cffobjs.c

下载来的一个看图软件的源代码

/***************************************************************************/
/*                                                                         */
/*  cffobjs.c                                                              */
/*                                                                         */
/*    OpenType objects manager (body).                                     */
/*                                                                         */
/*  Copyright 1996-2001, 2002, 2003 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_ERRORS_H
#include FT_TRUETYPE_IDS_H
#include FT_TRUETYPE_TAGS_H
#include FT_INTERNAL_SFNT_H
#include FT_INTERNAL_POSTSCRIPT_NAMES_H
#include FT_INTERNAL_POSTSCRIPT_HINTS_H
#include "cffobjs.h"
#include "cffload.h"
#include "cffcmap.h"
#include "cfferrs.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_cffobjs


  /*************************************************************************/
  /*                                                                       */
  /*                            SIZE FUNCTIONS                             */
  /*                                                                       */
  /*  Note that we store the global hints in the size's "internal" root    */
  /*  field.                                                               */
  /*                                                                       */
  /*************************************************************************/


  static PSH_Globals_Funcs
  cff_size_get_globals_funcs( CFF_Size  size )
  {
    CFF_Face          face     = (CFF_Face)size->face;
    CFF_Font          font     = (CFF_FontRec *)face->extra.data;
    PSHinter_Service  pshinter = (PSHinter_Service)font->pshinter;
    FT_Module         module;


    module = FT_Get_Module( size->face->driver->root.library,
                            "pshinter" );
    return ( module && pshinter && pshinter->get_globals_funcs )
           ? pshinter->get_globals_funcs( module )
           : 0;
  }


  FT_LOCAL_DEF( void )
  cff_size_done( CFF_Size  size )
  {
    if ( size->internal )
    {
      PSH_Globals_Funcs  funcs;


      funcs = cff_size_get_globals_funcs( size );
      if ( funcs )
        funcs->destroy( (PSH_Globals)size->internal );

      size->internal = 0;
    }
  }


  FT_LOCAL_DEF( FT_Error )
  cff_size_init( CFF_Size  size )
  {
    FT_Error           error = 0;
    PSH_Globals_Funcs  funcs = cff_size_get_globals_funcs( size );


    if ( funcs )
    {
      PSH_Globals    globals;
      CFF_Face       face    = (CFF_Face)size->face;
      CFF_Font       font    = (CFF_FontRec *)face->extra.data;
      CFF_SubFont    subfont = &font->top_font;

      CFF_Private    cpriv   = &subfont->private_dict;
      PS_PrivateRec  priv;


      /* IMPORTANT: The CFF and Type1 private dictionaries have    */
      /*            slightly different structures; we need to      */
      /*            synthetize a type1 dictionary on the fly here. */

      {
        FT_UInt  n, count;


        FT_MEM_ZERO( &priv, sizeof ( priv ) );

        count = priv.num_blue_values = cpriv->num_blue_values;
        for ( n = 0; n < count; n++ )
          priv.blue_values[n] = (FT_Short)cpriv->blue_values[n];

        count = priv.num_other_blues = cpriv->num_other_blues;
        for ( n = 0; n < count; n++ )
          priv.other_blues[n] = (FT_Short)cpriv->other_blues[n];

        count = priv.num_family_blues = cpriv->num_family_blues;
        for ( n = 0; n < count; n++ )
          priv.family_blues[n] = (FT_Short)cpriv->family_blues[n];

        count = priv.num_family_other_blues = cpriv->num_family_other_blues;
        for ( n = 0; n < count; n++ )
          priv.family_other_blues[n] = (FT_Short)cpriv->family_other_blues[n];

        priv.blue_scale = cpriv->blue_scale;
        priv.blue_shift = (FT_Int)cpriv->blue_shift;
        priv.blue_fuzz  = (FT_Int)cpriv->blue_fuzz;

        priv.standard_width[0]  = (FT_UShort)cpriv->standard_width;
        priv.standard_height[0] = (FT_UShort)cpriv->standard_height;

        count = priv.num_snap_widths = cpriv->num_snap_widths;
        for ( n = 0; n < count; n++ )
          priv.snap_widths[n] = (FT_Short)cpriv->snap_widths[n];

        count = priv.num_snap_heights = cpriv->num_snap_heights;
        for ( n = 0; n < count; n++ )
          priv.snap_heights[n] = (FT_Short)cpriv->snap_heights[n];

        priv.force_bold     = cpriv->force_bold;
        priv.language_group = cpriv->language_group;
        priv.lenIV          = cpriv->lenIV;
      }

      error = funcs->create( size->face->memory, &priv, &globals );
      if ( !error )
        size->internal = (FT_Size_Internal)(void*)globals;
    }

    return error;
  }


  FT_LOCAL_DEF( FT_Error )
  cff_size_reset( CFF_Size  size )
  {
    PSH_Globals_Funcs  funcs = cff_size_get_globals_funcs( size );
    FT_Error           error = 0;


    if ( funcs )
      error = funcs->set_scale( (PSH_Globals)size->internal,
                                 size->metrics.x_scale,
                                 size->metrics.y_scale,
                                 0, 0 );
    return error;
  }


  /*************************************************************************/
  /*                                                                       */
  /*                            SLOT  FUNCTIONS                            */
  /*                                                                       */
  /*************************************************************************/

  FT_LOCAL_DEF( void )
  cff_slot_done( CFF_GlyphSlot  slot )
  {
    slot->root.internal->glyph_hints = 0;
  }


  FT_LOCAL_DEF( FT_Error )
  cff_slot_init( CFF_GlyphSlot  slot )
  {
    CFF_Face          face     = (CFF_Face)slot->root.face;
    CFF_Font          font     = (CFF_FontRec *)face->extra.data;
    PSHinter_Service  pshinter = (PSHinter_Service)font->pshinter;


    if ( pshinter )
    {
      FT_Module  module;


      module = FT_Get_Module( slot->root.face->driver->root.library,
                              "pshinter" );
      if ( module )
      {
        T2_Hints_Funcs  funcs;


        funcs = pshinter->get_t2_funcs( module );
        slot->root.internal->glyph_hints = (void*)funcs;
      }
    }

    return 0;
  }


  /*************************************************************************/
  /*                                                                       */
  /*                           FACE  FUNCTIONS                             */
  /*                                                                       */
  /*************************************************************************/

  static FT_String*
  cff_strcpy( FT_Memory         memory,
              const FT_String*  source )
  {
    FT_Error    error;
    FT_String*  result = 0;
    FT_Int      len = (FT_Int)ft_strlen( source );


    if ( !FT_ALLOC( result, len + 1 ) )
    {
      FT_MEM_COPY( result, source, len );
      result[len] = 0;
    }

    FT_UNUSED( error );

    return result;
  }




  FT_LOCAL_DEF( FT_Error )
  cff_face_init( FT_Stream      stream,
                 CFF_Face       face,
                 FT_Int         face_index,
                 FT_Int         num_params,
                 FT_Parameter*  params )
  {
    FT_Error          error;
    SFNT_Service      sfnt;
    PSNames_Service   psnames;
    PSHinter_Service  pshinter;
    FT_Bool           pure_cff    = 1;
    FT_Bool           sfnt_format = 0;


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

    psnames = (PSNames_Service)FT_Get_Module_Interface(
                face->root.driver->root.library, "psnames" );

    pshinter = (PSHinter_Service)FT_Get_Module_Interface(
                 face->root.driver->root.library, "pshinter" );

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

    /* check that we have a valid OpenType file */
    error = sfnt->init_face( stream, face, face_index, num_params, params );
    if ( !error )
    {
      if ( face->format_tag != 0x4F54544FL )  /* `OTTO'; OpenType/CFF font */
      {
        FT_TRACE2(( "[not a valid OpenType/CFF font]\n" ));
        goto Bad_Format;
      }

      /* if we are performing a simple font format check, exit immediately */