freetype2/src/pshinter/pshglob.h

/***************************************************************************/
/*                                                                         */
/*  pshglob.h                                                              */
/*                                                                         */
/*    PostScript hinter global hinting management.                         */
/*                                                                         */
/*  Copyright 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 __PSHGLOB_H__
#define __PSHGLOB_H__


#include FT_FREETYPE_H
#include FT_INTERNAL_POSTSCRIPT_GLOBALS_H
#include FT_INTERNAL_POSTSCRIPT_HINTS_H


FT_BEGIN_HEADER


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                    GLOBAL HINTS INTERNALS                     *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* @constant:                                                            */
  /*    PS_GLOBALS_MAX_BLUE_ZONES                                          */
  /*                                                                       */
  /* @description:                                                         */
  /*    The maximum number of blue zones in a font global hints structure. */
  /*    See @PS_Globals_BluesRec.                                          */
  /*                                                                       */
#define PS_GLOBALS_MAX_BLUE_ZONES  16


  /*************************************************************************/
  /*                                                                       */
  /* @constant:                                                            */
  /*    PS_GLOBALS_MAX_STD_WIDTHS                                          */
  /*                                                                       */
  /* @description:                                                         */
  /*    The maximum number of standard and snap widths in either the       */
  /*    horizontal or vertical direction.  See @PS_Globals_WidthsRec.      */
  /*                                                                       */
#define PS_GLOBALS_MAX_STD_WIDTHS  16


  /* standard and snap width */
  typedef struct  PSH_WidthRec_
  {
    FT_Int  org;
    FT_Pos  cur;
    FT_Pos  fit;

  } PSH_WidthRec, *PSH_Width;


  /* standard and snap widths table */
  typedef struct  PSH_WidthsRec_
  {
    FT_UInt       count;
    PSH_WidthRec  widths[PS_GLOBALS_MAX_STD_WIDTHS];

  } PSH_WidthsRec, *PSH_Widths;


  typedef struct  PSH_DimensionRec_
  {
    PSH_WidthsRec  std;
    FT_Fixed       scale_mult;
    FT_Fixed       scale_delta;

  } PSH_DimensionRec, *PSH_Dimension;


  /* blue zone descriptor */
  typedef struct  PSH_Blue_ZoneRec_
  {
    FT_Int  org_ref;
    FT_Int  org_delta;
    FT_Int  org_top;
    FT_Int  org_bottom;

    FT_Pos  cur_ref;
    FT_Pos  cur_delta;
    FT_Pos  cur_bottom;
    FT_Pos  cur_top;

  } PSH_Blue_ZoneRec, *PSH_Blue_Zone;


  typedef struct  PSH_Blue_TableRec_
  {
    FT_UInt           count;
    PSH_Blue_ZoneRec  zones[PS_GLOBALS_MAX_BLUE_ZONES];

  } PSH_Blue_TableRec, *PSH_Blue_Table;


  /* blue zones table */
  typedef struct  PSH_BluesRec_
  {
    PSH_Blue_TableRec  normal_top;
    PSH_Blue_TableRec  normal_bottom;
    PSH_Blue_TableRec  family_top;
    PSH_Blue_TableRec  family_bottom;

    FT_Fixed           blue_scale;
    FT_Int             blue_shift;
    FT_Int             blue_threshold;
    FT_Bool            no_overshoots;

  } PSH_BluesRec, *PSH_Blues;


  /* font globals.                                         */
  /* dimension 0 => X coordinates + vertical hints/stems   */
  /* dimension 1 => Y coordinates + horizontal hints/stems */
  typedef struct  PSH_GlobalsRec_
  {
    FT_Memory         memory;
    PSH_DimensionRec  dimension[2];
    PSH_BluesRec      blues;

  } PSH_GlobalsRec;


  typedef enum
  {
    PSH_BLUE_ALIGN_NONE = 0,
    PSH_BLUE_ALIGN_TOP = 1,
    PSH_BLUE_ALIGN_BOT = 2

  } PSH_Blue_Align;


  typedef struct  PSH_AlignmentRec_
  {
    PSH_Blue_Align  align;
    FT_Pos          align_top;
    FT_Pos          align_bot;

  } PSH_AlignmentRec, *PSH_Alignment;


  FT_LOCAL( void )
  psh_globals_funcs_init( PSH_Globals_FuncsRec*  funcs );


  /* snap a stem width to fitter coordinates.  `org_width' is in font */
  /* units.  The result is in device pixels (26.6 format).            */
  FT_LOCAL( FT_Pos )
  psh_dimension_snap_width( PSH_Dimension  dimension,
                            FT_Int         org_width );

  /* snap a stem to one or two blue zones */
  FT_LOCAL( void )
  psh_blues_snap_stem( PSH_Blues      blues,
                       FT_Int         stem_top,
                       FT_Int         stem_bot,
                       PSH_Alignment  alignment );
  /* */

#ifdef DEBUG_HINTER
  extern PSH_Globals  ps_debug_globals;
#endif


FT_END_HEADER


#endif /* __PSHGLOB_H__ */


/* END */