633 lines
14 KiB
C++
633 lines
14 KiB
C++
/*
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* Copyright (C) 1998-2004 David Turner and Werner Lemberg
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* Copyright (C) 2004,2007,2009,2010 Red Hat, 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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*/
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#include "hb-buffer-private.hh"
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#include <string.h>
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HB_BEGIN_DECLS
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static hb_buffer_t _hb_buffer_nil = {
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HB_REFERENCE_COUNT_INVALID, /* ref_count */
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&_hb_unicode_funcs_nil /* unicode */
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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() 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() then
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* switches info and out_info.
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*/
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static hb_bool_t
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_hb_buffer_enlarge (hb_buffer_t *buffer, unsigned int size)
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{
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if (unlikely (buffer->in_error))
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return FALSE;
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unsigned int new_allocated = buffer->allocated;
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hb_glyph_position_t *new_pos;
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hb_glyph_info_t *new_info;
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bool separate_out;
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separate_out = buffer->out_info != buffer->info;
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while (size > new_allocated)
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new_allocated += (new_allocated >> 1) + 8;
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ASSERT_STATIC (sizeof (buffer->info[0]) == sizeof (buffer->pos[0]));
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bool overflows = new_allocated >= ((unsigned int) -1) / sizeof (buffer->info[0]);
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if (unlikely (overflows)) {
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new_pos = NULL;
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new_info = NULL;
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} else {
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new_pos = (hb_glyph_position_t *) realloc (buffer->pos, new_allocated * sizeof (buffer->pos[0]));
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new_info = (hb_glyph_info_t *) realloc (buffer->info, new_allocated * sizeof (buffer->info[0]));
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}
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if (unlikely (!new_pos || !new_info))
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buffer->in_error = TRUE;
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if (likely (new_pos))
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buffer->pos = new_pos;
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if (likely (new_info))
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buffer->info = new_info;
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buffer->out_info = separate_out ? (hb_glyph_info_t *) buffer->pos : buffer->info;
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if (likely (!buffer->in_error))
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buffer->allocated = new_allocated;
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return likely (!buffer->in_error);
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}
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static inline hb_bool_t
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_hb_buffer_ensure (hb_buffer_t *buffer, unsigned int size)
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{
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return likely (size <= buffer->allocated) ? TRUE : _hb_buffer_enlarge (buffer, size);
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}
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static inline hb_bool_t
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_hb_buffer_ensure_separate (hb_buffer_t *buffer, unsigned int size)
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{
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if (unlikely (!_hb_buffer_ensure (buffer, size))) return FALSE;
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if (buffer->out_info == buffer->info)
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{
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assert (buffer->have_output);
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buffer->out_info = (hb_glyph_info_t *) buffer->pos;
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memcpy (buffer->out_info, buffer->info, buffer->out_len * sizeof (buffer->out_info[0]));
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}
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return TRUE;
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}
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/* Public API */
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hb_buffer_t *
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hb_buffer_create (unsigned int pre_alloc_size)
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{
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hb_buffer_t *buffer;
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if (!HB_OBJECT_DO_CREATE (hb_buffer_t, buffer))
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return &_hb_buffer_nil;
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if (pre_alloc_size)
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_hb_buffer_ensure (buffer, pre_alloc_size);
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buffer->unicode = &_hb_unicode_funcs_nil;
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return buffer;
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}
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hb_buffer_t *
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hb_buffer_reference (hb_buffer_t *buffer)
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{
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HB_OBJECT_DO_REFERENCE (buffer);
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}
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unsigned int
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hb_buffer_get_reference_count (hb_buffer_t *buffer)
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{
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HB_OBJECT_DO_GET_REFERENCE_COUNT (buffer);
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}
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void
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hb_buffer_destroy (hb_buffer_t *buffer)
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{
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HB_OBJECT_DO_DESTROY (buffer);
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hb_unicode_funcs_destroy (buffer->unicode);
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free (buffer->info);
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free (buffer->pos);
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free (buffer);
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}
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void
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hb_buffer_set_unicode_funcs (hb_buffer_t *buffer,
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hb_unicode_funcs_t *unicode)
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{
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if (!unicode)
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unicode = &_hb_unicode_funcs_nil;
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hb_unicode_funcs_reference (unicode);
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hb_unicode_funcs_destroy (buffer->unicode);
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buffer->unicode = unicode;
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}
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hb_unicode_funcs_t *
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hb_buffer_get_unicode_funcs (hb_buffer_t *buffer)
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{
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return buffer->unicode;
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}
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void
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hb_buffer_set_direction (hb_buffer_t *buffer,
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hb_direction_t direction)
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{
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buffer->props.direction = direction;
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}
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hb_direction_t
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hb_buffer_get_direction (hb_buffer_t *buffer)
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{
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return buffer->props.direction;
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}
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void
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hb_buffer_set_script (hb_buffer_t *buffer,
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hb_script_t script)
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{
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buffer->props.script = script;
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}
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hb_script_t
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hb_buffer_get_script (hb_buffer_t *buffer)
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{
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return buffer->props.script;
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}
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void
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hb_buffer_set_language (hb_buffer_t *buffer,
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hb_language_t language)
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{
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buffer->props.language = language;
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}
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hb_language_t
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hb_buffer_get_language (hb_buffer_t *buffer)
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{
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return buffer->props.language;
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}
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void
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hb_buffer_clear (hb_buffer_t *buffer)
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{
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buffer->have_output = FALSE;
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buffer->have_positions = FALSE;
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buffer->in_error = FALSE;
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buffer->len = 0;
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buffer->out_len = 0;
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buffer->i = 0;
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buffer->out_info = buffer->info;
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buffer->serial = 0;
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}
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hb_bool_t
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hb_buffer_ensure (hb_buffer_t *buffer, unsigned int size)
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{
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return _hb_buffer_ensure (buffer, size);
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}
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void
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hb_buffer_add_glyph (hb_buffer_t *buffer,
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hb_codepoint_t codepoint,
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hb_mask_t mask,
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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 (!_hb_buffer_ensure (buffer, buffer->len + 1))) return;
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glyph = &buffer->info[buffer->len];
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memset (glyph, 0, sizeof (*glyph));
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glyph->codepoint = codepoint;
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glyph->mask = mask;
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glyph->cluster = cluster;
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buffer->len++;
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}
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void
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hb_buffer_clear_positions (hb_buffer_t *buffer)
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{
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_hb_buffer_clear_output (buffer);
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buffer->have_output = FALSE;
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buffer->have_positions = TRUE;
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memset (buffer->pos, 0, sizeof (buffer->pos[0]) * buffer->len);
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}
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/* HarfBuzz-Internal API */
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void
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_hb_buffer_clear_output (hb_buffer_t *buffer)
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{
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buffer->have_output = TRUE;
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buffer->have_positions = FALSE;
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buffer->out_len = 0;
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buffer->out_info = buffer->info;
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}
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void
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_hb_buffer_swap (hb_buffer_t *buffer)
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{
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unsigned int tmp;
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assert (buffer->have_output);
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if (unlikely (buffer->in_error)) return;
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if (buffer->out_info != buffer->info)
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{
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hb_glyph_info_t *tmp_string;
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tmp_string = buffer->info;
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buffer->info = buffer->out_info;
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buffer->out_info = tmp_string;
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buffer->pos = (hb_glyph_position_t *) buffer->out_info;
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}
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tmp = buffer->len;
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buffer->len = buffer->out_len;
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buffer->out_len = tmp;
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buffer->i = 0;
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}
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void
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_hb_buffer_replace_glyphs_be16 (hb_buffer_t *buffer,
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unsigned int num_in,
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unsigned int num_out,
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const uint16_t *glyph_data_be)
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{
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if (buffer->out_info != buffer->info ||
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buffer->out_len + num_out > buffer->i + num_in)
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{
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if (unlikely (!_hb_buffer_ensure_separate (buffer, buffer->out_len + num_out)))
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return;
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}
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hb_glyph_info_t orig_info = buffer->info[buffer->i];
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for (unsigned int i = 0; i < num_out; i++)
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{
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hb_glyph_info_t *info = &buffer->out_info[buffer->out_len + i];
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*info = orig_info;
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info->codepoint = hb_be_uint16 (glyph_data_be[i]);
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}
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buffer->i += num_in;
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buffer->out_len += num_out;
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}
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void
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_hb_buffer_replace_glyph (hb_buffer_t *buffer,
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hb_codepoint_t glyph_index)
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{
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hb_glyph_info_t *info;
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if (buffer->out_info != buffer->info)
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{
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if (unlikely (!_hb_buffer_ensure (buffer, buffer->out_len + 1))) return;
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buffer->out_info[buffer->out_len] = buffer->info[buffer->i];
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}
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else if (buffer->out_len != buffer->i)
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buffer->out_info[buffer->out_len] = buffer->info[buffer->i];
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info = &buffer->out_info[buffer->out_len];
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info->codepoint = glyph_index;
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buffer->i++;
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buffer->out_len++;
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}
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void
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_hb_buffer_next_glyph (hb_buffer_t *buffer)
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{
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if (buffer->have_output)
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{
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if (buffer->out_info != buffer->info)
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{
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if (unlikely (!_hb_buffer_ensure (buffer, buffer->out_len + 1))) return;
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buffer->out_info[buffer->out_len] = buffer->info[buffer->i];
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}
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else if (buffer->out_len != buffer->i)
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buffer->out_info[buffer->out_len] = buffer->info[buffer->i];
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buffer->out_len++;
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}
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buffer->i++;
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}
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void
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_hb_buffer_reset_masks (hb_buffer_t *buffer,
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hb_mask_t mask)
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{
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unsigned int count = buffer->len;
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for (unsigned int i = 0; i < count; i++)
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buffer->info[i].mask = mask;
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}
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void
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_hb_buffer_add_masks (hb_buffer_t *buffer,
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hb_mask_t mask)
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{
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unsigned int count = buffer->len;
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for (unsigned int i = 0; i < count; i++)
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buffer->info[i].mask |= mask;
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}
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void
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_hb_buffer_set_masks (hb_buffer_t *buffer,
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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 = buffer->len;
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for (unsigned int i = 0; i < count; i++)
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buffer->info[i].mask = (buffer->info[i].mask & not_mask) | value;
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return;
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}
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/* XXX can't bsearch since .cluster may not be sorted. */
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/* Binary search to find the start position and go from there. */
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unsigned int min = 0, max = buffer->len;
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while (min < max)
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{
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unsigned int mid = min + ((max - min) / 2);
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if (buffer->info[mid].cluster < cluster_start)
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min = mid + 1;
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else
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max = mid;
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}
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unsigned int count = buffer->len;
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for (unsigned int i = min; i < count && buffer->info[i].cluster < cluster_end; i++)
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buffer->info[i].mask = (buffer->info[i].mask & not_mask) | value;
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}
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/* Public API again */
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unsigned int
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hb_buffer_get_length (hb_buffer_t *buffer)
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{
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return buffer->len;
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}
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/* Return value valid as long as buffer not modified */
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hb_glyph_info_t *
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hb_buffer_get_glyph_infos (hb_buffer_t *buffer)
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{
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return (hb_glyph_info_t *) buffer->info;
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}
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/* Return value valid as long as buffer not modified */
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hb_glyph_position_t *
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hb_buffer_get_glyph_positions (hb_buffer_t *buffer)
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{
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if (!buffer->have_positions)
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hb_buffer_clear_positions (buffer);
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return (hb_glyph_position_t *) buffer->pos;
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}
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static void
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reverse_range (hb_buffer_t *buffer,
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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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for (i = start, j = end - 1; i < j; i++, j--) {
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hb_glyph_info_t t;
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t = buffer->info[i];
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buffer->info[i] = buffer->info[j];
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buffer->info[j] = t;
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}
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if (buffer->pos) {
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for (i = 0, j = end - 1; i < j; i++, j--) {
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hb_glyph_position_t t;
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t = buffer->pos[i];
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buffer->pos[i] = buffer->pos[j];
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buffer->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_reverse (hb_buffer_t *buffer)
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{
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if (unlikely (!buffer->len))
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return;
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reverse_range (buffer, 0, buffer->len);
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}
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void
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hb_buffer_reverse_clusters (hb_buffer_t *buffer)
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{
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unsigned int i, start, count, last_cluster;
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if (unlikely (!buffer->len))
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return;
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hb_buffer_reverse (buffer);
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count = buffer->len;
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start = 0;
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last_cluster = buffer->info[0].cluster;
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for (i = 1; i < count; i++) {
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if (last_cluster != buffer->info[i].cluster) {
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reverse_range (buffer, start, i);
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start = i;
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last_cluster = buffer->info[i].cluster;
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}
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}
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reverse_range (buffer, start, i);
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}
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#define ADD_UTF(T) \
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HB_STMT_START { \
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const T *next = (const T *) text + item_offset; \
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const T *end = next + item_length; \
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while (next < end) { \
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hb_codepoint_t u; \
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const T *old_next = next; \
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next = UTF_NEXT (next, end, u); \
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hb_buffer_add_glyph (buffer, u, 1, old_next - (const T *) text); \
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} \
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} HB_STMT_END
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#define UTF8_COMPUTE(Char, Mask, Len) \
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if (Char < 128) { Len = 1; Mask = 0x7f; } \
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else if ((Char & 0xe0) == 0xc0) { Len = 2; Mask = 0x1f; } \
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else if ((Char & 0xf0) == 0xe0) { Len = 3; Mask = 0x0f; } \
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else if ((Char & 0xf8) == 0xf0) { Len = 4; Mask = 0x07; } \
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else Len = 0;
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static inline const uint8_t *
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hb_utf8_next (const uint8_t *text,
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const uint8_t *end,
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hb_codepoint_t *unicode)
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{
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uint8_t c = *text;
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unsigned int mask, len;
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/* TODO check for overlong sequences? also: optimize? */
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UTF8_COMPUTE (c, mask, len);
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if (unlikely (!len || (unsigned int) (end - text) < len)) {
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*unicode = -1;
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return text + 1;
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} else {
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hb_codepoint_t result;
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unsigned int i;
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result = c & mask;
|
|
for (i = 1; i < len; i++)
|
|
{
|
|
if (unlikely ((text[i] & 0xc0) != 0x80))
|
|
{
|
|
*unicode = -1;
|
|
return text + 1;
|
|
}
|
|
result <<= 6;
|
|
result |= (text[i] & 0x3f);
|
|
}
|
|
*unicode = result;
|
|
return text + len;
|
|
}
|
|
}
|
|
|
|
void
|
|
hb_buffer_add_utf8 (hb_buffer_t *buffer,
|
|
const char *text,
|
|
unsigned int text_length HB_UNUSED,
|
|
unsigned int item_offset,
|
|
unsigned int item_length)
|
|
{
|
|
#define UTF_NEXT(S, E, U) hb_utf8_next (S, E, &(U))
|
|
ADD_UTF (uint8_t);
|
|
#undef UTF_NEXT
|
|
}
|
|
|
|
static inline const uint16_t *
|
|
hb_utf16_next (const uint16_t *text,
|
|
const uint16_t *end,
|
|
hb_codepoint_t *unicode)
|
|
{
|
|
uint16_t c = *text++;
|
|
|
|
if (unlikely (c >= 0xd800 && c < 0xdc00)) {
|
|
/* high surrogate */
|
|
uint16_t l;
|
|
if (text < end && ((l = *text), unlikely (l >= 0xdc00 && l < 0xe000))) {
|
|
/* low surrogate */
|
|
*unicode = ((hb_codepoint_t) ((c) - 0xd800) * 0x400 + (l) - 0xdc00 + 0x10000);
|
|
text++;
|
|
} else
|
|
*unicode = -1;
|
|
} else
|
|
*unicode = c;
|
|
|
|
return text;
|
|
}
|
|
|
|
void
|
|
hb_buffer_add_utf16 (hb_buffer_t *buffer,
|
|
const uint16_t *text,
|
|
unsigned int text_length HB_UNUSED,
|
|
unsigned int item_offset,
|
|
unsigned int item_length)
|
|
{
|
|
#define UTF_NEXT(S, E, U) hb_utf16_next (S, E, &(U))
|
|
ADD_UTF (uint16_t);
|
|
#undef UTF_NEXT
|
|
}
|
|
|
|
void
|
|
hb_buffer_add_utf32 (hb_buffer_t *buffer,
|
|
const uint32_t *text,
|
|
unsigned int text_length HB_UNUSED,
|
|
unsigned int item_offset,
|
|
unsigned int item_length)
|
|
{
|
|
#define UTF_NEXT(S, E, U) ((U) = *(S), (S)+1)
|
|
ADD_UTF (uint32_t);
|
|
#undef UTF_NEXT
|
|
}
|
|
|
|
|
|
HB_END_DECLS
|