389 lines
11 KiB
C++
389 lines
11 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-private.hh"
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#include "hb-open-type-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-hdmx-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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#include "hb-ot-post-table.hh"
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#include "hb-ot-cff-table.hh"
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#include "hb-ot-cff2-table.hh"
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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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hb_blob_t *source_blob = hb_sanitize_context_t ().reference_table<TableType> (plan->source);
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const TableType *table = source_blob->as<TableType> ();
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hb_tag_t tag = TableType::tableTag;
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hb_bool_t result = false;
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if (source_blob->data)
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{
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result = table->subset(plan);
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} else {
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DEBUG_MSG(SUBSET, nullptr, "OT::%c%c%c%c::subset sanitize failed on source table.", HB_UNTAG(tag));
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}
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hb_blob_destroy (source_blob);
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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_vector_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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data->tables.init ();
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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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for (unsigned int i = 0; i < data->tables.len; i++)
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hb_blob_destroy (data->tables[i].blob);
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data->tables.fini ();
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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.arrayZ[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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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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Supplier<hb_tag_t> tags_supplier (&data->tables[0].tag, table_count, sizeof (data->tables[0]));
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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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/* TODO: Move this to hb-face.h and rename to hb_face_builder_create()
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* with hb_face_builder_add_table(). */
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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_destroy_func_t) _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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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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_subset_table (hb_subset_plan_t *plan,
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hb_tag_t tag)
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{
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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<const OT::glyf> (plan);
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break;
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case HB_OT_TAG_hdmx:
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result = _subset<const OT::hdmx> (plan);
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break;
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case HB_OT_TAG_head:
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// TODO that won't work well if there is no glyf
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DEBUG_MSG(SUBSET, nullptr, "skip head, 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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DEBUG_MSG(SUBSET, nullptr, "skip hhea 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_vhea:
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DEBUG_MSG(SUBSET, nullptr, "skip vhea handled by vmtx");
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return true;
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case HB_OT_TAG_vmtx:
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result = _subset<const OT::vmtx> (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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DEBUG_MSG(SUBSET, nullptr, "skip loca handled 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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case HB_OT_TAG_post:
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result = _subset<const OT::post> (plan);
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break;
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case HB_OT_TAG_cff:
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result = _subset<const OT::cff> (plan);
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break;
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case HB_OT_TAG_cff2:
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result = _subset<const OT::cff2> (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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result = plan->add_table(tag, source_table);
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else
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result = false;
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hb_blob_destroy (source_table);
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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 result;
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}
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static bool
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_should_drop_table(hb_subset_plan_t *plan, hb_tag_t tag)
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{
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switch (tag) {
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case HB_TAG ('c', 'v', 'a', 'r'): /* hint table, fallthrough */
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case HB_TAG ('c', 'v', 't', ' '): /* hint table, fallthrough */
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case HB_TAG ('f', 'p', 'g', 'm'): /* hint table, fallthrough */
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case HB_TAG ('p', 'r', 'e', 'p'): /* hint table, fallthrough */
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case HB_TAG ('h', 'd', 'm', 'x'): /* hint table, fallthrough */
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case HB_TAG ('V', 'D', 'M', 'X'): /* hint table, fallthrough */
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return plan->drop_hints;
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// Drop Layout Tables if requested.
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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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return plan->drop_ot_layout;
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// Drop these tables below by default, list pulled
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// from fontTools:
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case HB_TAG ('B', 'A', 'S', 'E'):
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case HB_TAG ('J', 'S', 'T', 'F'):
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case HB_TAG ('D', 'S', 'I', 'G'):
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case HB_TAG ('E', 'B', 'D', 'T'):
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case HB_TAG ('E', 'B', 'L', 'C'):
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case HB_TAG ('E', 'B', 'S', 'C'):
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case HB_TAG ('S', 'V', 'G', ' '):
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case HB_TAG ('P', 'C', 'L', 'T'):
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case HB_TAG ('L', 'T', 'S', 'H'):
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// Graphite tables:
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case HB_TAG ('F', 'e', 'a', 't'):
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case HB_TAG ('G', 'l', 'a', 't'):
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case HB_TAG ('G', 'l', 'o', 'c'):
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case HB_TAG ('S', 'i', 'l', 'f'):
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case HB_TAG ('S', 'i', 'l', 'l'):
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// Colour
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case HB_TAG ('s', 'b', 'i', 'x'):
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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(plan, 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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offset += count;
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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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/**
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* hb_subset_get_all_codepoints:
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* @source: font face data to load.
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* @out: set to add the all codepoints covered by font face, source.
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*/
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void
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hb_subset_get_all_codepoints (hb_face_t *source, hb_set_t *out)
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{
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OT::cmap::accelerator_t cmap;
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cmap.init (source);
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cmap.get_all_codepoints (out);
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cmap.fini();
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}
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