ftoutln.h

一个Xpdf应用的例子

  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Outline_Get_CBox                                                */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Returns an outline's `control box'.  The control box encloses all  */
  /*    the outline's points, including Bezier control points.  Though it  */
  /*    coincides with the exact bounding box for most glyphs, it can be   */
  /*    slightly larger in some situations (like when rotating an outline  */
  /*    which contains Bezier outside arcs).                               */
  /*                                                                       */
  /*    Computing the control box is very fast, while getting the bounding */
  /*    box can take much more time as it needs to walk over all segments  */
  /*    and arcs in the outline.  To get the latter, you can use the       */
  /*    `ftbbox' component which is dedicated to this single task.         */
  /*                                                                       */
  /* <Input>                                                               */
  /*    outline :: A pointer to the source outline descriptor.             */
  /*                                                                       */
  /* <Output>                                                              */
  /*    acbox   :: The outline's control box.                              */
  /*                                                                       */
  FT_EXPORT( void )
  FT_Outline_Get_CBox( FT_Outline*  outline,
                       FT_BBox     *acbox );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Outline_Translate                                               */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Applies a simple translation to the points of an outline.          */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    outline :: A pointer to the target outline descriptor.             */
  /*                                                                       */
  /* <Input>                                                               */
  /*    xOffset :: The horizontal offset.                                  */
  /*                                                                       */
  /*    yOffset :: The vertical offset.                                    */
  /*                                                                       */
  FT_EXPORT( void )
  FT_Outline_Translate( FT_Outline*  outline,
                        FT_Pos       xOffset,
                        FT_Pos       yOffset );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Outline_Copy                                                    */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Copies an outline into another one.  Both objects must have the    */
  /*    same sizes (number of points & number of contours) when this       */
  /*    function is called.                                                */
  /*                                                                       */
  /* <Input>                                                               */
  /*    source :: A handle to the source outline.                          */
  /*                                                                       */
  /* <Output>                                                              */
  /*    target :: A handle to the target outline.                          */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Outline_Copy( FT_Outline*  source,
                   FT_Outline  *target );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Outline_Transform                                               */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Applies a simple 2x2 matrix to all of an outline's points.  Useful */
  /*    for applying rotations, slanting, flipping, etc.                   */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    outline :: A pointer to the target outline descriptor.             */
  /*                                                                       */
  /* <Input>                                                               */
  /*    matrix  :: A pointer to the transformation matrix.                 */
  /*                                                                       */
  /* <Note>                                                                */
  /*    You can use FT_Outline_Translate() if you need to translate the    */
  /*    outline's points.                                                  */
  /*                                                                       */
  FT_EXPORT( void )
  FT_Outline_Transform( FT_Outline*  outline,
                        FT_Matrix*   matrix );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Outline_Reverse                                                 */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Reverses the drawing direction of an outline.  This is used to     */
  /*    ensure consistent fill conventions for mirrored glyphs.            */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    outline :: A pointer to the target outline descriptor.             */
  /*                                                                       */
  /* <Note>                                                                */
  /*    This functions toggles the bit flag `ft_outline_reverse_fill' in   */
  /*    the outline's `flags' field.                                       */
  /*                                                                       */
  /*    It shouldn't be used by a normal client application, unless it     */
  /*    knows what it is doing.                                            */
  /*                                                                       */
  FT_EXPORT( void )
  FT_Outline_Reverse( FT_Outline*  outline );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Outline_Get_Bitmap                                              */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Renders an outline within a bitmap.  The outline's image is simply */
  /*    OR-ed to the target bitmap.                                        */
  /*                                                                       */
  /* <Input>                                                               */
  /*    library :: A handle to a FreeType library object.                  */
  /*                                                                       */
  /*    outline :: A pointer to the source outline descriptor.             */
  /*                                                                       */
  /* <Output>                                                              */
  /*    abitmap :: A pointer to the target bitmap descriptor.              */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  /* <Note>                                                                */
  /*    This function does NOT CREATE the bitmap, it only renders an       */
  /*    outline image within the one you pass to it!                       */
  /*                                                                       */
  /*    It will use the raster correponding to the default glyph format.   */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Outline_Get_Bitmap( FT_Library   library,
                         FT_Outline*  outline,
                         FT_Bitmap   *abitmap );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Outline_Render                                                  */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Renders an outline within a bitmap using the current scan-convert. */
  /*    This functions uses an FT_Raster_Params structure as an argument,  */
  /*    allowing advanced features like direct composition, translucency,  */
  /*    etc.                                                               */
  /*                                                                       */
  /* <Input>                                                               */
  /*    library :: A handle to a FreeType library object.                  */
  /*                                                                       */
  /*    outline :: A pointer to the source outline descriptor.             */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    params  :: A pointer to a FT_Raster_Params structure used to       */
  /*               describe the rendering operation.                       */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  /* <Note>                                                                */
  /*    You should know what you are doing and how FT_Raster_Params works  */
  /*    to use this function.                                              */
  /*                                                                       */
  /*    The field `params.source' will be set to `outline' before the scan */
  /*    converter is called, which means that the value you give to it is  */
  /*    actually ignored.                                                  */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Outline_Render( FT_Library         library,
                     FT_Outline*        outline,
                     FT_Raster_Params*  params );


  /* */


FT_END_HEADER

#endif /* __FTOUTLN_H__ */


/* END */