Home | History | Annotate | Download | only in pshinter
      1 /***************************************************************************/
      2 /*                                                                         */
      3 /*  pshglob.h                                                              */
      4 /*                                                                         */
      5 /*    PostScript hinter global hinting management.                         */
      6 /*                                                                         */
      7 /*  Copyright 2001, 2002, 2003 by                                          */
      8 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
      9 /*                                                                         */
     10 /*  This file is part of the FreeType project, and may only be used,       */
     11 /*  modified, and distributed under the terms of the FreeType project      */
     12 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
     13 /*  this file you indicate that you have read the license and              */
     14 /*  understand and accept it fully.                                        */
     15 /*                                                                         */
     16 /***************************************************************************/
     17 
     18 
     19 #ifndef __PSHGLOB_H__
     20 #define __PSHGLOB_H__
     21 
     22 
     23 #include FT_FREETYPE_H
     24 #include FT_INTERNAL_POSTSCRIPT_HINTS_H
     25 
     26 
     27 FT_BEGIN_HEADER
     28 
     29 
     30   /*************************************************************************/
     31   /*************************************************************************/
     32   /*****                                                               *****/
     33   /*****                    GLOBAL HINTS INTERNALS                     *****/
     34   /*****                                                               *****/
     35   /*************************************************************************/
     36   /*************************************************************************/
     37 
     38 
     39   /*************************************************************************/
     40   /*                                                                       */
     41   /* @constant:                                                            */
     42   /*    PS_GLOBALS_MAX_BLUE_ZONES                                          */
     43   /*                                                                       */
     44   /* @description:                                                         */
     45   /*    The maximum number of blue zones in a font global hints structure. */
     46   /*    See @PS_Globals_BluesRec.                                          */
     47   /*                                                                       */
     48 #define PS_GLOBALS_MAX_BLUE_ZONES  16
     49 
     50 
     51   /*************************************************************************/
     52   /*                                                                       */
     53   /* @constant:                                                            */
     54   /*    PS_GLOBALS_MAX_STD_WIDTHS                                          */
     55   /*                                                                       */
     56   /* @description:                                                         */
     57   /*    The maximum number of standard and snap widths in either the       */
     58   /*    horizontal or vertical direction.  See @PS_Globals_WidthsRec.      */
     59   /*                                                                       */
     60 #define PS_GLOBALS_MAX_STD_WIDTHS  16
     61 
     62 
     63   /* standard and snap width */
     64   typedef struct  PSH_WidthRec_
     65   {
     66     FT_Int  org;
     67     FT_Pos  cur;
     68     FT_Pos  fit;
     69 
     70   } PSH_WidthRec, *PSH_Width;
     71 
     72 
     73   /* standard and snap widths table */
     74   typedef struct  PSH_WidthsRec_
     75   {
     76     FT_UInt       count;
     77     PSH_WidthRec  widths[PS_GLOBALS_MAX_STD_WIDTHS];
     78 
     79   } PSH_WidthsRec, *PSH_Widths;
     80 
     81 
     82   typedef struct  PSH_DimensionRec_
     83   {
     84     PSH_WidthsRec  stdw;
     85     FT_Fixed       scale_mult;
     86     FT_Fixed       scale_delta;
     87 
     88   } PSH_DimensionRec, *PSH_Dimension;
     89 
     90 
     91   /* blue zone descriptor */
     92   typedef struct  PSH_Blue_ZoneRec_
     93   {
     94     FT_Int  org_ref;
     95     FT_Int  org_delta;
     96     FT_Int  org_top;
     97     FT_Int  org_bottom;
     98 
     99     FT_Pos  cur_ref;
    100     FT_Pos  cur_delta;
    101     FT_Pos  cur_bottom;
    102     FT_Pos  cur_top;
    103 
    104   } PSH_Blue_ZoneRec, *PSH_Blue_Zone;
    105 
    106 
    107   typedef struct  PSH_Blue_TableRec_
    108   {
    109     FT_UInt           count;
    110     PSH_Blue_ZoneRec  zones[PS_GLOBALS_MAX_BLUE_ZONES];
    111 
    112   } PSH_Blue_TableRec, *PSH_Blue_Table;
    113 
    114 
    115   /* blue zones table */
    116   typedef struct  PSH_BluesRec_
    117   {
    118     PSH_Blue_TableRec  normal_top;
    119     PSH_Blue_TableRec  normal_bottom;
    120     PSH_Blue_TableRec  family_top;
    121     PSH_Blue_TableRec  family_bottom;
    122 
    123     FT_Fixed           blue_scale;
    124     FT_Int             blue_shift;
    125     FT_Int             blue_threshold;
    126     FT_Int             blue_fuzz;
    127     FT_Bool            no_overshoots;
    128 
    129   } PSH_BluesRec, *PSH_Blues;
    130 
    131 
    132   /* font globals.                                         */
    133   /* dimension 0 => X coordinates + vertical hints/stems   */
    134   /* dimension 1 => Y coordinates + horizontal hints/stems */
    135   typedef struct  PSH_GlobalsRec_
    136   {
    137     FT_Memory         memory;
    138     PSH_DimensionRec  dimension[2];
    139     PSH_BluesRec      blues;
    140 
    141   } PSH_GlobalsRec;
    142 
    143 
    144 #define PSH_BLUE_ALIGN_NONE  0
    145 #define PSH_BLUE_ALIGN_TOP   1
    146 #define PSH_BLUE_ALIGN_BOT   2
    147 
    148 
    149   typedef struct  PSH_AlignmentRec_
    150   {
    151     int     align;
    152     FT_Pos  align_top;
    153     FT_Pos  align_bot;
    154 
    155   } PSH_AlignmentRec, *PSH_Alignment;
    156 
    157 
    158   FT_LOCAL( void )
    159   psh_globals_funcs_init( PSH_Globals_FuncsRec*  funcs );
    160 
    161 
    162 #if 0
    163   /* snap a stem width to fitter coordinates.  `org_width' is in font */
    164   /* units.  The result is in device pixels (26.6 format).            */
    165   FT_LOCAL( FT_Pos )
    166   psh_dimension_snap_width( PSH_Dimension  dimension,
    167                             FT_Int         org_width );
    168 #endif
    169 
    170   FT_LOCAL( FT_Error )
    171   psh_globals_set_scale( PSH_Globals  globals,
    172                          FT_Fixed     x_scale,
    173                          FT_Fixed     y_scale,
    174                          FT_Fixed     x_delta,
    175                          FT_Fixed     y_delta );
    176 
    177   /* snap a stem to one or two blue zones */
    178   FT_LOCAL( void )
    179   psh_blues_snap_stem( PSH_Blues      blues,
    180                        FT_Int         stem_top,
    181                        FT_Int         stem_bot,
    182                        PSH_Alignment  alignment );
    183   /* */
    184 
    185 #ifdef DEBUG_HINTER
    186   extern PSH_Globals  ps_debug_globals;
    187 #endif
    188 
    189 
    190 FT_END_HEADER
    191 
    192 
    193 #endif /* __PSHGLOB_H__ */
    194 
    195 
    196 /* END */
    197