kc3-lang/freetype/src/cff/cffdrivr.c

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• Hash : 6ce03efb
  Author :
  Date : 2001-03-20T14:50:04
  

  * include/freetype/config/ftheader.h, include/freetype/ftsnames.h: renamed "ftnames.h" to "ftsnames.h", and FT_NAMES_H to FT_SFNT_NAMES_H * docs/docmaker.py: added generation of INDEX link in table of contents

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• src/cff/cffdrivr.c

• /***************************************************************************/
  /*                                                                         */
  /*  cffdrivr.c                                                             */
  /*                                                                         */
  /*    OpenType font driver implementation (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.                                        */
  /*                                                                         */
  /***************************************************************************/
  
  
  #include <ft2build.h>
  #include FT_FREETYPE_H
  #include FT_INTERNAL_DEBUG_H
  #include FT_INTERNAL_STREAM_H
  #include FT_INTERNAL_SFNT_H
  #include FT_TRUETYPE_IDS_H
  #include FT_INTERNAL_CFF_ERRORS_H
  
  #include "cffdrivr.h"
  #include "cffgload.h"
  #include "cffload.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_cffdriver
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
    /****                                                                 ****/
    /****                                                                 ****/
    /****                          F A C E S                              ****/
    /****                                                                 ****/
    /****                                                                 ****/
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
  
  
  #undef  PAIR_TAG
  #define PAIR_TAG( left, right )  ( ( (FT_ULong)left << 16 ) | \
                                       (FT_ULong)right        )
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    Get_Kerning                                                        */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A driver method used to return the kerning vector between two      */
    /*    glyphs of the same face.                                           */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face        :: A handle to the source face object.                 */
    /*                                                                       */
    /*    left_glyph  :: The index of the left glyph in the kern pair.       */
    /*                                                                       */
    /*    right_glyph :: The index of the right glyph in the kern pair.      */
    /*                                                                       */
    /* <Output>                                                              */
    /*    kerning     :: The kerning vector.  This is in font units for      */
    /*                   scalable formats, and in pixels for fixed-sizes     */
    /*                   formats.                                            */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0 means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    Only horizontal layouts (left-to-right & right-to-left) are        */
    /*    supported by this function.  Other layouts, or more sophisticated  */
    /*    kernings, are out of scope of this method (the basic driver        */
    /*    interface is meant to be simple).                                  */
    /*                                                                       */
    /*    They can be implemented by format-specific interfaces.             */
    /*                                                                       */
    static
    FT_Error  Get_Kerning( TT_Face     face,
                           FT_UInt     left_glyph,
                           FT_UInt     right_glyph,
                           FT_Vector*  kerning )
    {
      TT_Kern_0_Pair*  pair;
  
  
      if ( !face )
        return CFF_Err_Invalid_Face_Handle;
  
      kerning->x = 0;
      kerning->y = 0;
  
      if ( face->kern_pairs )
      {
        /* there are some kerning pairs in this font file! */
        FT_ULong  search_tag = PAIR_TAG( left_glyph, right_glyph );
        FT_Long   left, right;
  
  
        left  = 0;
        right = face->num_kern_pairs - 1;
  
        while ( left <= right )
        {
          FT_Int    middle = left + ( ( right - left ) >> 1 );
          FT_ULong  cur_pair;
  
  
          pair     = face->kern_pairs + middle;
          cur_pair = PAIR_TAG( pair->left, pair->right );
  
          if ( cur_pair == search_tag )
            goto Found;
  
          if ( cur_pair < search_tag )
            left = middle + 1;
          else
            right = middle - 1;
        }
      }
  
    Exit:
      return CFF_Err_Ok;
  
    Found:
      kerning->x = pair->value;
      goto Exit;
    }
  
  
  #undef PAIR_TAG
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    Load_Glyph                                                         */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A driver method used to load a glyph within a given glyph slot.    */
    /*                                                                       */
    /* <Input>                                                               */
    /*    slot        :: A handle to the target slot object where the glyph  */
    /*                   will be loaded.                                     */
    /*                                                                       */
    /*    size        :: A handle to the source face size at which the glyph */
    /*                   must be scaled, loaded, etc.                        */
    /*                                                                       */
    /*    glyph_index :: The index of the glyph in the font file.            */
    /*                                                                       */
    /*    load_flags  :: A flag indicating what to load for this glyph.  The */
    /*                   FTLOAD_??? constants can be used to control the     */
    /*                   glyph loading process (e.g., whether the outline    */
    /*                   should be scaled, whether to load bitmaps or not,   */
    /*                   whether to hint the outline, etc).                  */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0 means success.                             */
    /*                                                                       */
    static
    FT_Error  Load_Glyph( CFF_GlyphSlot  slot,
                          CFF_Size       size,
                          FT_UShort      glyph_index,
                          FT_UInt        load_flags )
    {
      FT_Error  error;
  
  
      if ( !slot )
        return CFF_Err_Invalid_Glyph_Handle;
  
      /* check whether we want a scaled outline or bitmap */
      if ( !size )
        load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
  
      if ( load_flags & FT_LOAD_NO_SCALE )
        size = NULL;
  
      /* reset the size object if necessary */
      if ( size )
      {
        /* these two object must have the same parent */
        if ( size->face != slot->root.face )
          return CFF_Err_Invalid_Face_Handle;
      }
  
      /* now load the glyph outline if necessary */
      error = CFF_Load_Glyph( slot, size, glyph_index, load_flags );
  
      /* force drop-out mode to 2 - irrelevant now */
      /* slot->outline.dropout_mode = 2; */
  
      return error;
    }
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
    /****                                                                 ****/
    /****                                                                 ****/
    /****             C H A R A C T E R   M A P P I N G S                 ****/
    /****                                                                 ****/
    /****                                                                 ****/
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
  
    static
    FT_Error  get_cff_glyph_name( CFF_Face    face,
                                  FT_UInt     glyph_index,
                                  FT_Pointer  buffer,
                                  FT_UInt     buffer_max )
    {
      CFF_Font*           font = (CFF_Font*)face->extra.data;
      FT_Memory           memory = FT_FACE_MEMORY(face);
      FT_String*          gname;
      FT_UShort           sid;
      PSNames_Interface*  psnames;
      FT_Error            error;
  
      psnames = (PSNames_Interface*)FT_Get_Module_Interface( face->root.driver->root.library, "psnames" );
  
      if ( !psnames )
      {
        FT_ERROR(( "CFF_Init_Face:" ));
        FT_ERROR(( " cannot open CFF & CEF fonts\n" ));
        FT_ERROR(( "             " ));
        FT_ERROR(( " without the `PSNames' module\n" ));
        error = FT_Err_Unknown_File_Format;
        goto Exit;
      }
  
      /* first, locate the sid in the charset table */
      sid = font->charset.sids[glyph_index];
  
      /* now, lookup the name itself */
      gname = CFF_Get_String( &font->string_index, sid, psnames );
  
      if ( buffer_max > 0 )
      {
        FT_UInt  len = strlen( gname );
  
  
        if (len >= buffer_max)
          len = buffer_max - 1;
  
        MEM_Copy( buffer, gname, len );
        ((FT_Byte*)buffer)[len] = 0;
      }
  
      FREE ( gname );
      error = CFF_Err_Ok;
  
      Exit:
        return error;
    }
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    Get_Char_Index                                                     */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Uses a charmap to return a given character code's glyph index.     */
    /*                                                                       */
    /* <Input>                                                               */
    /*    charmap  :: A handle to the source charmap object.                 */
    /*    charcode :: The character code.                                    */
    /*                                                                       */
    /* <Return>                                                              */
    /*    Glyph index.  0 means `undefined character code'.                  */
    /*                                                                       */
    static
    FT_UInt  cff_get_char_index( TT_CharMap  charmap,
                                 FT_Long     charcode )
    {
      FT_Error       error;
      CFF_Face       face;
      TT_CMapTable*  cmap;
  
  
      cmap = &charmap->cmap;
      face = (CFF_Face)charmap->root.face;
  
      /* Load table if needed */
      if ( !cmap->loaded )
      {
        SFNT_Interface*  sfnt = (SFNT_Interface*)face->sfnt;
  
  
        error = sfnt->load_charmap( face, cmap, face->root.stream );
        if ( error )
          return 0;
  
        cmap->loaded = TRUE;
      }
  
      return ( cmap->get_index ? cmap->get_index( cmap, charcode ) : 0 );
    }
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
    /****                                                                 ****/
    /****                                                                 ****/
    /****                D R I V E R  I N T E R F A C E                   ****/
    /****                                                                 ****/
    /****                                                                 ****/
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
  
    static
    FT_Module_Interface  cff_get_interface( CFF_Driver   driver,
                                            const char*  interface )
    {
      FT_Module  sfnt;
  
  #ifndef FT_CONFIG_OPTION_NO_GLYPH_NAMES
      if ( strcmp( (const char*)interface, "glyph_name" ) == 0 )
        return (FT_Module_Interface)get_cff_glyph_name;
  #endif
  
      /* we simply pass our request to the `sfnt' module */
      sfnt = FT_Get_Module( driver->root.root.library, "sfnt" );
  
      return sfnt ? sfnt->clazz->get_interface( sfnt, interface ) : 0;
    }
  
  
    /* The FT_DriverInterface structure is defined in ftdriver.h. */
  
    FT_CALLBACK_TABLE_DEF
    const FT_Driver_Class  cff_driver_class =
    {
      /* begin with the FT_Module_Class fields */
      {
        ft_module_font_driver | ft_module_driver_scalable,
        sizeof( CFF_DriverRec ),
        "cff",
        0x10000L,
        0x20000L,
  
        0,   /* module-specific interface */
  
        (FT_Module_Constructor)CFF_Init_Driver,
        (FT_Module_Destructor) CFF_Done_Driver,
        (FT_Module_Requester)  cff_get_interface,
      },
  
      /* now the specific driver fields */
      sizeof( TT_FaceRec ),
      sizeof( FT_SizeRec ),
      sizeof( CFF_GlyphSlotRec ),
  
      (FTDriver_initFace)     CFF_Init_Face,
      (FTDriver_doneFace)     CFF_Done_Face,
      (FTDriver_initSize)     0,
      (FTDriver_doneSize)     0,
      (FTDriver_initGlyphSlot)0,
      (FTDriver_doneGlyphSlot)0,
  
      (FTDriver_setCharSizes) 0,
      (FTDriver_setPixelSizes)0,
  
      (FTDriver_loadGlyph)    Load_Glyph,
      (FTDriver_getCharIndex) cff_get_char_index,
  
      (FTDriver_getKerning)   Get_Kerning,
      (FTDriver_attachFile)   0,
      (FTDriver_getAdvances)  0
    };
  
  
  #ifdef FT_CONFIG_OPTION_DYNAMIC_DRIVERS
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    getDriverClass                                                     */
    /*                                                                       */
    /* <Description>                                                         */
    /*    This function is used when compiling the TrueType driver as a      */
    /*    shared library (`.DLL' or `.so').  It will be used by the          */
    /*    high-level library of FreeType to retrieve the address of the      */
    /*    driver's generic interface.                                        */
    /*                                                                       */
    /*    It shouldn't be implemented in a static build, as each driver must */
    /*    have the same function as an exported entry point.                 */
    /*                                                                       */
    /* <Return>                                                              */
    /*    The address of the TrueType's driver generic interface.  The       */
    /*    format-specific interface can then be retrieved through the method */
    /*    interface->get_format_interface.                                   */
    /*                                                                       */
    FT_EXPORT_DEF( const FT_Driver_Class* )  getDriverClass( void )
    {
      return &cff_driver_class;
    }
  
  
  #endif /* CONFIG_OPTION_DYNAMIC_DRIVERS */
  
  
  /* END */
  

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