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      1 // Copyright 2016 PDFium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 
      7 #ifndef CORE_FPDFAPI_FONT_CPDF_FONT_H_
      8 #define CORE_FPDFAPI_FONT_CPDF_FONT_H_
      9 
     10 #include <memory>
     11 #include <vector>
     12 
     13 #include "core/fxcrt/fx_string.h"
     14 #include "core/fxcrt/fx_system.h"
     15 #include "core/fxge/fx_font.h"
     16 
     17 class CFX_SubstFont;
     18 class CPDF_CIDFont;
     19 class CPDF_Dictionary;
     20 class CPDF_Document;
     21 class CPDF_Object;
     22 class CPDF_StreamAcc;
     23 class CPDF_TrueTypeFont;
     24 class CPDF_Type1Font;
     25 class CPDF_Type3Font;
     26 class CPDF_ToUnicodeMap;
     27 
     28 class CPDF_Font {
     29  public:
     30   static std::unique_ptr<CPDF_Font> Create(CPDF_Document* pDoc,
     31                                            CPDF_Dictionary* pFontDict);
     32   static CPDF_Font* GetStockFont(CPDF_Document* pDoc,
     33                                  const CFX_ByteStringC& fontname);
     34   static const uint32_t kInvalidCharCode = static_cast<uint32_t>(-1);
     35 
     36   virtual ~CPDF_Font();
     37 
     38   virtual bool IsType1Font() const;
     39   virtual bool IsTrueTypeFont() const;
     40   virtual bool IsType3Font() const;
     41   virtual bool IsCIDFont() const;
     42   virtual const CPDF_Type1Font* AsType1Font() const;
     43   virtual CPDF_Type1Font* AsType1Font();
     44   virtual const CPDF_TrueTypeFont* AsTrueTypeFont() const;
     45   virtual CPDF_TrueTypeFont* AsTrueTypeFont();
     46   virtual const CPDF_Type3Font* AsType3Font() const;
     47   virtual CPDF_Type3Font* AsType3Font();
     48   virtual const CPDF_CIDFont* AsCIDFont() const;
     49   virtual CPDF_CIDFont* AsCIDFont();
     50 
     51   virtual bool IsVertWriting() const;
     52   virtual bool IsUnicodeCompatible() const;
     53   virtual uint32_t GetNextChar(const FX_CHAR* pString,
     54                                int nStrLen,
     55                                int& offset) const;
     56   virtual int CountChar(const FX_CHAR* pString, int size) const;
     57   virtual int AppendChar(FX_CHAR* buf, uint32_t charcode) const;
     58   virtual int GlyphFromCharCode(uint32_t charcode, bool* pVertGlyph) = 0;
     59   virtual int GlyphFromCharCodeExt(uint32_t charcode);
     60   virtual CFX_WideString UnicodeFromCharCode(uint32_t charcode) const;
     61   virtual uint32_t CharCodeFromUnicode(FX_WCHAR Unicode) const;
     62 
     63   const CFX_ByteString& GetBaseFont() const { return m_BaseFont; }
     64   CFX_SubstFont* GetSubstFont() const { return m_Font.GetSubstFont(); }
     65   bool IsEmbedded() const { return IsType3Font() || m_pFontFile != nullptr; }
     66   CPDF_Dictionary* GetFontDict() const { return m_pFontDict; }
     67   bool IsStandardFont() const;
     68   FXFT_Face GetFace() const { return m_Font.GetFace(); }
     69   void AppendChar(CFX_ByteString& str, uint32_t charcode) const;
     70 
     71   void GetFontBBox(FX_RECT& rect) const { rect = m_FontBBox; }
     72   int GetTypeAscent() const { return m_Ascent; }
     73   int GetTypeDescent() const { return m_Descent; }
     74   int GetStringWidth(const FX_CHAR* pString, int size);
     75   uint32_t FallbackFontFromCharcode(uint32_t charcode);
     76   int FallbackGlyphFromCharcode(int fallbackFont, uint32_t charcode);
     77 
     78   virtual int GetCharWidthF(uint32_t charcode) = 0;
     79   virtual FX_RECT GetCharBBox(uint32_t charcode) = 0;
     80 
     81   CPDF_Document* m_pDocument;
     82   CFX_Font m_Font;
     83   std::vector<std::unique_ptr<CFX_Font>> m_FontFallbacks;
     84 
     85  protected:
     86   CPDF_Font();
     87 
     88   virtual bool Load() = 0;
     89 
     90   void LoadUnicodeMap() const;  // logically const only.
     91   void LoadPDFEncoding(CPDF_Object* pEncoding,
     92                        int& iBaseEncoding,
     93                        std::vector<CFX_ByteString>* pCharNames,
     94                        bool bEmbedded,
     95                        bool bTrueType);
     96   void LoadFontDescriptor(CPDF_Dictionary* pDict);
     97   void CheckFontMetrics();
     98 
     99   const FX_CHAR* GetAdobeCharName(int iBaseEncoding,
    100                                   const std::vector<CFX_ByteString>& charnames,
    101                                   int charcode);
    102 
    103   CFX_ByteString m_BaseFont;
    104   CPDF_StreamAcc* m_pFontFile;
    105   CPDF_Dictionary* m_pFontDict;
    106   mutable std::unique_ptr<CPDF_ToUnicodeMap> m_pToUnicodeMap;
    107   mutable bool m_bToUnicodeLoaded;
    108   int m_Flags;
    109   FX_RECT m_FontBBox;
    110   int m_StemV;
    111   int m_Ascent;
    112   int m_Descent;
    113   int m_ItalicAngle;
    114 };
    115 
    116 #endif  // CORE_FPDFAPI_FONT_CPDF_FONT_H_
    117