/*
 * The layout of a font information block.
 * There is one of these for every loaded font or magnification thereof.
 * Duplicates are eliminated:  this is necessary because of possible recursion
 * in virtual fonts.
 *
 * Also note the strange units.  The design size is in 1/2^20 point
 * units (also called micro-points), and the individual character widths
 * are in the TFM file in 1/2^20 ems units, i.e., relative to the design size.
 *
 * We then change the sizes to SPELL units (unshrunk pixel / 2^16).
 */


#ifndef _FONT_H
#define _FONT_H

class dviWindow;
typedef	void	(dviWindow::*set_char_proc)(unsigned int, unsigned int);

#include <kprocess.h>
#include <qintdict.h>
#include <qstring.h>
#include <stdio.h>

//#include "dviwin.h"
#include "glyph.h"

class TeXFont;



// Per character information for virtual fonts

class macro {
 public:
  macro(void);
  ~macro(void);

  unsigned char	*pos;		/* address of first byte of macro */
  unsigned char	*end;		/* address of last+1 byte */
  Q_INT32        dvi_advance_in_units_of_design_size_by_2e20;	/* DVI units to move reference point */
  bool          free_me;        // if memory at pos should be returned on destruction
};


class TeXFontDefinition {
 public:
  // Currently, kdvi supports fonts with at most 256 characters to
  // comply with "The DVI Driver Standard, Level 0". If you change
  // this value here, make sure to go through all the source and
  // ensure that character numbers are stored in ints rather than
  // unsigned chars.
  static const unsigned int max_num_of_chars_in_font = 256;
  enum font_flags {
    FONT_IN_USE  = 1,	// used for housekeeping
    FONT_LOADED  = 2,	// if font file has been read
    FONT_VIRTUAL = 4,	// if font is virtual 
    FONT_KPSE_NAME = 8 // if kpathsea has already tried to find the font name
  };
  

  TeXFontDefinition(QString nfontname, double _displayResolution_in_dpi, Q_UINT32 chk, Q_INT32 _scaled_size_in_DVI_units,
       class fontPool *pool, double _enlargement);
  ~TeXFontDefinition();

  void reset(void);


  void fontNameReceiver(QString);

  // Members for character fonts
  void           setDisplayResolution(double _displayResolution_in_dpi);

  void           mark_as_used(void);
  class fontPool *font_pool;    // Pointer to the pool that contains this font.
  QString        fontname;	// name of font, such as "cmr10"
  unsigned char  flags;		// flags byte (see values below)
  double         enlargement;
  Q_INT32        scaled_size_in_DVI_units;   // Scaled size from the font definition command; in DVI units
  set_char_proc  set_char_p;	// proc used to set char
  
  // Resolution of the display device (resolution will usually be
  // scaled, according to the zoom)
  double         displayResolution_in_dpi;
  
  FILE          *file;		// open font file or NULL
  QString        filename;	// name of font file
  
  TeXFont       *font;
  macro         *macrotable;    // used by (loaded) virtual fonts
  QIntDict<TeXFontDefinition> vf_table;      // used by (loaded) virtual fonts, list of fonts used by this vf, 
  // acessible by number
  TeXFontDefinition  *first_font;	// used by (loaded) virtual fonts, list of fonts used by this vf
  
 private:
  Q_UINT32       checksum;
  
  // Functions related to virtual fonts
  void          read_VF_index(void );
  
};

#endif