diff options
Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-post-table-v2subset.hh')
| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-post-table-v2subset.hh | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-post-table-v2subset.hh b/gfx/harfbuzz/src/hb-ot-post-table-v2subset.hh new file mode 100644 index 0000000000..d44233610a --- /dev/null +++ b/gfx/harfbuzz/src/hb-ot-post-table-v2subset.hh @@ -0,0 +1,142 @@ +/* + * Copyright © 2021 Google, Inc. + * + * This is part of HarfBuzz, a text shaping library. + * + * Permission is hereby granted, without written agreement and without + * license or royalty fees, to use, copy, modify, and distribute this + * software and its documentation for any purpose, provided that the + * above copyright notice and the following two paragraphs appear in + * all copies of this software. + * + * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN + * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + * + * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS + * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. + * + */ + +#ifndef HB_OT_POST_TABLE_V2SUBSET_HH +#define HB_OT_POST_TABLE_V2SUBSET_HH + +#include "hb-open-type.hh" +#include "hb-ot-post-table.hh" + +/* + * post -- PostScript + * https://docs.microsoft.com/en-us/typography/opentype/spec/post + */ + +namespace OT { +template<typename Iterator> +HB_INTERNAL bool postV2Tail::serialize (hb_serialize_context_t *c, + Iterator it, + const void* _post) const +{ + TRACE_SERIALIZE (this); + auto *out = c->start_embed (this); + if (unlikely (!c->check_success (out))) return_trace (false); + if (!out->glyphNameIndex.serialize (c, + it + | hb_map (hb_second))) + return_trace (false); + + hb_set_t copied_indices; + for (const auto& _ : + it ) + { + unsigned glyph_id = _.first; + unsigned new_index = _.second; + + if (new_index < 258) continue; + if (copied_indices.has (new_index)) continue; + copied_indices.add (new_index); + + hb_bytes_t s = reinterpret_cast<const post::accelerator_t*> (_post)->find_glyph_name (glyph_id); + HBUINT8 *o = c->allocate_size<HBUINT8> (HBUINT8::static_size * (s.length + 1)); + if (unlikely (!o)) return_trace (false); + if (!c->check_assign (o[0], s.length, HB_SERIALIZE_ERROR_INT_OVERFLOW)) return_trace (false); + hb_memcpy (o+1, s.arrayZ, HBUINT8::static_size * s.length); + } + + return_trace (true); +} + +HB_INTERNAL bool postV2Tail::subset (hb_subset_context_t *c) const +{ + TRACE_SUBSET (this); + + const hb_map_t &reverse_glyph_map = *c->plan->reverse_glyph_map; + unsigned num_glyphs = c->plan->num_output_glyphs (); + hb_map_t old_new_index_map, old_gid_new_index_map; + unsigned i = 0; + + post::accelerator_t _post (c->plan->source); + + hb_hashmap_t<hb_bytes_t, uint32_t, true> glyph_name_to_new_index; + + old_new_index_map.alloc (num_glyphs); + old_gid_new_index_map.alloc (num_glyphs); + glyph_name_to_new_index.alloc (num_glyphs); + + for (hb_codepoint_t new_gid = 0; new_gid < num_glyphs; new_gid++) + { + hb_codepoint_t old_gid = reverse_glyph_map.get (new_gid); + unsigned old_index = glyphNameIndex[old_gid]; + + unsigned new_index; + const uint32_t *new_index2; + if (old_index <= 257) + new_index = old_index; + else if (old_new_index_map.has (old_index, &new_index2)) + new_index = *new_index2; + else + { + hb_bytes_t s = _post.find_glyph_name (old_gid); + new_index = glyph_name_to_new_index.get (s); + if (new_index == (unsigned)-1) + { + int standard_glyph_index = -1; + for (unsigned i = 0; i < format1_names_length; i++) + { + if (s == format1_names (i)) + { + standard_glyph_index = i; + break; + } + } + + if (standard_glyph_index == -1) + { + new_index = 258 + i; + i++; + } + else + { new_index = standard_glyph_index; } + glyph_name_to_new_index.set (s, new_index); + } + old_new_index_map.set (old_index, new_index); + } + old_gid_new_index_map.set (old_gid, new_index); + } + + auto index_iter = + + hb_range (num_glyphs) + | hb_map (reverse_glyph_map) + | hb_map_retains_sorting ([&](hb_codepoint_t old_gid) + { + unsigned new_index = old_gid_new_index_map.get (old_gid); + return hb_pair_t<unsigned, unsigned> (old_gid, new_index); + }) + ; + + return_trace (serialize (c->serializer, index_iter, &_post)); +} + +} /* namespace OT */ +#endif /* HB_OT_POST_TABLE_V2SUBSET_HH */ |