tttypes.h

可以在hge引擎中显示中文字体

    FT_Char  vertBearingY;
    FT_Byte  vertAdvance;

  } TT_SBit_MetricsRec, *TT_SBit_Metrics;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    TT_SBit_SmallMetricsRec                                            */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A structure used to hold the small metrics of a given glyph bitmap */
  /*    in a TrueType or OpenType font.  These are usually found in the    */
  /*    `EBDT' (Microsoft) or the `bdat' (Apple) table.                    */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    height   :: The glyph height in pixels.                            */
  /*                                                                       */
  /*    width    :: The glyph width in pixels.                             */
  /*                                                                       */
  /*    bearingX :: The left-side bearing.                                 */
  /*                                                                       */
  /*    bearingY :: The top-side bearing.                                  */
  /*                                                                       */
  /*    advance  :: The advance width or height.                           */
  /*                                                                       */
  typedef struct  TT_SBit_Small_Metrics_
  {
    FT_Byte  height;
    FT_Byte  width;

    FT_Char  bearingX;
    FT_Char  bearingY;
    FT_Byte  advance;

  } TT_SBit_SmallMetricsRec, *TT_SBit_SmallMetrics;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    TT_SBit_LineMetricsRec                                             */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A structure used to describe the text line metrics of a given      */
  /*    bitmap strike, for either a horizontal or vertical layout.         */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    ascender                :: The ascender in pixels.                 */
  /*                                                                       */
  /*    descender               :: The descender in pixels.                */
  /*                                                                       */
  /*    max_width               :: The maximum glyph width in pixels.      */
  /*                                                                       */
  /*    caret_slope_enumerator  :: Rise of the caret slope, typically set  */
  /*                               to 1 for non-italic fonts.              */
  /*                                                                       */
  /*    caret_slope_denominator :: Rise of the caret slope, typically set  */
  /*                               to 0 for non-italic fonts.              */
  /*                                                                       */
  /*    caret_offset            :: Offset in pixels to move the caret for  */
  /*                               proper positioning.                     */
  /*                                                                       */
  /*    min_origin_SB           :: Minimum of horiBearingX (resp.          */
  /*                               vertBearingY).                          */
  /*    min_advance_SB          :: Minimum of                              */
  /*                                                                       */
  /*                                 horizontal advance -                  */
  /*                                   ( horiBearingX + width )            */
  /*                                                                       */
  /*                               resp.                                   */
  /*                                                                       */
  /*                                 vertical advance -                    */
  /*                                   ( vertBearingY + height )           */
  /*                                                                       */
  /*    max_before_BL           :: Maximum of horiBearingY (resp.          */
  /*                               vertBearingY).                          */
  /*                                                                       */
  /*    min_after_BL            :: Minimum of                              */
  /*                                                                       */
  /*                                 horiBearingY - height                 */
  /*                                                                       */
  /*                               resp.                                   */
  /*                                                                       */
  /*                                 vertBearingX - width                  */
  /*                                                                       */
  /*    pads                    :: Unused (to make the size of the record  */
  /*                               a multiple of 32 bits.                  */
  /*                                                                       */
  typedef struct  TT_SBit_LineMetricsRec_
  {
    FT_Char  ascender;
    FT_Char  descender;
    FT_Byte  max_width;
    FT_Char  caret_slope_numerator;
    FT_Char  caret_slope_denominator;
    FT_Char  caret_offset;
    FT_Char  min_origin_SB;
    FT_Char  min_advance_SB;
    FT_Char  max_before_BL;
    FT_Char  min_after_BL;
    FT_Char  pads[2];

  } TT_SBit_LineMetricsRec, *TT_SBit_LineMetrics;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    TT_SBit_RangeRec                                                   */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A TrueType/OpenType subIndexTable as defined in the `EBLC'         */
  /*    (Microsoft) or `bloc' (Apple) tables.                              */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    first_glyph   :: The first glyph index in the range.               */
  /*                                                                       */
  /*    last_glyph    :: The last glyph index in the range.                */
  /*                                                                       */
  /*    index_format  :: The format of index table.  Valid values are 1    */
  /*                     to 5.                                             */
  /*                                                                       */
  /*    image_format  :: The format of `EBDT' image data.                  */
  /*                                                                       */
  /*    image_offset  :: The offset to image data in `EBDT'.               */
  /*                                                                       */
  /*    image_size    :: For index formats 2 and 5.  This is the size in   */
  /*                     bytes of each glyph bitmap.                       */
  /*                                                                       */
  /*    big_metrics   :: For index formats 2 and 5.  This is the big       */
  /*                     metrics for each glyph bitmap.                    */
  /*                                                                       */
  /*    num_glyphs    :: For index formats 4 and 5.  This is the number of */
  /*                     glyphs in the code array.                         */
  /*                                                                       */
  /*    glyph_offsets :: For index formats 1 and 3.                        */
  /*                                                                       */
  /*    glyph_codes   :: For index formats 4 and 5.                        */
  /*                                                                       */
  /*    table_offset  :: The offset of the index table in the `EBLC'       */
  /*                     table.  Only used during strike loading.          */
  /*                                                                       */
  typedef struct  TT_SBit_RangeRec
  {
    FT_UShort           first_glyph;
    FT_UShort           last_glyph;

    FT_UShort           index_format;
    FT_UShort           image_format;
    FT_ULong            image_offset;

    FT_ULong            image_size;
    TT_SBit_MetricsRec  metrics;
    FT_ULong            num_glyphs;

    FT_ULong*           glyph_offsets;
    FT_UShort*          glyph_codes;

    FT_ULong            table_offset;

  } TT_SBit_RangeRec, *TT_SBit_Range;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    TT_SBit_StrikeRec                                                  */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A structure used describe a given bitmap strike in the `EBLC'      */
  /*    (Microsoft) or `bloc' (Apple) tables.                              */
  /*                                                                       */
  /* <Fields>                                                              */
  /*   num_index_ranges :: The number of index ranges.                     */
  /*                                                                       */
  /*   index_ranges     :: An array of glyph index ranges.                 */
  /*                                                                       */
  /*   color_ref        :: Unused.  `color_ref' is put in for future       */
  /*                       enhancements, but these fields are already      */
  /*                       in use by other platforms (e.g. Newton).        */
  /*                       For details, please see                         */
  /*                                                                       */
  /*                         http://fonts.apple.com/                       */
  /*                                TTRefMan/RM06/Chap6bloc.html           */
  /*                                                                       */
  /*   hori             :: The line metrics for horizontal layouts.        */
  /*                                                                       */
  /*   vert             :: The line metrics for vertical layouts.          */
  /*                                                                       */
  /*   start_glyph      :: The lowest glyph index for this strike.         */
  /*                                                                       */
  /*   end_glyph        :: The highest glyph index for this strike.        */
  /*                                                                       */
  /*   x_ppem           :: The number of horizontal pixels per EM.         */
  /*                                                                       */
  /*   y_ppem           :: The number of vertical pixels per EM.           */
  /*                                                                       */
  /*   bit_depth        :: The bit depth.  Valid values are 1, 2, 4,       */
  /*                       and 8.                                          */
  /*                                                                       */
  /*   flags            :: Is this a vertical or horizontal strike?  For   */
  /*                       details, please see                             */
  /*                                                                       */
  /*                         http://fonts.apple.com/                       */
  /*                                TTRefMan/RM06/Chap6bloc.html           */
  /*                                                                       */
  typedef struct  TT_SBit_StrikeRec_
  {
    FT_Int                  num_ranges;
    TT_SBit_Range           sbit_ranges;
    FT_ULong                ranges_offset;

    FT_ULong                color_ref;

    TT_SBit_LineMetricsRec  hori;
    TT_SBit_LineMetricsRec  vert;

    FT_UShort               start_glyph;
    FT_UShort               end_glyph;