835 lines
18 KiB
C++
835 lines
18 KiB
C++
/*
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* Copyright © 1998-2004 David Turner and Werner Lemberg
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* Copyright © 2004,2007,2009,2010 Red Hat, Inc.
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* Copyright © 2011 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Owen Taylor, Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#include "hb-buffer-private.hh"
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#include <string.h>
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#ifndef HB_DEBUG_BUFFER
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#define HB_DEBUG_BUFFER (HB_DEBUG+0)
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#endif
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static hb_buffer_t _hb_buffer_nil = {
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HB_OBJECT_HEADER_STATIC,
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&_hb_unicode_funcs_default,
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{
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HB_DIRECTION_INVALID,
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HB_SCRIPT_INVALID,
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NULL,
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},
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TRUE, /* in_error */
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TRUE, /* have_output */
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TRUE /* have_positions */
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};
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/* Here is how the buffer works internally:
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*
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* There are two info pointers: info and out_info. They always have
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* the same allocated size, but different lengths.
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*
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* As an optimization, both info and out_info may point to the
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* same piece of memory, which is owned by info. This remains the
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* case as long as out_len doesn't exceed i at any time.
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* In that case, swap_buffers() is no-op and the glyph operations operate
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* mostly in-place.
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*
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* As soon as out_info gets longer than info, out_info is moved over
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* to an alternate buffer (which we reuse the pos buffer for!), and its
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* current contents (out_len entries) are copied to the new place.
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* This should all remain transparent to the user. swap_buffers() then
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* switches info and out_info.
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*/
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/* Internal API */
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bool
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hb_buffer_t::enlarge (unsigned int size)
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{
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if (unlikely (in_error))
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return FALSE;
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unsigned int new_allocated = allocated;
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hb_glyph_position_t *new_pos = NULL;
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hb_glyph_info_t *new_info = NULL;
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bool separate_out = out_info != info;
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if (unlikely (_hb_unsigned_int_mul_overflows (size, sizeof (info[0]))))
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goto done;
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while (size > new_allocated)
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new_allocated += (new_allocated >> 1) + 32;
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ASSERT_STATIC (sizeof (info[0]) == sizeof (pos[0]));
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if (unlikely (_hb_unsigned_int_mul_overflows (new_allocated, sizeof (info[0]))))
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goto done;
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new_pos = (hb_glyph_position_t *) realloc (pos, new_allocated * sizeof (pos[0]));
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new_info = (hb_glyph_info_t *) realloc (info, new_allocated * sizeof (info[0]));
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done:
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if (unlikely (!new_pos || !new_info))
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in_error = TRUE;
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if (likely (new_pos))
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pos = new_pos;
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if (likely (new_info))
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info = new_info;
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out_info = separate_out ? (hb_glyph_info_t *) pos : info;
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if (likely (!in_error))
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allocated = new_allocated;
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return likely (!in_error);
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}
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bool
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hb_buffer_t::make_room_for (unsigned int num_in,
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unsigned int num_out)
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{
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if (unlikely (!ensure (out_len + num_out))) return FALSE;
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if (out_info == info &&
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out_len + num_out > idx + num_in)
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{
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assert (have_output);
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out_info = (hb_glyph_info_t *) pos;
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memcpy (out_info, info, out_len * sizeof (out_info[0]));
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}
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return TRUE;
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}
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void *
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hb_buffer_t::get_scratch_buffer (unsigned int *size)
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{
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have_output = FALSE;
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have_positions = FALSE;
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out_len = 0;
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*size = allocated * sizeof (pos[0]);
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return pos;
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}
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/* HarfBuzz-Internal API */
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void
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hb_buffer_t::reset (void)
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{
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if (unlikely (hb_object_is_inert (this)))
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return;
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hb_unicode_funcs_destroy (unicode);
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unicode = _hb_buffer_nil.unicode;
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props = _hb_buffer_nil.props;
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in_error = FALSE;
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have_output = FALSE;
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have_positions = FALSE;
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idx = 0;
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len = 0;
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out_len = 0;
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serial = 0;
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memset (allocated_var_bytes, 0, sizeof allocated_var_bytes);
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memset (allocated_var_owner, 0, sizeof allocated_var_owner);
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out_info = info;
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}
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void
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hb_buffer_t::add (hb_codepoint_t codepoint,
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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 (!ensure (len + 1))) return;
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glyph = &info[len];
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memset (glyph, 0, sizeof (*glyph));
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glyph->codepoint = codepoint;
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glyph->mask = mask;
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glyph->cluster = cluster;
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len++;
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}
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void
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hb_buffer_t::clear_output (void)
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{
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if (unlikely (hb_object_is_inert (this)))
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return;
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have_output = TRUE;
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have_positions = FALSE;
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out_len = 0;
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out_info = info;
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}
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void
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hb_buffer_t::clear_positions (void)
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{
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if (unlikely (hb_object_is_inert (this)))
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return;
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have_output = FALSE;
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have_positions = TRUE;
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memset (pos, 0, sizeof (pos[0]) * len);
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}
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void
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hb_buffer_t::swap_buffers (void)
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{
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if (unlikely (in_error)) return;
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assert (have_output);
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if (out_info != info)
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{
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hb_glyph_info_t *tmp_string;
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tmp_string = info;
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info = out_info;
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out_info = tmp_string;
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pos = (hb_glyph_position_t *) out_info;
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}
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unsigned int tmp;
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tmp = len;
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len = out_len;
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out_len = tmp;
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idx = 0;
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}
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void
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hb_buffer_t::replace_glyphs_be16 (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 (!make_room_for (num_in, num_out)) return;
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hb_glyph_info_t orig_info = info[idx];
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for (unsigned int i = 1; i < num_in; i++)
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{
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hb_glyph_info_t *inf = &info[idx + i];
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orig_info.cluster = MIN (orig_info.cluster, inf->cluster);
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}
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hb_glyph_info_t *pinfo = &out_info[out_len];
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for (unsigned int i = 0; i < num_out; i++)
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{
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*pinfo = orig_info;
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pinfo->codepoint = hb_be_uint16 (glyph_data_be[i]);
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pinfo++;
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}
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idx += num_in;
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out_len += num_out;
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}
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void
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hb_buffer_t::output_glyph (hb_codepoint_t glyph_index)
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{
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if (!make_room_for (0, 1)) return;
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out_info[out_len] = info[idx];
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out_info[out_len].codepoint = glyph_index;
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out_len++;
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}
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void
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hb_buffer_t::copy_glyph (void)
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{
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if (!make_room_for (0, 1)) return;
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out_info[out_len] = info[idx];
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out_len++;
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}
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void
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hb_buffer_t::replace_glyph (hb_codepoint_t glyph_index)
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{
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out_info[out_len] = info[idx];
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out_info[out_len].codepoint = glyph_index;
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idx++;
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out_len++;
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}
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void
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hb_buffer_t::next_glyph (void)
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{
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if (have_output)
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{
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if (out_info != info)
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{
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if (unlikely (!ensure (out_len + 1))) return;
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out_info[out_len] = info[idx];
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}
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else if (out_len != idx)
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out_info[out_len] = info[idx];
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out_len++;
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}
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idx++;
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}
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void
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hb_buffer_t::set_masks (hb_mask_t value,
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hb_mask_t mask,
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unsigned int cluster_start,
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unsigned int cluster_end)
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{
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hb_mask_t not_mask = ~mask;
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value &= mask;
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if (!mask)
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return;
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if (cluster_start == 0 && cluster_end == (unsigned int)-1) {
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unsigned int count = len;
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for (unsigned int i = 0; i < count; i++)
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info[i].mask = (info[i].mask & not_mask) | value;
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return;
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}
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unsigned int count = len;
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for (unsigned int i = 0; i < count; i++)
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if (cluster_start <= info[i].cluster && info[i].cluster < cluster_end)
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info[i].mask = (info[i].mask & not_mask) | value;
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}
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void
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hb_buffer_t::reverse_range (unsigned int start,
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unsigned int end)
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{
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unsigned int i, j;
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if (start == end - 1)
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return;
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for (i = start, j = end - 1; i < j; i++, j--) {
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hb_glyph_info_t t;
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t = info[i];
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info[i] = info[j];
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info[j] = t;
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}
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if (pos) {
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for (i = start, j = end - 1; i < j; i++, j--) {
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hb_glyph_position_t t;
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t = pos[i];
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pos[i] = pos[j];
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pos[j] = t;
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}
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}
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}
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void
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hb_buffer_t::reverse (void)
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{
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if (unlikely (!len))
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return;
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reverse_range (0, len);
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}
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void
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hb_buffer_t::reverse_clusters (void)
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{
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unsigned int i, start, count, last_cluster;
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if (unlikely (!len))
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return;
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reverse ();
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count = len;
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start = 0;
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last_cluster = info[0].cluster;
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for (i = 1; i < count; i++) {
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if (last_cluster != info[i].cluster) {
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reverse_range (start, i);
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start = i;
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last_cluster = info[i].cluster;
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}
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}
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reverse_range (start, i);
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}
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void
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hb_buffer_t::guess_properties (void)
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{
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/* If script is set to INVALID, guess from buffer contents */
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if (props.script == HB_SCRIPT_INVALID) {
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for (unsigned int i = 0; i < len; i++) {
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hb_script_t script = hb_unicode_script (unicode, info[i].codepoint);
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if (likely (script != HB_SCRIPT_COMMON &&
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script != HB_SCRIPT_INHERITED &&
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script != HB_SCRIPT_UNKNOWN)) {
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props.script = script;
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break;
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}
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}
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}
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/* If direction is set to INVALID, guess from script */
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if (props.direction == HB_DIRECTION_INVALID) {
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props.direction = hb_script_get_horizontal_direction (props.script);
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}
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/* If language is not set, use default language from locale */
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if (props.language == HB_LANGUAGE_INVALID) {
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/* TODO get_default_for_script? using $LANGUAGE */
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props.language = hb_language_get_default ();
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}
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}
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static inline void
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dump_var_allocation (const hb_buffer_t *buffer)
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{
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char buf[80];
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for (unsigned int i = 0; i < 8; i++)
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buf[i] = '0' + buffer->allocated_var_bytes[7 - i];
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buf[8] = '\0';
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DEBUG_MSG (BUFFER, buffer,
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"Current var allocation: %s",
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buf);
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}
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void hb_buffer_t::allocate_var (unsigned int byte_i, unsigned int count, const char *owner)
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{
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assert (byte_i < 8 && byte_i + count <= 8);
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if (DEBUG (BUFFER))
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dump_var_allocation (this);
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DEBUG_MSG (BUFFER, this,
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"Allocating var bytes %d..%d for %s",
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byte_i, byte_i + count - 1, owner);
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for (unsigned int i = byte_i; i < byte_i + count; i++) {
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assert (!allocated_var_bytes[i]);
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allocated_var_bytes[i]++;
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allocated_var_owner[i] = owner;
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}
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}
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void hb_buffer_t::deallocate_var (unsigned int byte_i, unsigned int count, const char *owner)
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{
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if (DEBUG (BUFFER))
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dump_var_allocation (this);
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DEBUG_MSG (BUFFER, this,
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"Deallocating var bytes %d..%d for %s",
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byte_i, byte_i + count - 1, owner);
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assert (byte_i < 8 && byte_i + count <= 8);
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for (unsigned int i = byte_i; i < byte_i + count; i++) {
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assert (allocated_var_bytes[i]);
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assert (0 == strcmp (allocated_var_owner[i], owner));
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allocated_var_bytes[i]--;
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}
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}
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void hb_buffer_t::deallocate_var_all (void)
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{
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memset (allocated_var_bytes, 0, sizeof (allocated_var_bytes));
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memset (allocated_var_owner, 0, sizeof (allocated_var_owner));
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}
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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 (!(buffer = hb_object_create<hb_buffer_t> ()))
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return &_hb_buffer_nil;
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buffer->reset ();
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|
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if (pre_alloc_size && !buffer->ensure (pre_alloc_size)) {
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hb_buffer_destroy (buffer);
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return &_hb_buffer_nil;
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}
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|
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return buffer;
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}
|
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|
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hb_buffer_t *
|
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hb_buffer_get_empty (void)
|
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{
|
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return &_hb_buffer_nil;
|
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}
|
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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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return hb_object_reference (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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if (!hb_object_destroy (buffer)) return;
|
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|
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hb_unicode_funcs_destroy (buffer->unicode);
|
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|
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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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|
|
hb_bool_t
|
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hb_buffer_set_user_data (hb_buffer_t *buffer,
|
|
hb_user_data_key_t *key,
|
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void * data,
|
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hb_destroy_func_t destroy)
|
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{
|
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return hb_object_set_user_data (buffer, key, data, destroy);
|
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}
|
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void *
|
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hb_buffer_get_user_data (hb_buffer_t *buffer,
|
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hb_user_data_key_t *key)
|
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{
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return hb_object_get_user_data (buffer, key);
|
|
}
|
|
|
|
|
|
void
|
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hb_buffer_set_unicode_funcs (hb_buffer_t *buffer,
|
|
hb_unicode_funcs_t *unicode)
|
|
{
|
|
if (unlikely (hb_object_is_inert (buffer)))
|
|
return;
|
|
|
|
if (!unicode)
|
|
unicode = _hb_buffer_nil.unicode;
|
|
|
|
hb_unicode_funcs_reference (unicode);
|
|
hb_unicode_funcs_destroy (buffer->unicode);
|
|
buffer->unicode = unicode;
|
|
}
|
|
|
|
hb_unicode_funcs_t *
|
|
hb_buffer_get_unicode_funcs (hb_buffer_t *buffer)
|
|
{
|
|
return buffer->unicode;
|
|
}
|
|
|
|
void
|
|
hb_buffer_set_direction (hb_buffer_t *buffer,
|
|
hb_direction_t direction)
|
|
|
|
{
|
|
if (unlikely (hb_object_is_inert (buffer)))
|
|
return;
|
|
|
|
buffer->props.direction = direction;
|
|
}
|
|
|
|
hb_direction_t
|
|
hb_buffer_get_direction (hb_buffer_t *buffer)
|
|
{
|
|
return buffer->props.direction;
|
|
}
|
|
|
|
void
|
|
hb_buffer_set_script (hb_buffer_t *buffer,
|
|
hb_script_t script)
|
|
{
|
|
if (unlikely (hb_object_is_inert (buffer)))
|
|
return;
|
|
|
|
buffer->props.script = script;
|
|
}
|
|
|
|
hb_script_t
|
|
hb_buffer_get_script (hb_buffer_t *buffer)
|
|
{
|
|
return buffer->props.script;
|
|
}
|
|
|
|
void
|
|
hb_buffer_set_language (hb_buffer_t *buffer,
|
|
hb_language_t language)
|
|
{
|
|
if (unlikely (hb_object_is_inert (buffer)))
|
|
return;
|
|
|
|
buffer->props.language = language;
|
|
}
|
|
|
|
hb_language_t
|
|
hb_buffer_get_language (hb_buffer_t *buffer)
|
|
{
|
|
return buffer->props.language;
|
|
}
|
|
|
|
|
|
void
|
|
hb_buffer_reset (hb_buffer_t *buffer)
|
|
{
|
|
buffer->reset ();
|
|
}
|
|
|
|
hb_bool_t
|
|
hb_buffer_pre_allocate (hb_buffer_t *buffer, unsigned int size)
|
|
{
|
|
return buffer->ensure (size);
|
|
}
|
|
|
|
hb_bool_t
|
|
hb_buffer_allocation_successful (hb_buffer_t *buffer)
|
|
{
|
|
return !buffer->in_error;
|
|
}
|
|
|
|
void
|
|
hb_buffer_add (hb_buffer_t *buffer,
|
|
hb_codepoint_t codepoint,
|
|
hb_mask_t mask,
|
|
unsigned int cluster)
|
|
{
|
|
buffer->add (codepoint, mask, cluster);
|
|
}
|
|
|
|
hb_bool_t
|
|
hb_buffer_set_length (hb_buffer_t *buffer,
|
|
unsigned int length)
|
|
{
|
|
if (!buffer->ensure (length))
|
|
return FALSE;
|
|
|
|
/* Wipe the new space */
|
|
if (length > buffer->len) {
|
|
memset (buffer->info + buffer->len, 0, sizeof (buffer->info[0]) * (length - buffer->len));
|
|
if (buffer->have_positions)
|
|
memset (buffer->pos + buffer->len, 0, sizeof (buffer->pos[0]) * (length - buffer->len));
|
|
}
|
|
|
|
buffer->len = length;
|
|
return TRUE;
|
|
}
|
|
|
|
unsigned int
|
|
hb_buffer_get_length (hb_buffer_t *buffer)
|
|
{
|
|
return buffer->len;
|
|
}
|
|
|
|
/* Return value valid as long as buffer not modified */
|
|
hb_glyph_info_t *
|
|
hb_buffer_get_glyph_infos (hb_buffer_t *buffer,
|
|
unsigned int *length)
|
|
{
|
|
if (length)
|
|
*length = buffer->len;
|
|
|
|
return (hb_glyph_info_t *) buffer->info;
|
|
}
|
|
|
|
/* Return value valid as long as buffer not modified */
|
|
hb_glyph_position_t *
|
|
hb_buffer_get_glyph_positions (hb_buffer_t *buffer,
|
|
unsigned int *length)
|
|
{
|
|
if (!buffer->have_positions)
|
|
buffer->clear_positions ();
|
|
|
|
if (length)
|
|
*length = buffer->len;
|
|
|
|
return (hb_glyph_position_t *) buffer->pos;
|
|
}
|
|
|
|
void
|
|
hb_buffer_reverse (hb_buffer_t *buffer)
|
|
{
|
|
buffer->reverse ();
|
|
}
|
|
|
|
void
|
|
hb_buffer_reverse_clusters (hb_buffer_t *buffer)
|
|
{
|
|
buffer->reverse_clusters ();
|
|
}
|
|
|
|
void
|
|
hb_buffer_guess_properties (hb_buffer_t *buffer)
|
|
{
|
|
buffer->guess_properties ();
|
|
}
|
|
|
|
#define ADD_UTF(T) \
|
|
HB_STMT_START { \
|
|
if (text_length == -1) { \
|
|
text_length = 0; \
|
|
const T *p = (const T *) text; \
|
|
while (*p) { \
|
|
text_length++; \
|
|
p++; \
|
|
} \
|
|
} \
|
|
if (item_length == -1) \
|
|
item_length = text_length - item_offset; \
|
|
const T *next = (const T *) text + item_offset; \
|
|
const T *end = next + item_length; \
|
|
while (next < end) { \
|
|
hb_codepoint_t u; \
|
|
const T *old_next = next; \
|
|
next = UTF_NEXT (next, end, u); \
|
|
hb_buffer_add (buffer, u, 1, old_next - (const T *) text); \
|
|
} \
|
|
} HB_STMT_END
|
|
|
|
|
|
#define UTF8_COMPUTE(Char, Mask, Len) \
|
|
if (Char < 128) { Len = 1; Mask = 0x7f; } \
|
|
else if ((Char & 0xe0) == 0xc0) { Len = 2; Mask = 0x1f; } \
|
|
else if ((Char & 0xf0) == 0xe0) { Len = 3; Mask = 0x0f; } \
|
|
else if ((Char & 0xf8) == 0xf0) { Len = 4; Mask = 0x07; } \
|
|
else Len = 0;
|
|
|
|
static inline const uint8_t *
|
|
hb_utf8_next (const uint8_t *text,
|
|
const uint8_t *end,
|
|
hb_codepoint_t *unicode)
|
|
{
|
|
uint8_t c = *text;
|
|
unsigned int mask, len;
|
|
|
|
/* TODO check for overlong sequences? */
|
|
|
|
UTF8_COMPUTE (c, mask, len);
|
|
if (unlikely (!len || (unsigned int) (end - text) < len)) {
|
|
*unicode = -1;
|
|
return text + 1;
|
|
} else {
|
|
hb_codepoint_t result;
|
|
unsigned int i;
|
|
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), likely (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
|
|
}
|
|
|
|
|