|
return;
|
|
|
|
if (!unicode)
|
|
unicode = hb_unicode_funcs_get_default ();
|
|
|
|
|
|
hb_unicode_funcs_reference (unicode);
|
|
hb_unicode_funcs_destroy (buffer->unicode);
|
|
buffer->unicode = unicode;
|
|
}
|
|
|
|
hb_unicode_funcs_t *
|
|
hb_buffer_get_unicode_funcs (hb_buffer_t *buffer)
|
|
{
|
|
return buffer->unicode;
|
|
}
|
|
|
|
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_direction_t
|
|
hb_buffer_get_direction (hb_buffer_t *buffer)
|
|
{
|
|
return buffer->props.direction;
|
|
}
|
|
|
|
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_script_t
|
|
hb_buffer_get_script (hb_buffer_t *buffer)
|
|
{
|
|
return buffer->props.script;
|
|
}
|
|
|
|
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_language_t
|
|
hb_buffer_get_language (hb_buffer_t *buffer)
|
|
{
|
|
return buffer->props.language;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
void
|
|
hb_buffer_get_segment_properties (hb_buffer_t *buffer,
|
|
hb_segment_properties_t *props)
|
|
{
|
|
*props = buffer->props;
|
|
}
|
|
|
|
|
|
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_flags_t
|
|
hb_buffer_get_flags (hb_buffer_t *buffer)
|
|
{
|
|
return buffer->flags;
|
|
}
|
|
|
|
|
|
void
|
|
hb_buffer_reset (hb_buffer_t *buffer)
|
|
{
|
|
buffer->reset ();
|
|
}
|
|
|
|
void
|
|
hb_buffer_clear_contents (hb_buffer_t *buffer)
|
|
{
|
|
buffer->clear ();
|
|
}
|
|
|
|
hb_bool_t
|
|
hb_buffer_pre_allocate (hb_buffer_t *buffer, unsigned int size)
|
|
{
|
|
return buffer->ensure (size);
|
|
}
|
|
|
|
hb_bool_t
|
|
hb_buffer_allocation_successful (hb_buffer_t *buffer)
|
|
{
|
|
return !buffer->in_error;
|
|
}
|
|
|
|
void
|
|
hb_buffer_add (hb_buffer_t *buffer,
|
|
hb_codepoint_t codepoint,
|
|
unsigned int cluster)
|
|
{
|
|
buffer->add (codepoint, cluster);
|
|
buffer->clear_context (1);
|
|
}
|
|
|
|
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->clear_context (0);
|
|
buffer->clear_context (1);
|
|
|
|
return true;
|
|
}
|
|
|
|
unsigned int
|
|
hb_buffer_get_length (hb_buffer_t *buffer)
|
|
{
|
|
return buffer->len;
|
|
}
|
|
|
|
/* Return value valid as long as buffer not modified */
|
|
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;
|
|
}
|
|
|
|
/* Return value valid as long as buffer not modified */
|
|
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;
|
|
}
|
|
|
|
void
|
|
hb_buffer_reverse (hb_buffer_t *buffer)
|
|
{
|
|
buffer->reverse ();
|
|
}
|
|
|
|
void
|
|
hb_buffer_reverse_clusters (hb_buffer_t *buffer)
|
|
{
|
|
buffer->reverse_clusters ();
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|