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      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 "subtly/subsetter.h"
     18 
     19 #include <stdio.h>
     20 
     21 #include "sfntly/font.h"
     22 #include "sfntly/font_factory.h"
     23 #include "sfntly/tag.h"
     24 #include "subtly/character_predicate.h"
     25 #include "subtly/font_assembler.h"
     26 #include "subtly/font_info.h"
     27 #include "subtly/utils.h"
     28 
     29 namespace subtly {
     30 using namespace sfntly;
     31 
     32 /******************************************************************************
     33  * Subsetter class
     34  ******************************************************************************/
     35 Subsetter::Subsetter(Font* font, CharacterPredicate* predicate)
     36     : font_(font),
     37       predicate_(predicate) {
     38 }
     39 
     40 Subsetter::Subsetter(const char* font_path, CharacterPredicate* predicate)
     41     : predicate_(predicate) {
     42   font_.Attach(LoadFont(font_path));
     43 }
     44 
     45 CALLER_ATTACH Font* Subsetter::Subset() {
     46   Ptr<FontSourcedInfoBuilder> info_builder =
     47       new FontSourcedInfoBuilder(font_, 0, predicate_);
     48 
     49   Ptr<FontInfo> font_info;
     50   font_info.Attach(info_builder->GetFontInfo());
     51   if (!font_info) {
     52 #if defined (SUBTLY_DEBUG)
     53     fprintf(stderr,
     54             "Couldn't create font info. No subset will be generated.\n");
     55 #endif
     56     return NULL;
     57   }
     58   IntegerSet* table_blacklist = new IntegerSet;
     59   table_blacklist->insert(Tag::DSIG);
     60   Ptr<FontAssembler> font_assembler = new FontAssembler(font_info,
     61                                                         table_blacklist);
     62   Ptr<Font> font_subset;
     63   font_subset.Attach(font_assembler->Assemble());
     64   delete table_blacklist;
     65   return font_subset.Detach();
     66 }
     67 }
     68