File: | base/ftstroke.c |
Location: | line 1745, column 11 |
Description: | Value stored to 'v_last' is never read |
1 | /***************************************************************************/ |
2 | /* */ |
3 | /* ftstroke.c */ |
4 | /* */ |
5 | /* FreeType path stroker (body). */ |
6 | /* */ |
7 | /* Copyright 2002, 2003, 2004, 2005, 2006, 2008, 2009 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<freetype/ftstroke.h> |
21 | #include FT_TRIGONOMETRY_H<freetype/fttrigon.h> |
22 | #include FT_OUTLINE_H<freetype/ftoutln.h> |
23 | #include FT_INTERNAL_MEMORY_H<freetype/internal/ftmemory.h> |
24 | #include FT_INTERNAL_DEBUG_H<freetype/internal/ftdebug.h> |
25 | #include FT_INTERNAL_OBJECTS_H<freetype/internal/ftobjs.h> |
26 | |
27 | |
28 | /* documentation is in ftstroke.h */ |
29 | |
30 | FT_EXPORT_DEF( FT_StrokerBorder )extern 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 )extern 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( ( 180L << 16 ) / 6 ) ( FT_ANGLE_PI( 180L << 16 ) / 6 ) |
63 | #define FT_SMALL_CUBIC_THRESHOLD( ( 180L << 16 ) / 6 ) ( FT_ANGLE_PI( 180L << 16 ) / 6 ) |
64 | #define FT_EPSILON2 2 |
65 | |
66 | #define FT_IS_SMALL( x )( (x) > -2 && (x) < 2 ) ( (x) > -FT_EPSILON2 && (x) < FT_EPSILON2 ) |
67 | |
68 | |
69 | static FT_Pos |
70 | ft_pos_abs( FT_Pos x ) |
71 | { |
72 | return x >= 0 ? x : -x ; |
73 | } |
74 | |
75 | |
76 | static void |
77 | ft_conic_split( FT_Vector* base ) |
78 | { |
79 | FT_Pos a, b; |
80 | |
81 | |
82 | base[4].x = base[2].x; |
83 | b = base[1].x; |
84 | a = base[3].x = ( base[2].x + b ) / 2; |
85 | b = base[1].x = ( base[0].x + b ) / 2; |
86 | base[2].x = ( a + b ) / 2; |
87 | |
88 | base[4].y = base[2].y; |
89 | b = base[1].y; |
90 | a = base[3].y = ( base[2].y + b ) / 2; |
91 | b = base[1].y = ( base[0].y + b ) / 2; |
92 | base[2].y = ( a + b ) / 2; |
93 | } |
94 | |
95 | |
96 | static FT_Bool |
97 | ft_conic_is_small_enough( FT_Vector* base, |
98 | FT_Angle *angle_in, |
99 | FT_Angle *angle_out ) |
100 | { |
101 | FT_Vector d1, d2; |
102 | FT_Angle theta; |
103 | FT_Int close1, close2; |
104 | |
105 | |
106 | d1.x = base[1].x - base[2].x; |
107 | d1.y = base[1].y - base[2].y; |
108 | d2.x = base[0].x - base[1].x; |
109 | d2.y = base[0].y - base[1].y; |
110 | |
111 | close1 = FT_IS_SMALL( d1.x )( (d1.x) > -2 && (d1.x) < 2 ) && FT_IS_SMALL( d1.y )( (d1.y) > -2 && (d1.y) < 2 ); |
112 | close2 = FT_IS_SMALL( d2.x )( (d2.x) > -2 && (d2.x) < 2 ) && FT_IS_SMALL( d2.y )( (d2.y) > -2 && (d2.y) < 2 ); |
113 | |
114 | if ( close1 ) |
115 | { |
116 | if ( close2 ) |
117 | *angle_in = *angle_out = 0; |
118 | else |
119 | *angle_in = *angle_out = FT_Atan2( d2.x, d2.y ); |
120 | } |
121 | else if ( close2 ) |
122 | { |
123 | *angle_in = *angle_out = FT_Atan2( d1.x, d1.y ); |
124 | } |
125 | else |
126 | { |
127 | *angle_in = FT_Atan2( d1.x, d1.y ); |
128 | *angle_out = FT_Atan2( d2.x, d2.y ); |
129 | } |
130 | |
131 | theta = ft_pos_abs( FT_Angle_Diff( *angle_in, *angle_out ) ); |
132 | |
133 | return FT_BOOL( theta < FT_SMALL_CONIC_THRESHOLD )( (FT_Bool)( theta < ( ( 180L << 16 ) / 6 ) ) ); |
134 | } |
135 | |
136 | |
137 | static void |
138 | ft_cubic_split( FT_Vector* base ) |
139 | { |
140 | FT_Pos a, b, c, d; |
141 | |
142 | |
143 | base[6].x = base[3].x; |
144 | c = base[1].x; |
145 | d = base[2].x; |
146 | base[1].x = a = ( base[0].x + c ) / 2; |
147 | base[5].x = b = ( base[3].x + d ) / 2; |
148 | c = ( c + d ) / 2; |
149 | base[2].x = a = ( a + c ) / 2; |
150 | base[4].x = b = ( b + c ) / 2; |
151 | base[3].x = ( a + b ) / 2; |
152 | |
153 | base[6].y = base[3].y; |
154 | c = base[1].y; |
155 | d = base[2].y; |
156 | base[1].y = a = ( base[0].y + c ) / 2; |
157 | base[5].y = b = ( base[3].y + d ) / 2; |
158 | c = ( c + d ) / 2; |
159 | base[2].y = a = ( a + c ) / 2; |
160 | base[4].y = b = ( b + c ) / 2; |
161 | base[3].y = ( a + b ) / 2; |
162 | } |
163 | |
164 | |
165 | static FT_Bool |
166 | ft_cubic_is_small_enough( FT_Vector* base, |
167 | FT_Angle *angle_in, |
168 | FT_Angle *angle_mid, |
169 | FT_Angle *angle_out ) |
170 | { |
171 | FT_Vector d1, d2, d3; |
172 | FT_Angle theta1, theta2; |
173 | FT_Int close1, close2, close3; |
174 | |
175 | |
176 | d1.x = base[2].x - base[3].x; |
177 | d1.y = base[2].y - base[3].y; |
178 | d2.x = base[1].x - base[2].x; |
179 | d2.y = base[1].y - base[2].y; |
180 | d3.x = base[0].x - base[1].x; |
181 | d3.y = base[0].y - base[1].y; |
182 | |
183 | close1 = FT_IS_SMALL( d1.x )( (d1.x) > -2 && (d1.x) < 2 ) && FT_IS_SMALL( d1.y )( (d1.y) > -2 && (d1.y) < 2 ); |
184 | close2 = FT_IS_SMALL( d2.x )( (d2.x) > -2 && (d2.x) < 2 ) && FT_IS_SMALL( d2.y )( (d2.y) > -2 && (d2.y) < 2 ); |
185 | close3 = FT_IS_SMALL( d3.x )( (d3.x) > -2 && (d3.x) < 2 ) && FT_IS_SMALL( d3.y )( (d3.y) > -2 && (d3.y) < 2 ); |
186 | |
187 | if ( close1 || close3 ) |
188 | { |
189 | if ( close2 ) |
190 | { |
191 | /* basically a point */ |
192 | *angle_in = *angle_out = *angle_mid = 0; |
193 | } |
194 | else if ( close1 ) |
195 | { |
196 | *angle_in = *angle_mid = FT_Atan2( d2.x, d2.y ); |
197 | *angle_out = FT_Atan2( d3.x, d3.y ); |
198 | } |
199 | else /* close2 */ |
200 | { |
201 | *angle_in = FT_Atan2( d1.x, d1.y ); |
202 | *angle_mid = *angle_out = FT_Atan2( d2.x, d2.y ); |
203 | } |
204 | } |
205 | else if ( close2 ) |
206 | { |
207 | *angle_in = *angle_mid = FT_Atan2( d1.x, d1.y ); |
208 | *angle_out = FT_Atan2( d3.x, d3.y ); |
209 | } |
210 | else |
211 | { |
212 | *angle_in = FT_Atan2( d1.x, d1.y ); |
213 | *angle_mid = FT_Atan2( d2.x, d2.y ); |
214 | *angle_out = FT_Atan2( d3.x, d3.y ); |
215 | } |
216 | |
217 | theta1 = ft_pos_abs( FT_Angle_Diff( *angle_in, *angle_mid ) ); |
218 | theta2 = ft_pos_abs( FT_Angle_Diff( *angle_mid, *angle_out ) ); |
219 | |
220 | return FT_BOOL( theta1 < FT_SMALL_CUBIC_THRESHOLD &&( (FT_Bool)( theta1 < ( ( 180L << 16 ) / 6 ) && theta2 < ( ( 180L << 16 ) / 6 ) ) ) |
221 | theta2 < FT_SMALL_CUBIC_THRESHOLD )( (FT_Bool)( theta1 < ( ( 180L << 16 ) / 6 ) && theta2 < ( ( 180L << 16 ) / 6 ) ) ); |
222 | } |
223 | |
224 | |
225 | /***************************************************************************/ |
226 | /***************************************************************************/ |
227 | /***** *****/ |
228 | /***** STROKE BORDERS *****/ |
229 | /***** *****/ |
230 | /***************************************************************************/ |
231 | /***************************************************************************/ |
232 | |
233 | typedef enum FT_StrokeTags_ |
234 | { |
235 | FT_STROKE_TAG_ON = 1, /* on-curve point */ |
236 | FT_STROKE_TAG_CUBIC = 2, /* cubic off-point */ |
237 | FT_STROKE_TAG_BEGIN = 4, /* sub-path start */ |
238 | FT_STROKE_TAG_END = 8 /* sub-path end */ |
239 | |
240 | } FT_StrokeTags; |
241 | |
242 | #define FT_STROKE_TAG_BEGIN_END(FT_STROKE_TAG_BEGIN|FT_STROKE_TAG_END) (FT_STROKE_TAG_BEGIN|FT_STROKE_TAG_END) |
243 | |
244 | typedef struct FT_StrokeBorderRec_ |
245 | { |
246 | FT_UInt num_points; |
247 | FT_UInt max_points; |
248 | FT_Vector* points; |
249 | FT_Byte* tags; |
250 | FT_Bool movable; |
251 | FT_Int start; /* index of current sub-path start point */ |
252 | FT_Memory memory; |
253 | FT_Bool valid; |
254 | |
255 | } FT_StrokeBorderRec, *FT_StrokeBorder; |
256 | |
257 | |
258 | static FT_Error |
259 | ft_stroke_border_grow( FT_StrokeBorder border, |
260 | FT_UInt new_points ) |
261 | { |
262 | FT_UInt old_max = border->max_points; |
263 | FT_UInt new_max = border->num_points + new_points; |
264 | FT_Error error = FT_Err_Ok; |
265 | |
266 | |
267 | if ( new_max > old_max ) |
268 | { |
269 | FT_UInt cur_max = old_max; |
270 | FT_Memory memory = border->memory; |
271 | |
272 | |
273 | while ( cur_max < new_max ) |
274 | cur_max += ( cur_max >> 1 ) + 16; |
275 | |
276 | if ( FT_RENEW_ARRAY( border->points, old_max, cur_max )( ((border->points) = (ft_mem_realloc( memory, sizeof ( *( border->points) ), (old_max), (cur_max), (border->points ), &error ))), error != 0 ) || |
277 | FT_RENEW_ARRAY( border->tags, old_max, cur_max )( ((border->tags) = (ft_mem_realloc( memory, sizeof ( *(border ->tags) ), (old_max), (cur_max), (border->tags), &error ))), error != 0 ) ) |
278 | goto Exit; |
279 | |
280 | border->max_points = cur_max; |
281 | } |
282 | |
283 | Exit: |
284 | return error; |
285 | } |
286 | |
287 | |
288 | static void |
289 | ft_stroke_border_close( FT_StrokeBorder border, |
290 | FT_Bool reverse ) |
291 | { |
292 | FT_UInt start = border->start; |
293 | FT_UInt count = border->num_points; |
294 | |
295 | |
296 | FT_ASSERT( border->start >= 0 )do { } while ( 0 ); |
297 | |
298 | /* don't record empty paths! */ |
299 | if ( count <= start + 1U ) |
300 | border->num_points = start; |
301 | else |
302 | { |
303 | /* copy the last point to the start of this sub-path, since */ |
304 | /* it contains the `adjusted' starting coordinates */ |
305 | border->num_points = --count; |
306 | border->points[start] = border->points[count]; |
307 | |
308 | if ( reverse ) |
309 | { |
310 | /* reverse the points */ |
311 | { |
312 | FT_Vector* vec1 = border->points + start + 1; |
313 | FT_Vector* vec2 = border->points + count - 1; |
314 | |
315 | |
316 | for ( ; vec1 < vec2; vec1++, vec2-- ) |
317 | { |
318 | FT_Vector tmp; |
319 | |
320 | |
321 | tmp = *vec1; |
322 | *vec1 = *vec2; |
323 | *vec2 = tmp; |
324 | } |
325 | } |
326 | |
327 | /* then the tags */ |
328 | { |
329 | FT_Byte* tag1 = border->tags + start + 1; |
330 | FT_Byte* tag2 = border->tags + count - 1; |
331 | |
332 | |
333 | for ( ; tag1 < tag2; tag1++, tag2-- ) |
334 | { |
335 | FT_Byte tmp; |
336 | |
337 | |
338 | tmp = *tag1; |
339 | *tag1 = *tag2; |
340 | *tag2 = tmp; |
341 | } |
342 | } |
343 | } |
344 | |
345 | border->tags[start ] |= FT_STROKE_TAG_BEGIN; |
346 | border->tags[count - 1] |= FT_STROKE_TAG_END; |
347 | } |
348 | |
349 | border->start = -1; |
350 | border->movable = FALSE0; |
351 | } |
352 | |
353 | |
354 | static FT_Error |
355 | ft_stroke_border_lineto( FT_StrokeBorder border, |
356 | FT_Vector* to, |
357 | FT_Bool movable ) |
358 | { |
359 | FT_Error error = FT_Err_Ok; |
360 | |
361 | |
362 | FT_ASSERT( border->start >= 0 )do { } while ( 0 ); |
363 | |
364 | if ( border->movable ) |
365 | { |
366 | /* move last point */ |
367 | border->points[border->num_points - 1] = *to; |
368 | } |
369 | else |
370 | { |
371 | /* add one point */ |
372 | error = ft_stroke_border_grow( border, 1 ); |
373 | if ( !error ) |
374 | { |
375 | FT_Vector* vec = border->points + border->num_points; |
376 | FT_Byte* tag = border->tags + border->num_points; |
377 | |
378 | |
379 | vec[0] = *to; |
380 | tag[0] = FT_STROKE_TAG_ON; |
381 | |
382 | border->num_points += 1; |
383 | } |
384 | } |
385 | border->movable = movable; |
386 | return error; |
387 | } |
388 | |
389 | |
390 | static FT_Error |
391 | ft_stroke_border_conicto( FT_StrokeBorder border, |
392 | FT_Vector* control, |
393 | FT_Vector* to ) |
394 | { |
395 | FT_Error error; |
396 | |
397 | |
398 | FT_ASSERT( border->start >= 0 )do { } while ( 0 ); |
399 | |
400 | error = ft_stroke_border_grow( border, 2 ); |
401 | if ( !error ) |
402 | { |
403 | FT_Vector* vec = border->points + border->num_points; |
404 | FT_Byte* tag = border->tags + border->num_points; |
405 | |
406 | vec[0] = *control; |
407 | vec[1] = *to; |
408 | |
409 | tag[0] = 0; |
410 | tag[1] = FT_STROKE_TAG_ON; |
411 | |
412 | border->num_points += 2; |
413 | } |
414 | border->movable = FALSE0; |
415 | return error; |
416 | } |
417 | |
418 | |
419 | static FT_Error |
420 | ft_stroke_border_cubicto( FT_StrokeBorder border, |
421 | FT_Vector* control1, |
422 | FT_Vector* control2, |
423 | FT_Vector* to ) |
424 | { |
425 | FT_Error error; |
426 | |
427 | |
428 | FT_ASSERT( border->start >= 0 )do { } while ( 0 ); |
429 | |
430 | error = ft_stroke_border_grow( border, 3 ); |
431 | if ( !error ) |
432 | { |
433 | FT_Vector* vec = border->points + border->num_points; |
434 | FT_Byte* tag = border->tags + border->num_points; |
435 | |
436 | |
437 | vec[0] = *control1; |
438 | vec[1] = *control2; |
439 | vec[2] = *to; |
440 | |
441 | tag[0] = FT_STROKE_TAG_CUBIC; |
442 | tag[1] = FT_STROKE_TAG_CUBIC; |
443 | tag[2] = FT_STROKE_TAG_ON; |
444 | |
445 | border->num_points += 3; |
446 | } |
447 | border->movable = FALSE0; |
448 | return error; |
449 | } |
450 | |
451 | |
452 | #define FT_ARC_CUBIC_ANGLE( ( 180L << 16 ) / 2 ) ( FT_ANGLE_PI( 180L << 16 ) / 2 ) |
453 | |
454 | |
455 | static FT_Error |
456 | ft_stroke_border_arcto( FT_StrokeBorder border, |
457 | FT_Vector* center, |
458 | FT_Fixed radius, |
459 | FT_Angle angle_start, |
460 | FT_Angle angle_diff ) |
461 | { |
462 | FT_Angle total, angle, step, rotate, next, theta; |
463 | FT_Vector a, b, a2, b2; |
464 | FT_Fixed length; |
465 | FT_Error error = FT_Err_Ok; |
466 | |
467 | |
468 | /* compute start point */ |
469 | FT_Vector_From_Polar( &a, radius, angle_start ); |
470 | a.x += center->x; |
471 | a.y += center->y; |
472 | |
473 | total = angle_diff; |
474 | angle = angle_start; |
475 | rotate = ( angle_diff >= 0 ) ? FT_ANGLE_PI2( ( 180L << 16 ) / 2 ) : -FT_ANGLE_PI2( ( 180L << 16 ) / 2 ); |
476 | |
477 | while ( total != 0 ) |
478 | { |
479 | step = total; |
480 | if ( step > FT_ARC_CUBIC_ANGLE( ( 180L << 16 ) / 2 ) ) |
481 | step = FT_ARC_CUBIC_ANGLE( ( 180L << 16 ) / 2 ); |
482 | |
483 | else if ( step < -FT_ARC_CUBIC_ANGLE( ( 180L << 16 ) / 2 ) ) |
484 | step = -FT_ARC_CUBIC_ANGLE( ( 180L << 16 ) / 2 ); |
485 | |
486 | next = angle + step; |
487 | theta = step; |
488 | if ( theta < 0 ) |
489 | theta = -theta; |
490 | |
491 | theta >>= 1; |
492 | |
493 | /* compute end point */ |
494 | FT_Vector_From_Polar( &b, radius, next ); |
495 | b.x += center->x; |
496 | b.y += center->y; |
497 | |
498 | /* compute first and second control points */ |
499 | length = FT_MulDiv( radius, FT_Sin( theta ) * 4, |
500 | ( 0x10000L + FT_Cos( theta ) ) * 3 ); |
501 | |
502 | FT_Vector_From_Polar( &a2, length, angle + rotate ); |
503 | a2.x += a.x; |
504 | a2.y += a.y; |
505 | |
506 | FT_Vector_From_Polar( &b2, length, next - rotate ); |
507 | b2.x += b.x; |
508 | b2.y += b.y; |
509 | |
510 | /* add cubic arc */ |
511 | error = ft_stroke_border_cubicto( border, &a2, &b2, &b ); |
512 | if ( error ) |
513 | break; |
514 | |
515 | /* process the rest of the arc ?? */ |
516 | a = b; |
517 | total -= step; |
518 | angle = next; |
519 | } |
520 | |
521 | return error; |
522 | } |
523 | |
524 | |
525 | static FT_Error |
526 | ft_stroke_border_moveto( FT_StrokeBorder border, |
527 | FT_Vector* to ) |
528 | { |
529 | /* close current open path if any ? */ |
530 | if ( border->start >= 0 ) |
531 | ft_stroke_border_close( border, FALSE0 ); |
532 | |
533 | border->start = border->num_points; |
534 | border->movable = FALSE0; |
535 | |
536 | return ft_stroke_border_lineto( border, to, FALSE0 ); |
537 | } |
538 | |
539 | |
540 | static void |
541 | ft_stroke_border_init( FT_StrokeBorder border, |
542 | FT_Memory memory ) |
543 | { |
544 | border->memory = memory; |
545 | border->points = NULL((void*)0); |
546 | border->tags = NULL((void*)0); |
547 | |
548 | border->num_points = 0; |
549 | border->max_points = 0; |
550 | border->start = -1; |
551 | border->valid = FALSE0; |
552 | } |
553 | |
554 | |
555 | static void |
556 | ft_stroke_border_reset( FT_StrokeBorder border ) |
557 | { |
558 | border->num_points = 0; |
559 | border->start = -1; |
560 | border->valid = FALSE0; |
561 | } |
562 | |
563 | |
564 | static void |
565 | ft_stroke_border_done( FT_StrokeBorder border ) |
566 | { |
567 | FT_Memory memory = border->memory; |
568 | |
569 | |
570 | FT_FREE( border->points )do { ft_mem_free( memory, (border->points) ); (border-> points) = ((void*)0); } while ( 0 ); |
571 | FT_FREE( border->tags )do { ft_mem_free( memory, (border->tags) ); (border->tags ) = ((void*)0); } while ( 0 ); |
572 | |
573 | border->num_points = 0; |
574 | border->max_points = 0; |
575 | border->start = -1; |
576 | border->valid = FALSE0; |
577 | } |
578 | |
579 | |
580 | static FT_Error |
581 | ft_stroke_border_get_counts( FT_StrokeBorder border, |
582 | FT_UInt *anum_points, |
583 | FT_UInt *anum_contours ) |
584 | { |
585 | FT_Error error = FT_Err_Ok; |
586 | FT_UInt num_points = 0; |
587 | FT_UInt num_contours = 0; |
588 | |
589 | FT_UInt count = border->num_points; |
590 | FT_Vector* point = border->points; |
591 | FT_Byte* tags = border->tags; |
592 | FT_Int in_contour = 0; |
593 | |
594 | |
595 | for ( ; count > 0; count--, num_points++, point++, tags++ ) |
596 | { |
597 | if ( tags[0] & FT_STROKE_TAG_BEGIN ) |
598 | { |
599 | if ( in_contour != 0 ) |
600 | goto Fail; |
601 | |
602 | in_contour = 1; |
603 | } |
604 | else if ( in_contour == 0 ) |
605 | goto Fail; |
606 | |
607 | if ( tags[0] & FT_STROKE_TAG_END ) |
608 | { |
609 | in_contour = 0; |
610 | num_contours++; |
611 | } |
612 | } |
613 | |
614 | if ( in_contour != 0 ) |
615 | goto Fail; |
616 | |
617 | border->valid = TRUE1; |
618 | |
619 | Exit: |
620 | *anum_points = num_points; |
621 | *anum_contours = num_contours; |
622 | return error; |
623 | |
624 | Fail: |
625 | num_points = 0; |
626 | num_contours = 0; |
627 | goto Exit; |
628 | } |
629 | |
630 | |
631 | static void |
632 | ft_stroke_border_export( FT_StrokeBorder border, |
633 | FT_Outline* outline ) |
634 | { |
635 | /* copy point locations */ |
636 | FT_ARRAY_COPY( outline->points + outline->n_points,((__builtin_object_size (outline->points + outline->n_points , 0) != (size_t) -1) ? __builtin___memcpy_chk (outline->points + outline->n_points, border->points, (border->num_points ) * sizeof ( *(outline->points + outline->n_points) ), __builtin_object_size (outline->points + outline->n_points, 0)) : __inline_memcpy_chk (outline->points + outline->n_points, border->points , (border->num_points) * sizeof ( *(outline->points + outline ->n_points) ))) |
637 | border->points,((__builtin_object_size (outline->points + outline->n_points , 0) != (size_t) -1) ? __builtin___memcpy_chk (outline->points + outline->n_points, border->points, (border->num_points ) * sizeof ( *(outline->points + outline->n_points) ), __builtin_object_size (outline->points + outline->n_points, 0)) : __inline_memcpy_chk (outline->points + outline->n_points, border->points , (border->num_points) * sizeof ( *(outline->points + outline ->n_points) ))) |
638 | border->num_points )((__builtin_object_size (outline->points + outline->n_points , 0) != (size_t) -1) ? __builtin___memcpy_chk (outline->points + outline->n_points, border->points, (border->num_points ) * sizeof ( *(outline->points + outline->n_points) ), __builtin_object_size (outline->points + outline->n_points, 0)) : __inline_memcpy_chk (outline->points + outline->n_points, border->points , (border->num_points) * sizeof ( *(outline->points + outline ->n_points) ))); |
639 | |
640 | /* copy tags */ |
641 | { |
642 | FT_UInt count = border->num_points; |
643 | FT_Byte* read = border->tags; |
644 | FT_Byte* write = (FT_Byte*)outline->tags + outline->n_points; |
645 | |
646 | |
647 | for ( ; count > 0; count--, read++, write++ ) |
648 | { |
649 | if ( *read & FT_STROKE_TAG_ON ) |
650 | *write = FT_CURVE_TAG_ON1; |
651 | else if ( *read & FT_STROKE_TAG_CUBIC ) |
652 | *write = FT_CURVE_TAG_CUBIC2; |
653 | else |
654 | *write = FT_CURVE_TAG_CONIC0; |
655 | } |
656 | } |
657 | |
658 | /* copy contours */ |
659 | { |
660 | FT_UInt count = border->num_points; |
661 | FT_Byte* tags = border->tags; |
662 | FT_Short* write = outline->contours + outline->n_contours; |
663 | FT_Short idx = (FT_Short)outline->n_points; |
664 | |
665 | |
666 | for ( ; count > 0; count--, tags++, idx++ ) |
667 | { |
668 | if ( *tags & FT_STROKE_TAG_END ) |
669 | { |
670 | *write++ = idx; |
671 | outline->n_contours++; |
672 | } |
673 | } |
674 | } |
675 | |
676 | outline->n_points = (short)( outline->n_points + border->num_points ); |
677 | |
678 | FT_ASSERT( FT_Outline_Check( outline ) == 0 )do { } while ( 0 ); |
679 | } |
680 | |
681 | |
682 | /***************************************************************************/ |
683 | /***************************************************************************/ |
684 | /***** *****/ |
685 | /***** STROKER *****/ |
686 | /***** *****/ |
687 | /***************************************************************************/ |
688 | /***************************************************************************/ |
689 | |
690 | #define FT_SIDE_TO_ROTATE( s )( ( ( 180L << 16 ) / 2 ) - (s) * ( 180L << 16 ) ) ( FT_ANGLE_PI2( ( 180L << 16 ) / 2 ) - (s) * FT_ANGLE_PI( 180L << 16 ) ) |
691 | |
692 | typedef struct FT_StrokerRec_ |
693 | { |
694 | FT_Angle angle_in; |
695 | FT_Angle angle_out; |
696 | FT_Vector center; |
697 | FT_Bool first_point; |
698 | FT_Bool subpath_open; |
699 | FT_Angle subpath_angle; |
700 | FT_Vector subpath_start; |
701 | |
702 | FT_Stroker_LineCap line_cap; |
703 | FT_Stroker_LineJoin line_join; |
704 | FT_Fixed miter_limit; |
705 | FT_Fixed radius; |
706 | |
707 | FT_Bool valid; |
708 | FT_StrokeBorderRec borders[2]; |
709 | FT_Library library; |
710 | |
711 | } FT_StrokerRec; |
712 | |
713 | |
714 | /* documentation is in ftstroke.h */ |
715 | |
716 | FT_EXPORT_DEF( FT_Error )extern FT_Error |
717 | FT_Stroker_New( FT_Library library, |
718 | FT_Stroker *astroker ) |
719 | { |
720 | FT_Error error; |
721 | FT_Memory memory; |
722 | FT_Stroker stroker; |
723 | |
724 | |
725 | if ( !library ) |
726 | return FT_Err_Invalid_Argument; |
727 | |
728 | memory = library->memory; |
729 | |
730 | if ( !FT_NEW( stroker )( ((stroker) = (ft_mem_alloc( memory, (sizeof ( *(stroker) )) , &error ))), error != 0 ) ) |
731 | { |
732 | stroker->library = library; |
733 | |
734 | ft_stroke_border_init( &stroker->borders[0], memory ); |
735 | ft_stroke_border_init( &stroker->borders[1], memory ); |
736 | } |
737 | *astroker = stroker; |
738 | return error; |
739 | } |
740 | |
741 | |
742 | /* documentation is in ftstroke.h */ |
743 | |
744 | FT_EXPORT_DEF( void )extern void |
745 | FT_Stroker_Set( FT_Stroker stroker, |
746 | FT_Fixed radius, |
747 | FT_Stroker_LineCap line_cap, |
748 | FT_Stroker_LineJoin line_join, |
749 | FT_Fixed miter_limit ) |
750 | { |
751 | stroker->radius = radius; |
752 | stroker->line_cap = line_cap; |
753 | stroker->line_join = line_join; |
754 | stroker->miter_limit = miter_limit; |
755 | |
756 | FT_Stroker_Rewind( stroker ); |
757 | } |
758 | |
759 | |
760 | /* documentation is in ftstroke.h */ |
761 | |
762 | FT_EXPORT_DEF( void )extern void |
763 | FT_Stroker_Rewind( FT_Stroker stroker ) |
764 | { |
765 | if ( stroker ) |
766 | { |
767 | ft_stroke_border_reset( &stroker->borders[0] ); |
768 | ft_stroke_border_reset( &stroker->borders[1] ); |
769 | } |
770 | } |
771 | |
772 | |
773 | /* documentation is in ftstroke.h */ |
774 | |
775 | FT_EXPORT_DEF( void )extern void |
776 | FT_Stroker_Done( FT_Stroker stroker ) |
777 | { |
778 | if ( stroker ) |
779 | { |
780 | FT_Memory memory = stroker->library->memory; |
781 | |
782 | |
783 | ft_stroke_border_done( &stroker->borders[0] ); |
784 | ft_stroke_border_done( &stroker->borders[1] ); |
785 | |
786 | stroker->library = NULL((void*)0); |
787 | FT_FREE( stroker )do { ft_mem_free( memory, (stroker) ); (stroker) = ((void*)0) ; } while ( 0 ); |
788 | } |
789 | } |
790 | |
791 | |
792 | /* creates a circular arc at a corner or cap */ |
793 | static FT_Error |
794 | ft_stroker_arcto( FT_Stroker stroker, |
795 | FT_Int side ) |
796 | { |
797 | FT_Angle total, rotate; |
798 | FT_Fixed radius = stroker->radius; |
799 | FT_Error error = FT_Err_Ok; |
800 | FT_StrokeBorder border = stroker->borders + side; |
801 | |
802 | |
803 | rotate = FT_SIDE_TO_ROTATE( side )( ( ( 180L << 16 ) / 2 ) - (side) * ( 180L << 16 ) ); |
804 | |
805 | total = FT_Angle_Diff( stroker->angle_in, stroker->angle_out ); |
806 | if ( total == FT_ANGLE_PI( 180L << 16 ) ) |
807 | total = -rotate * 2; |
808 | |
809 | error = ft_stroke_border_arcto( border, |
810 | &stroker->center, |
811 | radius, |
812 | stroker->angle_in + rotate, |
813 | total ); |
814 | border->movable = FALSE0; |
815 | return error; |
816 | } |
817 | |
818 | |
819 | /* adds a cap at the end of an opened path */ |
820 | static FT_Error |
821 | ft_stroker_cap( FT_Stroker stroker, |
822 | FT_Angle angle, |
823 | FT_Int side ) |
824 | { |
825 | FT_Error error = FT_Err_Ok; |
826 | |
827 | |
828 | if ( stroker->line_cap == FT_STROKER_LINECAP_ROUND ) |
829 | { |
830 | /* add a round cap */ |
831 | stroker->angle_in = angle; |
832 | stroker->angle_out = angle + FT_ANGLE_PI( 180L << 16 ); |
833 | error = ft_stroker_arcto( stroker, side ); |
834 | } |
835 | else if ( stroker->line_cap == FT_STROKER_LINECAP_SQUARE ) |
836 | { |
837 | /* add a square cap */ |
838 | FT_Vector delta, delta2; |
839 | FT_Angle rotate = FT_SIDE_TO_ROTATE( side )( ( ( 180L << 16 ) / 2 ) - (side) * ( 180L << 16 ) ); |
840 | FT_Fixed radius = stroker->radius; |
841 | FT_StrokeBorder border = stroker->borders + side; |
842 | |
843 | |
844 | FT_Vector_From_Polar( &delta2, radius, angle + rotate ); |
845 | FT_Vector_From_Polar( &delta, radius, angle ); |
846 | |
847 | delta.x += stroker->center.x + delta2.x; |
848 | delta.y += stroker->center.y + delta2.y; |
849 | |
850 | error = ft_stroke_border_lineto( border, &delta, FALSE0 ); |
851 | if ( error ) |
852 | goto Exit; |
853 | |
854 | FT_Vector_From_Polar( &delta2, radius, angle - rotate ); |
855 | FT_Vector_From_Polar( &delta, radius, angle ); |
856 | |
857 | delta.x += delta2.x + stroker->center.x; |
858 | delta.y += delta2.y + stroker->center.y; |
859 | |
860 | error = ft_stroke_border_lineto( border, &delta, FALSE0 ); |
861 | } |
862 | else if ( stroker->line_cap == FT_STROKER_LINECAP_BUTT ) |
863 | { |
864 | /* add a butt ending */ |
865 | FT_Vector delta; |
866 | FT_Angle rotate = FT_SIDE_TO_ROTATE( side )( ( ( 180L << 16 ) / 2 ) - (side) * ( 180L << 16 ) ); |
867 | FT_Fixed radius = stroker->radius; |
868 | FT_StrokeBorder border = stroker->borders + side; |
869 | |
870 | |
871 | FT_Vector_From_Polar( &delta, radius, angle + rotate ); |
872 | |
873 | delta.x += stroker->center.x; |
874 | delta.y += stroker->center.y; |
875 | |
876 | error = ft_stroke_border_lineto( border, &delta, FALSE0 ); |
877 | if ( error ) |
878 | goto Exit; |
879 | |
880 | FT_Vector_From_Polar( &delta, radius, angle - rotate ); |
881 | |
882 | delta.x += stroker->center.x; |
883 | delta.y += stroker->center.y; |
884 | |
885 | error = ft_stroke_border_lineto( border, &delta, FALSE0 ); |
886 | } |
887 | |
888 | Exit: |
889 | return error; |
890 | } |
891 | |
892 | |
893 | /* process an inside corner, i.e. compute intersection */ |
894 | static FT_Error |
895 | ft_stroker_inside( FT_Stroker stroker, |
896 | FT_Int side) |
897 | { |
898 | FT_StrokeBorder border = stroker->borders + side; |
899 | FT_Angle phi, theta, rotate; |
900 | FT_Fixed length, thcos, sigma; |
901 | FT_Vector delta; |
902 | FT_Error error = FT_Err_Ok; |
903 | |
904 | |
905 | rotate = FT_SIDE_TO_ROTATE( side )( ( ( 180L << 16 ) / 2 ) - (side) * ( 180L << 16 ) ); |
906 | |
907 | /* compute median angle */ |
908 | theta = FT_Angle_Diff( stroker->angle_in, stroker->angle_out ); |
909 | if ( theta == FT_ANGLE_PI( 180L << 16 ) ) |
910 | theta = rotate; |
911 | else |
912 | theta = theta / 2; |
913 | |
914 | phi = stroker->angle_in + theta; |
915 | |
916 | thcos = FT_Cos( theta ); |
917 | sigma = FT_MulFix( stroker->miter_limit, thcos )FT_MulFix_i386( stroker->miter_limit, thcos ); |
918 | |
919 | /* TODO: find better criterion to switch off the optimization */ |
920 | if ( sigma < 0x10000L ) |
921 | { |
922 | FT_Vector_From_Polar( &delta, stroker->radius, |
923 | stroker->angle_out + rotate ); |
924 | delta.x += stroker->center.x; |
925 | delta.y += stroker->center.y; |
926 | border->movable = FALSE0; |
927 | } |
928 | else |
929 | { |
930 | length = FT_DivFix( stroker->radius, thcos ); |
931 | |
932 | FT_Vector_From_Polar( &delta, length, phi + rotate ); |
933 | delta.x += stroker->center.x; |
934 | delta.y += stroker->center.y; |
935 | } |
936 | |
937 | error = ft_stroke_border_lineto( border, &delta, FALSE0 ); |
938 | |
939 | return error; |
940 | } |
941 | |
942 | |
943 | /* process an outside corner, i.e. compute bevel/miter/round */ |
944 | static FT_Error |
945 | ft_stroker_outside( FT_Stroker stroker, |
946 | FT_Int side ) |
947 | { |
948 | FT_StrokeBorder border = stroker->borders + side; |
949 | FT_Error error; |
950 | FT_Angle rotate; |
951 | |
952 | |
953 | if ( stroker->line_join == FT_STROKER_LINEJOIN_ROUND ) |
954 | error = ft_stroker_arcto( stroker, side ); |
955 | else |
956 | { |
957 | /* this is a mitered or beveled corner */ |
958 | FT_Fixed sigma, radius = stroker->radius; |
959 | FT_Angle theta, phi; |
960 | FT_Fixed thcos; |
961 | FT_Bool miter; |
962 | |
963 | |
964 | rotate = FT_SIDE_TO_ROTATE( side )( ( ( 180L << 16 ) / 2 ) - (side) * ( 180L << 16 ) ); |
965 | miter = FT_BOOL( stroker->line_join == FT_STROKER_LINEJOIN_MITER )( (FT_Bool)( stroker->line_join == FT_STROKER_LINEJOIN_MITER ) ); |
966 | |
967 | theta = FT_Angle_Diff( stroker->angle_in, stroker->angle_out ); |
968 | if ( theta == FT_ANGLE_PI( 180L << 16 ) ) |
969 | { |
970 | theta = rotate; |
971 | phi = stroker->angle_in; |
972 | } |
973 | else |
974 | { |
975 | theta = theta / 2; |
976 | phi = stroker->angle_in + theta + rotate; |
977 | } |
978 | |
979 | thcos = FT_Cos( theta ); |
980 | sigma = FT_MulFix( stroker->miter_limit, thcos )FT_MulFix_i386( stroker->miter_limit, thcos ); |
981 | |
982 | /* FT_Sin(x) = 0 for x <= 57 */ |
983 | if ( sigma >= 0x10000L || ft_pos_abs( theta ) <= 57 ) |
984 | miter = FALSE0; |
985 | |
986 | if ( miter ) /* this is a miter (broken angle) */ |
987 | { |
988 | FT_Vector middle, delta; |
989 | FT_Fixed length; |
990 | |
991 | |
992 | /* compute middle point */ |
993 | FT_Vector_From_Polar( &middle, |
994 | FT_MulFix( radius, stroker->miter_limit )FT_MulFix_i386( radius, stroker->miter_limit ), |
995 | phi ); |
996 | middle.x += stroker->center.x; |
997 | middle.y += stroker->center.y; |
998 | |
999 | /* compute first angle point */ |
1000 | length = FT_MulFix( radius,FT_MulFix_i386( radius, FT_DivFix( 0x10000L - sigma, ft_pos_abs ( FT_Sin( theta ) ) ) ) |
1001 | FT_DivFix( 0x10000L - sigma,FT_MulFix_i386( radius, FT_DivFix( 0x10000L - sigma, ft_pos_abs ( FT_Sin( theta ) ) ) ) |
1002 | ft_pos_abs( FT_Sin( theta ) ) ) )FT_MulFix_i386( radius, FT_DivFix( 0x10000L - sigma, ft_pos_abs ( FT_Sin( theta ) ) ) ); |
1003 | |
1004 | FT_Vector_From_Polar( &delta, length, phi + rotate ); |
1005 | delta.x += middle.x; |
1006 | delta.y += middle.y; |
1007 | |
1008 | error = ft_stroke_border_lineto( border, &delta, FALSE0 ); |
1009 | if ( error ) |
1010 | goto Exit; |
1011 | |
1012 | /* compute second angle point */ |
1013 | FT_Vector_From_Polar( &delta, length, phi - rotate ); |
1014 | delta.x += middle.x; |
1015 | delta.y += middle.y; |
1016 | |
1017 | error = ft_stroke_border_lineto( border, &delta, FALSE0 ); |
1018 | if ( error ) |
1019 | goto Exit; |
1020 | |
1021 | /* finally, add a movable end point */ |
1022 | FT_Vector_From_Polar( &delta, radius, stroker->angle_out + rotate ); |
1023 | delta.x += stroker->center.x; |
1024 | delta.y += stroker->center.y; |
1025 | |
1026 | error = ft_stroke_border_lineto( border, &delta, TRUE1 ); |
1027 | } |
1028 | |
1029 | else /* this is a bevel (intersection) */ |
1030 | { |
1031 | FT_Fixed length; |
1032 | FT_Vector delta; |
1033 | |
1034 | |
1035 | length = FT_DivFix( stroker->radius, thcos ); |
1036 | |
1037 | FT_Vector_From_Polar( &delta, length, phi ); |
1038 | delta.x += stroker->center.x; |
1039 | delta.y += stroker->center.y; |
1040 | |
1041 | error = ft_stroke_border_lineto( border, &delta, FALSE0 ); |
1042 | if ( error ) |
1043 | goto Exit; |
1044 | |
1045 | /* now add end point */ |
1046 | FT_Vector_From_Polar( &delta, stroker->radius, |
1047 | stroker->angle_out + rotate ); |
1048 | delta.x += stroker->center.x; |
1049 | delta.y += stroker->center.y; |
1050 | |
1051 | error = ft_stroke_border_lineto( border, &delta, TRUE1 ); |
1052 | } |
1053 | } |
1054 | |
1055 | Exit: |
1056 | return error; |
1057 | } |
1058 | |
1059 | |
1060 | static FT_Error |
1061 | ft_stroker_process_corner( FT_Stroker stroker ) |
1062 | { |
1063 | FT_Error error = FT_Err_Ok; |
1064 | FT_Angle turn; |
1065 | FT_Int inside_side; |
1066 | |
1067 | |
1068 | turn = FT_Angle_Diff( stroker->angle_in, stroker->angle_out ); |
1069 | |
1070 | /* no specific corner processing is required if the turn is 0 */ |
1071 | if ( turn == 0 ) |
1072 | goto Exit; |
1073 | |
1074 | /* when we turn to the right, the inside side is 0 */ |
1075 | inside_side = 0; |
1076 | |
1077 | /* otherwise, the inside side is 1 */ |
1078 | if ( turn < 0 ) |
1079 | inside_side = 1; |
1080 | |
1081 | /* process the inside side */ |
1082 | error = ft_stroker_inside( stroker, inside_side ); |
1083 | if ( error ) |
1084 | goto Exit; |
1085 | |
1086 | /* process the outside side */ |
1087 | error = ft_stroker_outside( stroker, 1 - inside_side ); |
1088 | |
1089 | Exit: |
1090 | return error; |
1091 | } |
1092 | |
1093 | |
1094 | /* add two points to the left and right borders corresponding to the */ |
1095 | /* start of the subpath */ |
1096 | static FT_Error |
1097 | ft_stroker_subpath_start( FT_Stroker stroker, |
1098 | FT_Angle start_angle ) |
1099 | { |
1100 | FT_Vector delta; |
1101 | FT_Vector point; |
1102 | FT_Error error; |
1103 | FT_StrokeBorder border; |
1104 | |
1105 | |
1106 | FT_Vector_From_Polar( &delta, stroker->radius, |
1107 | start_angle + FT_ANGLE_PI2( ( 180L << 16 ) / 2 ) ); |
1108 | |
1109 | point.x = stroker->center.x + delta.x; |
1110 | point.y = stroker->center.y + delta.y; |
1111 | |
1112 | border = stroker->borders; |
1113 | error = ft_stroke_border_moveto( border, &point ); |
1114 | if ( error ) |
1115 | goto Exit; |
1116 | |
1117 | point.x = stroker->center.x - delta.x; |
1118 | point.y = stroker->center.y - delta.y; |
1119 | |
1120 | border++; |
1121 | error = ft_stroke_border_moveto( border, &point ); |
1122 | |
1123 | /* save angle for last cap */ |
1124 | stroker->subpath_angle = start_angle; |
1125 | stroker->first_point = FALSE0; |
1126 | |
1127 | Exit: |
1128 | return error; |
1129 | } |
1130 | |
1131 | |
1132 | /* documentation is in ftstroke.h */ |
1133 | |
1134 | FT_EXPORT_DEF( FT_Error )extern FT_Error |
1135 | FT_Stroker_LineTo( FT_Stroker stroker, |
1136 | FT_Vector* to ) |
1137 | { |
1138 | FT_Error error = FT_Err_Ok; |
1139 | FT_StrokeBorder border; |
1140 | FT_Vector delta; |
1141 | FT_Angle angle; |
1142 | FT_Int side; |
1143 | |
1144 | delta.x = to->x - stroker->center.x; |
1145 | delta.y = to->y - stroker->center.y; |
1146 | |
1147 | angle = FT_Atan2( delta.x, delta.y ); |
1148 | FT_Vector_From_Polar( &delta, stroker->radius, angle + FT_ANGLE_PI2( ( 180L << 16 ) / 2 ) ); |
1149 | |
1150 | /* process corner if necessary */ |
1151 | if ( stroker->first_point ) |
1152 | { |
1153 | /* This is the first segment of a subpath. We need to */ |
1154 | /* add a point to each border at their respective starting */ |
1155 | /* point locations. */ |
1156 | error = ft_stroker_subpath_start( stroker, angle ); |
1157 | if ( error ) |
1158 | goto Exit; |
1159 | } |
1160 | else |
1161 | { |
1162 | /* process the current corner */ |
1163 | stroker->angle_out = angle; |
1164 | error = ft_stroker_process_corner( stroker ); |
1165 | if ( error ) |
1166 | goto Exit; |
1167 | } |
1168 | |
1169 | /* now add a line segment to both the `inside' and `outside' paths */ |
1170 | |
1171 | for ( border = stroker->borders, side = 1; side >= 0; side--, border++ ) |
1172 | { |
1173 | FT_Vector point; |
1174 | |
1175 | |
1176 | point.x = to->x + delta.x; |
1177 | point.y = to->y + delta.y; |
1178 | |
1179 | error = ft_stroke_border_lineto( border, &point, TRUE1 ); |
1180 | if ( error ) |
1181 | goto Exit; |
1182 | |
1183 | delta.x = -delta.x; |
1184 | delta.y = -delta.y; |
1185 | } |
1186 | |
1187 | stroker->angle_in = angle; |
1188 | stroker->center = *to; |
1189 | |
1190 | Exit: |
1191 | return error; |
1192 | } |
1193 | |
1194 | |
1195 | /* documentation is in ftstroke.h */ |
1196 | |
1197 | FT_EXPORT_DEF( FT_Error )extern FT_Error |
1198 | FT_Stroker_ConicTo( FT_Stroker stroker, |
1199 | FT_Vector* control, |
1200 | FT_Vector* to ) |
1201 | { |
1202 | FT_Error error = FT_Err_Ok; |
1203 | FT_Vector bez_stack[34]; |
1204 | FT_Vector* arc; |
1205 | FT_Vector* limit = bez_stack + 30; |
1206 | FT_Angle start_angle; |
1207 | FT_Bool first_arc = TRUE1; |
1208 | |
1209 | |
1210 | arc = bez_stack; |
1211 | arc[0] = *to; |
1212 | arc[1] = *control; |
1213 | arc[2] = stroker->center; |
1214 | |
1215 | while ( arc >= bez_stack ) |
1216 | { |
1217 | FT_Angle angle_in, angle_out; |
1218 | |
1219 | |
1220 | angle_in = angle_out = 0; /* remove compiler warnings */ |
1221 | |
1222 | if ( arc < limit && |
1223 | !ft_conic_is_small_enough( arc, &angle_in, &angle_out ) ) |
1224 | { |
1225 | ft_conic_split( arc ); |
1226 | arc += 2; |
1227 | continue; |
1228 | } |
1229 | |
1230 | if ( first_arc ) |
1231 | { |
1232 | first_arc = FALSE0; |
1233 | |
1234 | start_angle = angle_in; |
1235 | |
1236 | /* process corner if necessary */ |
1237 | if ( stroker->first_point ) |
1238 | error = ft_stroker_subpath_start( stroker, start_angle ); |
1239 | else |
1240 | { |
1241 | stroker->angle_out = start_angle; |
1242 | error = ft_stroker_process_corner( stroker ); |
1243 | } |
1244 | } |
1245 | |
1246 | /* the arc's angle is small enough; we can add it directly to each */ |
1247 | /* border */ |
1248 | { |
1249 | FT_Vector ctrl, end; |
1250 | FT_Angle theta, phi, rotate; |
1251 | FT_Fixed length; |
1252 | FT_Int side; |
1253 | |
1254 | |
1255 | theta = FT_Angle_Diff( angle_in, angle_out ) / 2; |
1256 | phi = angle_in + theta; |
1257 | length = FT_DivFix( stroker->radius, FT_Cos( theta ) ); |
1258 | |
1259 | for ( side = 0; side <= 1; side++ ) |
1260 | { |
1261 | rotate = FT_SIDE_TO_ROTATE( side )( ( ( 180L << 16 ) / 2 ) - (side) * ( 180L << 16 ) ); |
1262 | |
1263 | /* compute control point */ |
1264 | FT_Vector_From_Polar( &ctrl, length, phi + rotate ); |
1265 | ctrl.x += arc[1].x; |
1266 | ctrl.y += arc[1].y; |
1267 | |
1268 | /* compute end point */ |
1269 | FT_Vector_From_Polar( &end, stroker->radius, angle_out + rotate ); |
1270 | end.x += arc[0].x; |
1271 | end.y += arc[0].y; |
1272 | |
1273 | error = ft_stroke_border_conicto( stroker->borders + side, |
1274 | &ctrl, &end ); |
1275 | if ( error ) |
1276 | goto Exit; |
1277 | } |
1278 | } |
1279 | |
1280 | arc -= 2; |
1281 | |
1282 | if ( arc < bez_stack ) |
1283 | stroker->angle_in = angle_out; |
1284 | } |
1285 | |
1286 | stroker->center = *to; |
1287 | |
1288 | Exit: |
1289 | return error; |
1290 | } |
1291 | |
1292 | |
1293 | /* documentation is in ftstroke.h */ |
1294 | |
1295 | FT_EXPORT_DEF( FT_Error )extern FT_Error |
1296 | FT_Stroker_CubicTo( FT_Stroker stroker, |
1297 | FT_Vector* control1, |
1298 | FT_Vector* control2, |
1299 | FT_Vector* to ) |
1300 | { |
1301 | FT_Error error = FT_Err_Ok; |
1302 | FT_Vector bez_stack[37]; |
1303 | FT_Vector* arc; |
1304 | FT_Vector* limit = bez_stack + 32; |
1305 | FT_Angle start_angle; |
1306 | FT_Bool first_arc = TRUE1; |
1307 | |
1308 | |
1309 | arc = bez_stack; |
1310 | arc[0] = *to; |
1311 | arc[1] = *control2; |
1312 | arc[2] = *control1; |
1313 | arc[3] = stroker->center; |
1314 | |
1315 | while ( arc >= bez_stack ) |
1316 | { |
1317 | FT_Angle angle_in, angle_mid, angle_out; |
1318 | |
1319 | |
1320 | /* remove compiler warnings */ |
1321 | angle_in = angle_out = angle_mid = 0; |
1322 | |
1323 | if ( arc < limit && |
1324 | !ft_cubic_is_small_enough( arc, &angle_in, |
1325 | &angle_mid, &angle_out ) ) |
1326 | { |
1327 | ft_cubic_split( arc ); |
1328 | arc += 3; |
1329 | continue; |
1330 | } |
1331 | |
1332 | if ( first_arc ) |
1333 | { |
1334 | first_arc = FALSE0; |
1335 | |
1336 | /* process corner if necessary */ |
1337 | start_angle = angle_in; |
1338 | |
1339 | if ( stroker->first_point ) |
1340 | error = ft_stroker_subpath_start( stroker, start_angle ); |
1341 | else |
1342 | { |
1343 | stroker->angle_out = start_angle; |
1344 | error = ft_stroker_process_corner( stroker ); |
1345 | } |
1346 | if ( error ) |
1347 | goto Exit; |
1348 | } |
1349 | |
1350 | /* the arc's angle is small enough; we can add it directly to each */ |
1351 | /* border */ |
1352 | { |
1353 | FT_Vector ctrl1, ctrl2, end; |
1354 | FT_Angle theta1, phi1, theta2, phi2, rotate; |
1355 | FT_Fixed length1, length2; |
1356 | FT_Int side; |
1357 | |
1358 | |
1359 | theta1 = ft_pos_abs( angle_mid - angle_in ) / 2; |
1360 | theta2 = ft_pos_abs( angle_out - angle_mid ) / 2; |
1361 | phi1 = (angle_mid + angle_in ) / 2; |
1362 | phi2 = (angle_mid + angle_out ) / 2; |
1363 | length1 = FT_DivFix( stroker->radius, FT_Cos( theta1 ) ); |
1364 | length2 = FT_DivFix( stroker->radius, FT_Cos( theta2 ) ); |
1365 | |
1366 | for ( side = 0; side <= 1; side++ ) |
1367 | { |
1368 | rotate = FT_SIDE_TO_ROTATE( side )( ( ( 180L << 16 ) / 2 ) - (side) * ( 180L << 16 ) ); |
1369 | |
1370 | /* compute control points */ |
1371 | FT_Vector_From_Polar( &ctrl1, length1, phi1 + rotate ); |
1372 | ctrl1.x += arc[2].x; |
1373 | ctrl1.y += arc[2].y; |
1374 | |
1375 | FT_Vector_From_Polar( &ctrl2, length2, phi2 + rotate ); |
1376 | ctrl2.x += arc[1].x; |
1377 | ctrl2.y += arc[1].y; |
1378 | |
1379 | /* compute end point */ |
1380 | FT_Vector_From_Polar( &end, stroker->radius, angle_out + rotate ); |
1381 | end.x += arc[0].x; |
1382 | end.y += arc[0].y; |
1383 | |
1384 | error = ft_stroke_border_cubicto( stroker->borders + side, |
1385 | &ctrl1, &ctrl2, &end ); |
1386 | if ( error ) |
1387 | goto Exit; |
1388 | } |
1389 | } |
1390 | |
1391 | arc -= 3; |
1392 | if ( arc < bez_stack ) |
1393 | stroker->angle_in = angle_out; |
1394 | } |
1395 | |
1396 | stroker->center = *to; |
1397 | |
1398 | Exit: |
1399 | return error; |
1400 | } |
1401 | |
1402 | |
1403 | /* documentation is in ftstroke.h */ |
1404 | |
1405 | FT_EXPORT_DEF( FT_Error )extern FT_Error |
1406 | FT_Stroker_BeginSubPath( FT_Stroker stroker, |
1407 | FT_Vector* to, |
1408 | FT_Bool open ) |
1409 | { |
1410 | /* We cannot process the first point, because there is not enough */ |
1411 | /* information regarding its corner/cap. The latter will be processed */ |
1412 | /* in the `FT_Stroker_EndSubPath' routine. */ |
1413 | /* */ |
1414 | stroker->first_point = TRUE1; |
1415 | stroker->center = *to; |
1416 | stroker->subpath_open = open; |
1417 | |
1418 | /* record the subpath start point for each border */ |
1419 | stroker->subpath_start = *to; |
1420 | |
1421 | return FT_Err_Ok; |
1422 | } |
1423 | |
1424 | |
1425 | static FT_Error |
1426 | ft_stroker_add_reverse_left( FT_Stroker stroker, |
1427 | FT_Bool open ) |
1428 | { |
1429 | FT_StrokeBorder right = stroker->borders + 0; |
1430 | FT_StrokeBorder left = stroker->borders + 1; |
1431 | FT_Int new_points; |
1432 | FT_Error error = FT_Err_Ok; |
1433 | |
1434 | |
1435 | FT_ASSERT( left->start >= 0 )do { } while ( 0 ); |
1436 | |
1437 | new_points = left->num_points - left->start; |
1438 | if ( new_points > 0 ) |
1439 | { |
1440 | error = ft_stroke_border_grow( right, (FT_UInt)new_points ); |
1441 | if ( error ) |
1442 | goto Exit; |
1443 | |
1444 | { |
1445 | FT_Vector* dst_point = right->points + right->num_points; |
1446 | FT_Byte* dst_tag = right->tags + right->num_points; |
1447 | FT_Vector* src_point = left->points + left->num_points - 1; |
1448 | FT_Byte* src_tag = left->tags + left->num_points - 1; |
1449 | |
1450 | while ( src_point >= left->points + left->start ) |
1451 | { |
1452 | *dst_point = *src_point; |
1453 | *dst_tag = *src_tag; |
1454 | |
1455 | if ( open ) |
1456 | dst_tag[0] &= ~FT_STROKE_TAG_BEGIN_END(FT_STROKE_TAG_BEGIN|FT_STROKE_TAG_END); |
1457 | else |
1458 | { |
1459 | FT_Byte ttag = (FT_Byte)( dst_tag[0] & FT_STROKE_TAG_BEGIN_END(FT_STROKE_TAG_BEGIN|FT_STROKE_TAG_END) ); |
1460 | |
1461 | |
1462 | /* switch begin/end tags if necessary */ |
1463 | if ( ttag == FT_STROKE_TAG_BEGIN || |
1464 | ttag == FT_STROKE_TAG_END ) |
1465 | dst_tag[0] ^= FT_STROKE_TAG_BEGIN_END(FT_STROKE_TAG_BEGIN|FT_STROKE_TAG_END); |
1466 | |
1467 | } |
1468 | |
1469 | src_point--; |
1470 | src_tag--; |
1471 | dst_point++; |
1472 | dst_tag++; |
1473 | } |
1474 | } |
1475 | |
1476 | left->num_points = left->start; |
1477 | right->num_points += new_points; |
1478 | |
1479 | right->movable = FALSE0; |
1480 | left->movable = FALSE0; |
1481 | } |
1482 | |
1483 | Exit: |
1484 | return error; |
1485 | } |
1486 | |
1487 | |
1488 | /* documentation is in ftstroke.h */ |
1489 | |
1490 | /* there's a lot of magic in this function! */ |
1491 | FT_EXPORT_DEF( FT_Error )extern FT_Error |
1492 | FT_Stroker_EndSubPath( FT_Stroker stroker ) |
1493 | { |
1494 | FT_Error error = FT_Err_Ok; |
1495 | |
1496 | |
1497 | if ( stroker->subpath_open ) |
1498 | { |
1499 | FT_StrokeBorder right = stroker->borders; |
1500 | |
1501 | /* All right, this is an opened path, we need to add a cap between */ |
1502 | /* right & left, add the reverse of left, then add a final cap */ |
1503 | /* between left & right. */ |
1504 | error = ft_stroker_cap( stroker, stroker->angle_in, 0 ); |
1505 | if ( error ) |
1506 | goto Exit; |
1507 | |
1508 | /* add reversed points from `left' to `right' */ |
1509 | error = ft_stroker_add_reverse_left( stroker, TRUE1 ); |
1510 | if ( error ) |
1511 | goto Exit; |
1512 | |
1513 | /* now add the final cap */ |
1514 | stroker->center = stroker->subpath_start; |
1515 | error = ft_stroker_cap( stroker, |
1516 | stroker->subpath_angle + FT_ANGLE_PI( 180L << 16 ), 0 ); |
1517 | if ( error ) |
1518 | goto Exit; |
1519 | |
1520 | /* Now end the right subpath accordingly. The left one is */ |
1521 | /* rewind and doesn't need further processing. */ |
1522 | ft_stroke_border_close( right, FALSE0 ); |
1523 | } |
1524 | else |
1525 | { |
1526 | FT_Angle turn; |
1527 | FT_Int inside_side; |
1528 | |
1529 | /* close the path if needed */ |
1530 | if ( stroker->center.x != stroker->subpath_start.x || |
1531 | stroker->center.y != stroker->subpath_start.y ) |
1532 | { |
1533 | error = FT_Stroker_LineTo( stroker, &stroker->subpath_start ); |
1534 | if ( error ) |
1535 | goto Exit; |
1536 | } |
1537 | |
1538 | /* process the corner */ |
1539 | stroker->angle_out = stroker->subpath_angle; |
1540 | turn = FT_Angle_Diff( stroker->angle_in, |
1541 | stroker->angle_out ); |
1542 | |
1543 | /* no specific corner processing is required if the turn is 0 */ |
1544 | if ( turn != 0 ) |
1545 | { |
1546 | /* when we turn to the right, the inside side is 0 */ |
1547 | inside_side = 0; |
1548 | |
1549 | /* otherwise, the inside side is 1 */ |
1550 | if ( turn < 0 ) |
1551 | inside_side = 1; |
1552 | |
1553 | error = ft_stroker_inside( stroker, inside_side ); |
1554 | if ( error ) |
1555 | goto Exit; |
1556 | |
1557 | /* process the outside side */ |
1558 | error = ft_stroker_outside( stroker, 1 - inside_side ); |
1559 | if ( error ) |
1560 | goto Exit; |
1561 | } |
1562 | |
1563 | /* then end our two subpaths */ |
1564 | ft_stroke_border_close( stroker->borders + 0, TRUE1 ); |
1565 | ft_stroke_border_close( stroker->borders + 1, FALSE0 ); |
1566 | } |
1567 | |
1568 | Exit: |
1569 | return error; |
1570 | } |
1571 | |
1572 | |
1573 | /* documentation is in ftstroke.h */ |
1574 | |
1575 | FT_EXPORT_DEF( FT_Error )extern FT_Error |
1576 | FT_Stroker_GetBorderCounts( FT_Stroker stroker, |
1577 | FT_StrokerBorder border, |
1578 | FT_UInt *anum_points, |
1579 | FT_UInt *anum_contours ) |
1580 | { |
1581 | FT_UInt num_points = 0, num_contours = 0; |
1582 | FT_Error error; |
1583 | |
1584 | |
1585 | if ( !stroker || border > 1 ) |
1586 | { |
1587 | error = FT_Err_Invalid_Argument; |
1588 | goto Exit; |
1589 | } |
1590 | |
1591 | error = ft_stroke_border_get_counts( stroker->borders + border, |
1592 | &num_points, &num_contours ); |
1593 | Exit: |
1594 | if ( anum_points ) |
1595 | *anum_points = num_points; |
1596 | |
1597 | if ( anum_contours ) |
1598 | *anum_contours = num_contours; |
1599 | |
1600 | return error; |
1601 | } |
1602 | |
1603 | |
1604 | /* documentation is in ftstroke.h */ |
1605 | |
1606 | FT_EXPORT_DEF( FT_Error )extern FT_Error |
1607 | FT_Stroker_GetCounts( FT_Stroker stroker, |
1608 | FT_UInt *anum_points, |
1609 | FT_UInt *anum_contours ) |
1610 | { |
1611 | FT_UInt count1, count2, num_points = 0; |
1612 | FT_UInt count3, count4, num_contours = 0; |
1613 | FT_Error error; |
1614 | |
1615 | |
1616 | error = ft_stroke_border_get_counts( stroker->borders + 0, |
1617 | &count1, &count2 ); |
1618 | if ( error ) |
1619 | goto Exit; |
1620 | |
1621 | error = ft_stroke_border_get_counts( stroker->borders + 1, |
1622 | &count3, &count4 ); |
1623 | if ( error ) |
1624 | goto Exit; |
1625 | |
1626 | num_points = count1 + count3; |
1627 | num_contours = count2 + count4; |
1628 | |
1629 | Exit: |
1630 | *anum_points = num_points; |
1631 | *anum_contours = num_contours; |
1632 | return error; |
1633 | } |
1634 | |
1635 | |
1636 | /* documentation is in ftstroke.h */ |
1637 | |
1638 | FT_EXPORT_DEF( void )extern void |
1639 | FT_Stroker_ExportBorder( FT_Stroker stroker, |
1640 | FT_StrokerBorder border, |
1641 | FT_Outline* outline ) |
1642 | { |
1643 | if ( border == FT_STROKER_BORDER_LEFT || |
1644 | border == FT_STROKER_BORDER_RIGHT ) |
1645 | { |
1646 | FT_StrokeBorder sborder = & stroker->borders[border]; |
1647 | |
1648 | |
1649 | if ( sborder->valid ) |
1650 | ft_stroke_border_export( sborder, outline ); |
1651 | } |
1652 | } |
1653 | |
1654 | |
1655 | /* documentation is in ftstroke.h */ |
1656 | |
1657 | FT_EXPORT_DEF( void )extern void |
1658 | FT_Stroker_Export( FT_Stroker stroker, |
1659 | FT_Outline* outline ) |
1660 | { |
1661 | FT_Stroker_ExportBorder( stroker, FT_STROKER_BORDER_LEFT, outline ); |
1662 | FT_Stroker_ExportBorder( stroker, FT_STROKER_BORDER_RIGHT, outline ); |
1663 | } |
1664 | |
1665 | |
1666 | /* documentation is in ftstroke.h */ |
1667 | |
1668 | /* |
1669 | * The following is very similar to FT_Outline_Decompose, except |
1670 | * that we do support opened paths, and do not scale the outline. |
1671 | */ |
1672 | FT_EXPORT_DEF( FT_Error )extern FT_Error |
1673 | FT_Stroker_ParseOutline( FT_Stroker stroker, |
1674 | FT_Outline* outline, |
1675 | FT_Bool opened ) |
1676 | { |
1677 | FT_Vector v_last; |
1678 | FT_Vector v_control; |
1679 | FT_Vector v_start; |
1680 | |
1681 | FT_Vector* point; |
1682 | FT_Vector* limit; |
1683 | char* tags; |
1684 | |
1685 | FT_Error error; |
1686 | |
1687 | FT_Int n; /* index of contour in outline */ |
1688 | FT_UInt first; /* index of first point in contour */ |
1689 | FT_Int tag; /* current point's state */ |
1690 | |
1691 | |
1692 | if ( !outline || !stroker ) |
1693 | return FT_Err_Invalid_Argument; |
1694 | |
1695 | FT_Stroker_Rewind( stroker ); |
1696 | |
1697 | first = 0; |
1698 | |
1699 | for ( n = 0; n < outline->n_contours; n++ ) |
1700 | { |
1701 | FT_UInt last; /* index of last point in contour */ |
1702 | |
1703 | |
1704 | last = outline->contours[n]; |
1705 | limit = outline->points + last; |
1706 | |
1707 | /* skip empty points; we don't stroke these */ |
1708 | if ( last <= first ) |
1709 | { |
1710 | first = last + 1; |
1711 | continue; |
1712 | } |
1713 | |
1714 | v_start = outline->points[first]; |
1715 | v_last = outline->points[last]; |
1716 | |
1717 | v_control = v_start; |
1718 | |
1719 | point = outline->points + first; |
1720 | tags = outline->tags + first; |
1721 | tag = FT_CURVE_TAG( tags[0] )( tags[0] & 3 ); |
1722 | |
1723 | /* A contour cannot start with a cubic control point! */ |
1724 | if ( tag == FT_CURVE_TAG_CUBIC2 ) |
1725 | goto Invalid_Outline; |
1726 | |
1727 | /* check first point to determine origin */ |
1728 | if ( tag == FT_CURVE_TAG_CONIC0 ) |
1729 | { |
1730 | /* First point is conic control. Yes, this happens. */ |
1731 | if ( FT_CURVE_TAG( outline->tags[last] )( outline->tags[last] & 3 ) == FT_CURVE_TAG_ON1 ) |
1732 | { |
1733 | /* start at last point if it is on the curve */ |
1734 | v_start = v_last; |
1735 | limit--; |
1736 | } |
1737 | else |
1738 | { |
1739 | /* if both first and last points are conic, */ |
1740 | /* start at their middle and record its position */ |
1741 | /* for closure */ |
1742 | v_start.x = ( v_start.x + v_last.x ) / 2; |
1743 | v_start.y = ( v_start.y + v_last.y ) / 2; |
1744 | |
1745 | v_last = v_start; |
Value stored to 'v_last' is never read | |
1746 | } |
1747 | point--; |
1748 | tags--; |
1749 | } |
1750 | |
1751 | error = FT_Stroker_BeginSubPath( stroker, &v_start, opened ); |
1752 | if ( error ) |
1753 | goto Exit; |
1754 | |
1755 | while ( point < limit ) |
1756 | { |
1757 | point++; |
1758 | tags++; |
1759 | |
1760 | tag = FT_CURVE_TAG( tags[0] )( tags[0] & 3 ); |
1761 | switch ( tag ) |
1762 | { |
1763 | case FT_CURVE_TAG_ON1: /* emit a single line_to */ |
1764 | { |
1765 | FT_Vector vec; |
1766 | |
1767 | |
1768 | vec.x = point->x; |
1769 | vec.y = point->y; |
1770 | |
1771 | error = FT_Stroker_LineTo( stroker, &vec ); |
1772 | if ( error ) |
1773 | goto Exit; |
1774 | continue; |
1775 | } |
1776 | |
1777 | case FT_CURVE_TAG_CONIC0: /* consume conic arcs */ |
1778 | v_control.x = point->x; |
1779 | v_control.y = point->y; |
1780 | |
1781 | Do_Conic: |
1782 | if ( point < limit ) |
1783 | { |
1784 | FT_Vector vec; |
1785 | FT_Vector v_middle; |
1786 | |
1787 | |
1788 | point++; |
1789 | tags++; |
1790 | tag = FT_CURVE_TAG( tags[0] )( tags[0] & 3 ); |
1791 | |
1792 | vec = point[0]; |
1793 | |
1794 | if ( tag == FT_CURVE_TAG_ON1 ) |
1795 | { |
1796 | error = FT_Stroker_ConicTo( stroker, &v_control, &vec ); |
1797 | if ( error ) |
1798 | goto Exit; |
1799 | continue; |
1800 | } |
1801 | |
1802 | if ( tag != FT_CURVE_TAG_CONIC0 ) |
1803 | goto Invalid_Outline; |
1804 | |
1805 | v_middle.x = ( v_control.x + vec.x ) / 2; |
1806 | v_middle.y = ( v_control.y + vec.y ) / 2; |
1807 | |
1808 | error = FT_Stroker_ConicTo( stroker, &v_control, &v_middle ); |
1809 | if ( error ) |
1810 | goto Exit; |
1811 | |
1812 | v_control = vec; |
1813 | goto Do_Conic; |
1814 | } |
1815 | |
1816 | error = FT_Stroker_ConicTo( stroker, &v_control, &v_start ); |
1817 | goto Close; |
1818 | |
1819 | default: /* FT_CURVE_TAG_CUBIC */ |
1820 | { |
1821 | FT_Vector vec1, vec2; |
1822 | |
1823 | |
1824 | if ( point + 1 > limit || |
1825 | FT_CURVE_TAG( tags[1] )( tags[1] & 3 ) != FT_CURVE_TAG_CUBIC2 ) |
1826 | goto Invalid_Outline; |
1827 | |
1828 | point += 2; |
1829 | tags += 2; |
1830 | |
1831 | vec1 = point[-2]; |
1832 | vec2 = point[-1]; |
1833 | |
1834 | if ( point <= limit ) |
1835 | { |
1836 | FT_Vector vec; |
1837 | |
1838 | |
1839 | vec = point[0]; |
1840 | |
1841 | error = FT_Stroker_CubicTo( stroker, &vec1, &vec2, &vec ); |
1842 | if ( error ) |
1843 | goto Exit; |
1844 | continue; |
1845 | } |
1846 | |
1847 | error = FT_Stroker_CubicTo( stroker, &vec1, &vec2, &v_start ); |
1848 | goto Close; |
1849 | } |
1850 | } |
1851 | } |
1852 | |
1853 | Close: |
1854 | if ( error ) |
1855 | goto Exit; |
1856 | |
1857 | error = FT_Stroker_EndSubPath( stroker ); |
1858 | if ( error ) |
1859 | goto Exit; |
1860 | |
1861 | first = last + 1; |
1862 | } |
1863 | |
1864 | return FT_Err_Ok; |
1865 | |
1866 | Exit: |
1867 | return error; |
1868 | |
1869 | Invalid_Outline: |
1870 | return FT_Err_Invalid_Outline; |
1871 | } |
1872 | |
1873 | /* declare an extern to access ft_outline_glyph_class global allocated |
1874 | in ftglyph.c, and use the FT_OUTLINE_GLYPH_CLASS_GET macro to access |
1875 | it when FT_CONFIG_OPTION_PIC is defined */ |
1876 | #ifndef FT_CONFIG_OPTION_PIC |
1877 | extern const FT_Glyph_Class ft_outline_glyph_class; |
1878 | #endif |
1879 | #include "basepic.h" |
1880 | |
1881 | |
1882 | /* documentation is in ftstroke.h */ |
1883 | |
1884 | FT_EXPORT_DEF( FT_Error )extern FT_Error |
1885 | FT_Glyph_Stroke( FT_Glyph *pglyph, |
1886 | FT_Stroker stroker, |
1887 | FT_Bool destroy ) |
1888 | { |
1889 | FT_Error error = FT_Err_Invalid_Argument; |
1890 | FT_Glyph glyph = NULL((void*)0); |
1891 | FT_Library library = stroker->library; |
1892 | FT_UNUSED(library)( (library) = (library) ); |
1893 | |
1894 | if ( pglyph == NULL((void*)0) ) |
1895 | goto Exit; |
1896 | |
1897 | glyph = *pglyph; |
1898 | if ( glyph == NULL((void*)0) || glyph->clazz != FT_OUTLINE_GLYPH_CLASS_GET&ft_outline_glyph_class ) |
1899 | goto Exit; |
1900 | |
1901 | { |
1902 | FT_Glyph copy; |
1903 | |
1904 | |
1905 | error = FT_Glyph_Copy( glyph, © ); |
1906 | if ( error ) |
1907 | goto Exit; |
1908 | |
1909 | glyph = copy; |
1910 | } |
1911 | |
1912 | { |
1913 | FT_OutlineGlyph oglyph = (FT_OutlineGlyph) glyph; |
1914 | FT_Outline* outline = &oglyph->outline; |
1915 | FT_UInt num_points, num_contours; |
1916 | |
1917 | |
1918 | error = FT_Stroker_ParseOutline( stroker, outline, FALSE0 ); |
1919 | if ( error ) |
1920 | goto Fail; |
1921 | |
1922 | (void)FT_Stroker_GetCounts( stroker, &num_points, &num_contours ); |
1923 | |
1924 | FT_Outline_Done( glyph->library, outline ); |
1925 | |
1926 | error = FT_Outline_New( glyph->library, |
1927 | num_points, num_contours, outline ); |
1928 | if ( error ) |
1929 | goto Fail; |
1930 | |
1931 | outline->n_points = 0; |
1932 | outline->n_contours = 0; |
1933 | |
1934 | FT_Stroker_Export( stroker, outline ); |
1935 | } |
1936 | |
1937 | if ( destroy ) |
1938 | FT_Done_Glyph( *pglyph ); |
1939 | |
1940 | *pglyph = glyph; |
1941 | goto Exit; |
1942 | |
1943 | Fail: |
1944 | FT_Done_Glyph( glyph ); |
1945 | glyph = NULL((void*)0); |
1946 | |
1947 | if ( !destroy ) |
1948 | *pglyph = NULL((void*)0); |
1949 | |
1950 | Exit: |
1951 | return error; |
1952 | } |
1953 | |
1954 | |
1955 | /* documentation is in ftstroke.h */ |
1956 | |
1957 | FT_EXPORT_DEF( FT_Error )extern FT_Error |
1958 | FT_Glyph_StrokeBorder( FT_Glyph *pglyph, |
1959 | FT_Stroker stroker, |
1960 | FT_Bool inside, |
1961 | FT_Bool destroy ) |
1962 | { |
1963 | FT_Error error = FT_Err_Invalid_Argument; |
1964 | FT_Glyph glyph = NULL((void*)0); |
1965 | FT_Library library = stroker->library; |
1966 | FT_UNUSED(library)( (library) = (library) ); |
1967 | |
1968 | if ( pglyph == NULL((void*)0) ) |
1969 | goto Exit; |
1970 | |
1971 | glyph = *pglyph; |
1972 | if ( glyph == NULL((void*)0) || glyph->clazz != FT_OUTLINE_GLYPH_CLASS_GET&ft_outline_glyph_class ) |
1973 | goto Exit; |
1974 | |
1975 | { |
1976 | FT_Glyph copy; |
1977 | |
1978 | |
1979 | error = FT_Glyph_Copy( glyph, © ); |
1980 | if ( error ) |
1981 | goto Exit; |
1982 | |
1983 | glyph = copy; |
1984 | } |
1985 | |
1986 | { |
1987 | FT_OutlineGlyph oglyph = (FT_OutlineGlyph) glyph; |
1988 | FT_StrokerBorder border; |
1989 | FT_Outline* outline = &oglyph->outline; |
1990 | FT_UInt num_points, num_contours; |
1991 | |
1992 | |
1993 | border = FT_Outline_GetOutsideBorder( outline ); |
1994 | if ( inside ) |
1995 | { |
1996 | if ( border == FT_STROKER_BORDER_LEFT ) |
1997 | border = FT_STROKER_BORDER_RIGHT; |
1998 | else |
1999 | border = FT_STROKER_BORDER_LEFT; |
2000 | } |
2001 | |
2002 | error = FT_Stroker_ParseOutline( stroker, outline, FALSE0 ); |
2003 | if ( error ) |
2004 | goto Fail; |
2005 | |
2006 | (void)FT_Stroker_GetBorderCounts( stroker, border, |
2007 | &num_points, &num_contours ); |
2008 | |
2009 | FT_Outline_Done( glyph->library, outline ); |
2010 | |
2011 | error = FT_Outline_New( glyph->library, |
2012 | num_points, |
2013 | num_contours, |
2014 | outline ); |
2015 | if ( error ) |
2016 | goto Fail; |
2017 | |
2018 | outline->n_points = 0; |
2019 | outline->n_contours = 0; |
2020 | |
2021 | FT_Stroker_ExportBorder( stroker, border, outline ); |
2022 | } |
2023 | |
2024 | if ( destroy ) |
2025 | FT_Done_Glyph( *pglyph ); |
2026 | |
2027 | *pglyph = glyph; |
2028 | goto Exit; |
2029 | |
2030 | Fail: |
2031 | FT_Done_Glyph( glyph ); |
2032 | glyph = NULL((void*)0); |
2033 | |
2034 | if ( !destroy ) |
2035 | *pglyph = NULL((void*)0); |
2036 | |
2037 | Exit: |
2038 | return error; |
2039 | } |
2040 | |
2041 | |
2042 | /* END */ |