// @(#)root/graf:$Id$
// Author: Olivier Couet     01/10/02
// Author: Fons Rademakers   21/11/98

/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

#ifndef ROOT_TTF
#define ROOT_TTF


#include "Rtypes.h"

/// @cond DOXYGEN_IGNORE
// Forward declare for the headers:
// #  include <ft2build.h>
// #  include FT_FREETYPE_H
// #  include FT_GLYPH_H
extern "C" {
   struct FT_LibraryRec_;
   struct FT_FaceRec_;
   struct FT_CharMapRec_;
   struct FT_GlyphRec_;
   struct FT_Matrix_;
   struct FT_Bitmap_;
   typedef struct FT_LibraryRec_* FT_Library;
   typedef struct FT_FaceRec_* FT_Face;
   typedef struct FT_CharMapRec_* FT_CharMap;
   typedef struct FT_GlyphRec_* FT_Glyph;
   typedef struct FT_Matrix_ FT_Matrix;
   typedef struct FT_Bitmap_ FT_Bitmap; // Forward declared for TGX11TTF.h's benefit
   typedef signed long FT_Pos;
   #ifndef FT_FREETYPE_H
   struct FT_Vector_ { FT_Pos x, y; };
   struct FT_BBox_ { FT_Pos xMin, yMin, xMax, yMax; };
   #endif
   typedef struct FT_Vector_ FT_Vector;
   typedef struct FT_BBox_ FT_BBox;
}
/// @endcond


class TGX11TTF;
class TGWin32;
class TMathTextRenderer;


class TTF {

friend class TGX11TTF;
friend class TGWin32;
friend class TMathTextRenderer;

public:

/** \class TTGlyph
TTF helper class containing glyphs description.
*/

   class TTGlyph {
   public:
      UInt_t     fIndex{0};     ///< glyph index in face
      FT_Vector  fPos;          ///< position of glyph origin
      FT_Glyph   fImage{nullptr}; ///< glyph image
   };

protected:
   enum { kTTMaxFonts = 32, kMaxGlyphs = 1024 };

   static Int_t          fgAscent;                ///< string ascent, used to compute Y alignment
   static FT_BBox        fgCBox;                  ///< string control box
   static FT_CharMap     fgCharMap[kTTMaxFonts];  ///< font character map
   static Int_t          fgCurFontIdx;            ///< current font index
   static Int_t          fgFontCount;             ///< number of fonts loaded
   static char          *fgFontName[kTTMaxFonts]; ///< font name
   static Int_t          fgFontIdx[kTTMaxFonts];  ///< font index in font file
   static Int_t          fgFontIta[kTTMaxFonts];  ///< font slanted using transform
   static FT_Face        fgFace[kTTMaxFonts];     ///< font face
   static TTF::TTGlyph   fgGlyphs[kMaxGlyphs];    ///< glyphs
   static Bool_t         fgHinting;               ///< use hinting (true by default)
   static Bool_t         fgInit;                  ///< true if the Init has been called
   static Bool_t         fgKerning;               ///< use kerning (true by default)
   static FT_Library     fgLibrary;               ///< FreeType font library
   static Int_t          fgNumGlyphs;             ///< number of glyphs in the string
   static FT_Matrix     *fgRotMatrix;             ///< rotation matrix
   static Bool_t         fgSmoothing;             ///< use anti-aliasing (true when >8 planes, false otherwise)
   static Int_t          fgTBlankW;               ///< trailing blanks width
   static Int_t          fgWidth;                 ///< string width, used to compute X alignment

public:
   static Short_t CharToUnicode(UInt_t code);
   static void    LayoutGlyphs();
   static void    PrepareString(const char *string);
   static void    PrepareString(const wchar_t *string);
   static void    SetRotationMatrix(Float_t angle);

public:
   TTF() { }
   virtual ~TTF();

   static void           Init();
   static void           Cleanup();
   static void           ComputeTrailingBlanksWidth(Int_t n);
   static Int_t          GetAscent();
   static const FT_BBox &GetBox();
   static TTGlyph       *GetGlyphs();
   static Bool_t         GetHinting();
   static Bool_t         GetKerning();
   static Int_t          GetNumGlyphs();
   static FT_Matrix     *GetRotMatrix();
   static Bool_t         GetSmoothing();
   static Int_t          GetTrailingBlanksWidth();
   static Int_t          GetWidth();
   static void           SetHinting(Bool_t state);
   static void           SetKerning(Bool_t state);
   static void           SetSmoothing(Bool_t state);
   static void           GetTextExtent(UInt_t &w, UInt_t &h, char *text);
   static void           GetTextExtent(UInt_t &w, UInt_t &h, wchar_t *text);
   static void           GetTextAdvance(UInt_t &a, char *text);
   static void           SetTextFont(Font_t fontnumber);
   static Int_t          SetTextFont(const char *fontname, Int_t italic=0);
   static void           SetTextSize(Float_t textsize);
   static Bool_t         IsInitialized();
   static void           Version(Int_t &major, Int_t &minor, Int_t &patch);

   ClassDef(TTF,0)  //Interface to TTF font handling
};

#endif