ftglyph.h

winNT技术操作系统,国外开放的原代码和LIUX一样

  /*                                                                       */
  /*    Note that the maximum coordinates are exclusive, which means that  */
  /*    one can compute the width and height of the glyph image (be it in  */
  /*    integer or 26.6 pixels) as:                                        */
  /*                                                                       */
  /*    {                                                                  */
  /*      width  = bbox.xMax - bbox.xMin;                                  */
  /*      height = bbox.yMax - bbox.yMin;                                  */
  /*    }                                                                  */
  /*                                                                       */
  /*    Note also that for 26.6 coordinates, if `bbox_mode' is set to      */
  /*    @FT_GLYPH_BBOX_GRIDFIT, the coordinates will also be grid-fitted,  */
  /*    which corresponds to:                                              */
  /*                                                                       */
  /*    {                                                                  */
  /*      bbox.xMin = FLOOR(bbox.xMin);                                    */
  /*      bbox.yMin = FLOOR(bbox.yMin);                                    */
  /*      bbox.xMax = CEILING(bbox.xMax);                                  */
  /*      bbox.yMax = CEILING(bbox.yMax);                                  */
  /*    }                                                                  */
  /*                                                                       */
  /*    To get the bbox in pixel coordinates, set `bbox_mode' to           */
  /*    @FT_GLYPH_BBOX_TRUNCATE.                                           */
  /*                                                                       */
  /*    To get the bbox in grid-fitted pixel coordinates, set `bbox_mode'  */
  /*    to @FT_GLYPH_BBOX_PIXELS.                                          */
  /*                                                                       */
  FT_EXPORT( void )
  FT_Glyph_Get_CBox( FT_Glyph  glyph,
                     FT_UInt   bbox_mode,
                     FT_BBox  *acbox );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Glyph_To_Bitmap                                                 */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Converts a given glyph object to a bitmap glyph object.            */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    the_glyph   :: A pointer to a handle to the target glyph.          */
  /*                                                                       */
  /* <Input>                                                               */
  /*    render_mode :: An enumeration that describe how the data is        */
  /*                   rendered.                                           */
  /*                                                                       */
  /*    origin      :: A pointer to a vector used to translate the glyph   */
  /*                   image before rendering.  Can be 0 (if no            */
  /*                   translation).  The origin is expressed in           */
  /*                   26.6 pixels.                                        */
  /*                                                                       */
  /*    destroy     :: A boolean that indicates that the original glyph    */
  /*                   image should be destroyed by this function.  It is  */
  /*                   never destroyed in case of error.                   */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  /* <Note>                                                                */
  /*    The glyph image is translated with the `origin' vector before      */
  /*    rendering.                                                         */
  /*                                                                       */
  /*    The first parameter is a pointer to an @FT_Glyph handle, that will */
  /*    be replaced by this function.  Typically, you would use (omitting  */
  /*    error handling):                                                   */
  /*                                                                       */
  /*                                                                       */
  /*      {                                                                */
  /*        FT_Glyph        glyph;                                         */
  /*        FT_BitmapGlyph  glyph_bitmap;                                  */
  /*                                                                       */
  /*                                                                       */
  /*        // load glyph                                                  */
  /*        error = FT_Load_Char( face, glyph_index, FT_LOAD_DEFAUT );     */
  /*                                                                       */
  /*        // extract glyph image                                         */
  /*        error = FT_Get_Glyph( face->glyph, &glyph );                   */
  /*                                                                       */
  /*        // convert to a bitmap (default render mode + destroy old)     */
  /*        if ( glyph->format != FT_GLYPH_FORMAT_BITMAP )                 */
  /*        {                                                              */
  /*          error = FT_Glyph_To_Bitmap( &glyph, FT_RENDER_MODE_DEFAULT,  */
  /*                                      0, 1 );                          */
  /*          if ( error ) // glyph unchanged                              */
  /*            ...                                                        */
  /*        }                                                              */
  /*                                                                       */
  /*        // access bitmap content by typecasting                        */
  /*        glyph_bitmap = (FT_BitmapGlyph)glyph;                          */
  /*                                                                       */
  /*        // do funny stuff with it, like blitting/drawing               */
  /*        ...                                                            */
  /*                                                                       */
  /*        // discard glyph image (bitmap or not)                         */
  /*        FT_Done_Glyph( glyph );                                        */
  /*      }                                                                */
  /*                                                                       */
  /*                                                                       */
  /*    This function does nothing if the glyph format isn't scalable.     */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Glyph_To_Bitmap( FT_Glyph*       the_glyph,
                      FT_Render_Mode  render_mode,
                      FT_Vector*      origin,
                      FT_Bool         destroy );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Done_Glyph                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Destroys a given glyph.                                            */
  /*                                                                       */
  /* <Input>                                                               */
  /*    glyph :: A handle to the target glyph object.                      */
  /*                                                                       */
  FT_EXPORT( void )
  FT_Done_Glyph( FT_Glyph  glyph );

  /* */


  /* other helpful functions */

  /*************************************************************************/
  /*                                                                       */
  /* <Section>                                                             */
  /*    computations                                                       */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Matrix_Multiply                                                 */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Performs the matrix operation `b = a*b'.                           */
  /*                                                                       */
  /* <Input>                                                               */
  /*    a :: A pointer to matrix `a'.                                      */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    b :: A pointer to matrix `b'.                                      */
  /*                                                                       */
  /* <Note>                                                                */
  /*    The result is undefined if either `a' or `b' is zero.              */
  /*                                                                       */
  FT_EXPORT( void )
  FT_Matrix_Multiply( const FT_Matrix*  a,
                      FT_Matrix*  b );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Matrix_Invert                                                   */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Inverts a 2x2 matrix.  Returns an error if it can't be inverted.   */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    matrix :: A pointer to the target matrix.  Remains untouched in    */
  /*              case of error.                                           */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Matrix_Invert( FT_Matrix*  matrix );


  /* */


FT_END_HEADER

#endif /* __FTGLYPH_H__ */


/* END */


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