372 lines
10 KiB
C++
372 lines
10 KiB
C++
/*
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* Copyright © 2018 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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* Google Author(s): Garret Rieger, Rod Sheeter, Behdad Esfahbod
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*/
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#include "hb-object-private.hh"
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#include "hb-open-type-private.hh"
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#include "hb-private.hh"
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#include "hb-subset-glyf.hh"
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#include "hb-subset-private.hh"
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#include "hb-subset-plan.hh"
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#include "hb-open-file-private.hh"
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#include "hb-ot-cmap-table.hh"
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#include "hb-ot-glyf-table.hh"
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#include "hb-ot-head-table.hh"
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#include "hb-ot-hhea-table.hh"
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#include "hb-ot-hmtx-table.hh"
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#include "hb-ot-maxp-table.hh"
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#include "hb-ot-os2-table.hh"
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#ifndef HB_NO_VISIBILITY
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const void * const OT::_hb_NullPool[HB_NULL_POOL_SIZE / sizeof (void *)] = {};
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#endif
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struct hb_subset_profile_t {
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hb_object_header_t header;
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ASSERT_POD ();
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};
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/**
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* hb_subset_profile_create:
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*
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* Return value: New profile with default settings.
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*
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* Since: 1.8.0
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**/
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hb_subset_profile_t *
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hb_subset_profile_create ()
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{
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return hb_object_create<hb_subset_profile_t>();
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}
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/**
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* hb_subset_profile_destroy:
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*
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* Since: 1.8.0
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**/
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void
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hb_subset_profile_destroy (hb_subset_profile_t *profile)
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{
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if (!hb_object_destroy (profile)) return;
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free (profile);
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}
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template<typename TableType>
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static bool
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_subset (hb_subset_plan_t *plan)
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{
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OT::Sanitizer<TableType> sanitizer;
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hb_blob_t *source_blob = sanitizer.sanitize (plan->source->reference_table (TableType::tableTag));
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const TableType *table = OT::Sanitizer<TableType>::lock_instance (source_blob);
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hb_bool_t result = table->subset(plan);
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hb_blob_destroy (source_blob);
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hb_tag_t tag = TableType::tableTag;
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DEBUG_MSG(SUBSET, nullptr, "OT::%c%c%c%c::subset %s", HB_UNTAG(tag), result ? "success" : "FAILED!");
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return result;
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}
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/*
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* A face that has add_table().
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*/
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struct hb_subset_face_data_t
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{
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struct table_entry_t
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{
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inline int cmp (const hb_tag_t *t) const
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{
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if (*t < tag) return -1;
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if (*t > tag) return -1;
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return 0;
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}
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hb_tag_t tag;
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hb_blob_t *blob;
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};
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hb_prealloced_array_t<table_entry_t, 32> tables;
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};
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static hb_subset_face_data_t *
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_hb_subset_face_data_create (void)
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{
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hb_subset_face_data_t *data = (hb_subset_face_data_t *) calloc (1, sizeof (hb_subset_face_data_t));
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if (unlikely (!data))
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return nullptr;
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return data;
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}
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static void
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_hb_subset_face_data_destroy (void *user_data)
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{
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hb_subset_face_data_t *data = (hb_subset_face_data_t *) user_data;
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data->tables.finish ();
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free (data);
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}
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static hb_blob_t *
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_hb_subset_face_data_reference_blob (hb_subset_face_data_t *data)
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{
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unsigned int table_count = data->tables.len;
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unsigned int face_length = table_count * 16 + 12;
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for (unsigned int i = 0; i < table_count; i++)
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face_length += _hb_ceil_to_4 (hb_blob_get_length (data->tables.array[i].blob));
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char *buf = (char *) malloc (face_length);
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if (unlikely (!buf))
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return nullptr;
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OT::hb_serialize_context_t c (buf, face_length);
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OT::OpenTypeFontFile *f = c.start_serialize<OT::OpenTypeFontFile> ();
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bool is_cff = data->tables.lsearch (HB_TAG ('C','F','F',' ')) || data->tables.lsearch (HB_TAG ('C','F','F','2'));
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hb_tag_t sfnt_tag = is_cff ? OT::OpenTypeFontFile::CFFTag : OT::OpenTypeFontFile::TrueTypeTag;
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OT::Supplier<hb_tag_t> tags_supplier (&data->tables[0].tag, table_count, sizeof (data->tables[0]));
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OT::Supplier<hb_blob_t *> blobs_supplier (&data->tables[0].blob, table_count, sizeof (data->tables[0]));
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bool ret = f->serialize_single (&c,
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sfnt_tag,
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tags_supplier,
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blobs_supplier,
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table_count);
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c.end_serialize ();
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if (unlikely (!ret))
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{
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free (buf);
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return nullptr;
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}
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return hb_blob_create (buf, face_length, HB_MEMORY_MODE_WRITABLE, buf, free);
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}
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static hb_blob_t *
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_hb_subset_face_reference_table (hb_face_t *face, hb_tag_t tag, void *user_data)
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{
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hb_subset_face_data_t *data = (hb_subset_face_data_t *) user_data;
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if (!tag)
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return _hb_subset_face_data_reference_blob (data);
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hb_subset_face_data_t::table_entry_t *entry = data->tables.lsearch (tag);
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if (entry)
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return hb_blob_reference (entry->blob);
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return nullptr;
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}
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hb_face_t *
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hb_subset_face_create (void)
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{
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hb_subset_face_data_t *data = _hb_subset_face_data_create ();
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if (unlikely (!data)) return hb_face_get_empty ();
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return hb_face_create_for_tables (_hb_subset_face_reference_table,
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data,
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_hb_subset_face_data_destroy);
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}
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hb_bool_t
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hb_subset_face_add_table (hb_face_t *face, hb_tag_t tag, hb_blob_t *blob)
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{
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if (unlikely (face->destroy != _hb_subset_face_data_destroy))
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return false;
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hb_subset_face_data_t *data = (hb_subset_face_data_t *) face->user_data;
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hb_subset_face_data_t::table_entry_t *entry = data->tables.push ();
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if (unlikely (!entry))
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return false;
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entry->tag = tag;
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entry->blob = hb_blob_reference (blob);
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return true;
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}
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static bool
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_add_head_and_set_loca_version (hb_face_t *source, bool use_short_loca, hb_face_t *dest)
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{
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hb_blob_t *head_blob = OT::Sanitizer<OT::head>().sanitize (hb_face_reference_table (source, HB_OT_TAG_head));
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const OT::head *head = OT::Sanitizer<OT::head>::lock_instance (head_blob);
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hb_bool_t has_head = (head != nullptr);
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if (has_head) {
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OT::head *head_prime = (OT::head *) malloc (OT::head::static_size);
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memcpy (head_prime, head, OT::head::static_size);
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head_prime->indexToLocFormat.set (use_short_loca ? 0 : 1);
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hb_blob_t *head_prime_blob = hb_blob_create ((const char*) head_prime,
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OT::head::static_size,
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HB_MEMORY_MODE_READONLY,
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head_prime,
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free);
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has_head = hb_subset_face_add_table (dest, HB_OT_TAG_head, head_prime_blob);
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hb_blob_destroy (head_prime_blob);
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}
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hb_blob_destroy (head_blob);
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return has_head;
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}
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static bool
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_subset_glyf (hb_subset_plan_t *plan)
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{
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hb_blob_t *glyf_prime = nullptr;
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hb_blob_t *loca_prime = nullptr;
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bool success = true;
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bool use_short_loca = false;
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// TODO(grieger): Migrate to subset function on the table like cmap.
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if (hb_subset_glyf_and_loca (plan, &use_short_loca, &glyf_prime, &loca_prime)) {
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success = success && hb_subset_plan_add_table (plan, HB_OT_TAG_glyf, glyf_prime);
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success = success && hb_subset_plan_add_table (plan, HB_OT_TAG_loca, loca_prime);
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success = success && _add_head_and_set_loca_version (plan->source, use_short_loca, plan->dest);
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} else {
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success = false;
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}
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hb_blob_destroy (loca_prime);
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hb_blob_destroy (glyf_prime);
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return success;
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}
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static bool
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_subset_table (hb_subset_plan_t *plan,
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hb_tag_t tag)
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{
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// TODO (grieger): Handle updating the head table (loca format + num glyphs)
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DEBUG_MSG(SUBSET, nullptr, "begin subset %c%c%c%c", HB_UNTAG(tag));
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bool result = true;
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switch (tag) {
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case HB_OT_TAG_glyf:
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result = _subset_glyf (plan);
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break;
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case HB_OT_TAG_head:
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// SKIP head, it's handled by glyf
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result = true;
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break;
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case HB_OT_TAG_hhea:
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// SKIP hhea, it's handled by hmtx
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return true;
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case HB_OT_TAG_hmtx:
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result = _subset<const OT::hmtx> (plan);
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break;
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case HB_OT_TAG_maxp:
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result = _subset<const OT::maxp> (plan);
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break;
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case HB_OT_TAG_loca:
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// SKIP loca, it's handle by glyf
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return true;
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case HB_OT_TAG_cmap:
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result = _subset<const OT::cmap> (plan);
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break;
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case HB_OT_TAG_os2:
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result = _subset<const OT::os2> (plan);
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break;
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default:
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hb_blob_t *source_table = hb_face_reference_table(plan->source, tag);
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if (likely(source_table))
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{
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result = hb_subset_plan_add_table(plan, tag, source_table);
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}
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else
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{
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result = false;
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}
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break;
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}
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DEBUG_MSG(SUBSET, nullptr, "subset %c%c%c%c %s", HB_UNTAG(tag), result ? "ok" : "FAILED");
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return true;
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}
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static bool
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_should_drop_table(hb_tag_t tag)
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{
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switch (tag) {
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case HB_TAG ('G', 'D', 'E', 'F'): /* temporary */
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case HB_TAG ('G', 'P', 'O', 'S'): /* temporary */
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case HB_TAG ('G', 'S', 'U', 'B'): /* temporary */
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case HB_TAG ('D', 'S', 'I', 'G'):
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return true;
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default:
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return false;
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}
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}
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/**
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* hb_subset:
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* @source: font face data to be subset.
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* @profile: profile to use for the subsetting.
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* @input: input to use for the subsetting.
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*
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* Subsets a font according to provided profile and input.
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**/
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hb_face_t *
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hb_subset (hb_face_t *source,
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hb_subset_profile_t *profile,
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hb_subset_input_t *input)
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{
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if (unlikely (!profile || !input || !source)) return hb_face_get_empty();
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hb_subset_plan_t *plan = hb_subset_plan_create (source, profile, input);
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hb_tag_t table_tags[32];
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unsigned int offset = 0, count;
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bool success = true;
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do {
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count = ARRAY_LENGTH (table_tags);
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hb_face_get_table_tags (source, offset, &count, table_tags);
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for (unsigned int i = 0; i < count; i++)
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{
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hb_tag_t tag = table_tags[i];
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if (_should_drop_table(tag))
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{
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DEBUG_MSG(SUBSET, nullptr, "drop %c%c%c%c", HB_UNTAG(tag));
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continue;
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}
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success = success && _subset_table (plan, tag);
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}
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} while (count == ARRAY_LENGTH (table_tags));
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hb_face_t *result = success ? hb_face_reference(plan->dest) : hb_face_get_empty();
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hb_subset_plan_destroy (plan);
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return result;
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}
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