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14026336 WJ |
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 | } |