David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1 | /***************************************************************************/ |
| 2 | /* */ |
| 3 | /* ahhint.c */ |
| 4 | /* */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 5 | /* Glyph hinter (body). */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 6 | /* */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 7 | /* Copyright 2000 Catharon Productions Inc. */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 8 | /* Author: David Turner */ |
| 9 | /* */ |
| 10 | /* This file is part of the Catharon Typography Project and shall only */ |
| 11 | /* be used, modified, and distributed under the terms of the Catharon */ |
| 12 | /* Open Source License that should come with this file under the name */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 13 | /* `CatharonLicense.txt'. By continuing to use, modify, or distribute */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 14 | /* this file you indicate that you have read the license and */ |
| 15 | /* understand and accept it fully. */ |
| 16 | /* */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 17 | /* Note that this license is compatible with the FreeType license. */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 18 | /* */ |
| 19 | /***************************************************************************/ |
| 20 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 21 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 22 | #ifdef FT_FLAT_COMPILE |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 23 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 24 | #include "ahhint.h" |
| 25 | #include "ahglyph.h" |
| 26 | #include "ahangles.h" |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 27 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 28 | #else |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 29 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 30 | #include <autohint/ahhint.h> |
| 31 | #include <autohint/ahglyph.h> |
| 32 | #include <autohint/ahangles.h> |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 33 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 34 | #endif |
| 35 | |
| 36 | #include <freetype/ftoutln.h> |
| 37 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 38 | |
| 39 | #define FACE_GLOBALS( face ) ((AH_Face_Globals*)(face)->autohint.data) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 40 | |
| 41 | #define AH_USE_IUP |
| 42 | |
| 43 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 44 | /*************************************************************************/ |
| 45 | /*************************************************************************/ |
| 46 | /**** ****/ |
| 47 | /**** Hinting routines ****/ |
| 48 | /**** ****/ |
| 49 | /*************************************************************************/ |
| 50 | /*************************************************************************/ |
| 51 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 52 | |
| 53 | static int disable_horz_edges = 0; |
| 54 | static int disable_vert_edges = 0; |
| 55 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 56 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 57 | /* snap a given width in scaled coordinates to one of the */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 58 | /* current standard widths */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 59 | static |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 60 | FT_Pos ah_snap_width( FT_Pos* widths, |
| 61 | FT_Int count, |
| 62 | FT_Pos width ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 63 | { |
| 64 | int n; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 65 | FT_Pos best = 64 + 32 + 2; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 66 | FT_Pos reference = width; |
| 67 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 68 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 69 | for ( n = 0; n < count; n++ ) |
| 70 | { |
| 71 | FT_Pos w; |
| 72 | FT_Pos dist; |
| 73 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 74 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 75 | w = widths[n]; |
| 76 | dist = width - w; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 77 | if ( dist < 0 ) |
| 78 | dist = -dist; |
| 79 | if ( dist < best ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 80 | { |
| 81 | best = dist; |
| 82 | reference = w; |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | if ( width >= reference ) |
| 87 | { |
| 88 | width -= 0x21; |
| 89 | if ( width < reference ) |
| 90 | width = reference; |
| 91 | } |
| 92 | else |
| 93 | { |
| 94 | width += 0x21; |
| 95 | if ( width > reference ) |
| 96 | width = reference; |
| 97 | } |
| 98 | |
| 99 | return width; |
| 100 | } |
| 101 | |
| 102 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 103 | /* align one stem edge relative to the previous stem edge */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 104 | static |
| 105 | void ah_align_linked_edge( AH_Hinter* hinter, |
| 106 | AH_Edge* base_edge, |
| 107 | AH_Edge* stem_edge, |
| 108 | int vertical ) |
| 109 | { |
| 110 | FT_Pos dist = stem_edge->opos - base_edge->opos; |
| 111 | AH_Globals* globals = &hinter->globals->scaled; |
| 112 | FT_Pos sign = 1; |
| 113 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 114 | |
| 115 | if ( dist < 0 ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 116 | { |
| 117 | dist = -dist; |
| 118 | sign = -1; |
| 119 | } |
| 120 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 121 | if ( vertical ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 122 | { |
| 123 | dist = ah_snap_width( globals->heights, globals->num_heights, dist ); |
| 124 | |
| 125 | /* in the case of vertical hinting, always round */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 126 | /* the stem heights to integer pixels */ |
| 127 | if ( dist >= 64 ) |
| 128 | dist = ( dist + 16 ) & -64; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 129 | else |
| 130 | dist = 64; |
| 131 | } |
| 132 | else |
| 133 | { |
| 134 | dist = ah_snap_width( globals->widths, globals->num_widths, dist ); |
| 135 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 136 | if ( hinter->flags & ah_hinter_monochrome ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 137 | { |
| 138 | /* monochrome horizontal hinting: snap widths to integer pixels */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 139 | /* with a different threshold */ |
| 140 | if ( dist < 64 ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 141 | dist = 64; |
| 142 | else |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 143 | dist = ( dist + 32 ) & -64; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 144 | } |
| 145 | else |
| 146 | { |
| 147 | /* for horizontal anti-aliased hinting, we adopt a more subtle */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 148 | /* approach: we strengthen small stems, round stems whose size */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 149 | /* is between 1 and 2 pixels to an integer, otherwise nothing */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 150 | if ( dist < 48 ) |
| 151 | dist = ( dist + 64 ) >> 1; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 152 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 153 | else if ( dist < 128 ) |
| 154 | dist = ( dist + 42 ) & -64; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 155 | } |
| 156 | } |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 157 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 158 | stem_edge->pos = base_edge->pos + sign * dist; |
| 159 | } |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 160 | |
| 161 | |
| 162 | static |
| 163 | void ah_align_serif_edge( AH_Hinter* hinter, |
| 164 | AH_Edge* base, |
| 165 | AH_Edge* serif ) |
| 166 | { |
| 167 | FT_Pos dist; |
| 168 | FT_Pos sign = 1; |
| 169 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 170 | UNUSED( hinter ); |
| 171 | |
| 172 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 173 | dist = serif->opos - base->opos; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 174 | if ( dist < 0 ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 175 | { |
| 176 | dist = -dist; |
| 177 | sign = -1; |
| 178 | } |
| 179 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 180 | /* do not strengthen serifs */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 181 | if ( base->flags & ah_edge_done ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 182 | { |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 183 | if ( dist > 64 ) |
| 184 | dist = ( dist + 16 ) & -64; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 185 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 186 | else if ( dist <= 32 ) |
| 187 | dist = ( dist + 33 ) >> 1; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 188 | } |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 189 | |
| 190 | serif->pos = base->pos + sign * dist; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 191 | } |
| 192 | |
| 193 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 194 | /*************************************************************************/ |
| 195 | /*************************************************************************/ |
| 196 | /*************************************************************************/ |
| 197 | /**** ****/ |
| 198 | /**** E D G E H I N T I N G ****/ |
| 199 | /**** ****/ |
| 200 | /*************************************************************************/ |
| 201 | /*************************************************************************/ |
| 202 | /*************************************************************************/ |
| 203 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 204 | |
| 205 | /* Another alternative edge hinting algorithm */ |
| 206 | static |
| 207 | void ah_hint_edges_3( AH_Hinter* hinter ) |
| 208 | { |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 209 | AH_Edge* edges; |
| 210 | AH_Edge* edge_limit; |
| 211 | AH_Outline* outline = hinter->glyph; |
| 212 | FT_Int dimension; |
| 213 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 214 | |
| 215 | edges = outline->horz_edges; |
| 216 | edge_limit = edges + outline->num_hedges; |
| 217 | |
| 218 | for ( dimension = 1; dimension >= 0; dimension-- ) |
| 219 | { |
| 220 | AH_Edge* edge; |
| 221 | AH_Edge* before = 0; |
| 222 | AH_Edge* after = 0; |
| 223 | AH_Edge* anchor = 0; |
| 224 | int has_serifs = 0; |
| 225 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 226 | |
| 227 | if ( disable_vert_edges && !dimension ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 228 | goto Next_Dimension; |
| 229 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 230 | if ( disable_horz_edges && dimension ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 231 | goto Next_Dimension; |
| 232 | |
| 233 | /* we begin by aligning all stems relative to the blue zone */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 234 | /* if needed -- that's only for horizontal edges */ |
| 235 | if ( dimension ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 236 | { |
| 237 | for ( edge = edges; edge < edge_limit; edge++ ) |
| 238 | { |
| 239 | FT_Pos* blue; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 240 | AH_Edge *edge1, *edge2; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 241 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 242 | |
| 243 | if ( edge->flags & ah_edge_done ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 244 | continue; |
| 245 | |
| 246 | blue = edge->blue_edge; |
| 247 | edge1 = 0; |
| 248 | edge2 = edge->link; |
| 249 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 250 | if ( blue ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 251 | { |
| 252 | edge1 = edge; |
| 253 | } |
| 254 | else if (edge2 && edge2->blue_edge) |
| 255 | { |
| 256 | blue = edge2->blue_edge; |
| 257 | edge1 = edge2; |
| 258 | edge2 = edge; |
| 259 | } |
| 260 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 261 | if ( !edge1 ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 262 | continue; |
| 263 | |
| 264 | edge1->pos = blue[0]; |
| 265 | edge1->flags |= ah_edge_done; |
| 266 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 267 | if ( edge2 && !edge2->blue_edge ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 268 | { |
| 269 | ah_align_linked_edge( hinter, edge1, edge2, dimension ); |
| 270 | edge2->flags |= ah_edge_done; |
| 271 | } |
| 272 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 273 | if ( !anchor ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 274 | anchor = edge; |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | /* now, we will align all stem edges, trying to maintain the */ |
| 279 | /* relative order of stems in the glyph.. */ |
| 280 | before = 0; |
| 281 | after = 0; |
| 282 | for ( edge = edges; edge < edge_limit; edge++ ) |
| 283 | { |
| 284 | AH_Edge *edge2; |
| 285 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 286 | |
| 287 | if ( edge->flags & ah_edge_done ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 288 | continue; |
| 289 | |
| 290 | /* skip all non-stem edges */ |
| 291 | edge2 = edge->link; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 292 | if ( !edge2 ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 293 | { |
| 294 | has_serifs++; |
| 295 | continue; |
| 296 | } |
| 297 | |
| 298 | /* now, align the stem */ |
| 299 | |
| 300 | /* this should not happen, but it's better to be safe.. */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 301 | if ( edge2->blue_edge || edge2 < edge ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 302 | { |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 303 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 304 | #if 0 |
| 305 | printf( "strange blue alignement, edge %d to %d\n", |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 306 | edge - edges, edge2 - edges ); |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 307 | #endif |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 308 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 309 | ah_align_linked_edge( hinter, edge2, edge, dimension ); |
| 310 | edge->flags |= ah_edge_done; |
| 311 | continue; |
| 312 | } |
| 313 | |
| 314 | { |
| 315 | FT_Bool min = 0; |
| 316 | FT_Pos delta; |
| 317 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 318 | if ( !anchor ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 319 | { |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 320 | edge->pos = ( edge->opos + 32 ) & -64; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 321 | anchor = edge; |
| 322 | } |
| 323 | else |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 324 | edge->pos = anchor->pos + |
| 325 | ( ( edge->opos - anchor->opos + 32 ) & -64 ); |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 326 | |
| 327 | edge->flags |= ah_edge_done; |
| 328 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 329 | if ( edge > edges && edge->pos < edge[-1].pos ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 330 | { |
| 331 | edge->pos = edge[-1].pos; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 332 | min = 1; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 333 | } |
| 334 | |
| 335 | ah_align_linked_edge( hinter, edge, edge2, dimension ); |
| 336 | delta = 0; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 337 | if ( edge2 + 1 < edge_limit && |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 338 | edge2[1].flags & ah_edge_done ) |
| 339 | delta = edge2[1].pos - edge2->pos; |
| 340 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 341 | if ( delta < 0 ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 342 | { |
| 343 | edge2->pos += delta; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 344 | if ( !min ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 345 | edge->pos += delta; |
| 346 | } |
| 347 | edge2->flags |= ah_edge_done; |
| 348 | } |
| 349 | } |
| 350 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 351 | if ( !has_serifs ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 352 | goto Next_Dimension; |
| 353 | |
| 354 | /* now, hint the remaining edges (serifs and single) in order */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 355 | /* to complete our processing */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 356 | for ( edge = edges; edge < edge_limit; edge++ ) |
| 357 | { |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 358 | if ( edge->flags & ah_edge_done ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 359 | continue; |
| 360 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 361 | if ( edge->serif ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 362 | { |
| 363 | ah_align_serif_edge( hinter, edge->serif, edge ); |
| 364 | } |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 365 | else if ( !anchor ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 366 | { |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 367 | edge->pos = ( edge->opos + 32 ) & -64; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 368 | anchor = edge; |
| 369 | } |
| 370 | else |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 371 | edge->pos = anchor->pos + |
| 372 | ( ( edge->opos-anchor->opos + 32 ) & -64 ); |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 373 | |
| 374 | edge->flags |= ah_edge_done; |
| 375 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 376 | if ( edge > edges && edge->pos < edge[-1].pos ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 377 | edge->pos = edge[-1].pos; |
| 378 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 379 | if ( edge + 1 < edge_limit && |
| 380 | edge[1].flags & ah_edge_done && |
| 381 | edge->pos > edge[1].pos ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 382 | edge->pos = edge[1].pos; |
| 383 | } |
| 384 | |
| 385 | Next_Dimension: |
| 386 | edges = outline->vert_edges; |
| 387 | edge_limit = edges + outline->num_vedges; |
| 388 | } |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | |
David Turner | 76a5f62 | 2000-11-04 01:55:49 +0000 | [diff] [blame] | 392 | FT_LOCAL_DEF |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 393 | void ah_hinter_hint_edges( AH_Hinter* hinter, |
| 394 | int no_horz_edges, |
| 395 | int no_vert_edges ) |
| 396 | { |
| 397 | disable_horz_edges = no_horz_edges; |
| 398 | disable_vert_edges = no_vert_edges; |
| 399 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 400 | /* AH_Interpolate_Blue_Edges( hinter ); -- doesn't seem to help */ |
| 401 | /* reduce the problem of the disappearing eye in the `e' of Times... */ |
| 402 | /* also, creates some artifacts near the blue zones? */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 403 | { |
| 404 | ah_hint_edges_3( hinter ); |
| 405 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 406 | #if 0 |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 407 | /* outline optimizer removed temporarily */ |
| 408 | if ( hinter->flags & ah_hinter_optimize ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 409 | { |
| 410 | AH_Optimizer opt; |
| 411 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 412 | |
| 413 | if ( !AH_Optimizer_Init( &opt, hinter->glyph, hinter->memory ) ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 414 | { |
| 415 | AH_Optimizer_Compute( &opt ); |
| 416 | AH_Optimizer_Done( &opt ); |
| 417 | } |
| 418 | } |
| 419 | #endif |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 420 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 421 | } |
| 422 | } |
| 423 | |
| 424 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 425 | /*************************************************************************/ |
| 426 | /*************************************************************************/ |
| 427 | /*************************************************************************/ |
| 428 | /**** ****/ |
| 429 | /**** P O I N T H I N T I N G ****/ |
| 430 | /**** ****/ |
| 431 | /*************************************************************************/ |
| 432 | /*************************************************************************/ |
| 433 | /*************************************************************************/ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 434 | |
| 435 | static |
| 436 | void ah_hinter_align_edge_points( AH_Hinter* hinter ) |
| 437 | { |
| 438 | AH_Outline* outline = hinter->glyph; |
| 439 | AH_Edge* edges; |
| 440 | AH_Edge* edge_limit; |
| 441 | FT_Int dimension; |
| 442 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 443 | |
| 444 | edges = outline->horz_edges; |
| 445 | edge_limit = edges + outline->num_hedges; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 446 | |
| 447 | for ( dimension = 1; dimension >= 0; dimension-- ) |
| 448 | { |
| 449 | AH_Edge* edge; |
| 450 | AH_Edge* before; |
| 451 | AH_Edge* after; |
| 452 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 453 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 454 | before = 0; |
| 455 | after = 0; |
| 456 | |
| 457 | edge = edges; |
| 458 | for ( ; edge < edge_limit; edge++ ) |
| 459 | { |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 460 | /* move the points of each segment */ |
| 461 | /* in each edge to the edge's position */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 462 | AH_Segment* seg = edge->first; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 463 | |
| 464 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 465 | do |
| 466 | { |
| 467 | AH_Point* point = seg->first; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 468 | |
| 469 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 470 | for (;;) |
| 471 | { |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 472 | if ( dimension ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 473 | { |
| 474 | point->y = edge->pos; |
| 475 | point->flags |= ah_flah_touch_y; |
| 476 | } |
| 477 | else |
| 478 | { |
| 479 | point->x = edge->pos; |
| 480 | point->flags |= ah_flah_touch_x; |
| 481 | } |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 482 | |
| 483 | if ( point == seg->last ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 484 | break; |
| 485 | |
| 486 | point = point->next; |
| 487 | } |
| 488 | |
| 489 | seg = seg->edge_next; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 490 | |
| 491 | } while ( seg != edge->first ); |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 492 | } |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 493 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 494 | edges = outline->vert_edges; |
| 495 | edge_limit = edges + outline->num_vedges; |
| 496 | } |
| 497 | } |
| 498 | |
| 499 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 500 | /* hint the strong points -- this is equivalent to the TrueType `IP' */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 501 | static |
| 502 | void ah_hinter_align_strong_points( AH_Hinter* hinter ) |
| 503 | { |
| 504 | AH_Outline* outline = hinter->glyph; |
| 505 | FT_Int dimension; |
| 506 | AH_Edge* edges; |
| 507 | AH_Edge* edge_limit; |
| 508 | AH_Point* points; |
| 509 | AH_Point* point_limit; |
| 510 | AH_Flags touch_flag; |
| 511 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 512 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 513 | points = outline->points; |
| 514 | point_limit = points + outline->num_points; |
| 515 | |
| 516 | edges = outline->horz_edges; |
| 517 | edge_limit = edges + outline->num_hedges; |
| 518 | touch_flag = ah_flah_touch_y; |
| 519 | |
| 520 | for ( dimension = 1; dimension >= 0; dimension-- ) |
| 521 | { |
| 522 | AH_Point* point; |
| 523 | AH_Edge* edge; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 524 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 525 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 526 | if ( edges < edge_limit ) |
| 527 | for ( point = points; point < point_limit; point++ ) |
| 528 | { |
| 529 | FT_Pos u, ou, fu; /* point position */ |
| 530 | FT_Pos delta; |
| 531 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 532 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 533 | if ( point->flags & touch_flag ) |
| 534 | continue; |
| 535 | |
| 536 | #ifndef AH_OPTION_NO_WEAK_INTERPOLATION |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 537 | /* if this point is candidate to weak interpolation, we will */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 538 | /* interpolate it after all strong points have been processed */ |
| 539 | if ( point->flags & ah_flah_weak_interpolation ) |
| 540 | continue; |
| 541 | #endif |
| 542 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 543 | if ( dimension ) |
| 544 | { |
| 545 | u = point->fy; |
| 546 | ou = point->oy; |
| 547 | } |
| 548 | else |
| 549 | { |
| 550 | u = point->fx; |
| 551 | ou = point->ox; |
| 552 | } |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 553 | |
| 554 | fu = u; |
| 555 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 556 | /* is the point before the first edge? */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 557 | edge = edges; |
| 558 | delta = edge->fpos - u; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 559 | if ( delta >= 0 ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 560 | { |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 561 | u = edge->pos - ( edge->opos - ou ); |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 562 | goto Store_Point; |
| 563 | } |
| 564 | |
| 565 | /* is the point after the last edge ? */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 566 | edge = edge_limit - 1; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 567 | delta = u - edge->fpos; |
| 568 | if ( delta >= 0 ) |
| 569 | { |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 570 | u = edge->pos + ( ou - edge->opos ); |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 571 | goto Store_Point; |
| 572 | } |
| 573 | |
| 574 | /* otherwise, interpolate the point in between */ |
| 575 | { |
| 576 | AH_Edge* before = 0; |
| 577 | AH_Edge* after = 0; |
| 578 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 579 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 580 | for ( edge = edges; edge < edge_limit; edge++ ) |
| 581 | { |
| 582 | if ( u == edge->fpos ) |
| 583 | { |
| 584 | u = edge->pos; |
| 585 | goto Store_Point; |
| 586 | } |
| 587 | if ( u < edge->fpos ) |
| 588 | break; |
| 589 | before = edge; |
| 590 | } |
| 591 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 592 | for ( edge = edge_limit - 1; edge >= edges; edge-- ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 593 | { |
| 594 | if ( u == edge->fpos ) |
| 595 | { |
| 596 | u = edge->pos; |
| 597 | goto Store_Point; |
| 598 | } |
| 599 | if ( u > edge->fpos ) |
| 600 | break; |
| 601 | after = edge; |
| 602 | } |
| 603 | |
| 604 | /* assert( before && after && before != after ) */ |
| 605 | u = before->pos + FT_MulDiv( fu - before->fpos, |
| 606 | after->pos - before->pos, |
| 607 | after->fpos - before->fpos ); |
| 608 | } |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 609 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 610 | Store_Point: |
| 611 | |
| 612 | /* save the point position */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 613 | if ( dimension ) |
| 614 | point->y = u; |
| 615 | else |
| 616 | point->x = u; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 617 | |
| 618 | point->flags |= touch_flag; |
| 619 | } |
| 620 | |
| 621 | edges = outline->vert_edges; |
| 622 | edge_limit = edges + outline->num_vedges; |
| 623 | touch_flag = ah_flah_touch_x; |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | |
| 628 | #ifndef AH_OPTION_NO_WEAK_INTERPOLATION |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 629 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 630 | static |
| 631 | void ah_iup_shift( AH_Point* p1, |
| 632 | AH_Point* p2, |
| 633 | AH_Point* ref ) |
| 634 | { |
| 635 | AH_Point* p; |
| 636 | FT_Pos delta = ref->u - ref->v; |
| 637 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 638 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 639 | for ( p = p1; p < ref; p++ ) |
| 640 | p->u = p->v + delta; |
| 641 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 642 | for ( p = ref + 1; p <= p2; p++ ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 643 | p->u = p->v + delta; |
| 644 | } |
| 645 | |
| 646 | |
| 647 | static |
| 648 | void ah_iup_interp( AH_Point* p1, |
| 649 | AH_Point* p2, |
| 650 | AH_Point* ref1, |
| 651 | AH_Point* ref2 ) |
| 652 | { |
| 653 | AH_Point* p; |
| 654 | FT_Pos u; |
| 655 | FT_Pos v1 = ref1->v; |
| 656 | FT_Pos v2 = ref2->v; |
| 657 | FT_Pos d1 = ref1->u - v1; |
| 658 | FT_Pos d2 = ref2->u - v2; |
| 659 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 660 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 661 | if ( p1 > p2 ) |
| 662 | return; |
| 663 | |
| 664 | if ( v1 == v2 ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 665 | { |
| 666 | for ( p = p1; p <= p2; p++ ) |
| 667 | { |
Werner Lemberg | e72c9fe | 2000-07-31 18:59:02 +0000 | [diff] [blame] | 668 | u = p->v; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 669 | |
| 670 | if ( u <= v1 ) |
| 671 | u += d1; |
| 672 | else |
| 673 | u += d2; |
| 674 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 675 | p->u = u; |
| 676 | } |
| 677 | return; |
| 678 | } |
| 679 | |
| 680 | if ( v1 < v2 ) |
| 681 | { |
| 682 | for ( p = p1; p <= p2; p++ ) |
| 683 | { |
| 684 | u = p->v; |
| 685 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 686 | if ( u <= v1 ) |
| 687 | u += d1; |
| 688 | else if ( u >= v2 ) |
| 689 | u += d2; |
| 690 | else |
| 691 | u = ref1->u + FT_MulDiv( u - v1, ref2->u - ref1->u, v2 - v1 ); |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 692 | |
| 693 | p->u = u; |
| 694 | } |
| 695 | } |
| 696 | else |
| 697 | { |
| 698 | for ( p = p1; p <= p2; p++ ) |
| 699 | { |
| 700 | u = p->v; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 701 | |
| 702 | if ( u <= v2 ) |
| 703 | u += d2; |
| 704 | else if ( u >= v1 ) |
| 705 | u += d1; |
| 706 | else |
| 707 | u = ref1->u + FT_MulDiv( u - v1, ref2->u - ref1->u, v2 - v1 ); |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 708 | |
| 709 | p->u = u; |
| 710 | } |
| 711 | } |
| 712 | } |
| 713 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 714 | |
| 715 | /* interpolate weak points -- this is equivalent to the TrueType `IUP' */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 716 | static |
| 717 | void ah_hinter_align_weak_points( AH_Hinter* hinter ) |
| 718 | { |
| 719 | AH_Outline* outline = hinter->glyph; |
| 720 | FT_Int dimension; |
| 721 | AH_Edge* edges; |
| 722 | AH_Edge* edge_limit; |
| 723 | AH_Point* points; |
| 724 | AH_Point* point_limit; |
| 725 | AH_Point** contour_limit; |
| 726 | AH_Flags touch_flag; |
| 727 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 728 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 729 | points = outline->points; |
| 730 | point_limit = points + outline->num_points; |
| 731 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 732 | /* PASS 1: Move segment points to edge positions */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 733 | |
| 734 | edges = outline->horz_edges; |
| 735 | edge_limit = edges + outline->num_hedges; |
| 736 | touch_flag = ah_flah_touch_y; |
| 737 | |
| 738 | contour_limit = outline->contours + outline->num_contours; |
| 739 | |
| 740 | ah_setup_uv( outline, ah_uv_oy ); |
| 741 | |
| 742 | for ( dimension = 1; dimension >= 0; dimension-- ) |
| 743 | { |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 744 | AH_Point* point; |
| 745 | AH_Point* end_point; |
| 746 | AH_Point* first_point; |
| 747 | AH_Point** contour; |
| 748 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 749 | |
| 750 | point = points; |
| 751 | contour = outline->contours; |
| 752 | |
| 753 | for ( ; contour < contour_limit; contour++ ) |
| 754 | { |
| 755 | point = *contour; |
| 756 | end_point = point->prev; |
| 757 | first_point = point; |
| 758 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 759 | while ( point <= end_point && !( point->flags & touch_flag ) ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 760 | point++; |
| 761 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 762 | if ( point <= end_point ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 763 | { |
| 764 | AH_Point* first_touched = point; |
| 765 | AH_Point* cur_touched = point; |
| 766 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 767 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 768 | point++; |
| 769 | while ( point <= end_point ) |
| 770 | { |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 771 | if ( point->flags & touch_flag ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 772 | { |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 773 | /* we found two successive touched points; we interpolate */ |
| 774 | /* all contour points between them */ |
| 775 | ah_iup_interp( cur_touched + 1, point - 1, |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 776 | cur_touched, point ); |
| 777 | cur_touched = point; |
| 778 | } |
| 779 | point++; |
| 780 | } |
| 781 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 782 | if ( cur_touched == first_touched ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 783 | { |
| 784 | /* this is a special case: only one point was touched in the */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 785 | /* contour; we thus simply shift the whole contour */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 786 | ah_iup_shift( first_point, end_point, cur_touched ); |
| 787 | } |
| 788 | else |
| 789 | { |
| 790 | /* now interpolate after the last touched point to the end */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 791 | /* of the contour */ |
| 792 | ah_iup_interp( cur_touched + 1, end_point, |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 793 | cur_touched, first_touched ); |
| 794 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 795 | /* if the first contour point isn't touched, interpolate */ |
| 796 | /* from the contour start to the first touched point */ |
| 797 | if ( first_touched > points ) |
| 798 | ah_iup_interp( first_point, first_touched - 1, |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 799 | cur_touched, first_touched ); |
| 800 | } |
| 801 | } |
| 802 | } |
| 803 | |
| 804 | /* now save the interpolated values back to x/y */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 805 | if ( dimension ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 806 | { |
| 807 | for ( point = points; point < point_limit; point++ ) |
| 808 | point->y = point->u; |
| 809 | |
| 810 | touch_flag = ah_flah_touch_x; |
| 811 | ah_setup_uv( outline, ah_uv_ox ); |
| 812 | } |
| 813 | else |
| 814 | { |
| 815 | for ( point = points; point < point_limit; point++ ) |
| 816 | point->x = point->u; |
| 817 | |
| 818 | break; /* exit loop */ |
| 819 | } |
| 820 | } |
| 821 | } |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 822 | |
| 823 | #endif /* !AH_OPTION_NO_WEAK_INTERPOLATION */ |
| 824 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 825 | |
David Turner | 76a5f62 | 2000-11-04 01:55:49 +0000 | [diff] [blame] | 826 | FT_LOCAL_DEF |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 827 | void ah_hinter_align_points( AH_Hinter* hinter ) |
| 828 | { |
| 829 | ah_hinter_align_edge_points( hinter ); |
| 830 | |
| 831 | #ifndef AH_OPTION_NO_STRONG_INTERPOLATION |
| 832 | ah_hinter_align_strong_points( hinter ); |
| 833 | #endif |
| 834 | |
| 835 | #ifndef AH_OPTION_NO_WEAK_INTERPOLATION |
| 836 | ah_hinter_align_weak_points( hinter ); |
| 837 | #endif |
| 838 | } |
| 839 | |
| 840 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 841 | /*************************************************************************/ |
| 842 | /*************************************************************************/ |
| 843 | /*************************************************************************/ |
| 844 | /**** ****/ |
| 845 | /**** H I N T E R O B J E C T M E T H O D S ****/ |
| 846 | /**** ****/ |
| 847 | /*************************************************************************/ |
| 848 | /*************************************************************************/ |
| 849 | /*************************************************************************/ |
| 850 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 851 | |
| 852 | /* scale and fit the global metrics */ |
| 853 | static |
| 854 | void ah_hinter_scale_globals( AH_Hinter* hinter, |
| 855 | FT_Fixed x_scale, |
| 856 | FT_Fixed y_scale ) |
| 857 | { |
| 858 | FT_Int n; |
| 859 | AH_Face_Globals* globals = hinter->globals; |
| 860 | AH_Globals* design = &globals->design; |
| 861 | AH_Globals* scaled = &globals->scaled; |
| 862 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 863 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 864 | /* copy content */ |
| 865 | *scaled = *design; |
| 866 | |
| 867 | /* scale the standard widths & heights */ |
| 868 | for ( n = 0; n < design->num_widths; n++ ) |
| 869 | scaled->widths[n] = FT_MulFix( design->widths[n], x_scale ); |
| 870 | |
| 871 | for ( n = 0; n < design->num_heights; n++ ) |
| 872 | scaled->heights[n] = FT_MulFix( design->heights[n], y_scale ); |
| 873 | |
| 874 | /* scale the blue zones */ |
| 875 | for ( n = 0; n < ah_blue_max; n++ ) |
| 876 | { |
| 877 | FT_Pos delta, delta2; |
| 878 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 879 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 880 | delta = design->blue_shoots[n] - design->blue_refs[n]; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 881 | delta2 = delta; |
| 882 | if ( delta < 0 ) |
| 883 | delta2 = -delta2; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 884 | delta2 = FT_MulFix( delta2, y_scale ); |
| 885 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 886 | if ( delta2 < 32 ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 887 | delta2 = 0; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 888 | else if ( delta2 < 64 ) |
| 889 | delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & -32 ); |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 890 | else |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 891 | delta2 = ( delta2 + 32 ) & -64; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 892 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 893 | if ( delta < 0 ) |
| 894 | delta2 = -delta2; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 895 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 896 | scaled->blue_refs[n] = |
| 897 | ( FT_MulFix( design->blue_refs[n], y_scale ) + 32 ) & -64; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 898 | scaled->blue_shoots[n] = scaled->blue_refs[n] + delta2; |
| 899 | } |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 900 | |
David Turner | c49f69c | 2000-07-20 03:44:50 +0000 | [diff] [blame] | 901 | globals->x_scale = x_scale; |
| 902 | globals->y_scale = y_scale; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 903 | } |
| 904 | |
| 905 | |
| 906 | static |
| 907 | void ah_hinter_align( AH_Hinter* hinter ) |
| 908 | { |
| 909 | ah_hinter_align_edge_points( hinter ); |
| 910 | ah_hinter_align_points( hinter ); |
| 911 | } |
| 912 | |
| 913 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 914 | /* finalize a hinter object */ |
David Turner | 76a5f62 | 2000-11-04 01:55:49 +0000 | [diff] [blame] | 915 | FT_LOCAL_DEF |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 916 | void ah_hinter_done( AH_Hinter* hinter ) |
| 917 | { |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 918 | if ( hinter ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 919 | { |
| 920 | FT_Memory memory = hinter->memory; |
| 921 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 922 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 923 | ah_loader_done( hinter->loader ); |
| 924 | ah_outline_done( hinter->glyph ); |
| 925 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 926 | /* note: the `globals' pointer is _not_ owned by the hinter */ |
| 927 | /* but by the current face object, we don't need to */ |
| 928 | /* release it */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 929 | hinter->globals = 0; |
| 930 | hinter->face = 0; |
| 931 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 932 | FREE( hinter ); |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 933 | } |
| 934 | } |
| 935 | |
| 936 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 937 | /* create a new empty hinter object */ |
David Turner | 76a5f62 | 2000-11-04 01:55:49 +0000 | [diff] [blame] | 938 | FT_LOCAL_DEF |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 939 | FT_Error ah_hinter_new( FT_Library library, |
| 940 | AH_Hinter** ahinter ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 941 | { |
| 942 | AH_Hinter* hinter = 0; |
| 943 | FT_Memory memory = library->memory; |
| 944 | FT_Error error; |
| 945 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 946 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 947 | *ahinter = 0; |
| 948 | |
| 949 | /* allocate object */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 950 | if ( ALLOC( hinter, sizeof ( *hinter ) ) ) |
| 951 | goto Exit; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 952 | |
| 953 | hinter->memory = memory; |
| 954 | hinter->flags = 0; |
| 955 | |
| 956 | /* allocate outline and loader */ |
| 957 | error = ah_outline_new( memory, &hinter->glyph ) || |
| 958 | ah_loader_new ( memory, &hinter->loader ) || |
| 959 | ah_loader_create_extra( hinter->loader ); |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 960 | if ( error ) |
| 961 | goto Exit; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 962 | |
| 963 | *ahinter = hinter; |
| 964 | |
| 965 | Exit: |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 966 | if ( error ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 967 | ah_hinter_done( hinter ); |
| 968 | |
| 969 | return error; |
| 970 | } |
| 971 | |
| 972 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 973 | /* create a face's autohint globals */ |
David Turner | 76a5f62 | 2000-11-04 01:55:49 +0000 | [diff] [blame] | 974 | FT_LOCAL_DEF |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 975 | FT_Error ah_hinter_new_face_globals( AH_Hinter* hinter, |
| 976 | FT_Face face, |
| 977 | AH_Globals* globals ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 978 | { |
| 979 | FT_Error error; |
| 980 | FT_Memory memory = hinter->memory; |
| 981 | AH_Face_Globals* face_globals; |
| 982 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 983 | |
| 984 | if ( ALLOC( face_globals, sizeof ( *face_globals ) ) ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 985 | goto Exit; |
| 986 | |
| 987 | hinter->face = face; |
| 988 | hinter->globals = face_globals; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 989 | |
| 990 | if ( globals ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 991 | face_globals->design = *globals; |
| 992 | else |
| 993 | ah_hinter_compute_globals( hinter ); |
| 994 | |
| 995 | face->autohint.data = face_globals; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 996 | face->autohint.finalizer = (FT_Generic_Finalizer) |
| 997 | ah_hinter_done_face_globals; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 998 | face_globals->face = face; |
| 999 | |
| 1000 | Exit: |
| 1001 | return error; |
| 1002 | } |
| 1003 | |
| 1004 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1005 | /* discard a face's autohint globals */ |
David Turner | 76a5f62 | 2000-11-04 01:55:49 +0000 | [diff] [blame] | 1006 | FT_LOCAL_DEF |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1007 | void ah_hinter_done_face_globals( AH_Face_Globals* globals ) |
| 1008 | { |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1009 | FT_Face face = globals->face; |
| 1010 | FT_Memory memory = face->memory; |
| 1011 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1012 | |
| 1013 | FREE( globals ); |
| 1014 | } |
| 1015 | |
| 1016 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1017 | static |
| 1018 | FT_Error ah_hinter_load( AH_Hinter* hinter, |
| 1019 | FT_UInt glyph_index, |
| 1020 | FT_UInt load_flags, |
| 1021 | FT_UInt depth ) |
| 1022 | { |
| 1023 | FT_Face face = hinter->face; |
| 1024 | FT_GlyphSlot slot = face->glyph; |
| 1025 | FT_Fixed x_scale = face->size->metrics.x_scale; |
| 1026 | FT_Fixed y_scale = face->size->metrics.y_scale; |
| 1027 | FT_Glyph_Metrics metrics; /* temporary metrics */ |
| 1028 | FT_Error error; |
| 1029 | AH_Outline* outline = hinter->glyph; |
| 1030 | AH_Loader* gloader = hinter->loader; |
| 1031 | FT_Bool no_horz_hints = |
| 1032 | ( load_flags & AH_HINT_NO_HORZ_EDGES ) != 0; |
| 1033 | FT_Bool no_vert_hints = |
| 1034 | ( load_flags & AH_HINT_NO_VERT_EDGES ) != 0; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1035 | |
| 1036 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1037 | /* load the glyph */ |
| 1038 | error = FT_Load_Glyph( face, glyph_index, load_flags ); |
| 1039 | if ( error ) |
| 1040 | goto Exit; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1041 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1042 | /* save current glyph metrics */ |
| 1043 | metrics = slot->metrics; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1044 | |
David Turner | a6c747d | 2000-11-08 19:44:48 +0000 | [diff] [blame] | 1045 | /* set linear horizontal metrics */ |
| 1046 | slot->linearHoriAdvance = slot->metrics.horiAdvance; |
| 1047 | slot->linearVertAdvance = slot->metrics.vertAdvance; |
| 1048 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1049 | switch ( slot->format ) |
| 1050 | { |
| 1051 | case ft_glyph_format_outline: |
David Turner | e006675 | 2000-11-16 19:06:28 +0000 | [diff] [blame] | 1052 | |
| 1053 | /* translate glyph outline if we need to */ |
Werner Lemberg | 5c4f5eb | 2000-11-18 04:42:41 +0000 | [diff] [blame^] | 1054 | if ( hinter->transformed ) |
David Turner | e006675 | 2000-11-16 19:06:28 +0000 | [diff] [blame] | 1055 | { |
| 1056 | FT_UInt n = slot->outline.n_points; |
| 1057 | FT_Vector* point = slot->outline.points; |
| 1058 | |
Werner Lemberg | 5c4f5eb | 2000-11-18 04:42:41 +0000 | [diff] [blame^] | 1059 | |
David Turner | e006675 | 2000-11-16 19:06:28 +0000 | [diff] [blame] | 1060 | for ( ; n > 0; point++, n-- ) |
| 1061 | { |
| 1062 | point->x += hinter->trans_delta.x; |
| 1063 | point->y += hinter->trans_delta.y; |
| 1064 | } |
| 1065 | } |
| 1066 | |
| 1067 | /* copy the outline points in the loader's current */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1068 | /* extra points, which is used to keep original glyph coordinates */ |
| 1069 | error = ah_loader_check_points( gloader, slot->outline.n_points + 2, |
| 1070 | slot->outline.n_contours ); |
| 1071 | if ( error ) |
| 1072 | goto Exit; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1073 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1074 | MEM_Copy( gloader->current.extra_points, slot->outline.points, |
| 1075 | slot->outline.n_points * sizeof ( FT_Vector ) ); |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1076 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1077 | MEM_Copy( gloader->current.outline.contours, slot->outline.contours, |
| 1078 | slot->outline.n_contours * sizeof ( short ) ); |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1079 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1080 | MEM_Copy( gloader->current.outline.tags, slot->outline.tags, |
| 1081 | slot->outline.n_points * sizeof ( char ) ); |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1082 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1083 | gloader->current.outline.n_points = slot->outline.n_points; |
| 1084 | gloader->current.outline.n_contours = slot->outline.n_contours; |
| 1085 | |
| 1086 | /* compute original phantom points */ |
| 1087 | hinter->pp1.x = 0; |
| 1088 | hinter->pp1.y = 0; |
| 1089 | hinter->pp2.x = FT_MulFix( slot->metrics.horiAdvance, x_scale ); |
| 1090 | hinter->pp2.y = 0; |
| 1091 | |
| 1092 | /* be sure to check for spacing glyphs */ |
| 1093 | if ( slot->outline.n_points == 0 ) |
| 1094 | goto Hint_Metrics; |
| 1095 | |
| 1096 | /* now, load the slot image into the auto-outline, and run the */ |
| 1097 | /* automatic hinting process */ |
| 1098 | error = ah_outline_load( outline, face ); /* XXX: change to slot */ |
| 1099 | if ( error ) |
| 1100 | goto Exit; |
| 1101 | |
| 1102 | /* perform feature detection */ |
| 1103 | ah_outline_detect_features( outline ); |
| 1104 | |
| 1105 | if ( !no_horz_hints ) |
| 1106 | { |
| 1107 | ah_outline_compute_blue_edges( outline, hinter->globals ); |
| 1108 | ah_outline_scale_blue_edges( outline, hinter->globals ); |
| 1109 | } |
| 1110 | |
| 1111 | /* perform alignment control */ |
| 1112 | ah_hinter_hint_edges( hinter, no_horz_hints, no_vert_hints ); |
| 1113 | ah_hinter_align( hinter ); |
| 1114 | |
| 1115 | /* now save the current outline into the loader's current table */ |
| 1116 | ah_outline_save( outline, gloader ); |
| 1117 | |
| 1118 | /* we now need to hint the metrics according to the change in */ |
| 1119 | /* width/positioning that occured during the hinting process */ |
| 1120 | { |
| 1121 | FT_Pos old_width, new_width; |
| 1122 | FT_Pos old_advance, new_advance; |
| 1123 | FT_Pos old_lsb, new_lsb; |
| 1124 | AH_Edge* edge1 = outline->vert_edges; /* leftmost edge */ |
| 1125 | AH_Edge* edge2 = edge1 + |
| 1126 | outline->num_vedges - 1; /* rightmost edge */ |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1127 | |
| 1128 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1129 | old_width = edge2->opos - edge1->opos; |
| 1130 | new_width = edge2->pos - edge1->pos; |
| 1131 | |
| 1132 | old_advance = hinter->pp2.x; |
| 1133 | old_lsb = edge1->opos; |
| 1134 | new_lsb = edge1->pos; |
| 1135 | |
| 1136 | new_advance = old_advance + |
| 1137 | ( new_width + new_lsb - old_width - old_lsb ); |
| 1138 | |
| 1139 | hinter->pp1.x = ( ( new_lsb - old_lsb ) + 32 ) & -64; |
Werner Lemberg | e4b32a5 | 2000-10-31 20:42:18 +0000 | [diff] [blame] | 1140 | hinter->pp2.x = ( ( edge2->pos + |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1141 | ( old_advance - edge2->opos ) ) + 32 ) & -64; |
| 1142 | } |
| 1143 | |
| 1144 | /* good, we simply add the glyph to our loader's base */ |
| 1145 | ah_loader_add( gloader ); |
| 1146 | break; |
| 1147 | |
| 1148 | case ft_glyph_format_composite: |
| 1149 | { |
| 1150 | FT_UInt nn, num_subglyphs = slot->num_subglyphs; |
| 1151 | FT_UInt num_base_subgs, start_point, start_contour; |
| 1152 | FT_SubGlyph* subglyph; |
| 1153 | |
| 1154 | |
| 1155 | start_point = gloader->base.outline.n_points; |
| 1156 | start_contour = gloader->base.outline.n_contours; |
| 1157 | |
| 1158 | /* first of all, copy the subglyph descriptors in the glyph loader */ |
| 1159 | error = ah_loader_check_subglyphs( gloader, num_subglyphs ); |
| 1160 | if ( error ) |
| 1161 | goto Exit; |
| 1162 | |
| 1163 | MEM_Copy( gloader->current.subglyphs, slot->subglyphs, |
| 1164 | num_subglyphs * sizeof ( FT_SubGlyph ) ); |
| 1165 | |
| 1166 | gloader->current.num_subglyphs = num_subglyphs; |
| 1167 | num_base_subgs = gloader->base.num_subglyphs; |
| 1168 | |
| 1169 | /* now, read each subglyph independently */ |
| 1170 | for ( nn = 0; nn < num_subglyphs; nn++ ) |
| 1171 | { |
| 1172 | FT_Vector pp1, pp2; |
| 1173 | FT_Pos x, y; |
| 1174 | FT_UInt num_points, num_new_points, num_base_points; |
| 1175 | |
| 1176 | |
| 1177 | /* gloader.current.subglyphs can change during glyph loading due */ |
| 1178 | /* to re-allocation -- we must recompute the current subglyph on */ |
| 1179 | /* each iteration */ |
| 1180 | subglyph = gloader->base.subglyphs + num_base_subgs + nn; |
| 1181 | |
| 1182 | pp1 = hinter->pp1; |
| 1183 | pp2 = hinter->pp2; |
| 1184 | |
| 1185 | num_base_points = gloader->base.outline.n_points; |
| 1186 | |
| 1187 | error = ah_hinter_load( hinter, subglyph->index, |
| 1188 | load_flags, depth + 1 ); |
| 1189 | if ( error ) |
| 1190 | goto Exit; |
| 1191 | |
| 1192 | /* recompute subglyph pointer */ |
| 1193 | subglyph = gloader->base.subglyphs + num_base_subgs + nn; |
| 1194 | |
| 1195 | if ( subglyph->flags & FT_SUBGLYPH_FLAG_USE_MY_METRICS ) |
| 1196 | { |
| 1197 | pp1 = hinter->pp1; |
| 1198 | pp2 = hinter->pp2; |
| 1199 | } |
| 1200 | else |
| 1201 | { |
| 1202 | hinter->pp1 = pp1; |
| 1203 | hinter->pp2 = pp2; |
| 1204 | } |
| 1205 | |
| 1206 | num_points = gloader->base.outline.n_points; |
| 1207 | num_new_points = num_points - num_base_points; |
| 1208 | |
| 1209 | /* now perform the transform required for this subglyph */ |
| 1210 | |
| 1211 | if ( subglyph->flags & ( FT_SUBGLYPH_FLAG_SCALE | |
| 1212 | FT_SUBGLYPH_FLAG_XY_SCALE | |
| 1213 | FT_SUBGLYPH_FLAG_2X2 ) ) |
| 1214 | { |
| 1215 | FT_Vector* cur = gloader->base.outline.points + |
| 1216 | num_base_points; |
| 1217 | FT_Vector* org = gloader->base.extra_points + |
| 1218 | num_base_points; |
| 1219 | FT_Vector* limit = cur + num_new_points; |
| 1220 | |
| 1221 | |
| 1222 | for ( ; cur < limit; cur++, org++ ) |
| 1223 | { |
| 1224 | FT_Vector_Transform( cur, &subglyph->transform ); |
| 1225 | FT_Vector_Transform( org, &subglyph->transform ); |
| 1226 | } |
| 1227 | } |
| 1228 | |
| 1229 | /* apply offset */ |
| 1230 | |
| 1231 | if ( !( subglyph->flags & FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES ) ) |
| 1232 | { |
| 1233 | FT_Int k = subglyph->arg1; |
| 1234 | FT_UInt l = subglyph->arg2; |
| 1235 | FT_Vector* p1; |
| 1236 | FT_Vector* p2; |
| 1237 | |
| 1238 | |
| 1239 | if ( start_point + k >= num_base_points || |
| 1240 | l >= (FT_UInt)num_new_points ) |
| 1241 | { |
| 1242 | error = FT_Err_Invalid_Composite; |
| 1243 | goto Exit; |
| 1244 | } |
| 1245 | |
| 1246 | l += num_base_points; |
| 1247 | |
| 1248 | /* for now, only use the current point coordinates */ |
| 1249 | /* we may consider another approach in the near future */ |
| 1250 | p1 = gloader->base.outline.points + start_point + k; |
| 1251 | p2 = gloader->base.outline.points + start_point + l; |
| 1252 | |
| 1253 | x = p1->x - p2->x; |
| 1254 | y = p1->y - p2->y; |
| 1255 | } |
| 1256 | else |
| 1257 | { |
| 1258 | x = FT_MulFix( subglyph->arg1, x_scale ); |
| 1259 | y = FT_MulFix( subglyph->arg2, y_scale ); |
| 1260 | |
| 1261 | x = ( x + 32 ) & -64; |
| 1262 | y = ( y + 32 ) & -64; |
| 1263 | } |
| 1264 | |
| 1265 | { |
| 1266 | FT_Outline dummy = gloader->base.outline; |
| 1267 | |
| 1268 | |
| 1269 | dummy.points += num_base_points; |
| 1270 | dummy.n_points = num_new_points; |
| 1271 | |
| 1272 | FT_Outline_Translate( &dummy, x, y ); |
| 1273 | } |
| 1274 | } |
| 1275 | } |
| 1276 | break; |
| 1277 | |
| 1278 | default: |
| 1279 | /* we don't support other formats (yet?) */ |
| 1280 | error = FT_Err_Unimplemented_Feature; |
| 1281 | } |
| 1282 | |
| 1283 | Hint_Metrics: |
| 1284 | if ( depth == 0 ) |
| 1285 | { |
| 1286 | FT_BBox bbox; |
| 1287 | |
Werner Lemberg | 5c4f5eb | 2000-11-18 04:42:41 +0000 | [diff] [blame^] | 1288 | |
David Turner | e006675 | 2000-11-16 19:06:28 +0000 | [diff] [blame] | 1289 | /* transform the hinted outline if needed */ |
| 1290 | if ( hinter->transformed ) |
| 1291 | FT_Outline_Transform( &gloader->base.outline, &hinter->trans_matrix ); |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1292 | |
| 1293 | /* we must translate our final outline by -pp1.x, and compute */ |
| 1294 | /* the new metrics */ |
| 1295 | if ( hinter->pp1.x ) |
| 1296 | FT_Outline_Translate( &gloader->base.outline, -hinter->pp1.x, 0 ); |
| 1297 | |
| 1298 | FT_Outline_Get_CBox( &gloader->base.outline, &bbox ); |
| 1299 | bbox.xMin &= -64; |
| 1300 | bbox.yMin &= -64; |
| 1301 | bbox.xMax = ( bbox.xMax + 63 ) & -64; |
| 1302 | bbox.yMax = ( bbox.yMax + 63 ) & -64; |
| 1303 | |
| 1304 | slot->metrics.width = bbox.xMax - bbox.xMin; |
| 1305 | slot->metrics.height = bbox.yMax - bbox.yMin; |
| 1306 | slot->metrics.horiBearingX = bbox.xMin; |
| 1307 | slot->metrics.horiBearingY = bbox.yMax; |
| 1308 | slot->metrics.horiAdvance = hinter->pp2.x - hinter->pp1.x; |
| 1309 | /* XXX: TO DO - slot->linearHoriAdvance */ |
| 1310 | |
| 1311 | /* now copy outline into glyph slot */ |
David Turner | 54e7574 | 2000-11-04 02:52:02 +0000 | [diff] [blame] | 1312 | ah_loader_rewind( slot->internal->loader ); |
| 1313 | error = ah_loader_copy_points( slot->internal->loader, gloader ); |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1314 | if ( error ) |
| 1315 | goto Exit; |
| 1316 | |
David Turner | 54e7574 | 2000-11-04 02:52:02 +0000 | [diff] [blame] | 1317 | slot->outline = slot->internal->loader->base.outline; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1318 | slot->format = ft_glyph_format_outline; |
| 1319 | } |
| 1320 | |
| 1321 | Exit: |
| 1322 | return error; |
| 1323 | } |
| 1324 | |
| 1325 | |
| 1326 | /* load and hint a given glyph */ |
David Turner | 76a5f62 | 2000-11-04 01:55:49 +0000 | [diff] [blame] | 1327 | FT_LOCAL_DEF |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1328 | FT_Error ah_hinter_load_glyph( AH_Hinter* hinter, |
| 1329 | FT_GlyphSlot slot, |
| 1330 | FT_Size size, |
| 1331 | FT_UInt glyph_index, |
| 1332 | FT_Int load_flags ) |
| 1333 | { |
| 1334 | FT_Face face = slot->face; |
| 1335 | FT_Error error; |
| 1336 | FT_Fixed x_scale = size->metrics.x_scale; |
| 1337 | FT_Fixed y_scale = size->metrics.y_scale; |
| 1338 | AH_Face_Globals* face_globals = FACE_GLOBALS( face ); |
| 1339 | |
Werner Lemberg | 5c4f5eb | 2000-11-18 04:42:41 +0000 | [diff] [blame^] | 1340 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1341 | /* first of all, we need to check that we're using the correct face and */ |
| 1342 | /* global hints to load the glyph */ |
| 1343 | if ( hinter->face != face || hinter->globals != face_globals ) |
| 1344 | { |
| 1345 | hinter->face = face; |
| 1346 | if ( !face_globals ) |
| 1347 | { |
| 1348 | error = ah_hinter_new_face_globals( hinter, face, 0 ); |
| 1349 | if ( error ) |
| 1350 | goto Exit; |
| 1351 | } |
| 1352 | hinter->globals = FACE_GLOBALS( face ); |
| 1353 | face_globals = FACE_GLOBALS( face ); |
| 1354 | } |
| 1355 | |
| 1356 | /* now, we must check the current character pixel size to see if we */ |
| 1357 | /* need to rescale the global metrics */ |
| 1358 | if ( face_globals->x_scale != x_scale || |
| 1359 | face_globals->y_scale != y_scale ) |
| 1360 | ah_hinter_scale_globals( hinter, x_scale, y_scale ); |
| 1361 | |
| 1362 | load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_RECURSE; |
| 1363 | |
| 1364 | ah_loader_rewind( hinter->loader ); |
| 1365 | |
David Turner | e006675 | 2000-11-16 19:06:28 +0000 | [diff] [blame] | 1366 | { |
| 1367 | FT_Slot_Internal internal = slot->internal; |
| 1368 | |
Werner Lemberg | 5c4f5eb | 2000-11-18 04:42:41 +0000 | [diff] [blame^] | 1369 | |
David Turner | e006675 | 2000-11-16 19:06:28 +0000 | [diff] [blame] | 1370 | hinter->transformed = internal->glyph_transformed; |
Werner Lemberg | 5c4f5eb | 2000-11-18 04:42:41 +0000 | [diff] [blame^] | 1371 | if ( hinter->transformed ) |
David Turner | e006675 | 2000-11-16 19:06:28 +0000 | [diff] [blame] | 1372 | { |
| 1373 | FT_Matrix imatrix; |
| 1374 | |
Werner Lemberg | 5c4f5eb | 2000-11-18 04:42:41 +0000 | [diff] [blame^] | 1375 | |
David Turner | e006675 | 2000-11-16 19:06:28 +0000 | [diff] [blame] | 1376 | imatrix = internal->glyph_matrix; |
| 1377 | hinter->trans_delta = internal->glyph_delta; |
| 1378 | hinter->trans_matrix = imatrix; |
| 1379 | |
| 1380 | FT_Matrix_Invert( &imatrix ); |
| 1381 | FT_Vector_Transform( &hinter->trans_delta, &imatrix ); |
| 1382 | } |
| 1383 | } |
| 1384 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1385 | error = ah_hinter_load( hinter, glyph_index, load_flags, 0 ); |
| 1386 | |
| 1387 | Exit: |
| 1388 | return error; |
| 1389 | } |
| 1390 | |
| 1391 | |
| 1392 | /* retrieve a face's autohint globals for client applications */ |
David Turner | 76a5f62 | 2000-11-04 01:55:49 +0000 | [diff] [blame] | 1393 | FT_LOCAL_DEF |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1394 | void ah_hinter_get_global_hints( AH_Hinter* hinter, |
| 1395 | FT_Face face, |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1396 | void** global_hints, |
| 1397 | long* global_len ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1398 | { |
| 1399 | AH_Globals* globals = 0; |
| 1400 | FT_Memory memory = hinter->memory; |
| 1401 | FT_Error error; |
| 1402 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1403 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1404 | /* allocate new master globals */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1405 | if ( ALLOC( globals, sizeof ( *globals ) ) ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1406 | goto Fail; |
| 1407 | |
| 1408 | /* compute face globals if needed */ |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1409 | if ( !FACE_GLOBALS( face ) ) |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1410 | { |
| 1411 | error = ah_hinter_new_face_globals( hinter, face, 0 ); |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1412 | if ( error ) |
| 1413 | goto Fail; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1414 | } |
| 1415 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1416 | *globals = FACE_GLOBALS( face )->design; |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1417 | *global_hints = globals; |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1418 | *global_len = sizeof( *globals ); |
| 1419 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1420 | return; |
| 1421 | |
| 1422 | Fail: |
| 1423 | FREE( globals ); |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1424 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1425 | *global_hints = 0; |
| 1426 | *global_len = 0; |
| 1427 | } |
| 1428 | |
| 1429 | |
David Turner | 76a5f62 | 2000-11-04 01:55:49 +0000 | [diff] [blame] | 1430 | FT_LOCAL_DEF |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1431 | void ah_hinter_done_global_hints( AH_Hinter* hinter, |
| 1432 | void* global_hints ) |
| 1433 | { |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1434 | FT_Memory memory = hinter->memory; |
| 1435 | |
| 1436 | |
David Turner | 3469d0d | 2000-07-19 20:02:14 +0000 | [diff] [blame] | 1437 | FREE( global_hints ); |
| 1438 | } |
| 1439 | |
| 1440 | |
Werner Lemberg | c3dd151 | 2000-07-26 14:11:15 +0000 | [diff] [blame] | 1441 | /* END */ |