/***************************************************************************/
/*                                                                         */
/*  ftimage.h                                                              */
/*                                                                         */
/*    FreeType glyph image formats and default raster interface            */
/*    (specification).                                                     */
/*                                                                         */
/*  Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,   */
/*            2010 by                                                      */
/*  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.                                        */
/*                                                                         */
/***************************************************************************/

  /*************************************************************************/
  /*                                                                       */
  /* Note: A `raster' is simply a scan-line converter, used to render      */
  /*       FT_Outlines into FT_Bitmaps.                                    */
  /*                                                                       */
  /*************************************************************************/


#ifndef __FTIMAGE_H__
#define __FTIMAGE_H__


  /* _STANDALONE_ is from ftgrays.c */
#ifndef _STANDALONE_
#include <ft2build.h>
#endif


FT_BEGIN_HEADER


  /*************************************************************************/
  /*                                                                       */
  /* <Section>                                                             */
  /*    basic_types                                                        */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Type>                                                                */
  /*    FT_Pos                                                             */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The type FT_Pos is used to store vectorial coordinates.  Depending */
  /*    on the context, these can represent distances in integer font      */
  /*    units, or 16.16, or 26.6 fixed float pixel coordinates.            */
  /*                                                                       */
  typedef signed long  FT_Pos;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    FT_Vector                                                          */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A simple structure used to store a 2D vector; coordinates are of   */
  /*    the FT_Pos type.                                                   */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    x :: The horizontal coordinate.                                    */
  /*    y :: The vertical coordinate.                                      */
  /*                                                                       */
  typedef struct  FT_Vector_
  {
    FT_Pos  x;
    FT_Pos  y;

  } FT_Vector;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    FT_BBox                                                            */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A structure used to hold an outline's bounding box, i.e., the      */
  /*    coordinates of its extrema in the horizontal and vertical          */
  /*    directions.                                                        */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    xMin :: The horizontal minimum (left-most).                        */
  /*                                                                       */
  /*    yMin :: The vertical minimum (bottom-most).                        */
  /*                                                                       */
  /*    xMax :: The horizontal maximum (right-most).                       */
  /*                                                                       */
  /*    yMax :: The vertical maximum (top-most).                           */
  /*                                                                       */
  /* <Note>                                                                */
  /*    The bounding box is specified with the coordinates of the lower    */
  /*    left and the upper right corner.  In PostScript, those values are  */
  /*    often called (llx,lly) and (urx,ury), respectively.                */
  /*                                                                       */
  /*    If `yMin' is negative, this value gives the glyph's descender.     */
  /*    Otherwise, the glyph doesn't descend below the baseline.           */
  /*    Similarly, if `ymax' is positive, this value gives the glyph's     */
  /*    ascender.                                                          */
  /*                                                                       */
  /*    `xMin' gives the horizontal distance from the glyph's origin to    */
  /*    the left edge of the glyph's bounding box.  If `xMin' is negative, */
  /*    the glyph extends to the left of the origin.                       */
  /*                                                                       */
  typedef struct  FT_BBox_
  {
    FT_Pos  xMin, yMin;
    FT_Pos  xMax, yMax;

  } FT_BBox;


  /*************************************************************************/
  /*                                                                       */
  /* <Enum>                                                                */
  /*    FT_Pixel_Mode                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    An enumeration type used to describe the format of pixels in a     */
  /*    given bitmap.  Note that additional formats may be added in the    */
  /*    future.                                                            */
  /*                                                                       */
  /* <Values>                                                              */
  /*    FT_PIXEL_MODE_NONE ::                                              */
  /*      Value~0 is reserved.                                             */
  /*                                                                       */
  /*    FT_PIXEL_MODE_MONO ::                                              */
  /*      A monochrome bitmap, using 1~bit per pixel.  Note that pixels    */
  /*      are stored in most-significant order (MSB), which means that     */
  /*      the left-most pixel in a byte has value 128.                     */
  /*                                                                       */
  /*    FT_PIXEL_MODE_GRAY ::                                              */
  /*      An 8-bit bitmap, generally used to represent anti-aliased glyph  */
  /*      images.  Each pixel is stored in one byte.  Note that the number */
  /*      of `gray' levels is stored in the `num_grays' field of the       */
  /*      @FT_Bitmap structure (it generally is 256).                      */
  /*                                                                       */
  /*    FT_PIXEL_MODE_GRAY2 ::                                             */
  /*      A 2-bit per pixel bitmap, used to represent embedded             */
  /*      anti-aliased bitmaps in font files according to the OpenType     */
  /*      specification.  We haven't found a single font using this        */
  /*      format, however.                                                 */
  /*                                                                       */
  /*    FT_PIXEL_MODE_GRAY4 ::                                             */
  /*      A 4-bit per pixel bitmap, representing embedded anti-aliased     */
  /*      bitmaps in font files according to the OpenType specification.   */
  /*      We haven't found a single font using this format, however.       */
  /*                                                                       */
  /*    FT_PIXEL_MODE_LCD ::                                               */
  /*      An 8-bit bitmap, representing RGB or BGR decimated glyph images  */
  /*      used for display on LCD displays; the bitmap is three times      */
  /*      wider than the original glyph image.  See also                   */
  /*      @FT_RENDER_MODE_LCD.                                             */
  /*                                                                       */
  /*    FT_PIXEL_MODE_LCD_V ::                                             */
  /*      An 8-bit bitmap, representing RGB or BGR decimated glyph images  */
  /*      used for display on rotated LCD displays; the bitmap is three    */
  /*      times taller than the original glyph image.  See also            */
  /*      @FT_RENDER_MODE_LCD_V.                                           */
  /*                                                                       */
  typedef enum  FT_Pixel_Mode_
  {
    FT_PIXEL_MODE_NONE = 0,
    FT_PIXEL_MODE_MONO,
    FT_PIXEL_MODE_GRAY,
    FT_PIXEL_MODE_GRAY2,
    FT_PIXEL_MODE_GRAY4,
    FT_PIXEL_MODE_LCD,
    FT_PIXEL_MODE_LCD_V,

    FT_PIXEL_MODE_MAX      /* do not remove */

  } FT_Pixel_Mode;


  /*************************************************************************/
  /*                                                                       */
  /* <Enum>                                                                */
  /*    ft_pixel_mode_xxx                                                  */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A list of deprecated constants.  Use the corresponding             */
  /*    @FT_Pixel_Mode values instead.                                     */
  /*                                                                       */
  /* <Values>                                                              */
  /*    ft_pixel_mode_none  :: See @FT_PIXEL_MODE_NONE.                    */
  /*    ft_pixel_mode_mono  :: See @FT_PIXEL_MODE_MONO.                    */
  /*    ft_pixel_mode_grays :: See @FT_PIXEL_MODE_GRAY.                    */
  /*    ft_pixel_mode_pal2  :: See @FT_PIXEL_MODE_GRAY2.                   */
  /*    ft_pixel_mode_pal4  :: See @FT_PIXEL_MODE_GRAY4.                   */
  /*                                                                       */
#define ft_pixel_mode_none   FT_PIXEL_MODE_NONE
#define ft_pixel_mode_mono   FT_PIXEL_MODE_MONO
#define ft_pixel_mode_grays  FT_PIXEL_MODE_GRAY
#define ft_pixel_mode_pal2   FT_PIXEL_MODE_GRAY2
#define ft_pixel_mode_pal4   FT_PIXEL_MODE_GRAY4

 /* */

#if 0

  /*************************************************************************/
  /*                                                                       */
  /* <Enum>                                                                */
  /*    FT_Palette_Mode                                                    */
  /*                                                                       */
  /* <Description>                                                         */
  /*    THIS TYPE IS DEPRECATED.  DO NOT USE IT!                           */
  /*                                                                       */
  /*    An enumeration type to describe the format of a bitmap palette,    */
  /*    used with ft_pixel_mode_pal4 and ft_pixel_mode_pal8.               */
  /*                                                                       */
  /* <Values>                                                              */
  /*    ft_palette_mode_rgb  :: The palette is an array of 3-byte RGB      */
  /*                            records.                                   */
  /*                                                                       */
  /*    ft_palette_mode_rgba :: The palette is an array of 4-byte RGBA     */
  /*                            records.                                   */
  /*                                                                       */
  /* <Note>                                                                */
  /*    As ft_pixel_mode_pal2, pal4 and pal8 are currently unused by       */
  /*    FreeType, these types are not handled by the library itself.       */
  /*                                                                       */
  typedef enum  FT_Palette_Mode_
  {
    ft_palette_mode_rgb = 0,
    ft_palette_mode_rgba,

    ft_palette_mode_max   /* do not remove */

  } FT_Palette_Mode;

  /* */

#endif


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    FT_Bitmap                                                          */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A structure used to describe a bitmap or pixmap to the raster.     */
  /*    Note that we now manage pixmaps of various depths through the      */
  /*    `pixel_mode' field.                                                */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    rows         :: The number of bitmap rows.                         */
  /*                                                                       */
  /*    width        :: The number of pixels in bitmap row.                */
  /*                                                                       */
  /*    pitch        :: The pitch's absolute value is the number of bytes  */
  /*                    taken by one bitmap row, including padding.        */
  /*                    However, the pitch is positive when the bitmap has */
  /*                    a `down' flow, and negative when it has an `up'    */
  /*                    flow.  In all cases, the pitch is an offset to add */
  /*                    to a bitmap pointer in order to go down one row.   */
  /*                                                                       */
  /*                    Note that `padding' means the alignment of a       */
  /*                    bitmap to a byte border, and FreeType functions    */
  /*                    normally align to the smallest possible integer    */
  /*                    value.                                             */
  /*                                                                       */
  /*                    For the B/W rasterizer, `pitch' is always an even  */
  /*                    number.                                            */
  /*                                                                       */
  /*                    To change the pitch of a bitmap (say, to make it a */
  /*                    multiple of 4), use @FT_Bitmap_Convert.            */
  /*                    Alternatively, you might use callback functions to */
  /*                    directly render to the application's surface; see  */
  /*                    the file `example2.cpp' in the tutorial for a      */
  /*                    demonstration.                                     */
  /*                                                                       */
  /*    buffer       :: A typeless pointer to the bitmap buffer.  This     */
  /*                    value should be aligned on 32-bit boundaries in    */
  /*                    most cases.                                        */
  /*                                                                       */
  /*    num_grays    :: This field is only used with                       */
  /*                    @FT_PIXEL_MODE_GRAY; it gives the number of gray   */
  /*                    levels used in the bitmap.                         */
  /*                                                                       */
  /*    pixel_mode   :: The pixel mode, i.e., how pixel bits are stored.   */
  /*                    See @FT_Pixel_Mode for possible values.            */
  /*                                                                       */
  /*    palette_mode :: This field is intended for paletted pixel modes;   */
  /*                    it indicates how the palette is stored.  Not       */
  /*                    used currently.                                    */
  /*                                                                       */
  /*    palette      :: A typeless pointer to the bitmap palette; this     */
  /*                    field is intended for paletted pixel modes.  Not   */
  /*                    used currently.                                    */
  /*                                                                       */
  /* <Note>                                                                */
  /*   For now, the only pixel modes supported by FreeType are mono and    */
  /*   grays.  However, drivers might be added in the future to support    */
  /*   more `colorful' options.                                            */
  /*                                                                       */
  typedef struct  FT_Bitmap_
  {
    int             rows;
    int             width;
    int             pitch;
    unsigned char*  buffer;
    short           num_grays;
    char            pixel_mode;
    char            palette_mode;
    void*           palette;

  } FT_Bitmap;


  /*************************************************************************/
  /*                                                                       */
  /* <Section>                                                             */
  /*    outline_processing                                                 */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    FT_Outline                                                         */
  /*                                                                       */
  /* <Description>                                                         */
  /*    This structure is used to describe an outline to the scan-line     */
  /*    converter.                                                         */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    n_contours :: The number of contours in the outline.               */
  /*                                                                       */
  /*    n_points   :: The number of points in the outline.                 */
  /*                                                                       */
  /*    points     :: A pointer to an array of `n_points' @FT_Vector       */
  /*                  elements, giving the outline's point coordinates.    */
  /*                                                                       */
  /*    tags       :: A pointer to an array of `n_points' chars, giving    */
  /*                  each outline point's type.                           */
  /*                                                                       */
  /*                  If bit~0 is unset, the point is `off' the curve,     */
  /*                  i.e., a Bézier control point, while it is `on' if    */
  /*                  set.                                                 */
  /*                                                                       */
  /*                  Bit~1 is meaningful for `off' points only.  If set,  */
  /*                  it indicates a third-order Bézier arc control point; */
  /*                  and a second-order control point if unset.           */
  /*                                                                       */
  /*                  If bit~2 is set, bits 5-7 contain the drop-out mode  */
  /*                  (as defined in the OpenType specification; the value */
  /*                  is the same as the argument to the SCANMODE          */
  /*                  instruction).                                        */
  /*                                                                       */
  /*                  Bits 3 and~4 are reserved for internal purposes.     */
  /*                                                                       */
  /*    contours   :: An array of `n_contours' shorts, giving the end      */
  /*                  point of each contour within the outline.  For       */
  /*                  example, the first contour is defined by the points  */
  /*                  `0' to `contours[0]', the second one is defined by   */
  /*                  the points `contours[0]+1' to `contours[1]', etc.    */
  /*                                                                       */
  /*    flags      :: A set of bit flags used to characterize the outline  */
  /*                  and give hints to the scan-converter and hinter on   */
  /*                  how to convert/grid-fit it.  See @FT_OUTLINE_FLAGS.  */
  /*                                                                       */
  /* <Note>                                                                */
  /*    The B/W rasterizer only checks bit~2 in the `tags' array for the   */
  /*    first point of each contour.  The drop-out mode as given with      */
  /*    @FT_OUTLINE_IGNORE_DROPOUTS, @FT_OUTLINE_SMART_DROPOUTS, and       */
  /*    @FT_OUTLINE_INCLUDE_STUBS in `flags' is then overridden.           */
  /*                                                                       */
  typedef struct  FT_Outline_
  {
    short       n_contours;      /* number of contours in glyph        */
    short       n_points;        /* number of points in the glyph      */

    FT_Vector*  points;          /* the outline's points               */
    char*       tags;            /* the points flags                   */
    short*      contours;        /* the contour end points             */

    int         flags;           /* outline masks                      */

  } FT_Outline;

  /* Following limits must be consistent with */
  /* FT_Outline.{n_contours,n_points}         */
#define FT_OUTLINE_CONTOURS_MAX  SHRT_MAX
#define FT_OUTLINE_POINTS_MAX    SHRT_MAX


  /*************************************************************************/
  /*                                                                       */
  /* <Enum>                                                                */
  /*    FT_OUTLINE_FLAGS                                                   */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A list of bit-field constants use for the flags in an outline's    */
  /*    `flags' field.                                                     */
  /*                                                                       */
  /* <Values>                                                              */
  /*    FT_OUTLINE_NONE ::                                                 */
  /*      Value~0 is reserved.                                             */
  /*                                                                       */
  /*    FT_OUTLINE_OWNER ::                                                */
  /*      If set, this flag indicates that the outline's field arrays      */
  /*      (i.e., `points', `flags', and `contours') are `owned' by the     */
  /*      outline object, and should thus be freed when it is destroyed.   */
  /*                                                                       */
  /*    FT_OUTLINE_EVEN_ODD_FILL ::                                        */
  /*      By default, outlines are filled using the non-zero winding rule. */
  /*      If set to 1, the outline will be filled using the even-odd fill  */
  /*      rule (only works with the smooth rasterizer).                    */
  /*                                                                       */
  /*    FT_OUTLINE_REVERSE_FILL ::                                         */
  /*      By default, outside contours of an outline are oriented in       */
  /*      clock-wise direction, as defined in the TrueType specification.  */
  /*      This flag is set if the outline uses the opposite direction      */
  /*      (typically for Type~1 fonts).  This flag is ignored by the scan  */
  /*      converter.                                                       */
  /*                                                                       */
  /*    FT_OUTLINE_IGNORE_DROPOUTS ::                                      */
  /*      By default, the scan converter will try to detect drop-outs in   */
  /*      an outline and correct the glyph bitmap to ensure consistent     */
  /*      shape continuity.  If set, this flag hints the scan-line         */
  /*      converter to ignore such cases.  See below for more information. */
  /*                                                                       */
  /*    FT_OUTLINE_SMART_DROPOUTS ::                                       */
  /*      Select smart dropout control.  If unset, use simple dropout      */
  /*      control.  Ignored if @FT_OUTLINE_IGNORE_DROPOUTS is set.  See    */
  /*      below for more information.                                      */
  /*                                                                       */
  /*    FT_OUTLINE_INCLUDE_STUBS ::                                        */
  /*      If set, turn pixels on for `stubs', otherwise exclude them.      */
  /*      Ignored if @FT_OUTLINE_IGNORE_DROPOUTS is set.  See below for    */
  /*      more information.                                                */
  /*                                                                       */
  /*    FT_OUTLINE_HIGH_PRECISION ::                                       */
  /*      This flag indicates that the scan-line converter should try to   */
  /*      convert this outline to bitmaps with the highest possible        */
  /*      quality.  It is typically set for small character sizes.  Note   */
  /*      that this is only a hint that might be completely ignored by a   */
  /*      given scan-converter.                                            */
  /*                                                                       */
  /*    FT_OUTLINE_SINGLE_PASS ::                                          */
  /*      This flag is set to force a given scan-converter to only use a   */
  /*      single pass over the outline to render a bitmap glyph image.     */
  /*      Normally, it is set for very large character sizes.  It is only  */
  /*      a hint that might be completely ignored by a given               */
  /*      scan-converter.                                                  */
  /*                                                                       */
  /* <Note>                                                                */
  /*    The flags @FT_OUTLINE_IGNORE_DROPOUTS, @FT_OUTLINE_SMART_DROPOUTS, */
  /*    and @FT_OUTLINE_INCLUDE_STUBS are ignored by the smooth            */
  /*    rasterizer.                                                        */
  /*                                                                       */
  /*    There exists a second mechanism to pass the drop-out mode to the   */
  /*    B/W rasterizer; see the `tags' field in @FT_Outline.               */
  /*                                                                       */
  /*    Please refer to the description of the `SCANTYPE' instruction in   */
  /*    the OpenType specification (in file `ttinst1.doc') how simple      */
  /*    drop-outs, smart drop-outs, and stubs are defined.                 */
  /*                                                                       */
#define FT_OUTLINE_NONE             0x0
#define FT_OUTLINE_OWNER            0x1
#define FT_OUTLINE_EVEN_ODD_FILL    0x2
#define FT_OUTLINE_REVERSE_FILL     0x4
#define FT_OUTLINE_IGNORE_DROPOUTS  0x8
#define FT_OUTLINE_SMART_DROPOUTS   0x10
#define FT_OUTLINE_INCLUDE_STUBS    0x20

#define FT_OUTLINE_HIGH_PRECISION   0x100
#define FT_OUTLINE_SINGLE_PASS      0x200


 /*************************************************************************
  *
  * @enum:
  *   ft_outline_flags
  *
  * @description:
  *   These constants are deprecated.  Please use the corresponding
  *   @FT_OUTLINE_FLAGS values.
  *
  * @values:
  *   ft_outline_none            :: See @FT_OUTLINE_NONE.
  *   ft_outline_owner           :: See @FT_OUTLINE_OWNER.
  *   ft_outline_even_odd_fill   :: See @FT_OUTLINE_EVEN_ODD_FILL.
  *   ft_outline_reverse_fill    :: See @FT_OUTLINE_REVERSE_FILL.
  *   ft_outline_ignore_dropouts :: See @FT_OUTLINE_IGNORE_DROPOUTS.
  *   ft_outline_high_precision  :: See @FT_OUTLINE_HIGH_PRECISION.
  *   ft_outline_single_pass     :: See @FT_OUTLINE_SINGLE_PASS.
  */
#define ft_outline_none             FT_OUTLINE_NONE
#define ft_outline_owner            FT_OUTLINE_OWNER
#define ft_outline_even_odd_fill    FT_OUTLINE_EVEN_ODD_FILL
#define ft_outline_reverse_fill     FT_OUTLINE_REVERSE_FILL
#define ft_outline_ignore_dropouts  FT_OUTLINE_IGNORE_DROPOUTS
#define ft_outline_high_precision   FT_OUTLINE_HIGH_PRECISION
#define ft_outline_single_pass      FT_OUTLINE_SINGLE_PASS

  /* */

#define FT_CURVE_TAG( flag )  ( flag & 3 )

#define FT_CURVE_TAG_ON            1
#define FT_CURVE_TAG_CONIC         0
#define FT_CURVE_TAG_CUBIC         2

#define FT_CURVE_TAG_HAS_SCANMODE  4

#define FT_CURVE_TAG_TOUCH_X       8  /* reserved for the TrueType hinter */
#define FT_CURVE_TAG_TOUCH_Y      16  /* reserved for the TrueType hinter */

#define FT_CURVE_TAG_TOUCH_BOTH    ( FT_CURVE_TAG_TOUCH_X | \
                                     FT_CURVE_TAG_TOUCH_Y )

#define FT_Curve_Tag_On       FT_CURVE_TAG_ON
#define FT_Curve_Tag_Conic    FT_CURVE_TAG_CONIC
#define FT_Curve_Tag_Cubic    FT_CURVE_TAG_CUBIC
#define FT_Curve_Tag_Touch_X  FT_CURVE_TAG_TOUCH_X
#define FT_Curve_Tag_Touch_Y  FT_CURVE_TAG_TOUCH_Y


  /*************************************************************************/
  /*                                                                       */
  /* <FuncType>                                                            */
  /*    FT_Outline_MoveToFunc                                              */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A function pointer type used to describe the signature of a `move  */
  /*    to' function during outline walking/decomposition.                 */
  /*                                                                       */
  /*    A `move to' is emitted to start a new contour in an outline.       */
  /*                                                                       */
  /* <Input>                                                               */
  /*    to   :: A pointer to the target point of the `move to'.            */
  /*                                                                       */
  /*    user :: A typeless pointer which is passed from the caller of the  */
  /*            decomposition function.                                    */
  /*                                                                       */
  /* <Return>                                                              */
  /*    Error code.  0~means success.                                      */
  /*                                                                       */
  typedef int
  (*FT_Outline_MoveToFunc)( const FT_Vector*  to,
                            void*             user );

#define FT_Outline_MoveTo_Func  FT_Outline_MoveToFunc


  /*************************************************************************/
  /*                                                                       */
  /* <FuncType>                                                            */
  /*    FT_Outline_LineToFunc                                              */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A function pointer type used to describe the signature of a `line  */
  /*    to' function during outline walking/decomposition.                 */
  /*                                                                       */
  /*    A `line to' is emitted to indicate a segment in the outline.       */
  /*                                                                       */
  /* <Input>                                                               */
  /*    to   :: A pointer to the target point of the `line to'.            */
  /*                                                                       */
  /*    user :: A typeless pointer which is passed from the caller of the  */
  /*            decomposition function.                                    */
  /*                                                                       */
  /* <Return>                                                              */
  /*    Error code.  0~means success.                                      */
  /*                                                                       */
  typedef int
  (*FT_Outline_LineToFunc)( const FT_Vector*  to,
                            void*             user );

#define FT_Outline_LineTo_Func  FT_Outline_LineToFunc


  /*************************************************************************/
  /*                                                                       */
  /* <FuncType>                                                            */
  /*    FT_Outline_ConicToFunc                                             */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A function pointer type used to describe the signature of a `conic */
  /*    to' function during outline walking or decomposition.              */
  /*                                                                       */
  /*    A `conic to' is emitted to indicate a second-order Bézier arc in   */
  /*    the outline.                                                       */
  /*                                                                       */
  /* <Input>                                                               */
  /*    control :: An intermediate control point between the last position */
  /*               and the new target in `to'.                             */
  /*                                                                       */
  /*    to      :: A pointer to the target end point of the conic arc.     */
  /*                                                                       */
  /*    user    :: A typeless pointer which is passed from the caller of   */
  /*               the decomposition function.                             */
  /*                                                                       */
  /* <Return>                                                              */
  /*    Error code.  0~means success.                                      */
  /*                                                                       */
  typedef int
  (*FT_Outline_ConicToFunc)( const FT_Vector*  control,
                             const FT_Vector*  to,
                             void*             user );

#define FT_Outline_ConicTo_Func  FT_Outline_ConicToFunc


  /*************************************************************************/
  /*                                                                       */
  /* <FuncType>                                                            */
  /*    FT_Outline_CubicToFunc                                             */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A function pointer type used to describe the signature of a `cubic */
  /*    to' function during outline walking or decomposition.              */
  /*                                                                       */
  /*    A `cubic to' is emitted to indicate a third-order Bézier arc.      */
  /*                                                                       */
  /* <Input>                                                               */
  /*    control1 :: A pointer to the first Bézier control point.           */
  /*                                                                       */
  /*    control2 :: A pointer to the second Bézier control point.          */
  /*                                                                       */
  /*    to       :: A pointer to the target end point.                     */
  /*                                                                       */
  /*    user     :: A typeless pointer which is passed from the caller of  */
  /*                the decomposition function.                            */
  /*                                                                       */
  /* <Return>                                                              */
  /*    Error code.  0~means success.                                      */
  /*                                                                       */
  typedef int
  (*FT_Outline_CubicToFunc)( const FT_Vector*  control1,
                             const FT_Vector*  control2,
                             const FT_Vector*  to,
                             void*             user );

#define FT_Outline_CubicTo_Func  FT_Outline_CubicToFunc


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    FT_Outline_Funcs                                                   */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A structure to hold various function pointers used during outline  */
  /*    decomposition in order to emit segments, conic, and cubic Béziers. */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    move_to  :: The `move to' emitter.                                 */
  /*                                                                       */
  /*    line_to  :: The segment emitter.                                   */
  /*                                                                       */
  /*    conic_to :: The second-order Bézier arc emitter.                   */
  /*                                                                       */
  /*    cubic_to :: The third-order Bézier arc emitter.                    */
  /*                                                                       */
  /*    shift    :: The shift that is applied to coordinates before they   */
  /*                are sent to the emitter.                               */
  /*                                                                       */
  /*    delta    :: The delta that is applied to coordinates before they   */
  /*                are sent to the emitter, but after the shift.          */
  /*                                                                       */
  /* <Note>                                                                */
  /*    The point coordinates sent to the emitters are the transformed     */
  /*    version of the original coordinates (this is important for high    */
  /*    accuracy during scan-conversion).  The transformation is simple:   */
  /*                                                                       */
  /*    {                                                                  */
  /*      x' = (x << shift) - delta                                        */
  /*      y' = (x << shift) - delta                                        */
  /*    }                                                                  */
  /*                                                                       */
  /*    Set the values of `shift' and `delta' to~0 to get the original     */
  /*    point coordinates.                                                 */
  /*                                                                       */
  typedef struct  FT_Outline_Funcs_
  {
    FT_Outline_MoveToFunc   move_to;
    FT_Outline_LineToFunc   line_to;
    FT_Outline_ConicToFunc  conic_to;
    FT_Outline_CubicToFunc  cubic_to;

    int                     shift;
    FT_Pos                  delta;

  } FT_Outline_Funcs;


  /*************************************************************************/
  /*                                                                       */
  /* <Section>                                                             */
  /*    basic_types                                                        */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Macro>                                                               */
  /*    FT_IMAGE_TAG                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    This macro converts four-letter tags to an unsigned long type.     */
  /*                                                                       */
  /* <Note>                                                                */
  /*    Since many 16-bit compilers don't like 32-bit enumerations, you    */
  /*    should redefine this macro in case of problems to something like   */
  /*    this:                                                              */
  /*                                                                       */
  /*    {                                                                  */
  /*      #define FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 )  value         */
  /*    }                                                                  */
  /*                                                                       */
  /*    to get a simple enumeration without assigning special numbers.     */
  /*                                                                       */
#ifndef FT_IMAGE_TAG
#define FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 )  \
          value = ( ( (unsigned long)_x1 << 24 ) | \
                    ( (unsigned long)_x2 << 16 ) | \
                    ( (unsigned long)_x3 << 8  ) | \
                      (unsigned long)_x4         )
#endif /* FT_IMAGE_TAG */


  /*************************************************************************/
  /*                                                                       */
  /* <Enum>                                                                */
  /*    FT_Glyph_Format                                                    */
  /*                                                                       */
  /* <Description>                                                         */
  /*    An enumeration type used to describe the format of a given glyph   */
  /*    image.  Note that this version of FreeType only supports two image */
  /*    formats, even though future font drivers will be able to register  */
  /*    their own format.                                                  */
  /*                                                                       */
  /* <Values>                                                              */
  /*    FT_GLYPH_FORMAT_NONE ::                                            */
  /*      The value~0 is reserved.                                         */
  /*                                                                       */
  /*    FT_GLYPH_FORMAT_COMPOSITE ::                                       */
  /*      The glyph image is a composite of several other images.  This    */
  /*      format is _only_ used with @FT_LOAD_NO_RECURSE, and is used to   */
  /*      report compound glyphs (like accented characters).               */
  /*                                                                       */
  /*    FT_GLYPH_FORMAT_BITMAP ::                                          */
  /*      The glyph image is a bitmap, and can be described as an          */
  /*      @FT_Bitmap.  You generally need to access the `bitmap' field of  */
  /*      the @FT_GlyphSlotRec structure to read it.                       */
  /*                                                                       */
  /*    FT_GLYPH_FORMAT_OUTLINE ::                                         */
  /*      The glyph image is a vectorial outline made of line segments     */
  /*      and Bézier arcs; it can be described as an @FT_Outline; you      */
  /*      generally want to access the `outline' field of the              */
  /*      @FT_GlyphSlotRec structure to read it.                           */
  /*                                                                       */
  /*    FT_GLYPH_FORMAT_PLOTTER ::                                         */
  /*      The glyph image is a vectorial path with no inside and outside   */
  /*      contours.  Some Type~1 fonts, like those in the Hershey family,  */
  /*      contain glyphs in this format.  These are described as           */
  /*      @FT_Outline, but FreeType isn't currently capable of rendering   */
  /*      them correctly.                                                  */
  /*                                                                       */
  typedef enum  FT_Glyph_Format_
  {
    FT_IMAGE_TAG( FT_GLYPH_FORMAT_NONE, 0, 0, 0, 0 ),

    FT_IMAGE_TAG( FT_GLYPH_FORMAT_COMPOSITE, 'c', 'o', 'm', 'p' ),
    FT_IMAGE_TAG( FT_GLYPH_FORMAT_BITMAP,    'b', 'i', 't', 's' ),
    FT_IMAGE_TAG( FT_GLYPH_FORMAT_OUTLINE,   'o', 'u', 't', 'l' ),
    FT_IMAGE_TAG( FT_GLYPH_FORMAT_PLOTTER,   'p', 'l', 'o', 't' )

  } FT_Glyph_Format;


  /*************************************************************************/
  /*                                                                       */
  /* <Enum>                                                                */
  /*    ft_glyph_format_xxx                                                */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A list of deprecated constants.  Use the corresponding             */
  /*    @FT_Glyph_Format values instead.                                   */
  /*                                                                       */
  /* <Values>                                                              */
  /*    ft_glyph_format_none      :: See @FT_GLYPH_FORMAT_NONE.            */
  /*    ft_glyph_format_composite :: See @FT_GLYPH_FORMAT_COMPOSITE.       */
  /*    ft_glyph_fo…