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

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• Hash : 3469d0d0
  Author :
  Date : 2000-07-19T20:02:14
  

  added auto-hinter module. Note that the code has been cleaned up, and it seems a bug was introduced ??? I'll start checking this under Linux, as debugging is a lot easier under this environment..

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• src/autohint/ahoptim.h

• /***************************************************************************/
  /*                                                                         */
  /*  FreeType Auto-Gridder Outline Optimisation                             */
  /*                                                                         */
  /*  This module is in charge of optimising the outlines produced by the    */
  /*  auto-hinter in direct mode. This is required at small pixel sizes in   */
  /*  order to ensure coherent spacing, among other things..                 */
  /*                                                                         */
  /*  The technique used in this module is a simplified simulated annealing. */
  /*                                                                         */
  /*  Copyright 2000: 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 AGOPTIM_H
  #define AGOPTIM_H
  
  #ifdef FT_FLAT_COMPILE
  #include "ahtypes.h"
  #else
  #include <autohint/ahtypes.h>
  #endif
  
  /* the maximal number of stem configurations to record during optimisation */
  #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  distorsion;
  
    } 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 */
    extern
    int  AH_Optimizer_Init( AH_Optimizer*  optimizer,
                            AH_Outline*    outline,
                            FT_Memory      memory );
  
  
  
    /* compute optimal outline */
    extern
    void  AH_Optimizer_Compute( AH_Optimizer*  optimizer );
  
  
  
  
    /* releases the optimisation data */
    extern
    void AH_Optimizer_Done( AH_Optimizer*  optimizer );
  
  
  #endif /* AGOPTIM_H */
  

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