ttobjs.c

Qt/Embedded是一个多平台的C++图形用户界面应用程序框架

/***************************************************************************/
/*                                                                         */
/*  ttobjs.c                                                               */
/*                                                                         */
/*    Objects manager (body).                                              */
/*                                                                         */
/*  Copyright 1996-1999 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.                                        */
/*                                                                         */
/***************************************************************************/


#include <freetype.h>
#include <ftdebug.h>
#include <ftcalc.h>
#include <ftstream.h>
#include <ttnameid.h>
#include <tttags.h>

#include <sfnt.h>
#include <psnames.h>
#include <ttobjs.h>

#include <ttpload.h>
#include <tterrors.h>

#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
#include <ttinterp.h>
#endif

/* required by tracing mode */
#undef   FT_COMPONENT
#define  FT_COMPONENT  trace_ttobjs


  /*************************************************************************/
  /*                                                                       */
  /*                       GLYPH ZONE FUNCTIONS                            */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    Get_Name                                                           */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Returns a given ENGLISH name record in ASCII.                      */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face   :: A handle to the source face object.                      */
  /*                                                                       */
  /*    nameid :: The name id of the name record to return.                */
  /*                                                                       */
  /* <Return>                                                              */
  /*    Char string.  NULL if no name is present.                          */
  /*                                                                       */
  static
  FT_String*  Get_Name( TT_Face    face,
                        TT_UShort  nameid )
  {
    FT_Memory    memory = face->root.memory;
    TT_UShort    n;
    TT_NameRec*  rec;
    TT_Bool      wide_chars = 1;

    /* first pass, look for a given name record */
    rec = face->name_table.names;
    for ( n = 0; n < face->name_table.numNameRecords; n++, rec++ )
    {
      if ( rec->nameID == nameid )
      {
        /* found the name - now create an ASCII string from it */
        TT_Bool  found = 0;

        /* Test for Microsoft English language */
        if ( rec->platformID == TT_PLATFORM_MICROSOFT &&
             rec->encodingID <= TT_MS_ID_UNICODE_CS   &&
             (rec->languageID & 0x3FF) == 0x009 )
          found = 1;

        /* Test for Apple Unicode encoding */
        else if ( rec->platformID == TT_PLATFORM_APPLE_UNICODE )
          found = 1;
        
        /* Test for Apple Roman */
        else if ( rec->platformID == TT_PLATFORM_MACINTOSH &&
                  rec->languageID == TT_MAC_ID_ROMAN       )
        {
          found      = 1;
          wide_chars = 0;
        }

        /* Found a Unicode Name */
        if ( found )
        {
          TT_String*  string;
          TT_UInt     len;

          if ( wide_chars )
          {
            TT_UInt   m;
            
            len = (TT_UInt)rec->stringLength / 2;
            if ( MEM_Alloc( string, len + 1 ) )
              return NULL;
    
            for ( m = 0; m < len; m ++ )
              string[m] = rec->string[2*m + 1];
          }
          else
          {
            len = rec->stringLength;
            if ( MEM_Alloc( string, len + 1 ) )
              return NULL;

            MEM_Copy( string, rec->string, len );
          }

          string[len] = '\0';
          return string;
        }
      }
    }
    return NULL;
  }


#undef  LOAD_
#define LOAD_(x)   ( (error = sfnt->load_##x( face, stream )) != TT_Err_Ok )


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Init_Face                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Initializes a given TrueType face object.                          */
  /*                                                                       */
  /* <Input>                                                               */
  /*    resource   :: The source font resource.                            */
  /*    face_index :: The index of the font face in the resource.          */
  /*    face       :: The newly built face object.                         */
  /*                                                                       */
  /* <Return>                                                              */
  /*    TrueType error code.  0 means success.                             */
  /*                                                                       */
  LOCAL_DEF
  TT_Error  TT_Init_Face( FT_Stream  stream,
                          TT_Long    face_index,
                          TT_Face    face )
  {
    TT_Error           error;
    TT_ULong           format_tag;
    SFNT_Interface*    sfnt;
    PSNames_Interface* psnames;

    sfnt = (SFNT_Interface*)face->sfnt;
    if (!sfnt)
    {
      /* look-up the SFNT driver */
      FT_Driver  sfnt_driver;
      
      sfnt_driver = FT_Get_Driver( face->root.driver->library, "sfnt" );
      if (!sfnt_driver)
        return FT_Err_Invalid_File_Format;
        
      sfnt = (SFNT_Interface*)(sfnt_driver->interface.format_interface);
      if (!sfnt)
        return FT_Err_Invalid_File_Format;
        
      face->sfnt       = sfnt;
      face->goto_table = sfnt->goto_table;
    }
    
    psnames = (PSNames_Interface*)face->psnames;
    if (!psnames)
    {
      /* look-up the PSNames driver */
      FT_Driver  psnames_driver;
      
      psnames_driver = FT_Get_Driver( face->root.driver->library, "psnames" );
      if (psnames_driver)
        face->psnames = (PSNames_Interface*)
                            (psnames_driver->interface.format_interface);
    }
    
    /* create input stream from resource */
    if ( FILE_Seek(0) )
      goto Exit;

    /* check that we have a valid TrueType file */
    error = sfnt->load_format_tag( face, stream, face_index, &format_tag );
    if (error) goto Exit;
    
    /* We must also be able to accept Mac/GX fonts, as well as OT ones */
    if ( format_tag != 0x00010000 &&    /* MS fonts  */
         format_tag != TTAG_true  )     /* Mac fonts */
    {
      FT_TRACE2(( "[not a valid TTF font]" ));
      error = TT_Err_Invalid_File_Format;
      goto Exit;
    }

    /* Load font directory */
    error = sfnt->load_directory( face, stream, face_index );
    if ( error ) goto Exit;

    face->root.num_faces = face->ttc_header.DirCount;
    if ( face->root.num_faces < 1 )
      face->root.num_faces = 1;

    /* If we're performing a simple font format check, exit immediately */
    if ( face_index < 0 )
      return TT_Err_Ok;

    /* Load tables */

    if ( LOAD_( header )        ||
         LOAD_( max_profile )   ||

         (error = sfnt->load_metrics( face, stream, 0 )) != TT_Err_Ok  ||
         /* load the `hhea' & `hmtx' tables at once */

         (error = sfnt->load_metrics( face, stream, 1 )) != TT_Err_Ok ||
         /* try to load the `vhea' & `vmtx' at once if present */

         LOAD_( charmaps )      ||
         LOAD_( names )         ||
         LOAD_( os2 )           ||
         LOAD_( psnames )       )
     goto Exit;

    /* the optional tables */
    
    /* embedded bitmap support. */
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
    if (sfnt->load_sbits && LOAD_(sbits)) goto Exit;
#endif

    if ( LOAD_( hdmx )          ||
         LOAD_( gasp )          ||
         LOAD_( kerning )       ||

         (error = TT_Load_Locations( face, stream )) != TT_Err_Ok ||
         (error = TT_Load_CVT      ( face, stream )) != TT_Err_Ok ||
         (error = TT_Load_Programs ( face, stream )) != TT_Err_Ok )

      goto Exit;

#ifdef TT_CONFIG_OPTION_EXTEND_ENGINE
    if ( ( error = TT_Extension_Create( face ) ) != TT_Err_Ok )
      goto Exit;
#endif

    face->root.family_name = Get_Name( face, TT_NAME_ID_FONT_FAMILY );
    face->root.style_name  = Get_Name( face, TT_NAME_ID_FONT_SUBFAMILY );

  Exit:
    return error;
  }


#undef LOAD_


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Done_Face                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Finalizes a given face object.                                     */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face :: A pointer to the face object to destroy.                   */
  /*                                                                       */
  LOCAL_DEF
  void  TT_Done_Face( TT_Face  face )
  {
    TT_UShort  n;
    FT_Memory  memory = face->root.memory;

    SFNT_Interface*  sfnt = face->sfnt;
    
    if (sfnt)
    {
      /* destroy the postscript names table if it is supported */
      if (sfnt->free_psnames)
        sfnt->free_psnames( face );
        
      /* destroy the embedded bitmaps table if it is supported */
      if (sfnt->free_sbits)
        sfnt->free_sbits( face );
    }

    /* freeing the kerning table */
    FREE( face->kern_pairs );
    face->num_kern_pairs = 0;

    /* freeing the collection table */
    FREE( face->ttc_header.TableDirectory );
    face->ttc_header.DirCount = 0;

    /* freeing table directory */
    FREE( face->dir_tables );
    face->num_tables = 0;

    /* freeing the locations table */
    FREE( face->glyph_locations );
    face->num_locations = 0;

    /* freeing the character mapping tables */
    if (sfnt && sfnt->load_charmaps )
    {
      for ( n = 0; n < face->num_charmaps; n++ )
        sfnt->free_charmap( face, &face->charmaps[n].cmap );
    }

    FREE( face->charmaps );
    face->num_charmaps = 0;

    FREE( face->root.charmaps );
    face->root.num_charmaps = 0;
    face->root.charmap      = 0;

    /* freeing the CVT */
    FREE( face->cvt );
    face->cvt_size = 0;

    /* freeing the horizontal metrics */
    FREE( face->horizontal.long_metrics );
    FREE( face->horizontal.short_metrics );

    /* freeing the vertical ones, if any */
    if ( face->vertical_info )
    {
      FREE( face->vertical.long_metrics  );
      FREE( face->vertical.short_metrics );
      face->vertical_info = 0;
    }

    /* freeing the programs */
    FREE( face->font_program );
    FREE( face->cvt_program );
    face->font_program_size = 0;
    face->cvt_program_size  = 0;

    /* freeing the gasp table */
    FREE( face->gasp.gaspRanges );
    face->gasp.numRanges = 0;

    /* freeing the name table */
    sfnt->free_names( face );

    /* freeing the hdmx table */
    sfnt->free_hdmx( face );

    /* freeing family and style name */
    FREE( face->root.family_name );
    FREE( face->root.style_name );
    
    face->sfnt = 0;
  }


  /*************************************************************************/
  /*                                                                       */
  /*                           SIZE  FUNCTIONS                             */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Init_Size                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Initializes a new TrueType size object.                            */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    size :: A handle to the size object.                               */
  /*                                                                       */
  /* <Return>                                                              */
  /*    TrueType error code.  0 means success.                             */
  /*                                                                       */
  LOCAL_DEF
  TT_Error  TT_Init_Size( TT_Size  size )
  {
    TT_Error   error = 0;
    
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
    TT_Face    face   = (TT_Face)size->root.face;
    FT_Memory  memory = face->root.memory;
    TT_Int     i;

    TT_ExecContext  exec;
    TT_UShort       n_twilight;
    TT_MaxProfile*  maxp = &face->max_profile;

    size->ttmetrics.valid = FALSE;

    size->max_function_defs    = maxp->maxFunctionDefs;
    size->max_instruction_defs = maxp->maxInstructionDefs;

    size->num_function_defs    = 0;
    size->num_instruction_defs = 0;

    size->max_func = 0;
    size->max_ins  = 0;

    size->cvt_size     = face->cvt_size;
    size->storage_size = maxp->maxStorage;

    /* Set default metrics */
    {
      FT_Size_Metrics*  metrics  = &size->root.metrics;
      TT_Size_Metrics*  metrics2 = &size->ttmetrics;

      metrics->x_ppem = 0;
      metrics->y_ppem = 0;

      metrics2->rotated   = FALSE;
      metrics2->stretched = FALSE;

      /* set default compensation (all 0) */
      for ( i = 0; i < 4; i++ )
        metrics2->compensations[i] = 0;
    }