517 lines
13 KiB
C
517 lines
13 KiB
C
/*
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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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*
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* This is part of HarfBuzz, an OpenType Layout engine 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.h"
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#include <string.h>
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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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};
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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 out_length doesn't exceed in_length at any time.
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* In that case, swap() is no-op and the glyph operations operate mostly
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* in-place.
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*
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* As soon as out_string gets longer than in_string, out_string is moved over
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* to an alternate buffer (which we reuse the positions buffer for!), and its
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* 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 out_string.
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*/
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/* XXX err handling */
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/* Internal API */
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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->out_string == buffer->in_string)
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{
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assert (buffer->have_output);
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if (!buffer->positions)
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buffer->positions = calloc (buffer->allocated, sizeof (buffer->positions[0]));
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buffer->out_string = (hb_internal_glyph_info_t *) buffer->positions;
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memcpy (buffer->out_string, buffer->in_string, buffer->out_length * sizeof (buffer->out_string[0]));
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}
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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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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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free (buffer->in_string);
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free (buffer->positions);
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free (buffer);
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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->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->max_lig_id = 0;
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}
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void
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hb_buffer_ensure (hb_buffer_t *buffer, unsigned int size)
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{
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unsigned int new_allocated = buffer->allocated;
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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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if (buffer->positions)
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buffer->positions = realloc (buffer->positions, new_allocated * sizeof (buffer->positions[0]));
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if (buffer->out_string != buffer->in_string)
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{
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buffer->in_string = realloc (buffer->in_string, new_allocated * sizeof (buffer->in_string[0]));
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buffer->out_string = (hb_internal_glyph_info_t *) buffer->positions;
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}
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else
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{
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buffer->in_string = realloc (buffer->in_string, new_allocated * sizeof (buffer->in_string[0]));
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buffer->out_string = buffer->in_string;
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}
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buffer->allocated = new_allocated;
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}
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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_internal_glyph_info_t *glyph;
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hb_buffer_ensure (buffer, buffer->in_length + 1);
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glyph = &buffer->in_string[buffer->in_length];
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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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glyph->component = 0;
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glyph->lig_id = 0;
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glyph->gproperty = HB_BUFFER_GLYPH_PROPERTIES_UNKNOWN;
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buffer->in_length++;
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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->direction = direction;
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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->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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}
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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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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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memset (buffer->positions, 0, sizeof (buffer->positions[0]) * buffer->in_length);
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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 (buffer->out_string != buffer->in_string)
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{
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hb_internal_glyph_info_t *tmp_string;
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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->positions = (hb_internal_glyph_position_t *) buffer->out_string;
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}
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tmp = buffer->in_length;
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buffer->in_length = buffer->out_length;
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buffer->out_length = tmp;
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tmp = buffer->in_pos;
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buffer->in_pos = buffer->out_pos;
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buffer->out_pos = tmp;
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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 `lig_id' is 0xFFFF, the lig_id value from buffer->in_pos
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will copied `num_out' times, otherwise `lig_id' itself will
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be used to fill the `lig_id' fields.
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The mask 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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void
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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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const uint16_t *glyph_data_be,
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unsigned short component,
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unsigned short lig_id)
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{
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unsigned int i;
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unsigned int mask;
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unsigned int cluster;
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if (buffer->out_string != buffer->in_string ||
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buffer->out_pos + num_out > buffer->in_pos + num_in)
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{
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hb_buffer_ensure_separate (buffer, buffer->out_pos + num_out);
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}
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mask = buffer->in_string[buffer->in_pos].mask;
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cluster = buffer->in_string[buffer->in_pos].cluster;
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if (component == 0xFFFF)
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component = buffer->in_string[buffer->in_pos].component;
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if (lig_id == 0xFFFF)
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lig_id = buffer->in_string[buffer->in_pos].lig_id;
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for (i = 0; i < num_out; i++)
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{
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hb_internal_glyph_info_t *info = &buffer->out_string[buffer->out_pos + i];
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info->codepoint = hb_be_uint16 (glyph_data_be[i]);
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info->mask = mask;
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info->cluster = cluster;
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info->component = component;
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info->lig_id = lig_id;
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info->gproperty = HB_BUFFER_GLYPH_PROPERTIES_UNKNOWN;
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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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void
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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 lig_id)
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{
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hb_internal_glyph_info_t *info;
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if (buffer->out_string != buffer->in_string)
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{
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hb_buffer_ensure (buffer, buffer->out_pos + 1);
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buffer->out_string[buffer->out_pos] = buffer->in_string[buffer->in_pos];
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}
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else if (buffer->out_pos != buffer->in_pos)
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buffer->out_string[buffer->out_pos] = buffer->in_string[buffer->in_pos];
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info = &buffer->out_string[buffer->out_pos];
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info->codepoint = glyph_index;
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if (component != 0xFFFF)
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info->component = component;
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if (lig_id != 0xFFFF)
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info->lig_id = lig_id;
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info->gproperty = HB_BUFFER_GLYPH_PROPERTIES_UNKNOWN;
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buffer->in_pos++;
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buffer->out_pos++;
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buffer->out_length = buffer->out_pos;
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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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buffer->in_pos++;
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return;
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}
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if (buffer->out_string != buffer->in_string)
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{
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hb_buffer_ensure (buffer, buffer->out_pos + 1);
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buffer->out_string[buffer->out_pos] = buffer->in_string[buffer->in_pos];
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}
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else if (buffer->out_pos != buffer->in_pos)
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buffer->out_string[buffer->out_pos] = buffer->in_string[buffer->in_pos];
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buffer->in_pos++;
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buffer->out_pos++;
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buffer->out_length = buffer->out_pos;
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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_buffer_add_output_glyph (buffer, glyph_index, 0xFFFF, 0xFFFF);
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}
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unsigned short
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_hb_buffer_allocate_lig_id (hb_buffer_t *buffer)
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{
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return ++buffer->max_lig_id;
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}
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unsigned int
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hb_buffer_get_len (hb_buffer_t *buffer)
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{
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return buffer->in_length;
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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->in_string;
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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_output || (buffer->in_length && !buffer->positions))
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hb_buffer_clear_positions (buffer);
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return (hb_glyph_position_t *) buffer->positions;
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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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unsigned int i, j;
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for (i = 0, j = buffer->in_length - 1; i < buffer->in_length / 2; i++, j--) {
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hb_internal_glyph_info_t t;
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t = buffer->in_string[i];
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buffer->in_string[i] = buffer->in_string[j];
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buffer->in_string[j] = t;
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}
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if (buffer->positions) {
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for (i = 0, j = buffer->in_length - 1; i < buffer->in_length / 2; i++, j--) {
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hb_internal_glyph_position_t t;
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t = buffer->positions[i];
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buffer->positions[i] = buffer->positions[j];
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buffer->positions[j] = t;
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}
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}
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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, 0, 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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UTF8_COMPUTE (c, mask, len);
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if (HB_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;
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for (i = 1; i < len; i++)
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{
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if (HB_UNLIKELY ((text[i] & 0xc0) != 0x80))
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{
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*unicode = -1;
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return text + 1;
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}
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result <<= 6;
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result |= (text[i] & 0x3f);
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}
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*unicode = result;
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return text + len;
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}
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}
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void
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hb_buffer_add_utf8 (hb_buffer_t *buffer,
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const char *text,
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unsigned int text_length,
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unsigned int item_offset,
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unsigned int item_length)
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{
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#define UTF_NEXT(S, E, U) hb_utf8_next (S, E, &(U))
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ADD_UTF (uint8_t);
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#undef UTF_NEXT
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}
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static inline const uint16_t *
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hb_utf16_next (const uint16_t *text,
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const uint16_t *end,
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hb_codepoint_t *unicode)
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{
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uint16_t c = *text++;
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if (HB_UNLIKELY (c >= 0xd800 && c < 0xdc00)) {
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/* high surrogate */
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uint16_t l;
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if (text < end && ((l = *text), HB_UNLIKELY (l >= 0xdc00 && l < 0xe000))) {
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/* low surrogate */
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*unicode = ((hb_codepoint_t) ((c) - 0xd800) * 0x400 + (l) - 0xdc00 + 0x10000);
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text++;
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} else
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*unicode = -1;
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} else
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*unicode = c;
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return text;
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}
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void
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hb_buffer_add_utf16 (hb_buffer_t *buffer,
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const uint16_t *text,
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unsigned int text_length,
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unsigned int item_offset,
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unsigned int item_length)
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{
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#define UTF_NEXT(S, E, U) hb_utf16_next (S, E, &(U))
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ADD_UTF (uint16_t);
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#undef UTF_NEXT
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}
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void
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hb_buffer_add_utf32 (hb_buffer_t *buffer,
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const uint32_t *text,
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unsigned int text_length,
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unsigned int item_offset,
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unsigned int item_length)
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{
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#define UTF_NEXT(S, E, U) ((U) = *(S), (S)+1)
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ADD_UTF (uint32_t);
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#undef UTF_NEXT
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}
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