ttobjs.c

奇趣公司比较新的qt/emd版本

/***************************************************************************/
/*                                                                         */
/*  ttobjs.c                                                               */
/*                                                                         */
/*    Objects manager (body).                                              */
/*                                                                         */
/*  Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007 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 <ft2build.h>
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_CALC_H
#include FT_INTERNAL_STREAM_H
#include FT_TRUETYPE_IDS_H
#include FT_TRUETYPE_TAGS_H
#include FT_INTERNAL_SFNT_H

#include "ttgload.h"
#include "ttpload.h"

#include "tterrors.h"

#ifdef TT_USE_BYTECODE_INTERPRETER
#include "ttinterp.h"
#endif

#ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING
#include FT_TRUETYPE_UNPATENTED_H
#endif

#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
#include "ttgxvar.h"
#endif

  /*************************************************************************/
  /*                                                                       */
  /* 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_ttobjs


#ifdef TT_USE_BYTECODE_INTERPRETER

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


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    tt_glyphzone_done                                                  */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Deallocate a glyph zone.                                           */
  /*                                                                       */
  /* <Input>                                                               */
  /*    zone :: A pointer to the target glyph zone.                        */
  /*                                                                       */
  FT_LOCAL_DEF( void )
  tt_glyphzone_done( TT_GlyphZone  zone )
  {
    FT_Memory  memory = zone->memory;


    if ( memory )
    {
      FT_FREE( zone->contours );
      FT_FREE( zone->tags );
      FT_FREE( zone->cur );
      FT_FREE( zone->org );
      FT_FREE( zone->orus );

      zone->max_points   = zone->n_points   = 0;
      zone->max_contours = zone->n_contours = 0;
      zone->memory       = NULL;
    }
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    tt_glyphzone_new                                                   */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Allocate a new glyph zone.                                         */
  /*                                                                       */
  /* <Input>                                                               */
  /*    memory      :: A handle to the current memory object.              */
  /*                                                                       */
  /*    maxPoints   :: The capacity of glyph zone in points.               */
  /*                                                                       */
  /*    maxContours :: The capacity of glyph zone in contours.             */
  /*                                                                       */
  /* <Output>                                                              */
  /*    zone        :: A pointer to the target glyph zone record.          */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_LOCAL_DEF( FT_Error )
  tt_glyphzone_new( FT_Memory     memory,
                    FT_UShort     maxPoints,
                    FT_Short      maxContours,
                    TT_GlyphZone  zone )
  {
    FT_Error  error;


    FT_MEM_ZERO( zone, sizeof ( *zone ) );
    zone->memory = memory;

    if ( FT_NEW_ARRAY( zone->org,      maxPoints   ) ||
         FT_NEW_ARRAY( zone->cur,      maxPoints   ) ||
         FT_NEW_ARRAY( zone->orus,     maxPoints   ) ||
         FT_NEW_ARRAY( zone->tags,     maxPoints   ) ||
         FT_NEW_ARRAY( zone->contours, maxContours ) )
    {
      tt_glyphzone_done( zone );
    }
    else
    {
      zone->max_points   = maxPoints;
      zone->max_contours = maxContours;
    }

    return error;
  }
#endif /* TT_USE_BYTECODE_INTERPRETER */


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    tt_face_init                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Initialize a given TrueType face object.                           */
  /*                                                                       */
  /* <Input>                                                               */
  /*    stream     :: The source font stream.                              */
  /*                                                                       */
  /*    face_index :: The index of the font face in the resource.          */
  /*                                                                       */
  /*    num_params :: Number of additional generic parameters.  Ignored.   */
  /*                                                                       */
  /*    params     :: Additional generic parameters.  Ignored.             */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    face       :: The newly built face object.                         */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_LOCAL_DEF( FT_Error )
  tt_face_init( FT_Stream      stream,
                FT_Face        ttface,      /* TT_Face */
                FT_Int         face_index,
                FT_Int         num_params,
                FT_Parameter*  params )
  {
    FT_Error      error;
    FT_Library    library;
    SFNT_Service  sfnt;
    TT_Face       face = (TT_Face)ttface;


    library = face->root.driver->root.library;
    sfnt    = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" );
    if ( !sfnt )
      goto Bad_Format;

    /* create input stream from resource */
    if ( FT_STREAM_SEEK( 0 ) )
      goto Exit;

    /* check that we have a valid TrueType file */
    error = sfnt->init_face( stream, face, face_index, num_params, params );
    if ( error )
      goto Exit;

    /* We must also be able to accept Mac/GX fonts, as well as OT ones. */
    /* The 0x00020000 tag is completely undocumented; some fonts from   */
    /* Arphic made for Chinese Windows 3.1 have this.                   */
    if ( face->format_tag != 0x00010000L &&    /* MS fonts  */
         face->format_tag != 0x00020000L &&    /* CJK fonts for Win 3.1 */
         face->format_tag != TTAG_true   )     /* Mac fonts */
    {
      FT_TRACE2(( "[not a valid TTF font]\n" ));
      goto Bad_Format;
    }

#ifdef TT_USE_BYTECODE_INTERPRETER
    face->root.face_flags |= FT_FACE_FLAG_HINTER;
#endif

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

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

    error = tt_face_load_hdmx( face, stream );
    if ( error )
      goto Exit;

    if ( face->root.face_flags & FT_FACE_FLAG_SCALABLE )
    {

#ifdef FT_CONFIG_OPTION_INCREMENTAL

      if ( !face->root.internal->incremental_interface )
        error = tt_face_load_loca( face, stream );
      if ( !error )
        error = tt_face_load_cvt( face, stream )  ||
                tt_face_load_fpgm( face, stream ) ||
                tt_face_load_prep( face, stream );

#else

      if ( !error )
        error = tt_face_load_loca( face, stream ) ||
                tt_face_load_cvt( face, stream )  ||
                tt_face_load_fpgm( face, stream ) ||
                tt_face_load_prep( face, stream );

#endif

    }

#if defined( TT_CONFIG_OPTION_UNPATENTED_HINTING    ) && \
    !defined( TT_CONFIG_OPTION_BYTECODE_INTERPRETER )

    {
      FT_Bool  unpatented_hinting;
      int      i;


      /* Determine whether unpatented hinting is to be used for this face. */
      unpatented_hinting = FT_BOOL
        ( library->debug_hooks[FT_DEBUG_HOOK_UNPATENTED_HINTING] != NULL );

      for ( i = 0; i < num_params && !face->unpatented_hinting; i++ )
        if ( params[i].tag == FT_PARAM_TAG_UNPATENTED_HINTING )
          unpatented_hinting = TRUE;

      /* Compare the face with a list of well-known `tricky' fonts. */
      /* This list shall be expanded as we find more of them.       */
      if ( !unpatented_hinting )
      {
        static const char* const  trick_names[] =
        {
          "DFKaiSho-SB",     /* dfkaisb.ttf */
          "DFKai-SB",        /* kaiu.ttf */
          "HuaTianSongTi?",  /* htst3.ttf */
          "MingLiU",         /* mingliu.ttf & mingliu.ttc */
          "PMingLiU",        /* mingliu.ttc */
          "MingLi43",        /* mingli.ttf */
          NULL
        };
        int  nn;


        /* Note that we only check the face name at the moment; it might */
        /* be worth to do more checks for a few special cases.           */
        for ( nn = 0; trick_names[nn] != NULL; nn++ )
        {
          if ( ttface->family_name                               &&
               ft_strstr( ttface->family_name, trick_names[nn] ) )
          {
            unpatented_hinting = 1;
            break;
          }
        }
      }

      ttface->internal->ignore_unpatented_hinter =
        FT_BOOL( !unpatented_hinting );
    }

#endif /* TT_CONFIG_OPTION_UNPATENTED_HINTING &&
          !TT_CONFIG_OPTION_BYTECODE_INTERPRETER */

    /* initialize standard glyph loading routines */
    TT_Init_Glyph_Loading( face );

  Exit:
    return error;

  Bad_Format:
    error = TT_Err_Unknown_File_Format;
    goto Exit;
  }


  /*************************************************************************/
  /*                                                                       */