Line data    Source code

       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/glyph_table_subsetter.h"
      18             : 
      19             : #include "sfntly/table/truetype/glyph_table.h"
      20             : #include "sfntly/table/truetype/loca_table.h"
      21             : #include "sfntly/tag.h"
      22             : #include "sfntly/tools/subsetter/subsetter.h"
      23             : #include "sfntly/port/exception_type.h"
      24             : 
      25             : namespace sfntly {
      26             : 
      27             : const int32_t kGlyphTableSubsetterTags[2] = {Tag::glyf, Tag::loca};
      28             : 
      29           0 : GlyphTableSubsetter::GlyphTableSubsetter()
      30           0 :     : TableSubsetterImpl(kGlyphTableSubsetterTags, 2) {
      31           0 : }
      32             : 
      33           0 : GlyphTableSubsetter::~GlyphTableSubsetter() {}
      34             : 
      35           0 : bool GlyphTableSubsetter::Subset(Subsetter* subsetter,
      36             :                                  Font* font,
      37             :                                  Font::Builder* font_builder) {
      38           0 :   assert(font);
      39           0 :   assert(subsetter);
      40           0 :   assert(font_builder);
      41             : 
      42           0 :   IntegerList* permutation_table = subsetter->GlyphPermutationTable();
      43           0 :   if (!permutation_table || permutation_table->empty())
      44           0 :     return false;
      45             : 
      46           0 :   GlyphTablePtr glyph_table = down_cast<GlyphTable*>(font->GetTable(Tag::glyf));
      47           0 :   LocaTablePtr loca_table = down_cast<LocaTable*>(font->GetTable(Tag::loca));
      48           0 :   if (glyph_table == NULL || loca_table == NULL) {
      49             : #if !defined (SFNTLY_NO_EXCEPTION)
      50             :     throw RuntimeException("Font to subset is not valid.");
      51             : #endif
      52           0 :     return false;
      53             :   }
      54             : 
      55             :   GlyphTableBuilderPtr glyph_table_builder =
      56             :       down_cast<GlyphTable::Builder*>
      57           0 :       (font_builder->NewTableBuilder(Tag::glyf));
      58             :   LocaTableBuilderPtr loca_table_builder =
      59             :       down_cast<LocaTable::Builder*>
      60           0 :       (font_builder->NewTableBuilder(Tag::loca));
      61           0 :   if (glyph_table_builder == NULL || loca_table_builder == NULL) {
      62             : #if !defined (SFNTLY_NO_EXCEPTION)
      63             :     throw RuntimeException("Builder for subset is not valid.");
      64             : #endif
      65           0 :     return false;
      66             :   }
      67             :   GlyphTable::GlyphBuilderList* glyph_builders =
      68           0 :       glyph_table_builder->GlyphBuilders();
      69           0 :   for (IntegerList::iterator old_glyph_id = permutation_table->begin(),
      70           0 :                              old_glyph_id_end = permutation_table->end();
      71             :                              old_glyph_id != old_glyph_id_end; ++old_glyph_id) {
      72           0 :     int old_offset = loca_table->GlyphOffset(*old_glyph_id);
      73           0 :     int old_length = loca_table->GlyphLength(*old_glyph_id);
      74           0 :     GlyphPtr glyph;
      75           0 :     glyph.Attach(glyph_table->GetGlyph(old_offset, old_length));
      76           0 :     ReadableFontDataPtr data = glyph->ReadFontData();
      77           0 :     WritableFontDataPtr copy_data;
      78           0 :     copy_data.Attach(WritableFontData::CreateWritableFontData(data->Length()));
      79           0 :     data->CopyTo(copy_data);
      80           0 :     GlyphBuilderPtr glyph_builder;
      81           0 :     glyph_builder.Attach(glyph_table_builder->GlyphBuilder(copy_data));
      82           0 :     glyph_builders->push_back(glyph_builder);
      83             :   }
      84           0 :   IntegerList loca_list;
      85           0 :   glyph_table_builder->GenerateLocaList(&loca_list);
      86           0 :   loca_table_builder->SetLocaList(&loca_list);
      87           0 :   return true;
      88             : }
      89             : 
      90             : }  // namespace sfntly