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ftglyph.h
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上传日期：2020-08-09
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文件大小：35k
源码类别：

其他游戏

开发平台：

Visual C++

ftglyph.h：源码内容
  1. /***************************************************************************/
  2. /*                                                                         */
  3. /*  ftglyph.h                                                              */
  4. /*                                                                         */
  5. /*    FreeType convenience functions to handle glyphs (specification).     */
  6. /*                                                                         */
  7. /*  Copyright 1996-2001, 2002, 2003, 2006 by                               */
  8. /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
  9. /*                                                                         */
  10. /*  This file is part of the FreeType project, and may only be used,       */
  11. /*  modified, and distributed under the terms of the FreeType project      */
  12. /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  13. /*  this file you indicate that you have read the license and              */
  14. /*  understand and accept it fully.                                        */
  15. /*                                                                         */
  16. /***************************************************************************/
  19.   /*************************************************************************/
  20.   /*                                                                       */
  21.   /* This file contains the definition of several convenience functions    */
  22.   /* that can be used by client applications to easily retrieve glyph      */
  23.   /* bitmaps and outlines from a given face.                               */
  24.   /*                                                                       */
  25.   /* These functions should be optional if you are writing a font server   */
  26.   /* or text layout engine on top of FreeType.  However, they are pretty   */
  27.   /* handy for many other simple uses of the library.                      */
  28.   /*                                                                       */
  29.   /*************************************************************************/
  32. #ifndef __FTGLYPH_H__
  33. #define __FTGLYPH_H__
  36. #include <ft2build.h>
  37. #include FT_FREETYPE_H
  39. #ifdef FREETYPE_H
  40. #error "freetype.h of FreeType 1 has been loaded!"
  41. #error "Please fix the directory search order for header files"
  42. #error "so that freetype.h of FreeType 2 is found first."
  43. #endif
  46. FT_BEGIN_HEADER
  49.   /*************************************************************************/
  50.   /*                                                                       */
  51.   /* <Section>                                                             */
  52.   /*    glyph_management                                                   */
  53.   /*                                                                       */
  54.   /* <Title>                                                               */
  55.   /*    Glyph Management                                                   */
  56.   /*                                                                       */
  57.   /* <Abstract>                                                            */
  58.   /*    Generic interface to manage individual glyph data.                 */
  59.   /*                                                                       */
  60.   /* <Description>                                                         */
  61.   /*    This section contains definitions used to manage glyph data        */
  62.   /*    through generic FT_Glyph objects.  Each of them can contain a      */
  63.   /*    bitmap, a vector outline, or even images in other formats.         */
  64.   /*                                                                       */
  65.   /*************************************************************************/
  68.   /* forward declaration to a private type */
  69.   typedef struct FT_Glyph_Class_  FT_Glyph_Class;
  72.   /*************************************************************************/
  73.   /*                                                                       */
  74.   /* <Type>                                                                */
  75.   /*    FT_Glyph                                                           */
  76.   /*                                                                       */
  77.   /* <Description>                                                         */
  78.   /*    Handle to an object used to model generic glyph images.  It is a   */
  79.   /*    pointer to the @FT_GlyphRec structure and can contain a glyph      */
  80.   /*    bitmap or pointer.                                                 */
  81.   /*                                                                       */
  82.   /* <Note>                                                                */
  83.   /*    Glyph objects are not owned by the library.  You must thus release */
  84.   /*    them manually (through @FT_Done_Glyph) _before_ calling            */
  85.   /*    @FT_Done_FreeType.                                                 */
  86.   /*                                                                       */
  87.   typedef struct FT_GlyphRec_*  FT_Glyph;
  90.   /*************************************************************************/
  91.   /*                                                                       */
  92.   /* <Struct>                                                              */
  93.   /*    FT_GlyphRec                                                        */
  94.   /*                                                                       */
  95.   /* <Description>                                                         */
  96.   /*    The root glyph structure contains a given glyph image plus its     */
  97.   /*    advance width in 16.16 fixed float format.                         */
  98.   /*                                                                       */
  99.   /* <Fields>                                                              */
  100.   /*    library :: A handle to the FreeType library object.                */
  101.   /*                                                                       */
  102.   /*    clazz   :: A pointer to the glyph's class.  Private.               */
  103.   /*                                                                       */
  104.   /*    format  :: The format of the glyph's image.                        */
  105.   /*                                                                       */
  106.   /*    advance :: A 16.16 vector that gives the glyph's advance width.    */
  107.   /*                                                                       */
  108.   typedef struct  FT_GlyphRec_
  109.   {
  110.     FT_Library             library;
  111.     const FT_Glyph_Class*  clazz;
  112.     FT_Glyph_Format        format;
  113.     FT_Vector              advance;
  115.   } FT_GlyphRec;
  118.   /*************************************************************************/
  119.   /*                                                                       */
  120.   /* <Type>                                                                */
  121.   /*    FT_BitmapGlyph                                                     */
  122.   /*                                                                       */
  123.   /* <Description>                                                         */
  124.   /*    A handle to an object used to model a bitmap glyph image.  This is */
  125.   /*    a sub-class of @FT_Glyph, and a pointer to @FT_BitmapGlyphRec.     */
  126.   /*                                                                       */
  127.   typedef struct FT_BitmapGlyphRec_*  FT_BitmapGlyph;
  130.   /*************************************************************************/
  131.   /*                                                                       */
  132.   /* <Struct>                                                              */
  133.   /*    FT_BitmapGlyphRec                                                  */
  134.   /*                                                                       */
  135.   /* <Description>                                                         */
  136.   /*    A structure used for bitmap glyph images.  This really is a        */
  137.   /*    `sub-class' of @FT_GlyphRec.                                       */
  138.   /*                                                                       */
  139.   /* <Fields>                                                              */
  140.   /*    root   :: The root @FT_Glyph fields.                               */
  141.   /*                                                                       */
  142.   /*    left   :: The left-side bearing, i.e., the horizontal distance     */
  143.   /*              from the current pen position to the left border of the  */
  144.   /*              glyph bitmap.                                            */
  145.   /*                                                                       */
  146.   /*    top    :: The top-side bearing, i.e., the vertical distance from   */
  147.   /*              the current pen position to the top border of the glyph  */
  148.   /*              bitmap.  This distance is positive for upwards-y!        */
  149.   /*                                                                       */
  150.   /*    bitmap :: A descriptor for the bitmap.                             */
  151.   /*                                                                       */
  152.   /* <Note>                                                                */
  153.   /*    You can typecast an @FT_Glyph to @FT_BitmapGlyph if you have       */
  154.   /*    `glyph->format == FT_GLYPH_FORMAT_BITMAP'.  This lets you access   */
  155.   /*    the bitmap's contents easily.                                      */
  156.   /*                                                                       */
  157.   /*    The corresponding pixel buffer is always owned by @FT_BitmapGlyph  */
  158.   /*    and is thus created and destroyed with it.                         */
  159.   /*                                                                       */
  160.   typedef struct  FT_BitmapGlyphRec_
  161.   {
  162.     FT_GlyphRec  root;
  163.     FT_Int       left;
  164.     FT_Int       top;
  165.     FT_Bitmap    bitmap;
  167.   } FT_BitmapGlyphRec;
  170.   /*************************************************************************/
  171.   /*                                                                       */
  172.   /* <Type>                                                                */
  173.   /*    FT_OutlineGlyph                                                    */
  174.   /*                                                                       */
  175.   /* <Description>                                                         */
  176.   /*    A handle to an object used to model an outline glyph image.  This  */
  177.   /*    is a sub-class of @FT_Glyph, and a pointer to @FT_OutlineGlyphRec. */
  178.   /*                                                                       */
  179.   typedef struct FT_OutlineGlyphRec_*  FT_OutlineGlyph;
  182.   /*************************************************************************/
  183.   /*                                                                       */
  184.   /* <Struct>                                                              */
  185.   /*    FT_OutlineGlyphRec                                                 */
  186.   /*                                                                       */
  187.   /* <Description>                                                         */
  188.   /*    A structure used for outline (vectorial) glyph images.  This       */
  189.   /*    really is a `sub-class' of @FT_GlyphRec.                           */
  190.   /*                                                                       */
  191.   /* <Fields>                                                              */
  192.   /*    root    :: The root @FT_Glyph fields.                              */
  193.   /*                                                                       */
  194.   /*    outline :: A descriptor for the outline.                           */
  195.   /*                                                                       */
  196.   /* <Note>                                                                */
  197.   /*    You can typecast a @FT_Glyph to @FT_OutlineGlyph if you have       */
  198.   /*    `glyph->format == FT_GLYPH_FORMAT_OUTLINE'.  This lets you access  */
  199.   /*    the outline's content easily.                                      */
  200.   /*                                                                       */
  201.   /*    As the outline is extracted from a glyph slot, its coordinates are */
  202.   /*    expressed normally in 26.6 pixels, unless the flag                 */
  203.   /*    @FT_LOAD_NO_SCALE was used in @FT_Load_Glyph() or @FT_Load_Char(). */
  204.   /*                                                                       */
  205.   /*    The outline's tables are always owned by the object and are        */
  206.   /*    destroyed with it.                                                 */
  207.   /*                                                                       */
  208.   typedef struct  FT_OutlineGlyphRec_
  209.   {
  210.     FT_GlyphRec  root;
  211.     FT_Outline   outline;
  213.   } FT_OutlineGlyphRec;
  216.   /*************************************************************************/
  217.   /*                                                                       */
  218.   /* <Function>                                                            */
  219.   /*    FT_Get_Glyph                                                       */
  220.   /*                                                                       */
  221.   /* <Description>                                                         */
  222.   /*    A function used to extract a glyph image from a slot.              */
  223.   /*                                                                       */
  224.   /* <Input>                                                               */
  225.   /*    slot   :: A handle to the source glyph slot.                       */
  226.   /*                                                                       */
  227.   /* <Output>                                                              */
  228.   /*    aglyph :: A handle to the glyph object.                            */
  229.   /*                                                                       */
  230.   /* <Return>                                                              */
  231.   /*    FreeType error code.  0 means success.                             */
  232.   /*                                                                       */
  233.   FT_EXPORT( FT_Error )
  234.   FT_Get_Glyph( FT_GlyphSlot  slot,
  235.                 FT_Glyph     *aglyph );
  238.   /*************************************************************************/
  239.   /*                                                                       */
  240.   /* <Function>                                                            */
  241.   /*    FT_Glyph_Copy                                                      */
  242.   /*                                                                       */
  243.   /* <Description>                                                         */
  244.   /*    A function used to copy a glyph image.  Note that the created      */
  245.   /*    @FT_Glyph object must be released with @FT_Done_Glyph.             */
  246.   /*                                                                       */
  247.   /* <Input>                                                               */
  248.   /*    source :: A handle to the source glyph object.                     */
  249.   /*                                                                       */
  250.   /* <Output>                                                              */
  251.   /*    target :: A handle to the target glyph object.  0 in case of       */
  252.   /*              error.                                                   */
  253.   /*                                                                       */
  254.   /* <Return>                                                              */
  255.   /*    FreeType error code.  0 means success.                             */
  256.   /*                                                                       */
  257.   FT_EXPORT( FT_Error )
  258.   FT_Glyph_Copy( FT_Glyph   source,
  259.                  FT_Glyph  *target );
  262.   /*************************************************************************/
  263.   /*                                                                       */
  264.   /* <Function>                                                            */
  265.   /*    FT_Glyph_Transform                                                 */
  266.   /*                                                                       */
  267.   /* <Description>                                                         */
  268.   /*    Transforms a glyph image if its format is scalable.                */
  269.   /*                                                                       */
  270.   /* <InOut>                                                               */
  271.   /*    glyph  :: A handle to the target glyph object.                     */
  272.   /*                                                                       */
  273.   /* <Input>                                                               */
  274.   /*    matrix :: A pointer to a 2x2 matrix to apply.                      */
  275.   /*                                                                       */
  276.   /*    delta  :: A pointer to a 2d vector to apply.  Coordinates are      */
  277.   /*              expressed in 1/64th of a pixel.                          */
  278.   /*                                                                       */
  279.   /* <Return>                                                              */
  280.   /*    FreeType error code (if not 0, the glyph format is not scalable).  */
  281.   /*                                                                       */
  282.   /* <Note>                                                                */
  283.   /*    The 2x2 transformation matrix is also applied to the glyph's       */
  284.   /*    advance vector.                                                    */
  285.   /*                                                                       */
  286.   FT_EXPORT( FT_Error )
  287.   FT_Glyph_Transform( FT_Glyph    glyph,
  288.                       FT_Matrix*  matrix,
  289.                       FT_Vector*  delta );
  292.   /*************************************************************************/
  293.   /*                                                                       */
  294.   /* <Enum>                                                                */
  295.   /*    FT_Glyph_BBox_Mode                                                 */
  296.   /*                                                                       */
  297.   /* <Description>                                                         */
  298.   /*    The mode how the values of @FT_Glyph_Get_CBox are returned.        */
  299.   /*                                                                       */
  300.   /* <Values>                                                              */
  301.   /*    FT_GLYPH_BBOX_UNSCALED ::                                          */
  302.   /*      Return unscaled font units.                                      */
  303.   /*                                                                       */
  304.   /*    FT_GLYPH_BBOX_SUBPIXELS ::                                         */
  305.   /*      Return unfitted 26.6 coordinates.                                */
  306.   /*                                                                       */
  307.   /*    FT_GLYPH_BBOX_GRIDFIT ::                                           */
  308.   /*      Return grid-fitted 26.6 coordinates.                             */
  309.   /*                                                                       */
  310.   /*    FT_GLYPH_BBOX_TRUNCATE ::                                          */
  311.   /*      Return coordinates in integer pixels.                            */
  312.   /*                                                                       */
  313.   /*    FT_GLYPH_BBOX_PIXELS ::                                            */
  314.   /*      Return grid-fitted pixel coordinates.                            */
  315.   /*                                                                       */
  316.   typedef enum  FT_Glyph_BBox_Mode_
  317.   {
  318.     FT_GLYPH_BBOX_UNSCALED  = 0,
  319.     FT_GLYPH_BBOX_SUBPIXELS = 0,
  320.     FT_GLYPH_BBOX_GRIDFIT   = 1,
  321.     FT_GLYPH_BBOX_TRUNCATE  = 2,
  322.     FT_GLYPH_BBOX_PIXELS    = 3
  324.   } FT_Glyph_BBox_Mode;
  327.   /*************************************************************************/
  328.   /*                                                                       */
  329.   /* <Enum>                                                                */
  330.   /*    ft_glyph_bbox_xxx                                                  */
  331.   /*                                                                       */
  332.   /* <Description>                                                         */
  333.   /*    These constants are deprecated.  Use the corresponding             */
  334.   /*    @FT_Glyph_BBox_Mode values instead.                                */
  335.   /*                                                                       */
  336.   /* <Values>                                                              */
  337.   /*   ft_glyph_bbox_unscaled  :: See @FT_GLYPH_BBOX_UNSCALED.             */
  338.   /*   ft_glyph_bbox_subpixels :: See @FT_GLYPH_BBOX_SUBPIXELS.            */
  339.   /*   ft_glyph_bbox_gridfit   :: See @FT_GLYPH_BBOX_GRIDFIT.              */
  340.   /*   ft_glyph_bbox_truncate  :: See @FT_GLYPH_BBOX_TRUNCATE.             */
  341.   /*   ft_glyph_bbox_pixels    :: See @FT_GLYPH_BBOX_PIXELS.               */
  342.   /*                                                                       */
  343. #define ft_glyph_bbox_unscaled   FT_GLYPH_BBOX_UNSCALED
  344. #define ft_glyph_bbox_subpixels  FT_GLYPH_BBOX_SUBPIXELS
  345. #define ft_glyph_bbox_gridfit    FT_GLYPH_BBOX_GRIDFIT
  346. #define ft_glyph_bbox_truncate   FT_GLYPH_BBOX_TRUNCATE
  347. #define ft_glyph_bbox_pixels     FT_GLYPH_BBOX_PIXELS
  350.   /*************************************************************************/
  351.   /*                                                                       */
  352.   /* <Function>                                                            */
  353.   /*    FT_Glyph_Get_CBox                                                  */
  354.   /*                                                                       */
  355.   /* <Description>                                                         */
  356.   /*    Return a glyph's `control box'.  The control box encloses all the  */
  357.   /*    outline's points, including Bézier control points.  Though it      */
  358.   /*    coincides with the exact bounding box for most glyphs, it can be   */
  359.   /*    slightly larger in some situations (like when rotating an outline  */
  360.   /*    which contains Bézier outside arcs).                               */
  361.   /*                                                                       */
  362.   /*    Computing the control box is very fast, while getting the bounding */
  363.   /*    box can take much more time as it needs to walk over all segments  */
  364.   /*    and arcs in the outline.  To get the latter, you can use the       */
  365.   /*    `ftbbox' component which is dedicated to this single task.         */
  366.   /*                                                                       */
  367.   /* <Input>                                                               */
  368.   /*    glyph :: A handle to the source glyph object.                      */
  369.   /*                                                                       */
  370.   /*    mode  :: The mode which indicates how to interpret the returned    */
  371.   /*             bounding box values.                                      */
  372.   /*                                                                       */
  373.   /* <Output>                                                              */
  374.   /*    acbox :: The glyph coordinate bounding box.  Coordinates are       */
  375.   /*             expressed in 1/64th of pixels if it is grid-fitted.       */
  376.   /*                                                                       */
  377.   /* <Note>                                                                */
  378.   /*    Coordinates are relative to the glyph origin, using the Y-upwards  */
  379.   /*    convention.                                                        */
  380.   /*                                                                       */
  381.   /*    If the glyph has been loaded with @FT_LOAD_NO_SCALE, `bbox_mode'   */
  382.   /*    must be set to @FT_GLYPH_BBOX_UNSCALED to get unscaled font        */
  383.   /*    units in 26.6 pixel format.  The value @FT_GLYPH_BBOX_SUBPIXELS    */
  384.   /*    is another name for this constant.                                 */
  385.   /*                                                                       */
  386.   /*    Note that the maximum coordinates are exclusive, which means that  */
  387.   /*    one can compute the width and height of the glyph image (be it in  */
  388.   /*    integer or 26.6 pixels) as:                                        */
  389.   /*                                                                       */
  390.   /*    {                                                                  */
  391.   /*      width  = bbox.xMax - bbox.xMin;                                  */
  392.   /*      height = bbox.yMax - bbox.yMin;                                  */
  393.   /*    }                                                                  */
  394.   /*                                                                       */
  395.   /*    Note also that for 26.6 coordinates, if `bbox_mode' is set to      */
  396.   /*    @FT_GLYPH_BBOX_GRIDFIT, the coordinates will also be grid-fitted,  */
  397.   /*    which corresponds to:                                              */
  398.   /*                                                                       */
  399.   /*    {                                                                  */
  400.   /*      bbox.xMin = FLOOR(bbox.xMin);                                    */
  401.   /*      bbox.yMin = FLOOR(bbox.yMin);                                    */
  402.   /*      bbox.xMax = CEILING(bbox.xMax);                                  */
  403.   /*      bbox.yMax = CEILING(bbox.yMax);                                  */
  404.   /*    }                                                                  */
  405.   /*                                                                       */
  406.   /*    To get the bbox in pixel coordinates, set `bbox_mode' to           */
  407.   /*    @FT_GLYPH_BBOX_TRUNCATE.                                           */
  408.   /*                                                                       */
  409.   /*    To get the bbox in grid-fitted pixel coordinates, set `bbox_mode'  */
  410.   /*    to @FT_GLYPH_BBOX_PIXELS.                                          */
  411.   /*                                                                       */
  412.   FT_EXPORT( void )
  413.   FT_Glyph_Get_CBox( FT_Glyph  glyph,
  414.                      FT_UInt   bbox_mode,
  415.                      FT_BBox  *acbox );
  418.   /*************************************************************************/
  419.   /*                                                                       */
  420.   /* <Function>                                                            */
  421.   /*    FT_Glyph_To_Bitmap                                                 */
  422.   /*                                                                       */
  423.   /* <Description>                                                         */
  424.   /*    Converts a given glyph object to a bitmap glyph object.            */
  425.   /*                                                                       */
  426.   /* <InOut>                                                               */
  427.   /*    the_glyph   :: A pointer to a handle to the target glyph.          */
  428.   /*                                                                       */
  429.   /* <Input>                                                               */
  430.   /*    render_mode :: An enumeration that describe how the data is        */
  431.   /*                   rendered.                                           */
  432.   /*                                                                       */
  433.   /*    origin      :: A pointer to a vector used to translate the glyph   */
  434.   /*                   image before rendering.  Can be 0 (if no            */
  435.   /*                   translation).  The origin is expressed in           */
  436.   /*                   26.6 pixels.                                        */
  437.   /*                                                                       */
  438.   /*    destroy     :: A boolean that indicates that the original glyph    */
  439.   /*                   image should be destroyed by this function.  It is  */
  440.   /*                   never destroyed in case of error.                   */
  441.   /*                                                                       */
  442.   /* <Return>                                                              */
  443.   /*    FreeType error code.  0 means success.                             */
  444.   /*                                                                       */
  445.   /* <Note>                                                                */
  446.   /*    The glyph image is translated with the `origin' vector before      */
  447.   /*    rendering.                                                         */
  448.   /*                                                                       */
  449.   /*    The first parameter is a pointer to an @FT_Glyph handle, that will */
  450.   /*    be replaced by this function.  Typically, you would use (omitting  */
  451.   /*    error handling):                                                   */
  452.   /*                                                                       */
  453.   /*                                                                       */
  454.   /*      {                                                                */
  455.   /*        FT_Glyph        glyph;                                         */
  456.   /*        FT_BitmapGlyph  glyph_bitmap;                                  */
  457.   /*                                                                       */
  458.   /*                                                                       */
  459.   /*        // load glyph                                                  */
  460.   /*        error = FT_Load_Char( face, glyph_index, FT_LOAD_DEFAUT );     */
  461.   /*                                                                       */
  462.   /*        // extract glyph image                                         */
  463.   /*        error = FT_Get_Glyph( face->glyph, &glyph );                   */
  464.   /*                                                                       */
  465.   /*        // convert to a bitmap (default render mode + destroy old)     */
  466.   /*        if ( glyph->format != FT_GLYPH_FORMAT_BITMAP )                 */
  467.   /*        {                                                              */
  468.   /*          error = FT_Glyph_To_Bitmap( &glyph, FT_RENDER_MODE_DEFAULT,  */
  469.   /*                                      0, 1 );                          */
  470.   /*          if ( error ) // glyph unchanged                              */
  471.   /*            ...                                                        */
  472.   /*        }                                                              */
  473.   /*                                                                       */
  474.   /*        // access bitmap content by typecasting                        */
  475.   /*        glyph_bitmap = (FT_BitmapGlyph)glyph;                          */
  476.   /*                                                                       */
  477.   /*        // do funny stuff with it, like blitting/drawing               */
  478.   /*        ...                                                            */
  479.   /*                                                                       */
  480.   /*        // discard glyph image (bitmap or not)                         */
  481.   /*        FT_Done_Glyph( glyph );                                        */
  482.   /*      }                                                                */
  483.   /*                                                                       */
  484.   /*                                                                       */
  485.   /*    This function does nothing if the glyph format isn't scalable.     */
  486.   /*                                                                       */
  487.   FT_EXPORT( FT_Error )
  488.   FT_Glyph_To_Bitmap( FT_Glyph*       the_glyph,
  489.                       FT_Render_Mode  render_mode,
  490.                       FT_Vector*      origin,
  491.                       FT_Bool         destroy );
  494.   /*************************************************************************/
  495.   /*                                                                       */
  496.   /* <Function>                                                            */
  497.   /*    FT_Done_Glyph                                                      */
  498.   /*                                                                       */
  499.   /* <Description>                                                         */
  500.   /*    Destroys a given glyph.                                            */
  501.   /*                                                                       */
  502.   /* <Input>                                                               */
  503.   /*    glyph :: A handle to the target glyph object.                      */
  504.   /*                                                                       */
  505.   FT_EXPORT( void )
  506.   FT_Done_Glyph( FT_Glyph  glyph );
  508.   /* */
  511.   /* other helpful functions */
  513.   /*************************************************************************/
  514.   /*                                                                       */
  515.   /* <Section>                                                             */
  516.   /*    computations                                                       */
  517.   /*                                                                       */
  518.   /*************************************************************************/
  521.   /*************************************************************************/
  522.   /*                                                                       */
  523.   /* <Function>                                                            */
  524.   /*    FT_Matrix_Multiply                                                 */
  525.   /*                                                                       */
  526.   /* <Description>                                                         */
  527.   /*    Performs the matrix operation `b = a*b'.                           */
  528.   /*                                                                       */
  529.   /* <Input>                                                               */
  530.   /*    a :: A pointer to matrix `a'.                                      */
  531.   /*                                                                       */
  532.   /* <InOut>                                                               */
  533.   /*    b :: A pointer to matrix `b'.                                      */
  534.   /*                                                                       */
  535.   /* <Note>                                                                */
  536.   /*    The result is undefined if either `a' or `b' is zero.              */
  537.   /*                                                                       */
  538.   FT_EXPORT( void )
  539.   FT_Matrix_Multiply( const FT_Matrix*  a,
  540.                       FT_Matrix*  b );
  543.   /*************************************************************************/
  544.   /*                                                                       */
  545.   /* <Function>                                                            */
  546.   /*    FT_Matrix_Invert                                                   */
  547.   /*                                                                       */
  548.   /* <Description>                                                         */
  549.   /*    Inverts a 2x2 matrix.  Returns an error if it can't be inverted.   */
  550.   /*                                                                       */
  551.   /* <InOut>                                                               */
  552.   /*    matrix :: A pointer to the target matrix.  Remains untouched in    */
  553.   /*              case of error.                                           */
  554.   /*                                                                       */
  555.   /* <Return>                                                              */
  556.   /*    FreeType error code.  0 means success.                             */
  557.   /*                                                                       */
  558.   FT_EXPORT( FT_Error )
  559.   FT_Matrix_Invert( FT_Matrix*  matrix );
  562.   /* */
  565. FT_END_HEADER
  567. #endif /* __FTGLYPH_H__ */
  570. /* END */
  573. /* Local Variables: */
  574. /* coding: utf-8    */
  575. /* End:             */