kc3-lang/freetype/src/type42/t42objs.c

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  Date : 2023-01-17T09:18:25
  

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• src/type42/t42objs.c

• /****************************************************************************
   *
   * t42objs.c
   *
   *   Type 42 objects manager (body).
   *
   * Copyright (C) 2002-2023 by
   * Roberto Alameda.
   *
   * 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 "t42objs.h"
  #include "t42parse.h"
  #include "t42error.h"
  #include <freetype/internal/ftdebug.h>
  #include <freetype/ftlist.h>
  #include <freetype/ttnameid.h>
  
  
  #undef  FT_COMPONENT
  #define FT_COMPONENT  t42
  
  
    static FT_Error
    T42_Open_Face( T42_Face  face )
    {
      T42_LoaderRec  loader;
      T42_Parser     parser;
      T1_Font        type1 = &face->type1;
      FT_Memory      memory = face->root.memory;
      FT_Error       error;
  
      PSAux_Service  psaux  = (PSAux_Service)face->psaux;
  
  
      t42_loader_init( &loader, face );
  
      parser = &loader.parser;
  
      face->ttf_data = NULL;
      face->ttf_size = 0;
  
      error = t42_parser_init( parser,
                               face->root.stream,
                               memory,
                               psaux);
      if ( error )
        goto Exit;
  
      error = t42_parse_dict( face, &loader,
                              parser->base_dict, parser->base_len );
      if ( error )
        goto Exit;
  
      if ( type1->font_type != 42 )
      {
        FT_ERROR(( "T42_Open_Face: cannot handle FontType %d\n",
                   type1->font_type ));
        error = FT_THROW( Unknown_File_Format );
        goto Exit;
      }
  
      /* now, propagate the charstrings and glyphnames tables */
      /* to the Type1 data                                    */
      type1->num_glyphs = loader.num_glyphs;
  
      if ( !loader.charstrings.init )
      {
        FT_ERROR(( "T42_Open_Face: no charstrings array in face\n" ));
        error = FT_THROW( Invalid_File_Format );
      }
  
      loader.charstrings.init  = 0;
      type1->charstrings_block = loader.charstrings.block;
      type1->charstrings       = loader.charstrings.elements;
      type1->charstrings_len   = loader.charstrings.lengths;
  
      /* we copy the glyph names `block' and `elements' fields; */
      /* the `lengths' field must be released later             */
      type1->glyph_names_block    = loader.glyph_names.block;
      type1->glyph_names          = (FT_String**)loader.glyph_names.elements;
      loader.glyph_names.block    = NULL;
      loader.glyph_names.elements = NULL;
  
      /* we must now build type1.encoding when we have a custom array */
      if ( type1->encoding_type == T1_ENCODING_TYPE_ARRAY )
      {
        FT_Int  charcode, idx, min_char, max_char;
  
  
        /* OK, we do the following: for each element in the encoding   */
        /* table, look up the index of the glyph having the same name  */
        /* as defined in the CharStrings array.                        */
        /* The index is then stored in type1.encoding.char_index, and  */
        /* the name in type1.encoding.char_name                        */
  
        min_char = 0;
        max_char = 0;
  
        charcode = 0;
        for ( ; charcode < loader.encoding_table.max_elems; charcode++ )
        {
          const FT_String*  char_name =
                (const FT_String*)loader.encoding_table.elements[charcode];
  
  
          type1->encoding.char_index[charcode] = 0;
          type1->encoding.char_name [charcode] = ".notdef";
  
          if ( char_name )
            for ( idx = 0; idx < type1->num_glyphs; idx++ )
            {
              const FT_String*  glyph_name = type1->glyph_names[idx];
  
  
              if ( ft_strcmp( char_name, glyph_name ) == 0 )
              {
                type1->encoding.char_index[charcode] = (FT_UShort)idx;
                type1->encoding.char_name [charcode] = glyph_name;
  
                /* Change min/max encoded char only if glyph name is */
                /* not /.notdef                                      */
                if ( ft_strcmp( ".notdef", glyph_name ) != 0 )
                {
                  if ( charcode < min_char )
                    min_char = charcode;
                  if ( charcode >= max_char )
                    max_char = charcode + 1;
                }
                break;
              }
            }
        }
  
        type1->encoding.code_first = min_char;
        type1->encoding.code_last  = max_char;
        type1->encoding.num_chars  = loader.num_chars;
      }
  
    Exit:
      t42_loader_done( &loader );
      if ( error )
      {
        FT_FREE( face->ttf_data );
        face->ttf_size = 0;
      }
      return error;
    }
  
  
    /***************** Driver Functions *************/
  
  
    FT_LOCAL_DEF( FT_Error )
    T42_Face_Init( FT_Stream      stream,
                   FT_Face        t42face,       /* T42_Face */
                   FT_Int         face_index,
                   FT_Int         num_params,
                   FT_Parameter*  params )
    {
      T42_Face            face  = (T42_Face)t42face;
      FT_Error            error;
      FT_Service_PsCMaps  psnames;
      PSAux_Service       psaux;
      FT_Face             root  = (FT_Face)&face->root;
      T1_Font             type1 = &face->type1;
      PS_FontInfo         info  = &type1->font_info;
  
      FT_UNUSED( num_params );
      FT_UNUSED( params );
      FT_UNUSED( stream );
  
  
      face->ttf_face       = NULL;
      face->root.num_faces = 1;
  
      FT_FACE_FIND_GLOBAL_SERVICE( face, psnames, POSTSCRIPT_CMAPS );
      face->psnames = psnames;
  
      face->psaux = FT_Get_Module_Interface( FT_FACE_LIBRARY( face ),
                                             "psaux" );
      psaux = (PSAux_Service)face->psaux;
      if ( !psaux )
      {
        FT_ERROR(( "T42_Face_Init: cannot access `psaux' module\n" ));
        error = FT_THROW( Missing_Module );
        goto Exit;
      }
  
      FT_TRACE2(( "Type 42 driver\n" ));
  
      /* open the tokenizer, this will also check the font format */
      error = T42_Open_Face( face );
      if ( error )
        goto Exit;
  
      /* if we just wanted to check the format, leave successfully now */
      if ( face_index < 0 )
        goto Exit;
  
      /* check the face index */
      if ( ( face_index & 0xFFFF ) > 0 )
      {
        FT_ERROR(( "T42_Face_Init: invalid face index\n" ));
        error = FT_THROW( Invalid_Argument );
        goto Exit;
      }
  
      /* Now load the font program into the face object */
  
      /* Init the face object fields */
      /* Now set up root face fields */
  
      root->num_glyphs   = type1->num_glyphs;
      root->num_charmaps = 0;
      root->face_index   = 0;
  
      root->face_flags |= FT_FACE_FLAG_SCALABLE    |
                          FT_FACE_FLAG_HORIZONTAL  |
                          FT_FACE_FLAG_GLYPH_NAMES;
  
      if ( info->is_fixed_pitch )
        root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;
  
  #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
      root->face_flags |= FT_FACE_FLAG_HINTER;
  #endif
  
      /* XXX: TODO -- add kerning with .afm support */
  
      /* get style name -- be careful, some broken fonts only */
      /* have a `/FontName' dictionary entry!                 */
      root->family_name = info->family_name;
      /* assume "Regular" style if we don't know better */
      root->style_name = (char *)"Regular";
      if ( root->family_name )
      {
        char*  full   = info->full_name;
        char*  family = root->family_name;
  
  
        if ( full )
        {
          while ( *full )
          {
            if ( *full == *family )
            {
              family++;
              full++;
            }
            else
            {
              if ( *full == ' ' || *full == '-' )
                full++;
              else if ( *family == ' ' || *family == '-' )
                family++;
              else
              {
                if ( !*family )
                  root->style_name = full;
                break;
              }
            }
          }
        }
      }
      else
      {
        /* do we have a `/FontName'? */
        if ( type1->font_name )
          root->family_name = type1->font_name;
      }
  
      /* no embedded bitmap support */
      root->num_fixed_sizes = 0;
      root->available_sizes = NULL;
  
      /* Load the TTF font embedded in the T42 font */
      {
        FT_Open_Args  args;
  
  
        args.flags       = FT_OPEN_MEMORY | FT_OPEN_DRIVER;
        args.driver      = FT_Get_Module( FT_FACE_LIBRARY( face ),
                                          "truetype" );
        args.memory_base = face->ttf_data;
        args.memory_size = face->ttf_size;
  
        if ( num_params )
        {
          args.flags     |= FT_OPEN_PARAMS;
          args.num_params = num_params;
          args.params     = params;
        }
  
        error = FT_Open_Face( FT_FACE_LIBRARY( face ),
                              &args, 0, &face->ttf_face );
      }
  
      if ( error )
        goto Exit;
  
      FT_Done_Size( face->ttf_face->size );
  
      /* Ignore info in FontInfo dictionary and use the info from the  */
      /* loaded TTF font.  The PostScript interpreter also ignores it. */
      root->bbox         = face->ttf_face->bbox;
      root->units_per_EM = face->ttf_face->units_per_EM;
  
      root->ascender  = face->ttf_face->ascender;
      root->descender = face->ttf_face->descender;
      root->height    = face->ttf_face->height;
  
      root->max_advance_width  = face->ttf_face->max_advance_width;
      root->max_advance_height = face->ttf_face->max_advance_height;
  
      root->underline_position  = (FT_Short)info->underline_position;
      root->underline_thickness = (FT_Short)info->underline_thickness;
  
      /* compute style flags */
      root->style_flags = 0;
      if ( info->italic_angle )
        root->style_flags |= FT_STYLE_FLAG_ITALIC;
  
      if ( face->ttf_face->style_flags & FT_STYLE_FLAG_BOLD )
        root->style_flags |= FT_STYLE_FLAG_BOLD;
  
      if ( face->ttf_face->face_flags & FT_FACE_FLAG_VERTICAL )
        root->face_flags |= FT_FACE_FLAG_VERTICAL;
  
      {
        if ( psnames )
        {
          FT_CharMapRec    charmap;
          T1_CMap_Classes  cmap_classes = psaux->t1_cmap_classes;
          FT_CMap_Class    clazz;
  
  
          charmap.face = root;
  
          /* first of all, try to synthesize a Unicode charmap */
          charmap.platform_id = TT_PLATFORM_MICROSOFT;
          charmap.encoding_id = TT_MS_ID_UNICODE_CS;
          charmap.encoding    = FT_ENCODING_UNICODE;
  
          error = FT_CMap_New( cmap_classes->unicode, NULL, &charmap, NULL );
          if ( error                                      &&
               FT_ERR_NEQ( error, No_Unicode_Glyph_Name ) &&
               FT_ERR_NEQ( error, Unimplemented_Feature ) )
            goto Exit;
          error = FT_Err_Ok;
  
          /* now, generate an Adobe Standard encoding when appropriate */
          charmap.platform_id = TT_PLATFORM_ADOBE;
          clazz               = NULL;
  
          switch ( type1->encoding_type )
          {
          case T1_ENCODING_TYPE_STANDARD:
            charmap.encoding    = FT_ENCODING_ADOBE_STANDARD;
            charmap.encoding_id = TT_ADOBE_ID_STANDARD;
            clazz               = cmap_classes->standard;
            break;
  
          case T1_ENCODING_TYPE_EXPERT:
            charmap.encoding    = FT_ENCODING_ADOBE_EXPERT;
            charmap.encoding_id = TT_ADOBE_ID_EXPERT;
            clazz               = cmap_classes->expert;
            break;
  
          case T1_ENCODING_TYPE_ARRAY:
            charmap.encoding    = FT_ENCODING_ADOBE_CUSTOM;
            charmap.encoding_id = TT_ADOBE_ID_CUSTOM;
            clazz               = cmap_classes->custom;
            break;
  
          case T1_ENCODING_TYPE_ISOLATIN1:
            charmap.encoding    = FT_ENCODING_ADOBE_LATIN_1;
            charmap.encoding_id = TT_ADOBE_ID_LATIN_1;
            clazz               = cmap_classes->unicode;
            break;
  
          default:
            ;
          }
  
          if ( clazz )
            error = FT_CMap_New( clazz, NULL, &charmap, NULL );
        }
      }
    Exit:
      return error;
    }
  
  
    FT_LOCAL_DEF( void )
    T42_Face_Done( FT_Face  t42face )
    {
      T42_Face     face = (T42_Face)t42face;
      T1_Font      type1;
      PS_FontInfo  info;
      FT_Memory    memory;
  
  
      if ( !face )
        return;
  
      type1  = &face->type1;
      info   = &type1->font_info;
      memory = face->root.memory;
  
      /* delete internal ttf face prior to freeing face->ttf_data */
      if ( face->ttf_face )
        FT_Done_Face( face->ttf_face );
  
      /* release font info strings */
      FT_FREE( info->version );
      FT_FREE( info->notice );
      FT_FREE( info->full_name );
      FT_FREE( info->family_name );
      FT_FREE( info->weight );
  
      /* release top dictionary */
      FT_FREE( type1->charstrings_len );
      FT_FREE( type1->charstrings );
      FT_FREE( type1->glyph_names );
  
      FT_FREE( type1->charstrings_block );
      FT_FREE( type1->glyph_names_block );
  
      FT_FREE( type1->encoding.char_index );
      FT_FREE( type1->encoding.char_name );
      FT_FREE( type1->font_name );
  
      FT_FREE( face->ttf_data );
  
  #if 0
      /* release afm data if present */
      if ( face->afm_data )
        T1_Done_AFM( memory, (T1_AFM*)face->afm_data );
  #endif
  
      /* release unicode map, if any */
      FT_FREE( face->unicode_map.maps );
      face->unicode_map.num_maps = 0;
  
      face->root.family_name = NULL;
      face->root.style_name  = NULL;
    }
  
  
    /**************************************************************************
     *
     * @Function:
     *   T42_Driver_Init
     *
     * @Description:
     *   Initializes a given Type 42 driver object.
     *
     * @Input:
     *   driver ::
     *     A handle to the target driver object.
     *
     * @Return:
     *   FreeType error code.  0 means success.
     */
    FT_LOCAL_DEF( FT_Error )
    T42_Driver_Init( FT_Module  module )        /* T42_Driver */
    {
      T42_Driver  driver = (T42_Driver)module;
      FT_Module   ttmodule;
  
  
      ttmodule = FT_Get_Module( module->library, "truetype" );
      if ( !ttmodule )
      {
        FT_ERROR(( "T42_Driver_Init: cannot access `truetype' module\n" ));
        return FT_THROW( Missing_Module );
      }
  
      driver->ttclazz = (FT_Driver_Class)ttmodule->clazz;
  
      return FT_Err_Ok;
    }
  
  
    FT_LOCAL_DEF( void )
    T42_Driver_Done( FT_Module  module )
    {
      FT_UNUSED( module );
    }
  
  
    FT_LOCAL_DEF( FT_Error )
    T42_Size_Init( FT_Size  size )         /* T42_Size */
    {
      T42_Size  t42size = (T42_Size)size;
      FT_Face   face    = size->face;
      T42_Face  t42face = (T42_Face)face;
      FT_Size   ttsize;
      FT_Error  error;
  
  
      error = FT_New_Size( t42face->ttf_face, &ttsize );
      if ( !error )
        t42size->ttsize = ttsize;
  
      FT_Activate_Size( ttsize );
  
      return error;
    }
  
  
    FT_LOCAL_DEF( FT_Error )
    T42_Size_Request( FT_Size          t42size,      /* T42_Size */
                      FT_Size_Request  req )
    {
      T42_Size  size = (T42_Size)t42size;
      T42_Face  face = (T42_Face)t42size->face;
      FT_Error  error;
  
  
      FT_Activate_Size( size->ttsize );
  
      error = FT_Request_Size( face->ttf_face, req );
      if ( !error )
        t42size->metrics = face->ttf_face->size->metrics;
  
      return error;
    }
  
  
    FT_LOCAL_DEF( FT_Error )
    T42_Size_Select( FT_Size   t42size,         /* T42_Size */
                     FT_ULong  strike_index )
    {
      T42_Size  size = (T42_Size)t42size;
      T42_Face  face = (T42_Face)t42size->face;
      FT_Error  error;
  
  
      FT_Activate_Size( size->ttsize );
  
      error = FT_Select_Size( face->ttf_face, (FT_Int)strike_index );
      if ( !error )
        t42size->metrics = face->ttf_face->size->metrics;
  
      return error;
  
    }
  
  
    FT_LOCAL_DEF( void )
    T42_Size_Done( FT_Size  t42size )             /* T42_Size */
    {
      T42_Size     size    = (T42_Size)t42size;
      FT_Face      face    = t42size->face;
      T42_Face     t42face = (T42_Face)face;
      FT_ListNode  node;
  
  
      node = FT_List_Find( &t42face->ttf_face->sizes_list, size->ttsize );
      if ( node )
      {
        FT_Done_Size( size->ttsize );
        size->ttsize = NULL;
      }
    }
  
  
    FT_LOCAL_DEF( FT_Error )
    T42_GlyphSlot_Init( FT_GlyphSlot  t42slot )        /* T42_GlyphSlot */
    {
      T42_GlyphSlot  slot    = (T42_GlyphSlot)t42slot;
      FT_Face        face    = t42slot->face;
      T42_Face       t42face = (T42_Face)face;
      FT_GlyphSlot   ttslot;
      FT_Memory      memory  = face->memory;
      FT_Error       error   = FT_Err_Ok;
  
  
      if ( !face->glyph )
      {
        /* First glyph slot for this face */
        slot->ttslot = t42face->ttf_face->glyph;
      }
      else
      {
        error = FT_New_GlyphSlot( t42face->ttf_face, &ttslot );
        if ( !error )
          slot->ttslot = ttslot;
      }
  
      /* share the loader so that the autohinter can see it */
      FT_GlyphLoader_Done( slot->ttslot->internal->loader );
      FT_FREE( slot->ttslot->internal );
      slot->ttslot->internal = t42slot->internal;
  
      return error;
    }
  
  
    FT_LOCAL_DEF( void )
    T42_GlyphSlot_Done( FT_GlyphSlot  t42slot )       /* T42_GlyphSlot */
    {
      T42_GlyphSlot  slot = (T42_GlyphSlot)t42slot;
  
  
      /* do not destroy the inherited internal structure just yet */
      slot->ttslot->internal = NULL;
      FT_Done_GlyphSlot( slot->ttslot );
    }
  
  
    static void
    t42_glyphslot_clear( FT_GlyphSlot  slot )
    {
      /* free bitmap if needed */
      ft_glyphslot_free_bitmap( slot );
  
      /* clear all public fields in the glyph slot */
      FT_ZERO( &slot->metrics );
      FT_ZERO( &slot->outline );
      FT_ZERO( &slot->bitmap );
  
      slot->bitmap_left   = 0;
      slot->bitmap_top    = 0;
      slot->num_subglyphs = 0;
      slot->subglyphs     = NULL;
      slot->control_data  = NULL;
      slot->control_len   = 0;
      slot->other         = NULL;
      slot->format        = FT_GLYPH_FORMAT_NONE;
  
      slot->linearHoriAdvance = 0;
      slot->linearVertAdvance = 0;
    }
  
  
    FT_LOCAL_DEF( FT_Error )
    T42_GlyphSlot_Load( FT_GlyphSlot  glyph,
                        FT_Size       size,
                        FT_UInt       glyph_index,
                        FT_Int32      load_flags )
    {
      FT_Error         error;
      T42_GlyphSlot    t42slot = (T42_GlyphSlot)glyph;
      T42_Size         t42size = (T42_Size)size;
      T42_Face         t42face = (T42_Face)size->face;
      FT_Driver_Class  ttclazz = ((T42_Driver)glyph->face->driver)->ttclazz;
  
  
      FT_TRACE1(( "T42_GlyphSlot_Load: glyph index %d\n", glyph_index ));
  
      /* map T42 glyph index to embedded TTF's glyph index */
      glyph_index = (FT_UInt)ft_strtol(
                      (const char *)t42face->type1.charstrings[glyph_index],
                      NULL, 10 );
  
      t42_glyphslot_clear( t42slot->ttslot );
      error = ttclazz->load_glyph( t42slot->ttslot,
                                   t42size->ttsize,
                                   glyph_index,
                                   load_flags | FT_LOAD_NO_BITMAP );
  
      if ( !error )
      {
        glyph->metrics = t42slot->ttslot->metrics;
  
        glyph->linearHoriAdvance = t42slot->ttslot->linearHoriAdvance;
        glyph->linearVertAdvance = t42slot->ttslot->linearVertAdvance;
  
        glyph->format  = t42slot->ttslot->format;
        glyph->outline = t42slot->ttslot->outline;
  
        glyph->bitmap      = t42slot->ttslot->bitmap;
        glyph->bitmap_left = t42slot->ttslot->bitmap_left;
        glyph->bitmap_top  = t42slot->ttslot->bitmap_top;
  
        glyph->num_subglyphs = t42slot->ttslot->num_subglyphs;
        glyph->subglyphs     = t42slot->ttslot->subglyphs;
  
        glyph->control_data  = t42slot->ttslot->control_data;
        glyph->control_len   = t42slot->ttslot->control_len;
      }
  
      return error;
    }
  
  
  /* END */
  

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