[wxWidgets.git] / src / freetype / winfonts / winfnt.c

/***************************************************************************/
/*                                                                         */
/*  winfnt.c                                                               */
/*                                                                         */
/*    FreeType font driver for Windows FNT/FON files                       */
/*                                                                         */
/*  Copyright 1996-2000 by                                                 */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/


#ifdef FT_FLAT_COMPILE

#include "winfnt.h"

#else

#include <winfonts/winfnt.h>

#endif


#include <freetype/fterrors.h>
#include <freetype/internal/ftstream.h>
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftobjs.h>


  /*************************************************************************/
  /*                                                                       */
  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  /* messages during execution.                                            */
  /*                                                                       */
#undef  FT_COMPONENT
#define FT_COMPONENT  trace_winfnt


  static
  const FT_Frame_Field  winmz_header_fields[] =
  {
    FT_FRAME_START( 64 ),
    FT_FRAME_USHORT_LE ( WinMZ_Header, magic ),
    FT_FRAME_SKIP_BYTES( 29 * 2 ),
    FT_FRAME_ULONG_LE  ( WinMZ_Header, lfanew ),
    FT_FRAME_END
  };

  static
  const FT_Frame_Field  winne_header_fields[] =
  {
    FT_FRAME_START( 40 ),
    FT_FRAME_USHORT_LE ( WinNE_Header, magic ),
    FT_FRAME_SKIP_BYTES( 34 ),
    FT_FRAME_USHORT_LE ( WinNE_Header, resource_tab_offset ),
    FT_FRAME_USHORT_LE ( WinNE_Header, rname_tab_offset ),
    FT_FRAME_END
  };

  static
  const FT_Frame_Field  winfnt_header_fields[] =
  {
    FT_FRAME_START( 134 ),
    FT_FRAME_USHORT_LE( WinFNT_Header, version ),
    FT_FRAME_ULONG_LE ( WinFNT_Header, file_size ),
    FT_FRAME_BYTES    ( WinFNT_Header, copyright, 60 ),
    FT_FRAME_USHORT_LE( WinFNT_Header, file_type ),
    FT_FRAME_USHORT_LE( WinFNT_Header, nominal_point_size ),
    FT_FRAME_USHORT_LE( WinFNT_Header, vertical_resolution ),
    FT_FRAME_USHORT_LE( WinFNT_Header, horizontal_resolution ),
    FT_FRAME_USHORT_LE( WinFNT_Header, ascent ),
    FT_FRAME_USHORT_LE( WinFNT_Header, internal_leading ),
    FT_FRAME_USHORT_LE( WinFNT_Header, external_leading ),
    FT_FRAME_BYTE     ( WinFNT_Header, italic ),
    FT_FRAME_BYTE     ( WinFNT_Header, underline ),
    FT_FRAME_BYTE     ( WinFNT_Header, strike_out ),
    FT_FRAME_USHORT_LE( WinFNT_Header, weight ),
    FT_FRAME_BYTE     ( WinFNT_Header, charset ),
    FT_FRAME_USHORT_LE( WinFNT_Header, pixel_width ),
    FT_FRAME_USHORT_LE( WinFNT_Header, pixel_height ),
    FT_FRAME_BYTE     ( WinFNT_Header, pitch_and_family ),
    FT_FRAME_USHORT_LE( WinFNT_Header, avg_width ),
    FT_FRAME_USHORT_LE( WinFNT_Header, max_width ),
    FT_FRAME_BYTE     ( WinFNT_Header, first_char ),
    FT_FRAME_BYTE     ( WinFNT_Header, last_char ),
    FT_FRAME_BYTE     ( WinFNT_Header, default_char ),
    FT_FRAME_BYTE     ( WinFNT_Header, break_char ),
    FT_FRAME_USHORT_LE( WinFNT_Header, bytes_per_row ),
    FT_FRAME_ULONG_LE ( WinFNT_Header, device_offset ),
    FT_FRAME_ULONG_LE ( WinFNT_Header, face_name_offset ),
    FT_FRAME_ULONG_LE ( WinFNT_Header, bits_pointer ),
    FT_FRAME_ULONG_LE ( WinFNT_Header, bits_offset ),
    FT_FRAME_BYTE     ( WinFNT_Header, reserved ),
    FT_FRAME_ULONG_LE ( WinFNT_Header, flags ),
    FT_FRAME_USHORT_LE( WinFNT_Header, A_space ),
    FT_FRAME_USHORT_LE( WinFNT_Header, B_space ),
    FT_FRAME_USHORT_LE( WinFNT_Header, C_space ),
    FT_FRAME_USHORT_LE( WinFNT_Header, color_table_offset ),
    FT_FRAME_BYTES    ( WinFNT_Header, reserved, 4 ),
    FT_FRAME_END
  };


  static
  void  fnt_done_font( FT_Stream  stream,
                       FNT_Font*  font )
  {
    if ( font->fnt_frame )
      RELEASE_Frame( font->fnt_frame );

    font->fnt_size  = 0;
    font->fnt_frame = 0;
  }


  static
  FT_Error  fnt_load_font( FT_Stream  stream,
                           FNT_Font*  font )
  {
    FT_Error        error;
    WinFNT_Header*  header = &font->header;


    /* first of all, read the FNT header */
    if ( FILE_Seek( font->offset )                   ||
         READ_Fields( winfnt_header_fields, header ) )
      goto Exit;

    /* check header */
    if ( header->version != 0x200 &&
         header->version != 0x300 )
    {
      FT_TRACE2(( "[not a valid FNT file]\n" ));
      error = FT_Err_Unknown_File_Format;
      goto Exit;
    }

    if ( header->file_type & 1 )
    {
      FT_TRACE2(( "can't handle vector FNT fonts\n" ));
      error = FT_Err_Unknown_File_Format;
      goto Exit;
    }

    /* small fixup -- some fonts have the `pixel_width' field set to 0 */
    if ( header->pixel_width == 0 )
      header->pixel_width = header->pixel_height;

    /* this is a FNT file/table, we now extract its frame */
    if ( FILE_Seek( font->offset )                           ||
         EXTRACT_Frame( header->file_size, font->fnt_frame ) )
      goto Exit;

  Exit:
    return error;
  }


  static
  void  fnt_done_fonts( FNT_Face  face )
  {
    FT_Memory  memory = FT_FACE(face)->memory;
    FT_Stream  stream = FT_FACE(face)->stream;
    FNT_Font*  cur    = face->fonts;
    FNT_Font*  limit  = cur + face->num_fonts;


    for ( ; cur < limit; cur++ )
      fnt_done_font( stream, cur );

    FREE( face->fonts );
    face->num_fonts = 0;
  }

  static
  FT_Error  fnt_get_dll_fonts( FNT_Face  face )
  {
    FT_Error      error;
    FT_Stream     stream = FT_FACE(face)->stream;
    FT_Memory     memory = FT_FACE(face)->memory;
    WinMZ_Header  mz_header;


    face->fonts     = 0;
    face->num_fonts = 0;

    /* does it begin with a MZ header? */
    if ( FILE_Seek( 0 )                                 ||
         READ_Fields( winmz_header_fields, &mz_header ) )
      goto Exit;

    error = FT_Err_Unknown_File_Format;
    if ( mz_header.magic == WINFNT_MZ_MAGIC )
    {
      /* yes, now look for a NE header in the file */
      WinNE_Header  ne_header;


      if ( FILE_Seek( mz_header.lfanew )                  ||
           READ_Fields( winne_header_fields, &ne_header ) )
        goto Exit;

      error = FT_Err_Unknown_File_Format;
      if ( ne_header.magic == WINFNT_NE_MAGIC )
      {
        /* good, now look in the resource table for each FNT resource */
        FT_ULong   res_offset = mz_header.lfanew +
                                ne_header.resource_tab_offset;

        FT_UShort  size_shift;
        FT_UShort  font_count  = 0;
        FT_ULong   font_offset = 0;


        if ( FILE_Seek( res_offset ) ||
             ACCESS_Frame( ne_header.rname_tab_offset -
                           ne_header.resource_tab_offset ) )
          goto Exit;

        size_shift = GET_UShortLE();

        for (;;)
        {
          FT_UShort  type_id, count;


          type_id = GET_UShortLE();
          if ( !type_id )
            break;

          count = GET_UShortLE();

          if ( type_id == 0x8008 )
          {
            font_count  = count;
            font_offset = FILE_Pos() + 4 + ( stream->cursor - stream->limit );
            break;
          }

          stream->cursor += 4 + count * 12;
        }
        FORGET_Frame();

        if ( !font_count || !font_offset )
        {
          FT_TRACE2(( "this file doesn't contain any FNT resources!\n" ));
          error = FT_Err_Unknown_File_Format;
          goto Exit;
        }

        if ( FILE_Seek( font_offset )                         ||
             ALLOC_ARRAY( face->fonts, font_count, FNT_Font ) )
          goto Exit;

        face->num_fonts = font_count;

        if ( ACCESS_Frame( (FT_Long)font_count * 12 ) )
          goto Exit;

        /* now read the offset and position of each FNT font */
        {
          FNT_Font*  cur   = face->fonts;
          FNT_Font*  limit = cur + font_count;


          for ( ; cur < limit; cur++ )
          {
            cur->offset     = (FT_ULong)GET_UShortLE() << size_shift;
            cur->fnt_size   = (FT_ULong)GET_UShortLE() << size_shift;
            cur->size_shift = size_shift;
            stream->cursor += 8;
          }
        }
        FORGET_Frame();

        /* finally, try to load each font there */
        {
          FNT_Font*  cur   = face->fonts;
          FNT_Font*  limit = cur + font_count;


          for ( ; cur < limit; cur++ )
          {
            error = fnt_load_font( stream, cur );
            if ( error )
              goto Fail;
          }
        }
      }
    }

  Fail:
    if ( error )
      fnt_done_fonts( face );

  Exit:
    return error;
  }


  static
  void  FNT_Done_Face( FNT_Face  face )
  {
    FT_Memory  memory = FT_FACE_MEMORY( face );


    fnt_done_fonts( face );

    FREE( face->root.available_sizes );
    face->root.num_fixed_sizes = 0;
  }


  static
  FT_Error  FNT_Init_Face( FT_Stream      stream,
                           FNT_Face       face,
                           FT_Int         face_index,
                           FT_Int         num_params,
                           FT_Parameter*  params )
  {
    FT_Error   error;
    FT_Memory  memory = FT_FACE_MEMORY( face );

    FT_UNUSED( num_params );
    FT_UNUSED( params );
    FT_UNUSED( face_index );


    /* try to load several fonts from a DLL */
    error = fnt_get_dll_fonts( face );
    if ( error )
    {
      /* this didn't work, now try to load a single FNT font */
      FT_Memory  memory = FT_FACE_MEMORY( face );
      FNT_Font*  font;

      if ( ALLOC( face->fonts, sizeof ( *face->fonts ) ) )
        goto Exit;

      face->num_fonts = 1;
      font            = face->fonts;

      font->offset   = 0;
      font->fnt_size = stream->size;

      error = fnt_load_font( stream, font );
      if ( error )
        goto Fail;
    }

    /* all right, one or more fonts were loaded; we now need to */
    /* fill the root FT_Face fields with relevant information   */
    {
      FT_Face    root  = FT_FACE( face );
      FNT_Font*  fonts = face->fonts;
      FNT_Font*  limit = fonts + face->num_fonts;
      FNT_Font*  cur;


      root->num_faces  = 1;
      root->face_flags = FT_FACE_FLAG_FIXED_SIZES |
                         FT_FACE_FLAG_HORIZONTAL;

      if ( fonts->header.avg_width == fonts->header.max_width )
        root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;

      if ( fonts->header.italic )
        root->style_flags |= FT_STYLE_FLAG_ITALIC;

      if ( fonts->header.weight >= 800 )
        root->style_flags |= FT_STYLE_FLAG_BOLD;

      /* Setup the `fixed_sizes' array */
      if ( ALLOC_ARRAY( root->available_sizes, face->num_fonts,
                        FT_Bitmap_Size ) )
        goto Fail;

      root->num_fixed_sizes = face->num_fonts;

      {
        FT_Bitmap_Size*  size = root->available_sizes;


        for ( cur = fonts; cur < limit; cur++, size++ )
        {
          size->width  = cur->header.pixel_width;
          size->height = cur->header.pixel_height;
        }
      }

      /* Setup the `charmaps' array */
      root->charmaps     = &face->charmap_handle;
      root->num_charmaps = 1;

      face->charmap.encoding    = ft_encoding_unicode;
      face->charmap.platform_id = 3;
      face->charmap.encoding_id = 1;
      face->charmap.face        = root;

      face->charmap_handle = &face->charmap;

      root->charmap = face->charmap_handle;

      /* setup remaining flags */
      root->num_glyphs = fonts->header.last_char -
                         fonts->header.first_char + 1;

      root->family_name = (FT_String*)fonts->fnt_frame +
                          fonts->header.face_name_offset;
      root->style_name  = "Regular";

      if ( root->style_flags & FT_STYLE_FLAG_BOLD )
      {
        if ( root->style_flags & FT_STYLE_FLAG_ITALIC )
          root->style_name = "Bold Italic";
        else
          root->style_name = "Bold";
      }
      else if ( root->style_flags & FT_STYLE_FLAG_ITALIC )
        root->style_name = "Italic";
    }

  Fail:
    if ( error )
      FNT_Done_Face( face );

  Exit:
    return error;
  }


  static
  FT_Error  FNT_Set_Pixel_Size( FNT_Size  size )
  {
    /* look up a font corresponding to the current pixel size */
    FNT_Face   face  = (FNT_Face)FT_SIZE_FACE( size );
    FNT_Font*  cur   = face->fonts;
    FNT_Font*  limit = cur + face->num_fonts;


    size->font = 0;
    for ( ; cur < limit; cur++ )
    {
      /* we only compare the character height, as fonts used some strange */
      /* values                                                           */
      if ( cur->header.pixel_height == size->root.metrics.y_ppem )
      {
        size->font = cur;
        
        size->root.metrics.ascender  = cur->header.ascent * 64;
        size->root.metrics.descender = ( cur->header.pixel_height -
                                           cur->header.ascent ) * 64;
        size->root.metrics.height    = cur->header.pixel_height * 64;
        break;
      }
    }

    return ( size->font ? FT_Err_Ok : FT_Err_Invalid_Argument );
  }


  static
  FT_UInt  FNT_Get_Char_Index( FT_CharMap  charmap,
                               FT_ULong    char_code )
  {
    FT_UInt  result = char_code;


    if ( charmap )
    {
      FNT_Font*  font  = ((FNT_Face)charmap->face)->fonts;
      FT_UInt    first = font->header.first_char;
      FT_UInt    count = font->header.last_char - first + 1;


      char_code -= first;
      if ( char_code < count )
        result = char_code + 1;
      else
        result = 0;
    }

    return result;
  }


  static
  FT_Error  FNT_Load_Glyph( FT_GlyphSlot  slot,
                            FNT_Size      size,
                            FT_UInt       glyph_index,
                            FT_Int        load_flags )
  {
    FNT_Font*   font  = size->font;
    FT_Error    error = 0;
    FT_Byte*    p;
    FT_Int      len;
    FT_Bitmap*  bitmap = &slot->bitmap;
    FT_ULong    offset;
    FT_Bool     new_format;

    FT_UNUSED( slot );
    FT_UNUSED( load_flags );


    if ( !font )
    {
      error = FT_Err_Invalid_Argument;
      goto Exit;
    }

    if ( glyph_index > 0 )
      glyph_index--;
    else
      glyph_index = font->header.default_char - font->header.first_char;
      
    new_format = font->header.version == 0x300;
    len        = new_format ? 6 : 4;

    /* jump to glyph entry */
    p = font->fnt_frame + 118 + len * glyph_index;

    bitmap->width = NEXT_ShortLE(p);

    if ( new_format )
      offset = NEXT_ULongLE(p);
    else
      offset = NEXT_UShortLE(p);

    /* jump to glyph data */
    p = font->fnt_frame + /* font->header.bits_offset */ + offset;

    /* allocate and build bitmap */
    {
      FT_Memory  memory = FT_FACE_MEMORY( slot->face );
      FT_Int     pitch  = ( bitmap->width + 7 ) >> 3;
      FT_Byte*   column;
      FT_Byte*   write;


      bitmap->pitch      = pitch;
      bitmap->rows       = font->header.pixel_height;
      bitmap->pixel_mode = ft_pixel_mode_mono;

      if ( ALLOC( bitmap->buffer, pitch * bitmap->rows ) )
        goto Exit;

      column = (FT_Byte*)bitmap->buffer;

      for ( ; pitch > 0; pitch--, column++ )
      {
        FT_Byte*  limit = p + bitmap->rows;


        for ( write = column; p < limit; p++, write += bitmap->pitch )
          write[0] = p[0];
      }
    }

    slot->flags       = ft_glyph_own_bitmap;
    slot->bitmap_left = 0;
    slot->bitmap_top  = font->header.ascent;
    slot->format      = ft_glyph_format_bitmap;

    /* now set up metrics */
    slot->metrics.horiAdvance  = bitmap->width << 6;
    slot->metrics.horiBearingX = 0;
    slot->metrics.horiBearingY = slot->bitmap_top << 6;

    slot->linearHoriAdvance    = (FT_Fixed)bitmap->width << 16;

  Exit:
    return error;
  }


  const FT_Driver_Class  winfnt_driver_class =
  {
    {
      ft_module_font_driver,
      sizeof ( FT_DriverRec ),

      "winfonts",
      0x10000L,
      0x20000L,

      0,

      (FT_Module_Constructor)0,
      (FT_Module_Destructor) 0,
      (FT_Module_Requester)  0
    },

    sizeof( FNT_FaceRec ),
    sizeof( FNT_SizeRec ),
    sizeof( FT_GlyphSlotRec ),

    (FTDriver_initFace)     FNT_Init_Face,
    (FTDriver_doneFace)     FNT_Done_Face,
    (FTDriver_initSize)     0,
    (FTDriver_doneSize)     0,
    (FTDriver_initGlyphSlot)0,
    (FTDriver_doneGlyphSlot)0,

    (FTDriver_setCharSizes) FNT_Set_Pixel_Size,
    (FTDriver_setPixelSizes)FNT_Set_Pixel_Size,

    (FTDriver_loadGlyph)    FNT_Load_Glyph,
    (FTDriver_getCharIndex) FNT_Get_Char_Index,

    (FTDriver_getKerning)   0,
    (FTDriver_attachFile)   0,
    (FTDriver_getAdvances)  0
  };


/* END */
Commit	Line	Data
cabec872 RR	1	/***************************************************************************/
	2	/* */
	3	/* winfnt.c */
	4	/* */
	5	/* FreeType font driver for Windows FNT/FON files */
	6	/* */
	7	/* Copyright 1996-2000 by */
	8	/* David Turner, Robert Wilhelm, and Werner Lemberg. */
	9	/* */
	10	/* This file is part of the FreeType project, and may only be used, */
	11	/* modified, and distributed under the terms of the FreeType project */
	12	/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
	13	/* this file you indicate that you have read the license and */
	14	/* understand and accept it fully. */
	15	/* */
	16	/***************************************************************************/
	17
	18
	19	#ifdef FT_FLAT_COMPILE
	20
	21	#include "winfnt.h"
	22
	23	#else
	24
	25	#include <winfonts/winfnt.h>
	26
	27	#endif
	28
	29
	30	#include <freetype/fterrors.h>
	31	#include <freetype/internal/ftstream.h>
	32	#include <freetype/internal/ftdebug.h>
	33	#include <freetype/internal/ftobjs.h>
	34
	35
	36	/*************************************************************************/
	37	/* */
	38	/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
	39	/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
	40	/* messages during execution. */
	41	/* */
	42	#undef FT_COMPONENT
	43	#define FT_COMPONENT trace_winfnt
	44
	45
	46	static
	47	const FT_Frame_Field winmz_header_fields[] =
	48	{
	49	FT_FRAME_START( 64 ),
	50	FT_FRAME_USHORT_LE ( WinMZ_Header, magic ),
	51	FT_FRAME_SKIP_BYTES( 29 * 2 ),
	52	FT_FRAME_ULONG_LE ( WinMZ_Header, lfanew ),
	53	FT_FRAME_END
	54	};
	55
	56	static
	57	const FT_Frame_Field winne_header_fields[] =
	58	{
	59	FT_FRAME_START( 40 ),
	60	FT_FRAME_USHORT_LE ( WinNE_Header, magic ),
	61	FT_FRAME_SKIP_BYTES( 34 ),
	62	FT_FRAME_USHORT_LE ( WinNE_Header, resource_tab_offset ),
	63	FT_FRAME_USHORT_LE ( WinNE_Header, rname_tab_offset ),
	64	FT_FRAME_END
65	};
66
67	static
68	const FT_Frame_Field winfnt_header_fields[] =
69	{
70	FT_FRAME_START( 134 ),
71	FT_FRAME_USHORT_LE( WinFNT_Header, version ),
72	FT_FRAME_ULONG_LE ( WinFNT_Header, file_size ),
73	FT_FRAME_BYTES ( WinFNT_Header, copyright, 60 ),
74	FT_FRAME_USHORT_LE( WinFNT_Header, file_type ),
75	FT_FRAME_USHORT_LE( WinFNT_Header, nominal_point_size ),
76	FT_FRAME_USHORT_LE( WinFNT_Header, vertical_resolution ),
77	FT_FRAME_USHORT_LE( WinFNT_Header, horizontal_resolution ),
78	FT_FRAME_USHORT_LE( WinFNT_Header, ascent ),
79	FT_FRAME_USHORT_LE( WinFNT_Header, internal_leading ),
80	FT_FRAME_USHORT_LE( WinFNT_Header, external_leading ),
81	FT_FRAME_BYTE ( WinFNT_Header, italic ),
82	FT_FRAME_BYTE ( WinFNT_Header, underline ),
83	FT_FRAME_BYTE ( WinFNT_Header, strike_out ),
84	FT_FRAME_USHORT_LE( WinFNT_Header, weight ),
85	FT_FRAME_BYTE ( WinFNT_Header, charset ),
86	FT_FRAME_USHORT_LE( WinFNT_Header, pixel_width ),
87	FT_FRAME_USHORT_LE( WinFNT_Header, pixel_height ),
88	FT_FRAME_BYTE ( WinFNT_Header, pitch_and_family ),
89	FT_FRAME_USHORT_LE( WinFNT_Header, avg_width ),
90	FT_FRAME_USHORT_LE( WinFNT_Header, max_width ),
91	FT_FRAME_BYTE ( WinFNT_Header, first_char ),
92	FT_FRAME_BYTE ( WinFNT_Header, last_char ),
93	FT_FRAME_BYTE ( WinFNT_Header, default_char ),
94	FT_FRAME_BYTE ( WinFNT_Header, break_char ),
95	FT_FRAME_USHORT_LE( WinFNT_Header, bytes_per_row ),
96	FT_FRAME_ULONG_LE ( WinFNT_Header, device_offset ),
97	FT_FRAME_ULONG_LE ( WinFNT_Header, face_name_offset ),
98	FT_FRAME_ULONG_LE ( WinFNT_Header, bits_pointer ),
99	FT_FRAME_ULONG_LE ( WinFNT_Header, bits_offset ),
100	FT_FRAME_BYTE ( WinFNT_Header, reserved ),
101	FT_FRAME_ULONG_LE ( WinFNT_Header, flags ),
102	FT_FRAME_USHORT_LE( WinFNT_Header, A_space ),
103	FT_FRAME_USHORT_LE( WinFNT_Header, B_space ),
104	FT_FRAME_USHORT_LE( WinFNT_Header, C_space ),
105	FT_FRAME_USHORT_LE( WinFNT_Header, color_table_offset ),
106	FT_FRAME_BYTES ( WinFNT_Header, reserved, 4 ),
107	FT_FRAME_END
108	};
109
110
111	static
112	void fnt_done_font( FT_Stream stream,
113	FNT_Font* font )
114	{
115	if ( font->fnt_frame )
116	RELEASE_Frame( font->fnt_frame );
117
118	font->fnt_size = 0;
119	font->fnt_frame = 0;
120	}
121
122
123	static
124	FT_Error fnt_load_font( FT_Stream stream,
125	FNT_Font* font )
126	{
127	FT_Error error;
128	WinFNT_Header* header = &font->header;
129
130
131	/* first of all, read the FNT header */
132	if ( FILE_Seek( font->offset ) \|\|
133	READ_Fields( winfnt_header_fields, header ) )
134	goto Exit;
135
136	/* check header */
137	if ( header->version != 0x200 &&
138	header->version != 0x300 )
139	{
140	FT_TRACE2(( "[not a valid FNT file]\n" ));
141	error = FT_Err_Unknown_File_Format;
142	goto Exit;
143	}
144
145	if ( header->file_type & 1 )
146	{
147	FT_TRACE2(( "can't handle vector FNT fonts\n" ));
148	error = FT_Err_Unknown_File_Format;
149	goto Exit;
150	}
151
152	/* small fixup -- some fonts have the `pixel_width' field set to 0 */
153	if ( header->pixel_width == 0 )
154	header->pixel_width = header->pixel_height;
155
156	/* this is a FNT file/table, we now extract its frame */
157	if ( FILE_Seek( font->offset ) \|\|
158	EXTRACT_Frame( header->file_size, font->fnt_frame ) )
159	goto Exit;
160
161	Exit:
162	return error;
163	}
164
165
166	static
167	void fnt_done_fonts( FNT_Face face )
168	{
169	FT_Memory memory = FT_FACE(face)->memory;
170	FT_Stream stream = FT_FACE(face)->stream;
171	FNT_Font* cur = face->fonts;
172	FNT_Font* limit = cur + face->num_fonts;
173
174
175	for ( ; cur < limit; cur++ )
176	fnt_done_font( stream, cur );
177
178	FREE( face->fonts );
179	face->num_fonts = 0;
180	}
181
182	static
183	FT_Error fnt_get_dll_fonts( FNT_Face face )
184	{
185	FT_Error error;
186	FT_Stream stream = FT_FACE(face)->stream;
187	FT_Memory memory = FT_FACE(face)->memory;
188	WinMZ_Header mz_header;
189
190
191	face->fonts = 0;
192	face->num_fonts = 0;
193
194	/* does it begin with a MZ header? */
195	if ( FILE_Seek( 0 ) \|\|
196	READ_Fields( winmz_header_fields, &mz_header ) )
197	goto Exit;
198
199	error = FT_Err_Unknown_File_Format;
200	if ( mz_header.magic == WINFNT_MZ_MAGIC )
201	{
202	/* yes, now look for a NE header in the file */
203	WinNE_Header ne_header;
204
205
206	if ( FILE_Seek( mz_header.lfanew ) \|\|
207	READ_Fields( winne_header_fields, &ne_header ) )
208	goto Exit;
209
210	error = FT_Err_Unknown_File_Format;
211	if ( ne_header.magic == WINFNT_NE_MAGIC )
212	{
213	/* good, now look in the resource table for each FNT resource */
214	FT_ULong res_offset = mz_header.lfanew +
215	ne_header.resource_tab_offset;
216
217	FT_UShort size_shift;
218	FT_UShort font_count = 0;
219	FT_ULong font_offset = 0;
220
221
222	if ( FILE_Seek( res_offset ) \|\|
223	ACCESS_Frame( ne_header.rname_tab_offset -
224	ne_header.resource_tab_offset ) )
225	goto Exit;
226
227	size_shift = GET_UShortLE();
228
229	for (;;)
230	{
231	FT_UShort type_id, count;
232
233
234	type_id = GET_UShortLE();
235	if ( !type_id )
236	break;
237
238	count = GET_UShortLE();
239
240	if ( type_id == 0x8008 )
241	{
242	font_count = count;
243	font_offset = FILE_Pos() + 4 + ( stream->cursor - stream->limit );
244	break;
245	}
246
247	stream->cursor += 4 + count * 12;
248	}
249	FORGET_Frame();
250
251	if ( !font_count \|\| !font_offset )
252	{
253	FT_TRACE2(( "this file doesn't contain any FNT resources!\n" ));
254	error = FT_Err_Unknown_File_Format;
255	goto Exit;
256	}
257
258	if ( FILE_Seek( font_offset ) \|\|
259	ALLOC_ARRAY( face->fonts, font_count, FNT_Font ) )
260	goto Exit;
261
262	face->num_fonts = font_count;
263
264	if ( ACCESS_Frame( (FT_Long)font_count * 12 ) )
265	goto Exit;
266
267	/* now read the offset and position of each FNT font */
268	{
269	FNT_Font* cur = face->fonts;
270	FNT_Font* limit = cur + font_count;
271
272
273	for ( ; cur < limit; cur++ )
274	{
275	cur->offset = (FT_ULong)GET_UShortLE() << size_shift;
276	cur->fnt_size = (FT_ULong)GET_UShortLE() << size_shift;
277	cur->size_shift = size_shift;
278	stream->cursor += 8;
279	}
280	}
281	FORGET_Frame();
282
283	/* finally, try to load each font there */
284	{
285	FNT_Font* cur = face->fonts;
286	FNT_Font* limit = cur + font_count;
287
288
289	for ( ; cur < limit; cur++ )
290	{
291	error = fnt_load_font( stream, cur );
292	if ( error )
293	goto Fail;
294	}
295	}
296	}
297	}
298
299	Fail:
300	if ( error )
301	fnt_done_fonts( face );
302
303	Exit:
304	return error;
305	}
306
307
308	static
309	void FNT_Done_Face( FNT_Face face )
310	{
311	FT_Memory memory = FT_FACE_MEMORY( face );
312
313
314	fnt_done_fonts( face );
315
316	FREE( face->root.available_sizes );
317	face->root.num_fixed_sizes = 0;
318	}
319
320
321	static
322	FT_Error FNT_Init_Face( FT_Stream stream,
323	FNT_Face face,
324	FT_Int face_index,
325	FT_Int num_params,
326	FT_Parameter* params )
327	{
328	FT_Error error;
329	FT_Memory memory = FT_FACE_MEMORY( face );
330
331	FT_UNUSED( num_params );
332	FT_UNUSED( params );
333	FT_UNUSED( face_index );
334
335
336	/* try to load several fonts from a DLL */
337	error = fnt_get_dll_fonts( face );
338	if ( error )
339	{
340	/* this didn't work, now try to load a single FNT font */
341	FT_Memory memory = FT_FACE_MEMORY( face );
342	FNT_Font* font;
343
344	if ( ALLOC( face->fonts, sizeof ( *face->fonts ) ) )
345	goto Exit;
346
347	face->num_fonts = 1;
348	font = face->fonts;
349
350	font->offset = 0;
351	font->fnt_size = stream->size;
352
353	error = fnt_load_font( stream, font );
354	if ( error )
355	goto Fail;
356	}
357
358	/* all right, one or more fonts were loaded; we now need to */
359	/* fill the root FT_Face fields with relevant information */
360	{
361	FT_Face root = FT_FACE( face );
362	FNT_Font* fonts = face->fonts;
363	FNT_Font* limit = fonts + face->num_fonts;
364	FNT_Font* cur;
365
366
367	root->num_faces = 1;
368	root->face_flags = FT_FACE_FLAG_FIXED_SIZES \|
369	FT_FACE_FLAG_HORIZONTAL;
370
371	if ( fonts->header.avg_width == fonts->header.max_width )
372	root->face_flags \|= FT_FACE_FLAG_FIXED_WIDTH;
373
374	if ( fonts->header.italic )
375	root->style_flags \|= FT_STYLE_FLAG_ITALIC;
376
377	if ( fonts->header.weight >= 800 )
378	root->style_flags \|= FT_STYLE_FLAG_BOLD;
379
380	/* Setup the `fixed_sizes' array */
381	if ( ALLOC_ARRAY( root->available_sizes, face->num_fonts,
382	FT_Bitmap_Size ) )
383	goto Fail;
384
385	root->num_fixed_sizes = face->num_fonts;
386
387	{
388	FT_Bitmap_Size* size = root->available_sizes;
389
390
391	for ( cur = fonts; cur < limit; cur++, size++ )
392	{
393	size->width = cur->header.pixel_width;
394	size->height = cur->header.pixel_height;
395	}
396	}
397
398	/* Setup the `charmaps' array */
399	root->charmaps = &face->charmap_handle;
400	root->num_charmaps = 1;
401
402	face->charmap.encoding = ft_encoding_unicode;
403	face->charmap.platform_id = 3;
404	face->charmap.encoding_id = 1;
405	face->charmap.face = root;
406
407	face->charmap_handle = &face->charmap;
408
409	root->charmap = face->charmap_handle;
410
411	/* setup remaining flags */
412	root->num_glyphs = fonts->header.last_char -
413	fonts->header.first_char + 1;
414
415	root->family_name = (FT_String*)fonts->fnt_frame +
416	fonts->header.face_name_offset;
417	root->style_name = "Regular";
418
419	if ( root->style_flags & FT_STYLE_FLAG_BOLD )
420	{
421	if ( root->style_flags & FT_STYLE_FLAG_ITALIC )
422	root->style_name = "Bold Italic";
423	else
424	root->style_name = "Bold";
425	}
426	else if ( root->style_flags & FT_STYLE_FLAG_ITALIC )
427	root->style_name = "Italic";
428	}
429
430	Fail:
431	if ( error )
432	FNT_Done_Face( face );
433
434	Exit:
435	return error;
436	}
437
438
439	static
440	FT_Error FNT_Set_Pixel_Size( FNT_Size size )
441	{
442	/* look up a font corresponding to the current pixel size */
443	FNT_Face face = (FNT_Face)FT_SIZE_FACE( size );
444	FNT_Font* cur = face->fonts;
445	FNT_Font* limit = cur + face->num_fonts;
446
447
448	size->font = 0;
449	for ( ; cur < limit; cur++ )
450	{
451	/* we only compare the character height, as fonts used some strange */
452	/* values */
453	if ( cur->header.pixel_height == size->root.metrics.y_ppem )
454	{
455	size->font = cur;
456
457	size->root.metrics.ascender = cur->header.ascent * 64;
458	size->root.metrics.descender = ( cur->header.pixel_height -
459	cur->header.ascent ) * 64;
460	size->root.metrics.height = cur->header.pixel_height * 64;
461	break;
462	}
463	}
464
465	return ( size->font ? FT_Err_Ok : FT_Err_Invalid_Argument );
466	}
467
468
469	static
470	FT_UInt FNT_Get_Char_Index( FT_CharMap charmap,
471	FT_ULong char_code )
472	{
473	FT_UInt result = char_code;
474
475
476	if ( charmap )
477	{
478	FNT_Font* font = ((FNT_Face)charmap->face)->fonts;
479	FT_UInt first = font->header.first_char;
480	FT_UInt count = font->header.last_char - first + 1;
481
482
483	char_code -= first;
484	if ( char_code < count )
485	result = char_code + 1;
486	else
487	result = 0;
488	}
489
490	return result;
491	}
492
493
494	static
495	FT_Error FNT_Load_Glyph( FT_GlyphSlot slot,
496	FNT_Size size,
497	FT_UInt glyph_index,
498	FT_Int load_flags )
499	{
500	FNT_Font* font = size->font;
501	FT_Error error = 0;
502	FT_Byte* p;
503	FT_Int len;
504	FT_Bitmap* bitmap = &slot->bitmap;
505	FT_ULong offset;
506	FT_Bool new_format;
507
508	FT_UNUSED( slot );
509	FT_UNUSED( load_flags );
510
511
512	if ( !font )
513	{
514	error = FT_Err_Invalid_Argument;
515	goto Exit;
516	}
517
518	if ( glyph_index > 0 )
519	glyph_index--;
520	else
521	glyph_index = font->header.default_char - font->header.first_char;
522
523	new_format = font->header.version == 0x300;
524	len = new_format ? 6 : 4;
525
526	/* jump to glyph entry */
527	p = font->fnt_frame + 118 + len * glyph_index;
528
529	bitmap->width = NEXT_ShortLE(p);
530
531	if ( new_format )
532	offset = NEXT_ULongLE(p);
533	else
534	offset = NEXT_UShortLE(p);
535
536	/* jump to glyph data */
537	p = font->fnt_frame + /* font->header.bits_offset */ + offset;
538
539	/* allocate and build bitmap */
540	{
541	FT_Memory memory = FT_FACE_MEMORY( slot->face );
542	FT_Int pitch = ( bitmap->width + 7 ) >> 3;
543	FT_Byte* column;
544	FT_Byte* write;
545
546
547	bitmap->pitch = pitch;
548	bitmap->rows = font->header.pixel_height;
549	bitmap->pixel_mode = ft_pixel_mode_mono;
550
551	if ( ALLOC( bitmap->buffer, pitch * bitmap->rows ) )
552	goto Exit;
553
554	column = (FT_Byte*)bitmap->buffer;
555
556	for ( ; pitch > 0; pitch--, column++ )
557	{
558	FT_Byte* limit = p + bitmap->rows;
559
560
561	for ( write = column; p < limit; p++, write += bitmap->pitch )
562	write[0] = p[0];
563	}
564	}
565
566	slot->flags = ft_glyph_own_bitmap;
567	slot->bitmap_left = 0;
568	slot->bitmap_top = font->header.ascent;
569	slot->format = ft_glyph_format_bitmap;
570
571	/* now set up metrics */
572	slot->metrics.horiAdvance = bitmap->width << 6;
573	slot->metrics.horiBearingX = 0;
574	slot->metrics.horiBearingY = slot->bitmap_top << 6;
575
576	slot->linearHoriAdvance = (FT_Fixed)bitmap->width << 16;
577
578	Exit:
579	return error;
580	}
581
582
583	const FT_Driver_Class winfnt_driver_class =
584	{
585	{
586	ft_module_font_driver,
587	sizeof ( FT_DriverRec ),
588
589	"winfonts",
590	0x10000L,
591	0x20000L,
592
593	0,
594
595	(FT_Module_Constructor)0,
596	(FT_Module_Destructor) 0,
597	(FT_Module_Requester) 0
598	},
599
600	sizeof( FNT_FaceRec ),
601	sizeof( FNT_SizeRec ),
602	sizeof( FT_GlyphSlotRec ),
603
604	(FTDriver_initFace) FNT_Init_Face,
605	(FTDriver_doneFace) FNT_Done_Face,
606	(FTDriver_initSize) 0,
607	(FTDriver_doneSize) 0,
608	(FTDriver_initGlyphSlot)0,
609	(FTDriver_doneGlyphSlot)0,
610
611	(FTDriver_setCharSizes) FNT_Set_Pixel_Size,
612	(FTDriver_setPixelSizes)FNT_Set_Pixel_Size,
613
614	(FTDriver_loadGlyph) FNT_Load_Glyph,
615	(FTDriver_getCharIndex) FNT_Get_Char_Index,
616
617	(FTDriver_getKerning) 0,
618	(FTDriver_attachFile) 0,
619	(FTDriver_getAdvances) 0
620	};
621
622
623	/* END */