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 28FT_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 249FT_END_HEADER 250 251 252#endif /* __PSHALGO_H__ */ 253 254 255/* END */ 256