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Bug 1883518 - Remove a bunch of unused ServoBindings.toml entries. r=firefox-style...
[gecko.git] / gfx / harfbuzz / src / hb-cff-interp-cs-common.hh
blob28a777eb0d4a2129c7f765d37f9dbba3a6fbb783
1 /*
2 * Copyright © 2018 Adobe Inc.
3 *
4 * This is part of HarfBuzz, a text shaping library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 *
24 * Adobe Author(s): Michiharu Ariza
25 */
26 #ifndef HB_CFF_INTERP_CS_COMMON_HH
27 #define HB_CFF_INTERP_CS_COMMON_HH
28
29 #include "hb.hh"
30 #include "hb-cff-interp-common.hh"
31
32 namespace CFF {
33
34 using namespace OT;
35
36 enum cs_type_t {
37 CSType_CharString,
38 CSType_GlobalSubr,
39 CSType_LocalSubr
40 };
41
42 struct call_context_t
43 {
44 void init (const byte_str_ref_t substr_=byte_str_ref_t (), cs_type_t type_=CSType_CharString, unsigned int subr_num_=0)
45 {
46 str_ref = substr_;
47 type = type_;
48 subr_num = subr_num_;
49 }
50
51 void fini () {}
52
53 byte_str_ref_t str_ref;
54 cs_type_t type;
55 unsigned int subr_num;
56 };
57
58 /* call stack */
59 const unsigned int kMaxCallLimit = 10;
60 struct call_stack_t : cff_stack_t<call_context_t, kMaxCallLimit> {};
61
62 template <typename SUBRS>
63 struct biased_subrs_t
64 {
65 void init (const SUBRS *subrs_)
66 {
67 subrs = subrs_;
68 unsigned int nSubrs = get_count ();
69 if (nSubrs < 1240)
70 bias = 107;
71 else if (nSubrs < 33900)
72 bias = 1131;
73 else
74 bias = 32768;
75 }
76
77 void fini () {}
78
79 unsigned int get_count () const { return subrs ? subrs->count : 0; }
80 unsigned int get_bias () const { return bias; }
81
82 hb_ubytes_t operator [] (unsigned int index) const
83 {
84 if (unlikely (!subrs || index >= subrs->count))
85 return hb_ubytes_t ();
86 else
87 return (*subrs)[index];
88 }
89
90 protected:
91 unsigned int bias;
92 const SUBRS *subrs;
93 };
94
95 struct point_t
96 {
97 void set_int (int _x, int _y)
98 {
99 x.set_int (_x);
100 y.set_int (_y);
101 }
102
103 void move_x (const number_t &dx) { x += dx; }
104 void move_y (const number_t &dy) { y += dy; }
105 void move (const number_t &dx, const number_t &dy) { move_x (dx); move_y (dy); }
106 void move (const point_t &d) { move_x (d.x); move_y (d.y); }
107
108 number_t x;
109 number_t y;
110 };
111
112 template <typename ARG, typename SUBRS>
113 struct cs_interp_env_t : interp_env_t<ARG>
114 {
115 cs_interp_env_t (const hb_ubytes_t &str, const SUBRS *globalSubrs_, const SUBRS *localSubrs_) :
116 interp_env_t<ARG> (str)
117 {
118 context.init (str, CSType_CharString);
119 seen_moveto = true;
120 seen_hintmask = false;
121 hstem_count = 0;
122 vstem_count = 0;
123 hintmask_size = 0;
124 pt.set_int (0, 0);
125 globalSubrs.init (globalSubrs_);
126 localSubrs.init (localSubrs_);
127 }
128 ~cs_interp_env_t ()
129 {
130 globalSubrs.fini ();
131 localSubrs.fini ();
132 }
133
134 bool in_error () const
135 {
136 return callStack.in_error () || SUPER::in_error ();
137 }
138
139 bool pop_subr_num (const biased_subrs_t<SUBRS>& biasedSubrs, unsigned int &subr_num)
140 {
141 subr_num = 0;
142 int n = SUPER::argStack.pop_int ();
143 n += biasedSubrs.get_bias ();
144 if (unlikely ((n < 0) || ((unsigned int)n >= biasedSubrs.get_count ())))
145 return false;
146
147 subr_num = (unsigned int)n;
148 return true;
149 }
150
151 void call_subr (const biased_subrs_t<SUBRS>& biasedSubrs, cs_type_t type)
152 {
153 unsigned int subr_num = 0;
154
155 if (unlikely (!pop_subr_num (biasedSubrs, subr_num)
156 || callStack.get_count () >= kMaxCallLimit))
157 {
158 SUPER::set_error ();
159 return;
160 }
161 context.str_ref = SUPER::str_ref;
162 callStack.push (context);
163
164 context.init ( biasedSubrs[subr_num], type, subr_num);
165 SUPER::str_ref = context.str_ref;
166 }
167
168 void return_from_subr ()
169 {
170 if (unlikely (SUPER::str_ref.in_error ()))
171 SUPER::set_error ();
172 context = callStack.pop ();
173 SUPER::str_ref = context.str_ref;
174 }
175
176 void determine_hintmask_size ()
177 {
178 if (!seen_hintmask)
179 {
180 vstem_count += SUPER::argStack.get_count() / 2;
181 hintmask_size = (hstem_count + vstem_count + 7) >> 3;
182 seen_hintmask = true;
183 }
184 }
185
186 void set_endchar (bool endchar_flag_) { endchar_flag = endchar_flag_; }
187 bool is_endchar () const { return endchar_flag; }
188
189 const number_t &get_x () const { return pt.x; }
190 const number_t &get_y () const { return pt.y; }
191 const point_t &get_pt () const { return pt; }
192
193 void moveto (const point_t &pt_ ) { pt = pt_; }
194
195 public:
196 call_context_t context;
197 bool endchar_flag;
198 bool seen_moveto;
199 bool seen_hintmask;
200
201 unsigned int hstem_count;
202 unsigned int vstem_count;
203 unsigned int hintmask_size;
204 call_stack_t callStack;
205 biased_subrs_t<SUBRS> globalSubrs;
206 biased_subrs_t<SUBRS> localSubrs;
207
208 private:
209 point_t pt;
210
211 typedef interp_env_t<ARG> SUPER;
212 };
213
214 template <typename ENV, typename PARAM>
215 struct path_procs_null_t
216 {
217 static void rmoveto (ENV &env, PARAM& param) {}
218 static void hmoveto (ENV &env, PARAM& param) {}
219 static void vmoveto (ENV &env, PARAM& param) {}
220 static void rlineto (ENV &env, PARAM& param) {}
221 static void hlineto (ENV &env, PARAM& param) {}
222 static void vlineto (ENV &env, PARAM& param) {}
223 static void rrcurveto (ENV &env, PARAM& param) {}
224 static void rcurveline (ENV &env, PARAM& param) {}
225 static void rlinecurve (ENV &env, PARAM& param) {}
226 static void vvcurveto (ENV &env, PARAM& param) {}
227 static void hhcurveto (ENV &env, PARAM& param) {}
228 static void vhcurveto (ENV &env, PARAM& param) {}
229 static void hvcurveto (ENV &env, PARAM& param) {}
230 static void moveto (ENV &env, PARAM& param, const point_t &pt) {}
231 static void line (ENV &env, PARAM& param, const point_t &pt1) {}
232 static void curve (ENV &env, PARAM& param, const point_t &pt1, const point_t &pt2, const point_t &pt3) {}
233 static void hflex (ENV &env, PARAM& param) {}
234 static void flex (ENV &env, PARAM& param) {}
235 static void hflex1 (ENV &env, PARAM& param) {}
236 static void flex1 (ENV &env, PARAM& param) {}
237 };
238
239 template <typename ARG, typename OPSET, typename ENV, typename PARAM, typename PATH=path_procs_null_t<ENV, PARAM>>
240 struct cs_opset_t : opset_t<ARG>
241 {
242 static void process_op (op_code_t op, ENV &env, PARAM& param)
243 {
244 switch (op) {
245
246 case OpCode_return:
247 env.return_from_subr ();
248 break;
249 case OpCode_endchar:
250 OPSET::check_width (op, env, param);
251 env.set_endchar (true);
252 OPSET::flush_args_and_op (op, env, param);
253 break;
254
255 case OpCode_fixedcs:
256 env.argStack.push_fixed_from_substr (env.str_ref);
257 break;
258
259 case OpCode_callsubr:
260 env.call_subr (env.localSubrs, CSType_LocalSubr);
261 break;
262
263 case OpCode_callgsubr:
264 env.call_subr (env.globalSubrs, CSType_GlobalSubr);
265 break;
266
267 case OpCode_hstem:
268 case OpCode_hstemhm:
269 OPSET::check_width (op, env, param);
270 OPSET::process_hstem (op, env, param);
271 break;
272 case OpCode_vstem:
273 case OpCode_vstemhm:
274 OPSET::check_width (op, env, param);
275 OPSET::process_vstem (op, env, param);
276 break;
277 case OpCode_hintmask:
278 case OpCode_cntrmask:
279 OPSET::check_width (op, env, param);
280 OPSET::process_hintmask (op, env, param);
281 break;
282 case OpCode_rmoveto:
283 OPSET::check_width (op, env, param);
284 PATH::rmoveto (env, param);
285 OPSET::process_post_move (op, env, param);
286 break;
287 case OpCode_hmoveto:
288 OPSET::check_width (op, env, param);
289 PATH::hmoveto (env, param);
290 OPSET::process_post_move (op, env, param);
291 break;
292 case OpCode_vmoveto:
293 OPSET::check_width (op, env, param);
294 PATH::vmoveto (env, param);
295 OPSET::process_post_move (op, env, param);
296 break;
297 case OpCode_rlineto:
298 PATH::rlineto (env, param);
299 process_post_path (op, env, param);
300 break;
301 case OpCode_hlineto:
302 PATH::hlineto (env, param);
303 process_post_path (op, env, param);
304 break;
305 case OpCode_vlineto:
306 PATH::vlineto (env, param);
307 process_post_path (op, env, param);
308 break;
309 case OpCode_rrcurveto:
310 PATH::rrcurveto (env, param);
311 process_post_path (op, env, param);
312 break;
313 case OpCode_rcurveline:
314 PATH::rcurveline (env, param);
315 process_post_path (op, env, param);
316 break;
317 case OpCode_rlinecurve:
318 PATH::rlinecurve (env, param);
319 process_post_path (op, env, param);
320 break;
321 case OpCode_vvcurveto:
322 PATH::vvcurveto (env, param);
323 process_post_path (op, env, param);
324 break;
325 case OpCode_hhcurveto:
326 PATH::hhcurveto (env, param);
327 process_post_path (op, env, param);
328 break;
329 case OpCode_vhcurveto:
330 PATH::vhcurveto (env, param);
331 process_post_path (op, env, param);
332 break;
333 case OpCode_hvcurveto:
334 PATH::hvcurveto (env, param);
335 process_post_path (op, env, param);
336 break;
337
338 case OpCode_hflex:
339 PATH::hflex (env, param);
340 OPSET::process_post_flex (op, env, param);
341 break;
342
343 case OpCode_flex:
344 PATH::flex (env, param);
345 OPSET::process_post_flex (op, env, param);
346 break;
347
348 case OpCode_hflex1:
349 PATH::hflex1 (env, param);
350 OPSET::process_post_flex (op, env, param);
351 break;
352
353 case OpCode_flex1:
354 PATH::flex1 (env, param);
355 OPSET::process_post_flex (op, env, param);
356 break;
357
358 default:
359 SUPER::process_op (op, env);
360 break;
361 }
362 }
363
364 static void process_hstem (op_code_t op, ENV &env, PARAM& param)
365 {
366 env.hstem_count += env.argStack.get_count () / 2;
367 OPSET::flush_args_and_op (op, env, param);
368 }
369
370 static void process_vstem (op_code_t op, ENV &env, PARAM& param)
371 {
372 env.vstem_count += env.argStack.get_count () / 2;
373 OPSET::flush_args_and_op (op, env, param);
374 }
375
376 static void process_hintmask (op_code_t op, ENV &env, PARAM& param)
377 {
378 env.determine_hintmask_size ();
379 if (likely (env.str_ref.avail (env.hintmask_size)))
380 {
381 OPSET::flush_hintmask (op, env, param);
382 env.str_ref.inc (env.hintmask_size);
383 }
384 }
385
386 static void process_post_flex (op_code_t op, ENV &env, PARAM& param)
387 {
388 OPSET::flush_args_and_op (op, env, param);
389 }
390
391 static void check_width (op_code_t op, ENV &env, PARAM& param)
392 {}
393
394 static void process_post_move (op_code_t op, ENV &env, PARAM& param)
395 {
396 if (!env.seen_moveto)
397 {
398 env.determine_hintmask_size ();
399 env.seen_moveto = true;
400 }
401 OPSET::flush_args_and_op (op, env, param);
402 }
403
404 static void process_post_path (op_code_t op, ENV &env, PARAM& param)
405 {
406 OPSET::flush_args_and_op (op, env, param);
407 }
408
409 static void flush_args_and_op (op_code_t op, ENV &env, PARAM& param)
410 {
411 OPSET::flush_args (env, param);
412 OPSET::flush_op (op, env, param);
413 }
414
415 static void flush_args (ENV &env, PARAM& param)
416 {
417 env.pop_n_args (env.argStack.get_count ());
418 }
419
420 static void flush_op (op_code_t op, ENV &env, PARAM& param)
421 {
422 }
423
424 static void flush_hintmask (op_code_t op, ENV &env, PARAM& param)
425 {
426 OPSET::flush_args_and_op (op, env, param);
427 }
428
429 static bool is_number_op (op_code_t op)
430 {
431 switch (op)
432 {
433 case OpCode_shortint:
434 case OpCode_fixedcs:
435 case OpCode_TwoBytePosInt0: case OpCode_TwoBytePosInt1:
436 case OpCode_TwoBytePosInt2: case OpCode_TwoBytePosInt3:
437 case OpCode_TwoByteNegInt0: case OpCode_TwoByteNegInt1:
438 case OpCode_TwoByteNegInt2: case OpCode_TwoByteNegInt3:
439 return true;
440
441 default:
442 /* 1-byte integer */
443 return (OpCode_OneByteIntFirst <= op) && (op <= OpCode_OneByteIntLast);
444 }
445 }
446
447 protected:
448 typedef opset_t<ARG> SUPER;
449 };
450
451 template <typename PATH, typename ENV, typename PARAM>
452 struct path_procs_t
453 {
454 static void rmoveto (ENV &env, PARAM& param)
455 {
456 point_t pt1 = env.get_pt ();
457 const number_t &dy = env.pop_arg ();
458 const number_t &dx = env.pop_arg ();
459 pt1.move (dx, dy);
460 PATH::moveto (env, param, pt1);
461 }
462
463 static void hmoveto (ENV &env, PARAM& param)
464 {
465 point_t pt1 = env.get_pt ();
466 pt1.move_x (env.pop_arg ());
467 PATH::moveto (env, param, pt1);
468 }
469
470 static void vmoveto (ENV &env, PARAM& param)
471 {
472 point_t pt1 = env.get_pt ();
473 pt1.move_y (env.pop_arg ());
474 PATH::moveto (env, param, pt1);
475 }
476
477 static void rlineto (ENV &env, PARAM& param)
478 {
479 for (unsigned int i = 0; i + 2 <= env.argStack.get_count (); i += 2)
480 {
481 point_t pt1 = env.get_pt ();
482 pt1.move (env.eval_arg (i), env.eval_arg (i+1));
483 PATH::line (env, param, pt1);
484 }
485 }
486
487 static void hlineto (ENV &env, PARAM& param)
488 {
489 point_t pt1;
490 unsigned int i = 0;
491 for (; i + 2 <= env.argStack.get_count (); i += 2)
492 {
493 pt1 = env.get_pt ();
494 pt1.move_x (env.eval_arg (i));
495 PATH::line (env, param, pt1);
496 pt1.move_y (env.eval_arg (i+1));
497 PATH::line (env, param, pt1);
498 }
499 if (i < env.argStack.get_count ())
500 {
501 pt1 = env.get_pt ();
502 pt1.move_x (env.eval_arg (i));
503 PATH::line (env, param, pt1);
504 }
505 }
506
507 static void vlineto (ENV &env, PARAM& param)
508 {
509 point_t pt1;
510 unsigned int i = 0;
511 for (; i + 2 <= env.argStack.get_count (); i += 2)
512 {
513 pt1 = env.get_pt ();
514 pt1.move_y (env.eval_arg (i));
515 PATH::line (env, param, pt1);
516 pt1.move_x (env.eval_arg (i+1));
517 PATH::line (env, param, pt1);
518 }
519 if (i < env.argStack.get_count ())
520 {
521 pt1 = env.get_pt ();
522 pt1.move_y (env.eval_arg (i));
523 PATH::line (env, param, pt1);
524 }
525 }
526
527 static void rrcurveto (ENV &env, PARAM& param)
528 {
529 for (unsigned int i = 0; i + 6 <= env.argStack.get_count (); i += 6)
530 {
531 point_t pt1 = env.get_pt ();
532 pt1.move (env.eval_arg (i), env.eval_arg (i+1));
533 point_t pt2 = pt1;
534 pt2.move (env.eval_arg (i+2), env.eval_arg (i+3));
535 point_t pt3 = pt2;
536 pt3.move (env.eval_arg (i+4), env.eval_arg (i+5));
537 PATH::curve (env, param, pt1, pt2, pt3);
538 }
539 }
540
541 static void rcurveline (ENV &env, PARAM& param)
542 {
543 unsigned int arg_count = env.argStack.get_count ();
544 if (unlikely (arg_count < 8))
545 return;
546
547 unsigned int i = 0;
548 unsigned int curve_limit = arg_count - 2;
549 for (; i + 6 <= curve_limit; i += 6)
550 {
551 point_t pt1 = env.get_pt ();
552 pt1.move (env.eval_arg (i), env.eval_arg (i+1));
553 point_t pt2 = pt1;
554 pt2.move (env.eval_arg (i+2), env.eval_arg (i+3));
555 point_t pt3 = pt2;
556 pt3.move (env.eval_arg (i+4), env.eval_arg (i+5));
557 PATH::curve (env, param, pt1, pt2, pt3);
558 }
559
560 point_t pt1 = env.get_pt ();
561 pt1.move (env.eval_arg (i), env.eval_arg (i+1));
562 PATH::line (env, param, pt1);
563 }
564
565 static void rlinecurve (ENV &env, PARAM& param)
566 {
567 unsigned int arg_count = env.argStack.get_count ();
568 if (unlikely (arg_count < 8))
569 return;
570
571 unsigned int i = 0;
572 unsigned int line_limit = arg_count - 6;
573 for (; i + 2 <= line_limit; i += 2)
574 {
575 point_t pt1 = env.get_pt ();
576 pt1.move (env.eval_arg (i), env.eval_arg (i+1));
577 PATH::line (env, param, pt1);
578 }
579
580 point_t pt1 = env.get_pt ();
581 pt1.move (env.eval_arg (i), env.eval_arg (i+1));
582 point_t pt2 = pt1;
583 pt2.move (env.eval_arg (i+2), env.eval_arg (i+3));
584 point_t pt3 = pt2;
585 pt3.move (env.eval_arg (i+4), env.eval_arg (i+5));
586 PATH::curve (env, param, pt1, pt2, pt3);
587 }
588
589 static void vvcurveto (ENV &env, PARAM& param)
590 {
591 unsigned int i = 0;
592 point_t pt1 = env.get_pt ();
593 if ((env.argStack.get_count () & 1) != 0)
594 pt1.move_x (env.eval_arg (i++));
595 for (; i + 4 <= env.argStack.get_count (); i += 4)
596 {
597 pt1.move_y (env.eval_arg (i));
598 point_t pt2 = pt1;
599 pt2.move (env.eval_arg (i+1), env.eval_arg (i+2));
600 point_t pt3 = pt2;
601 pt3.move_y (env.eval_arg (i+3));
602 PATH::curve (env, param, pt1, pt2, pt3);
603 pt1 = env.get_pt ();
604 }
605 }
606
607 static void hhcurveto (ENV &env, PARAM& param)
608 {
609 unsigned int i = 0;
610 point_t pt1 = env.get_pt ();
611 if ((env.argStack.get_count () & 1) != 0)
612 pt1.move_y (env.eval_arg (i++));
613 for (; i + 4 <= env.argStack.get_count (); i += 4)
614 {
615 pt1.move_x (env.eval_arg (i));
616 point_t pt2 = pt1;
617 pt2.move (env.eval_arg (i+1), env.eval_arg (i+2));
618 point_t pt3 = pt2;
619 pt3.move_x (env.eval_arg (i+3));
620 PATH::curve (env, param, pt1, pt2, pt3);
621 pt1 = env.get_pt ();
622 }
623 }
624
625 static void vhcurveto (ENV &env, PARAM& param)
626 {
627 point_t pt1, pt2, pt3;
628 unsigned int i = 0;
629 if ((env.argStack.get_count () % 8) >= 4)
630 {
631 point_t pt1 = env.get_pt ();
632 pt1.move_y (env.eval_arg (i));
633 point_t pt2 = pt1;
634 pt2.move (env.eval_arg (i+1), env.eval_arg (i+2));
635 point_t pt3 = pt2;
636 pt3.move_x (env.eval_arg (i+3));
637 i += 4;
638
639 for (; i + 8 <= env.argStack.get_count (); i += 8)
640 {
641 PATH::curve (env, param, pt1, pt2, pt3);
642 pt1 = env.get_pt ();
643 pt1.move_x (env.eval_arg (i));
644 pt2 = pt1;
645 pt2.move (env.eval_arg (i+1), env.eval_arg (i+2));
646 pt3 = pt2;
647 pt3.move_y (env.eval_arg (i+3));
648 PATH::curve (env, param, pt1, pt2, pt3);
649
650 pt1 = pt3;
651 pt1.move_y (env.eval_arg (i+4));
652 pt2 = pt1;
653 pt2.move (env.eval_arg (i+5), env.eval_arg (i+6));
654 pt3 = pt2;
655 pt3.move_x (env.eval_arg (i+7));
656 }
657 if (i < env.argStack.get_count ())
658 pt3.move_y (env.eval_arg (i));
659 PATH::curve (env, param, pt1, pt2, pt3);
660 }
661 else
662 {
663 for (; i + 8 <= env.argStack.get_count (); i += 8)
664 {
665 pt1 = env.get_pt ();
666 pt1.move_y (env.eval_arg (i));
667 pt2 = pt1;
668 pt2.move (env.eval_arg (i+1), env.eval_arg (i+2));
669 pt3 = pt2;
670 pt3.move_x (env.eval_arg (i+3));
671 PATH::curve (env, param, pt1, pt2, pt3);
672
673 pt1 = pt3;
674 pt1.move_x (env.eval_arg (i+4));
675 pt2 = pt1;
676 pt2.move (env.eval_arg (i+5), env.eval_arg (i+6));
677 pt3 = pt2;
678 pt3.move_y (env.eval_arg (i+7));
679 if ((env.argStack.get_count () - i < 16) && ((env.argStack.get_count () & 1) != 0))
680 pt3.move_x (env.eval_arg (i+8));
681 PATH::curve (env, param, pt1, pt2, pt3);
682 }
683 }
684 }
685
686 static void hvcurveto (ENV &env, PARAM& param)
687 {
688 point_t pt1, pt2, pt3;
689 unsigned int i = 0;
690 if ((env.argStack.get_count () % 8) >= 4)
691 {
692 point_t pt1 = env.get_pt ();
693 pt1.move_x (env.eval_arg (i));
694 point_t pt2 = pt1;
695 pt2.move (env.eval_arg (i+1), env.eval_arg (i+2));
696 point_t pt3 = pt2;
697 pt3.move_y (env.eval_arg (i+3));
698 i += 4;
699
700 for (; i + 8 <= env.argStack.get_count (); i += 8)
701 {
702 PATH::curve (env, param, pt1, pt2, pt3);
703 pt1 = env.get_pt ();
704 pt1.move_y (env.eval_arg (i));
705 pt2 = pt1;
706 pt2.move (env.eval_arg (i+1), env.eval_arg (i+2));
707 pt3 = pt2;
708 pt3.move_x (env.eval_arg (i+3));
709 PATH::curve (env, param, pt1, pt2, pt3);
710
711 pt1 = pt3;
712 pt1.move_x (env.eval_arg (i+4));
713 pt2 = pt1;
714 pt2.move (env.eval_arg (i+5), env.eval_arg (i+6));
715 pt3 = pt2;
716 pt3.move_y (env.eval_arg (i+7));
717 }
718 if (i < env.argStack.get_count ())
719 pt3.move_x (env.eval_arg (i));
720 PATH::curve (env, param, pt1, pt2, pt3);
721 }
722 else
723 {
724 for (; i + 8 <= env.argStack.get_count (); i += 8)
725 {
726 pt1 = env.get_pt ();
727 pt1.move_x (env.eval_arg (i));
728 pt2 = pt1;
729 pt2.move (env.eval_arg (i+1), env.eval_arg (i+2));
730 pt3 = pt2;
731 pt3.move_y (env.eval_arg (i+3));
732 PATH::curve (env, param, pt1, pt2, pt3);
733
734 pt1 = pt3;
735 pt1.move_y (env.eval_arg (i+4));
736 pt2 = pt1;
737 pt2.move (env.eval_arg (i+5), env.eval_arg (i+6));
738 pt3 = pt2;
739 pt3.move_x (env.eval_arg (i+7));
740 if ((env.argStack.get_count () - i < 16) && ((env.argStack.get_count () & 1) != 0))
741 pt3.move_y (env.eval_arg (i+8));
742 PATH::curve (env, param, pt1, pt2, pt3);
743 }
744 }
745 }
746
747 /* default actions to be overridden */
748 static void moveto (ENV &env, PARAM& param, const point_t &pt)
749 { env.moveto (pt); }
750
751 static void line (ENV &env, PARAM& param, const point_t &pt1)
752 { PATH::moveto (env, param, pt1); }
753
754 static void curve (ENV &env, PARAM& param, const point_t &pt1, const point_t &pt2, const point_t &pt3)
755 { PATH::moveto (env, param, pt3); }
756
757 static void hflex (ENV &env, PARAM& param)
758 {
759 if (likely (env.argStack.get_count () == 7))
760 {
761 point_t pt1 = env.get_pt ();
762 pt1.move_x (env.eval_arg (0));
763 point_t pt2 = pt1;
764 pt2.move (env.eval_arg (1), env.eval_arg (2));
765 point_t pt3 = pt2;
766 pt3.move_x (env.eval_arg (3));
767 point_t pt4 = pt3;
768 pt4.move_x (env.eval_arg (4));
769 point_t pt5 = pt4;
770 pt5.move_x (env.eval_arg (5));
771 pt5.y = pt1.y;
772 point_t pt6 = pt5;
773 pt6.move_x (env.eval_arg (6));
774
775 curve2 (env, param, pt1, pt2, pt3, pt4, pt5, pt6);
776 }
777 else
778 env.set_error ();
779 }
780
781 static void flex (ENV &env, PARAM& param)
782 {
783 if (likely (env.argStack.get_count () == 13))
784 {
785 point_t pt1 = env.get_pt ();
786 pt1.move (env.eval_arg (0), env.eval_arg (1));
787 point_t pt2 = pt1;
788 pt2.move (env.eval_arg (2), env.eval_arg (3));
789 point_t pt3 = pt2;
790 pt3.move (env.eval_arg (4), env.eval_arg (5));
791 point_t pt4 = pt3;
792 pt4.move (env.eval_arg (6), env.eval_arg (7));
793 point_t pt5 = pt4;
794 pt5.move (env.eval_arg (8), env.eval_arg (9));
795 point_t pt6 = pt5;
796 pt6.move (env.eval_arg (10), env.eval_arg (11));
797
798 curve2 (env, param, pt1, pt2, pt3, pt4, pt5, pt6);
799 }
800 else
801 env.set_error ();
802 }
803
804 static void hflex1 (ENV &env, PARAM& param)
805 {
806 if (likely (env.argStack.get_count () == 9))
807 {
808 point_t pt1 = env.get_pt ();
809 pt1.move (env.eval_arg (0), env.eval_arg (1));
810 point_t pt2 = pt1;
811 pt2.move (env.eval_arg (2), env.eval_arg (3));
812 point_t pt3 = pt2;
813 pt3.move_x (env.eval_arg (4));
814 point_t pt4 = pt3;
815 pt4.move_x (env.eval_arg (5));
816 point_t pt5 = pt4;
817 pt5.move (env.eval_arg (6), env.eval_arg (7));
818 point_t pt6 = pt5;
819 pt6.move_x (env.eval_arg (8));
820 pt6.y = env.get_pt ().y;
821
822 curve2 (env, param, pt1, pt2, pt3, pt4, pt5, pt6);
823 }
824 else
825 env.set_error ();
826 }
827
828 static void flex1 (ENV &env, PARAM& param)
829 {
830 if (likely (env.argStack.get_count () == 11))
831 {
832 point_t d;
833 for (unsigned int i = 0; i < 10; i += 2)
834 d.move (env.eval_arg (i), env.eval_arg (i+1));
835
836 point_t pt1 = env.get_pt ();
837 pt1.move (env.eval_arg (0), env.eval_arg (1));
838 point_t pt2 = pt1;
839 pt2.move (env.eval_arg (2), env.eval_arg (3));
840 point_t pt3 = pt2;
841 pt3.move (env.eval_arg (4), env.eval_arg (5));
842 point_t pt4 = pt3;
843 pt4.move (env.eval_arg (6), env.eval_arg (7));
844 point_t pt5 = pt4;
845 pt5.move (env.eval_arg (8), env.eval_arg (9));
846 point_t pt6 = pt5;
847
848 if (fabs (d.x.to_real ()) > fabs (d.y.to_real ()))
849 {
850 pt6.move_x (env.eval_arg (10));
851 pt6.y = env.get_pt ().y;
852 }
853 else
854 {
855 pt6.x = env.get_pt ().x;
856 pt6.move_y (env.eval_arg (10));
857 }
858
859 curve2 (env, param, pt1, pt2, pt3, pt4, pt5, pt6);
860 }
861 else
862 env.set_error ();
863 }
864
865 protected:
866 static void curve2 (ENV &env, PARAM& param,
867 const point_t &pt1, const point_t &pt2, const point_t &pt3,
868 const point_t &pt4, const point_t &pt5, const point_t &pt6)
869 {
870 PATH::curve (env, param, pt1, pt2, pt3);
871 PATH::curve (env, param, pt4, pt5, pt6);
872 }
873 };
874
875 template <typename ENV, typename OPSET, typename PARAM>
876 struct cs_interpreter_t : interpreter_t<ENV>
877 {
878 cs_interpreter_t (ENV& env_) : interpreter_t<ENV> (env_) {}
879
880 bool interpret (PARAM& param)
881 {
882 SUPER::env.set_endchar (false);
883
884 unsigned max_ops = HB_CFF_MAX_OPS;
885 for (;;) {
886 OPSET::process_op (SUPER::env.fetch_op (), SUPER::env, param);
887 if (unlikely (SUPER::env.in_error () || !--max_ops))
888 {
889 SUPER::env.set_error ();
890 return false;
891 }
892 if (SUPER::env.is_endchar ())
893 break;
894 }
895
896 return true;
897 }
898
899 private:
900 typedef interpreter_t<ENV> SUPER;
901 };
902
903 } /* namespace CFF */
904
905 #endif /* HB_CFF_INTERP_CS_COMMON_HH */