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      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_BITMAP_INDEX_SUBTABLE_FORMAT4_H_
     18 #define SFNTLY_CPP_SRC_SFNTLY_TABLE_BITMAP_INDEX_SUBTABLE_FORMAT4_H_
     19 
     20 #include "sfntly/table/bitmap/index_sub_table.h"
     21 
     22 namespace sfntly {
     23 
     24 class IndexSubTableFormat4 : public IndexSubTable,
     25                              public RefCounted<IndexSubTableFormat4> {
     26  public:
     27   class CodeOffsetPair {
     28    public:
     29     int32_t glyph_code() const { return glyph_code_; }
     30     int32_t offset() const { return offset_; }
     31 
     32    protected:
     33     CodeOffsetPair(int32_t glyph_code, int32_t offset);
     34 
     35     // TODO(arthurhsu): C++ style guide prohibits protected members.
     36     int32_t glyph_code_;
     37     int32_t offset_;
     38   };
     39 
     40   class CodeOffsetPairBuilder : public CodeOffsetPair {
     41    public:
     42     CodeOffsetPairBuilder();
     43     CodeOffsetPairBuilder(int32_t glyph_code, int32_t offset);
     44     void set_glyph_code(int32_t v) { glyph_code_ = v; }
     45     void set_offset(int32_t v) { offset_ = v; }
     46   };
     47 
     48   class CodeOffsetPairGlyphCodeComparator {
     49    public:
     50     bool operator()(const CodeOffsetPair& lhs, const CodeOffsetPair& rhs);
     51   };
     52 
     53   class Builder : public IndexSubTable::Builder,
     54                   public RefCounted<Builder> {
     55    public:
     56     class BitmapGlyphInfoIterator
     57         : public RefIterator<BitmapGlyphInfo, Builder, IndexSubTable::Builder> {
     58      public:
     59       explicit BitmapGlyphInfoIterator(Builder* container);
     60       virtual ~BitmapGlyphInfoIterator() {}
     61 
     62       virtual bool HasNext();
     63       CALLER_ATTACH virtual BitmapGlyphInfo* Next();
     64 
     65      private:
     66       int32_t code_offset_pair_index_;
     67     };
     68 
     69     virtual ~Builder();
     70     virtual int32_t NumGlyphs();
     71     virtual int32_t GlyphLength(int32_t glyph_id);
     72     virtual int32_t GlyphStartOffset(int32_t glyph_id);
     73     CALLER_ATTACH virtual BitmapGlyphInfoIterator* GetIterator();
     74 
     75     virtual CALLER_ATTACH FontDataTable* SubBuildTable(ReadableFontData* data);
     76     virtual void SubDataSet();
     77     virtual int32_t SubDataSizeToSerialize();
     78     virtual bool SubReadyToSerialize();
     79     virtual int32_t SubSerialize(WritableFontData* new_data);
     80 
     81     void Revert();
     82     void SetOffsetArray(const std::vector<CodeOffsetPairBuilder>& pair_array);
     83 
     84     static CALLER_ATTACH Builder* CreateBuilder();
     85     static CALLER_ATTACH Builder* CreateBuilder(ReadableFontData* data,
     86                                                 int32_t index_sub_table_offset,
     87                                                 int32_t first_glyph_index,
     88                                                 int32_t last_glyph_index);
     89     static CALLER_ATTACH Builder* CreateBuilder(WritableFontData* data,
     90                                                 int32_t index_sub_table_offset,
     91                                                 int32_t first_glyph_index,
     92                                                 int32_t last_glyph_index);
     93    private:
     94     Builder();
     95     Builder(WritableFontData* data,
     96             int32_t first_glyph_index,
     97             int32_t last_glyph_index);
     98     Builder(ReadableFontData* data,
     99             int32_t first_glyph_index,
    100             int32_t last_glyph_index);
    101     std::vector<CodeOffsetPairBuilder>* GetOffsetArray();
    102     void Initialize(ReadableFontData* data);
    103     int32_t FindCodeOffsetPair(int32_t glyph_id);
    104 
    105     static int32_t DataLength(ReadableFontData* data,
    106                               int32_t index_sub_table_offset,
    107                               int32_t first_glyph_index,
    108                               int32_t last_glyph_index);
    109 
    110     std::vector<CodeOffsetPairBuilder> offset_pair_array_;
    111   };
    112 
    113   virtual ~IndexSubTableFormat4();
    114 
    115   virtual int32_t NumGlyphs();
    116   virtual int32_t GlyphStartOffset(int32_t glyph_id);
    117   virtual int32_t GlyphLength(int32_t glyph_id);
    118 
    119  private:
    120   IndexSubTableFormat4(ReadableFontData* data,
    121                        int32_t first_glyph_index,
    122                        int32_t last_glyph_index);
    123 
    124   int32_t FindCodeOffsetPair(int32_t glyph_id);
    125   static int32_t NumGlyphs(ReadableFontData* data, int32_t table_offset);
    126 
    127   friend class Builder;
    128 };
    129 typedef Ptr<IndexSubTableFormat4> IndexSubTableFormat4Ptr;
    130 typedef Ptr<IndexSubTableFormat4::Builder> IndexSubTableFormat4BuilderPtr;
    131 typedef std::vector<IndexSubTableFormat4::CodeOffsetPairBuilder>
    132             CodeOffsetPairBuilderList;
    133 }  // namespace sfntly
    134 
    135 #endif  // SFNTLY_CPP_SRC_SFNTLY_TABLE_BITMAP_INDEX_SUBTABLE_FORMAT4_H_
    136