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

/*                                                                         */

/*  gxvmort0.c                                                             */

/*                                                                         */

/*    TrueTypeGX/AAT mort table validation                                 */

/*    body for type0 (Indic Script Rearrangement) 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 const char* GXV_Mort_IndicScript_Msg[] =

  {

    "no change",

    "Ax => xA",

    "xD => Dx",

    "AxD => DxA",

    "ABx => xAB",

    "ABx => xBA",

    "xCD => CDx",

    "xCD => DCx",

    "AxCD => CDxA",

    "AxCD => DCxA",

    "ABxD => DxAB",

    "ABxD => DxBA",

    "ABxCD => CDxAB",

    "ABxCD => CDxBA",

    "ABxCD => DCxAB",

    "ABxCD => DCxBA",



  };





  static void

  gxv_mort_subtable_type0_entry_validate(

    FT_Byte                         state,

    FT_UShort                       flags,

    GXV_StateTable_GlyphOffsetCPtr  glyphOffset_p,

    FT_Bytes                        table,

    FT_Bytes                        limit,

    GXV_Validator                   valid )

  {

    FT_UShort  markFirst;

    FT_UShort  dontAdvance;

    FT_UShort  markLast;

    FT_UShort  reserved;

    FT_UShort  verb = 0;



    FT_UNUSED( state );

    FT_UNUSED( table );

    FT_UNUSED( limit );



    FT_UNUSED( GXV_Mort_IndicScript_Msg[verb] ); /* for the non-debugging */

    FT_UNUSED( glyphOffset_p );                  /* case                  */





    markFirst   = (FT_UShort)( ( flags >> 15 ) & 1 );

    dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );

    markLast    = (FT_UShort)( ( flags >> 13 ) & 1 );



    reserved = (FT_UShort)( flags & 0x1FF0 );

    verb     = (FT_UShort)( flags & 0x000F );



    GXV_TRACE(( "  IndicScript MorphRule for glyphOffset 0x%04x",

                glyphOffset_p->u ));

    GXV_TRACE(( " markFirst=%01d", markFirst ));

    GXV_TRACE(( " dontAdvance=%01d", dontAdvance ));

    GXV_TRACE(( " markLast=%01d", markLast ));

    GXV_TRACE(( " %02d", verb ));

    GXV_TRACE(( " %s\n", GXV_Mort_IndicScript_Msg[verb] ));



    if ( 0 < reserved )

    {

      GXV_TRACE(( " non-zero bits found in reserved range\n" ));

      FT_INVALID_DATA;

    }

    else

      GXV_TRACE(( "\n" ));

  }





  FT_LOCAL_DEF( void )

  gxv_mort_subtable_type0_validate( FT_Bytes       table,

                                    FT_Bytes       limit,

                                    GXV_Validator  valid )

  {

    FT_Bytes  p = table;





    GXV_NAME_ENTER(

      "mort chain subtable type0 (Indic-Script Rearrangement)" );



    GXV_LIMIT_CHECK( GXV_STATETABLE_HEADER_SIZE );



    valid->statetable.optdata               = NULL;

    valid->statetable.optdata_load_func     = NULL;

    valid->statetable.subtable_setup_func   = NULL;

    valid->statetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_NONE;

    valid->statetable.entry_validate_func =

      gxv_mort_subtable_type0_entry_validate;



    gxv_StateTable_validate( p, limit, valid );



    GXV_EXIT;

  }





/* END */

