pshints.h

这是osg的第三方插件库

/***************************************************************************/
/*                                                                         */
/*  pshints.h                                                              */
/*                                                                         */
/*    Interface to Postscript-specific (Type 1 and Type 2) hints           */
/*    recorders (specification only).  These are used to support native    */
/*    T1/T2 hints in the "type1", "cid" and "cff" font drivers.            */
/*                                                                         */
/*  Copyright 2001, 2002, 2003 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 __PSHINTS_H__
#define __PSHINTS_H__


#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_TYPE1_TABLES_H


FT_BEGIN_HEADER


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****               INTERNAL REPRESENTATION OF GLOBALS              *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  typedef struct PSH_GlobalsRec_*  PSH_Globals;

  typedef FT_Error
  (*PSH_Globals_NewFunc)( FT_Memory     memory,
                          T1_Private*   private_dict,
                          PSH_Globals*  aglobals );

  typedef FT_Error
  (*PSH_Globals_SetScaleFunc)( PSH_Globals  globals,
                               FT_Fixed     x_scale,
                               FT_Fixed     y_scale,
                               FT_Fixed     x_delta,
                               FT_Fixed     y_delta );

  typedef void
  (*PSH_Globals_DestroyFunc)( PSH_Globals  globals );


  typedef struct  PSH_Globals_FuncsRec_
  {
    PSH_Globals_NewFunc       create;
    PSH_Globals_SetScaleFunc  set_scale;
    PSH_Globals_DestroyFunc   destroy;

  } PSH_Globals_FuncsRec, *PSH_Globals_Funcs;


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                  PUBLIC TYPE 1 HINTS RECORDER                 *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  /*************************************************************************/
  /*                                                                       */
  /* @type:                                                                */
  /*    T1_Hints                                                           */
  /*                                                                       */
  /* @description:                                                         */
  /*    This is a handle to an opaque structure used to record glyph hints */
  /*    from a Type 1 character glyph character string.                    */
  /*                                                                       */
  /*    The methods used to operate on this object are defined by the      */
  /*    @T1_Hints_FuncsRec structure.  Recording glyph hints is normally   */
  /*    achieved through the following scheme:                             */
  /*                                                                       */
  /*    - Open a new hint recording session by calling the "open" method.  */
  /*      This will rewind the recorder and prepare it for new input.      */
  /*                                                                       */
  /*    - For each hint found in the glyph charstring, call the            */
  /*      corresponding method ("stem", "stem3", or "reset").  Note that   */
  /*      these functions do not return an error code.                     */
  /*                                                                       */
  /*    - Close the recording session by calling the "close" method.  It   */
  /*      will return an error code if the hints were invalid or something */
  /*      strange happened (e.g. memory shortage).                         */
  /*                                                                       */
  /*    The hints accumulated in the object can later be used by the       */
  /*    PostScript hinter.                                                 */
  /*                                                                       */
  typedef struct T1_HintsRec_*  T1_Hints;


  /*************************************************************************/
  /*                                                                       */
  /* @type:                                                                */
  /*    T1_Hints_Funcs                                                     */
  /*                                                                       */
  /* @description:                                                         */
  /*    A pointer to the @T1_Hints_FuncsRec structure that defines the     */
  /*    API of a given @T1_Hints object.                                   */
  /*                                                                       */
  typedef const struct T1_Hints_FuncsRec_*  T1_Hints_Funcs;


  /*************************************************************************/
  /*                                                                       */
  /* @functype:                                                            */
  /*    T1_Hints_OpenFunc                                                  */
  /*                                                                       */
  /* @description:                                                         */
  /*    A method of the @T1_Hints class used to prepare it for a new       */
  /*    Type 1 hints recording session.                                    */
  /*                                                                       */
  /* @input:                                                               */
  /*    hints :: A handle to the Type 1 hints recorder.                    */
  /*                                                                       */
  /* @note:                                                                */
  /*    You should always call the @T1_Hints_CloseFunc method in order to  */
  /*    close an opened recording session.                                 */
  /*                                                                       */
  typedef void
  (*T1_Hints_OpenFunc)( T1_Hints  hints );


  /*************************************************************************/
  /*                                                                       */
  /* @functype:                                                            */
  /*    T1_Hints_SetStemFunc                                               */
  /*                                                                       */
  /* @description:                                                         */
  /*    A method of the @T1_Hints class used to record a new horizontal or */
  /*    vertical stem.  This corresponds to the Type 1 "hstem" and "vstem" */
  /*    operators.                                                         */
  /*                                                                       */
  /* @input:                                                               */
  /*    hints     :: A handle to the Type 1 hints recorder.                */
  /*                                                                       */
  /*    dimension :: 0 for horizontal stems (hstem), 1 for vertical ones   */
  /*                 (vstem).                                              */
  /*                                                                       */
  /*    coords    :: Array of 2 integers, used as (position,length) stem   */
  /*                 descriptor.                                           */
  /*                                                                       */
  /* @note:                                                                */
  /*    Use vertical coordinates (y) for horizontal stems (dim=0).  Use    */
  /*    horizontal coordinates (x) for vertical stems (dim=1).             */
  /*                                                                       */
  /*    "coords[0]" is the absolute stem position (lowest coordinate);     */
  /*    "coords[1]" is the length.                                         */
  /*                                                                       */
  /*    The length can be negative, in which case it must be either -20 or */
  /*    -21.  It will be interpreted as a "ghost" stem, according to       */
  /*    Type 1 specification.                                              */
  /*                                                                       */
  /*    If the length is -21 (corresponding to a bottom ghost stem), then  */
  /*    the real stem position is "coords[0]+coords[1]".                   */
  /*                                                                       */
  typedef void
  (*T1_Hints_SetStemFunc)( T1_Hints  hints,
                           FT_UInt   dimension,
                           FT_Long*  coords );


  /*************************************************************************/
  /*                                                                       */
  /* @functype:                                                            */
  /*    T1_Hints_SetStem3Func                                              */
  /*                                                                       */
  /* @description:                                                         */
  /*    A method of the @T1_Hints class used to record three               */
  /*    counter-controlled horizontal or vertical stems at once.           */
  /*                                                                       */
  /* @input:                                                               */
  /*    hints     :: A handle to the Type 1 hints recorder.                */
  /*                                                                       */
  /*    dimension :: 0 for horizontal stems, 1 for vertical ones.          */
  /*                                                                       */
  /*    coords    :: An array of 6 integers, holding 3 (position,length)   */
  /*                 pairs for the counter-controlled stems.               */
  /*                                                                       */
  /* @note:                                                                */
  /*    Use vertical coordinates (y) for horizontal stems (dim=0).  Use    */
  /*    horizontal coordinates (x) for vertical stems (dim=1).             */
  /*                                                                       */
  /*    The lengths cannot be negative (ghost stems are never              */
  /*    counter-controlled).                                               */
  /*                                                                       */
  typedef void
  (*T1_Hints_SetStem3Func)( T1_Hints  hints,
                            FT_UInt   dimension,
                            FT_Long*  coords );


  /*************************************************************************/
  /*                                                                       */
  /* @functype:                                                            */