winfnt.c

qt-embedded-2.3.8.tar.gz源码

/***************************************************************************/
/*                                                                         */
/*  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>
#include <freetype/internal/fnttypes.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[] =
  {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  WinMZ_Header

    FT_FRAME_START( 64 ),
      FT_FRAME_USHORT_LE ( magic ),
      FT_FRAME_SKIP_BYTES( 29 * 2 ),
      FT_FRAME_ULONG_LE  ( lfanew ),
    FT_FRAME_END
  };

  static
  const FT_Frame_Field  winne_header_fields[] =
  {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  WinNE_Header

    FT_FRAME_START( 40 ),
      FT_FRAME_USHORT_LE ( magic ),
      FT_FRAME_SKIP_BYTES( 34 ),
      FT_FRAME_USHORT_LE ( resource_tab_offset ),
      FT_FRAME_USHORT_LE ( rname_tab_offset ),
    FT_FRAME_END
  };

  static
  const FT_Frame_Field  winfnt_header_fields[] =
  {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  WinFNT_Header

    FT_FRAME_START( 134 ),
      FT_FRAME_USHORT_LE( version ),
      FT_FRAME_ULONG_LE ( file_size ),
      FT_FRAME_BYTES    ( copyright, 60 ),
      FT_FRAME_USHORT_LE( file_type ),
      FT_FRAME_USHORT_LE( nominal_point_size ),
      FT_FRAME_USHORT_LE( vertical_resolution ),
      FT_FRAME_USHORT_LE( horizontal_resolution ),
      FT_FRAME_USHORT_LE( ascent ),
      FT_FRAME_USHORT_LE( internal_leading ),
      FT_FRAME_USHORT_LE( external_leading ),
      FT_FRAME_BYTE     ( italic ),
      FT_FRAME_BYTE     ( underline ),
      FT_FRAME_BYTE     ( strike_out ),
      FT_FRAME_USHORT_LE( weight ),
      FT_FRAME_BYTE     ( charset ),
      FT_FRAME_USHORT_LE( pixel_width ),
      FT_FRAME_USHORT_LE( pixel_height ),
      FT_FRAME_BYTE     ( pitch_and_family ),
      FT_FRAME_USHORT_LE( avg_width ),
      FT_FRAME_USHORT_LE( max_width ),
      FT_FRAME_BYTE     ( first_char ),
      FT_FRAME_BYTE     ( last_char ),
      FT_FRAME_BYTE     ( default_char ),
      FT_FRAME_BYTE     ( break_char ),
      FT_FRAME_USHORT_LE( bytes_per_row ),
      FT_FRAME_ULONG_LE ( device_offset ),
      FT_FRAME_ULONG_LE ( face_name_offset ),
      FT_FRAME_ULONG_LE ( bits_pointer ),
      FT_FRAME_ULONG_LE ( bits_offset ),
      FT_FRAME_BYTE     ( reserved ),
      FT_FRAME_ULONG_LE ( flags ),
      FT_FRAME_USHORT_LE( A_space ),
      FT_FRAME_USHORT_LE( B_space ),
      FT_FRAME_USHORT_LE( C_space ),
      FT_FRAME_USHORT_LE( color_table_offset ),
      FT_FRAME_BYTES    ( 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,