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authorAkira Kakuto <kakuto@fuk.kindai.ac.jp>2018-03-07 22:32:14 +0000
committerAkira Kakuto <kakuto@fuk.kindai.ac.jp>2018-03-07 22:32:14 +0000
commitef9282421b00185a4962b7d22b96e979687258e2 (patch)
treeb6d0d8c700086d3141e228187693a26b102c971f /Build/source/libs/harfbuzz/harfbuzz-src/src/hb-subset.cc
parent55fbdeae2498166ec7c7301fd48d990fc9010058 (diff)
harfbuzz-1.7.6
git-svn-id: svn://tug.org/texlive/trunk@46877 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/libs/harfbuzz/harfbuzz-src/src/hb-subset.cc')
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diff --git a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-subset.cc b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-subset.cc
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+/*
+ * Copyright © 2018 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.
+ *
+ * Google Author(s): Garret Rieger, Rod Sheeter, Behdad Esfahbod
+ */
+
+#include "hb-private.hh"
+#include "hb-object-private.hh"
+#include "hb-open-type-private.hh"
+
+#include "hb-subset-glyf.hh"
+#include "hb-subset-private.hh"
+#include "hb-subset-plan.hh"
+
+#include "hb-open-file-private.hh"
+#include "hb-ot-cmap-table.hh"
+#include "hb-ot-glyf-table.hh"
+#include "hb-ot-hdmx-table.hh"
+#include "hb-ot-head-table.hh"
+#include "hb-ot-hhea-table.hh"
+#include "hb-ot-hmtx-table.hh"
+#include "hb-ot-maxp-table.hh"
+#include "hb-ot-os2-table.hh"
+
+
+#ifndef HB_NO_VISIBILITY
+const void * const OT::_hb_NullPool[HB_NULL_POOL_SIZE / sizeof (void *)] = {};
+#endif
+
+
+struct hb_subset_profile_t {
+ hb_object_header_t header;
+ ASSERT_POD ();
+};
+
+/**
+ * hb_subset_profile_create:
+ *
+ * Return value: New profile with default settings.
+ *
+ * Since: 1.8.0
+ **/
+hb_subset_profile_t *
+hb_subset_profile_create ()
+{
+ return hb_object_create<hb_subset_profile_t>();
+}
+
+/**
+ * hb_subset_profile_destroy:
+ *
+ * Since: 1.8.0
+ **/
+void
+hb_subset_profile_destroy (hb_subset_profile_t *profile)
+{
+ if (!hb_object_destroy (profile)) return;
+
+ free (profile);
+}
+
+template<typename TableType>
+static bool
+_subset (hb_subset_plan_t *plan)
+{
+ OT::Sanitizer<TableType> sanitizer;
+
+ hb_blob_t *source_blob = sanitizer.sanitize (plan->source->reference_table (TableType::tableTag));
+ const TableType *table = OT::Sanitizer<TableType>::lock_instance (source_blob);
+
+ hb_bool_t result = false;
+ if (table != &OT::Null(TableType))
+ result = table->subset(plan);
+
+ hb_blob_destroy (source_blob);
+ hb_tag_t tag = TableType::tableTag;
+ DEBUG_MSG(SUBSET, nullptr, "OT::%c%c%c%c::subset %s", HB_UNTAG(tag), result ? "success" : "FAILED!");
+ return result;
+}
+
+
+/*
+ * A face that has add_table().
+ */
+
+struct hb_subset_face_data_t
+{
+ struct table_entry_t
+ {
+ inline int cmp (const hb_tag_t *t) const
+ {
+ if (*t < tag) return -1;
+ if (*t > tag) return -1;
+ return 0;
+ }
+
+ hb_tag_t tag;
+ hb_blob_t *blob;
+ };
+
+ hb_prealloced_array_t<table_entry_t, 32> tables;
+};
+
+static hb_subset_face_data_t *
+_hb_subset_face_data_create (void)
+{
+ hb_subset_face_data_t *data = (hb_subset_face_data_t *) calloc (1, sizeof (hb_subset_face_data_t));
+ if (unlikely (!data))
+ return nullptr;
+
+ return data;
+}
+
+static void
+_hb_subset_face_data_destroy (void *user_data)
+{
+ hb_subset_face_data_t *data = (hb_subset_face_data_t *) user_data;
+
+ for (unsigned int i = 0; i < data->tables.len; i++)
+ hb_blob_destroy (data->tables[i].blob);
+
+ data->tables.finish ();
+
+ free (data);
+}
+
+static hb_blob_t *
+_hb_subset_face_data_reference_blob (hb_subset_face_data_t *data)
+{
+
+ unsigned int table_count = data->tables.len;
+ unsigned int face_length = table_count * 16 + 12;
+
+ for (unsigned int i = 0; i < table_count; i++)
+ face_length += _hb_ceil_to_4 (hb_blob_get_length (data->tables.array[i].blob));
+
+ char *buf = (char *) malloc (face_length);
+ if (unlikely (!buf))
+ return nullptr;
+
+ OT::hb_serialize_context_t c (buf, face_length);
+ OT::OpenTypeFontFile *f = c.start_serialize<OT::OpenTypeFontFile> ();
+
+ bool is_cff = data->tables.lsearch (HB_TAG ('C','F','F',' ')) || data->tables.lsearch (HB_TAG ('C','F','F','2'));
+ hb_tag_t sfnt_tag = is_cff ? OT::OpenTypeFontFile::CFFTag : OT::OpenTypeFontFile::TrueTypeTag;
+
+ OT::Supplier<hb_tag_t> tags_supplier (&data->tables[0].tag, table_count, sizeof (data->tables[0]));
+ OT::Supplier<hb_blob_t *> blobs_supplier (&data->tables[0].blob, table_count, sizeof (data->tables[0]));
+ bool ret = f->serialize_single (&c,
+ sfnt_tag,
+ tags_supplier,
+ blobs_supplier,
+ table_count);
+
+ c.end_serialize ();
+
+ if (unlikely (!ret))
+ {
+ free (buf);
+ return nullptr;
+ }
+
+ return hb_blob_create (buf, face_length, HB_MEMORY_MODE_WRITABLE, buf, free);
+}
+
+static hb_blob_t *
+_hb_subset_face_reference_table (hb_face_t *face, hb_tag_t tag, void *user_data)
+{
+ hb_subset_face_data_t *data = (hb_subset_face_data_t *) user_data;
+
+ if (!tag)
+ return _hb_subset_face_data_reference_blob (data);
+
+ hb_subset_face_data_t::table_entry_t *entry = data->tables.lsearch (tag);
+ if (entry)
+ return hb_blob_reference (entry->blob);
+
+ return nullptr;
+}
+
+/* TODO: Move this to hb-face.h and rename to hb_face_builder_create()
+ * with hb_face_builder_add_table(). */
+hb_face_t *
+hb_subset_face_create (void)
+{
+ hb_subset_face_data_t *data = _hb_subset_face_data_create ();
+ if (unlikely (!data)) return hb_face_get_empty ();
+
+ return hb_face_create_for_tables (_hb_subset_face_reference_table,
+ data,
+ _hb_subset_face_data_destroy);
+}
+
+hb_bool_t
+hb_subset_face_add_table (hb_face_t *face, hb_tag_t tag, hb_blob_t *blob)
+{
+ if (unlikely (face->destroy != _hb_subset_face_data_destroy))
+ return false;
+
+ hb_subset_face_data_t *data = (hb_subset_face_data_t *) face->user_data;
+ hb_subset_face_data_t::table_entry_t *entry = data->tables.push ();
+ if (unlikely (!entry))
+ return false;
+
+ entry->tag = tag;
+ entry->blob = hb_blob_reference (blob);
+
+ return true;
+}
+
+static bool
+_subset_table (hb_subset_plan_t *plan,
+ hb_tag_t tag)
+{
+ DEBUG_MSG(SUBSET, nullptr, "begin subset %c%c%c%c", HB_UNTAG(tag));
+ bool result = true;
+ switch (tag) {
+ case HB_OT_TAG_glyf:
+ result = _subset<const OT::glyf> (plan);
+ break;
+ case HB_OT_TAG_hdmx:
+ result = _subset<const OT::hdmx> (plan);
+ break;
+ case HB_OT_TAG_head:
+ // TODO that won't work well if there is no glyf
+ DEBUG_MSG(SUBSET, nullptr, "skip head, handled by glyf");
+ result = true;
+ break;
+ case HB_OT_TAG_hhea:
+ DEBUG_MSG(SUBSET, nullptr, "skip hhea handled by hmtx");
+ return true;
+ case HB_OT_TAG_hmtx:
+ result = _subset<const OT::hmtx> (plan);
+ break;
+ case HB_OT_TAG_maxp:
+ result = _subset<const OT::maxp> (plan);
+ break;
+ case HB_OT_TAG_loca:
+ DEBUG_MSG(SUBSET, nullptr, "skip loca handled by glyf");
+ return true;
+ case HB_OT_TAG_cmap:
+ result = _subset<const OT::cmap> (plan);
+ break;
+ case HB_OT_TAG_os2:
+ result = _subset<const OT::os2> (plan);
+ break;
+ default:
+ hb_blob_t *source_table = hb_face_reference_table(plan->source, tag);
+ if (likely (source_table))
+ result = hb_subset_plan_add_table(plan, tag, source_table);
+ else
+ result = false;
+ hb_blob_destroy (source_table);
+ break;
+ }
+ DEBUG_MSG(SUBSET, nullptr, "subset %c%c%c%c %s", HB_UNTAG(tag), result ? "ok" : "FAILED");
+ return result;
+}
+
+static bool
+_should_drop_table(hb_subset_plan_t *plan, hb_tag_t tag)
+{
+ switch (tag) {
+ case HB_TAG ('c', 'v', 'a', 'r'): /* hint table, fallthrough */
+ case HB_TAG ('c', 'v', 't', ' '): /* hint table, fallthrough */
+ case HB_TAG ('f', 'p', 'g', 'm'): /* hint table, fallthrough */
+ case HB_TAG ('p', 'r', 'e', 'p'): /* hint table, fallthrough */
+ case HB_TAG ('h', 'd', 'm', 'x'): /* hint table, fallthrough */
+ case HB_TAG ('V', 'D', 'M', 'X'): /* hint table, fallthrough */
+ return plan->drop_hints;
+ case HB_TAG ('G', 'D', 'E', 'F'): /* temporary */
+ case HB_TAG ('G', 'P', 'O', 'S'): /* temporary */
+ case HB_TAG ('G', 'S', 'U', 'B'): /* temporary */
+ case HB_TAG ('D', 'S', 'I', 'G'):
+ return true;
+ default:
+ return false;
+ }
+}
+
+/**
+ * hb_subset:
+ * @source: font face data to be subset.
+ * @profile: profile to use for the subsetting.
+ * @input: input to use for the subsetting.
+ *
+ * Subsets a font according to provided profile and input.
+ **/
+hb_face_t *
+hb_subset (hb_face_t *source,
+ hb_subset_profile_t *profile,
+ hb_subset_input_t *input)
+{
+ if (unlikely (!profile || !input || !source)) return hb_face_get_empty();
+
+ hb_subset_plan_t *plan = hb_subset_plan_create (source, profile, input);
+
+ hb_tag_t table_tags[32];
+ unsigned int offset = 0, count;
+ bool success = true;
+ do {
+ count = ARRAY_LENGTH (table_tags);
+ hb_face_get_table_tags (source, offset, &count, table_tags);
+ for (unsigned int i = 0; i < count; i++)
+ {
+ hb_tag_t tag = table_tags[i];
+ if (_should_drop_table(plan, tag))
+ {
+ DEBUG_MSG(SUBSET, nullptr, "drop %c%c%c%c", HB_UNTAG(tag));
+ continue;
+ }
+ success = success && _subset_table (plan, tag);
+ }
+ } while (count == ARRAY_LENGTH (table_tags));
+
+ hb_face_t *result = success ? hb_face_reference(plan->dest) : hb_face_get_empty();
+ hb_subset_plan_destroy (plan);
+ return result;
+}