kc3-lang/freetype/src/autohint/ahoptim.h

Branch : - branch - master v2.13 - tag -

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• Author : Werner Lemberg
  Date : 2001-06-28 17:49:10
  Hash : 415235df
  Message : finishing function header formatting updating copyrights

• src/autohint/ahoptim.h

• /***************************************************************************/
  /*                                                                         */
  /*  ahoptim.h                                                              */
  /*                                                                         */
  /*    FreeType auto hinting outline optimization (declaration).            */
  /*                                                                         */
  /*  Copyright 2000-2001 Catharon Productions Inc.                          */
  /*  Author: David Turner                                                   */
  /*                                                                         */
  /*  This file is part of the Catharon Typography Project and shall only    */
  /*  be used, modified, and distributed under the terms of the Catharon     */
  /*  Open Source License that should come with this file under the name     */
  /*  `CatharonLicense.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 that this license is compatible with the FreeType license.        */
  /*                                                                         */
  /***************************************************************************/
  
  
  #ifndef __AHOPTIM_H__
  #define __AHOPTIM_H__
  
  
  #include <ft2build.h>
  #include "ahtypes.h"
  
  
  FT_BEGIN_HEADER
  
  
    /* the maximal number of stem configurations to record */
    /* during optimization                                 */
  #define AH_MAX_CONFIGS  8
  
  
    typedef struct  AH_Stem_
    {
      FT_Pos    pos;       /* current position        */
      FT_Pos    velocity;  /* current velocity        */
      FT_Pos    force;     /* sum of current forces   */
      FT_Pos    width;     /* normalized width        */
  
      FT_Pos    min_pos;   /* minimum grid position */
      FT_Pos    max_pos;   /* maximum grid position */
  
      AH_Edge*  edge1;     /* left/bottom edge */
      AH_Edge*  edge2;     /* right/top edge   */
  
      FT_Pos    opos;      /* original position */
      FT_Pos    owidth;    /* original width    */
  
      FT_Pos    min_coord; /* minimum coordinate */
      FT_Pos    max_coord; /* maximum coordinate */
  
    } AH_Stem;
  
  
    /* A spring between two stems */
    typedef struct  AH_Spring_
    {
      AH_Stem*  stem1;
      AH_Stem*  stem2;
      FT_Pos    owidth;   /* original width  */
      FT_Pos    tension;  /* current tension */
  
    } AH_Spring;
  
  
    /* A configuration records the position of each stem at a given time  */
    /* as well as the associated distortion                               */
    typedef struct AH_Configuration_
    {
      FT_Pos*  positions;
      FT_Long  distortion;
  
    } AH_Configuration;
  
  
    typedef struct  AH_Optimizer_
    {
      FT_Memory         memory;
      AH_Outline*       outline;
  
      FT_Int            num_hstems;
      AH_Stem*          horz_stems;
  
      FT_Int            num_vstems;
      AH_Stem*          vert_stems;
  
      FT_Int            num_hsprings;
      FT_Int            num_vsprings;
      AH_Spring*        horz_springs;
      AH_Spring*        vert_springs;
  
      FT_Int            num_configs;
      AH_Configuration  configs[AH_MAX_CONFIGS];
      FT_Pos*           positions;
  
      /* during each pass, use these instead */
      FT_Int            num_stems;
      AH_Stem*          stems;
  
      FT_Int            num_springs;
      AH_Spring*        springs;
      FT_Bool           vertical;
  
      FT_Fixed          tension_scale;
      FT_Pos            tension_threshold;
  
    } AH_Optimizer;
  
  
    /* loads the outline into the optimizer */
    int
    AH_Optimizer_Init( AH_Optimizer*  optimizer,
                       AH_Outline*    outline,
                       FT_Memory      memory );
  
  
    /* compute optimal outline */
    void
    AH_Optimizer_Compute( AH_Optimizer*  optimizer );
  
  
    /* release the optimization data */
    void
    AH_Optimizer_Done( AH_Optimizer*  optimizer );
  
  
  FT_END_HEADER
  
  #endif /* __AHOPTIM_H__ */
  
  
  /* END */