ftoutln.h

一个Xpdf应用的例子

/***************************************************************************/
/*                                                                         */
/*  ftoutln.h                                                              */
/*                                                                         */
/*    Support for the FT_Outline type used to store glyph shapes of        */
/*    most scalable font formats (specification).                          */
/*                                                                         */
/*  Copyright 1996-2001 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.                                        */
/*                                                                         */
/***************************************************************************/


#ifndef __FTOUTLN_H__
#define __FTOUTLN_H__


#include <ft2build.h>
#include FT_FREETYPE_H


FT_BEGIN_HEADER


  /*************************************************************************/
  /*                                                                       */
  /* <Section>                                                             */
  /*    outline_processing                                                 */
  /*                                                                       */
  /* <Title>                                                               */
  /*    Outline Processing                                                 */
  /*                                                                       */
  /* <Abstract>                                                            */
  /*    Functions to create, transform, and render vectorial glyph images. */
  /*                                                                       */
  /* <Description>                                                         */
  /*    This section contains routines used to create and destroy scalable */
  /*    glyph images known as `outlines'.  These can also be measured,     */
  /*    transformed, and converted into bitmaps and pixmaps.               */
  /*                                                                       */
  /* <Order>                                                               */
  /*    FT_Outline                                                         */
  /*    FT_Outline_Flags                                                   */
  /*    FT_Outline_New                                                     */
  /*    FT_Outline_Done                                                    */
  /*    FT_Outline_Copy                                                    */
  /*    FT_Outline_Translate                                               */
  /*    FT_Outline_Transform                                               */
  /*    FT_Outline_Reverse                                                 */
  /*    FT_Outline_Check                                                   */
  /*                                                                       */
  /*    FT_Outline_Get_CBox                                                */
  /*    FT_Outline_Get_BBox                                                */
  /*                                                                       */
  /*    FT_Outline_Get_Bitmap                                              */
  /*    FT_Outline_Render                                                  */
  /*                                                                       */
  /*    FT_Outline_Decompose                                               */
  /*    FT_Outline_Funcs                                                   */
  /*    FT_Outline_MoveTo_Func                                             */
  /*    FT_Outline_LineTo_Func                                             */
  /*    FT_Outline_ConicTo_Func                                            */
  /*    FT_Outline_CubicTo_Func                                            */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Outline_Decompose                                               */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Walks over an outline's structure to decompose it into individual  */
  /*    segments and Bezier arcs.  This function is also able to emit      */
  /*    `move to' and `close to' operations to indicate the start and end  */
  /*    of new contours in the outline.                                    */
  /*                                                                       */
  /* <Input>                                                               */
  /*    outline   :: A pointer to the source target.                       */
  /*                                                                       */
  /*    interface :: A table of `emitters', i.e,. function pointers called */
  /*                 during decomposition to indicate path operations.     */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    user      :: A typeless pointer which is passed to each emitter    */
  /*                 during the decomposition.  It can be used to store    */
  /*                 the state during the decomposition.                   */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means sucess.                              */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Outline_Decompose( FT_Outline*              outline,
                        const FT_Outline_Funcs*  interface,
                        void*                    user );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Outline_New                                                     */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Creates a new outline of a given size.                             */
  /*                                                                       */
  /* <Input>                                                               */
  /*    library     :: A handle to the library object from where the       */
  /*                   outline is allocated.  Note however that the new    */
  /*                   outline will NOT necessarily be FREED, when         */
  /*                   destroying the library, by FT_Done_FreeType().      */
  /*                                                                       */
  /*    numPoints   :: The maximal number of points within the outline.    */
  /*                                                                       */
  /*    numContours :: The maximal number of contours within the outline.  */
  /*                                                                       */
  /* <Output>                                                              */
  /*    anoutline   :: A handle to the new outline.  NULL in case of       */
  /*                   error.                                              */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  /* <Note>                                                                */
  /*    The reason why this function takes a `library' parameter is simply */
  /*    to use the library's memory allocator.                             */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Outline_New( FT_Library   library,
                  FT_UInt      numPoints,
                  FT_Int       numContours,
                  FT_Outline  *anoutline );


  FT_EXPORT( FT_Error )
  FT_Outline_New_Internal( FT_Memory    memory,
                           FT_UInt      numPoints,
                           FT_Int       numContours,
                           FT_Outline  *anoutline );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Outline_Done                                                    */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Destroys an outline created with FT_Outline_New().                 */
  /*                                                                       */
  /* <Input>                                                               */
  /*    library :: A handle of the library object used to allocate the     */
  /*               outline.                                                */
  /*                                                                       */
  /*    outline :: A pointer to the outline object to be discarded.        */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  /* <Note>                                                                */
  /*    If the outline's `owner' field is not set, only the outline        */
  /*    descriptor will be released.                                       */
  /*                                                                       */
  /*    The reason why this function takes an `library' parameter is       */
  /*    simply to use FT_Free().                                           */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Outline_Done( FT_Library   library,
                   FT_Outline*  outline );


  FT_EXPORT( FT_Error )
  FT_Outline_Done_Internal( FT_Memory    memory,
                            FT_Outline*  outline );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Outline_Check                                                   */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Check the contents of an outline descriptor.                       */
  /*                                                                       */
  /* <Input>                                                               */
  /*    outline :: A handle to a source outline.                           */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Outline_Check( FT_Outline*  outline );


  /*************************************************************************/