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/*
* 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
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