1/*
2 * Copyright 2011 Google Inc. All Rights Reserved.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "sfntly/tools/subsetter/subsetter.h"
18
19#include <algorithm>
20#include <iterator>
21
22#include "sfntly/tools/subsetter/glyph_table_subsetter.h"
23
24namespace sfntly {
25
26Subsetter::Subsetter(Font* font, FontFactory* font_factory) {
27  font_ = font;
28  font_factory_ = font_factory;
29  TableSubsetterPtr subsetter = new GlyphTableSubsetter();
30  // TODO(arthurhsu): IMPLEMENT: CMap table subsetter
31  table_subsetters_.push_back(subsetter);
32}
33
34Subsetter::~Subsetter() {
35  font_factory_.Release();
36  font_.Release();
37  table_subsetters_.clear();
38}
39
40void Subsetter::SetGlyphs(IntegerList* glyphs) {
41  new_to_old_glyphs_ = *glyphs;
42}
43
44void Subsetter::SetCMaps(CMapIdList* cmap_ids, int32_t number) {
45  UNREFERENCED_PARAMETER(cmap_ids);
46  UNREFERENCED_PARAMETER(number);
47  // TODO(arthurhsu): IMPLEMENT
48}
49
50void Subsetter::SetRemoveTables(IntegerSet* remove_tables) {
51  remove_tables_ = *remove_tables;
52}
53
54CALLER_ATTACH Font::Builder* Subsetter::Subset() {
55  FontBuilderPtr font_builder;
56  font_builder.Attach(font_factory_->NewFontBuilder());
57
58  IntegerSet table_tags;
59  for (TableMap::const_iterator i = font_->GetTableMap()->begin(),
60                                e = font_->GetTableMap()->end(); i != e; ++i) {
61    table_tags.insert(i->first);
62  }
63  if (!remove_tables_.empty()) {
64    IntegerSet result;
65    std::set_difference(table_tags.begin(), table_tags.end(),
66                        remove_tables_.begin(), remove_tables_.end(),
67                        std::inserter(result, result.end()));
68    table_tags = result;
69  }
70  for (TableSubsetterList::iterator
71           table_subsetter = table_subsetters_.begin(),
72           table_subsetter_end = table_subsetters_.end();
73           table_subsetter != table_subsetter_end; ++table_subsetter) {
74    bool handled = (*table_subsetter)->Subset(this, font_, font_builder);
75    if (handled) {
76      IntegerSet* handled_tags = (*table_subsetter)->TagsHandled();
77      IntegerSet result;
78      std::set_difference(table_tags.begin(), table_tags.end(),
79                          handled_tags->begin(), handled_tags->end(),
80                          std::inserter(result, result.end()));
81      table_tags = result;
82    }
83  }
84  for (IntegerSet::iterator tag = table_tags.begin(),
85                            tag_end = table_tags.end(); tag != tag_end; ++tag) {
86    Table* table = font_->GetTable(*tag);
87    if (table) {
88      font_builder->NewTableBuilder(*tag, table->ReadFontData());
89    }
90  }
91  return font_builder.Detach();
92}
93
94IntegerList* Subsetter::GlyphPermutationTable() {
95  return &new_to_old_glyphs_;
96}
97
98CMapIdList* Subsetter::CMapId() {
99  return &cmap_ids_;
100}
101
102}  // namespace sfntly
103