ttpost.c

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Hash : f0df85ba
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Date : 2000-06-22T00:17:42

- MAJOR INTERNAL REDESIGN: A lot of internal modifications have been performed lately on the source in order to provide the following enhancements: - more generic module support: The FT_Module type is now defined to represent a handle to a given module. The file <freetype/ftmodule.h> contains the FT_Module_Class definition, as well as the module-loading public API The FT_Driver type is still defined, and still represents a pointer to a font driver. Note that FT_Add_Driver is replaced by FT_Add_Module, FT_Get_Driver by FT_Get_Module, etc.. - support for generic glyph image types: The FT_Renderer type is a pointer to a module used to perform various operations on glyph image. Each renderer is capable of handling images in a single format (e.g. ft_glyph_format_outline). Its functions are used to: - transform an glyph image - render a glyph image into a bitmap - return the control box (dimensions) of a given glyph image The scan converters "ftraster.c" and "ftgrays.c" have been moved to the new directory "src/renderer", and are used to provide two default renderer modules. One corresponds to the "standard" scan-converter, the other to the "smooth" one. The current renderer can be set through the new function FT_Set_Renderer. The old raster-related function FT_Set_Raster, FT_Get_Raster and FT_Set_Raster_Mode have now disappeared, in favor of the new: FT_Get_Renderer FT_Set_Renderer see the file <freetype/ftrender.h> for more details.. These changes were necessary to properly support different scalable formats in the future, like bi-color glyphs, etc.. - glyph loader object: A new internal object, called a 'glyph loader' has been introduced in the base layer. It is used by all scalable format font drivers to load glyphs and composites. This object has been created to reduce the code size of each driver, as each one of them basically re-implemented its functionality. See <freetype/internal/ftobjs.h> and the FT_GlyphLoader type for more information.. - FT_GlyphSlot had new fields: In order to support extended features (see below), the FT_GlyphSlot structure has a few new fields: linearHoriAdvance: this field gives the linearly scaled (i.e. scaled but unhinted) advance width for the glyph, expressed as a 16.16 fixed pixel value. This is useful to perform WYSIWYG text. linearVertAdvance: this field gives the linearly scaled advance height for the glyph (relevant in vertical glyph layouts only). This is useful to perform WYSIWYG text. Note that the two above field replace the removed "metrics2" field in the glyph slot. advance: this field is a vector that gives the transformed advance for the glyph. By default, it corresponds to the advance width, unless FT_LOAD_VERTICAL_LAYOUT was specified when calling FT_Load_Glyph or FT_Load_Char bitmap_left: this field gives the distance in integer pixels from the current pen position to the left-most pixel of a glyph image WHEN IT IS A BITMAP. It is only valid when the "format" field is set to "ft_glyph_format_bitmap", for example, after calling the new function FT_Render_Glyph. bitmap_top: this field gives the distance in integer pixels from the current pen position (located on the baseline) to the top-most pixel of the glyph image WHEN IT IS A BITMAP. Positive values correspond to upwards Y. loader: this is a new private field for the glyph slot. Client applications should not touch it.. - support for transforms and direct rendering in FT_Load_Glyph: Most of the functionality found in <freetype/ftglyph.h> has been moved to the core library. Hence, the following: - a transform can be specified for a face through FT_Set_Transform. this transform is applied by FT_Load_Glyph to scalable glyph images (i.e. NOT TO BITMAPS) before the function returns, unless the bit flag FT_LOAD_IGNORE_TRANSFORM was set in the load flags.. - once a glyph image has been loaded, it can be directly converted to a bitmap by using the new FT_Render_Glyph function. Note that this function takes the glyph image from the glyph slot, and converts it to a bitmap whose properties are returned in "face.glyph.bitmap", "face.glyph.bitmap_left" and "face.glyph.bitmap_top". The original native image might be lost after the conversion. - when using the new bit flag FT_LOAD_RENDER, the FT_Load_Glyph and FT_Load_Char functions will call FT_Render_Glyph automatically when needed.

src/sfnt/ttpost.c

/***************************************************************************/
/*                                                                         */
/*  ttpost.c                                                               */
/*                                                                         */
/*    Postcript name table processing for TrueType and OpenType fonts      */
/*    (body).                                                              */
/*                                                                         */
/*  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.                                        */
/*                                                                         */
/***************************************************************************/

  /*************************************************************************/
  /*                                                                       */
  /* The post table is not completely loaded by the core engine.  This     */
  /* file loads the missing PS glyph names and implements an API to access */
  /* them.                                                                 */
  /*                                                                       */
  /*************************************************************************/


#include <freetype/internal/ftstream.h>
#include <freetype/internal/tterrors.h>
#include <freetype/tttags.h>

#include <ttpost.h>
#include <ttload.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_ttpost


  /* If this configuration macro is defined, we rely on the `psnames' */
  /* module to grab the glyph names.                                  */

#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES

#include <freetype/internal/psnames.h>

#define MAC_NAME( x )  ( (FT_String*)psnames->macintosh_name( x ) )

#else /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */

   /* Otherwise, we ignore the `psnames' module, and provide our own  */
   /* table of Mac names.  Thus, it is possible to build a version of */
   /* FreeType without the Type 1 driver & PSNames module.            */

#define  MAC_NAME( x )  TT_Post_Default_Names[x]

  /* the 258 default Mac PS glyph names */

  FT_String*  TT_Post_Default_Names[258] =
  {
    /*   0 */
    ".notdef", ".null", "CR", "space", "exclam",
    "quotedbl", "numbersign", "dollar", "percent", "ampersand",
    /*  10 */
    "quotesingle", "parenleft", "parenright", "asterisk", "plus",
    "comma", "hyphen", "period", "slash", "zero",
    /*  20 */
    "one", "two", "three", "four", "five",
    "six", "seven", "eight", "nine", "colon",
    /*  30 */
    "semicolon", "less", "equal", "greater", "question",
    "at", "A", "B", "C", "D",
    /*  40 */
    "E", "F", "G", "H", "I",
    "J", "K", "L", "M", "N",
    /*  50 */
    "O", "P", "Q", "R", "S",
    "T", "U", "V", "W", "X",
    /*  60 */
    "Y", "Z", "bracketleft", "backslash", "bracketright",
    "asciicircum", "underscore", "grave", "a", "b",
    /*  70 */
    "c", "d", "e", "f", "g",
    "h", "i", "j", "k", "l",
    /*  80 */
    "m", "n", "o", "p", "q",
    "r", "s", "t", "u", "v",
    /*  90 */
    "w", "x", "y", "z", "braceleft",
    "bar", "braceright", "asciitilde", "Adieresis", "Aring",
    /* 100 */
    "Ccedilla", "Eacute", "Ntilde", "Odieresis", "Udieresis",
    "aacute", "agrave", "acircumflex", "adieresis", "atilde",
    /* 110 */
    "aring", "ccedilla", "eacute", "egrave", "ecircumflex",
    "edieresis", "iacute", "igrave", "icircumflex", "idieresis",
    /* 120 */
    "ntilde", "oacute", "ograve", "ocircumflex", "odieresis",
    "otilde", "uacute", "ugrave", "ucircumflex", "udieresis",
    /* 130 */
    "dagger", "degree", "cent", "sterling", "section",
    "bullet", "paragraph", "germandbls", "registered", "copyright",
    /* 140 */
    "trademark", "acute", "dieresis", "notequal", "AE",
    "Oslash", "infinity", "plusminus", "lessequal", "greaterequal",
    /* 150 */
    "yen", "mu", "partialdiff", "summation", "product",
    "pi", "integral", "ordfeminine", "ordmasculine", "Omega",
    /* 160 */
    "ae", "oslash", "questiondown", "exclamdown", "logicalnot",
    "radical", "florin", "approxequal", "Delta", "guillemotleft",
    /* 170 */
    "guillemotright", "ellipsis", "nbspace", "Agrave", "Atilde",
    "Otilde", "OE", "oe", "endash", "emdash",
    /* 180 */
    "quotedblleft", "quotedblright", "quoteleft", "quoteright", "divide",
    "lozenge", "ydieresis", "Ydieresis", "fraction", "currency",
    /* 190 */
    "guilsinglleft", "guilsinglright", "fi", "fl", "daggerdbl",
    "periodcentered", "quotesinglbase", "quotedblbase", "perthousand", "Acircumflex",
    /* 200 */
    "Ecircumflex", "Aacute", "Edieresis", "Egrave", "Iacute",
    "Icircumflex", "Idieresis", "Igrave", "Oacute", "Ocircumflex",
    /* 210 */
    "apple", "Ograve", "Uacute", "Ucircumflex", "Ugrave",
    "dotlessi", "circumflex", "tilde", "macron", "breve",
    /* 220 */
    "dotaccent", "ring", "cedilla", "hungarumlaut", "ogonek",
    "caron", "Lslash", "lslash", "Scaron", "scaron",
    /* 230 */
    "Zcaron", "zcaron", "brokenbar", "Eth", "eth",
    "Yacute", "yacute", "Thorn", "thorn", "minus",
    /* 240 */
    "multiply", "onesuperior", "twosuperior", "threesuperior", "onehalf",
    "onequarter", "threequarters", "franc", "Gbreve", "gbreve",
    /* 250 */
    "Idot", "Scedilla", "scedilla", "Cacute", "cacute",
    "Ccaron", "ccaron", "dmacron",
  };

#endif /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */


  static
  FT_Error  Load_Format_20( TT_Face    face,
                            FT_Stream  stream )
  {
    FT_Memory  memory = stream->memory;
    FT_Error   error;

    FT_Int     num_glyphs;
    FT_Int     num_names;

    FT_UShort* glyph_indices = 0;
    FT_Char**  name_strings  = 0;


    if ( READ_UShort( num_glyphs ) )
      goto Exit;

    /* UNDOCUMENTED!  The number of glyphs in this table can be smaller */
    /* than the value in the maxp table (cf. cyberbit.ttf).             */

    /* There already exist fonts which have more than 32768 glyph names */
    /* in this table, so the test for this threshold has been dropped.  */

    if ( num_glyphs > face->root.num_glyphs )
    {
      error = TT_Err_Invalid_File_Format;
      goto Exit;
    }

    /* load the indices */
    {
      FT_Int  n;


      if ( ALLOC_ARRAY ( glyph_indices, num_glyphs, FT_UShort ) ||
           ACCESS_Frame( num_glyphs * 2L )                      )
        goto Fail;

      for ( n = 0; n < num_glyphs; n++ )
        glyph_indices[n] = GET_UShort();

      FORGET_Frame();
    }

    /* compute number of names stored in table */
    {
      FT_Int  n;


      num_names = 0;

      for ( n = 0; n < num_glyphs; n++ )
      {
        FT_Int  index;


        index = glyph_indices[n];
        if ( index >= 258 )
        {
          index -= 257;
          if ( index > num_names )
            num_names = index;
        }
      }
    }

    /* now load the name strings */
    {
      FT_Int  n;


      if ( ALLOC_ARRAY( name_strings, num_names, FT_Char* ) )
        goto Fail;

      for ( n = 0; n < num_names; n++ )
      {
        FT_UInt  len;


        if ( READ_Byte  ( len )                             ||
             ALLOC_ARRAY( name_strings[n], len+1, FT_Char ) ||
             FILE_Read  ( name_strings[n], len )            )
          goto Fail1;

        name_strings[n][len] = '\0';
      }
    }

    /* all right, set table fields and exit successfuly */
    {
      TT_Post_20*  table = &face->postscript_names.names.format_20;


      table->num_glyphs    = num_glyphs;
      table->num_names     = num_names;
      table->glyph_indices = glyph_indices;
      table->glyph_names   = name_strings;
    }
    return TT_Err_Ok;


  Fail1:
    {
      FT_Int  n;


      for ( n = 0; n < num_names; n++ )
        FREE( name_strings[n] );
    }

  Fail:
    FREE( name_strings );
    FREE( glyph_indices );

  Exit:
    return error;
  }


  static
  FT_Error  Load_Format_25( TT_Face    face,
                            FT_Stream  stream )
  {
    FT_Memory  memory = stream->memory;
    FT_Error   error;

    FT_Int     num_glyphs;
    FT_Char*   offset_table = 0;


    /* UNDOCUMENTED!  This value appears only in the Apple TT specs. */
    if ( READ_UShort( num_glyphs ) )
      goto Exit;

    /* check the number of glyphs */
    if ( num_glyphs > face->root.num_glyphs || num_glyphs > 258 )
    {
      error = TT_Err_Invalid_File_Format;
      goto Exit;
    }

    if ( ALLOC    ( offset_table, num_glyphs ) ||
         FILE_Read( offset_table, num_glyphs ) )
      goto Fail;

    /* now check the offset table */
    {
      FT_Int  n;


      for ( n = 0; n < num_glyphs; n++ )
      {
        FT_Long  index = (FT_Long)n + offset_table[n];


        if ( index < 0 || index > num_glyphs )
        {
          error = TT_Err_Invalid_File_Format;
          goto Fail;
        }
      }
    }

    /* OK, set table fields and exit successfuly */
    {
      TT_Post_25*  table = &face->postscript_names.names.format_25;


      table->num_glyphs = num_glyphs;
      table->offsets    = offset_table;
    }

    return TT_Err_Ok;

  Fail:
    FREE( offset_table );

  Exit:
    return error;
  }


  static
  FT_Error  Load_Post_Names( TT_Face  face )
  {
    FT_Stream   stream;
    FT_Error    error;

    /* get a stream for the face's resource */
    stream = face->root.stream;

    /* seek to the beginning of the PS names table */
    error = face->goto_table( face, TTAG_post, stream, 0 );
    if ( error )
      goto Exit;

    /* now read postscript table */
    switch ( face->postscript.FormatType )
    {
    case 0x00020000L:
      error = Load_Format_20( face, stream );
      break;

    case 0x00028000L:
      error = Load_Format_25( face, stream );
      break;

    default:
      error = TT_Err_Invalid_File_Format;
    }

    face->postscript_names.loaded = 1;

  Exit:
    return error;
  }


  LOCAL_FUNC
  void  TT_Free_Post_Names( TT_Face  face )
  {
    FT_Memory       memory = face->root.memory;
    TT_Post_Names*  names  = &face->postscript_names;


    if ( names->loaded )
    {
      switch ( face->postscript.FormatType )
      {
      case 0x00020000L:
        {
          TT_Post_20*  table = &names->names.format_20;
          FT_UInt      n;


          FREE( table->glyph_indices );
          table->num_glyphs = 0;

          for ( n = 0; n < table->num_names; n++ )
            FREE( table->glyph_names[n] );

          FREE( table->glyph_names );
          table->num_names = 0;
        }
        break;

      case 0x00028000L:
        {
          TT_Post_25*  table = &names->names.format_25;


          FREE( table->offsets );
          table->num_glyphs = 0;
        }
        break;
      }
    }
    names->loaded = 0;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Get_PS_Name                                                     */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Gets the PostScript glyph name of a glyph.                         */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face   :: A handle to the parent face.                             */
  /*                                                                       */
  /*    index  :: The glyph index.                                         */
  /*                                                                       */
  /*    PSname :: The address of a string pointer.  Will be NULL in case   */
  /*              of error, otherwise it is a pointer to the glyph name.   */
  /*                                                                       */
  /*              You must not modify the returned string!                 */
  /*                                                                       */
  /* <Output>                                                              */
  /*    TrueType error code.  0 means success.                             */
  /*                                                                       */
  LOCAL_FUNC
  FT_Error  TT_Get_PS_Name( TT_Face      face,
                            FT_UInt      index,
                            FT_String**  PSname )
  {
    FT_Error            error;
    TT_Post_Names*      names;

#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
    PSNames_Interface*  psnames;
#endif


    if ( !face )
      return TT_Err_Invalid_Face_Handle;

    if ( index >= (FT_UInt)face->root.num_glyphs )
      return TT_Err_Invalid_Glyph_Index;

#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
    psnames = (PSNames_Interface*)face->psnames;
    if ( !psnames )
      return TT_Err_Unimplemented_Feature;
#endif

    names = &face->postscript_names;

    /* `.notdef' by default */
    *PSname = MAC_NAME( 0 );

    switch ( face->postscript.FormatType )
    {
    case 0x00010000L:
      if ( index < 258 )                    /* paranoid checking */
        *PSname = MAC_NAME( index );
      break;

    case 0x00020000L:
      {
        TT_Post_20*  table = &names->names.format_20;


        if ( !names->loaded )
        {
          error = Load_Post_Names( face );
          if ( error )
            break;
        }

        if ( index < table->num_glyphs )
        {
          FT_UShort  name_index = table->glyph_indices[index];


          if ( name_index < 258 )
            *PSname = MAC_NAME( name_index );
          else
            *PSname = (FT_String*)table->glyph_names[name_index - 258];
        }
      }
      break;

    case 0x00028000L:
      {
        TT_Post_25*  table = &names->names.format_25;


        if ( !names->loaded )
        {
          error = Load_Post_Names( face );
          if ( error )
            break;
        }

        if ( index < table->num_glyphs )    /* paranoid checking */
        {
          index  += table->offsets[index];
          *PSname = MAC_NAME( index );
        }
      }
      break;

    case 0x00030000L:
      break;                                /* nothing to do */
    }

    return TT_Err_Ok;
  }


/* END */

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