2008-01-15 22:46:32 +00:00
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/*
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* Copyright (C) 1998-2004 David Turner and Werner Lemberg
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* Copyright (C) 2004,2007 Red Hat, Inc.
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2006-03-31 12:28:09 +00:00
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*
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2008-01-15 22:46:32 +00:00
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* This is part of HarfBuzz, an OpenType Layout engine library.
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2006-03-31 12:28:09 +00:00
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*
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2008-01-15 22:46:32 +00:00
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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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2006-03-31 12:28:09 +00:00
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*/
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2009-05-20 09:42:12 +00:00
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#include "hb-buffer-private.h"
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2006-03-31 12:28:09 +00:00
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2009-05-25 07:39:11 +00:00
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#include <string.h>
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2007-10-11 00:07:58 +00:00
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/* Here is how the buffer works internally:
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*
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* There are two string pointers: in_string and out_string. They
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* always have same allocated size, but different length and positions.
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*
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* As an optimization, both in_string and out_string may point to the
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* same piece of memory, which is owned by in_string. This remains the
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* case as long as:
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*
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* - copy_glyph() is called
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* - replace_glyph() is called with inplace=TRUE
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* - add_output_glyph() and add_output_glyphs() are not called
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*
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* In that case swap(), and copy_glyph(), and replace_glyph() are all
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* mostly no-op.
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*
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* As soon an add_output_glyph[s]() or replace_glyph() with inplace=FALSE is
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* called, out_string is moved over to an alternate buffer (alt_string), and
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* its current contents (out_length entries) are copied to the alt buffer.
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* This should all remain transparent to the user. swap() then switches
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* in_string and alt_string. alt_string is not allocated until its needed,
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* but after that it's grown with in_string unconditionally.
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*
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2007-10-11 07:12:49 +00:00
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* The buffer->separate_out boolean keeps status of whether out_string points
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* to in_string (FALSE) or alt_string (TRUE).
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2007-10-11 00:07:58 +00:00
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*/
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2009-05-25 08:04:24 +00:00
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/* XXX err handling */
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2007-10-11 08:30:50 +00:00
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/* Internal API */
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2009-05-25 07:39:11 +00:00
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static void
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2009-05-25 08:04:24 +00:00
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hb_buffer_ensure (hb_buffer_t *buffer, unsigned int size)
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2006-03-31 12:28:09 +00:00
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{
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2009-05-20 10:01:16 +00:00
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unsigned int new_allocated = buffer->allocated;
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2006-03-31 12:28:09 +00:00
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if (size > new_allocated)
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{
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while (size > new_allocated)
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new_allocated += (new_allocated >> 1) + 8;
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2009-05-17 09:52:32 +00:00
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2009-05-20 09:35:14 +00:00
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if (buffer->positions)
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buffer->positions = realloc (buffer->positions, new_allocated * sizeof (buffer->positions[0]));
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2007-10-11 07:05:09 +00:00
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2009-05-20 09:35:14 +00:00
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buffer->in_string = realloc (buffer->in_string, new_allocated * sizeof (buffer->in_string[0]));
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2007-10-11 07:05:09 +00:00
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2009-05-20 09:35:14 +00:00
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if (buffer->separate_out)
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2007-10-11 07:12:49 +00:00
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{
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2009-05-20 09:35:14 +00:00
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buffer->alt_string = realloc (buffer->alt_string, new_allocated * sizeof (buffer->alt_string[0]));
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2007-10-11 07:12:49 +00:00
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buffer->out_string = buffer->alt_string;
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}
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else
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2007-10-11 00:07:58 +00:00
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{
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buffer->out_string = buffer->in_string;
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2009-05-20 09:35:14 +00:00
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if (buffer->alt_string)
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2007-10-11 00:07:58 +00:00
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{
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2009-05-20 09:35:14 +00:00
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free (buffer->alt_string);
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buffer->alt_string = NULL;
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2007-10-11 00:07:58 +00:00
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}
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}
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2006-03-31 12:28:09 +00:00
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buffer->allocated = new_allocated;
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}
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}
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2009-05-25 08:04:24 +00:00
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static void
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hb_buffer_duplicate_out_buffer (hb_buffer_t *buffer)
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2007-10-11 00:07:58 +00:00
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{
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2009-05-20 09:35:14 +00:00
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if (!buffer->alt_string)
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buffer->alt_string = malloc (buffer->allocated * sizeof (buffer->alt_string[0]));
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2007-10-11 00:07:58 +00:00
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buffer->out_string = buffer->alt_string;
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2009-05-20 09:35:14 +00:00
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memcpy (buffer->out_string, buffer->in_string, buffer->out_length * sizeof (buffer->out_string[0]));
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2007-10-11 07:12:49 +00:00
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buffer->separate_out = TRUE;
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2009-05-25 08:04:24 +00:00
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}
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2007-10-11 00:07:58 +00:00
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2009-05-25 08:04:24 +00:00
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static void
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hb_buffer_ensure_separate (hb_buffer_t *buffer, unsigned int size)
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{
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hb_buffer_ensure (buffer, size);
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if ( !buffer->separate_out )
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hb_buffer_duplicate_out_buffer (buffer);
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2007-10-11 00:07:58 +00:00
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}
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2007-10-11 08:30:50 +00:00
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/* Public API */
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2009-05-20 09:35:14 +00:00
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hb_buffer_t *
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hb_buffer_new (void)
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2006-03-31 12:28:09 +00:00
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{
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2009-05-20 09:35:14 +00:00
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hb_buffer_t *buffer;
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buffer = malloc (sizeof (hb_buffer_t));
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if (HB_UNLIKELY (!buffer))
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return NULL;
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2006-03-31 12:28:09 +00:00
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2007-10-11 07:21:31 +00:00
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buffer->allocated = 0;
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buffer->in_string = NULL;
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buffer->alt_string = NULL;
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buffer->positions = NULL;
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2006-03-31 12:28:09 +00:00
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2009-05-20 09:35:14 +00:00
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hb_buffer_clear (buffer);
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2007-10-11 07:21:31 +00:00
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2009-05-20 09:35:14 +00:00
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return buffer;
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2007-10-11 00:07:58 +00:00
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}
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2006-03-31 12:28:09 +00:00
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2007-10-11 07:21:31 +00:00
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void
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2009-05-25 08:04:24 +00:00
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hb_buffer_free (hb_buffer_t *buffer)
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2007-10-11 07:21:31 +00:00
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{
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2009-05-20 09:35:14 +00:00
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free (buffer->in_string);
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free (buffer->alt_string);
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free (buffer->positions);
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free (buffer);
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2007-10-11 07:21:31 +00:00
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}
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void
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2009-05-25 08:04:24 +00:00
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hb_buffer_clear (hb_buffer_t *buffer)
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2007-10-11 07:21:31 +00:00
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{
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buffer->in_length = 0;
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buffer->out_length = 0;
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buffer->in_pos = 0;
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buffer->out_pos = 0;
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buffer->out_string = buffer->in_string;
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buffer->separate_out = FALSE;
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2009-05-25 08:04:24 +00:00
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buffer->max_lig_id = 0;
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2007-10-11 07:21:31 +00:00
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}
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2009-05-20 09:35:14 +00:00
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void
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2009-05-20 10:01:16 +00:00
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hb_buffer_add_glyph (hb_buffer_t *buffer,
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hb_codepoint_t glyph_index,
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unsigned int properties,
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unsigned int cluster)
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2007-10-11 08:30:50 +00:00
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{
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2009-05-25 08:04:24 +00:00
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hb_glyph_info_t *glyph;
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2009-05-20 09:42:12 +00:00
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2009-05-20 09:35:14 +00:00
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hb_buffer_ensure (buffer, buffer->in_length + 1);
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2007-10-11 08:30:50 +00:00
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glyph = &buffer->in_string[buffer->in_length];
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glyph->gindex = glyph_index;
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glyph->properties = properties;
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glyph->cluster = cluster;
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glyph->component = 0;
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glyph->ligID = 0;
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2009-05-25 08:04:24 +00:00
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glyph->gproperty = HB_BUFFER_GLYPH_PROPERTIES_UNKNOWN;
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2007-10-11 08:30:50 +00:00
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2009-05-20 09:35:14 +00:00
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buffer->in_length++;
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2007-10-11 08:30:50 +00:00
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}
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/* HarfBuzz-Internal API */
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HB_INTERNAL void
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2009-05-25 08:04:24 +00:00
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_hb_buffer_clear_output (hb_buffer_t *buffer)
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2007-10-11 07:21:31 +00:00
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{
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buffer->out_length = 0;
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buffer->out_pos = 0;
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buffer->out_string = buffer->in_string;
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buffer->separate_out = FALSE;
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}
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2009-05-25 08:04:24 +00:00
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HB_INTERNAL void
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_hb_buffer_clear_positions (hb_buffer_t *buffer)
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2007-10-11 07:05:09 +00:00
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{
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2009-05-17 10:03:42 +00:00
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_hb_buffer_clear_output (buffer);
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2009-05-25 08:04:24 +00:00
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if (HB_UNLIKELY (!buffer->positions))
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{
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buffer->positions = calloc (buffer->allocated, sizeof (buffer->positions[0]));
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return;
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}
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2007-10-11 07:05:09 +00:00
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memset (buffer->positions, 0, sizeof (buffer->positions[0]) * buffer->in_length);
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}
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2007-10-11 08:30:50 +00:00
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HB_INTERNAL void
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2009-05-25 08:04:24 +00:00
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_hb_buffer_swap (hb_buffer_t *buffer)
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2006-03-31 12:28:09 +00:00
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{
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2009-05-25 08:04:24 +00:00
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unsigned int tmp;
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2006-03-31 12:28:09 +00:00
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2009-05-20 09:35:14 +00:00
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if (buffer->separate_out)
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2007-10-11 00:07:58 +00:00
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{
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2009-05-25 08:04:24 +00:00
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hb_glyph_info_t *tmp_string;
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2007-10-11 00:07:58 +00:00
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tmp_string = buffer->in_string;
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buffer->in_string = buffer->out_string;
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buffer->out_string = tmp_string;
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buffer->alt_string = buffer->out_string;
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}
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2006-03-31 12:28:09 +00:00
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2009-05-25 08:04:24 +00:00
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tmp = buffer->in_length;
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2006-03-31 12:28:09 +00:00
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buffer->in_length = buffer->out_length;
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2009-05-25 08:04:24 +00:00
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buffer->out_length = tmp;
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2006-03-31 12:28:09 +00:00
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2009-05-25 08:04:24 +00:00
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tmp = buffer->in_pos;
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2007-10-11 00:07:58 +00:00
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buffer->in_pos = buffer->out_pos;
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2009-05-25 08:04:24 +00:00
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buffer->out_pos = tmp;
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2006-03-31 12:28:09 +00:00
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}
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/* The following function copies `num_out' elements from `glyph_data'
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to `buffer->out_string', advancing the in array pointer in the structure
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by `num_in' elements, and the out array pointer by `num_out' elements.
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Finally, it sets the `length' field of `out' equal to
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`pos' of the `out' structure.
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If `component' is 0xFFFF, the component value from buffer->in_pos
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will copied `num_out' times, otherwise `component' itself will
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be used to fill the `component' fields.
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If `ligID' is 0xFFFF, the ligID value from buffer->in_pos
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will copied `num_out' times, otherwise `ligID' itself will
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be used to fill the `ligID' fields.
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The properties for all replacement glyphs are taken
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from the glyph at position `buffer->in_pos'.
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The cluster value for the glyph at position buffer->in_pos is used
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for all replacement glyphs */
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2009-05-25 08:04:24 +00:00
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HB_INTERNAL void
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2009-05-20 10:01:16 +00:00
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_hb_buffer_add_output_glyphs (hb_buffer_t *buffer,
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unsigned int num_in,
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unsigned int num_out,
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2009-05-25 07:39:11 +00:00
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const uint16_t *glyph_data_be,
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2009-05-20 10:01:16 +00:00
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unsigned short component,
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unsigned short ligID)
|
2006-03-31 12:28:09 +00:00
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{
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2009-05-20 10:01:16 +00:00
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unsigned int i;
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unsigned int properties;
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unsigned int cluster;
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2006-03-31 12:28:09 +00:00
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2009-05-25 08:04:24 +00:00
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hb_buffer_ensure_separate (buffer, buffer->out_pos + num_out);
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2007-10-11 00:07:58 +00:00
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2006-03-31 12:28:09 +00:00
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properties = buffer->in_string[buffer->in_pos].properties;
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cluster = buffer->in_string[buffer->in_pos].cluster;
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2009-05-25 08:04:24 +00:00
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if (component == 0xFFFF)
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2006-03-31 12:28:09 +00:00
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component = buffer->in_string[buffer->in_pos].component;
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2009-05-25 08:04:24 +00:00
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if (ligID == 0xFFFF)
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2006-03-31 12:28:09 +00:00
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ligID = buffer->in_string[buffer->in_pos].ligID;
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2009-05-25 08:04:24 +00:00
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for (i = 0; i < num_out; i++)
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2006-03-31 12:28:09 +00:00
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{
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2009-05-25 08:04:24 +00:00
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hb_glyph_info_t *info = &buffer->out_string[buffer->out_pos + i];
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info->gindex = hb_be_uint16_t (glyph_data_be[i]);
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info->properties = properties;
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info->cluster = cluster;
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info->component = component;
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info->ligID = ligID;
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info->gproperty = HB_BUFFER_GLYPH_PROPERTIES_UNKNOWN;
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2006-03-31 12:28:09 +00:00
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}
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buffer->in_pos += num_in;
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buffer->out_pos += num_out;
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buffer->out_length = buffer->out_pos;
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}
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2009-05-25 07:39:11 +00:00
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2009-05-25 08:04:24 +00:00
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HB_INTERNAL void
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2009-05-20 10:01:16 +00:00
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_hb_buffer_add_output_glyph (hb_buffer_t *buffer,
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hb_codepoint_t glyph_index,
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unsigned short component,
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|
|
unsigned short ligID)
|
2006-03-31 12:28:09 +00:00
|
|
|
{
|
2009-05-25 08:04:24 +00:00
|
|
|
hb_glyph_info_t *info;
|
|
|
|
|
|
|
|
hb_buffer_ensure_separate (buffer, buffer->out_pos + 1);
|
2006-03-31 12:28:09 +00:00
|
|
|
|
2009-05-25 08:04:24 +00:00
|
|
|
info = &buffer->out_string[buffer->out_pos];
|
|
|
|
*info = buffer->in_string[buffer->in_pos];
|
|
|
|
|
|
|
|
info->gindex = glyph_index;
|
|
|
|
if (component != 0xFFFF)
|
|
|
|
info->component = component;
|
|
|
|
if (ligID != 0xFFFF)
|
|
|
|
info->ligID = ligID;
|
|
|
|
info->gproperty = HB_BUFFER_GLYPH_PROPERTIES_UNKNOWN;
|
|
|
|
|
|
|
|
buffer->in_pos++;
|
|
|
|
buffer->out_pos++;
|
|
|
|
|
|
|
|
buffer->out_length = buffer->out_pos;
|
2006-03-31 12:28:09 +00:00
|
|
|
}
|
|
|
|
|
2009-05-25 08:04:24 +00:00
|
|
|
HB_INTERNAL void
|
|
|
|
_hb_buffer_next_glyph (hb_buffer_t *buffer)
|
2009-05-17 10:03:42 +00:00
|
|
|
{
|
2009-05-20 09:35:14 +00:00
|
|
|
if (buffer->separate_out)
|
2007-10-11 00:07:58 +00:00
|
|
|
{
|
2009-05-20 09:35:14 +00:00
|
|
|
hb_buffer_ensure (buffer, buffer->out_pos + 1);
|
2009-05-17 10:03:42 +00:00
|
|
|
|
2007-10-11 00:07:58 +00:00
|
|
|
buffer->out_string[buffer->out_pos] = buffer->in_string[buffer->in_pos];
|
|
|
|
}
|
|
|
|
|
|
|
|
buffer->in_pos++;
|
|
|
|
buffer->out_pos++;
|
2006-03-31 12:28:09 +00:00
|
|
|
buffer->out_length = buffer->out_pos;
|
2007-10-11 00:07:58 +00:00
|
|
|
}
|
|
|
|
|
2009-05-25 08:04:24 +00:00
|
|
|
HB_INTERNAL void
|
2009-05-20 10:01:16 +00:00
|
|
|
_hb_buffer_replace_glyph (hb_buffer_t *buffer,
|
|
|
|
hb_codepoint_t glyph_index)
|
2007-10-11 00:07:58 +00:00
|
|
|
{
|
2009-05-20 09:35:14 +00:00
|
|
|
if (!buffer->separate_out)
|
2007-10-11 00:07:58 +00:00
|
|
|
{
|
2009-05-17 10:03:42 +00:00
|
|
|
buffer->out_string[buffer->out_pos].gindex = glyph_index;
|
2007-10-11 00:07:58 +00:00
|
|
|
|
2009-05-17 10:03:42 +00:00
|
|
|
buffer->in_pos++;
|
|
|
|
buffer->out_pos++;
|
|
|
|
buffer->out_length = buffer->out_pos;
|
2007-10-11 00:07:58 +00:00
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
2009-05-20 09:35:14 +00:00
|
|
|
return _hb_buffer_add_output_glyph (buffer, glyph_index, 0xFFFF, 0xFFFF);
|
2007-10-11 00:07:58 +00:00
|
|
|
}
|
2006-03-31 12:28:09 +00:00
|
|
|
}
|
|
|
|
|
2009-05-20 10:01:16 +00:00
|
|
|
HB_INTERNAL unsigned short
|
2009-05-25 08:04:24 +00:00
|
|
|
_hb_buffer_allocate_lig_id (hb_buffer_t *buffer)
|
2006-03-31 12:28:09 +00:00
|
|
|
{
|
2009-05-25 08:04:24 +00:00
|
|
|
return ++buffer->max_lig_id;
|
2006-03-31 12:28:09 +00:00
|
|
|
}
|