| 1 | /* Copyright (C) 1989, 1992 Aladdin Enterprises. All rights reserved. |
| 2 | Distributed by Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of Ghostscript. |
| 5 | |
| 6 | Ghostscript is distributed in the hope that it will be useful, but |
| 7 | WITHOUT ANY WARRANTY. No author or distributor accepts responsibility |
| 8 | to anyone for the consequences of using it or for whether it serves any |
| 9 | particular purpose or works at all, unless he says so in writing. Refer |
| 10 | to the Ghostscript General Public License for full details. |
| 11 | |
| 12 | Everyone is granted permission to copy, modify and redistribute |
| 13 | Ghostscript, but only under the conditions described in the Ghostscript |
| 14 | General Public License. A copy of this license is supposed to have been |
| 15 | given to you along with Ghostscript so you can know your rights and |
| 16 | responsibilities. It should be in a file named COPYING. Among other |
| 17 | things, the copyright notice and this notice must be preserved on all |
| 18 | copies. */ |
| 19 | |
| 20 | /* gschar.c */ |
| 21 | /* Character writing operators for Ghostscript library */ |
| 22 | #include "gx.h" |
| 23 | #include "memory_.h" |
| 24 | #include "string_.h" |
| 25 | #include "gserrors.h" |
| 26 | #include "gxfixed.h" /* ditto */ |
| 27 | #include "gxarith.h" |
| 28 | #include "gxmatrix.h" |
| 29 | #include "gzstate.h" /* must precede gzdevice */ |
| 30 | #include "gzdevice.h" /* must precede gxchar */ |
| 31 | #include "gxdevmem.h" |
| 32 | #include "gxchar.h" |
| 33 | #include "gxcache.h" |
| 34 | #include "gxfont.h" |
| 35 | #include "gspath.h" |
| 36 | #include "gzpath.h" |
| 37 | #include "gzcolor.h" |
| 38 | |
| 39 | /* Exported size of enumerator */ |
| 40 | const uint gs_show_enum_sizeof = sizeof(gs_show_enum); |
| 41 | |
| 42 | /* Imported procedures */ |
| 43 | extern void gx_set_black(P1(gs_state *)); |
| 44 | |
| 45 | /* Forward declarations */ |
| 46 | private int continue_show(P1(gs_show_enum *)); |
| 47 | private int continue_show_update(P1(gs_show_enum *)); |
| 48 | private int show_setup(P3(gs_show_enum *, gs_state *, char *)); |
| 49 | private int stringwidth_setup(P3(gs_show_enum *, gs_state *, char *)); |
| 50 | |
| 51 | /* Print the ctm if debugging */ |
| 52 | #define print_ctm(s,pgs)\ |
| 53 | dprintf7("[p]%sctm=[%g %g %g %g %g %g]\n", s,\ |
| 54 | pgs->ctm.xx, pgs->ctm.xy, pgs->ctm.yx, pgs->ctm.yy,\ |
| 55 | pgs->ctm.tx, pgs->ctm.ty) |
| 56 | |
| 57 | /* ------ String writing operators ------ */ |
| 58 | |
| 59 | /* Setup macros for show operators */ |
| 60 | #define setup_show()\ |
| 61 | penum->size = strlen(str) |
| 62 | #define setup_show_n()\ |
| 63 | penum->size = size |
| 64 | #define setup_a()\ |
| 65 | penum->add = 1, penum->ax = ax, penum->ay = ay,\ |
| 66 | penum->slow_show = 1 |
| 67 | #define setup_width()\ |
| 68 | penum->wchr = chr, penum->wcx = cx, penum->wcy = cy,\ |
| 69 | penum->slow_show = 1 |
| 70 | #define no_chr ~(char_code)0 |
| 71 | |
| 72 | /* show[_n] */ |
| 73 | int |
| 74 | gs_show_init(register gs_show_enum *penum, |
| 75 | gs_state *pgs, char *str) |
| 76 | { setup_show(); |
| 77 | penum->slow_show = 0; |
| 78 | return show_setup(penum, pgs, str); |
| 79 | } |
| 80 | int |
| 81 | gs_show_n_init(register gs_show_enum *penum, |
| 82 | gs_state *pgs, char *str, uint size) |
| 83 | { setup_show_n(); |
| 84 | penum->slow_show = 0; |
| 85 | return show_setup(penum, pgs, str); |
| 86 | } |
| 87 | |
| 88 | /* ashow[_n] */ |
| 89 | int |
| 90 | gs_ashow_init(register gs_show_enum *penum, |
| 91 | gs_state *pgs, floatp ax, floatp ay, char *str) |
| 92 | { int code; |
| 93 | setup_show(); |
| 94 | code = show_setup(penum, pgs, str); |
| 95 | setup_a(); |
| 96 | return code; |
| 97 | } |
| 98 | int |
| 99 | gs_ashow_n_init(register gs_show_enum *penum, |
| 100 | gs_state *pgs, floatp ax, floatp ay, char *str, uint size) |
| 101 | { int code; |
| 102 | setup_show_n(); |
| 103 | code = show_setup(penum, pgs, str); |
| 104 | setup_a(); |
| 105 | return code; |
| 106 | } |
| 107 | |
| 108 | /* widthshow[_n] */ |
| 109 | int |
| 110 | gs_widthshow_init(register gs_show_enum *penum, |
| 111 | gs_state *pgs, floatp cx, floatp cy, char chr, char *str) |
| 112 | { int code; |
| 113 | setup_show(); |
| 114 | code = show_setup(penum, pgs, str); |
| 115 | setup_width(); |
| 116 | return code; |
| 117 | } |
| 118 | int |
| 119 | gs_widthshow_n_init(register gs_show_enum *penum, |
| 120 | gs_state *pgs, floatp cx, floatp cy, char chr, char *str, uint size) |
| 121 | { int code; |
| 122 | setup_show_n(); |
| 123 | code = show_setup(penum, pgs, str); |
| 124 | setup_width(); |
| 125 | return code; |
| 126 | } |
| 127 | |
| 128 | /* awidthshow[_n] */ |
| 129 | int |
| 130 | gs_awidthshow_init(register gs_show_enum *penum, |
| 131 | gs_state *pgs, floatp cx, floatp cy, char chr, floatp ax, floatp ay, |
| 132 | char *str) |
| 133 | { int code; |
| 134 | setup_show(); |
| 135 | code = show_setup(penum, pgs, str); |
| 136 | setup_a(); |
| 137 | setup_width(); |
| 138 | return code; |
| 139 | } |
| 140 | int |
| 141 | gs_awidthshow_n_init(register gs_show_enum *penum, |
| 142 | gs_state *pgs, floatp cx, floatp cy, char chr, floatp ax, floatp ay, |
| 143 | char *str, uint size) |
| 144 | { int code; |
| 145 | setup_show_n(); |
| 146 | code = show_setup(penum, pgs, str); |
| 147 | setup_a(); |
| 148 | setup_width(); |
| 149 | return code; |
| 150 | } |
| 151 | |
| 152 | /* kshow[_n] */ |
| 153 | int |
| 154 | gs_kshow_init(register gs_show_enum *penum, |
| 155 | gs_state *pgs, char *str) |
| 156 | { int code; |
| 157 | if ( pgs->font->FontType == ft_composite) |
| 158 | return_error(gs_error_invalidfont); |
| 159 | setup_show(); |
| 160 | code = show_setup(penum, pgs, str); |
| 161 | penum->do_kern = penum->slow_show = 1; |
| 162 | return code; |
| 163 | } |
| 164 | int |
| 165 | gs_kshow_n_init(register gs_show_enum *penum, |
| 166 | gs_state *pgs, char *str, uint size) |
| 167 | { int code; |
| 168 | if ( pgs->font->FontType == ft_composite) |
| 169 | return_error(gs_error_invalidfont); |
| 170 | setup_show_n(); |
| 171 | code = show_setup(penum, pgs, str); |
| 172 | penum->do_kern = penum->slow_show = 1; |
| 173 | return code; |
| 174 | } |
| 175 | |
| 176 | /* ------ Related operators ------ */ |
| 177 | |
| 178 | /* stringwidth[_n] */ |
| 179 | int |
| 180 | gs_stringwidth_init(gs_show_enum *penum, gs_state *pgs, char *str) |
| 181 | { setup_show(); |
| 182 | return stringwidth_setup(penum, pgs, str); |
| 183 | } |
| 184 | int |
| 185 | gs_stringwidth_n_init(gs_show_enum *penum, gs_state *pgs, char *str, uint size) |
| 186 | { setup_show_n(); |
| 187 | return stringwidth_setup(penum, pgs, str); |
| 188 | } |
| 189 | |
| 190 | /* Common code for stringwidth[_n] */ |
| 191 | private int |
| 192 | stringwidth_setup(gs_show_enum *penum, gs_state *pgs, char *str) |
| 193 | { int code = show_setup(penum, pgs, str); |
| 194 | if ( code < 0 ) return_error(code); |
| 195 | penum->stringwidth_flag = 1; |
| 196 | /* Do an extra gsave and suppress output */ |
| 197 | if ( (code = gs_gsave(pgs)) < 0 ) return code; |
| 198 | penum->level = pgs->level; /* for level check in show_update */ |
| 199 | gx_device_no_output(pgs); |
| 200 | /* Establish an arbitrary current point. */ |
| 201 | return gx_path_add_point(pgs->path, pgs->ctm.tx_fixed, pgs->ctm.ty_fixed); |
| 202 | } |
| 203 | |
| 204 | /* charpath[_n] */ |
| 205 | int |
| 206 | gs_charpath_init(gs_show_enum *penum, gs_state *pgs, |
| 207 | char *str, int bool) |
| 208 | { int code; |
| 209 | setup_show(); |
| 210 | code = show_setup(penum, pgs, str); |
| 211 | penum->charpath_flag = (bool ? 2 : 1); |
| 212 | penum->can_cache = 0; |
| 213 | return code; |
| 214 | } |
| 215 | int |
| 216 | gs_charpath_n_init(gs_show_enum *penum, gs_state *pgs, |
| 217 | char *str, uint size, int bool) |
| 218 | { int code; |
| 219 | setup_show_n(); |
| 220 | code = show_setup(penum, pgs, str); |
| 221 | penum->charpath_flag = (bool ? 2 : 1); |
| 222 | penum->can_cache = 0; |
| 223 | return code; |
| 224 | } |
| 225 | |
| 226 | /* ------ Width/cache operators ------ */ |
| 227 | |
| 228 | /* setcachedevice */ |
| 229 | int |
| 230 | gs_setcachedevice(register gs_show_enum *penum, gs_state *pgs, |
| 231 | floatp wx, floatp wy, floatp llx, floatp lly, floatp urx, floatp ury) |
| 232 | { int code = gs_setcharwidth(penum, pgs, wx, wy); /* default is don't cache */ |
| 233 | if ( code < 0 ) return code; |
| 234 | /* See if we want to cache this character. */ |
| 235 | if ( pgs->in_cachedevice ) /* no recursion! */ |
| 236 | return 0; |
| 237 | pgs->in_cachedevice = 1; /* disable color/gray/image operators */ |
| 238 | /* We can only use the cache if ctm is unchanged */ |
| 239 | /* (aside from a possible translation), */ |
| 240 | /* and if the extent of the box is non-negative. */ |
| 241 | if ( !penum->can_cache || !pgs->char_tm_valid || |
| 242 | llx > urx || lly > ury |
| 243 | ) |
| 244 | return 0; |
| 245 | { gs_font_dir *dir = pgs->font->dir; |
| 246 | gs_fixed_point cbox_ll, cbox_ur, cdim; |
| 247 | long iwidth, iheight; |
| 248 | cached_char *cc; |
| 249 | gs_fixed_rect clip_box; |
| 250 | gs_distance_transform2fixed(&pgs->ctm, llx, lly, &cbox_ll); |
| 251 | gs_distance_transform2fixed(&pgs->ctm, urx, ury, &cbox_ur); |
| 252 | cdim.x = cbox_ur.x - cbox_ll.x; |
| 253 | cdim.y = cbox_ur.y - cbox_ll.y; |
| 254 | if ( cdim.x < 0 ) cdim.x = -cdim.x; |
| 255 | if ( cdim.y < 0 ) cdim.y = -cdim.y; |
| 256 | #ifdef DEBUG |
| 257 | if ( gs_debug['k'] ) |
| 258 | { dprintf4("[k]cbox=[%g %g %g %g]\n", |
| 259 | fixed2float(cbox_ll.x), fixed2float(cbox_ll.y), |
| 260 | fixed2float(cbox_ur.x), fixed2float(cbox_ur.y)); |
| 261 | print_ctm(" ", pgs); |
| 262 | } |
| 263 | #endif |
| 264 | iwidth = fixed2long(cdim.x) + 2; |
| 265 | iheight = fixed2long(cdim.y) + 2; |
| 266 | if ( iwidth != (ushort)iwidth || |
| 267 | iheight != (ushort)iheight |
| 268 | ) |
| 269 | return 0; /* much too big */ |
| 270 | if ( !penum->dev_cache_set ) |
| 271 | { /* Set up the memory device for the character cache */ |
| 272 | device *dev = &penum->dev_cache_dev; |
| 273 | penum->dev_cache_info = mem_mono_device; |
| 274 | dev->info = (gx_device *)&penum->dev_cache_info; |
| 275 | dev->is_band_device = 0; |
| 276 | dev->white = 1; |
| 277 | dev->black = 1; |
| 278 | penum->dev_cache_set = 1; |
| 279 | } |
| 280 | if ( (cc = gx_alloc_char_bits(dir, |
| 281 | (gx_device_memory *)&penum->dev_cache_info, |
| 282 | (ushort)iwidth, |
| 283 | (ushort)iheight)) == 0 ) |
| 284 | return 0; /* too big for cache */ |
| 285 | /* The mins handle transposed coordinate systems.... */ |
| 286 | /* Truncate the offsets to avoid artifacts later. */ |
| 287 | cc->offset.x = fixed_ceiling(-min(cbox_ll.x, cbox_ur.x)); |
| 288 | cc->offset.y = fixed_ceiling(-min(cbox_ll.y, cbox_ur.y)); |
| 289 | #ifdef DEBUG |
| 290 | if ( gs_debug['k'] ) |
| 291 | dprintf2("[k]offset=[%g %g]\n", fixed2float(cc->offset.x), |
| 292 | fixed2float(cc->offset.y)); |
| 293 | #endif |
| 294 | if ( !color_is_pure(pgs->dev_color) ) /* can't use cache */ |
| 295 | { gx_free_cached_char(dir, cc); |
| 296 | return code; |
| 297 | } |
| 298 | if ( (code = gs_gsave(pgs)) < 0 ) |
| 299 | { gx_free_cached_char(dir, cc); |
| 300 | return code; |
| 301 | } |
| 302 | /* Nothing can go wrong now.... */ |
| 303 | penum->cc = cc; |
| 304 | cc->code = gs_show_current_char(penum); |
| 305 | cc->wxy = penum->wxy; |
| 306 | /* Install the device */ |
| 307 | pgs->device = &penum->dev_cache_dev; |
| 308 | pgs->device_is_shared = 1; /* don't deallocate */ |
| 309 | /* Adjust the translation in the graphics context */ |
| 310 | /* so that the character lines up with the cache. */ |
| 311 | gs_translate_to_fixed(pgs, cc->offset.x, cc->offset.y); |
| 312 | /* Reset the clipping path to match the metrics. */ |
| 313 | clip_box.p.x = clip_box.p.y = 0; |
| 314 | clip_box.q.x = int2fixed(iwidth); |
| 315 | clip_box.q.y = int2fixed(iheight); |
| 316 | if ( (code = gx_clip_to_rectangle(pgs, &clip_box)) < 0 ) |
| 317 | return code; |
| 318 | gx_set_black(pgs); /* Set the color to black. */ |
| 319 | } |
| 320 | penum->width_status = sws_cache; |
| 321 | return 0; |
| 322 | } |
| 323 | |
| 324 | /* setcharwidth */ |
| 325 | int |
| 326 | gs_setcharwidth(register gs_show_enum *penum, gs_state *pgs, floatp wx, floatp wy) |
| 327 | { if ( penum->width_status != sws_none ) |
| 328 | return_error(gs_error_undefined); |
| 329 | gs_distance_transform2fixed(&pgs->ctm, wx, wy, &penum->wxy); |
| 330 | penum->width_status = sws_no_cache; |
| 331 | return 0; |
| 332 | } |
| 333 | |
| 334 | /* setmetrics */ |
| 335 | int |
| 336 | gs_setmetrics(register gs_show_enum *penum, gs_state *pgs, |
| 337 | gs_point *psbxy, gs_point *pwxy) |
| 338 | { if ( penum->width_status != sws_none ) |
| 339 | return_error(gs_error_undefined); |
| 340 | if ( psbxy != 0 ) |
| 341 | { penum->metrics_sb.x = float2fixed(psbxy->x); |
| 342 | penum->metrics_sb.y = float2fixed(psbxy->y); |
| 343 | penum->sb_set = 1; |
| 344 | } |
| 345 | if ( pwxy != 0 ) |
| 346 | { penum->metrics_width.x = float2fixed(pwxy->x); |
| 347 | penum->metrics_width.y = float2fixed(pwxy->y); |
| 348 | penum->width_set = 1; |
| 349 | } |
| 350 | return 0; |
| 351 | } |
| 352 | |
| 353 | /* ------ Enumerator ------ */ |
| 354 | |
| 355 | /* Do the next step of a show (or stringwidth) operation */ |
| 356 | int |
| 357 | gs_show_next(gs_show_enum *penum) |
| 358 | { return (*penum->continue_proc)(penum); |
| 359 | } |
| 360 | |
| 361 | /* Continuation procedures */ |
| 362 | #define show_fast_move(wxy, pgs)\ |
| 363 | gx_path_add_rel_point_inline(pgs->path, wxy.x, wxy.y) |
| 364 | private int show_update(P1(register gs_show_enum *penum)); |
| 365 | private int show_move(P1(register gs_show_enum *penum)); |
| 366 | private int show_proceed(P1(register gs_show_enum *penum)); |
| 367 | private int show_finish(P1(register gs_show_enum *penum)); |
| 368 | private int |
| 369 | continue_show_update(register gs_show_enum *penum) |
| 370 | { int code = show_update(penum); |
| 371 | if ( code < 0 ) return code; |
| 372 | code = show_move(penum); |
| 373 | if ( code != 0 ) return code; |
| 374 | return show_proceed(penum); |
| 375 | } |
| 376 | private int |
| 377 | continue_show(register gs_show_enum *penum) |
| 378 | { return show_proceed(penum); |
| 379 | } |
| 380 | |
| 381 | /* Update position */ |
| 382 | private int |
| 383 | show_update(register gs_show_enum *penum) |
| 384 | { register gs_state *pgs = penum->pgs; |
| 385 | /* Update position for last character */ |
| 386 | switch ( penum->width_status ) |
| 387 | { |
| 388 | case sws_none: |
| 389 | /* Adobe interpreters assume a character width of 0, */ |
| 390 | /* even though the documentation says this is an error.... */ |
| 391 | penum->wxy.x = penum->wxy.y = 0; |
| 392 | break; |
| 393 | case sws_cache: |
| 394 | { /* Finish installing the cache entry. */ |
| 395 | cached_char *cc = penum->cc; |
| 396 | int code; |
| 397 | /* If the BuildChar procedure did a save and a restore, */ |
| 398 | /* it already undid the gsave in setcachedevice. */ |
| 399 | /* We have to check for this by comparing levels. */ |
| 400 | switch ( pgs->level - penum->level ) |
| 401 | { |
| 402 | default: |
| 403 | return_error(gs_error_invalidfont); /* WRONG */ |
| 404 | case 2: |
| 405 | code = gs_grestore(pgs); |
| 406 | if ( code < 0 ) return code; |
| 407 | case 1: |
| 408 | ; |
| 409 | } |
| 410 | gx_add_cached_char(pgs->font->dir, &penum->dev_cache_info, |
| 411 | cc, gx_lookup_fm_pair(pgs)); |
| 412 | if ( !penum->stringwidth_flag && !penum->charpath_flag ) |
| 413 | { /* Copy the bits to the real output device. */ |
| 414 | penum->color_loaded = 0; /* force gx_color_render */ |
| 415 | code = gs_grestore(pgs); |
| 416 | if ( code < 0 ) return code; |
| 417 | return gx_image_cached_char(penum, cc); |
| 418 | } |
| 419 | } |
| 420 | case sws_no_cache: ; |
| 421 | } |
| 422 | return gs_grestore(pgs); |
| 423 | } |
| 424 | |
| 425 | /* Move to next character */ |
| 426 | private int |
| 427 | show_move(register gs_show_enum *penum) |
| 428 | { register gs_state *pgs = penum->pgs; |
| 429 | if ( penum->add ) |
| 430 | gs_rmoveto(pgs, penum->ax, penum->ay); |
| 431 | if ( penum->str[penum->index - 1] == penum->wchr ) |
| 432 | gs_rmoveto(pgs, penum->wcx, penum->wcy); |
| 433 | /* wxy is in device coordinates */ |
| 434 | { int code = show_fast_move(penum->wxy, pgs); |
| 435 | if ( code < 0 ) return code; |
| 436 | } |
| 437 | /* Check for kerning, but not on the last character. */ |
| 438 | if ( penum->do_kern && penum->index < penum->size ) |
| 439 | { penum->continue_proc = continue_show; |
| 440 | return gs_show_kern; |
| 441 | } |
| 442 | return 0; |
| 443 | } |
| 444 | /* Process next character */ |
| 445 | private int |
| 446 | show_proceed(register gs_show_enum *penum) |
| 447 | { register gs_state *pgs = penum->pgs; |
| 448 | byte *str = penum->str; |
| 449 | uint index; |
| 450 | cached_fm_pair *pair = 0; |
| 451 | char_code chr; |
| 452 | int code; |
| 453 | penum->color_loaded = 0; |
| 454 | more: /* Proceed to next character */ |
| 455 | if ( penum->can_cache ) |
| 456 | { /* Loop with cache */ |
| 457 | if ( pair == 0 ) |
| 458 | pair = gx_lookup_fm_pair(pgs); |
| 459 | if ( penum->stringwidth_flag ) |
| 460 | while ( (index = penum->index++) != penum->size ) |
| 461 | { cached_char *cc; |
| 462 | chr = str[index]; |
| 463 | cc = gx_lookup_cached_char(pgs, pair, chr); |
| 464 | if ( cc == 0 ) goto no_cache; |
| 465 | /* Character is in cache. */ |
| 466 | code = show_fast_move(cc->wxy, pgs); |
| 467 | if ( code ) return code; |
| 468 | } |
| 469 | else |
| 470 | while ( (index = penum->index++) != penum->size ) |
| 471 | { cached_char *cc; |
| 472 | chr = str[index]; |
| 473 | cc = gx_lookup_cached_char(pgs, pair, chr); |
| 474 | if ( cc == 0 ) goto no_cache; |
| 475 | /* Character is in cache. */ |
| 476 | code = gx_image_cached_char(penum, cc); |
| 477 | if ( code < 0 ) return code; |
| 478 | else if ( code > 0 ) goto no_cache; |
| 479 | if ( penum->slow_show ) |
| 480 | { penum->wxy = cc->wxy; |
| 481 | code = show_move(penum); |
| 482 | } |
| 483 | else |
| 484 | code = show_fast_move(cc->wxy, pgs); |
| 485 | if ( code ) return code; |
| 486 | } |
| 487 | /* All done. */ |
| 488 | return show_finish(penum); |
| 489 | } |
| 490 | else |
| 491 | { /* Can't use cache */ |
| 492 | if ( (index = penum->index++) == penum->size ) |
| 493 | { /* All done. */ |
| 494 | return show_finish(penum); |
| 495 | } |
| 496 | chr = str[index]; |
| 497 | } |
| 498 | no_cache: |
| 499 | /* Character is not cached, client must render it. */ |
| 500 | if ( (code = gs_gsave(pgs)) < 0 ) return code; |
| 501 | /* Set the charpath flag in the graphics context if necessary, */ |
| 502 | /* so that fill and stroke will add to the path */ |
| 503 | /* rather than having their usual effect. */ |
| 504 | pgs->in_charpath = penum->charpath_flag; |
| 505 | { gs_fixed_point cpt; |
| 506 | gx_path *ppath = pgs->path; |
| 507 | if ( (code = gx_path_current_point_inline(ppath, &cpt)) < 0 ) |
| 508 | return code; |
| 509 | cpt.x -= pgs->ctm.tx_fixed; |
| 510 | cpt.y -= pgs->ctm.ty_fixed; |
| 511 | gs_setmatrix(pgs, &pgs->char_tm); |
| 512 | cpt.x += pgs->ctm.tx_fixed; |
| 513 | cpt.y += pgs->ctm.ty_fixed; |
| 514 | if ( !penum->stringwidth_flag && !penum->charpath_flag ) |
| 515 | { /* Round the translation in the graphics state. */ |
| 516 | /* This helps prevent rounding artifacts later. */ |
| 517 | cpt.x = fixed_rounded(cpt.x); |
| 518 | cpt.y = fixed_rounded(cpt.y); |
| 519 | } |
| 520 | gs_translate_to_fixed(pgs, cpt.x, cpt.y); |
| 521 | gs_newpath(pgs); |
| 522 | gx_path_add_point(ppath, pgs->ctm.tx_fixed, |
| 523 | pgs->ctm.ty_fixed); |
| 524 | } |
| 525 | penum->width_status = sws_none; |
| 526 | penum->width_set = penum->sb_set = 0; |
| 527 | penum->continue_proc = continue_show_update; |
| 528 | /* Try using the build procedure in the font. */ |
| 529 | /* < 0 means error, 0 means success, 1 means failure. */ |
| 530 | { gs_font *pfont = pgs->font; |
| 531 | code = (*pfont->build_char_proc)(penum, pgs, pfont, chr, pfont->build_char_data); |
| 532 | if ( code < 0 ) return_error(code); |
| 533 | if ( code == 0 ) |
| 534 | { code = show_update(penum); |
| 535 | if ( code < 0 ) return code; |
| 536 | penum->color_loaded = 0; |
| 537 | code = show_move(penum); |
| 538 | if ( code ) return code; |
| 539 | goto more; |
| 540 | } |
| 541 | } |
| 542 | return gs_show_render; |
| 543 | } |
| 544 | |
| 545 | /* Finish show or stringwidth */ |
| 546 | private int |
| 547 | show_finish(register gs_show_enum *penum) |
| 548 | { register gs_state *pgs = penum->pgs; |
| 549 | int code; |
| 550 | if ( !penum->stringwidth_flag ) return 0; |
| 551 | /* Save the accumulated width before returning, */ |
| 552 | /* and undo the extra gsave. */ |
| 553 | code = gs_currentpoint(pgs, &penum->width); |
| 554 | if ( code < 0 ) return code; |
| 555 | return gs_grestore(pgs); |
| 556 | } |
| 557 | |
| 558 | /* Return the current character for rendering. */ |
| 559 | char_code |
| 560 | gs_show_current_char(gs_show_enum *penum) |
| 561 | { return penum->str[penum->index - 1]; |
| 562 | } |
| 563 | |
| 564 | /* Return the just-displayed character for kerning. */ |
| 565 | char_code |
| 566 | gs_kshow_previous_char(gs_show_enum *penum) |
| 567 | { return penum->str[penum->index - 1]; |
| 568 | } |
| 569 | |
| 570 | /* Return the about-to-be-displayed character for kerning. */ |
| 571 | char_code |
| 572 | gs_kshow_next_char(gs_show_enum *penum) |
| 573 | { return penum->str[penum->index]; |
| 574 | } |
| 575 | |
| 576 | /* Return the accumulated width for stringwidth. */ |
| 577 | void |
| 578 | gs_show_width(gs_show_enum *penum, gs_point *ppt) |
| 579 | { *ppt = penum->width; |
| 580 | } |
| 581 | |
| 582 | /* Return the charpath flag. */ |
| 583 | int |
| 584 | gs_show_in_charpath(gs_show_enum *penum) |
| 585 | { return penum->charpath_flag; |
| 586 | } |
| 587 | |
| 588 | /* ------ Internal routines ------ */ |
| 589 | |
| 590 | /* Initialize a show enumerator */ |
| 591 | private int |
| 592 | show_setup(register gs_show_enum *penum, gs_state *pgs, char *str) |
| 593 | { int code; |
| 594 | gs_font *pfont = pgs->font; |
| 595 | penum->pgs = pgs; |
| 596 | penum->level = pgs->level; |
| 597 | penum->str = (byte *)str; /* avoid signed chars */ |
| 598 | penum->wchr = no_chr; |
| 599 | penum->add = 0; |
| 600 | penum->do_kern = 0; |
| 601 | penum->charpath_flag = 0; |
| 602 | penum->stringwidth_flag = 0; |
| 603 | penum->dev_cache_set = 0; |
| 604 | penum->index = 0; |
| 605 | penum->continue_proc = continue_show; |
| 606 | if ( (penum->is_composite = pfont->FontType == ft_composite) ) |
| 607 | { gs_font *rfont = pgs->font; |
| 608 | penum->fstack[0] = rfont; |
| 609 | penum->fdepth = 0; |
| 610 | penum->pfont = |
| 611 | rfont->data.type0_data.FDepVector[rfont->data.type0_data.Encoding[0]]; |
| 612 | } |
| 613 | if ( !pgs->char_tm_valid ) |
| 614 | { /* Compute combined transformation */ |
| 615 | gs_make_identity(&pgs->char_tm); /* make sure type */ |
| 616 | /* fields are set in char_tm! */ |
| 617 | code = gs_matrix_multiply(&pgs->font->FontMatrix, |
| 618 | &ctm_only(pgs), &pgs->char_tm); |
| 619 | if ( code < 0 ) return code; |
| 620 | pgs->char_tm_valid = 1; |
| 621 | } |
| 622 | if ( penum->can_cache = /* no skewing or non-rectangular rotation */ |
| 623 | (is_fzero2(pgs->char_tm.xy, pgs->char_tm.yx) || |
| 624 | is_fzero2(pgs->char_tm.xx, pgs->char_tm.yy)) ) |
| 625 | { gs_fixed_rect cbox; |
| 626 | gx_cpath_box_for_check(pgs->clip_path, &cbox); |
| 627 | penum->cxmin = fixed2int_var(cbox.p.x); |
| 628 | penum->cymin = fixed2int_var(cbox.p.y); |
| 629 | penum->cxmax = fixed2int_var(cbox.q.x); |
| 630 | penum->cymax = fixed2int_var(cbox.q.y); |
| 631 | penum->ftx = (int)fixed2long(float2fixed(pgs->char_tm.tx) - pgs->ctm.tx_fixed); |
| 632 | penum->fty = (int)fixed2long(float2fixed(pgs->char_tm.ty) - pgs->ctm.ty_fixed); |
| 633 | } |
| 634 | return 0; |
| 635 | } |