zenilib: zenilib/jni/external/freetype2/src/base/ftstroke.c Source File

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ftstroke.c
Go to the documentation of this file.
1 /***************************************************************************/
2 /* */
3 /* ftstroke.c */
4 /* */
5 /* FreeType path stroker (body). */
6 /* */
7 /* Copyright 2002-2006, 2008-2011 by */
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
9 /* */
10 /* This file is part of the FreeType project, and may only be used, */
11 /* modified, and distributed under the terms of the FreeType project */
12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
13 /* this file you indicate that you have read the license and */
14 /* understand and accept it fully. */
15 /* */
16 /***************************************************************************/
17
18
19 #include <ft2build.h>
20 #include FT_STROKER_H
21 #include FT_TRIGONOMETRY_H
22 #include FT_OUTLINE_H
23 #include FT_INTERNAL_MEMORY_H
24 #include FT_INTERNAL_DEBUG_H
25 #include FT_INTERNAL_OBJECTS_H
26
27
28 /* documentation is in ftstroke.h */
29
30 FT_EXPORT_DEF( FT_StrokerBorder )
31 FT_Outline_GetInsideBorder( FT_Outline* outline )
32 {
33 FT_Orientation o = FT_Outline_Get_Orientation( outline );
34
35
36 return o == FT_ORIENTATION_TRUETYPE ? FT_STROKER_BORDER_RIGHT
37 : FT_STROKER_BORDER_LEFT;
38 }
39
40
41 /* documentation is in ftstroke.h */
42
43 FT_EXPORT_DEF( FT_StrokerBorder )
44 FT_Outline_GetOutsideBorder( FT_Outline* outline )
45 {
46 FT_Orientation o = FT_Outline_Get_Orientation( outline );
47
48
49 return o == FT_ORIENTATION_TRUETYPE ? FT_STROKER_BORDER_LEFT
50 : FT_STROKER_BORDER_RIGHT;
51 }
52
53
54 /*************************************************************************/
55 /*************************************************************************/
56 /***** *****/
57 /***** BEZIER COMPUTATIONS *****/
58 /***** *****/
59 /*************************************************************************/
60 /*************************************************************************/
61
62 #define FT_SMALL_CONIC_THRESHOLD ( FT_ANGLE_PI / 6 )
63 #define FT_SMALL_CUBIC_THRESHOLD ( FT_ANGLE_PI / 8 )
64
65 #define FT_EPSILON 2
66
67 #define FT_IS_SMALL( x ) ( (x) > -FT_EPSILON && (x) < FT_EPSILON )
68
69
70 static FT_Pos
71 ft_pos_abs( FT_Pos x )
72 {
73 return x >= 0 ? x : -x;
74 }
75
76
77 static void
78 ft_conic_split( FT_Vector* base )
79 {
80 FT_Pos a, b;
81
82
83 base[4].x = base[2].x;
84 b = base[1].x;
85 a = base[3].x = ( base[2].x + b ) / 2;
86 b = base[1].x = ( base[0].x + b ) / 2;
87 base[2].x = ( a + b ) / 2;
88
89 base[4].y = base[2].y;
90 b = base[1].y;
91 a = base[3].y = ( base[2].y + b ) / 2;
92 b = base[1].y = ( base[0].y + b ) / 2;
93 base[2].y = ( a + b ) / 2;
94 }
95
96
97 static FT_Bool
98 ft_conic_is_small_enough( FT_Vector* base,
99 FT_Angle *angle_in,
100 FT_Angle *angle_out )
101 {
102 FT_Vector d1, d2;
103 FT_Angle theta;
104 FT_Int close1, close2;
105
106
107 d1.x = base[1].x - base[2].x;
108 d1.y = base[1].y - base[2].y;
109 d2.x = base[0].x - base[1].x;
110 d2.y = base[0].y - base[1].y;
111
112 close1 = FT_IS_SMALL( d1.x ) && FT_IS_SMALL( d1.y );
113 close2 = FT_IS_SMALL( d2.x ) && FT_IS_SMALL( d2.y );
114
115 if ( close1 )
116 {
117 if ( close2 )
118 {
119 /* basically a point; */
120 /* do nothing to retain original direction */
121 }
122 else
123 {
124 *angle_in =
125 *angle_out = FT_Atan2( d2.x, d2.y );
126 }
127 }
128 else /* !close1 */
129 {
130 if ( close2 )
131 {
132 *angle_in =
133 *angle_out = FT_Atan2( d1.x, d1.y );
134 }
135 else
136 {
137 *angle_in = FT_Atan2( d1.x, d1.y );
138 *angle_out = FT_Atan2( d2.x, d2.y );
139 }
140 }
141
142 theta = ft_pos_abs( FT_Angle_Diff( *angle_in, *angle_out ) );
143
144 return FT_BOOL( theta < FT_SMALL_CONIC_THRESHOLD );
145 }
146
147
148 static void
149 ft_cubic_split( FT_Vector* base )
150 {
151 FT_Pos a, b, c, d;
152
153
154 base[6].x = base[3].x;
155 c = base[1].x;
156 d = base[2].x;
157 base[1].x = a = ( base[0].x + c ) / 2;
158 base[5].x = b = ( base[3].x + d ) / 2;
159 c = ( c + d ) / 2;
160 base[2].x = a = ( a + c ) / 2;
161 base[4].x = b = ( b + c ) / 2;
162 base[3].x = ( a + b ) / 2;
163
164 base[6].y = base[3].y;
165 c = base[1].y;
166 d = base[2].y;
167 base[1].y = a = ( base[0].y + c ) / 2;
168 base[5].y = b = ( base[3].y + d ) / 2;
169 c = ( c + d ) / 2;
170 base[2].y = a = ( a + c ) / 2;
171 base[4].y = b = ( b + c ) / 2;
172 base[3].y = ( a + b ) / 2;
173 }
174
175
176 /* Return the average of `angle1' and `angle2'. */
177 /* This gives correct result even if `angle1' and `angle2' */
178 /* have opposite signs. */
179 static FT_Angle
180 ft_angle_mean( FT_Angle angle1,
181 FT_Angle angle2 )
182 {
183 return angle1 + FT_Angle_Diff( angle1, angle2 ) / 2;
184 }
185
186
187 static FT_Bool
188 ft_cubic_is_small_enough( FT_Vector* base,
189 FT_Angle *angle_in,
190 FT_Angle *angle_mid,
191 FT_Angle *angle_out )
192 {
193 FT_Vector d1, d2, d3;
194 FT_Angle theta1, theta2;
195 FT_Int close1, close2, close3;
196
197
198 d1.x = base[2].x - base[3].x;
199 d1.y = base[2].y - base[3].y;
200 d2.x = base[1].x - base[2].x;
201 d2.y = base[1].y - base[2].y;
202 d3.x = base[0].x - base[1].x;
203 d3.y = base[0].y - base[1].y;
204
205 close1 = FT_IS_SMALL( d1.x ) && FT_IS_SMALL( d1.y );
206 close2 = FT_IS_SMALL( d2.x ) && FT_IS_SMALL( d2.y );
207 close3 = FT_IS_SMALL( d3.x ) && FT_IS_SMALL( d3.y );
208
209 if ( close1 )
210 {
211 if ( close2 )
212 {
213 if ( close3 )
214 {
215 /* basically a point; */
216 /* do nothing to retain original direction */
217 }
218 else /* !close3 */
219 {
220 *angle_in =
221 *angle_mid =
222 *angle_out = FT_Atan2( d3.x, d3.y );
223 }
224 }
225 else /* !close2 */
226 {
227 if ( close3 )
228 {
229 *angle_in =
230 *angle_mid =
231 *angle_out = FT_Atan2( d2.x, d2.y );
232 }
233 else /* !close3 */
234 {
235 *angle_in =
236 *angle_mid = FT_Atan2( d2.x, d2.y );
237 *angle_out = FT_Atan2( d3.x, d3.y );
238 }
239 }
240 }
241 else /* !close1 */
242 {
243 if ( close2 )
244 {
245 if ( close3 )
246 {
247 *angle_in =
248 *angle_mid =
249 *angle_out = FT_Atan2( d1.x, d1.y );
250 }
251 else /* !close3 */
252 {
253 *angle_in = FT_Atan2( d1.x, d1.y );
254 *angle_out = FT_Atan2( d3.x, d3.y );
255 *angle_mid = ft_angle_mean( *angle_in, *angle_out );
256 }
257 }
258 else /* !close2 */
259 {
260 if ( close3 )
261 {
262 *angle_in = FT_Atan2( d1.x, d1.y );
263 *angle_mid =
264 *angle_out = FT_Atan2( d2.x, d2.y );
265 }
266 else /* !close3 */
267 {
268 *angle_in = FT_Atan2( d1.x, d1.y );
269 *angle_mid = FT_Atan2( d2.x, d2.y );
270 *angle_out = FT_Atan2( d3.x, d3.y );
271 }
272 }
273 }
274
275 theta1 = ft_pos_abs( FT_Angle_Diff( *angle_in, *angle_mid ) );
276 theta2 = ft_pos_abs( FT_Angle_Diff( *angle_mid, *angle_out ) );
277
278 return FT_BOOL( theta1 < FT_SMALL_CUBIC_THRESHOLD &&
279 theta2 < FT_SMALL_CUBIC_THRESHOLD );
280 }
281
282
283 /*************************************************************************/
284 /*************************************************************************/
285 /***** *****/
286 /***** STROKE BORDERS *****/
287 /***** *****/
288 /*************************************************************************/
289 /*************************************************************************/
290
291 typedef enum FT_StrokeTags_
292 {
293 FT_STROKE_TAG_ON = 1, /* on-curve point */
294 FT_STROKE_TAG_CUBIC = 2, /* cubic off-point */
295 FT_STROKE_TAG_BEGIN = 4, /* sub-path start */
296 FT_STROKE_TAG_END = 8 /* sub-path end */
297
298 } FT_StrokeTags;
299
300 #define FT_STROKE_TAG_BEGIN_END ( FT_STROKE_TAG_BEGIN | FT_STROKE_TAG_END )
301
302 typedef struct FT_StrokeBorderRec_
303 {
304 FT_UInt num_points;
305 FT_UInt max_points;
306 FT_Vector* points;
307 FT_Byte* tags;
308 FT_Bool movable; /* TRUE for ends of lineto borders */
309 FT_Int start; /* index of current sub-path start point */
310 FT_Memory memory;
311 FT_Bool valid;
312
313 } FT_StrokeBorderRec, *FT_StrokeBorder;
314
315
316 static FT_Error
317 ft_stroke_border_grow( FT_StrokeBorder border,
318 FT_UInt new_points )
319 {
320 FT_UInt old_max = border->max_points;
321 FT_UInt new_max = border->num_points + new_points;
322 FT_Error error = FT_Err_Ok;
323
324
325 if ( new_max > old_max )
326 {
327 FT_UInt cur_max = old_max;
328 FT_Memory memory = border->memory;
329
330
331 while ( cur_max < new_max )
332 cur_max += ( cur_max >> 1 ) + 16;
333
334 if ( FT_RENEW_ARRAY( border->points, old_max, cur_max ) ||
335 FT_RENEW_ARRAY( border->tags, old_max, cur_max ) )
336 goto Exit;
337
338 border->max_points = cur_max;
339 }
340
341 Exit:
342 return error;
343 }
344
345
346 static void
347 ft_stroke_border_close( FT_StrokeBorder border,
348 FT_Bool reverse )
349 {
350 FT_UInt start = border->start;
351 FT_UInt count = border->num_points;
352
353
354 FT_ASSERT( border->start >= 0 );
355
356 /* don't record empty paths! */
357 if ( count <= start + 1U )
358 border->num_points = start;
359 else
360 {
361 /* copy the last point to the start of this sub-path, since */
362 /* it contains the `adjusted' starting coordinates */
363 border->num_points = --count;
364 border->points[start] = border->points[count];
365
366 if ( reverse )
367 {
368 /* reverse the points */
369 {
370 FT_Vector* vec1 = border->points + start + 1;
371 FT_Vector* vec2 = border->points + count - 1;
372
373
374 for ( ; vec1 < vec2; vec1++, vec2-- )
375 {
376 FT_Vector tmp;
377
378
379 tmp = *vec1;
380 *vec1 = *vec2;
381 *vec2 = tmp;
382 }
383 }
384
385 /* then the tags */
386 {
387 FT_Byte* tag1 = border->tags + start + 1;
388 FT_Byte* tag2 = border->tags + count - 1;
389
390
391 for ( ; tag1 < tag2; tag1++, tag2-- )
392 {
393 FT_Byte tmp;
394
395
396 tmp = *tag1;
397 *tag1 = *tag2;
398 *tag2 = tmp;
399 }
400 }
401 }
402
403 border->tags[start ] |= FT_STROKE_TAG_BEGIN;
404 border->tags[count - 1] |= FT_STROKE_TAG_END;
405 }
406
407 border->start = -1;
408 border->movable = FALSE;
409 }
410
411
412 static FT_Error
413 ft_stroke_border_lineto( FT_StrokeBorder border,
414 FT_Vector* to,
415 FT_Bool movable )
416 {
417 FT_Error error = FT_Err_Ok;
418
419
420 FT_ASSERT( border->start >= 0 );
421
422 if ( border->movable )
423 {
424 /* move last point */
425 border->points[border->num_points - 1] = *to;
426 }
427 else
428 {
429 /* don't add zero-length lineto */
430 if ( border->num_points > 0 &&
431 FT_IS_SMALL( border->points[border->num_points - 1].x - to->x ) &&
432 FT_IS_SMALL( border->points[border->num_points - 1].y - to->y ) )
433 return error;
434
435 /* add one point */
436 error = ft_stroke_border_grow( border, 1 );
437 if ( !error )
438 {
439 FT_Vector* vec = border->points + border->num_points;
440 FT_Byte* tag = border->tags + border->num_points;
441
442
443 vec[0] = *to;
444 tag[0] = FT_STROKE_TAG_ON;
445
446 border->num_points += 1;
447 }
448 }
449 border->movable = movable;
450 return error;
451 }
452
453
454 static FT_Error
455 ft_stroke_border_conicto( FT_StrokeBorder border,
456 FT_Vector* control,
457 FT_Vector* to )
458 {
459 FT_Error error;
460
461
462 FT_ASSERT( border->start >= 0 );
463
464 error = ft_stroke_border_grow( border, 2 );
465 if ( !error )
466 {
467 FT_Vector* vec = border->points + border->num_points;
468 FT_Byte* tag = border->tags + border->num_points;
469
470
471 vec[0] = *control;
472 vec[1] = *to;
473
474 tag[0] = 0;
475 tag[1] = FT_STROKE_TAG_ON;
476
477 border->num_points += 2;
478 }
479
480 border->movable = FALSE;
481
482 return error;
483 }
484
485
486 static FT_Error
487 ft_stroke_border_cubicto( FT_StrokeBorder border,
488 FT_Vector* control1,
489 FT_Vector* control2,
490 FT_Vector* to )
491 {
492 FT_Error error;
493
494
495 FT_ASSERT( border->start >= 0 );
496
497 error = ft_stroke_border_grow( border, 3 );
498 if ( !error )
499 {
500 FT_Vector* vec = border->points + border->num_points;
501 FT_Byte* tag = border->tags + border->num_points;
502
503
504 vec[0] = *control1;
505 vec[1] = *control2;
506 vec[2] = *to;
507
508 tag[0] = FT_STROKE_TAG_CUBIC;
509 tag[1] = FT_STROKE_TAG_CUBIC;
510 tag[2] = FT_STROKE_TAG_ON;
511
512 border->num_points += 3;
513 }
514
515 border->movable = FALSE;
516
517 return error;
518 }
519
520
521 #define FT_ARC_CUBIC_ANGLE ( FT_ANGLE_PI / 2 )
522
523
524 static FT_Error
525 ft_stroke_border_arcto( FT_StrokeBorder border,
526 FT_Vector* center,
527 FT_Fixed radius,
528 FT_Angle angle_start,
529 FT_Angle angle_diff )
530 {
531 FT_Angle total, angle, step, rotate, next, theta;
532 FT_Vector a, b, a2, b2;
533 FT_Fixed length;
534 FT_Error error = FT_Err_Ok;
535
536
537 /* compute start point */
538 FT_Vector_From_Polar( &a, radius, angle_start );
539 a.x += center->x;
540 a.y += center->y;
541
542 total = angle_diff;
543 angle = angle_start;
544 rotate = ( angle_diff >= 0 ) ? FT_ANGLE_PI2 : -FT_ANGLE_PI2;
545
546 while ( total != 0 )
547 {
548 step = total;
549 if ( step > FT_ARC_CUBIC_ANGLE )
550 step = FT_ARC_CUBIC_ANGLE;
551
552 else if ( step < -FT_ARC_CUBIC_ANGLE )
553 step = -FT_ARC_CUBIC_ANGLE;
554
555 next = angle + step;
556 theta = step;
557 if ( theta < 0 )
558 theta = -theta;
559
560 theta >>= 1;
561
562 /* compute end point */
563 FT_Vector_From_Polar( &b, radius, next );
564 b.x += center->x;
565 b.y += center->y;
566
567 /* compute first and second control points */
568 length = FT_MulDiv( radius, FT_Sin( theta ) * 4,
569 ( 0x10000L + FT_Cos( theta ) ) * 3 );
570
571 FT_Vector_From_Polar( &a2, length, angle + rotate );
572 a2.x += a.x;
573 a2.y += a.y;
574
575 FT_Vector_From_Polar( &b2, length, next - rotate );
576 b2.x += b.x;
577 b2.y += b.y;
578
579 /* add cubic arc */
580 error = ft_stroke_border_cubicto( border, &a2, &b2, &b );
581 if ( error )
582 break;
583
584 /* process the rest of the arc ?? */
585 a = b;
586 total -= step;
587 angle = next;
588 }
589
590 return error;
591 }
592
593
594 static FT_Error
595 ft_stroke_border_moveto( FT_StrokeBorder border,
596 FT_Vector* to )
597 {
598 /* close current open path if any ? */
599 if ( border->start >= 0 )
600 ft_stroke_border_close( border, FALSE );
601
602 border->start = border->num_points;
603 border->movable = FALSE;
604
605 return ft_stroke_border_lineto( border, to, FALSE );
606 }
607
608
609 static void
610 ft_stroke_border_init( FT_StrokeBorder border,
611 FT_Memory memory )
612 {
613 border->memory = memory;
614 border->points = NULL;
615 border->tags = NULL;
616
617 border->num_points = 0;
618 border->max_points = 0;
619 border->start = -1;
620 border->valid = FALSE;
621 }
622
623
624 static void
625 ft_stroke_border_reset( FT_StrokeBorder border )
626 {
627 border->num_points = 0;
628 border->start = -1;
629 border->valid = FALSE;
630 }
631
632
633 static void
634 ft_stroke_border_done( FT_StrokeBorder border )
635 {
636 FT_Memory memory = border->memory;
637
638
639 FT_FREE( border->points );
640 FT_FREE( border->tags );
641
642 border->num_points = 0;
643 border->max_points = 0;
644 border->start = -1;
645 border->valid = FALSE;
646 }
647
648
649 static FT_Error
650 ft_stroke_border_get_counts( FT_StrokeBorder border,
651 FT_UInt *anum_points,
652 FT_UInt *anum_contours )
653 {
654 FT_Error error = FT_Err_Ok;
655 FT_UInt num_points = 0;
656 FT_UInt num_contours = 0;
657
658 FT_UInt count = border->num_points;
659 FT_Vector* point = border->points;
660 FT_Byte* tags = border->tags;
661 FT_Int in_contour = 0;
662
663
664 for ( ; count > 0; count--, num_points++, point++, tags++ )
665 {
666 if ( tags[0] & FT_STROKE_TAG_BEGIN )
667 {
668 if ( in_contour != 0 )
669 goto Fail;
670
671 in_contour = 1;
672 }
673 else if ( in_contour == 0 )
674 goto Fail;
675
676 if ( tags[0] & FT_STROKE_TAG_END )
677 {
678 in_contour = 0;
679 num_contours++;
680 }
681 }
682
683 if ( in_contour != 0 )
684 goto Fail;
685
686 border->valid = TRUE;
687
688 Exit:
689 *anum_points = num_points;
690 *anum_contours = num_contours;
691 return error;
692
693 Fail:
694 num_points = 0;
695 num_contours = 0;
696 goto Exit;
697 }
698
699
700 static void
701 ft_stroke_border_export( FT_StrokeBorder border,
702 FT_Outline* outline )
703 {
704 /* copy point locations */
705 FT_ARRAY_COPY( outline->points + outline->n_points,
706 border->points,
707 border->num_points );
708
709 /* copy tags */
710 {
711 FT_UInt count = border->num_points;
712 FT_Byte* read = border->tags;
713 FT_Byte* write = (FT_Byte*)outline->tags + outline->n_points;
714
715
716 for ( ; count > 0; count--, read++, write++ )
717 {
718 if ( *read & FT_STROKE_TAG_ON )
719 *write = FT_CURVE_TAG_ON;
720 else if ( *read & FT_STROKE_TAG_CUBIC )
721 *write = FT_CURVE_TAG_CUBIC;
722 else
723 *write = FT_CURVE_TAG_CONIC;
724 }
725 }
726
727 /* copy contours */
728 {
729 FT_UInt count = border->num_points;
730 FT_Byte* tags = border->tags;
731 FT_Short* write = outline->contours + outline->n_contours;
732 FT_Short idx = (FT_Short)outline->n_points;
733
734
735 for ( ; count > 0; count--, tags++, idx++ )
736 {
737 if ( *tags & FT_STROKE_TAG_END )
738 {
739 *write++ = idx;
740 outline->n_contours++;
741 }
742 }
743 }
744
745 outline->n_points = (short)( outline->n_points + border->num_points );
746
747 FT_ASSERT( FT_Outline_Check( outline ) == 0 );
748 }
749
750
751 /*************************************************************************/
752 /*************************************************************************/
753 /***** *****/
754 /***** STROKER *****/
755 /***** *****/
756 /*************************************************************************/
757 /*************************************************************************/
758
759 #define FT_SIDE_TO_ROTATE( s ) ( FT_ANGLE_PI2 - (s) * FT_ANGLE_PI )
760
761 typedef struct FT_StrokerRec_
762 {
763 FT_Angle angle_in; /* direction into curr join */
764 FT_Angle angle_out; /* direction out of join */
765 FT_Vector center; /* current position */
766 FT_Fixed line_length; /* length of last lineto */
767 FT_Bool first_point; /* is this the start? */
768 FT_Bool subpath_open; /* is the subpath open? */
769 FT_Angle subpath_angle; /* subpath start direction */
770 FT_Vector subpath_start; /* subpath start position */
771 FT_Fixed subpath_line_length; /* subpath start lineto len */
772 FT_Bool handle_wide_strokes; /* use wide strokes logic? */
773
774 FT_Stroker_LineCap line_cap;
775 FT_Stroker_LineJoin line_join;
776 FT_Stroker_LineJoin line_join_saved;
777 FT_Fixed miter_limit;
778 FT_Fixed radius;
779
780 FT_StrokeBorderRec borders[2];
781 FT_Library library;
782
783 } FT_StrokerRec;
784
785
786 /* documentation is in ftstroke.h */
787
788 FT_EXPORT_DEF( FT_Error )
789 FT_Stroker_New( FT_Library library,
790 FT_Stroker *astroker )
791 {
792 FT_Error error;
793 FT_Memory memory;
794 FT_Stroker stroker = NULL;
795
796
797 if ( !library )
798 return FT_Err_Invalid_Argument;
799
800 memory = library->memory;
801
802 if ( !FT_NEW( stroker ) )
803 {
804 stroker->library = library;
805
806 ft_stroke_border_init( &stroker->borders[0], memory );
807 ft_stroke_border_init( &stroker->borders[1], memory );
808 }
809
810 *astroker = stroker;
811
812 return error;
813 }
814
815
816 /* documentation is in ftstroke.h */
817
818 FT_EXPORT_DEF( void )
819 FT_Stroker_Set( FT_Stroker stroker,
820 FT_Fixed radius,
821 FT_Stroker_LineCap line_cap,
822 FT_Stroker_LineJoin line_join,
823 FT_Fixed miter_limit )
824 {
825 stroker->radius = radius;
826 stroker->line_cap = line_cap;
827 stroker->line_join = line_join;
828 stroker->miter_limit = miter_limit;
829
830 /* ensure miter limit has sensible value */
831 if ( stroker->miter_limit < 0x10000 )
832 stroker->miter_limit = 0x10000;
833
834 /* save line join style: */
835 /* line join style can be temporarily changed when stroking curves */
836 stroker->line_join_saved = line_join;
837
838 FT_Stroker_Rewind( stroker );
839 }
840
841
842 /* documentation is in ftstroke.h */
843
844 FT_EXPORT_DEF( void )
845 FT_Stroker_Rewind( FT_Stroker stroker )
846 {
847 if ( stroker )
848 {
849 ft_stroke_border_reset( &stroker->borders[0] );
850 ft_stroke_border_reset( &stroker->borders[1] );
851 }
852 }
853
854
855 /* documentation is in ftstroke.h */
856
857 FT_EXPORT_DEF( void )
858 FT_Stroker_Done( FT_Stroker stroker )
859 {
860 if ( stroker )
861 {
862 FT_Memory memory = stroker->library->memory;
863
864
865 ft_stroke_border_done( &stroker->borders[0] );
866 ft_stroke_border_done( &stroker->borders[1] );
867
868 stroker->library = NULL;
869 FT_FREE( stroker );
870 }
871 }
872
873
874 /* create a circular arc at a corner or cap */
875 static FT_Error
876 ft_stroker_arcto( FT_Stroker stroker,
877 FT_Int side )
878 {
879 FT_Angle total, rotate;
880 FT_Fixed radius = stroker->radius;
881 FT_Error error = FT_Err_Ok;
882 FT_StrokeBorder border = stroker->borders + side;
883
884
885 rotate = FT_SIDE_TO_ROTATE( side );
886
887 total = FT_Angle_Diff( stroker->angle_in, stroker->angle_out );
888 if ( total == FT_ANGLE_PI )
889 total = -rotate * 2;
890
891 error = ft_stroke_border_arcto( border,
892 &stroker->center,
893 radius,
894 stroker->angle_in + rotate,
895 total );
896 border->movable = FALSE;
897 return error;
898 }
899
900
901 /* add a cap at the end of an opened path */
902 static FT_Error
903 ft_stroker_cap( FT_Stroker stroker,
904 FT_Angle angle,
905 FT_Int side )
906 {
907 FT_Error error = FT_Err_Ok;
908
909
910 if ( stroker->line_cap == FT_STROKER_LINECAP_ROUND )
911 {
912 /* add a round cap */
913 stroker->angle_in = angle;
914 stroker->angle_out = angle + FT_ANGLE_PI;
915
916 error = ft_stroker_arcto( stroker, side );
917 }
918 else if ( stroker->line_cap == FT_STROKER_LINECAP_SQUARE )
919 {
920 /* add a square cap */
921 FT_Vector delta, delta2;
922 FT_Angle rotate = FT_SIDE_TO_ROTATE( side );
923 FT_Fixed radius = stroker->radius;
924 FT_StrokeBorder border = stroker->borders + side;
925
926
927 FT_Vector_From_Polar( &delta2, radius, angle + rotate );
928 FT_Vector_From_Polar( &delta, radius, angle );
929
930 delta.x += stroker->center.x + delta2.x;
931 delta.y += stroker->center.y + delta2.y;
932
933 error = ft_stroke_border_lineto( border, &delta, FALSE );
934 if ( error )
935 goto Exit;
936
937 FT_Vector_From_Polar( &delta2, radius, angle - rotate );
938 FT_Vector_From_Polar( &delta, radius, angle );
939
940 delta.x += delta2.x + stroker->center.x;
941 delta.y += delta2.y + stroker->center.y;
942
943 error = ft_stroke_border_lineto( border, &delta, FALSE );
944 }
945 else if ( stroker->line_cap == FT_STROKER_LINECAP_BUTT )
946 {
947 /* add a butt ending */
948 FT_Vector delta;
949 FT_Angle rotate = FT_SIDE_TO_ROTATE( side );
950 FT_Fixed radius = stroker->radius;
951 FT_StrokeBorder border = stroker->borders + side;
952
953
954 FT_Vector_From_Polar( &delta, radius, angle + rotate );
955
956 delta.x += stroker->center.x;
957 delta.y += stroker->center.y;
958
959 error = ft_stroke_border_lineto( border, &delta, FALSE );
960 if ( error )
961 goto Exit;
962
963 FT_Vector_From_Polar( &delta, radius, angle - rotate );
964
965 delta.x += stroker->center.x;
966 delta.y += stroker->center.y;
967
968 error = ft_stroke_border_lineto( border, &delta, FALSE );
969 }
970
971 Exit:
972 return error;
973 }
974
975
976 /* process an inside corner, i.e. compute intersection */
977 static FT_Error
978 ft_stroker_inside( FT_Stroker stroker,
979 FT_Int side,
980 FT_Fixed line_length )
981 {
982 FT_StrokeBorder border = stroker->borders + side;
983 FT_Angle phi, theta, rotate;
984 FT_Fixed length, thcos;
985 FT_Vector delta;
986 FT_Error error = FT_Err_Ok;
987 FT_Bool intersect; /* use intersection of lines? */
988
989
990 rotate = FT_SIDE_TO_ROTATE( side );
991
992 theta = FT_Angle_Diff( stroker->angle_in, stroker->angle_out ) / 2;
993
994 /* Only intersect borders if between two lineto's and both */
995 /* lines are long enough (line_length is zero for curves). */
996 if ( !border->movable || line_length == 0 )
997 intersect = FALSE;
998 else
999 {
1000 /* compute minimum required length of lines */
1001 FT_Fixed min_length = ft_pos_abs( FT_MulFix( stroker->radius,
1002 FT_Tan( theta ) ) );
1003
1004
1005 intersect = FT_BOOL( stroker->line_length >= min_length &&
1006 line_length >= min_length );
1007 }
1008
1009 if ( !intersect )
1010 {
1011 FT_Vector_From_Polar( &delta, stroker->radius,
1012 stroker->angle_out + rotate );
1013 delta.x += stroker->center.x;
1014 delta.y += stroker->center.y;
1015
1016 border->movable = FALSE;
1017 }
1018 else
1019 {
1020 /* compute median angle */
1021 phi = stroker->angle_in + theta;
1022
1023 thcos = FT_Cos( theta );
1024
1025 length = FT_DivFix( stroker->radius, thcos );
1026
1027 FT_Vector_From_Polar( &delta, length, phi + rotate );
1028 delta.x += stroker->center.x;
1029 delta.y += stroker->center.y;
1030 }
1031
1032 error = ft_stroke_border_lineto( border, &delta, FALSE );
1033
1034 return error;
1035 }
1036
1037
1038 /* process an outside corner, i.e. compute bevel/miter/round */
1039 static FT_Error
1040 ft_stroker_outside( FT_Stroker stroker,
1041 FT_Int side,
1042 FT_Fixed line_length )
1043 {
1044 FT_StrokeBorder border = stroker->borders + side;
1045 FT_Error error;
1046 FT_Angle rotate;
1047
1048
1049 if ( stroker->line_join == FT_STROKER_LINEJOIN_ROUND )
1050 error = ft_stroker_arcto( stroker, side );
1051 else
1052 {
1053 /* this is a mitered (pointed) or beveled (truncated) corner */
1054 FT_Fixed sigma = 0, radius = stroker->radius;
1055 FT_Angle theta = 0, phi = 0;
1056 FT_Fixed thcos = 0;
1057 FT_Bool bevel, fixed_bevel;
1058
1059
1060 rotate = FT_SIDE_TO_ROTATE( side );
1061
1062 bevel =
1063 FT_BOOL( stroker->line_join == FT_STROKER_LINEJOIN_BEVEL );
1064
1065 fixed_bevel =
1066 FT_BOOL( stroker->line_join != FT_STROKER_LINEJOIN_MITER_VARIABLE );
1067
1068 if ( !bevel )
1069 {
1070 theta = FT_Angle_Diff( stroker->angle_in, stroker->angle_out );
1071
1072 if ( theta == FT_ANGLE_PI )
1073 {
1074 theta = rotate;
1075 phi = stroker->angle_in;
1076 }
1077 else
1078 {
1079 theta /= 2;
1080 phi = stroker->angle_in + theta + rotate;
1081 }
1082
1083 thcos = FT_Cos( theta );
1084 sigma = FT_MulFix( stroker->miter_limit, thcos );
1085
1086 /* is miter limit exceeded? */
1087 if ( sigma < 0x10000L )
1088 {
1089 /* don't create variable bevels for very small deviations; */
1090 /* FT_Sin(x) = 0 for x <= 57 */
1091 if ( fixed_bevel || ft_pos_abs( theta ) > 57 )
1092 bevel = TRUE;
1093 }
1094 }
1095
1096 if ( bevel ) /* this is a bevel (broken angle) */
1097 {
1098 if ( fixed_bevel )
1099 {
1100 /* the outer corners are simply joined together */
1101 FT_Vector delta;
1102
1103
1104 /* add bevel */
1105 FT_Vector_From_Polar( &delta,
1106 radius,
1107 stroker->angle_out + rotate );
1108 delta.x += stroker->center.x;
1109 delta.y += stroker->center.y;
1110
1111 border->movable = FALSE;
1112 error = ft_stroke_border_lineto( border, &delta, FALSE );
1113 }
1114 else /* variable bevel */
1115 {
1116 /* the miter is truncated */
1117 FT_Vector middle, delta;
1118 FT_Fixed length;
1119
1120
1121 /* compute middle point */
1122 FT_Vector_From_Polar( &middle,
1123 FT_MulFix( radius, stroker->miter_limit ),
1124 phi );
1125 middle.x += stroker->center.x;
1126 middle.y += stroker->center.y;
1127
1128 /* compute first angle point */
1129 length = FT_MulFix( radius,
1130 FT_DivFix( 0x10000L - sigma,
1131 ft_pos_abs( FT_Sin( theta ) ) ) );
1132
1133 FT_Vector_From_Polar( &delta, length, phi + rotate );
1134 delta.x += middle.x;
1135 delta.y += middle.y;
1136
1137 error = ft_stroke_border_lineto( border, &delta, FALSE );
1138 if ( error )
1139 goto Exit;
1140
1141 /* compute second angle point */
1142 FT_Vector_From_Polar( &delta, length, phi - rotate );
1143 delta.x += middle.x;
1144 delta.y += middle.y;
1145
1146 error = ft_stroke_border_lineto( border, &delta, FALSE );
1147 if ( error )
1148 goto Exit;
1149
1150 /* finally, add an end point; only needed if not lineto */
1151 /* (line_length is zero for curves) */
1152 if ( line_length == 0 )
1153 {
1154 FT_Vector_From_Polar( &delta,
1155 radius,
1156 stroker->angle_out + rotate );
1157
1158 delta.x += stroker->center.x;
1159 delta.y += stroker->center.y;
1160
1161 error = ft_stroke_border_lineto( border, &delta, FALSE );
1162 }
1163 }
1164 }
1165 else /* this is a miter (intersection) */
1166 {
1167 FT_Fixed length;
1168 FT_Vector delta;
1169
1170
1171 length = FT_DivFix( stroker->radius, thcos );
1172
1173 FT_Vector_From_Polar( &delta, length, phi );
1174 delta.x += stroker->center.x;
1175 delta.y += stroker->center.y;
1176
1177 error = ft_stroke_border_lineto( border, &delta, FALSE );
1178 if ( error )
1179 goto Exit;
1180
1181 /* now add an end point; only needed if not lineto */
1182 /* (line_length is zero for curves) */
1183 if ( line_length == 0 )
1184 {
1185 FT_Vector_From_Polar( &delta,
1186 stroker->radius,
1187 stroker->angle_out + rotate );
1188 delta.x += stroker->center.x;
1189 delta.y += stroker->center.y;
1190
1191 error = ft_stroke_border_lineto( border, &delta, FALSE );
1192 }
1193 }
1194 }
1195
1196 Exit:
1197 return error;
1198 }
1199
1200
1201 static FT_Error
1202 ft_stroker_process_corner( FT_Stroker stroker,
1203 FT_Fixed line_length )
1204 {
1205 FT_Error error = FT_Err_Ok;
1206 FT_Angle turn;
1207 FT_Int inside_side;
1208
1209
1210 turn = FT_Angle_Diff( stroker->angle_in, stroker->angle_out );
1211
1212 /* no specific corner processing is required if the turn is 0 */
1213 if ( turn == 0 )
1214 goto Exit;
1215
1216 /* when we turn to the right, the inside side is 0 */
1217 inside_side = 0;
1218
1219 /* otherwise, the inside side is 1 */
1220 if ( turn < 0 )
1221 inside_side = 1;
1222
1223 /* process the inside side */
1224 error = ft_stroker_inside( stroker, inside_side, line_length );
1225 if ( error )
1226 goto Exit;
1227
1228 /* process the outside side */
1229 error = ft_stroker_outside( stroker, 1 - inside_side, line_length );
1230
1231 Exit:
1232 return error;
1233 }
1234
1235
1236 /* add two points to the left and right borders corresponding to the */
1237 /* start of the subpath */
1238 static FT_Error
1239 ft_stroker_subpath_start( FT_Stroker stroker,
1240 FT_Angle start_angle,
1241 FT_Fixed line_length )
1242 {
1243 FT_Vector delta;
1244 FT_Vector point;
1245 FT_Error error;
1246 FT_StrokeBorder border;
1247
1248
1249 FT_Vector_From_Polar( &delta, stroker->radius,
1250 start_angle + FT_ANGLE_PI2 );
1251
1252 point.x = stroker->center.x + delta.x;
1253 point.y = stroker->center.y + delta.y;
1254
1255 border = stroker->borders;
1256 error = ft_stroke_border_moveto( border, &point );
1257 if ( error )
1258 goto Exit;
1259
1260 point.x = stroker->center.x - delta.x;
1261 point.y = stroker->center.y - delta.y;
1262
1263 border++;
1264 error = ft_stroke_border_moveto( border, &point );
1265
1266 /* save angle, position, and line length for last join */
1267 /* (line_length is zero for curves) */
1268 stroker->subpath_angle = start_angle;
1269 stroker->first_point = FALSE;
1270 stroker->subpath_line_length = line_length;
1271
1272 Exit:
1273 return error;
1274 }
1275
1276
1277 /* documentation is in ftstroke.h */
1278
1279 FT_EXPORT_DEF( FT_Error )
1280 FT_Stroker_LineTo( FT_Stroker stroker,
1281 FT_Vector* to )
1282 {
1283 FT_Error error = FT_Err_Ok;
1284 FT_StrokeBorder border;
1285 FT_Vector delta;
1286 FT_Angle angle;
1287 FT_Int side;
1288 FT_Fixed line_length;
1289
1290
1291 delta.x = to->x - stroker->center.x;
1292 delta.y = to->y - stroker->center.y;
1293
1294 /* a zero-length lineto is a no-op; avoid creating a spurious corner */
1295 if ( delta.x == 0 && delta.y == 0 )
1296 goto Exit;
1297
1298 /* compute length of line */
1299 line_length = FT_Vector_Length( &delta );
1300
1301 angle = FT_Atan2( delta.x, delta.y );
1302 FT_Vector_From_Polar( &delta, stroker->radius, angle + FT_ANGLE_PI2 );
1303
1304 /* process corner if necessary */
1305 if ( stroker->first_point )
1306 {
1307 /* This is the first segment of a subpath. We need to */
1308 /* add a point to each border at their respective starting */
1309 /* point locations. */
1310 error = ft_stroker_subpath_start( stroker, angle, line_length );
1311 if ( error )
1312 goto Exit;
1313 }
1314 else
1315 {
1316 /* process the current corner */
1317 stroker->angle_out = angle;
1318 error = ft_stroker_process_corner( stroker, line_length );
1319 if ( error )
1320 goto Exit;
1321 }
1322
1323 /* now add a line segment to both the `inside' and `outside' paths */
1324 for ( border = stroker->borders, side = 1; side >= 0; side--, border++ )
1325 {
1326 FT_Vector point;
1327
1328
1329 point.x = to->x + delta.x;
1330 point.y = to->y + delta.y;
1331
1332 /* the ends of lineto borders are movable */
1333 error = ft_stroke_border_lineto( border, &point, TRUE );
1334 if ( error )
1335 goto Exit;
1336
1337 delta.x = -delta.x;
1338 delta.y = -delta.y;
1339 }
1340
1341 stroker->angle_in = angle;
1342 stroker->center = *to;
1343 stroker->line_length = line_length;
1344
1345 Exit:
1346 return error;
1347 }
1348
1349
1350 /* documentation is in ftstroke.h */
1351
1352 FT_EXPORT_DEF( FT_Error )
1353 FT_Stroker_ConicTo( FT_Stroker stroker,
1354 FT_Vector* control,
1355 FT_Vector* to )
1356 {
1357 FT_Error error = FT_Err_Ok;
1358 FT_Vector bez_stack[34];
1359 FT_Vector* arc;
1360 FT_Vector* limit = bez_stack + 30;
1361 FT_Bool first_arc = TRUE;
1362
1363
1364 /* if all control points are coincident, this is a no-op; */
1365 /* avoid creating a spurious corner */
1366 if ( FT_IS_SMALL( stroker->center.x - control->x ) &&
1367 FT_IS_SMALL( stroker->center.y - control->y ) &&
1368 FT_IS_SMALL( control->x - to->x ) &&
1369 FT_IS_SMALL( control->y - to->y ) )
1370 {
1371 stroker->center = *to;
1372 goto Exit;
1373 }
1374
1375 arc = bez_stack;
1376 arc[0] = *to;
1377 arc[1] = *control;
1378 arc[2] = stroker->center;
1379
1380 while ( arc >= bez_stack )
1381 {
1382 FT_Angle angle_in, angle_out;
1383
1384
1385 /* initialize with current direction */
1386 angle_in = angle_out = stroker->angle_in;
1387
1388 if ( arc < limit &&
1389 !ft_conic_is_small_enough( arc, &angle_in, &angle_out ) )
1390 {
1391 if ( stroker->first_point )
1392 stroker->angle_in = angle_in;
1393
1394 ft_conic_split( arc );
1395 arc += 2;
1396 continue;
1397 }
1398
1399 if ( first_arc )
1400 {
1401 first_arc = FALSE;
1402
1403 /* process corner if necessary */
1404 if ( stroker->first_point )
1405 error = ft_stroker_subpath_start( stroker, angle_in, 0 );
1406 else
1407 {
1408 stroker->angle_out = angle_in;
1409 error = ft_stroker_process_corner( stroker, 0 );
1410 }
1411 }
1412 else if ( ft_pos_abs( FT_Angle_Diff( stroker->angle_in, angle_in ) ) >
1413 FT_SMALL_CONIC_THRESHOLD / 4 )
1414 {
1415 /* if the deviation from one arc to the next is too great, */
1416 /* add a round corner */
1417 stroker->center = arc[2];
1418 stroker->angle_out = angle_in;
1419 stroker->line_join = FT_STROKER_LINEJOIN_ROUND;
1420
1421 error = ft_stroker_process_corner( stroker, 0 );
1422
1423 /* reinstate line join style */
1424 stroker->line_join = stroker->line_join_saved;
1425 }
1426
1427 if ( error )
1428 goto Exit;
1429
1430 /* the arc's angle is small enough; we can add it directly to each */
1431 /* border */
1432 {
1433 FT_Vector ctrl, end;
1434 FT_Angle theta, phi, rotate, alpha0 = 0;
1435 FT_Fixed length;
1436 FT_StrokeBorder border;
1437 FT_Int side;
1438
1439
1440 theta = FT_Angle_Diff( angle_in, angle_out ) / 2;
1441 phi = angle_in + theta;
1442 length = FT_DivFix( stroker->radius, FT_Cos( theta ) );
1443
1444 /* compute direction of original arc */
1445 if ( stroker->handle_wide_strokes )
1446 alpha0 = FT_Atan2( arc[0].x - arc[2].x, arc[0].y - arc[2].y );
1447
1448 for ( border = stroker->borders, side = 0;
1449 side <= 1;
1450 side++, border++ )
1451 {
1452 rotate = FT_SIDE_TO_ROTATE( side );
1453
1454 /* compute control point */
1455 FT_Vector_From_Polar( &ctrl, length, phi + rotate );
1456 ctrl.x += arc[1].x;
1457 ctrl.y += arc[1].y;
1458
1459 /* compute end point */
1460 FT_Vector_From_Polar( &end, stroker->radius, angle_out + rotate );
1461 end.x += arc[0].x;
1462 end.y += arc[0].y;
1463
1464 if ( stroker->handle_wide_strokes )
1465 {
1466 FT_Vector start;
1467 FT_Angle alpha1;
1468
1469
1470 /* determine whether the border radius is greater than the */
1471 /* radius of curvature of the original arc */
1472 start = border->points[border->num_points - 1];
1473
1474 alpha1 = FT_Atan2( end.x - start.x, end.y - start.y );
1475
1476 /* is the direction of the border arc opposite to */
1477 /* that of the original arc? */
1478 if ( ft_pos_abs( FT_Angle_Diff( alpha0, alpha1 ) ) >
1479 FT_ANGLE_PI / 2 )
1480 {
1481 FT_Angle beta, gamma;
1482 FT_Vector bvec, delta;
1483 FT_Fixed blen, sinA, sinB, alen;
1484
1485
1486 /* use the sine rule to find the intersection point */
1487 beta = FT_Atan2( arc[2].x - start.x, arc[2].y - start.y );
1488 gamma = FT_Atan2( arc[0].x - end.x, arc[0].y - end.y );
1489
1490 bvec.x = end.x - start.x;
1491 bvec.y = end.y - start.y;
1492
1493 blen = FT_Vector_Length( &bvec );
1494
1495 sinA = ft_pos_abs( FT_Sin( alpha1 - gamma ) );
1496 sinB = ft_pos_abs( FT_Sin( beta - gamma ) );
1497
1498 alen = FT_DivFix( FT_MulFix( blen, sinA ), sinB );
1499
1500 FT_Vector_From_Polar( &delta, alen, beta );
1501 delta.x += start.x;
1502 delta.y += start.y;
1503
1504 /* circumnavigate the negative sector backwards */
1505 border->movable = FALSE;
1506 error = ft_stroke_border_lineto( border, &delta, FALSE );
1507 if ( error )
1508 goto Exit;
1509 error = ft_stroke_border_lineto( border, &end, FALSE );
1510 if ( error )
1511 goto Exit;
1512 error = ft_stroke_border_conicto( border, &ctrl, &start );
1513 if ( error )
1514 goto Exit;
1515 /* and then move to the endpoint */
1516 error = ft_stroke_border_lineto( border, &end, FALSE );
1517 if ( error )
1518 goto Exit;
1519
1520 continue;
1521 }
1522
1523 /* else fall through */
1524 }
1525
1526 /* simply add an arc */
1527 error = ft_stroke_border_conicto( border, &ctrl, &end );
1528 if ( error )
1529 goto Exit;
1530 }
1531 }
1532
1533 arc -= 2;
1534
1535 stroker->angle_in = angle_out;
1536 }
1537
1538 stroker->center = *to;
1539
1540 Exit:
1541 return error;
1542 }
1543
1544
1545 /* documentation is in ftstroke.h */
1546
1547 FT_EXPORT_DEF( FT_Error )
1548 FT_Stroker_CubicTo( FT_Stroker stroker,
1549 FT_Vector* control1,
1550 FT_Vector* control2,
1551 FT_Vector* to )
1552 {
1553 FT_Error error = FT_Err_Ok;
1554 FT_Vector bez_stack[37];
1555 FT_Vector* arc;
1556 FT_Vector* limit = bez_stack + 32;
1557 FT_Bool first_arc = TRUE;
1558
1559
1560 /* if all control points are coincident, this is a no-op; */
1561 /* avoid creating a spurious corner */
1562 if ( FT_IS_SMALL( stroker->center.x - control1->x ) &&
1563 FT_IS_SMALL( stroker->center.y - control1->y ) &&
1564 FT_IS_SMALL( control1->x - control2->x ) &&
1565 FT_IS_SMALL( control1->y - control2->y ) &&
1566 FT_IS_SMALL( control2->x - to->x ) &&
1567 FT_IS_SMALL( control2->y - to->y ) )
1568 {
1569 stroker->center = *to;
1570 goto Exit;
1571 }
1572
1573 arc = bez_stack;
1574 arc[0] = *to;
1575 arc[1] = *control2;
1576 arc[2] = *control1;
1577 arc[3] = stroker->center;
1578
1579 while ( arc >= bez_stack )
1580 {
1581 FT_Angle angle_in, angle_mid, angle_out;
1582
1583
1584 /* initialize with current direction */
1585 angle_in = angle_out = angle_mid = stroker->angle_in;
1586
1587 if ( arc < limit &&
1588 !ft_cubic_is_small_enough( arc, &angle_in,
1589 &angle_mid, &angle_out ) )
1590 {
1591 if ( stroker->first_point )
1592 stroker->angle_in = angle_in;
1593
1594 ft_cubic_split( arc );
1595 arc += 3;
1596 continue;
1597 }
1598
1599 if ( first_arc )
1600 {
1601 first_arc = FALSE;
1602
1603 /* process corner if necessary */
1604 if ( stroker->first_point )
1605 error = ft_stroker_subpath_start( stroker, angle_in, 0 );
1606 else
1607 {
1608 stroker->angle_out = angle_in;
1609 error = ft_stroker_process_corner( stroker, 0 );
1610 }
1611 }
1612 else if ( ft_pos_abs( FT_Angle_Diff( stroker->angle_in, angle_in ) ) >
1613 FT_SMALL_CUBIC_THRESHOLD / 4 )
1614 {
1615 /* if the deviation from one arc to the next is too great, */
1616 /* add a round corner */
1617 stroker->center = arc[3];
1618 stroker->angle_out = angle_in;
1619 stroker->line_join = FT_STROKER_LINEJOIN_ROUND;
1620
1621 error = ft_stroker_process_corner( stroker, 0 );
1622
1623 /* reinstate line join style */
1624 stroker->line_join = stroker->line_join_saved;
1625 }
1626
1627 if ( error )
1628 goto Exit;
1629
1630 /* the arc's angle is small enough; we can add it directly to each */
1631 /* border */
1632 {
1633 FT_Vector ctrl1, ctrl2, end;
1634 FT_Angle theta1, phi1, theta2, phi2, rotate, alpha0 = 0;
1635 FT_Fixed length1, length2;
1636 FT_StrokeBorder border;
1637 FT_Int side;
1638
1639
1640 theta1 = FT_Angle_Diff( angle_in, angle_mid ) / 2;
1641 theta2 = FT_Angle_Diff( angle_mid, angle_out ) / 2;
1642 phi1 = ft_angle_mean( angle_in, angle_mid );
1643 phi2 = ft_angle_mean( angle_mid, angle_out );
1644 length1 = FT_DivFix( stroker->radius, FT_Cos( theta1 ) );
1645 length2 = FT_DivFix( stroker->radius, FT_Cos( theta2 ) );
1646
1647 /* compute direction of original arc */
1648 if ( stroker->handle_wide_strokes )
1649 alpha0 = FT_Atan2( arc[0].x - arc[3].x, arc[0].y - arc[3].y );
1650
1651 for ( border = stroker->borders, side = 0;
1652 side <= 1;
1653 side++, border++ )
1654 {
1655 rotate = FT_SIDE_TO_ROTATE( side );
1656
1657 /* compute control points */
1658 FT_Vector_From_Polar( &ctrl1, length1, phi1 + rotate );
1659 ctrl1.x += arc[2].x;
1660 ctrl1.y += arc[2].y;
1661
1662 FT_Vector_From_Polar( &ctrl2, length2, phi2 + rotate );
1663 ctrl2.x += arc[1].x;
1664 ctrl2.y += arc[1].y;
1665
1666 /* compute end point */
1667 FT_Vector_From_Polar( &end, stroker->radius, angle_out + rotate );
1668 end.x += arc[0].x;
1669 end.y += arc[0].y;
1670
1671 if ( stroker->handle_wide_strokes )
1672 {
1673 FT_Vector start;
1674 FT_Angle alpha1;
1675
1676
1677 /* determine whether the border radius is greater than the */
1678 /* radius of curvature of the original arc */
1679 start = border->points[border->num_points - 1];
1680
1681 alpha1 = FT_Atan2( end.x - start.x, end.y - start.y );
1682
1683 /* is the direction of the border arc opposite to */
1684 /* that of the original arc? */
1685 if ( ft_pos_abs( FT_Angle_Diff( alpha0, alpha1 ) ) >
1686 FT_ANGLE_PI / 2 )
1687 {
1688 FT_Angle beta, gamma;
1689 FT_Vector bvec, delta;
1690 FT_Fixed blen, sinA, sinB, alen;
1691
1692
1693 /* use the sine rule to find the intersection point */
1694 beta = FT_Atan2( arc[3].x - start.x, arc[3].y - start.y );
1695 gamma = FT_Atan2( arc[0].x - end.x, arc[0].y - end.y );
1696
1697 bvec.x = end.x - start.x;
1698 bvec.y = end.y - start.y;
1699
1700 blen = FT_Vector_Length( &bvec );
1701
1702 sinA = ft_pos_abs( FT_Sin( alpha1 - gamma ) );
1703 sinB = ft_pos_abs( FT_Sin( beta - gamma ) );
1704
1705 alen = FT_DivFix( FT_MulFix( blen, sinA ), sinB );
1706
1707 FT_Vector_From_Polar( &delta, alen, beta );
1708 delta.x += start.x;
1709 delta.y += start.y;
1710
1711 /* circumnavigate the negative sector backwards */
1712 border->movable = FALSE;
1713 error = ft_stroke_border_lineto( border, &delta, FALSE );
1714 if ( error )
1715 goto Exit;
1716 error = ft_stroke_border_lineto( border, &end, FALSE );
1717 if ( error )
1718 goto Exit;
1719 error = ft_stroke_border_cubicto( border,
1720 &ctrl2,
1721 &ctrl1,
1722 &start );
1723 if ( error )
1724 goto Exit;
1725 /* and then move to the endpoint */
1726 error = ft_stroke_border_lineto( border, &end, FALSE );
1727 if ( error )
1728 goto Exit;
1729
1730 continue;
1731 }
1732
1733 /* else fall through */
1734 }
1735
1736 /* simply add an arc */
1737 error = ft_stroke_border_cubicto( border, &ctrl1, &ctrl2, &end );
1738 if ( error )
1739 goto Exit;
1740 }
1741 }
1742
1743 arc -= 3;
1744
1745 stroker->angle_in = angle_out;
1746 }
1747
1748 stroker->center = *to;
1749
1750 Exit:
1751 return error;
1752 }
1753
1754
1755 /* documentation is in ftstroke.h */
1756
1757 FT_EXPORT_DEF( FT_Error )
1758 FT_Stroker_BeginSubPath( FT_Stroker stroker,
1759 FT_Vector* to,
1760 FT_Bool open )
1761 {
1762 /* We cannot process the first point, because there is not enough */
1763 /* information regarding its corner/cap. The latter will be processed */
1764 /* in the `FT_Stroker_EndSubPath' routine. */
1765 /* */
1766 stroker->first_point = TRUE;
1767 stroker->center = *to;
1768 stroker->subpath_open = open;
1769
1770 /* Determine if we need to check whether the border radius is greater */
1771 /* than the radius of curvature of a curve, to handle this case */
1772 /* specially. This is only required if bevel joins or butt caps may */
1773 /* be created, because round & miter joins and round & square caps */
1774 /* cover the negative sector created with wide strokes. */
1775 stroker->handle_wide_strokes =
1776 FT_BOOL( stroker->line_join != FT_STROKER_LINEJOIN_ROUND ||
1777 ( stroker->subpath_open &&
1778 stroker->line_cap == FT_STROKER_LINECAP_BUTT ) );
1779
1780 /* record the subpath start point for each border */
1781 stroker->subpath_start = *to;
1782
1783 stroker->angle_in = 0;
1784
1785 return FT_Err_Ok;
1786 }
1787
1788
1789 static FT_Error
1790 ft_stroker_add_reverse_left( FT_Stroker stroker,
1791 FT_Bool open )
1792 {
1793 FT_StrokeBorder right = stroker->borders + 0;
1794 FT_StrokeBorder left = stroker->borders + 1;
1795 FT_Int new_points;
1796 FT_Error error = FT_Err_Ok;
1797
1798
1799 FT_ASSERT( left->start >= 0 );
1800
1801 new_points = left->num_points - left->start;
1802 if ( new_points > 0 )
1803 {
1804 error = ft_stroke_border_grow( right, (FT_UInt)new_points );
1805 if ( error )
1806 goto Exit;
1807
1808 {
1809 FT_Vector* dst_point = right->points + right->num_points;
1810 FT_Byte* dst_tag = right->tags + right->num_points;
1811 FT_Vector* src_point = left->points + left->num_points - 1;
1812 FT_Byte* src_tag = left->tags + left->num_points - 1;
1813
1814
1815 while ( src_point >= left->points + left->start )
1816 {
1817 *dst_point = *src_point;
1818 *dst_tag = *src_tag;
1819
1820 if ( open )
1821 dst_tag[0] &= ~FT_STROKE_TAG_BEGIN_END;
1822 else
1823 {
1824 FT_Byte ttag =
1825 (FT_Byte)( dst_tag[0] & FT_STROKE_TAG_BEGIN_END );
1826
1827
1828 /* switch begin/end tags if necessary */
1829 if ( ttag == FT_STROKE_TAG_BEGIN ||
1830 ttag == FT_STROKE_TAG_END )
1831 dst_tag[0] ^= FT_STROKE_TAG_BEGIN_END;
1832 }
1833
1834 src_point--;
1835 src_tag--;
1836 dst_point++;
1837 dst_tag++;
1838 }
1839 }
1840
1841 left->num_points = left->start;
1842 right->num_points += new_points;
1843
1844 right->movable = FALSE;
1845 left->movable = FALSE;
1846 }
1847
1848 Exit:
1849 return error;
1850 }
1851
1852
1853 /* documentation is in ftstroke.h */
1854
1855 /* there's a lot of magic in this function! */
1856 FT_EXPORT_DEF( FT_Error )
1857 FT_Stroker_EndSubPath( FT_Stroker stroker )
1858 {
1859 FT_Error error = FT_Err_Ok;
1860
1861
1862 if ( stroker->subpath_open )
1863 {
1864 FT_StrokeBorder right = stroker->borders;
1865
1866
1867 /* All right, this is an opened path, we need to add a cap between */
1868 /* right & left, add the reverse of left, then add a final cap */
1869 /* between left & right. */
1870 error = ft_stroker_cap( stroker, stroker->angle_in, 0 );
1871 if ( error )
1872 goto Exit;
1873
1874 /* add reversed points from `left' to `right' */
1875 error = ft_stroker_add_reverse_left( stroker, TRUE );
1876 if ( error )
1877 goto Exit;
1878
1879 /* now add the final cap */
1880 stroker->center = stroker->subpath_start;
1881 error = ft_stroker_cap( stroker,
1882 stroker->subpath_angle + FT_ANGLE_PI, 0 );
1883 if ( error )
1884 goto Exit;
1885
1886 /* Now end the right subpath accordingly. The left one is */
1887 /* rewind and doesn't need further processing. */
1888 ft_stroke_border_close( right, FALSE );
1889 }
1890 else
1891 {
1892 FT_Angle turn;
1893 FT_Int inside_side;
1894
1895
1896 /* close the path if needed */
1897 if ( stroker->center.x != stroker->subpath_start.x ||
1898 stroker->center.y != stroker->subpath_start.y )
1899 {
1900 error = FT_Stroker_LineTo( stroker, &stroker->subpath_start );
1901 if ( error )
1902 goto Exit;
1903 }
1904
1905 /* process the corner */
1906 stroker->angle_out = stroker->subpath_angle;
1907 turn = FT_Angle_Diff( stroker->angle_in,
1908 stroker->angle_out );
1909
1910 /* no specific corner processing is required if the turn is 0 */
1911 if ( turn != 0 )
1912 {
1913 /* when we turn to the right, the inside side is 0 */
1914 inside_side = 0;
1915
1916 /* otherwise, the inside side is 1 */
1917 if ( turn < 0 )
1918 inside_side = 1;
1919
1920 error = ft_stroker_inside( stroker,
1921 inside_side,
1922 stroker->subpath_line_length );
1923 if ( error )
1924 goto Exit;
1925
1926 /* process the outside side */
1927 error = ft_stroker_outside( stroker,
1928 1 - inside_side,
1929 stroker->subpath_line_length );
1930 if ( error )
1931 goto Exit;
1932 }
1933
1934 /* then end our two subpaths */
1935 ft_stroke_border_close( stroker->borders + 0, FALSE );
1936 ft_stroke_border_close( stroker->borders + 1, TRUE );
1937 }
1938
1939 Exit:
1940 return error;
1941 }
1942
1943
1944 /* documentation is in ftstroke.h */
1945
1946 FT_EXPORT_DEF( FT_Error )
1947 FT_Stroker_GetBorderCounts( FT_Stroker stroker,
1948 FT_StrokerBorder border,
1949 FT_UInt *anum_points,
1950 FT_UInt *anum_contours )
1951 {
1952 FT_UInt num_points = 0, num_contours = 0;
1953 FT_Error error;
1954
1955
1956 if ( !stroker || border > 1 )
1957 {
1958 error = FT_Err_Invalid_Argument;
1959 goto Exit;
1960 }
1961
1962 error = ft_stroke_border_get_counts( stroker->borders + border,
1963 &num_points, &num_contours );
1964 Exit:
1965 if ( anum_points )
1966 *anum_points = num_points;
1967
1968 if ( anum_contours )
1969 *anum_contours = num_contours;
1970
1971 return error;
1972 }
1973
1974
1975 /* documentation is in ftstroke.h */
1976
1977 FT_EXPORT_DEF( FT_Error )
1978 FT_Stroker_GetCounts( FT_Stroker stroker,
1979 FT_UInt *anum_points,
1980 FT_UInt *anum_contours )
1981 {
1982 FT_UInt count1, count2, num_points = 0;
1983 FT_UInt count3, count4, num_contours = 0;
1984 FT_Error error;
1985
1986
1987 error = ft_stroke_border_get_counts( stroker->borders + 0,
1988 &count1, &count2 );
1989 if ( error )
1990 goto Exit;
1991
1992 error = ft_stroke_border_get_counts( stroker->borders + 1,
1993 &count3, &count4 );
1994 if ( error )
1995 goto Exit;
1996
1997 num_points = count1 + count3;
1998 num_contours = count2 + count4;
1999
2000 Exit:
2001 *anum_points = num_points;
2002 *anum_contours = num_contours;
2003 return error;
2004 }
2005
2006
2007 /* documentation is in ftstroke.h */
2008
2009 FT_EXPORT_DEF( void )
2010 FT_Stroker_ExportBorder( FT_Stroker stroker,
2011 FT_StrokerBorder border,
2012 FT_Outline* outline )
2013 {
2014 if ( border == FT_STROKER_BORDER_LEFT ||
2015 border == FT_STROKER_BORDER_RIGHT )
2016 {
2017 FT_StrokeBorder sborder = & stroker->borders[border];
2018
2019
2020 if ( sborder->valid )
2021 ft_stroke_border_export( sborder, outline );
2022 }
2023 }
2024
2025
2026 /* documentation is in ftstroke.h */
2027
2028 FT_EXPORT_DEF( void )
2029 FT_Stroker_Export( FT_Stroker stroker,
2030 FT_Outline* outline )
2031 {
2032 FT_Stroker_ExportBorder( stroker, FT_STROKER_BORDER_LEFT, outline );
2033 FT_Stroker_ExportBorder( stroker, FT_STROKER_BORDER_RIGHT, outline );
2034 }
2035
2036
2037 /* documentation is in ftstroke.h */
2038
2039 /*
2040 * The following is very similar to FT_Outline_Decompose, except
2041 * that we do support opened paths, and do not scale the outline.
2042 */
2043 FT_EXPORT_DEF( FT_Error )
2044 FT_Stroker_ParseOutline( FT_Stroker stroker,
2045 FT_Outline* outline,
2046 FT_Bool opened )
2047 {
2048 FT_Vector v_last;
2049 FT_Vector v_control;
2050 FT_Vector v_start;
2051
2052 FT_Vector* point;
2053 FT_Vector* limit;
2054 char* tags;
2055
2056 FT_Error error;
2057
2058 FT_Int n; /* index of contour in outline */
2059 FT_UInt first; /* index of first point in contour */
2060 FT_Int tag; /* current point's state */
2061
2062
2063 if ( !outline || !stroker )
2064 return FT_Err_Invalid_Argument;
2065
2066 FT_Stroker_Rewind( stroker );
2067
2068 first = 0;
2069
2070 for ( n = 0; n < outline->n_contours; n++ )
2071 {
2072 FT_UInt last; /* index of last point in contour */
2073
2074
2075 last = outline->contours[n];
2076 limit = outline->points + last;
2077
2078 /* skip empty points; we don't stroke these */
2079 if ( last <= first )
2080 {
2081 first = last + 1;
2082 continue;
2083 }
2084
2085 v_start = outline->points[first];
2086 v_last = outline->points[last];
2087
2088 v_control = v_start;
2089
2090 point = outline->points + first;
2091 tags = outline->tags + first;
2092 tag = FT_CURVE_TAG( tags[0] );
2093
2094 /* A contour cannot start with a cubic control point! */
2095 if ( tag == FT_CURVE_TAG_CUBIC )
2096 goto Invalid_Outline;
2097
2098 /* check first point to determine origin */
2099 if ( tag == FT_CURVE_TAG_CONIC )
2100 {
2101 /* First point is conic control. Yes, this happens. */
2102 if ( FT_CURVE_TAG( outline->tags[last] ) == FT_CURVE_TAG_ON )
2103 {
2104 /* start at last point if it is on the curve */
2105 v_start = v_last;
2106 limit--;
2107 }
2108 else
2109 {
2110 /* if both first and last points are conic, */
2111 /* start at their middle */
2112 v_start.x = ( v_start.x + v_last.x ) / 2;
2113 v_start.y = ( v_start.y + v_last.y ) / 2;
2114 }
2115 point--;
2116 tags--;
2117 }
2118
2119 error = FT_Stroker_BeginSubPath( stroker, &v_start, opened );
2120 if ( error )
2121 goto Exit;
2122
2123 while ( point < limit )
2124 {
2125 point++;
2126 tags++;
2127
2128 tag = FT_CURVE_TAG( tags[0] );
2129 switch ( tag )
2130 {
2131 case FT_CURVE_TAG_ON: /* emit a single line_to */
2132 {
2133 FT_Vector vec;
2134
2135
2136 vec.x = point->x;
2137 vec.y = point->y;
2138
2139 error = FT_Stroker_LineTo( stroker, &vec );
2140 if ( error )
2141 goto Exit;
2142 continue;
2143 }
2144
2145 case FT_CURVE_TAG_CONIC: /* consume conic arcs */
2146 v_control.x = point->x;
2147 v_control.y = point->y;
2148
2149 Do_Conic:
2150 if ( point < limit )
2151 {
2152 FT_Vector vec;
2153 FT_Vector v_middle;
2154
2155
2156 point++;
2157 tags++;
2158 tag = FT_CURVE_TAG( tags[0] );
2159
2160 vec = point[0];
2161
2162 if ( tag == FT_CURVE_TAG_ON )
2163 {
2164 error = FT_Stroker_ConicTo( stroker, &v_control, &vec );
2165 if ( error )
2166 goto Exit;
2167 continue;
2168 }
2169
2170 if ( tag != FT_CURVE_TAG_CONIC )
2171 goto Invalid_Outline;
2172
2173 v_middle.x = ( v_control.x + vec.x ) / 2;
2174 v_middle.y = ( v_control.y + vec.y ) / 2;
2175
2176 error = FT_Stroker_ConicTo( stroker, &v_control, &v_middle );
2177 if ( error )
2178 goto Exit;
2179
2180 v_control = vec;
2181 goto Do_Conic;
2182 }
2183
2184 error = FT_Stroker_ConicTo( stroker, &v_control, &v_start );
2185 goto Close;
2186
2187 default: /* FT_CURVE_TAG_CUBIC */
2188 {
2189 FT_Vector vec1, vec2;
2190
2191
2192 if ( point + 1 > limit ||
2193 FT_CURVE_TAG( tags[1] ) != FT_CURVE_TAG_CUBIC )
2194 goto Invalid_Outline;
2195
2196 point += 2;
2197 tags += 2;
2198
2199 vec1 = point[-2];
2200 vec2 = point[-1];
2201
2202 if ( point <= limit )
2203 {
2204 FT_Vector vec;
2205
2206
2207 vec = point[0];
2208
2209 error = FT_Stroker_CubicTo( stroker, &vec1, &vec2, &vec );
2210 if ( error )
2211 goto Exit;
2212 continue;
2213 }
2214
2215 error = FT_Stroker_CubicTo( stroker, &vec1, &vec2, &v_start );
2216 goto Close;
2217 }
2218 }
2219 }
2220
2221 Close:
2222 if ( error )
2223 goto Exit;
2224
2225 /* don't try to end the path if no segments have been generated */
2226 if ( !stroker->first_point )
2227 {
2228 error = FT_Stroker_EndSubPath( stroker );
2229 if ( error )
2230 goto Exit;
2231 }
2232
2233 first = last + 1;
2234 }
2235
2236 return FT_Err_Ok;
2237
2238 Exit:
2239 return error;
2240
2241 Invalid_Outline:
2242 return FT_Err_Invalid_Outline;
2243 }
2244
2245
2246 /* declare an extern to access `ft_outline_glyph_class' globally */
2247 /* allocated in `ftglyph.c', and use the FT_OUTLINE_GLYPH_CLASS_GET */
2248 /* macro to access it when FT_CONFIG_OPTION_PIC is defined */
2249 #ifndef FT_CONFIG_OPTION_PIC
2250 extern const FT_Glyph_Class ft_outline_glyph_class;
2251 #endif
2252 #include "basepic.h"
2253
2254
2255 /* documentation is in ftstroke.h */
2256
2257 FT_EXPORT_DEF( FT_Error )
2258 FT_Glyph_Stroke( FT_Glyph *pglyph,
2259 FT_Stroker stroker,
2260 FT_Bool destroy )
2261 {
2262 FT_Error error = FT_Err_Invalid_Argument;
2263 FT_Glyph glyph = NULL;
2264 FT_Library library = stroker->library;
2265
2266 FT_UNUSED( library );
2267
2268
2269 if ( pglyph == NULL )
2270 goto Exit;
2271
2272 glyph = *pglyph;
2273 if ( glyph == NULL || glyph->clazz != FT_OUTLINE_GLYPH_CLASS_GET )
2274 goto Exit;
2275
2276 {
2277 FT_Glyph copy;
2278
2279
2280 error = FT_Glyph_Copy( glyph, &copy );
2281 if ( error )
2282 goto Exit;
2283
2284 glyph = copy;
2285 }
2286
2287 {
2288 FT_OutlineGlyph oglyph = (FT_OutlineGlyph)glyph;
2289 FT_Outline* outline = &oglyph->outline;
2290 FT_UInt num_points, num_contours;
2291
2292
2293 error = FT_Stroker_ParseOutline( stroker, outline, FALSE );
2294 if ( error )
2295 goto Fail;
2296
2297 (void)FT_Stroker_GetCounts( stroker, &num_points, &num_contours );
2298
2299 FT_Outline_Done( glyph->library, outline );
2300
2301 error = FT_Outline_New( glyph->library,
2302 num_points, num_contours, outline );
2303 if ( error )
2304 goto Fail;
2305
2306 outline->n_points = 0;
2307 outline->n_contours = 0;
2308
2309 FT_Stroker_Export( stroker, outline );
2310 }
2311
2312 if ( destroy )
2313 FT_Done_Glyph( *pglyph );
2314
2315 *pglyph = glyph;
2316 goto Exit;
2317
2318 Fail:
2319 FT_Done_Glyph( glyph );
2320 glyph = NULL;
2321
2322 if ( !destroy )
2323 *pglyph = NULL;
2324
2325 Exit:
2326 return error;
2327 }
2328
2329
2330 /* documentation is in ftstroke.h */
2331
2332 FT_EXPORT_DEF( FT_Error )
2333 FT_Glyph_StrokeBorder( FT_Glyph *pglyph,
2334 FT_Stroker stroker,
2335 FT_Bool inside,
2336 FT_Bool destroy )
2337 {
2338 FT_Error error = FT_Err_Invalid_Argument;
2339 FT_Glyph glyph = NULL;
2340 FT_Library library = stroker->library;
2341
2342 FT_UNUSED( library );
2343
2344
2345 if ( pglyph == NULL )
2346 goto Exit;
2347
2348 glyph = *pglyph;
2349 if ( glyph == NULL || glyph->clazz != FT_OUTLINE_GLYPH_CLASS_GET )
2350 goto Exit;
2351
2352 {
2353 FT_Glyph copy;
2354
2355
2356 error = FT_Glyph_Copy( glyph, &copy );
2357 if ( error )
2358 goto Exit;
2359
2360 glyph = copy;
2361 }
2362
2363 {
2364 FT_OutlineGlyph oglyph = (FT_OutlineGlyph)glyph;
2365 FT_StrokerBorder border;
2366 FT_Outline* outline = &oglyph->outline;
2367 FT_UInt num_points, num_contours;
2368
2369
2370 border = FT_Outline_GetOutsideBorder( outline );
2371 if ( inside )
2372 {
2373 if ( border == FT_STROKER_BORDER_LEFT )
2374 border = FT_STROKER_BORDER_RIGHT;
2375 else
2376 border = FT_STROKER_BORDER_LEFT;
2377 }
2378
2379 error = FT_Stroker_ParseOutline( stroker, outline, FALSE );
2380 if ( error )
2381 goto Fail;
2382
2383 (void)FT_Stroker_GetBorderCounts( stroker, border,
2384 &num_points, &num_contours );
2385
2386 FT_Outline_Done( glyph->library, outline );
2387
2388 error = FT_Outline_New( glyph->library,
2389 num_points,
2390 num_contours,
2391 outline );
2392 if ( error )
2393 goto Fail;
2394
2395 outline->n_points = 0;
2396 outline->n_contours = 0;
2397
2398 FT_Stroker_ExportBorder( stroker, border, outline );
2399 }
2400
2401 if ( destroy )
2402 FT_Done_Glyph( *pglyph );
2403
2404 *pglyph = glyph;
2405 goto Exit;
2406
2407 Fail:
2408 FT_Done_Glyph( glyph );
2409 glyph = NULL;
2410
2411 if ( !destroy )
2412 *pglyph = NULL;
2413
2414 Exit:
2415 return error;
2416 }
2417
2418
2419 /* END */
FT_ORIENTATION_TRUETYPE
Definition: ftoutln.h:492
FT_Stroker_LineCap
enum FT_Stroker_LineCap_ FT_Stroker_LineCap
FT_Error
int FT_Error
Definition: fttypes.h:296
FT_Stroker_ParseOutline
FT_Stroker_ParseOutline(FT_Stroker stroker, FT_Outline *outline, FT_Bool opened)
Definition: ftstroke.c:2044
FT_DivFix
FT_DivFix(FT_Long a, FT_Long b)
Definition: ftcalc.c:536
FT_ARC_CUBIC_ANGLE
#define FT_ARC_CUBIC_ANGLE
Definition: ftstroke.c:521
cordic.angle2
angle2
Definition: cordic.py:50
FT_IS_SMALL
#define FT_IS_SMALL(x)
Definition: ftstroke.c:67
FT_GlyphRec_::clazz
const FT_Glyph_Class * clazz
Definition: ftglyph.h:111
FT_STROKER_LINECAP_BUTT
Definition: ftstroke.h:144
FT_OutlineGlyph
struct FT_OutlineGlyphRec_ * FT_OutlineGlyph
Definition: ftglyph.h:179
FT_Pos
FT_BEGIN_HEADER typedef signed long FT_Pos
Definition: ftimage.h:59
FT_ANGLE_PI2
#define FT_ANGLE_PI2
Definition: fttrigon.h:88
FT_StrokeBorderRec
struct FT_StrokeBorderRec_ FT_StrokeBorderRec
void
GLvoid **typedef void(GLAPIENTRY *PFNGLGETVERTEXATTRIBDVPROC)(GLuint
Definition: glew.h:1824
FT_Glyph_Class
typedefFT_BEGIN_HEADER struct FT_Glyph_Class_ FT_Glyph_Class
Definition: ftglyph.h:69
left
GLint left
Definition: glew.h:7291
FT_Stroker_Rewind
FT_Stroker_Rewind(FT_Stroker stroker)
Definition: ftstroke.c:845
FT_CURVE_TAG_CUBIC
#define FT_CURVE_TAG_CUBIC
Definition: ftimage.h:518
NULL
#define NULL
Definition: ftobjs.h:61
ft_outline_glyph_class
const FT_Glyph_Class ft_outline_glyph_class
FT_Int
signed int FT_Int
Definition: fttypes.h:216
start
GLuint start
Definition: glew.h:1239
FT_Outline_::n_contours
short n_contours
Definition: ftimage.h:385
FT_ARRAY_COPY
#define FT_ARRAY_COPY(dest, source, count)
Definition: ftmemory.h:216
FT_StrokeBorder
struct FT_StrokeBorderRec_ * FT_StrokeBorder
angle
GLdouble angle
Definition: glew.h:8396
ft_conic_split
static void ft_conic_split(FT_Vector *base)
Definition: ftstroke.c:78
FT_Err_Invalid_Argument
return FT_Err_Invalid_Argument
Definition: ftbbox.c:584
FT_Orientation
enum FT_Orientation_ FT_Orientation
n
GLclampd n
Definition: glew.h:7287
FT_Outline_::contours
short * contours
Definition: ftimage.h:390
x
EGLSurface EGLint x
Definition: eglext.h:293
FT_Tan
FT_Tan(FT_Angle angle)
Definition: fttrigon.c:358
FT_Outline_::tags
char * tags
Definition: ftimage.h:389
FT_STROKER_BORDER_LEFT
Definition: ftstroke.h:178
FT_Glyph_Copy
FT_Glyph_Copy(FT_Glyph source, FT_Glyph *target)
Definition: ftglyph.c:306
FT_Outline_
Definition: ftimage.h:383
FT_Outline_Get_Orientation
FT_Outline_Get_Orientation(FT_Outline *outline)
Definition: ftoutln.c:976
ft_stroker_arcto
static FT_Error ft_stroker_arcto(FT_Stroker stroker, FT_Int side)
Definition: ftstroke.c:876
FT_SMALL_CONIC_THRESHOLD
#define FT_SMALL_CONIC_THRESHOLD
Definition: ftstroke.c:62
a
GLboolean GLboolean GLboolean GLboolean a
Definition: glew.h:8736
library
FT_Library library
Definition: cffdrivr.c:409
ft_stroker_outside
static FT_Error ft_stroker_outside(FT_Stroker stroker, FT_Int side, FT_Fixed line_length)
Definition: ftstroke.c:1040
FT_Err_Ok
return FT_Err_Ok
Definition: ftbbox.c:658
FT_Stroker_GetBorderCounts
FT_Stroker_GetBorderCounts(FT_Stroker stroker, FT_StrokerBorder border, FT_UInt *anum_points, FT_UInt *anum_contours)
Definition: ftstroke.c:1947
ft_stroke_border_lineto
static FT_Error ft_stroke_border_lineto(FT_StrokeBorder border, FT_Vector *to, FT_Bool movable)
Definition: ftstroke.c:413
ft_stroke_border_close
static void ft_stroke_border_close(FT_StrokeBorder border, FT_Bool reverse)
Definition: ftstroke.c:347
d
return Display return Display Bool Bool int d
Definition: SDL_x11sym.h:30
FT_STROKER_LINEJOIN_MITER_VARIABLE
Definition: ftstroke.h:113
ft_pos_abs
static FT_Pos ft_pos_abs(FT_Pos x)
Definition: ftstroke.c:71
ft_stroker_subpath_start
static FT_Error ft_stroker_subpath_start(FT_Stroker stroker, FT_Angle start_angle, FT_Fixed line_length)
Definition: ftstroke.c:1239
FT_Bool
FT_BEGIN_HEADER typedef unsigned char FT_Bool
Definition: fttypes.h:104
FT_Glyph_StrokeBorder
FT_Glyph_StrokeBorder(FT_Glyph *pglyph, FT_Stroker stroker, FT_Bool inside, FT_Bool destroy)
Definition: ftstroke.c:2333
FT_Stroker_ConicTo
FT_Stroker_ConicTo(FT_Stroker stroker, FT_Vector *control, FT_Vector *to)
Definition: ftstroke.c:1353
ft_stroke_border_arcto
static FT_Error ft_stroke_border_arcto(FT_StrokeBorder border, FT_Vector *center, FT_Fixed radius, FT_Angle angle_start, FT_Angle angle_diff)
Definition: ftstroke.c:525
FT_Byte
unsigned char FT_Byte
Definition: fttypes.h:150
FT_ASSERT
#define FT_ASSERT(condition)
Definition: ftdebug.h:204
FT_STROKE_TAG_BEGIN
Definition: ftstroke.c:295
FT_GlyphRec_::library
FT_Library library
Definition: ftglyph.h:110
FT_OutlineGlyphRec_::outline
FT_Outline outline
Definition: ftglyph.h:211
FT_Vector_From_Polar
FT_Vector_From_Polar(FT_Vector *vec, FT_Fixed length, FT_Angle angle)
Definition: fttrigon.c:515
FT_FREE
#define FT_FREE(ptr)
Definition: ftmemory.h:286
first
GLint first
Definition: gl2ext.h:1011
FT_StrokeTags
enum FT_StrokeTags_ FT_StrokeTags
FT_STROKE_TAG_BEGIN_END
#define FT_STROKE_TAG_BEGIN_END
Definition: ftstroke.c:300
FT_Outline_New
FT_Outline_New(FT_Library library, FT_UInt numPoints, FT_Int numContours, FT_Outline *anoutline)
Definition: ftoutln.c:329
FT_Atan2
FT_Atan2(FT_Fixed x, FT_Fixed y)
Definition: fttrigon.c:374
FT_StrokerBorder
enum FT_StrokerBorder_ FT_StrokerBorder
FT_STROKER_BORDER_RIGHT
Definition: ftstroke.h:179
idx
FT_UInt idx
Definition: cffcmap.c:125
for
for(;;)
Definition: glslang_tab.cpp:4773
length
GLsizei GLsizei * length
Definition: gl2ext.h:792
FT_Stroker_ExportBorder
FT_Stroker_ExportBorder(FT_Stroker stroker, FT_StrokerBorder border, FT_Outline *outline)
Definition: ftstroke.c:2010
FT_MulDiv
FT_MulDiv(FT_Long a, FT_Long b, FT_Long c)
Definition: ftcalc.c:358
error
FT_Error error
Definition: cffdrivr.c:407
FT_STROKE_TAG_CUBIC
Definition: ftstroke.c:294
FT_ANGLE_PI
#define FT_ANGLE_PI
Definition: fttrigon.h:64
FT_Stroker_BeginSubPath
FT_Stroker_BeginSubPath(FT_Stroker stroker, FT_Vector *to, FT_Bool open)
Definition: ftstroke.c:1758
FT_Outline_Done
FT_Outline_Done(FT_Library library, FT_Outline *outline)
Definition: ftoutln.c:445
FT_Vector_::x
FT_Pos x
Definition: ftimage.h:77
FT_StrokerRec
struct FT_StrokerRec_ FT_StrokerRec
FT_STROKER_LINEJOIN_BEVEL
Definition: ftstroke.h:112
FT_Stroker_LineTo
FT_Stroker_LineTo(FT_Stroker stroker, FT_Vector *to)
Definition: ftstroke.c:1280
count
GLint GLsizei count
Definition: gl2ext.h:1011
ft_cubic_is_small_enough
static FT_Bool ft_cubic_is_small_enough(FT_Vector *base, FT_Angle *angle_in, FT_Angle *angle_mid, FT_Angle *angle_out)
Definition: ftstroke.c:188
ft_stroker_process_corner
static FT_Error ft_stroker_process_corner(FT_Stroker stroker, FT_Fixed line_length)
Definition: ftstroke.c:1202
ft_stroker_inside
static FT_Error ft_stroker_inside(FT_Stroker stroker, FT_Int side, FT_Fixed line_length)
Definition: ftstroke.c:978
FT_Vector_::y
FT_Pos y
Definition: ftimage.h:78
c
const GLfloat * c
Definition: glew.h:14913
FT_Sin
FT_Sin(FT_Angle angle)
Definition: fttrigon.c:349
FT_GlyphRec_
Definition: ftglyph.h:108
FT_STROKER_LINECAP_SQUARE
Definition: ftstroke.h:146
FT_Angle
FT_BEGIN_HEADER typedef FT_Fixed FT_Angle
Definition: fttrigon.h:52
FT_Stroker_EndSubPath
FT_Stroker_EndSubPath(FT_Stroker stroker)
Definition: ftstroke.c:1857
limit
GLint limit
Definition: glew.h:11829
FT_RENEW_ARRAY
#define FT_RENEW_ARRAY(ptr, curcnt, newcnt)
Definition: ftmemory.h:293
FT_Vector_
Definition: ftimage.h:75
FT_Stroker_Export
FT_Stroker_Export(FT_Stroker stroker, FT_Outline *outline)
Definition: ftstroke.c:2029
border
GLint GLenum GLsizei GLsizei GLsizei GLint border
Definition: gl2ext.h:845
ft_stroke_border_done
static void ft_stroke_border_done(FT_StrokeBorder border)
Definition: ftstroke.c:634
FT_Glyph_Stroke
FT_Glyph_Stroke(FT_Glyph *pglyph, FT_Stroker stroker, FT_Bool destroy)
Definition: ftstroke.c:2258
vec
FT_Vector * vec
Definition: ftbbox.c:579
FT_StrokeTags_
FT_StrokeTags_
Definition: ftstroke.c:291
FT_SIDE_TO_ROTATE
#define FT_SIDE_TO_ROTATE(s)
Definition: ftstroke.c:759
destroy
local int destroy(gz_stream *s)
Definition: gzio.c:355
FALSE
#define FALSE
Definition: ftobjs.h:57
FT_Cos
FT_Cos(FT_Angle angle)
Definition: fttrigon.c:333
FT_STROKE_TAG_ON
Definition: ftstroke.c:293
FT_Outline_::n_points
short n_points
Definition: ftimage.h:386
FT_LibraryRec_
Definition: ftobjs.h:824
FT_Short
signed short FT_Short
Definition: fttypes.h:194
FT_SMALL_CUBIC_THRESHOLD
#define FT_SMALL_CUBIC_THRESHOLD
Definition: ftstroke.c:63
FT_Memory
typedefFT_BEGIN_HEADER struct FT_MemoryRec_ * FT_Memory
Definition: ftsystem.h:66
FT_STROKER_LINEJOIN_ROUND
Definition: ftstroke.h:111
ft_stroke_border_reset
static void ft_stroke_border_reset(FT_StrokeBorder border)
Definition: ftstroke.c:625
FT_BOOL
#define FT_BOOL(x)
Definition: fttypes.h:581
FT_Stroker_Set
FT_Stroker_Set(FT_Stroker stroker, FT_Fixed radius, FT_Stroker_LineCap line_cap, FT_Stroker_LineJoin line_join, FT_Fixed miter_limit)
Definition: ftstroke.c:819
FT_Stroker_LineJoin
enum FT_Stroker_LineJoin_ FT_Stroker_LineJoin
FT_Stroker_CubicTo
FT_Stroker_CubicTo(FT_Stroker stroker, FT_Vector *control1, FT_Vector *control2, FT_Vector *to)
Definition: ftstroke.c:1548
y
EGLSurface EGLint EGLint y
Definition: eglext.h:293
FT_MulFix
FT_MulFix(FT_Long a, FT_Long b)
Definition: ftcalc.c:435
FT_Outline_GetInsideBorder
FT_Outline_GetInsideBorder(FT_Outline *outline)
Definition: ftstroke.c:31
FT_Outline_Check
FT_Outline_Check(FT_Outline *outline)
Definition: ftoutln.c:345
FT_OUTLINE_GLYPH_CLASS_GET
#define FT_OUTLINE_GLYPH_CLASS_GET
Definition: basepic.h:28
ft_angle_mean
static FT_Angle ft_angle_mean(FT_Angle angle1, FT_Angle angle2)
Definition: ftstroke.c:180
ft_stroke_border_cubicto
static FT_Error ft_stroke_border_cubicto(FT_StrokeBorder border, FT_Vector *control1, FT_Vector *control2, FT_Vector *to)
Definition: ftstroke.c:487
ft2build.h
FT_Fixed
signed long FT_Fixed
Definition: fttypes.h:284
ft_conic_is_small_enough
static FT_Bool ft_conic_is_small_enough(FT_Vector *base, FT_Angle *angle_in, FT_Angle *angle_out)
Definition: ftstroke.c:98
FT_OutlineGlyphRec_
Definition: ftglyph.h:208
FT_Angle_Diff
FT_Angle_Diff(FT_Angle angle1, FT_Angle angle2)
Definition: fttrigon.c:529
FT_STROKER_LINECAP_ROUND
Definition: ftstroke.h:145
FT_EXPORT_DEF
#define FT_EXPORT_DEF(x)
Definition: ftconfig.h:511
FT_UInt
unsigned int FT_UInt
Definition: fttypes.h:227
FT_Stroker_Done
FT_Stroker_Done(FT_Stroker stroker)
Definition: ftstroke.c:858
ft_stroke_border_get_counts
static FT_Error ft_stroke_border_get_counts(FT_StrokeBorder border, FT_UInt *anum_points, FT_UInt *anum_contours)
Definition: ftstroke.c:650
ft_stroke_border_export
static void ft_stroke_border_export(FT_StrokeBorder border, FT_Outline *outline)
Definition: ftstroke.c:701
FT_STROKE_TAG_END
Definition: ftstroke.c:296
ft_stroker_cap
static FT_Error ft_stroker_cap(FT_Stroker stroker, FT_Angle angle, FT_Int side)
Definition: ftstroke.c:903
b
GLdouble GLdouble GLdouble b
Definition: glew.h:8383
end
GLuint GLuint end
Definition: glew.h:1239
FT_Stroker_New
FT_Stroker_New(FT_Library library, FT_Stroker *astroker)
Definition: ftstroke.c:789
FT_Stroker
typedefFT_BEGIN_HEADER struct FT_StrokerRec_ * FT_Stroker
Definition: ftstroke.h:60
FT_Outline_GetOutsideBorder
FT_Outline_GetOutsideBorder(FT_Outline *outline)
Definition: ftstroke.c:44
FT_Vector_Length
FT_Vector_Length(FT_Vector *vec)
Definition: fttrigon.c:455
basepic.h
FT_CURVE_TAG_ON
#define FT_CURVE_TAG_ON
Definition: ftimage.h:516
points
GLuint GLdouble GLdouble GLint GLint const GLdouble * points
Definition: glew.h:3337
FT_CURVE_TAG_CONIC
#define FT_CURVE_TAG_CONIC
Definition: ftimage.h:517
ft_stroke_border_moveto
static FT_Error ft_stroke_border_moveto(FT_StrokeBorder border, FT_Vector *to)
Definition: ftstroke.c:595
FT_NEW
#define FT_NEW(ptr)
Definition: ftmemory.h:288
ft_cubic_split
static void ft_cubic_split(FT_Vector *base)
Definition: ftstroke.c:149
right
GLfloat right
Definition: glew.h:13816
FT_CURVE_TAG
#define FT_CURVE_TAG(flag)
Definition: ftimage.h:514
FT_Stroker_GetCounts
FT_Stroker_GetCounts(FT_Stroker stroker, FT_UInt *anum_points, FT_UInt *anum_contours)
Definition: ftstroke.c:1978
ft_stroke_border_conicto
static FT_Error ft_stroke_border_conicto(FT_StrokeBorder border, FT_Vector *control, FT_Vector *to)
Definition: ftstroke.c:455
FT_Done_Glyph
FT_Done_Glyph(FT_Glyph glyph)
Definition: ftglyph.c:611
FT_UNUSED
#define FT_UNUSED(arg)
Definition: ftconfig.h:101
TRUE
#define TRUE
Definition: ftobjs.h:53
FT_Outline_::points
FT_Vector * points
Definition: ftimage.h:388
ft_stroke_border_grow
static FT_Error ft_stroke_border_grow(FT_StrokeBorder border, FT_UInt new_points)
Definition: ftstroke.c:317
FT_Err_Invalid_Outline
return FT_Err_Invalid_Outline
Definition: ftbbox.c:587
ft_stroker_add_reverse_left
static FT_Error ft_stroker_add_reverse_left(FT_Stroker stroker, FT_Bool open)
Definition: ftstroke.c:1790
ft_stroke_border_init
static void ft_stroke_border_init(FT_StrokeBorder border, FT_Memory memory)
Definition: ftstroke.c:610