| /* |
| * Copyright 2011 Google Inc. All Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "sfntly/tools/subsetter/glyph_table_subsetter.h" |
| |
| #include "sfntly/table/truetype/glyph_table.h" |
| #include "sfntly/table/truetype/loca_table.h" |
| #include "sfntly/tag.h" |
| #include "sfntly/tools/subsetter/subsetter.h" |
| #include "sfntly/port/exception_type.h" |
| |
| namespace sfntly { |
| |
| const int32_t kGlyphTableSubsetterTags[2] = {Tag::glyf, Tag::loca}; |
| |
| GlyphTableSubsetter::GlyphTableSubsetter() |
| : TableSubsetterImpl(kGlyphTableSubsetterTags, 2) { |
| } |
| |
| GlyphTableSubsetter::~GlyphTableSubsetter() {} |
| |
| bool GlyphTableSubsetter::Subset(Subsetter* subsetter, |
| Font* font, |
| Font::Builder* font_builder) { |
| assert(font); |
| assert(subsetter); |
| assert(font_builder); |
| |
| IntegerList* permutation_table = subsetter->GlyphPermutationTable(); |
| if (!permutation_table || permutation_table->empty()) |
| return false; |
| |
| GlyphTablePtr glyph_table = down_cast<GlyphTable*>(font->GetTable(Tag::glyf)); |
| LocaTablePtr loca_table = down_cast<LocaTable*>(font->GetTable(Tag::loca)); |
| if (glyph_table == NULL || loca_table == NULL) { |
| #if !defined (SFNTLY_NO_EXCEPTION) |
| throw RuntimeException("Font to subset is not valid."); |
| #endif |
| return false; |
| } |
| |
| GlyphTableBuilderPtr glyph_table_builder = |
| down_cast<GlyphTable::Builder*> |
| (font_builder->NewTableBuilder(Tag::glyf)); |
| LocaTableBuilderPtr loca_table_builder = |
| down_cast<LocaTable::Builder*> |
| (font_builder->NewTableBuilder(Tag::loca)); |
| if (glyph_table_builder == NULL || loca_table_builder == NULL) { |
| #if !defined (SFNTLY_NO_EXCEPTION) |
| throw RuntimeException("Builder for subset is not valid."); |
| #endif |
| return false; |
| } |
| GlyphTable::GlyphBuilderList* glyph_builders = |
| glyph_table_builder->GlyphBuilders(); |
| for (IntegerList::iterator old_glyph_id = permutation_table->begin(), |
| old_glyph_id_end = permutation_table->end(); |
| old_glyph_id != old_glyph_id_end; ++old_glyph_id) { |
| int old_offset = loca_table->GlyphOffset(*old_glyph_id); |
| int old_length = loca_table->GlyphLength(*old_glyph_id); |
| GlyphPtr glyph; |
| glyph.Attach(glyph_table->GetGlyph(old_offset, old_length)); |
| ReadableFontDataPtr data = glyph->ReadFontData(); |
| WritableFontDataPtr copy_data; |
| copy_data.Attach(WritableFontData::CreateWritableFontData(data->Length())); |
| data->CopyTo(copy_data); |
| GlyphBuilderPtr glyph_builder; |
| glyph_builder.Attach(glyph_table_builder->GlyphBuilder(copy_data)); |
| glyph_builders->push_back(glyph_builder); |
| } |
| IntegerList loca_list; |
| glyph_table_builder->GenerateLocaList(&loca_list); |
| loca_table_builder->SetLocaList(&loca_list); |
| return true; |
| } |
| |
| } // namespace sfntly |