135 lines
4.4 KiB
C++
135 lines
4.4 KiB
C++
/*
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* Copyright © 2021 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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*/
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#ifndef HB_OT_POST_TABLE_V2SUBSET_HH
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#define HB_OT_POST_TABLE_V2SUBSET_HH
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#include "hb-open-type.hh"
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#include "hb-ot-post-table.hh"
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/*
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* post -- PostScript
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* https://docs.microsoft.com/en-us/typography/opentype/spec/post
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*/
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namespace OT {
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template<typename Iterator>
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HB_INTERNAL bool postV2Tail::serialize (hb_serialize_context_t *c,
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Iterator it,
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const void* _post) const
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{
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TRACE_SERIALIZE (this);
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auto *out = c->start_embed (this);
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if (unlikely (!c->check_success (out))) return_trace (false);
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if (!out->glyphNameIndex.serialize (c, + it
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| hb_map (hb_second)))
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return_trace (false);
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hb_set_t copied_indices;
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for (const auto& _ : + it )
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{
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unsigned glyph_id = _.first;
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unsigned new_index = _.second;
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if (new_index < 258) continue;
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if (copied_indices.has (new_index)) continue;
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copied_indices.add (new_index);
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hb_bytes_t s = reinterpret_cast<const post::accelerator_t*> (_post)->find_glyph_name (glyph_id);
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HBUINT8 *o = c->allocate_size<HBUINT8> (HBUINT8::static_size * (s.length + 1));
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if (unlikely (!o)) return_trace (false);
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if (!c->check_assign (o[0], s.length, HB_SERIALIZE_ERROR_INT_OVERFLOW)) return_trace (false);
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memcpy (o+1, s.arrayZ, HBUINT8::static_size * s.length);
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}
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return_trace (true);
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}
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HB_INTERNAL bool postV2Tail::subset (hb_subset_context_t *c) const
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{
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TRACE_SUBSET (this);
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const hb_map_t &reverse_glyph_map = *c->plan->reverse_glyph_map;
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unsigned num_glyphs = c->plan->num_output_glyphs ();
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hb_map_t old_new_index_map, old_gid_new_index_map;
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unsigned i = 0;
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post::accelerator_t _post (c->plan->source);
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hb_hashmap_t<hb_bytes_t, unsigned, std::nullptr_t, unsigned, nullptr, (unsigned)-1> glyph_name_to_new_index;
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for (hb_codepoint_t new_gid = 0; new_gid < num_glyphs; new_gid++)
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{
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hb_codepoint_t old_gid = reverse_glyph_map.get (new_gid);
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unsigned old_index = glyphNameIndex[old_gid];
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unsigned new_index;
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if (old_index <= 257) new_index = old_index;
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else if (old_new_index_map.has (old_index)) new_index = old_new_index_map.get (old_index);
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else
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{
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hb_bytes_t s = _post.find_glyph_name (old_gid);
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new_index = glyph_name_to_new_index.get (s);
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if (new_index == (unsigned)-1)
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{
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int standard_glyph_index = -1;
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for (unsigned i = 0; i < format1_names_length; i++)
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{
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if (s == format1_names (i))
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{
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standard_glyph_index = i;
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break;
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}
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}
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if (standard_glyph_index == -1)
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{
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new_index = 258 + i;
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i++;
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}
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else
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{ new_index = standard_glyph_index; }
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glyph_name_to_new_index.set (s, new_index);
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}
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old_new_index_map.set (old_index, new_index);
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}
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old_gid_new_index_map.set (old_gid, new_index);
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}
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auto index_iter =
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+ hb_range (num_glyphs)
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| hb_map (reverse_glyph_map)
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| hb_map_retains_sorting ([&](hb_codepoint_t old_gid)
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{
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unsigned new_index = old_gid_new_index_map.get (old_gid);
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return hb_pair_t<unsigned, unsigned> (old_gid, new_index);
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})
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;
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return_trace (serialize (c->serializer, index_iter, &_post));
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}
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} /* namespace OT */
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#endif /* HB_OT_POST_TABLE_V2SUBSET_HH */
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