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             : #ifndef SFNTLY_CPP_SRC_SFNTLY_TABLE_SUBTABLE_H_
      18             : #define SFNTLY_CPP_SRC_SFNTLY_TABLE_SUBTABLE_H_
      19             : 
      20             : #include "sfntly/table/font_data_table.h"
      21             : 
      22             : namespace sfntly {
      23             : 
      24             : // An abstract base class for subtables. Subtables are smaller tables nested
      25             : // within other tables and don't have an entry in the main font index. Examples
      26             : // of these are the CMap subtables within CMap table (cmap) or a glyph within
      27             : // the glyph table (glyf).
      28             : class SubTable : public FontDataTable {
      29             :  public:
      30             :   class Builder : public FontDataTable::Builder {
      31             :    public:
      32             :     virtual ~Builder();
      33             : 
      34             :    protected:
      35             :     // @param data the data for the subtable being built
      36             :     // @param master_data the data for the full table
      37             :     Builder(int32_t data_size);
      38             :     Builder(WritableFontData* data, ReadableFontData* master_data);
      39             :     Builder(ReadableFontData* data, ReadableFontData* master_data);
      40             :     explicit Builder(WritableFontData* data);
      41             :     explicit Builder(ReadableFontData* data);
      42             : 
      43           0 :     ReadableFontData* master_read_data() { return master_data_; }
      44             : 
      45             :    private:
      46             :     ReadableFontDataPtr master_data_;
      47             :   };
      48             : 
      49             :   virtual ~SubTable();
      50           0 :   virtual int32_t Padding() { return padding_; }
      51             : 
      52             :   // Sets the amount of padding that is part of the data being used by this
      53             :   // subtable.
      54           0 :   void set_padding(int32_t padding) { padding_ = padding; }
      55             : 
      56             :  protected:
      57             :   SubTable(ReadableFontData* data, ReadableFontData* master_data);
      58             : 
      59             :   // Note: constructor refactored in C++ to avoid heavy lifting.
      60             :   //       caller need to do data->Slice(offset, length) beforehand.
      61             :   explicit SubTable(ReadableFontData* data);
      62             : 
      63           0 :   ReadableFontData* master_read_data() { return master_data_; }
      64             : 
      65             :  private:
      66             :   // The data for the whole table in which this subtable is contained.
      67             :   ReadableFontDataPtr master_data_;
      68             :   int32_t padding_;
      69             : };
      70             : 
      71             : }  // namespace sfntly
      72             : 
      73             : #endif  // SFNTLY_CPP_SRC_SFNTLY_TABLE_SUBTABLE_H_