thirdparty/freetype-2.3.12/src/pshinter/pshalgo.h

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  pshalgo.h                                                              */
   4 /*                                                                         */
   5 /*    PostScript hinting algorithm (specification).                        */
   6 /*                                                                         */
   7 /*  Copyright 2001, 2002, 2003, 2008 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 __PSHALGO_H__
  20 #define __PSHALGO_H__
  21
  22
  23 #include "pshrec.h"
  24 #include "pshglob.h"
  25 #include FT_TRIGONOMETRY_H
  26
  27
  28 FT_BEGIN_HEADER
  29
  30
  31   /* handle to Hint structure */
  32   typedef struct PSH_HintRec_*  PSH_Hint;
  33
  34   /* hint bit-flags */
  35   typedef enum  PSH_Hint_Flags_
  36   {
  37     PSH_HINT_GHOST  = PS_HINT_FLAG_GHOST,
  38     PSH_HINT_BOTTOM = PS_HINT_FLAG_BOTTOM,
  39     PSH_HINT_ACTIVE = 4,
  40     PSH_HINT_FITTED = 8
  41
  42   } PSH_Hint_Flags;
  43
  44
  45 #define psh_hint_is_active( x )  ( ( (x)->flags & PSH_HINT_ACTIVE ) != 0 )
  46 #define psh_hint_is_ghost( x )   ( ( (x)->flags & PSH_HINT_GHOST  ) != 0 )
  47 #define psh_hint_is_fitted( x )  ( ( (x)->flags & PSH_HINT_FITTED ) != 0 )
  48
  49 #define psh_hint_activate( x )    (x)->flags |=  PSH_HINT_ACTIVE
  50 #define psh_hint_deactivate( x )  (x)->flags &= ~PSH_HINT_ACTIVE
  51 #define psh_hint_set_fitted( x )  (x)->flags |=  PSH_HINT_FITTED
  52
  53   /* hint structure */
  54   typedef struct  PSH_HintRec_
  55   {
  56     FT_Int    org_pos;
  57     FT_Int    org_len;
  58     FT_Pos    cur_pos;
  59     FT_Pos    cur_len;
  60     FT_UInt   flags;
  61     PSH_Hint  parent;
  62     FT_Int    order;
  63
  64   } PSH_HintRec;
  65
  66
  67   /* this is an interpolation zone used for strong points;  */
  68   /* weak points are interpolated according to their strong */
  69   /* neighbours                                             */
  70   typedef struct  PSH_ZoneRec_
  71   {
  72     FT_Fixed  scale;
  73     FT_Fixed  delta;
  74     FT_Pos    min;
  75     FT_Pos    max;
  76
  77   } PSH_ZoneRec, *PSH_Zone;
  78
  79
  80   typedef struct  PSH_Hint_TableRec_
  81   {
  82     FT_UInt        max_hints;
  83     FT_UInt        num_hints;
  84     PSH_Hint       hints;
  85     PSH_Hint*      sort;
  86     PSH_Hint*      sort_global;
  87     FT_UInt        num_zones;
  88     PSH_ZoneRec*   zones;
  89     PSH_Zone       zone;
  90     PS_Mask_Table  hint_masks;
  91     PS_Mask_Table  counter_masks;
  92
  93   } PSH_Hint_TableRec, *PSH_Hint_Table;
  94
  95
  96   typedef struct PSH_PointRec_*    PSH_Point;
  97   typedef struct PSH_ContourRec_*  PSH_Contour;
  98
  99   enum
 100   {
 101     PSH_DIR_NONE  =  4,
 102     PSH_DIR_UP    = -1,
 103     PSH_DIR_DOWN  =  1,
 104     PSH_DIR_LEFT  = -2,
 105     PSH_DIR_RIGHT =  2
 106   };
 107
 108 #define PSH_DIR_HORIZONTAL  2
 109 #define PSH_DIR_VERTICAL    1
 110
 111 #define PSH_DIR_COMPARE( d1, d2 )   ( (d1) == (d2) || (d1) == -(d2) )
 112 #define PSH_DIR_IS_HORIZONTAL( d )  PSH_DIR_COMPARE( d, PSH_DIR_HORIZONTAL )
 113 #define PSH_DIR_IS_VERTICAL( d )    PSH_DIR_COMPARE( d, PSH_DIR_VERTICAL )
 114
 115
 116  /* the following bit-flags are computed once by the glyph */
 117  /* analyzer, for both dimensions                          */
 118   enum
 119   {
 120     PSH_POINT_OFF    = 1,   /* point is off the curve */
 121     PSH_POINT_SMOOTH = 2,   /* point is smooth        */
 122     PSH_POINT_INFLEX = 4    /* point is inflection    */
 123   };
 124
 125 #define psh_point_is_smooth( p )  ( (p)->flags & PSH_POINT_SMOOTH )
 126 #define psh_point_is_off( p )     ( (p)->flags & PSH_POINT_OFF    )
 127 #define psh_point_is_inflex( p )  ( (p)->flags & PSH_POINT_INFLEX )
 128
 129 #define psh_point_set_smooth( p )  (p)->flags |= PSH_POINT_SMOOTH
 130 #define psh_point_set_off( p )     (p)->flags |= PSH_POINT_OFF
 131 #define psh_point_set_inflex( p )  (p)->flags |= PSH_POINT_INFLEX
 132
 133   /* the following bit-flags are re-computed for each dimension */
 134   enum
 135   {
 136     PSH_POINT_STRONG   = 16,   /* point is strong                           */
 137     PSH_POINT_FITTED   = 32,   /* point is already fitted                   */
 138     PSH_POINT_EXTREMUM = 64,   /* point is local extremum                   */
 139     PSH_POINT_POSITIVE = 128,  /* extremum has positive contour flow        */
 140     PSH_POINT_NEGATIVE = 256,  /* extremum has negative contour flow        */
 141     PSH_POINT_EDGE_MIN = 512,  /* point is aligned to left/bottom stem edge */
 142     PSH_POINT_EDGE_MAX = 1024  /* point is aligned to top/right stem edge   */
 143   };
 144
 145 #define psh_point_is_strong( p )    ( (p)->flags2 & PSH_POINT_STRONG )
 146 #define psh_point_is_fitted( p )    ( (p)->flags2 & PSH_POINT_FITTED )
 147 #define psh_point_is_extremum( p )  ( (p)->flags2 & PSH_POINT_EXTREMUM )
 148 #define psh_point_is_positive( p )  ( (p)->flags2 & PSH_POINT_POSITIVE )
 149 #define psh_point_is_negative( p )  ( (p)->flags2 & PSH_POINT_NEGATIVE )
 150 #define psh_point_is_edge_min( p )  ( (p)->flags2 & PSH_POINT_EDGE_MIN )
 151 #define psh_point_is_edge_max( p )  ( (p)->flags2 & PSH_POINT_EDGE_MAX )
 152
 153 #define psh_point_set_strong( p )    (p)->flags2 |= PSH_POINT_STRONG
 154 #define psh_point_set_fitted( p )    (p)->flags2 |= PSH_POINT_FITTED
 155 #define psh_point_set_extremum( p )  (p)->flags2 |= PSH_POINT_EXTREMUM
 156 #define psh_point_set_positive( p )  (p)->flags2 |= PSH_POINT_POSITIVE
 157 #define psh_point_set_negative( p )  (p)->flags2 |= PSH_POINT_NEGATIVE
 158 #define psh_point_set_edge_min( p )  (p)->flags2 |= PSH_POINT_EDGE_MIN
 159 #define psh_point_set_edge_max( p )  (p)->flags2 |= PSH_POINT_EDGE_MAX
 160
 161
 162   typedef struct  PSH_PointRec_
 163   {
 164     PSH_Point    prev;
 165     PSH_Point    next;
 166     PSH_Contour  contour;
 167     FT_UInt      flags;
 168     FT_UInt      flags2;
 169     FT_Char      dir_in;
 170     FT_Char      dir_out;
 171     FT_Angle     angle_in;
 172     FT_Angle     angle_out;
 173     PSH_Hint     hint;
 174     FT_Pos       org_u;
 175     FT_Pos       org_v;
 176     FT_Pos       cur_u;
 177 #ifdef DEBUG_HINTER
 178     FT_Pos       org_x;
 179     FT_Pos       cur_x;
 180     FT_Pos       org_y;
 181     FT_Pos       cur_y;
 182     FT_UInt      flags_x;
 183     FT_UInt      flags_y;
 184 #endif
 185
 186   } PSH_PointRec;
 187
 188
 189 #define PSH_POINT_EQUAL_ORG( a, b )  ( (a)->org_u == (b)->org_u && \
 190                                        (a)->org_v == (b)->org_v )
 191
 192 #define PSH_POINT_ANGLE( a, b )  FT_Atan2( (b)->org_u - (a)->org_u,  \
 193                                            (b)->org_v - (a)->org_v )
 194
 195   typedef struct  PSH_ContourRec_
 196   {
 197     PSH_Point  start;
 198     FT_UInt    count;
 199
 200   } PSH_ContourRec;
 201
 202
 203   typedef struct  PSH_GlyphRec_
 204   {
 205     FT_UInt            num_points;
 206     FT_UInt            num_contours;
 207
 208     PSH_Point          points;
 209     PSH_Contour        contours;
 210
 211     FT_Memory          memory;
 212     FT_Outline*        outline;
 213     PSH_Globals        globals;
 214     PSH_Hint_TableRec  hint_tables[2];
 215
 216     FT_Bool            vertical;
 217     FT_Int             major_dir;
 218     FT_Int             minor_dir;
 219
 220     FT_Bool            do_horz_hints;
 221     FT_Bool            do_vert_hints;
 222     FT_Bool            do_horz_snapping;
 223     FT_Bool            do_vert_snapping;
 224     FT_Bool            do_stem_adjust;
 225
 226   } PSH_GlyphRec, *PSH_Glyph;
 227
 228
 229 #ifdef DEBUG_HINTER
 230   extern PSH_Hint_Table  ps_debug_hint_table;
 231
 232   typedef void
 233   (*PSH_HintFunc)( PSH_Hint  hint,
 234                    FT_Bool   vertical );
 235
 236   extern PSH_HintFunc    ps_debug_hint_func;
 237
 238   extern PSH_Glyph       ps_debug_glyph;
 239 #endif
 240
 241
 242   extern FT_Error
 243   ps_hints_apply( PS_Hints        ps_hints,
 244                   FT_Outline*     outline,
 245                   PSH_Globals     globals,
 246                   FT_Render_Mode  hint_mode );
 247
 248
 249 FT_END_HEADER
 250
 251
 252 #endif /* __PSHALGO_H__ */
 253
 254
 255 /* END */