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

/*                                                                         */

/*  gxvmort4.c                                                             */

/*                                                                         */

/*    TrueTypeGX/AAT mort table validation                                 */

/*    body for type4 (Non-Contextual Glyph Substitution) subtable.         */

/*                                                                         */

/*  Copyright 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K.,       */

/*  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.                                        */

/*                                                                         */

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



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

/*                                                                         */

/* gxvalid is derived from both gxlayout module and otvalid module.        */

/* Development of gxlayout is supported by the Information-technology      */

/* Promotion Agency(IPA), Japan.                                           */

/*                                                                         */

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





#include "gxvmort.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_gxvmort





  static void

  gxv_mort_subtable_type4_lookupval_validate( FT_UShort            glyph,

                                              GXV_LookupValueCPtr  value_p,

                                              GXV_Validator        valid )

  {

    FT_UNUSED( glyph );



    gxv_glyphid_validate( value_p->u, valid );

  }



  /*

    +===============+ --------+

    | lookup header |         |

    +===============+         |

    | BinSrchHeader |         |

    +===============+         |

    | lastGlyph[0]  |         |

    +---------------+         |

    | firstGlyph[0] |         |    head of lookup table

    +---------------+         |             +

    | offset[0]     |    ->   |          offset            [byte]

    +===============+         |             +

    | lastGlyph[1]  |         | (glyphID - firstGlyph) * 2 [byte]

    +---------------+         |

    | firstGlyph[1] |         |

    +---------------+         |

    | offset[1]     |         |

    +===============+         |

                              |

     ....                     |

                              |

    16bit value array         |

    +===============+         |

    |     value     | <-------+

     ....

  */



  static GXV_LookupValueDesc

  gxv_mort_subtable_type4_lookupfmt4_transit(

    FT_UShort            relative_gindex,

    GXV_LookupValueCPtr  base_value_p,

    FT_Bytes             lookuptbl_limit,

    GXV_Validator        valid )

  {

    FT_Bytes             p;

    FT_Bytes             limit;

    FT_UShort            offset;

    GXV_LookupValueDesc  value;



    /* XXX: check range? */

    offset = (FT_UShort)( base_value_p->u +

                          relative_gindex * sizeof ( FT_UShort ) );



    p     = valid->lookuptbl_head + offset;

    limit = lookuptbl_limit;



    GXV_LIMIT_CHECK( 2 );

    value.u = FT_NEXT_USHORT( p );



    return value;

  }





  FT_LOCAL_DEF( void )

  gxv_mort_subtable_type4_validate( FT_Bytes       table,

                                    FT_Bytes       limit,

                                    GXV_Validator  valid )

  {

    FT_Bytes  p = table;





    GXV_NAME_ENTER( "mort chain subtable type4 "

                    "(Non-Contextual Glyph Substitution)" );



    valid->lookupval_sign   = GXV_LOOKUPVALUE_UNSIGNED;

    valid->lookupval_func   = gxv_mort_subtable_type4_lookupval_validate;

    valid->lookupfmt4_trans = gxv_mort_subtable_type4_lookupfmt4_transit;



    gxv_LookupTable_validate( p, limit, valid );



    GXV_EXIT;

  }





/* END */

