ttmtx.h File Reference

#include <ft2build.h>

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Functions
FT_BEGIN_HEADER	tt_face_load_hhea (TT_Face face, FT_Stream stream, FT_Bool vertical)
	tt_face_load_hmtx (TT_Face face, FT_Stream stream, FT_Bool vertical)
	tt_face_get_metrics (TT_Face face, FT_Bool vertical, FT_UInt gindex, FT_Short *abearing, FT_UShort *aadvance)

Function Documentation

tt_face_get_metrics()

tt_face_get_metrics	(	TT_Face	face,
		FT_Bool	vertical,
		FT_UInt	gindex,
		FT_Short *	abearing,
		FT_UShort *	aadvance
	)

Definition at line 218 of file ttmtx.c.

  {
    FT_Error        error;
    FT_Stream       stream = face->root.stream;
    TT_HoriHeader*  header;
    FT_ULong        table_pos, table_size, table_end;
    FT_UShort       k;

#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
    FT_Service_MetricsVariations  var =
      (FT_Service_MetricsVariations)face->var;
#endif


    if ( vertical )
    {
      void*  v = &face->vertical;


      header     = (TT_HoriHeader*)v;
      table_pos  = face->vert_metrics_offset;
      table_size = face->vert_metrics_size;
    }
    else
    {
      header     = &face->horizontal;
      table_pos  = face->horz_metrics_offset;
      table_size = face->horz_metrics_size;
    }

    table_end = table_pos + table_size;

    k = header->number_Of_HMetrics;

    if ( k > 0 )
    {
      if ( gindex < (FT_UInt)k )
      {
        table_pos += 4 * gindex;
        if ( table_pos + 4 > table_end )
          goto NoData;

        if ( FT_STREAM_SEEK( table_pos ) ||
             FT_READ_USHORT( *aadvance ) ||
             FT_READ_SHORT( *abearing )  )
          goto NoData;
      }
      else
      {
        table_pos += 4 * ( k - 1 );
        if ( table_pos + 4 > table_end )
          goto NoData;

        if ( FT_STREAM_SEEK( table_pos ) ||
             FT_READ_USHORT( *aadvance ) )
          goto NoData;

        table_pos += 4 + 2 * ( gindex - k );
        if ( table_pos + 2 > table_end )
          *abearing = 0;
        else
        {
          if ( !FT_STREAM_SEEK( table_pos ) )
            (void)FT_READ_SHORT( *abearing );
        }
      }
    }
    else
    {
    NoData:
      *abearing = 0;
      *aadvance = 0;
    }

#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
    if ( var )
    {
      FT_Face  f = FT_FACE( face );
      FT_Int   a = (FT_Int)*aadvance;
      FT_Int   b = (FT_Int)*abearing;


      if ( vertical )
      {
        if ( var->vadvance_adjust )
          var->vadvance_adjust( f, gindex, &a );
        if ( var->tsb_adjust )
          var->tsb_adjust( f, gindex, &b );
      }
      else
      {
        if ( var->hadvance_adjust )
          var->hadvance_adjust( f, gindex, &a );
        if ( var->lsb_adjust )
          var->lsb_adjust( f, gindex, &b );
      }

      *aadvance = (FT_UShort)a;
      *abearing = (FT_Short)b;
    }
#endif
  }

tt_face_load_hhea()

FT_BEGIN_HEADER tt_face_load_hhea	(	TT_Face	face,
		FT_Stream	stream,
		FT_Bool	vertical
	)

Definition at line 124 of file ttmtx.c.

  {
    FT_Error        error;
    TT_HoriHeader*  header;

    static const FT_Frame_Field  metrics_header_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  TT_HoriHeader

      FT_FRAME_START( 36 ),
        FT_FRAME_ULONG ( Version ),
        FT_FRAME_SHORT ( Ascender ),
        FT_FRAME_SHORT ( Descender ),
        FT_FRAME_SHORT ( Line_Gap ),
        FT_FRAME_USHORT( advance_Width_Max ),
        FT_FRAME_SHORT ( min_Left_Side_Bearing ),
        FT_FRAME_SHORT ( min_Right_Side_Bearing ),
        FT_FRAME_SHORT ( xMax_Extent ),
        FT_FRAME_SHORT ( caret_Slope_Rise ),
        FT_FRAME_SHORT ( caret_Slope_Run ),
        FT_FRAME_SHORT ( caret_Offset ),
        FT_FRAME_SHORT ( Reserved[0] ),
        FT_FRAME_SHORT ( Reserved[1] ),
        FT_FRAME_SHORT ( Reserved[2] ),
        FT_FRAME_SHORT ( Reserved[3] ),
        FT_FRAME_SHORT ( metric_Data_Format ),
        FT_FRAME_USHORT( number_Of_HMetrics ),
      FT_FRAME_END
    };


    if ( vertical )
    {
      void  *v = &face->vertical;


      error = face->goto_table( face, TTAG_vhea, stream, 0 );
      if ( error )
        goto Fail;

      header = (TT_HoriHeader*)v;
    }
    else
    {
      error = face->goto_table( face, TTAG_hhea, stream, 0 );
      if ( error )
        goto Fail;

      header = &face->horizontal;
    }

    if ( FT_STREAM_READ_FIELDS( metrics_header_fields, header ) )
      goto Fail;

    FT_TRACE3(( "Ascender:          %5d\n", header->Ascender ));
    FT_TRACE3(( "Descender:         %5d\n", header->Descender ));
    FT_TRACE3(( "number_Of_Metrics: %5u\n", header->number_Of_HMetrics ));

    header->long_metrics  = NULL;
    header->short_metrics = NULL;

  Fail:
    return error;
  }

tt_face_load_hmtx()

tt_face_load_hmtx	(	TT_Face	face,
		FT_Stream	stream,
		FT_Bool	vertical
	)

Definition at line 70 of file ttmtx.c.

  {
    FT_Error   error;
    FT_ULong   tag, table_size;
    FT_ULong*  ptable_offset;
    FT_ULong*  ptable_size;


    if ( vertical )
    {
      tag           = TTAG_vmtx;
      ptable_offset = &face->vert_metrics_offset;
      ptable_size   = &face->vert_metrics_size;
    }
    else
    {
      tag           = TTAG_hmtx;
      ptable_offset = &face->horz_metrics_offset;
      ptable_size   = &face->horz_metrics_size;
    }

    error = face->goto_table( face, tag, stream, &table_size );
    if ( error )
      goto Fail;

    *ptable_size   = table_size;
    *ptable_offset = FT_STREAM_POS();

  Fail:
    return error;
  }