Push subsetter code upstream

third_party/sfntly/src/subsetter/subsetter_impl.h

-/*
- * 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.
- */
-
-#ifndef THIRD_PARTY_SFNTLY_SRC_SUBSETTER_SUBSETTER_IMPL_H_
-#define THIRD_PARTY_SFNTLY_SRC_SUBSETTER_SUBSETTER_IMPL_H_
-
-#include "third_party/sfntly/src/sfntly/font.h"
-#include "third_party/sfntly/src/sfntly/font_factory.h"
-#include "third_party/sfntly/src/sfntly/table/truetype/glyph_table.h"
-#include "third_party/sfntly/src/sfntly/table/truetype/loca_table.h"
-#include "third_party/sfntly/src/sfntly/tag.h"
-
-namespace sfntly {
-
-// Smart pointer usage in sfntly:
-//
-// sfntly carries a smart pointer implementation like COM.  Ref-countable object
-// type inherits from RefCounted<>, which have AddRef and Release just like
-// IUnknown (but no QueryInterface).  Use a Ptr<> based smart pointer to hold
-// the object so that the object ref count is handled correctly.
-//
-// class Foo : public RefCounted<Foo> {
-//  public:
-//   static Foo* CreateInstance() {
-//     Ptr<Foo> obj = new Foo();  // ref count = 1
-//     return obj.detach();
-//   }
-// };
-// typedef Ptr<Foo> FooPtr;  // common short-hand notation
-// FooPtr obj;
-// obj.attach(Foo::CreatedInstance());  // ref count = 1
-// {
-//   FooPtr obj2 = obj;  // ref count = 2
-// }  // ref count = 1, obj2 out of scope
-// obj.release();  // ref count = 0, object destroyed
-
-class SubsetterImpl {
- public:
-  SubsetterImpl();
-  ~SubsetterImpl();
-
-  bool LoadFont(const char* font_name,
-                const unsigned char* original_font,
-                size_t font_size);
-  int SubsetFont(const unsigned int* glyph_ids,
-                 size_t glyph_count,
-                 unsigned char** output_buffer);
-
- private:
-  CALLER_ATTACH Font* Subset(const IntegerSet& glyph_ids,
-                             GlyphTable* glyf, LocaTable* loca);
-
-  FontFactoryPtr factory_;
-  FontPtr font_;
-};
-
-}  // namespace sfntly
-
-#endif  // THIRD_PARTY_SFNTLY_SRC_SUBSETTER_SUBSETTER_IMPL_H_