|
54876
|
1 |
/****************************************************************************
|
|
|
2 |
*
|
|
|
3 |
* ftstroke.c
|
|
|
4 |
*
|
|
|
5 |
* FreeType path stroker (body).
|
|
|
6 |
*
|
|
|
7 |
* Copyright (C) 2002-2019 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 |
*/
|
|
49234
|
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 |
|
|
54876
|
27 |
|
|
|
28 |
/* declare an extern to access `ft_outline_glyph_class' globally */
|
|
|
29 |
/* allocated in `ftglyph.c' */
|
|
49234
|
30 |
FT_CALLBACK_TABLE const FT_Glyph_Class ft_outline_glyph_class;
|
|
|
31 |
|
|
|
32 |
|
|
|
33 |
/* documentation is in ftstroke.h */
|
|
|
34 |
|
|
|
35 |
FT_EXPORT_DEF( FT_StrokerBorder )
|
|
|
36 |
FT_Outline_GetInsideBorder( FT_Outline* outline )
|
|
|
37 |
{
|
|
|
38 |
FT_Orientation o = FT_Outline_Get_Orientation( outline );
|
|
|
39 |
|
|
|
40 |
|
|
|
41 |
return o == FT_ORIENTATION_TRUETYPE ? FT_STROKER_BORDER_RIGHT
|
|
|
42 |
: FT_STROKER_BORDER_LEFT;
|
|
|
43 |
}
|
|
|
44 |
|
|
|
45 |
|
|
|
46 |
/* documentation is in ftstroke.h */
|
|
|
47 |
|
|
|
48 |
FT_EXPORT_DEF( FT_StrokerBorder )
|
|
|
49 |
FT_Outline_GetOutsideBorder( FT_Outline* outline )
|
|
|
50 |
{
|
|
|
51 |
FT_Orientation o = FT_Outline_Get_Orientation( outline );
|
|
|
52 |
|
|
|
53 |
|
|
|
54 |
return o == FT_ORIENTATION_TRUETYPE ? FT_STROKER_BORDER_LEFT
|
|
|
55 |
: FT_STROKER_BORDER_RIGHT;
|
|
|
56 |
}
|
|
|
57 |
|
|
|
58 |
|
|
|
59 |
/*************************************************************************/
|
|
|
60 |
/*************************************************************************/
|
|
|
61 |
/***** *****/
|
|
|
62 |
/***** BEZIER COMPUTATIONS *****/
|
|
|
63 |
/***** *****/
|
|
|
64 |
/*************************************************************************/
|
|
|
65 |
/*************************************************************************/
|
|
|
66 |
|
|
|
67 |
#define FT_SMALL_CONIC_THRESHOLD ( FT_ANGLE_PI / 6 )
|
|
|
68 |
#define FT_SMALL_CUBIC_THRESHOLD ( FT_ANGLE_PI / 8 )
|
|
|
69 |
|
|
|
70 |
#define FT_EPSILON 2
|
|
|
71 |
|
|
|
72 |
#define FT_IS_SMALL( x ) ( (x) > -FT_EPSILON && (x) < FT_EPSILON )
|
|
|
73 |
|
|
|
74 |
|
|
|
75 |
static FT_Pos
|
|
|
76 |
ft_pos_abs( FT_Pos x )
|
|
|
77 |
{
|
|
|
78 |
return x >= 0 ? x : -x;
|
|
|
79 |
}
|
|
|
80 |
|
|
|
81 |
|
|
|
82 |
static void
|
|
|
83 |
ft_conic_split( FT_Vector* base )
|
|
|
84 |
{
|
|
|
85 |
FT_Pos a, b;
|
|
|
86 |
|
|
|
87 |
|
|
|
88 |
base[4].x = base[2].x;
|
|
|
89 |
b = base[1].x;
|
|
|
90 |
a = base[3].x = ( base[2].x + b ) / 2;
|
|
|
91 |
b = base[1].x = ( base[0].x + b ) / 2;
|
|
|
92 |
base[2].x = ( a + b ) / 2;
|
|
|
93 |
|
|
|
94 |
base[4].y = base[2].y;
|
|
|
95 |
b = base[1].y;
|
|
|
96 |
a = base[3].y = ( base[2].y + b ) / 2;
|
|
|
97 |
b = base[1].y = ( base[0].y + b ) / 2;
|
|
|
98 |
base[2].y = ( a + b ) / 2;
|
|
|
99 |
}
|
|
|
100 |
|
|
|
101 |
|
|
|
102 |
static FT_Bool
|
|
|
103 |
ft_conic_is_small_enough( FT_Vector* base,
|
|
|
104 |
FT_Angle *angle_in,
|
|
|
105 |
FT_Angle *angle_out )
|
|
|
106 |
{
|
|
|
107 |
FT_Vector d1, d2;
|
|
|
108 |
FT_Angle theta;
|
|
|
109 |
FT_Int close1, close2;
|
|
|
110 |
|
|
|
111 |
|
|
|
112 |
d1.x = base[1].x - base[2].x;
|
|
|
113 |
d1.y = base[1].y - base[2].y;
|
|
|
114 |
d2.x = base[0].x - base[1].x;
|
|
|
115 |
d2.y = base[0].y - base[1].y;
|
|
|
116 |
|
|
|
117 |
close1 = FT_IS_SMALL( d1.x ) && FT_IS_SMALL( d1.y );
|
|
|
118 |
close2 = FT_IS_SMALL( d2.x ) && FT_IS_SMALL( d2.y );
|
|
|
119 |
|
|
|
120 |
if ( close1 )
|
|
|
121 |
{
|
|
|
122 |
if ( close2 )
|
|
|
123 |
{
|
|
|
124 |
/* basically a point; */
|
|
|
125 |
/* do nothing to retain original direction */
|
|
|
126 |
}
|
|
|
127 |
else
|
|
|
128 |
{
|
|
|
129 |
*angle_in =
|
|
|
130 |
*angle_out = FT_Atan2( d2.x, d2.y );
|
|
|
131 |
}
|
|
|
132 |
}
|
|
|
133 |
else /* !close1 */
|
|
|
134 |
{
|
|
|
135 |
if ( close2 )
|
|
|
136 |
{
|
|
|
137 |
*angle_in =
|
|
|
138 |
*angle_out = FT_Atan2( d1.x, d1.y );
|
|
|
139 |
}
|
|
|
140 |
else
|
|
|
141 |
{
|
|
|
142 |
*angle_in = FT_Atan2( d1.x, d1.y );
|
|
|
143 |
*angle_out = FT_Atan2( d2.x, d2.y );
|
|
|
144 |
}
|
|
|
145 |
}
|
|
|
146 |
|
|
|
147 |
theta = ft_pos_abs( FT_Angle_Diff( *angle_in, *angle_out ) );
|
|
|
148 |
|
|
|
149 |
return FT_BOOL( theta < FT_SMALL_CONIC_THRESHOLD );
|
|
|
150 |
}
|
|
|
151 |
|
|
|
152 |
|
|
|
153 |
static void
|
|
|
154 |
ft_cubic_split( FT_Vector* base )
|
|
|
155 |
{
|
|
|
156 |
FT_Pos a, b, c, d;
|
|
|
157 |
|
|
|
158 |
|
|
|
159 |
base[6].x = base[3].x;
|
|
|
160 |
c = base[1].x;
|
|
|
161 |
d = base[2].x;
|
|
|
162 |
base[1].x = a = ( base[0].x + c ) / 2;
|
|
|
163 |
base[5].x = b = ( base[3].x + d ) / 2;
|
|
|
164 |
c = ( c + d ) / 2;
|
|
|
165 |
base[2].x = a = ( a + c ) / 2;
|
|
|
166 |
base[4].x = b = ( b + c ) / 2;
|
|
|
167 |
base[3].x = ( a + b ) / 2;
|
|
|
168 |
|
|
|
169 |
base[6].y = base[3].y;
|
|
|
170 |
c = base[1].y;
|
|
|
171 |
d = base[2].y;
|
|
|
172 |
base[1].y = a = ( base[0].y + c ) / 2;
|
|
|
173 |
base[5].y = b = ( base[3].y + d ) / 2;
|
|
|
174 |
c = ( c + d ) / 2;
|
|
|
175 |
base[2].y = a = ( a + c ) / 2;
|
|
|
176 |
base[4].y = b = ( b + c ) / 2;
|
|
|
177 |
base[3].y = ( a + b ) / 2;
|
|
|
178 |
}
|
|
|
179 |
|
|
|
180 |
|
|
|
181 |
/* Return the average of `angle1' and `angle2'. */
|
|
|
182 |
/* This gives correct result even if `angle1' and `angle2' */
|
|
|
183 |
/* have opposite signs. */
|
|
|
184 |
static FT_Angle
|
|
|
185 |
ft_angle_mean( FT_Angle angle1,
|
|
|
186 |
FT_Angle angle2 )
|
|
|
187 |
{
|
|
|
188 |
return angle1 + FT_Angle_Diff( angle1, angle2 ) / 2;
|
|
|
189 |
}
|
|
|
190 |
|
|
|
191 |
|
|
|
192 |
static FT_Bool
|
|
|
193 |
ft_cubic_is_small_enough( FT_Vector* base,
|
|
|
194 |
FT_Angle *angle_in,
|
|
|
195 |
FT_Angle *angle_mid,
|
|
|
196 |
FT_Angle *angle_out )
|
|
|
197 |
{
|
|
|
198 |
FT_Vector d1, d2, d3;
|
|
|
199 |
FT_Angle theta1, theta2;
|
|
|
200 |
FT_Int close1, close2, close3;
|
|
|
201 |
|
|
|
202 |
|
|
|
203 |
d1.x = base[2].x - base[3].x;
|
|
|
204 |
d1.y = base[2].y - base[3].y;
|
|
|
205 |
d2.x = base[1].x - base[2].x;
|
|
|
206 |
d2.y = base[1].y - base[2].y;
|
|
|
207 |
d3.x = base[0].x - base[1].x;
|
|
|
208 |
d3.y = base[0].y - base[1].y;
|
|
|
209 |
|
|
|
210 |
close1 = FT_IS_SMALL( d1.x ) && FT_IS_SMALL( d1.y );
|
|
|
211 |
close2 = FT_IS_SMALL( d2.x ) && FT_IS_SMALL( d2.y );
|
|
|
212 |
close3 = FT_IS_SMALL( d3.x ) && FT_IS_SMALL( d3.y );
|
|
|
213 |
|
|
|
214 |
if ( close1 )
|
|
|
215 |
{
|
|
|
216 |
if ( close2 )
|
|
|
217 |
{
|
|
|
218 |
if ( close3 )
|
|
|
219 |
{
|
|
|
220 |
/* basically a point; */
|
|
|
221 |
/* do nothing to retain original direction */
|
|
|
222 |
}
|
|
|
223 |
else /* !close3 */
|
|
|
224 |
{
|
|
|
225 |
*angle_in =
|
|
|
226 |
*angle_mid =
|
|
|
227 |
*angle_out = FT_Atan2( d3.x, d3.y );
|
|
|
228 |
}
|
|
|
229 |
}
|
|
|
230 |
else /* !close2 */
|
|
|
231 |
{
|
|
|
232 |
if ( close3 )
|
|
|
233 |
{
|
|
|
234 |
*angle_in =
|
|
|
235 |
*angle_mid =
|
|
|
236 |
*angle_out = FT_Atan2( d2.x, d2.y );
|
|
|
237 |
}
|
|
|
238 |
else /* !close3 */
|
|
|
239 |
{
|
|
|
240 |
*angle_in =
|
|
|
241 |
*angle_mid = FT_Atan2( d2.x, d2.y );
|
|
|
242 |
*angle_out = FT_Atan2( d3.x, d3.y );
|
|
|
243 |
}
|
|
|
244 |
}
|
|
|
245 |
}
|
|
|
246 |
else /* !close1 */
|
|
|
247 |
{
|
|
|
248 |
if ( close2 )
|
|
|
249 |
{
|
|
|
250 |
if ( close3 )
|
|
|
251 |
{
|
|
|
252 |
*angle_in =
|
|
|
253 |
*angle_mid =
|
|
|
254 |
*angle_out = FT_Atan2( d1.x, d1.y );
|
|
|
255 |
}
|
|
|
256 |
else /* !close3 */
|
|
|
257 |
{
|
|
|
258 |
*angle_in = FT_Atan2( d1.x, d1.y );
|
|
|
259 |
*angle_out = FT_Atan2( d3.x, d3.y );
|
|
|
260 |
*angle_mid = ft_angle_mean( *angle_in, *angle_out );
|
|
|
261 |
}
|
|
|
262 |
}
|
|
|
263 |
else /* !close2 */
|
|
|
264 |
{
|
|
|
265 |
if ( close3 )
|
|
|
266 |
{
|
|
|
267 |
*angle_in = FT_Atan2( d1.x, d1.y );
|
|
|
268 |
*angle_mid =
|
|
|
269 |
*angle_out = FT_Atan2( d2.x, d2.y );
|
|
|
270 |
}
|
|
|
271 |
else /* !close3 */
|
|
|
272 |
{
|
|
|
273 |
*angle_in = FT_Atan2( d1.x, d1.y );
|
|
|
274 |
*angle_mid = FT_Atan2( d2.x, d2.y );
|
|
|
275 |
*angle_out = FT_Atan2( d3.x, d3.y );
|
|
|
276 |
}
|
|
|
277 |
}
|
|
|
278 |
}
|
|
|
279 |
|
|
|
280 |
theta1 = ft_pos_abs( FT_Angle_Diff( *angle_in, *angle_mid ) );
|
|
|
281 |
theta2 = ft_pos_abs( FT_Angle_Diff( *angle_mid, *angle_out ) );
|
|
|
282 |
|
|
|
283 |
return FT_BOOL( theta1 < FT_SMALL_CUBIC_THRESHOLD &&
|
|
|
284 |
theta2 < FT_SMALL_CUBIC_THRESHOLD );
|
|
|
285 |
}
|
|
|
286 |
|
|
|
287 |
|
|
|
288 |
/*************************************************************************/
|
|
|
289 |
/*************************************************************************/
|
|
|
290 |
/***** *****/
|
|
|
291 |
/***** STROKE BORDERS *****/
|
|
|
292 |
/***** *****/
|
|
|
293 |
/*************************************************************************/
|
|
|
294 |
/*************************************************************************/
|
|
|
295 |
|
|
|
296 |
typedef enum FT_StrokeTags_
|
|
|
297 |
{
|
|
|
298 |
FT_STROKE_TAG_ON = 1, /* on-curve point */
|
|
|
299 |
FT_STROKE_TAG_CUBIC = 2, /* cubic off-point */
|
|
|
300 |
FT_STROKE_TAG_BEGIN = 4, /* sub-path start */
|
|
|
301 |
FT_STROKE_TAG_END = 8 /* sub-path end */
|
|
|
302 |
|
|
|
303 |
} FT_StrokeTags;
|
|
|
304 |
|
|
|
305 |
#define FT_STROKE_TAG_BEGIN_END ( FT_STROKE_TAG_BEGIN | FT_STROKE_TAG_END )
|
|
|
306 |
|
|
|
307 |
typedef struct FT_StrokeBorderRec_
|
|
|
308 |
{
|
|
|
309 |
FT_UInt num_points;
|
|
|
310 |
FT_UInt max_points;
|
|
|
311 |
FT_Vector* points;
|
|
|
312 |
FT_Byte* tags;
|
|
|
313 |
FT_Bool movable; /* TRUE for ends of lineto borders */
|
|
|
314 |
FT_Int start; /* index of current sub-path start point */
|
|
|
315 |
FT_Memory memory;
|
|
|
316 |
FT_Bool valid;
|
|
|
317 |
|
|
|
318 |
} FT_StrokeBorderRec, *FT_StrokeBorder;
|
|
|
319 |
|
|
|
320 |
|
|
|
321 |
static FT_Error
|
|
|
322 |
ft_stroke_border_grow( FT_StrokeBorder border,
|
|
|
323 |
FT_UInt new_points )
|
|
|
324 |
{
|
|
|
325 |
FT_UInt old_max = border->max_points;
|
|
|
326 |
FT_UInt new_max = border->num_points + new_points;
|
|
|
327 |
FT_Error error = FT_Err_Ok;
|
|
|
328 |
|
|
|
329 |
|
|
|
330 |
if ( new_max > old_max )
|
|
|
331 |
{
|
|
|
332 |
FT_UInt cur_max = old_max;
|
|
|
333 |
FT_Memory memory = border->memory;
|
|
|
334 |
|
|
|
335 |
|
|
|
336 |
while ( cur_max < new_max )
|
|
|
337 |
cur_max += ( cur_max >> 1 ) + 16;
|
|
|
338 |
|
|
|
339 |
if ( FT_RENEW_ARRAY( border->points, old_max, cur_max ) ||
|
|
|
340 |
FT_RENEW_ARRAY( border->tags, old_max, cur_max ) )
|
|
|
341 |
goto Exit;
|
|
|
342 |
|
|
|
343 |
border->max_points = cur_max;
|
|
|
344 |
}
|
|
|
345 |
|
|
|
346 |
Exit:
|
|
|
347 |
return error;
|
|
|
348 |
}
|
|
|
349 |
|
|
|
350 |
|
|
|
351 |
static void
|
|
|
352 |
ft_stroke_border_close( FT_StrokeBorder border,
|
|
|
353 |
FT_Bool reverse )
|
|
|
354 |
{
|
|
|
355 |
FT_UInt start = (FT_UInt)border->start;
|
|
|
356 |
FT_UInt count = border->num_points;
|
|
|
357 |
|
|
|
358 |
|
|
|
359 |
FT_ASSERT( border->start >= 0 );
|
|
|
360 |
|
|
|
361 |
/* don't record empty paths! */
|
|
|
362 |
if ( count <= start + 1U )
|
|
|
363 |
border->num_points = start;
|
|
|
364 |
else
|
|
|
365 |
{
|
|
|
366 |
/* copy the last point to the start of this sub-path, since */
|
|
|
367 |
/* it contains the `adjusted' starting coordinates */
|
|
|
368 |
border->num_points = --count;
|
|
|
369 |
border->points[start] = border->points[count];
|
|
54876
|
370 |
border->tags[start] = border->tags[count];
|
|
49234
|
371 |
|
|
|
372 |
if ( reverse )
|
|
|
373 |
{
|
|
|
374 |
/* reverse the points */
|
|
|
375 |
{
|
|
|
376 |
FT_Vector* vec1 = border->points + start + 1;
|
|
|
377 |
FT_Vector* vec2 = border->points + count - 1;
|
|
|
378 |
|
|
|
379 |
|
|
|
380 |
for ( ; vec1 < vec2; vec1++, vec2-- )
|
|
|
381 |
{
|
|
|
382 |
FT_Vector tmp;
|
|
|
383 |
|
|
|
384 |
|
|
|
385 |
tmp = *vec1;
|
|
|
386 |
*vec1 = *vec2;
|
|
|
387 |
*vec2 = tmp;
|
|
|
388 |
}
|
|
|
389 |
}
|
|
|
390 |
|
|
|
391 |
/* then the tags */
|
|
|
392 |
{
|
|
|
393 |
FT_Byte* tag1 = border->tags + start + 1;
|
|
|
394 |
FT_Byte* tag2 = border->tags + count - 1;
|
|
|
395 |
|
|
|
396 |
|
|
|
397 |
for ( ; tag1 < tag2; tag1++, tag2-- )
|
|
|
398 |
{
|
|
|
399 |
FT_Byte tmp;
|
|
|
400 |
|
|
|
401 |
|
|
|
402 |
tmp = *tag1;
|
|
|
403 |
*tag1 = *tag2;
|
|
|
404 |
*tag2 = tmp;
|
|
|
405 |
}
|
|
|
406 |
}
|
|
|
407 |
}
|
|
|
408 |
|
|
|
409 |
border->tags[start ] |= FT_STROKE_TAG_BEGIN;
|
|
|
410 |
border->tags[count - 1] |= FT_STROKE_TAG_END;
|
|
|
411 |
}
|
|
|
412 |
|
|
|
413 |
border->start = -1;
|
|
|
414 |
border->movable = FALSE;
|
|
|
415 |
}
|
|
|
416 |
|
|
|
417 |
|
|
|
418 |
static FT_Error
|
|
|
419 |
ft_stroke_border_lineto( FT_StrokeBorder border,
|
|
|
420 |
FT_Vector* to,
|
|
|
421 |
FT_Bool movable )
|
|
|
422 |
{
|
|
|
423 |
FT_Error error = FT_Err_Ok;
|
|
|
424 |
|
|
|
425 |
|
|
|
426 |
FT_ASSERT( border->start >= 0 );
|
|
|
427 |
|
|
|
428 |
if ( border->movable )
|
|
|
429 |
{
|
|
|
430 |
/* move last point */
|
|
|
431 |
border->points[border->num_points - 1] = *to;
|
|
|
432 |
}
|
|
|
433 |
else
|
|
|
434 |
{
|
|
54876
|
435 |
/* don't add zero-length lineto, but always add moveto */
|
|
|
436 |
if ( border->num_points > (FT_UInt)border->start &&
|
|
49234
|
437 |
FT_IS_SMALL( border->points[border->num_points - 1].x - to->x ) &&
|
|
|
438 |
FT_IS_SMALL( border->points[border->num_points - 1].y - to->y ) )
|
|
|
439 |
return error;
|
|
|
440 |
|
|
|
441 |
/* add one point */
|
|
|
442 |
error = ft_stroke_border_grow( border, 1 );
|
|
|
443 |
if ( !error )
|
|
|
444 |
{
|
|
|
445 |
FT_Vector* vec = border->points + border->num_points;
|
|
|
446 |
FT_Byte* tag = border->tags + border->num_points;
|
|
|
447 |
|
|
|
448 |
|
|
|
449 |
vec[0] = *to;
|
|
|
450 |
tag[0] = FT_STROKE_TAG_ON;
|
|
|
451 |
|
|
|
452 |
border->num_points += 1;
|
|
|
453 |
}
|
|
|
454 |
}
|
|
|
455 |
border->movable = movable;
|
|
|
456 |
return error;
|
|
|
457 |
}
|
|
|
458 |
|
|
|
459 |
|
|
|
460 |
static FT_Error
|
|
|
461 |
ft_stroke_border_conicto( FT_StrokeBorder border,
|
|
|
462 |
FT_Vector* control,
|
|
|
463 |
FT_Vector* to )
|
|
|
464 |
{
|
|
|
465 |
FT_Error error;
|
|
|
466 |
|
|
|
467 |
|
|
|
468 |
FT_ASSERT( border->start >= 0 );
|
|
|
469 |
|
|
|
470 |
error = ft_stroke_border_grow( border, 2 );
|
|
|
471 |
if ( !error )
|
|
|
472 |
{
|
|
|
473 |
FT_Vector* vec = border->points + border->num_points;
|
|
|
474 |
FT_Byte* tag = border->tags + border->num_points;
|
|
|
475 |
|
|
|
476 |
|
|
|
477 |
vec[0] = *control;
|
|
|
478 |
vec[1] = *to;
|
|
|
479 |
|
|
|
480 |
tag[0] = 0;
|
|
|
481 |
tag[1] = FT_STROKE_TAG_ON;
|
|
|
482 |
|
|
|
483 |
border->num_points += 2;
|
|
|
484 |
}
|
|
|
485 |
|
|
|
486 |
border->movable = FALSE;
|
|
|
487 |
|
|
|
488 |
return error;
|
|
|
489 |
}
|
|
|
490 |
|
|
|
491 |
|
|
|
492 |
static FT_Error
|
|
|
493 |
ft_stroke_border_cubicto( FT_StrokeBorder border,
|
|
|
494 |
FT_Vector* control1,
|
|
|
495 |
FT_Vector* control2,
|
|
|
496 |
FT_Vector* to )
|
|
|
497 |
{
|
|
|
498 |
FT_Error error;
|
|
|
499 |
|
|
|
500 |
|
|
|
501 |
FT_ASSERT( border->start >= 0 );
|
|
|
502 |
|
|
|
503 |
error = ft_stroke_border_grow( border, 3 );
|
|
|
504 |
if ( !error )
|
|
|
505 |
{
|
|
|
506 |
FT_Vector* vec = border->points + border->num_points;
|
|
|
507 |
FT_Byte* tag = border->tags + border->num_points;
|
|
|
508 |
|
|
|
509 |
|
|
|
510 |
vec[0] = *control1;
|
|
|
511 |
vec[1] = *control2;
|
|
|
512 |
vec[2] = *to;
|
|
|
513 |
|
|
|
514 |
tag[0] = FT_STROKE_TAG_CUBIC;
|
|
|
515 |
tag[1] = FT_STROKE_TAG_CUBIC;
|
|
|
516 |
tag[2] = FT_STROKE_TAG_ON;
|
|
|
517 |
|
|
|
518 |
border->num_points += 3;
|
|
|
519 |
}
|
|
|
520 |
|
|
|
521 |
border->movable = FALSE;
|
|
|
522 |
|
|
|
523 |
return error;
|
|
|
524 |
}
|
|
|
525 |
|
|
|
526 |
|
|
|
527 |
#define FT_ARC_CUBIC_ANGLE ( FT_ANGLE_PI / 2 )
|
|
|
528 |
|
|
|
529 |
|
|
|
530 |
static FT_Error
|
|
|
531 |
ft_stroke_border_arcto( FT_StrokeBorder border,
|
|
|
532 |
FT_Vector* center,
|
|
|
533 |
FT_Fixed radius,
|
|
|
534 |
FT_Angle angle_start,
|
|
|
535 |
FT_Angle angle_diff )
|
|
|
536 |
{
|
|
|
537 |
FT_Angle total, angle, step, rotate, next, theta;
|
|
|
538 |
FT_Vector a, b, a2, b2;
|
|
|
539 |
FT_Fixed length;
|
|
|
540 |
FT_Error error = FT_Err_Ok;
|
|
|
541 |
|
|
|
542 |
|
|
|
543 |
/* compute start point */
|
|
|
544 |
FT_Vector_From_Polar( &a, radius, angle_start );
|
|
|
545 |
a.x += center->x;
|
|
|
546 |
a.y += center->y;
|
|
|
547 |
|
|
|
548 |
total = angle_diff;
|
|
|
549 |
angle = angle_start;
|
|
|
550 |
rotate = ( angle_diff >= 0 ) ? FT_ANGLE_PI2 : -FT_ANGLE_PI2;
|
|
|
551 |
|
|
|
552 |
while ( total != 0 )
|
|
|
553 |
{
|
|
|
554 |
step = total;
|
|
|
555 |
if ( step > FT_ARC_CUBIC_ANGLE )
|
|
|
556 |
step = FT_ARC_CUBIC_ANGLE;
|
|
|
557 |
|
|
|
558 |
else if ( step < -FT_ARC_CUBIC_ANGLE )
|
|
|
559 |
step = -FT_ARC_CUBIC_ANGLE;
|
|
|
560 |
|
|
|
561 |
next = angle + step;
|
|
|
562 |
theta = step;
|
|
|
563 |
if ( theta < 0 )
|
|
|
564 |
theta = -theta;
|
|
|
565 |
|
|
|
566 |
theta >>= 1;
|
|
|
567 |
|
|
|
568 |
/* compute end point */
|
|
|
569 |
FT_Vector_From_Polar( &b, radius, next );
|
|
|
570 |
b.x += center->x;
|
|
|
571 |
b.y += center->y;
|
|
|
572 |
|
|
|
573 |
/* compute first and second control points */
|
|
|
574 |
length = FT_MulDiv( radius, FT_Sin( theta ) * 4,
|
|
|
575 |
( 0x10000L + FT_Cos( theta ) ) * 3 );
|
|
|
576 |
|
|
|
577 |
FT_Vector_From_Polar( &a2, length, angle + rotate );
|
|
|
578 |
a2.x += a.x;
|
|
|
579 |
a2.y += a.y;
|
|
|
580 |
|
|
|
581 |
FT_Vector_From_Polar( &b2, length, next - rotate );
|
|
|
582 |
b2.x += b.x;
|
|
|
583 |
b2.y += b.y;
|
|
|
584 |
|
|
|
585 |
/* add cubic arc */
|
|
|
586 |
error = ft_stroke_border_cubicto( border, &a2, &b2, &b );
|
|
|
587 |
if ( error )
|
|
|
588 |
break;
|
|
|
589 |
|
|
|
590 |
/* process the rest of the arc ?? */
|
|
|
591 |
a = b;
|
|
|
592 |
total -= step;
|
|
|
593 |
angle = next;
|
|
|
594 |
}
|
|
|
595 |
|
|
|
596 |
return error;
|
|
|
597 |
}
|
|
|
598 |
|
|
|
599 |
|
|
|
600 |
static FT_Error
|
|
|
601 |
ft_stroke_border_moveto( FT_StrokeBorder border,
|
|
|
602 |
FT_Vector* to )
|
|
|
603 |
{
|
|
|
604 |
/* close current open path if any ? */
|
|
|
605 |
if ( border->start >= 0 )
|
|
|
606 |
ft_stroke_border_close( border, FALSE );
|
|
|
607 |
|
|
|
608 |
border->start = (FT_Int)border->num_points;
|
|
|
609 |
border->movable = FALSE;
|
|
|
610 |
|
|
|
611 |
return ft_stroke_border_lineto( border, to, FALSE );
|
|
|
612 |
}
|
|
|
613 |
|
|
|
614 |
|
|
|
615 |
static void
|
|
|
616 |
ft_stroke_border_init( FT_StrokeBorder border,
|
|
|
617 |
FT_Memory memory )
|
|
|
618 |
{
|
|
|
619 |
border->memory = memory;
|
|
|
620 |
border->points = NULL;
|
|
|
621 |
border->tags = NULL;
|
|
|
622 |
|
|
|
623 |
border->num_points = 0;
|
|
|
624 |
border->max_points = 0;
|
|
|
625 |
border->start = -1;
|
|
|
626 |
border->valid = FALSE;
|
|
|
627 |
}
|
|
|
628 |
|
|
|
629 |
|
|
|
630 |
static void
|
|
|
631 |
ft_stroke_border_reset( FT_StrokeBorder border )
|
|
|
632 |
{
|
|
|
633 |
border->num_points = 0;
|
|
|
634 |
border->start = -1;
|
|
|
635 |
border->valid = FALSE;
|
|
|
636 |
}
|
|
|
637 |
|
|
|
638 |
|
|
|
639 |
static void
|
|
|
640 |
ft_stroke_border_done( FT_StrokeBorder border )
|
|
|
641 |
{
|
|
|
642 |
FT_Memory memory = border->memory;
|
|
|
643 |
|
|
|
644 |
|
|
|
645 |
FT_FREE( border->points );
|
|
|
646 |
FT_FREE( border->tags );
|
|
|
647 |
|
|
|
648 |
border->num_points = 0;
|
|
|
649 |
border->max_points = 0;
|
|
|
650 |
border->start = -1;
|
|
|
651 |
border->valid = FALSE;
|
|
|
652 |
}
|
|
|
653 |
|
|
|
654 |
|
|
|
655 |
static FT_Error
|
|
|
656 |
ft_stroke_border_get_counts( FT_StrokeBorder border,
|
|
|
657 |
FT_UInt *anum_points,
|
|
|
658 |
FT_UInt *anum_contours )
|
|
|
659 |
{
|
|
|
660 |
FT_Error error = FT_Err_Ok;
|
|
|
661 |
FT_UInt num_points = 0;
|
|
|
662 |
FT_UInt num_contours = 0;
|
|
|
663 |
|
|
|
664 |
FT_UInt count = border->num_points;
|
|
|
665 |
FT_Vector* point = border->points;
|
|
|
666 |
FT_Byte* tags = border->tags;
|
|
|
667 |
FT_Int in_contour = 0;
|
|
|
668 |
|
|
|
669 |
|
|
|
670 |
for ( ; count > 0; count--, num_points++, point++, tags++ )
|
|
|
671 |
{
|
|
|
672 |
if ( tags[0] & FT_STROKE_TAG_BEGIN )
|
|
|
673 |
{
|
|
|
674 |
if ( in_contour != 0 )
|
|
|
675 |
goto Fail;
|
|
|
676 |
|
|
|
677 |
in_contour = 1;
|
|
|
678 |
}
|
|
|
679 |
else if ( in_contour == 0 )
|
|
|
680 |
goto Fail;
|
|
|
681 |
|
|
|
682 |
if ( tags[0] & FT_STROKE_TAG_END )
|
|
|
683 |
{
|
|
|
684 |
in_contour = 0;
|
|
|
685 |
num_contours++;
|
|
|
686 |
}
|
|
|
687 |
}
|
|
|
688 |
|
|
|
689 |
if ( in_contour != 0 )
|
|
|
690 |
goto Fail;
|
|
|
691 |
|
|
|
692 |
border->valid = TRUE;
|
|
|
693 |
|
|
|
694 |
Exit:
|
|
|
695 |
*anum_points = num_points;
|
|
|
696 |
*anum_contours = num_contours;
|
|
|
697 |
return error;
|
|
|
698 |
|
|
|
699 |
Fail:
|
|
|
700 |
num_points = 0;
|
|
|
701 |
num_contours = 0;
|
|
|
702 |
goto Exit;
|
|
|
703 |
}
|
|
|
704 |
|
|
|
705 |
|
|
|
706 |
static void
|
|
|
707 |
ft_stroke_border_export( FT_StrokeBorder border,
|
|
|
708 |
FT_Outline* outline )
|
|
|
709 |
{
|
|
|
710 |
/* copy point locations */
|
|
|
711 |
if ( border->num_points )
|
|
|
712 |
FT_ARRAY_COPY( outline->points + outline->n_points,
|
|
|
713 |
border->points,
|
|
|
714 |
border->num_points );
|
|
|
715 |
|
|
|
716 |
/* copy tags */
|
|
|
717 |
{
|
|
|
718 |
FT_UInt count = border->num_points;
|
|
|
719 |
FT_Byte* read = border->tags;
|
|
|
720 |
FT_Byte* write = (FT_Byte*)outline->tags + outline->n_points;
|
|
|
721 |
|
|
|
722 |
|
|
|
723 |
for ( ; count > 0; count--, read++, write++ )
|
|
|
724 |
{
|
|
|
725 |
if ( *read & FT_STROKE_TAG_ON )
|
|
|
726 |
*write = FT_CURVE_TAG_ON;
|
|
|
727 |
else if ( *read & FT_STROKE_TAG_CUBIC )
|
|
|
728 |
*write = FT_CURVE_TAG_CUBIC;
|
|
|
729 |
else
|
|
|
730 |
*write = FT_CURVE_TAG_CONIC;
|
|
|
731 |
}
|
|
|
732 |
}
|
|
|
733 |
|
|
|
734 |
/* copy contours */
|
|
|
735 |
{
|
|
|
736 |
FT_UInt count = border->num_points;
|
|
|
737 |
FT_Byte* tags = border->tags;
|
|
|
738 |
FT_Short* write = outline->contours + outline->n_contours;
|
|
|
739 |
FT_Short idx = (FT_Short)outline->n_points;
|
|
|
740 |
|
|
|
741 |
|
|
|
742 |
for ( ; count > 0; count--, tags++, idx++ )
|
|
|
743 |
{
|
|
|
744 |
if ( *tags & FT_STROKE_TAG_END )
|
|
|
745 |
{
|
|
|
746 |
*write++ = idx;
|
|
|
747 |
outline->n_contours++;
|
|
|
748 |
}
|
|
|
749 |
}
|
|
|
750 |
}
|
|
|
751 |
|
|
|
752 |
outline->n_points += (short)border->num_points;
|
|
|
753 |
|
|
|
754 |
FT_ASSERT( FT_Outline_Check( outline ) == 0 );
|
|
|
755 |
}
|
|
|
756 |
|
|
|
757 |
|
|
|
758 |
/*************************************************************************/
|
|
|
759 |
/*************************************************************************/
|
|
|
760 |
/***** *****/
|
|
|
761 |
/***** STROKER *****/
|
|
|
762 |
/***** *****/
|
|
|
763 |
/*************************************************************************/
|
|
|
764 |
/*************************************************************************/
|
|
|
765 |
|
|
|
766 |
#define FT_SIDE_TO_ROTATE( s ) ( FT_ANGLE_PI2 - (s) * FT_ANGLE_PI )
|
|
|
767 |
|
|
|
768 |
typedef struct FT_StrokerRec_
|
|
|
769 |
{
|
|
|
770 |
FT_Angle angle_in; /* direction into curr join */
|
|
|
771 |
FT_Angle angle_out; /* direction out of join */
|
|
|
772 |
FT_Vector center; /* current position */
|
|
|
773 |
FT_Fixed line_length; /* length of last lineto */
|
|
|
774 |
FT_Bool first_point; /* is this the start? */
|
|
|
775 |
FT_Bool subpath_open; /* is the subpath open? */
|
|
|
776 |
FT_Angle subpath_angle; /* subpath start direction */
|
|
|
777 |
FT_Vector subpath_start; /* subpath start position */
|
|
|
778 |
FT_Fixed subpath_line_length; /* subpath start lineto len */
|
|
|
779 |
FT_Bool handle_wide_strokes; /* use wide strokes logic? */
|
|
|
780 |
|
|
|
781 |
FT_Stroker_LineCap line_cap;
|
|
|
782 |
FT_Stroker_LineJoin line_join;
|
|
|
783 |
FT_Stroker_LineJoin line_join_saved;
|
|
|
784 |
FT_Fixed miter_limit;
|
|
|
785 |
FT_Fixed radius;
|
|
|
786 |
|
|
|
787 |
FT_StrokeBorderRec borders[2];
|
|
|
788 |
FT_Library library;
|
|
|
789 |
|
|
|
790 |
} FT_StrokerRec;
|
|
|
791 |
|
|
|
792 |
|
|
|
793 |
/* documentation is in ftstroke.h */
|
|
|
794 |
|
|
|
795 |
FT_EXPORT_DEF( FT_Error )
|
|
|
796 |
FT_Stroker_New( FT_Library library,
|
|
|
797 |
FT_Stroker *astroker )
|
|
|
798 |
{
|
|
|
799 |
FT_Error error; /* assigned in FT_NEW */
|
|
|
800 |
FT_Memory memory;
|
|
|
801 |
FT_Stroker stroker = NULL;
|
|
|
802 |
|
|
|
803 |
|
|
|
804 |
if ( !library )
|
|
|
805 |
return FT_THROW( Invalid_Library_Handle );
|
|
|
806 |
|
|
|
807 |
if ( !astroker )
|
|
|
808 |
return FT_THROW( Invalid_Argument );
|
|
|
809 |
|
|
|
810 |
memory = library->memory;
|
|
|
811 |
|
|
|
812 |
if ( !FT_NEW( stroker ) )
|
|
|
813 |
{
|
|
|
814 |
stroker->library = library;
|
|
|
815 |
|
|
|
816 |
ft_stroke_border_init( &stroker->borders[0], memory );
|
|
|
817 |
ft_stroke_border_init( &stroker->borders[1], memory );
|
|
|
818 |
}
|
|
|
819 |
|
|
|
820 |
*astroker = stroker;
|
|
|
821 |
|
|
|
822 |
return error;
|
|
|
823 |
}
|
|
|
824 |
|
|
|
825 |
|
|
|
826 |
/* documentation is in ftstroke.h */
|
|
|
827 |
|
|
|
828 |
FT_EXPORT_DEF( void )
|
|
|
829 |
FT_Stroker_Set( FT_Stroker stroker,
|
|
|
830 |
FT_Fixed radius,
|
|
|
831 |
FT_Stroker_LineCap line_cap,
|
|
|
832 |
FT_Stroker_LineJoin line_join,
|
|
|
833 |
FT_Fixed miter_limit )
|
|
|
834 |
{
|
|
|
835 |
if ( !stroker )
|
|
|
836 |
return;
|
|
|
837 |
|
|
|
838 |
stroker->radius = radius;
|
|
|
839 |
stroker->line_cap = line_cap;
|
|
|
840 |
stroker->line_join = line_join;
|
|
|
841 |
stroker->miter_limit = miter_limit;
|
|
|
842 |
|
|
|
843 |
/* ensure miter limit has sensible value */
|
|
|
844 |
if ( stroker->miter_limit < 0x10000L )
|
|
|
845 |
stroker->miter_limit = 0x10000L;
|
|
|
846 |
|
|
|
847 |
/* save line join style: */
|
|
|
848 |
/* line join style can be temporarily changed when stroking curves */
|
|
|
849 |
stroker->line_join_saved = line_join;
|
|
|
850 |
|
|
|
851 |
FT_Stroker_Rewind( stroker );
|
|
|
852 |
}
|
|
|
853 |
|
|
|
854 |
|
|
|
855 |
/* documentation is in ftstroke.h */
|
|
|
856 |
|
|
|
857 |
FT_EXPORT_DEF( void )
|
|
|
858 |
FT_Stroker_Rewind( FT_Stroker stroker )
|
|
|
859 |
{
|
|
|
860 |
if ( stroker )
|
|
|
861 |
{
|
|
|
862 |
ft_stroke_border_reset( &stroker->borders[0] );
|
|
|
863 |
ft_stroke_border_reset( &stroker->borders[1] );
|
|
|
864 |
}
|
|
|
865 |
}
|
|
|
866 |
|
|
|
867 |
|
|
|
868 |
/* documentation is in ftstroke.h */
|
|
|
869 |
|
|
|
870 |
FT_EXPORT_DEF( void )
|
|
|
871 |
FT_Stroker_Done( FT_Stroker stroker )
|
|
|
872 |
{
|
|
|
873 |
if ( stroker )
|
|
|
874 |
{
|
|
|
875 |
FT_Memory memory = stroker->library->memory;
|
|
|
876 |
|
|
|
877 |
|
|
|
878 |
ft_stroke_border_done( &stroker->borders[0] );
|
|
|
879 |
ft_stroke_border_done( &stroker->borders[1] );
|
|
|
880 |
|
|
|
881 |
stroker->library = NULL;
|
|
|
882 |
FT_FREE( stroker );
|
|
|
883 |
}
|
|
|
884 |
}
|
|
|
885 |
|
|
|
886 |
|
|
|
887 |
/* create a circular arc at a corner or cap */
|
|
|
888 |
static FT_Error
|
|
|
889 |
ft_stroker_arcto( FT_Stroker stroker,
|
|
|
890 |
FT_Int side )
|
|
|
891 |
{
|
|
|
892 |
FT_Angle total, rotate;
|
|
|
893 |
FT_Fixed radius = stroker->radius;
|
|
|
894 |
FT_Error error = FT_Err_Ok;
|
|
|
895 |
FT_StrokeBorder border = stroker->borders + side;
|
|
|
896 |
|
|
|
897 |
|
|
|
898 |
rotate = FT_SIDE_TO_ROTATE( side );
|
|
|
899 |
|
|
|
900 |
total = FT_Angle_Diff( stroker->angle_in, stroker->angle_out );
|
|
|
901 |
if ( total == FT_ANGLE_PI )
|
|
|
902 |
total = -rotate * 2;
|
|
|
903 |
|
|
|
904 |
error = ft_stroke_border_arcto( border,
|
|
|
905 |
&stroker->center,
|
|
|
906 |
radius,
|
|
|
907 |
stroker->angle_in + rotate,
|
|
|
908 |
total );
|
|
|
909 |
border->movable = FALSE;
|
|
|
910 |
return error;
|
|
|
911 |
}
|
|
|
912 |
|
|
|
913 |
|
|
|
914 |
/* add a cap at the end of an opened path */
|
|
|
915 |
static FT_Error
|
|
|
916 |
ft_stroker_cap( FT_Stroker stroker,
|
|
|
917 |
FT_Angle angle,
|
|
|
918 |
FT_Int side )
|
|
|
919 |
{
|
|
|
920 |
FT_Error error = FT_Err_Ok;
|
|
|
921 |
|
|
|
922 |
|
|
|
923 |
if ( stroker->line_cap == FT_STROKER_LINECAP_ROUND )
|
|
|
924 |
{
|
|
|
925 |
/* add a round cap */
|
|
|
926 |
stroker->angle_in = angle;
|
|
|
927 |
stroker->angle_out = angle + FT_ANGLE_PI;
|
|
|
928 |
|
|
|
929 |
error = ft_stroker_arcto( stroker, side );
|
|
|
930 |
}
|
|
|
931 |
else if ( stroker->line_cap == FT_STROKER_LINECAP_SQUARE )
|
|
|
932 |
{
|
|
|
933 |
/* add a square cap */
|
|
|
934 |
FT_Vector delta, delta2;
|
|
|
935 |
FT_Angle rotate = FT_SIDE_TO_ROTATE( side );
|
|
|
936 |
FT_Fixed radius = stroker->radius;
|
|
|
937 |
FT_StrokeBorder border = stroker->borders + side;
|
|
|
938 |
|
|
|
939 |
|
|
|
940 |
FT_Vector_From_Polar( &delta2, radius, angle + rotate );
|
|
|
941 |
FT_Vector_From_Polar( &delta, radius, angle );
|
|
|
942 |
|
|
|
943 |
delta.x += stroker->center.x + delta2.x;
|
|
|
944 |
delta.y += stroker->center.y + delta2.y;
|
|
|
945 |
|
|
|
946 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
947 |
if ( error )
|
|
|
948 |
goto Exit;
|
|
|
949 |
|
|
|
950 |
FT_Vector_From_Polar( &delta2, radius, angle - rotate );
|
|
|
951 |
FT_Vector_From_Polar( &delta, radius, angle );
|
|
|
952 |
|
|
|
953 |
delta.x += delta2.x + stroker->center.x;
|
|
|
954 |
delta.y += delta2.y + stroker->center.y;
|
|
|
955 |
|
|
|
956 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
957 |
}
|
|
|
958 |
else if ( stroker->line_cap == FT_STROKER_LINECAP_BUTT )
|
|
|
959 |
{
|
|
|
960 |
/* add a butt ending */
|
|
|
961 |
FT_Vector delta;
|
|
|
962 |
FT_Angle rotate = FT_SIDE_TO_ROTATE( side );
|
|
|
963 |
FT_Fixed radius = stroker->radius;
|
|
|
964 |
FT_StrokeBorder border = stroker->borders + side;
|
|
|
965 |
|
|
|
966 |
|
|
|
967 |
FT_Vector_From_Polar( &delta, radius, angle + rotate );
|
|
|
968 |
|
|
|
969 |
delta.x += stroker->center.x;
|
|
|
970 |
delta.y += stroker->center.y;
|
|
|
971 |
|
|
|
972 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
973 |
if ( error )
|
|
|
974 |
goto Exit;
|
|
|
975 |
|
|
|
976 |
FT_Vector_From_Polar( &delta, radius, angle - rotate );
|
|
|
977 |
|
|
|
978 |
delta.x += stroker->center.x;
|
|
|
979 |
delta.y += stroker->center.y;
|
|
|
980 |
|
|
|
981 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
982 |
}
|
|
|
983 |
|
|
|
984 |
Exit:
|
|
|
985 |
return error;
|
|
|
986 |
}
|
|
|
987 |
|
|
|
988 |
|
|
|
989 |
/* process an inside corner, i.e. compute intersection */
|
|
|
990 |
static FT_Error
|
|
|
991 |
ft_stroker_inside( FT_Stroker stroker,
|
|
|
992 |
FT_Int side,
|
|
|
993 |
FT_Fixed line_length )
|
|
|
994 |
{
|
|
|
995 |
FT_StrokeBorder border = stroker->borders + side;
|
|
|
996 |
FT_Angle phi, theta, rotate;
|
|
|
997 |
FT_Fixed length, thcos;
|
|
|
998 |
FT_Vector delta;
|
|
|
999 |
FT_Error error = FT_Err_Ok;
|
|
|
1000 |
FT_Bool intersect; /* use intersection of lines? */
|
|
|
1001 |
|
|
|
1002 |
|
|
|
1003 |
rotate = FT_SIDE_TO_ROTATE( side );
|
|
|
1004 |
|
|
|
1005 |
theta = FT_Angle_Diff( stroker->angle_in, stroker->angle_out ) / 2;
|
|
|
1006 |
|
|
|
1007 |
/* Only intersect borders if between two lineto's and both */
|
|
|
1008 |
/* lines are long enough (line_length is zero for curves). */
|
|
|
1009 |
/* Also avoid U-turns of nearly 180 degree. */
|
|
|
1010 |
if ( !border->movable || line_length == 0 ||
|
|
|
1011 |
theta > 0x59C000 || theta < -0x59C000 )
|
|
|
1012 |
intersect = FALSE;
|
|
|
1013 |
else
|
|
|
1014 |
{
|
|
|
1015 |
/* compute minimum required length of lines */
|
|
|
1016 |
FT_Fixed min_length = ft_pos_abs( FT_MulFix( stroker->radius,
|
|
|
1017 |
FT_Tan( theta ) ) );
|
|
|
1018 |
|
|
|
1019 |
|
|
|
1020 |
intersect = FT_BOOL( min_length &&
|
|
|
1021 |
stroker->line_length >= min_length &&
|
|
|
1022 |
line_length >= min_length );
|
|
|
1023 |
}
|
|
|
1024 |
|
|
|
1025 |
if ( !intersect )
|
|
|
1026 |
{
|
|
|
1027 |
FT_Vector_From_Polar( &delta, stroker->radius,
|
|
|
1028 |
stroker->angle_out + rotate );
|
|
|
1029 |
delta.x += stroker->center.x;
|
|
|
1030 |
delta.y += stroker->center.y;
|
|
|
1031 |
|
|
|
1032 |
border->movable = FALSE;
|
|
|
1033 |
}
|
|
|
1034 |
else
|
|
|
1035 |
{
|
|
|
1036 |
/* compute median angle */
|
|
|
1037 |
phi = stroker->angle_in + theta;
|
|
|
1038 |
|
|
|
1039 |
thcos = FT_Cos( theta );
|
|
|
1040 |
|
|
|
1041 |
length = FT_DivFix( stroker->radius, thcos );
|
|
|
1042 |
|
|
|
1043 |
FT_Vector_From_Polar( &delta, length, phi + rotate );
|
|
|
1044 |
delta.x += stroker->center.x;
|
|
|
1045 |
delta.y += stroker->center.y;
|
|
|
1046 |
}
|
|
|
1047 |
|
|
|
1048 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
1049 |
|
|
|
1050 |
return error;
|
|
|
1051 |
}
|
|
|
1052 |
|
|
|
1053 |
|
|
|
1054 |
/* process an outside corner, i.e. compute bevel/miter/round */
|
|
|
1055 |
static FT_Error
|
|
|
1056 |
ft_stroker_outside( FT_Stroker stroker,
|
|
|
1057 |
FT_Int side,
|
|
|
1058 |
FT_Fixed line_length )
|
|
|
1059 |
{
|
|
|
1060 |
FT_StrokeBorder border = stroker->borders + side;
|
|
|
1061 |
FT_Error error;
|
|
|
1062 |
FT_Angle rotate;
|
|
|
1063 |
|
|
|
1064 |
|
|
|
1065 |
if ( stroker->line_join == FT_STROKER_LINEJOIN_ROUND )
|
|
|
1066 |
error = ft_stroker_arcto( stroker, side );
|
|
|
1067 |
else
|
|
|
1068 |
{
|
|
|
1069 |
/* this is a mitered (pointed) or beveled (truncated) corner */
|
|
|
1070 |
FT_Fixed sigma = 0, radius = stroker->radius;
|
|
|
1071 |
FT_Angle theta = 0, phi = 0;
|
|
|
1072 |
FT_Fixed thcos = 0;
|
|
|
1073 |
FT_Bool bevel, fixed_bevel;
|
|
|
1074 |
|
|
|
1075 |
|
|
|
1076 |
rotate = FT_SIDE_TO_ROTATE( side );
|
|
|
1077 |
|
|
|
1078 |
bevel =
|
|
|
1079 |
FT_BOOL( stroker->line_join == FT_STROKER_LINEJOIN_BEVEL );
|
|
|
1080 |
|
|
|
1081 |
fixed_bevel =
|
|
|
1082 |
FT_BOOL( stroker->line_join != FT_STROKER_LINEJOIN_MITER_VARIABLE );
|
|
|
1083 |
|
|
|
1084 |
if ( !bevel )
|
|
|
1085 |
{
|
|
|
1086 |
theta = FT_Angle_Diff( stroker->angle_in, stroker->angle_out );
|
|
|
1087 |
|
|
|
1088 |
if ( theta == FT_ANGLE_PI )
|
|
|
1089 |
{
|
|
|
1090 |
theta = rotate;
|
|
|
1091 |
phi = stroker->angle_in;
|
|
|
1092 |
}
|
|
|
1093 |
else
|
|
|
1094 |
{
|
|
|
1095 |
theta /= 2;
|
|
|
1096 |
phi = stroker->angle_in + theta + rotate;
|
|
|
1097 |
}
|
|
|
1098 |
|
|
|
1099 |
thcos = FT_Cos( theta );
|
|
|
1100 |
sigma = FT_MulFix( stroker->miter_limit, thcos );
|
|
|
1101 |
|
|
|
1102 |
/* is miter limit exceeded? */
|
|
|
1103 |
if ( sigma < 0x10000L )
|
|
|
1104 |
{
|
|
|
1105 |
/* don't create variable bevels for very small deviations; */
|
|
|
1106 |
/* FT_Sin(x) = 0 for x <= 57 */
|
|
|
1107 |
if ( fixed_bevel || ft_pos_abs( theta ) > 57 )
|
|
|
1108 |
bevel = TRUE;
|
|
|
1109 |
}
|
|
|
1110 |
}
|
|
|
1111 |
|
|
|
1112 |
if ( bevel ) /* this is a bevel (broken angle) */
|
|
|
1113 |
{
|
|
|
1114 |
if ( fixed_bevel )
|
|
|
1115 |
{
|
|
|
1116 |
/* the outer corners are simply joined together */
|
|
|
1117 |
FT_Vector delta;
|
|
|
1118 |
|
|
|
1119 |
|
|
|
1120 |
/* add bevel */
|
|
|
1121 |
FT_Vector_From_Polar( &delta,
|
|
|
1122 |
radius,
|
|
|
1123 |
stroker->angle_out + rotate );
|
|
|
1124 |
delta.x += stroker->center.x;
|
|
|
1125 |
delta.y += stroker->center.y;
|
|
|
1126 |
|
|
|
1127 |
border->movable = FALSE;
|
|
|
1128 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
1129 |
}
|
|
|
1130 |
else /* variable bevel */
|
|
|
1131 |
{
|
|
|
1132 |
/* the miter is truncated */
|
|
|
1133 |
FT_Vector middle, delta;
|
|
|
1134 |
FT_Fixed length;
|
|
|
1135 |
|
|
|
1136 |
|
|
|
1137 |
/* compute middle point */
|
|
|
1138 |
FT_Vector_From_Polar( &middle,
|
|
|
1139 |
FT_MulFix( radius, stroker->miter_limit ),
|
|
|
1140 |
phi );
|
|
|
1141 |
middle.x += stroker->center.x;
|
|
|
1142 |
middle.y += stroker->center.y;
|
|
|
1143 |
|
|
|
1144 |
/* compute first angle point */
|
|
|
1145 |
length = FT_MulDiv( radius, 0x10000L - sigma,
|
|
|
1146 |
ft_pos_abs( FT_Sin( theta ) ) );
|
|
|
1147 |
|
|
|
1148 |
FT_Vector_From_Polar( &delta, length, phi + rotate );
|
|
|
1149 |
delta.x += middle.x;
|
|
|
1150 |
delta.y += middle.y;
|
|
|
1151 |
|
|
|
1152 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
1153 |
if ( error )
|
|
|
1154 |
goto Exit;
|
|
|
1155 |
|
|
|
1156 |
/* compute second angle point */
|
|
|
1157 |
FT_Vector_From_Polar( &delta, length, phi - rotate );
|
|
|
1158 |
delta.x += middle.x;
|
|
|
1159 |
delta.y += middle.y;
|
|
|
1160 |
|
|
|
1161 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
1162 |
if ( error )
|
|
|
1163 |
goto Exit;
|
|
|
1164 |
|
|
|
1165 |
/* finally, add an end point; only needed if not lineto */
|
|
|
1166 |
/* (line_length is zero for curves) */
|
|
|
1167 |
if ( line_length == 0 )
|
|
|
1168 |
{
|
|
|
1169 |
FT_Vector_From_Polar( &delta,
|
|
|
1170 |
radius,
|
|
|
1171 |
stroker->angle_out + rotate );
|
|
|
1172 |
|
|
|
1173 |
delta.x += stroker->center.x;
|
|
|
1174 |
delta.y += stroker->center.y;
|
|
|
1175 |
|
|
|
1176 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
1177 |
}
|
|
|
1178 |
}
|
|
|
1179 |
}
|
|
|
1180 |
else /* this is a miter (intersection) */
|
|
|
1181 |
{
|
|
|
1182 |
FT_Fixed length;
|
|
|
1183 |
FT_Vector delta;
|
|
|
1184 |
|
|
|
1185 |
|
|
|
1186 |
length = FT_DivFix( stroker->radius, thcos );
|
|
|
1187 |
|
|
|
1188 |
FT_Vector_From_Polar( &delta, length, phi );
|
|
|
1189 |
delta.x += stroker->center.x;
|
|
|
1190 |
delta.y += stroker->center.y;
|
|
|
1191 |
|
|
|
1192 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
1193 |
if ( error )
|
|
|
1194 |
goto Exit;
|
|
|
1195 |
|
|
|
1196 |
/* now add an end point; only needed if not lineto */
|
|
|
1197 |
/* (line_length is zero for curves) */
|
|
|
1198 |
if ( line_length == 0 )
|
|
|
1199 |
{
|
|
|
1200 |
FT_Vector_From_Polar( &delta,
|
|
|
1201 |
stroker->radius,
|
|
|
1202 |
stroker->angle_out + rotate );
|
|
|
1203 |
delta.x += stroker->center.x;
|
|
|
1204 |
delta.y += stroker->center.y;
|
|
|
1205 |
|
|
|
1206 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
1207 |
}
|
|
|
1208 |
}
|
|
|
1209 |
}
|
|
|
1210 |
|
|
|
1211 |
Exit:
|
|
|
1212 |
return error;
|
|
|
1213 |
}
|
|
|
1214 |
|
|
|
1215 |
|
|
|
1216 |
static FT_Error
|
|
|
1217 |
ft_stroker_process_corner( FT_Stroker stroker,
|
|
|
1218 |
FT_Fixed line_length )
|
|
|
1219 |
{
|
|
|
1220 |
FT_Error error = FT_Err_Ok;
|
|
|
1221 |
FT_Angle turn;
|
|
|
1222 |
FT_Int inside_side;
|
|
|
1223 |
|
|
|
1224 |
|
|
|
1225 |
turn = FT_Angle_Diff( stroker->angle_in, stroker->angle_out );
|
|
|
1226 |
|
|
|
1227 |
/* no specific corner processing is required if the turn is 0 */
|
|
|
1228 |
if ( turn == 0 )
|
|
|
1229 |
goto Exit;
|
|
|
1230 |
|
|
|
1231 |
/* when we turn to the right, the inside side is 0 */
|
|
|
1232 |
/* otherwise, the inside side is 1 */
|
|
|
1233 |
inside_side = ( turn < 0 );
|
|
|
1234 |
|
|
|
1235 |
/* process the inside side */
|
|
|
1236 |
error = ft_stroker_inside( stroker, inside_side, line_length );
|
|
|
1237 |
if ( error )
|
|
|
1238 |
goto Exit;
|
|
|
1239 |
|
|
|
1240 |
/* process the outside side */
|
|
|
1241 |
error = ft_stroker_outside( stroker, !inside_side, line_length );
|
|
|
1242 |
|
|
|
1243 |
Exit:
|
|
|
1244 |
return error;
|
|
|
1245 |
}
|
|
|
1246 |
|
|
|
1247 |
|
|
|
1248 |
/* add two points to the left and right borders corresponding to the */
|
|
|
1249 |
/* start of the subpath */
|
|
|
1250 |
static FT_Error
|
|
|
1251 |
ft_stroker_subpath_start( FT_Stroker stroker,
|
|
|
1252 |
FT_Angle start_angle,
|
|
|
1253 |
FT_Fixed line_length )
|
|
|
1254 |
{
|
|
|
1255 |
FT_Vector delta;
|
|
|
1256 |
FT_Vector point;
|
|
|
1257 |
FT_Error error;
|
|
|
1258 |
FT_StrokeBorder border;
|
|
|
1259 |
|
|
|
1260 |
|
|
|
1261 |
FT_Vector_From_Polar( &delta, stroker->radius,
|
|
|
1262 |
start_angle + FT_ANGLE_PI2 );
|
|
|
1263 |
|
|
|
1264 |
point.x = stroker->center.x + delta.x;
|
|
|
1265 |
point.y = stroker->center.y + delta.y;
|
|
|
1266 |
|
|
|
1267 |
border = stroker->borders;
|
|
|
1268 |
error = ft_stroke_border_moveto( border, &point );
|
|
|
1269 |
if ( error )
|
|
|
1270 |
goto Exit;
|
|
|
1271 |
|
|
|
1272 |
point.x = stroker->center.x - delta.x;
|
|
|
1273 |
point.y = stroker->center.y - delta.y;
|
|
|
1274 |
|
|
|
1275 |
border++;
|
|
|
1276 |
error = ft_stroke_border_moveto( border, &point );
|
|
|
1277 |
|
|
|
1278 |
/* save angle, position, and line length for last join */
|
|
|
1279 |
/* (line_length is zero for curves) */
|
|
|
1280 |
stroker->subpath_angle = start_angle;
|
|
|
1281 |
stroker->first_point = FALSE;
|
|
|
1282 |
stroker->subpath_line_length = line_length;
|
|
|
1283 |
|
|
|
1284 |
Exit:
|
|
|
1285 |
return error;
|
|
|
1286 |
}
|
|
|
1287 |
|
|
|
1288 |
|
|
|
1289 |
/* documentation is in ftstroke.h */
|
|
|
1290 |
|
|
|
1291 |
FT_EXPORT_DEF( FT_Error )
|
|
|
1292 |
FT_Stroker_LineTo( FT_Stroker stroker,
|
|
|
1293 |
FT_Vector* to )
|
|
|
1294 |
{
|
|
|
1295 |
FT_Error error = FT_Err_Ok;
|
|
|
1296 |
FT_StrokeBorder border;
|
|
|
1297 |
FT_Vector delta;
|
|
|
1298 |
FT_Angle angle;
|
|
|
1299 |
FT_Int side;
|
|
|
1300 |
FT_Fixed line_length;
|
|
|
1301 |
|
|
|
1302 |
|
|
|
1303 |
if ( !stroker || !to )
|
|
|
1304 |
return FT_THROW( Invalid_Argument );
|
|
|
1305 |
|
|
|
1306 |
delta.x = to->x - stroker->center.x;
|
|
|
1307 |
delta.y = to->y - stroker->center.y;
|
|
|
1308 |
|
|
|
1309 |
/* a zero-length lineto is a no-op; avoid creating a spurious corner */
|
|
|
1310 |
if ( delta.x == 0 && delta.y == 0 )
|
|
|
1311 |
goto Exit;
|
|
|
1312 |
|
|
|
1313 |
/* compute length of line */
|
|
|
1314 |
line_length = FT_Vector_Length( &delta );
|
|
|
1315 |
|
|
|
1316 |
angle = FT_Atan2( delta.x, delta.y );
|
|
|
1317 |
FT_Vector_From_Polar( &delta, stroker->radius, angle + FT_ANGLE_PI2 );
|
|
|
1318 |
|
|
|
1319 |
/* process corner if necessary */
|
|
|
1320 |
if ( stroker->first_point )
|
|
|
1321 |
{
|
|
|
1322 |
/* This is the first segment of a subpath. We need to */
|
|
|
1323 |
/* add a point to each border at their respective starting */
|
|
|
1324 |
/* point locations. */
|
|
|
1325 |
error = ft_stroker_subpath_start( stroker, angle, line_length );
|
|
|
1326 |
if ( error )
|
|
|
1327 |
goto Exit;
|
|
|
1328 |
}
|
|
|
1329 |
else
|
|
|
1330 |
{
|
|
|
1331 |
/* process the current corner */
|
|
|
1332 |
stroker->angle_out = angle;
|
|
|
1333 |
error = ft_stroker_process_corner( stroker, line_length );
|
|
|
1334 |
if ( error )
|
|
|
1335 |
goto Exit;
|
|
|
1336 |
}
|
|
|
1337 |
|
|
|
1338 |
/* now add a line segment to both the `inside' and `outside' paths */
|
|
|
1339 |
for ( border = stroker->borders, side = 1; side >= 0; side--, border++ )
|
|
|
1340 |
{
|
|
|
1341 |
FT_Vector point;
|
|
|
1342 |
|
|
|
1343 |
|
|
|
1344 |
point.x = to->x + delta.x;
|
|
|
1345 |
point.y = to->y + delta.y;
|
|
|
1346 |
|
|
|
1347 |
/* the ends of lineto borders are movable */
|
|
|
1348 |
error = ft_stroke_border_lineto( border, &point, TRUE );
|
|
|
1349 |
if ( error )
|
|
|
1350 |
goto Exit;
|
|
|
1351 |
|
|
|
1352 |
delta.x = -delta.x;
|
|
|
1353 |
delta.y = -delta.y;
|
|
|
1354 |
}
|
|
|
1355 |
|
|
|
1356 |
stroker->angle_in = angle;
|
|
|
1357 |
stroker->center = *to;
|
|
|
1358 |
stroker->line_length = line_length;
|
|
|
1359 |
|
|
|
1360 |
Exit:
|
|
|
1361 |
return error;
|
|
|
1362 |
}
|
|
|
1363 |
|
|
|
1364 |
|
|
|
1365 |
/* documentation is in ftstroke.h */
|
|
|
1366 |
|
|
|
1367 |
FT_EXPORT_DEF( FT_Error )
|
|
|
1368 |
FT_Stroker_ConicTo( FT_Stroker stroker,
|
|
|
1369 |
FT_Vector* control,
|
|
|
1370 |
FT_Vector* to )
|
|
|
1371 |
{
|
|
|
1372 |
FT_Error error = FT_Err_Ok;
|
|
|
1373 |
FT_Vector bez_stack[34];
|
|
|
1374 |
FT_Vector* arc;
|
|
|
1375 |
FT_Vector* limit = bez_stack + 30;
|
|
|
1376 |
FT_Bool first_arc = TRUE;
|
|
|
1377 |
|
|
|
1378 |
|
|
|
1379 |
if ( !stroker || !control || !to )
|
|
|
1380 |
{
|
|
|
1381 |
error = FT_THROW( Invalid_Argument );
|
|
|
1382 |
goto Exit;
|
|
|
1383 |
}
|
|
|
1384 |
|
|
|
1385 |
/* if all control points are coincident, this is a no-op; */
|
|
|
1386 |
/* avoid creating a spurious corner */
|
|
|
1387 |
if ( FT_IS_SMALL( stroker->center.x - control->x ) &&
|
|
|
1388 |
FT_IS_SMALL( stroker->center.y - control->y ) &&
|
|
|
1389 |
FT_IS_SMALL( control->x - to->x ) &&
|
|
|
1390 |
FT_IS_SMALL( control->y - to->y ) )
|
|
|
1391 |
{
|
|
|
1392 |
stroker->center = *to;
|
|
|
1393 |
goto Exit;
|
|
|
1394 |
}
|
|
|
1395 |
|
|
|
1396 |
arc = bez_stack;
|
|
|
1397 |
arc[0] = *to;
|
|
|
1398 |
arc[1] = *control;
|
|
|
1399 |
arc[2] = stroker->center;
|
|
|
1400 |
|
|
|
1401 |
while ( arc >= bez_stack )
|
|
|
1402 |
{
|
|
|
1403 |
FT_Angle angle_in, angle_out;
|
|
|
1404 |
|
|
|
1405 |
|
|
|
1406 |
/* initialize with current direction */
|
|
|
1407 |
angle_in = angle_out = stroker->angle_in;
|
|
|
1408 |
|
|
|
1409 |
if ( arc < limit &&
|
|
|
1410 |
!ft_conic_is_small_enough( arc, &angle_in, &angle_out ) )
|
|
|
1411 |
{
|
|
|
1412 |
if ( stroker->first_point )
|
|
|
1413 |
stroker->angle_in = angle_in;
|
|
|
1414 |
|
|
|
1415 |
ft_conic_split( arc );
|
|
|
1416 |
arc += 2;
|
|
|
1417 |
continue;
|
|
|
1418 |
}
|
|
|
1419 |
|
|
|
1420 |
if ( first_arc )
|
|
|
1421 |
{
|
|
|
1422 |
first_arc = FALSE;
|
|
|
1423 |
|
|
|
1424 |
/* process corner if necessary */
|
|
|
1425 |
if ( stroker->first_point )
|
|
|
1426 |
error = ft_stroker_subpath_start( stroker, angle_in, 0 );
|
|
|
1427 |
else
|
|
|
1428 |
{
|
|
|
1429 |
stroker->angle_out = angle_in;
|
|
|
1430 |
error = ft_stroker_process_corner( stroker, 0 );
|
|
|
1431 |
}
|
|
|
1432 |
}
|
|
|
1433 |
else if ( ft_pos_abs( FT_Angle_Diff( stroker->angle_in, angle_in ) ) >
|
|
|
1434 |
FT_SMALL_CONIC_THRESHOLD / 4 )
|
|
|
1435 |
{
|
|
|
1436 |
/* if the deviation from one arc to the next is too great, */
|
|
|
1437 |
/* add a round corner */
|
|
|
1438 |
stroker->center = arc[2];
|
|
|
1439 |
stroker->angle_out = angle_in;
|
|
|
1440 |
stroker->line_join = FT_STROKER_LINEJOIN_ROUND;
|
|
|
1441 |
|
|
|
1442 |
error = ft_stroker_process_corner( stroker, 0 );
|
|
|
1443 |
|
|
|
1444 |
/* reinstate line join style */
|
|
|
1445 |
stroker->line_join = stroker->line_join_saved;
|
|
|
1446 |
}
|
|
|
1447 |
|
|
|
1448 |
if ( error )
|
|
|
1449 |
goto Exit;
|
|
|
1450 |
|
|
|
1451 |
/* the arc's angle is small enough; we can add it directly to each */
|
|
|
1452 |
/* border */
|
|
|
1453 |
{
|
|
|
1454 |
FT_Vector ctrl, end;
|
|
|
1455 |
FT_Angle theta, phi, rotate, alpha0 = 0;
|
|
|
1456 |
FT_Fixed length;
|
|
|
1457 |
FT_StrokeBorder border;
|
|
|
1458 |
FT_Int side;
|
|
|
1459 |
|
|
|
1460 |
|
|
|
1461 |
theta = FT_Angle_Diff( angle_in, angle_out ) / 2;
|
|
|
1462 |
phi = angle_in + theta;
|
|
|
1463 |
length = FT_DivFix( stroker->radius, FT_Cos( theta ) );
|
|
|
1464 |
|
|
|
1465 |
/* compute direction of original arc */
|
|
|
1466 |
if ( stroker->handle_wide_strokes )
|
|
|
1467 |
alpha0 = FT_Atan2( arc[0].x - arc[2].x, arc[0].y - arc[2].y );
|
|
|
1468 |
|
|
|
1469 |
for ( border = stroker->borders, side = 0;
|
|
|
1470 |
side <= 1;
|
|
|
1471 |
side++, border++ )
|
|
|
1472 |
{
|
|
|
1473 |
rotate = FT_SIDE_TO_ROTATE( side );
|
|
|
1474 |
|
|
|
1475 |
/* compute control point */
|
|
|
1476 |
FT_Vector_From_Polar( &ctrl, length, phi + rotate );
|
|
|
1477 |
ctrl.x += arc[1].x;
|
|
|
1478 |
ctrl.y += arc[1].y;
|
|
|
1479 |
|
|
|
1480 |
/* compute end point */
|
|
|
1481 |
FT_Vector_From_Polar( &end, stroker->radius, angle_out + rotate );
|
|
|
1482 |
end.x += arc[0].x;
|
|
|
1483 |
end.y += arc[0].y;
|
|
|
1484 |
|
|
|
1485 |
if ( stroker->handle_wide_strokes )
|
|
|
1486 |
{
|
|
|
1487 |
FT_Vector start;
|
|
|
1488 |
FT_Angle alpha1;
|
|
|
1489 |
|
|
|
1490 |
|
|
|
1491 |
/* determine whether the border radius is greater than the */
|
|
|
1492 |
/* radius of curvature of the original arc */
|
|
|
1493 |
start = border->points[border->num_points - 1];
|
|
|
1494 |
|
|
|
1495 |
alpha1 = FT_Atan2( end.x - start.x, end.y - start.y );
|
|
|
1496 |
|
|
|
1497 |
/* is the direction of the border arc opposite to */
|
|
|
1498 |
/* that of the original arc? */
|
|
|
1499 |
if ( ft_pos_abs( FT_Angle_Diff( alpha0, alpha1 ) ) >
|
|
|
1500 |
FT_ANGLE_PI / 2 )
|
|
|
1501 |
{
|
|
|
1502 |
FT_Angle beta, gamma;
|
|
|
1503 |
FT_Vector bvec, delta;
|
|
|
1504 |
FT_Fixed blen, sinA, sinB, alen;
|
|
|
1505 |
|
|
|
1506 |
|
|
|
1507 |
/* use the sine rule to find the intersection point */
|
|
|
1508 |
beta = FT_Atan2( arc[2].x - start.x, arc[2].y - start.y );
|
|
|
1509 |
gamma = FT_Atan2( arc[0].x - end.x, arc[0].y - end.y );
|
|
|
1510 |
|
|
|
1511 |
bvec.x = end.x - start.x;
|
|
|
1512 |
bvec.y = end.y - start.y;
|
|
|
1513 |
|
|
|
1514 |
blen = FT_Vector_Length( &bvec );
|
|
|
1515 |
|
|
|
1516 |
sinA = ft_pos_abs( FT_Sin( alpha1 - gamma ) );
|
|
|
1517 |
sinB = ft_pos_abs( FT_Sin( beta - gamma ) );
|
|
|
1518 |
|
|
|
1519 |
alen = FT_MulDiv( blen, sinA, sinB );
|
|
|
1520 |
|
|
|
1521 |
FT_Vector_From_Polar( &delta, alen, beta );
|
|
|
1522 |
delta.x += start.x;
|
|
|
1523 |
delta.y += start.y;
|
|
|
1524 |
|
|
|
1525 |
/* circumnavigate the negative sector backwards */
|
|
|
1526 |
border->movable = FALSE;
|
|
|
1527 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
1528 |
if ( error )
|
|
|
1529 |
goto Exit;
|
|
|
1530 |
error = ft_stroke_border_lineto( border, &end, FALSE );
|
|
|
1531 |
if ( error )
|
|
|
1532 |
goto Exit;
|
|
|
1533 |
error = ft_stroke_border_conicto( border, &ctrl, &start );
|
|
|
1534 |
if ( error )
|
|
|
1535 |
goto Exit;
|
|
|
1536 |
/* and then move to the endpoint */
|
|
|
1537 |
error = ft_stroke_border_lineto( border, &end, FALSE );
|
|
|
1538 |
if ( error )
|
|
|
1539 |
goto Exit;
|
|
|
1540 |
|
|
|
1541 |
continue;
|
|
|
1542 |
}
|
|
|
1543 |
|
|
|
1544 |
/* else fall through */
|
|
|
1545 |
}
|
|
|
1546 |
|
|
|
1547 |
/* simply add an arc */
|
|
|
1548 |
error = ft_stroke_border_conicto( border, &ctrl, &end );
|
|
|
1549 |
if ( error )
|
|
|
1550 |
goto Exit;
|
|
|
1551 |
}
|
|
|
1552 |
}
|
|
|
1553 |
|
|
|
1554 |
arc -= 2;
|
|
|
1555 |
|
|
|
1556 |
stroker->angle_in = angle_out;
|
|
|
1557 |
}
|
|
|
1558 |
|
|
|
1559 |
stroker->center = *to;
|
|
|
1560 |
|
|
|
1561 |
Exit:
|
|
|
1562 |
return error;
|
|
|
1563 |
}
|
|
|
1564 |
|
|
|
1565 |
|
|
|
1566 |
/* documentation is in ftstroke.h */
|
|
|
1567 |
|
|
|
1568 |
FT_EXPORT_DEF( FT_Error )
|
|
|
1569 |
FT_Stroker_CubicTo( FT_Stroker stroker,
|
|
|
1570 |
FT_Vector* control1,
|
|
|
1571 |
FT_Vector* control2,
|
|
|
1572 |
FT_Vector* to )
|
|
|
1573 |
{
|
|
|
1574 |
FT_Error error = FT_Err_Ok;
|
|
|
1575 |
FT_Vector bez_stack[37];
|
|
|
1576 |
FT_Vector* arc;
|
|
|
1577 |
FT_Vector* limit = bez_stack + 32;
|
|
|
1578 |
FT_Bool first_arc = TRUE;
|
|
|
1579 |
|
|
|
1580 |
|
|
|
1581 |
if ( !stroker || !control1 || !control2 || !to )
|
|
|
1582 |
{
|
|
|
1583 |
error = FT_THROW( Invalid_Argument );
|
|
|
1584 |
goto Exit;
|
|
|
1585 |
}
|
|
|
1586 |
|
|
|
1587 |
/* if all control points are coincident, this is a no-op; */
|
|
|
1588 |
/* avoid creating a spurious corner */
|
|
|
1589 |
if ( FT_IS_SMALL( stroker->center.x - control1->x ) &&
|
|
|
1590 |
FT_IS_SMALL( stroker->center.y - control1->y ) &&
|
|
|
1591 |
FT_IS_SMALL( control1->x - control2->x ) &&
|
|
|
1592 |
FT_IS_SMALL( control1->y - control2->y ) &&
|
|
|
1593 |
FT_IS_SMALL( control2->x - to->x ) &&
|
|
|
1594 |
FT_IS_SMALL( control2->y - to->y ) )
|
|
|
1595 |
{
|
|
|
1596 |
stroker->center = *to;
|
|
|
1597 |
goto Exit;
|
|
|
1598 |
}
|
|
|
1599 |
|
|
|
1600 |
arc = bez_stack;
|
|
|
1601 |
arc[0] = *to;
|
|
|
1602 |
arc[1] = *control2;
|
|
|
1603 |
arc[2] = *control1;
|
|
|
1604 |
arc[3] = stroker->center;
|
|
|
1605 |
|
|
|
1606 |
while ( arc >= bez_stack )
|
|
|
1607 |
{
|
|
|
1608 |
FT_Angle angle_in, angle_mid, angle_out;
|
|
|
1609 |
|
|
|
1610 |
|
|
|
1611 |
/* initialize with current direction */
|
|
|
1612 |
angle_in = angle_out = angle_mid = stroker->angle_in;
|
|
|
1613 |
|
|
|
1614 |
if ( arc < limit &&
|
|
|
1615 |
!ft_cubic_is_small_enough( arc, &angle_in,
|
|
|
1616 |
&angle_mid, &angle_out ) )
|
|
|
1617 |
{
|
|
|
1618 |
if ( stroker->first_point )
|
|
|
1619 |
stroker->angle_in = angle_in;
|
|
|
1620 |
|
|
|
1621 |
ft_cubic_split( arc );
|
|
|
1622 |
arc += 3;
|
|
|
1623 |
continue;
|
|
|
1624 |
}
|
|
|
1625 |
|
|
|
1626 |
if ( first_arc )
|
|
|
1627 |
{
|
|
|
1628 |
first_arc = FALSE;
|
|
|
1629 |
|
|
|
1630 |
/* process corner if necessary */
|
|
|
1631 |
if ( stroker->first_point )
|
|
|
1632 |
error = ft_stroker_subpath_start( stroker, angle_in, 0 );
|
|
|
1633 |
else
|
|
|
1634 |
{
|
|
|
1635 |
stroker->angle_out = angle_in;
|
|
|
1636 |
error = ft_stroker_process_corner( stroker, 0 );
|
|
|
1637 |
}
|
|
|
1638 |
}
|
|
|
1639 |
else if ( ft_pos_abs( FT_Angle_Diff( stroker->angle_in, angle_in ) ) >
|
|
|
1640 |
FT_SMALL_CUBIC_THRESHOLD / 4 )
|
|
|
1641 |
{
|
|
|
1642 |
/* if the deviation from one arc to the next is too great, */
|
|
|
1643 |
/* add a round corner */
|
|
|
1644 |
stroker->center = arc[3];
|
|
|
1645 |
stroker->angle_out = angle_in;
|
|
|
1646 |
stroker->line_join = FT_STROKER_LINEJOIN_ROUND;
|
|
|
1647 |
|
|
|
1648 |
error = ft_stroker_process_corner( stroker, 0 );
|
|
|
1649 |
|
|
|
1650 |
/* reinstate line join style */
|
|
|
1651 |
stroker->line_join = stroker->line_join_saved;
|
|
|
1652 |
}
|
|
|
1653 |
|
|
|
1654 |
if ( error )
|
|
|
1655 |
goto Exit;
|
|
|
1656 |
|
|
|
1657 |
/* the arc's angle is small enough; we can add it directly to each */
|
|
|
1658 |
/* border */
|
|
|
1659 |
{
|
|
|
1660 |
FT_Vector ctrl1, ctrl2, end;
|
|
|
1661 |
FT_Angle theta1, phi1, theta2, phi2, rotate, alpha0 = 0;
|
|
|
1662 |
FT_Fixed length1, length2;
|
|
|
1663 |
FT_StrokeBorder border;
|
|
|
1664 |
FT_Int side;
|
|
|
1665 |
|
|
|
1666 |
|
|
|
1667 |
theta1 = FT_Angle_Diff( angle_in, angle_mid ) / 2;
|
|
|
1668 |
theta2 = FT_Angle_Diff( angle_mid, angle_out ) / 2;
|
|
|
1669 |
phi1 = ft_angle_mean( angle_in, angle_mid );
|
|
|
1670 |
phi2 = ft_angle_mean( angle_mid, angle_out );
|
|
|
1671 |
length1 = FT_DivFix( stroker->radius, FT_Cos( theta1 ) );
|
|
|
1672 |
length2 = FT_DivFix( stroker->radius, FT_Cos( theta2 ) );
|
|
|
1673 |
|
|
|
1674 |
/* compute direction of original arc */
|
|
|
1675 |
if ( stroker->handle_wide_strokes )
|
|
|
1676 |
alpha0 = FT_Atan2( arc[0].x - arc[3].x, arc[0].y - arc[3].y );
|
|
|
1677 |
|
|
|
1678 |
for ( border = stroker->borders, side = 0;
|
|
|
1679 |
side <= 1;
|
|
|
1680 |
side++, border++ )
|
|
|
1681 |
{
|
|
|
1682 |
rotate = FT_SIDE_TO_ROTATE( side );
|
|
|
1683 |
|
|
|
1684 |
/* compute control points */
|
|
|
1685 |
FT_Vector_From_Polar( &ctrl1, length1, phi1 + rotate );
|
|
|
1686 |
ctrl1.x += arc[2].x;
|
|
|
1687 |
ctrl1.y += arc[2].y;
|
|
|
1688 |
|
|
|
1689 |
FT_Vector_From_Polar( &ctrl2, length2, phi2 + rotate );
|
|
|
1690 |
ctrl2.x += arc[1].x;
|
|
|
1691 |
ctrl2.y += arc[1].y;
|
|
|
1692 |
|
|
|
1693 |
/* compute end point */
|
|
|
1694 |
FT_Vector_From_Polar( &end, stroker->radius, angle_out + rotate );
|
|
|
1695 |
end.x += arc[0].x;
|
|
|
1696 |
end.y += arc[0].y;
|
|
|
1697 |
|
|
|
1698 |
if ( stroker->handle_wide_strokes )
|
|
|
1699 |
{
|
|
|
1700 |
FT_Vector start;
|
|
|
1701 |
FT_Angle alpha1;
|
|
|
1702 |
|
|
|
1703 |
|
|
|
1704 |
/* determine whether the border radius is greater than the */
|
|
|
1705 |
/* radius of curvature of the original arc */
|
|
|
1706 |
start = border->points[border->num_points - 1];
|
|
|
1707 |
|
|
|
1708 |
alpha1 = FT_Atan2( end.x - start.x, end.y - start.y );
|
|
|
1709 |
|
|
|
1710 |
/* is the direction of the border arc opposite to */
|
|
|
1711 |
/* that of the original arc? */
|
|
|
1712 |
if ( ft_pos_abs( FT_Angle_Diff( alpha0, alpha1 ) ) >
|
|
|
1713 |
FT_ANGLE_PI / 2 )
|
|
|
1714 |
{
|
|
|
1715 |
FT_Angle beta, gamma;
|
|
|
1716 |
FT_Vector bvec, delta;
|
|
|
1717 |
FT_Fixed blen, sinA, sinB, alen;
|
|
|
1718 |
|
|
|
1719 |
|
|
|
1720 |
/* use the sine rule to find the intersection point */
|
|
|
1721 |
beta = FT_Atan2( arc[3].x - start.x, arc[3].y - start.y );
|
|
|
1722 |
gamma = FT_Atan2( arc[0].x - end.x, arc[0].y - end.y );
|
|
|
1723 |
|
|
|
1724 |
bvec.x = end.x - start.x;
|
|
|
1725 |
bvec.y = end.y - start.y;
|
|
|
1726 |
|
|
|
1727 |
blen = FT_Vector_Length( &bvec );
|
|
|
1728 |
|
|
|
1729 |
sinA = ft_pos_abs( FT_Sin( alpha1 - gamma ) );
|
|
|
1730 |
sinB = ft_pos_abs( FT_Sin( beta - gamma ) );
|
|
|
1731 |
|
|
|
1732 |
alen = FT_MulDiv( blen, sinA, sinB );
|
|
|
1733 |
|
|
|
1734 |
FT_Vector_From_Polar( &delta, alen, beta );
|
|
|
1735 |
delta.x += start.x;
|
|
|
1736 |
delta.y += start.y;
|
|
|
1737 |
|
|
|
1738 |
/* circumnavigate the negative sector backwards */
|
|
|
1739 |
border->movable = FALSE;
|
|
|
1740 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
1741 |
if ( error )
|
|
|
1742 |
goto Exit;
|
|
|
1743 |
error = ft_stroke_border_lineto( border, &end, FALSE );
|
|
|
1744 |
if ( error )
|
|
|
1745 |
goto Exit;
|
|
|
1746 |
error = ft_stroke_border_cubicto( border,
|
|
|
1747 |
&ctrl2,
|
|
|
1748 |
&ctrl1,
|
|
|
1749 |
&start );
|
|
|
1750 |
if ( error )
|
|
|
1751 |
goto Exit;
|
|
|
1752 |
/* and then move to the endpoint */
|
|
|
1753 |
error = ft_stroke_border_lineto( border, &end, FALSE );
|
|
|
1754 |
if ( error )
|
|
|
1755 |
goto Exit;
|
|
|
1756 |
|
|
|
1757 |
continue;
|
|
|
1758 |
}
|
|
|
1759 |
|
|
|
1760 |
/* else fall through */
|
|
|
1761 |
}
|
|
|
1762 |
|
|
|
1763 |
/* simply add an arc */
|
|
|
1764 |
error = ft_stroke_border_cubicto( border, &ctrl1, &ctrl2, &end );
|
|
|
1765 |
if ( error )
|
|
|
1766 |
goto Exit;
|
|
|
1767 |
}
|
|
|
1768 |
}
|
|
|
1769 |
|
|
|
1770 |
arc -= 3;
|
|
|
1771 |
|
|
|
1772 |
stroker->angle_in = angle_out;
|
|
|
1773 |
}
|
|
|
1774 |
|
|
|
1775 |
stroker->center = *to;
|
|
|
1776 |
|
|
|
1777 |
Exit:
|
|
|
1778 |
return error;
|
|
|
1779 |
}
|
|
|
1780 |
|
|
|
1781 |
|
|
|
1782 |
/* documentation is in ftstroke.h */
|
|
|
1783 |
|
|
|
1784 |
FT_EXPORT_DEF( FT_Error )
|
|
|
1785 |
FT_Stroker_BeginSubPath( FT_Stroker stroker,
|
|
|
1786 |
FT_Vector* to,
|
|
|
1787 |
FT_Bool open )
|
|
|
1788 |
{
|
|
|
1789 |
if ( !stroker || !to )
|
|
|
1790 |
return FT_THROW( Invalid_Argument );
|
|
|
1791 |
|
|
|
1792 |
/* We cannot process the first point, because there is not enough */
|
|
|
1793 |
/* information regarding its corner/cap. The latter will be processed */
|
|
|
1794 |
/* in the `FT_Stroker_EndSubPath' routine. */
|
|
|
1795 |
/* */
|
|
|
1796 |
stroker->first_point = TRUE;
|
|
|
1797 |
stroker->center = *to;
|
|
|
1798 |
stroker->subpath_open = open;
|
|
|
1799 |
|
|
|
1800 |
/* Determine if we need to check whether the border radius is greater */
|
|
|
1801 |
/* than the radius of curvature of a curve, to handle this case */
|
|
|
1802 |
/* specially. This is only required if bevel joins or butt caps may */
|
|
|
1803 |
/* be created, because round & miter joins and round & square caps */
|
|
|
1804 |
/* cover the negative sector created with wide strokes. */
|
|
|
1805 |
stroker->handle_wide_strokes =
|
|
|
1806 |
FT_BOOL( stroker->line_join != FT_STROKER_LINEJOIN_ROUND ||
|
|
|
1807 |
( stroker->subpath_open &&
|
|
|
1808 |
stroker->line_cap == FT_STROKER_LINECAP_BUTT ) );
|
|
|
1809 |
|
|
|
1810 |
/* record the subpath start point for each border */
|
|
|
1811 |
stroker->subpath_start = *to;
|
|
|
1812 |
|
|
|
1813 |
stroker->angle_in = 0;
|
|
|
1814 |
|
|
|
1815 |
return FT_Err_Ok;
|
|
|
1816 |
}
|
|
|
1817 |
|
|
|
1818 |
|
|
|
1819 |
static FT_Error
|
|
|
1820 |
ft_stroker_add_reverse_left( FT_Stroker stroker,
|
|
|
1821 |
FT_Bool open )
|
|
|
1822 |
{
|
|
|
1823 |
FT_StrokeBorder right = stroker->borders + 0;
|
|
|
1824 |
FT_StrokeBorder left = stroker->borders + 1;
|
|
|
1825 |
FT_Int new_points;
|
|
|
1826 |
FT_Error error = FT_Err_Ok;
|
|
|
1827 |
|
|
|
1828 |
|
|
|
1829 |
FT_ASSERT( left->start >= 0 );
|
|
|
1830 |
|
|
|
1831 |
new_points = (FT_Int)left->num_points - left->start;
|
|
|
1832 |
if ( new_points > 0 )
|
|
|
1833 |
{
|
|
|
1834 |
error = ft_stroke_border_grow( right, (FT_UInt)new_points );
|
|
|
1835 |
if ( error )
|
|
|
1836 |
goto Exit;
|
|
|
1837 |
|
|
|
1838 |
{
|
|
|
1839 |
FT_Vector* dst_point = right->points + right->num_points;
|
|
|
1840 |
FT_Byte* dst_tag = right->tags + right->num_points;
|
|
|
1841 |
FT_Vector* src_point = left->points + left->num_points - 1;
|
|
|
1842 |
FT_Byte* src_tag = left->tags + left->num_points - 1;
|
|
|
1843 |
|
|
|
1844 |
|
|
|
1845 |
while ( src_point >= left->points + left->start )
|
|
|
1846 |
{
|
|
|
1847 |
*dst_point = *src_point;
|
|
|
1848 |
*dst_tag = *src_tag;
|
|
|
1849 |
|
|
|
1850 |
if ( open )
|
|
|
1851 |
dst_tag[0] &= ~FT_STROKE_TAG_BEGIN_END;
|
|
|
1852 |
else
|
|
|
1853 |
{
|
|
|
1854 |
FT_Byte ttag =
|
|
|
1855 |
(FT_Byte)( dst_tag[0] & FT_STROKE_TAG_BEGIN_END );
|
|
|
1856 |
|
|
|
1857 |
|
|
|
1858 |
/* switch begin/end tags if necessary */
|
|
|
1859 |
if ( ttag == FT_STROKE_TAG_BEGIN ||
|
|
|
1860 |
ttag == FT_STROKE_TAG_END )
|
|
|
1861 |
dst_tag[0] ^= FT_STROKE_TAG_BEGIN_END;
|
|
|
1862 |
}
|
|
|
1863 |
|
|
|
1864 |
src_point--;
|
|
|
1865 |
src_tag--;
|
|
|
1866 |
dst_point++;
|
|
|
1867 |
dst_tag++;
|
|
|
1868 |
}
|
|
|
1869 |
}
|
|
|
1870 |
|
|
|
1871 |
left->num_points = (FT_UInt)left->start;
|
|
|
1872 |
right->num_points += (FT_UInt)new_points;
|
|
|
1873 |
|
|
|
1874 |
right->movable = FALSE;
|
|
|
1875 |
left->movable = FALSE;
|
|
|
1876 |
}
|
|
|
1877 |
|
|
|
1878 |
Exit:
|
|
|
1879 |
return error;
|
|
|
1880 |
}
|
|
|
1881 |
|
|
|
1882 |
|
|
|
1883 |
/* documentation is in ftstroke.h */
|
|
|
1884 |
|
|
|
1885 |
/* there's a lot of magic in this function! */
|
|
|
1886 |
FT_EXPORT_DEF( FT_Error )
|
|
|
1887 |
FT_Stroker_EndSubPath( FT_Stroker stroker )
|
|
|
1888 |
{
|
|
|
1889 |
FT_Error error = FT_Err_Ok;
|
|
|
1890 |
|
|
|
1891 |
|
|
|
1892 |
if ( !stroker )
|
|
|
1893 |
{
|
|
|
1894 |
error = FT_THROW( Invalid_Argument );
|
|
|
1895 |
goto Exit;
|
|
|
1896 |
}
|
|
|
1897 |
|
|
|
1898 |
if ( stroker->subpath_open )
|
|
|
1899 |
{
|
|
|
1900 |
FT_StrokeBorder right = stroker->borders;
|
|
|
1901 |
|
|
|
1902 |
|
|
|
1903 |
/* All right, this is an opened path, we need to add a cap between */
|
|
|
1904 |
/* right & left, add the reverse of left, then add a final cap */
|
|
|
1905 |
/* between left & right. */
|
|
|
1906 |
error = ft_stroker_cap( stroker, stroker->angle_in, 0 );
|
|
|
1907 |
if ( error )
|
|
|
1908 |
goto Exit;
|
|
|
1909 |
|
|
|
1910 |
/* add reversed points from `left' to `right' */
|
|
|
1911 |
error = ft_stroker_add_reverse_left( stroker, TRUE );
|
|
|
1912 |
if ( error )
|
|
|
1913 |
goto Exit;
|
|
|
1914 |
|
|
|
1915 |
/* now add the final cap */
|
|
|
1916 |
stroker->center = stroker->subpath_start;
|
|
|
1917 |
error = ft_stroker_cap( stroker,
|
|
|
1918 |
stroker->subpath_angle + FT_ANGLE_PI, 0 );
|
|
|
1919 |
if ( error )
|
|
|
1920 |
goto Exit;
|
|
|
1921 |
|
|
|
1922 |
/* Now end the right subpath accordingly. The left one is */
|
|
|
1923 |
/* rewind and doesn't need further processing. */
|
|
|
1924 |
ft_stroke_border_close( right, FALSE );
|
|
|
1925 |
}
|
|
|
1926 |
else
|
|
|
1927 |
{
|
|
|
1928 |
FT_Angle turn;
|
|
|
1929 |
FT_Int inside_side;
|
|
|
1930 |
|
|
|
1931 |
|
|
|
1932 |
/* close the path if needed */
|
|
|
1933 |
if ( stroker->center.x != stroker->subpath_start.x ||
|
|
|
1934 |
stroker->center.y != stroker->subpath_start.y )
|
|
|
1935 |
{
|
|
|
1936 |
error = FT_Stroker_LineTo( stroker, &stroker->subpath_start );
|
|
|
1937 |
if ( error )
|
|
|
1938 |
goto Exit;
|
|
|
1939 |
}
|
|
|
1940 |
|
|
|
1941 |
/* process the corner */
|
|
|
1942 |
stroker->angle_out = stroker->subpath_angle;
|
|
|
1943 |
turn = FT_Angle_Diff( stroker->angle_in,
|
|
|
1944 |
stroker->angle_out );
|
|
|
1945 |
|
|
|
1946 |
/* no specific corner processing is required if the turn is 0 */
|
|
|
1947 |
if ( turn != 0 )
|
|
|
1948 |
{
|
|
|
1949 |
/* when we turn to the right, the inside side is 0 */
|
|
|
1950 |
/* otherwise, the inside side is 1 */
|
|
|
1951 |
inside_side = ( turn < 0 );
|
|
|
1952 |
|
|
|
1953 |
error = ft_stroker_inside( stroker,
|
|
|
1954 |
inside_side,
|
|
|
1955 |
stroker->subpath_line_length );
|
|
|
1956 |
if ( error )
|
|
|
1957 |
goto Exit;
|
|
|
1958 |
|
|
|
1959 |
/* process the outside side */
|
|
|
1960 |
error = ft_stroker_outside( stroker,
|
|
|
1961 |
!inside_side,
|
|
|
1962 |
stroker->subpath_line_length );
|
|
|
1963 |
if ( error )
|
|
|
1964 |
goto Exit;
|
|
|
1965 |
}
|
|
|
1966 |
|
|
|
1967 |
/* then end our two subpaths */
|
|
|
1968 |
ft_stroke_border_close( stroker->borders + 0, FALSE );
|
|
|
1969 |
ft_stroke_border_close( stroker->borders + 1, TRUE );
|
|
|
1970 |
}
|
|
|
1971 |
|
|
|
1972 |
Exit:
|
|
|
1973 |
return error;
|
|
|
1974 |
}
|
|
|
1975 |
|
|
|
1976 |
|
|
|
1977 |
/* documentation is in ftstroke.h */
|
|
|
1978 |
|
|
|
1979 |
FT_EXPORT_DEF( FT_Error )
|
|
|
1980 |
FT_Stroker_GetBorderCounts( FT_Stroker stroker,
|
|
|
1981 |
FT_StrokerBorder border,
|
|
|
1982 |
FT_UInt *anum_points,
|
|
|
1983 |
FT_UInt *anum_contours )
|
|
|
1984 |
{
|
|
|
1985 |
FT_UInt num_points = 0, num_contours = 0;
|
|
|
1986 |
FT_Error error;
|
|
|
1987 |
|
|
|
1988 |
|
|
|
1989 |
if ( !stroker || border > 1 )
|
|
|
1990 |
{
|
|
|
1991 |
error = FT_THROW( Invalid_Argument );
|
|
|
1992 |
goto Exit;
|
|
|
1993 |
}
|
|
|
1994 |
|
|
|
1995 |
error = ft_stroke_border_get_counts( stroker->borders + border,
|
|
|
1996 |
&num_points, &num_contours );
|
|
|
1997 |
Exit:
|
|
|
1998 |
if ( anum_points )
|
|
|
1999 |
*anum_points = num_points;
|
|
|
2000 |
|
|
|
2001 |
if ( anum_contours )
|
|
|
2002 |
*anum_contours = num_contours;
|
|
|
2003 |
|
|
|
2004 |
return error;
|
|
|
2005 |
}
|
|
|
2006 |
|
|
|
2007 |
|
|
|
2008 |
/* documentation is in ftstroke.h */
|
|
|
2009 |
|
|
|
2010 |
FT_EXPORT_DEF( FT_Error )
|
|
|
2011 |
FT_Stroker_GetCounts( FT_Stroker stroker,
|
|
|
2012 |
FT_UInt *anum_points,
|
|
|
2013 |
FT_UInt *anum_contours )
|
|
|
2014 |
{
|
|
|
2015 |
FT_UInt count1, count2, num_points = 0;
|
|
|
2016 |
FT_UInt count3, count4, num_contours = 0;
|
|
|
2017 |
FT_Error error;
|
|
|
2018 |
|
|
|
2019 |
|
|
|
2020 |
if ( !stroker )
|
|
|
2021 |
{
|
|
|
2022 |
error = FT_THROW( Invalid_Argument );
|
|
|
2023 |
goto Exit;
|
|
|
2024 |
}
|
|
|
2025 |
|
|
|
2026 |
error = ft_stroke_border_get_counts( stroker->borders + 0,
|
|
|
2027 |
&count1, &count2 );
|
|
|
2028 |
if ( error )
|
|
|
2029 |
goto Exit;
|
|
|
2030 |
|
|
|
2031 |
error = ft_stroke_border_get_counts( stroker->borders + 1,
|
|
|
2032 |
&count3, &count4 );
|
|
|
2033 |
if ( error )
|
|
|
2034 |
goto Exit;
|
|
|
2035 |
|
|
|
2036 |
num_points = count1 + count3;
|
|
|
2037 |
num_contours = count2 + count4;
|
|
|
2038 |
|
|
|
2039 |
Exit:
|
|
|
2040 |
if ( anum_points )
|
|
|
2041 |
*anum_points = num_points;
|
|
|
2042 |
|
|
|
2043 |
if ( anum_contours )
|
|
|
2044 |
*anum_contours = num_contours;
|
|
|
2045 |
|
|
|
2046 |
return error;
|
|
|
2047 |
}
|
|
|
2048 |
|
|
|
2049 |
|
|
|
2050 |
/* documentation is in ftstroke.h */
|
|
|
2051 |
|
|
|
2052 |
FT_EXPORT_DEF( void )
|
|
|
2053 |
FT_Stroker_ExportBorder( FT_Stroker stroker,
|
|
|
2054 |
FT_StrokerBorder border,
|
|
|
2055 |
FT_Outline* outline )
|
|
|
2056 |
{
|
|
|
2057 |
if ( !stroker || !outline )
|
|
|
2058 |
return;
|
|
|
2059 |
|
|
|
2060 |
if ( border == FT_STROKER_BORDER_LEFT ||
|
|
|
2061 |
border == FT_STROKER_BORDER_RIGHT )
|
|
|
2062 |
{
|
|
|
2063 |
FT_StrokeBorder sborder = & stroker->borders[border];
|
|
|
2064 |
|
|
|
2065 |
|
|
|
2066 |
if ( sborder->valid )
|
|
|
2067 |
ft_stroke_border_export( sborder, outline );
|
|
|
2068 |
}
|
|
|
2069 |
}
|
|
|
2070 |
|
|
|
2071 |
|
|
|
2072 |
/* documentation is in ftstroke.h */
|
|
|
2073 |
|
|
|
2074 |
FT_EXPORT_DEF( void )
|
|
|
2075 |
FT_Stroker_Export( FT_Stroker stroker,
|
|
|
2076 |
FT_Outline* outline )
|
|
|
2077 |
{
|
|
|
2078 |
FT_Stroker_ExportBorder( stroker, FT_STROKER_BORDER_LEFT, outline );
|
|
|
2079 |
FT_Stroker_ExportBorder( stroker, FT_STROKER_BORDER_RIGHT, outline );
|
|
|
2080 |
}
|
|
|
2081 |
|
|
|
2082 |
|
|
|
2083 |
/* documentation is in ftstroke.h */
|
|
|
2084 |
|
|
|
2085 |
/*
|
|
54876
|
2086 |
* The following is very similar to FT_Outline_Decompose, except
|
|
|
2087 |
* that we do support opened paths, and do not scale the outline.
|
|
49234
|
2088 |
*/
|
|
|
2089 |
FT_EXPORT_DEF( FT_Error )
|
|
|
2090 |
FT_Stroker_ParseOutline( FT_Stroker stroker,
|
|
|
2091 |
FT_Outline* outline,
|
|
|
2092 |
FT_Bool opened )
|
|
|
2093 |
{
|
|
|
2094 |
FT_Vector v_last;
|
|
|
2095 |
FT_Vector v_control;
|
|
|
2096 |
FT_Vector v_start;
|
|
|
2097 |
|
|
|
2098 |
FT_Vector* point;
|
|
|
2099 |
FT_Vector* limit;
|
|
|
2100 |
char* tags;
|
|
|
2101 |
|
|
|
2102 |
FT_Error error;
|
|
|
2103 |
|
|
|
2104 |
FT_Int n; /* index of contour in outline */
|
|
|
2105 |
FT_UInt first; /* index of first point in contour */
|
|
|
2106 |
FT_Int tag; /* current point's state */
|
|
|
2107 |
|
|
|
2108 |
|
|
|
2109 |
if ( !outline )
|
|
|
2110 |
return FT_THROW( Invalid_Outline );
|
|
|
2111 |
|
|
|
2112 |
if ( !stroker )
|
|
|
2113 |
return FT_THROW( Invalid_Argument );
|
|
|
2114 |
|
|
|
2115 |
FT_Stroker_Rewind( stroker );
|
|
|
2116 |
|
|
|
2117 |
first = 0;
|
|
|
2118 |
|
|
|
2119 |
for ( n = 0; n < outline->n_contours; n++ )
|
|
|
2120 |
{
|
|
|
2121 |
FT_UInt last; /* index of last point in contour */
|
|
|
2122 |
|
|
|
2123 |
|
|
|
2124 |
last = (FT_UInt)outline->contours[n];
|
|
|
2125 |
limit = outline->points + last;
|
|
|
2126 |
|
|
|
2127 |
/* skip empty points; we don't stroke these */
|
|
|
2128 |
if ( last <= first )
|
|
|
2129 |
{
|
|
|
2130 |
first = last + 1;
|
|
|
2131 |
continue;
|
|
|
2132 |
}
|
|
|
2133 |
|
|
|
2134 |
v_start = outline->points[first];
|
|
|
2135 |
v_last = outline->points[last];
|
|
|
2136 |
|
|
|
2137 |
v_control = v_start;
|
|
|
2138 |
|
|
|
2139 |
point = outline->points + first;
|
|
|
2140 |
tags = outline->tags + first;
|
|
|
2141 |
tag = FT_CURVE_TAG( tags[0] );
|
|
|
2142 |
|
|
|
2143 |
/* A contour cannot start with a cubic control point! */
|
|
|
2144 |
if ( tag == FT_CURVE_TAG_CUBIC )
|
|
|
2145 |
goto Invalid_Outline;
|
|
|
2146 |
|
|
|
2147 |
/* check first point to determine origin */
|
|
|
2148 |
if ( tag == FT_CURVE_TAG_CONIC )
|
|
|
2149 |
{
|
|
|
2150 |
/* First point is conic control. Yes, this happens. */
|
|
|
2151 |
if ( FT_CURVE_TAG( outline->tags[last] ) == FT_CURVE_TAG_ON )
|
|
|
2152 |
{
|
|
|
2153 |
/* start at last point if it is on the curve */
|
|
|
2154 |
v_start = v_last;
|
|
|
2155 |
limit--;
|
|
|
2156 |
}
|
|
|
2157 |
else
|
|
|
2158 |
{
|
|
|
2159 |
/* if both first and last points are conic, */
|
|
|
2160 |
/* start at their middle */
|
|
|
2161 |
v_start.x = ( v_start.x + v_last.x ) / 2;
|
|
|
2162 |
v_start.y = ( v_start.y + v_last.y ) / 2;
|
|
|
2163 |
}
|
|
|
2164 |
point--;
|
|
|
2165 |
tags--;
|
|
|
2166 |
}
|
|
|
2167 |
|
|
|
2168 |
error = FT_Stroker_BeginSubPath( stroker, &v_start, opened );
|
|
|
2169 |
if ( error )
|
|
|
2170 |
goto Exit;
|
|
|
2171 |
|
|
|
2172 |
while ( point < limit )
|
|
|
2173 |
{
|
|
|
2174 |
point++;
|
|
|
2175 |
tags++;
|
|
|
2176 |
|
|
|
2177 |
tag = FT_CURVE_TAG( tags[0] );
|
|
|
2178 |
switch ( tag )
|
|
|
2179 |
{
|
|
|
2180 |
case FT_CURVE_TAG_ON: /* emit a single line_to */
|
|
|
2181 |
{
|
|
|
2182 |
FT_Vector vec;
|
|
|
2183 |
|
|
|
2184 |
|
|
|
2185 |
vec.x = point->x;
|
|
|
2186 |
vec.y = point->y;
|
|
|
2187 |
|
|
|
2188 |
error = FT_Stroker_LineTo( stroker, &vec );
|
|
|
2189 |
if ( error )
|
|
|
2190 |
goto Exit;
|
|
|
2191 |
continue;
|
|
|
2192 |
}
|
|
|
2193 |
|
|
|
2194 |
case FT_CURVE_TAG_CONIC: /* consume conic arcs */
|
|
|
2195 |
v_control.x = point->x;
|
|
|
2196 |
v_control.y = point->y;
|
|
|
2197 |
|
|
|
2198 |
Do_Conic:
|
|
|
2199 |
if ( point < limit )
|
|
|
2200 |
{
|
|
|
2201 |
FT_Vector vec;
|
|
|
2202 |
FT_Vector v_middle;
|
|
|
2203 |
|
|
|
2204 |
|
|
|
2205 |
point++;
|
|
|
2206 |
tags++;
|
|
|
2207 |
tag = FT_CURVE_TAG( tags[0] );
|
|
|
2208 |
|
|
|
2209 |
vec = point[0];
|
|
|
2210 |
|
|
|
2211 |
if ( tag == FT_CURVE_TAG_ON )
|
|
|
2212 |
{
|
|
|
2213 |
error = FT_Stroker_ConicTo( stroker, &v_control, &vec );
|
|
|
2214 |
if ( error )
|
|
|
2215 |
goto Exit;
|
|
|
2216 |
continue;
|
|
|
2217 |
}
|
|
|
2218 |
|
|
|
2219 |
if ( tag != FT_CURVE_TAG_CONIC )
|
|
|
2220 |
goto Invalid_Outline;
|
|
|
2221 |
|
|
|
2222 |
v_middle.x = ( v_control.x + vec.x ) / 2;
|
|
|
2223 |
v_middle.y = ( v_control.y + vec.y ) / 2;
|
|
|
2224 |
|
|
|
2225 |
error = FT_Stroker_ConicTo( stroker, &v_control, &v_middle );
|
|
|
2226 |
if ( error )
|
|
|
2227 |
goto Exit;
|
|
|
2228 |
|
|
|
2229 |
v_control = vec;
|
|
|
2230 |
goto Do_Conic;
|
|
|
2231 |
}
|
|
|
2232 |
|
|
|
2233 |
error = FT_Stroker_ConicTo( stroker, &v_control, &v_start );
|
|
|
2234 |
goto Close;
|
|
|
2235 |
|
|
|
2236 |
default: /* FT_CURVE_TAG_CUBIC */
|
|
|
2237 |
{
|
|
|
2238 |
FT_Vector vec1, vec2;
|
|
|
2239 |
|
|
|
2240 |
|
|
|
2241 |
if ( point + 1 > limit ||
|
|
|
2242 |
FT_CURVE_TAG( tags[1] ) != FT_CURVE_TAG_CUBIC )
|
|
|
2243 |
goto Invalid_Outline;
|
|
|
2244 |
|
|
|
2245 |
point += 2;
|
|
|
2246 |
tags += 2;
|
|
|
2247 |
|
|
|
2248 |
vec1 = point[-2];
|
|
|
2249 |
vec2 = point[-1];
|
|
|
2250 |
|
|
|
2251 |
if ( point <= limit )
|
|
|
2252 |
{
|
|
|
2253 |
FT_Vector vec;
|
|
|
2254 |
|
|
|
2255 |
|
|
|
2256 |
vec = point[0];
|
|
|
2257 |
|
|
|
2258 |
error = FT_Stroker_CubicTo( stroker, &vec1, &vec2, &vec );
|
|
|
2259 |
if ( error )
|
|
|
2260 |
goto Exit;
|
|
|
2261 |
continue;
|
|
|
2262 |
}
|
|
|
2263 |
|
|
|
2264 |
error = FT_Stroker_CubicTo( stroker, &vec1, &vec2, &v_start );
|
|
|
2265 |
goto Close;
|
|
|
2266 |
}
|
|
|
2267 |
}
|
|
|
2268 |
}
|
|
|
2269 |
|
|
|
2270 |
Close:
|
|
|
2271 |
if ( error )
|
|
|
2272 |
goto Exit;
|
|
|
2273 |
|
|
|
2274 |
/* don't try to end the path if no segments have been generated */
|
|
|
2275 |
if ( !stroker->first_point )
|
|
|
2276 |
{
|
|
|
2277 |
error = FT_Stroker_EndSubPath( stroker );
|
|
|
2278 |
if ( error )
|
|
|
2279 |
goto Exit;
|
|
|
2280 |
}
|
|
|
2281 |
|
|
|
2282 |
first = last + 1;
|
|
|
2283 |
}
|
|
|
2284 |
|
|
|
2285 |
return FT_Err_Ok;
|
|
|
2286 |
|
|
|
2287 |
Exit:
|
|
|
2288 |
return error;
|
|
|
2289 |
|
|
|
2290 |
Invalid_Outline:
|
|
|
2291 |
return FT_THROW( Invalid_Outline );
|
|
|
2292 |
}
|
|
|
2293 |
|
|
|
2294 |
|
|
|
2295 |
/* documentation is in ftstroke.h */
|
|
|
2296 |
|
|
|
2297 |
FT_EXPORT_DEF( FT_Error )
|
|
|
2298 |
FT_Glyph_Stroke( FT_Glyph *pglyph,
|
|
|
2299 |
FT_Stroker stroker,
|
|
|
2300 |
FT_Bool destroy )
|
|
|
2301 |
{
|
|
|
2302 |
FT_Error error = FT_ERR( Invalid_Argument );
|
|
|
2303 |
FT_Glyph glyph = NULL;
|
|
|
2304 |
|
|
|
2305 |
|
|
|
2306 |
if ( !pglyph )
|
|
|
2307 |
goto Exit;
|
|
|
2308 |
|
|
|
2309 |
glyph = *pglyph;
|
|
54876
|
2310 |
if ( !glyph || glyph->clazz != &ft_outline_glyph_class )
|
|
49234
|
2311 |
goto Exit;
|
|
|
2312 |
|
|
|
2313 |
{
|
|
|
2314 |
FT_Glyph copy;
|
|
|
2315 |
|
|
|
2316 |
|
|
|
2317 |
error = FT_Glyph_Copy( glyph, © );
|
|
|
2318 |
if ( error )
|
|
|
2319 |
goto Exit;
|
|
|
2320 |
|
|
|
2321 |
glyph = copy;
|
|
|
2322 |
}
|
|
|
2323 |
|
|
|
2324 |
{
|
|
|
2325 |
FT_OutlineGlyph oglyph = (FT_OutlineGlyph)glyph;
|
|
|
2326 |
FT_Outline* outline = &oglyph->outline;
|
|
|
2327 |
FT_UInt num_points, num_contours;
|
|
|
2328 |
|
|
|
2329 |
|
|
|
2330 |
error = FT_Stroker_ParseOutline( stroker, outline, FALSE );
|
|
|
2331 |
if ( error )
|
|
|
2332 |
goto Fail;
|
|
|
2333 |
|
|
|
2334 |
FT_Stroker_GetCounts( stroker, &num_points, &num_contours );
|
|
|
2335 |
|
|
|
2336 |
FT_Outline_Done( glyph->library, outline );
|
|
|
2337 |
|
|
|
2338 |
error = FT_Outline_New( glyph->library,
|
|
|
2339 |
num_points,
|
|
|
2340 |
(FT_Int)num_contours,
|
|
|
2341 |
outline );
|
|
|
2342 |
if ( error )
|
|
|
2343 |
goto Fail;
|
|
|
2344 |
|
|
|
2345 |
outline->n_points = 0;
|
|
|
2346 |
outline->n_contours = 0;
|
|
|
2347 |
|
|
|
2348 |
FT_Stroker_Export( stroker, outline );
|
|
|
2349 |
}
|
|
|
2350 |
|
|
|
2351 |
if ( destroy )
|
|
|
2352 |
FT_Done_Glyph( *pglyph );
|
|
|
2353 |
|
|
|
2354 |
*pglyph = glyph;
|
|
|
2355 |
goto Exit;
|
|
|
2356 |
|
|
|
2357 |
Fail:
|
|
|
2358 |
FT_Done_Glyph( glyph );
|
|
|
2359 |
glyph = NULL;
|
|
|
2360 |
|
|
|
2361 |
if ( !destroy )
|
|
|
2362 |
*pglyph = NULL;
|
|
|
2363 |
|
|
|
2364 |
Exit:
|
|
|
2365 |
return error;
|
|
|
2366 |
}
|
|
|
2367 |
|
|
|
2368 |
|
|
|
2369 |
/* documentation is in ftstroke.h */
|
|
|
2370 |
|
|
|
2371 |
FT_EXPORT_DEF( FT_Error )
|
|
|
2372 |
FT_Glyph_StrokeBorder( FT_Glyph *pglyph,
|
|
|
2373 |
FT_Stroker stroker,
|
|
|
2374 |
FT_Bool inside,
|
|
|
2375 |
FT_Bool destroy )
|
|
|
2376 |
{
|
|
|
2377 |
FT_Error error = FT_ERR( Invalid_Argument );
|
|
|
2378 |
FT_Glyph glyph = NULL;
|
|
|
2379 |
|
|
|
2380 |
|
|
|
2381 |
if ( !pglyph )
|
|
|
2382 |
goto Exit;
|
|
|
2383 |
|
|
|
2384 |
glyph = *pglyph;
|
|
54876
|
2385 |
if ( !glyph || glyph->clazz != &ft_outline_glyph_class )
|
|
49234
|
2386 |
goto Exit;
|
|
|
2387 |
|
|
|
2388 |
{
|
|
|
2389 |
FT_Glyph copy;
|
|
|
2390 |
|
|
|
2391 |
|
|
|
2392 |
error = FT_Glyph_Copy( glyph, © );
|
|
|
2393 |
if ( error )
|
|
|
2394 |
goto Exit;
|
|
|
2395 |
|
|
|
2396 |
glyph = copy;
|
|
|
2397 |
}
|
|
|
2398 |
|
|
|
2399 |
{
|
|
|
2400 |
FT_OutlineGlyph oglyph = (FT_OutlineGlyph)glyph;
|
|
|
2401 |
FT_StrokerBorder border;
|
|
|
2402 |
FT_Outline* outline = &oglyph->outline;
|
|
|
2403 |
FT_UInt num_points, num_contours;
|
|
|
2404 |
|
|
|
2405 |
|
|
|
2406 |
border = FT_Outline_GetOutsideBorder( outline );
|
|
|
2407 |
if ( inside )
|
|
|
2408 |
{
|
|
|
2409 |
if ( border == FT_STROKER_BORDER_LEFT )
|
|
|
2410 |
border = FT_STROKER_BORDER_RIGHT;
|
|
|
2411 |
else
|
|
|
2412 |
border = FT_STROKER_BORDER_LEFT;
|
|
|
2413 |
}
|
|
|
2414 |
|
|
|
2415 |
error = FT_Stroker_ParseOutline( stroker, outline, FALSE );
|
|
|
2416 |
if ( error )
|
|
|
2417 |
goto Fail;
|
|
|
2418 |
|
|
|
2419 |
FT_Stroker_GetBorderCounts( stroker, border,
|
|
|
2420 |
&num_points, &num_contours );
|
|
|
2421 |
|
|
|
2422 |
FT_Outline_Done( glyph->library, outline );
|
|
|
2423 |
|
|
|
2424 |
error = FT_Outline_New( glyph->library,
|
|
|
2425 |
num_points,
|
|
|
2426 |
(FT_Int)num_contours,
|
|
|
2427 |
outline );
|
|
|
2428 |
if ( error )
|
|
|
2429 |
goto Fail;
|
|
|
2430 |
|
|
|
2431 |
outline->n_points = 0;
|
|
|
2432 |
outline->n_contours = 0;
|
|
|
2433 |
|
|
|
2434 |
FT_Stroker_ExportBorder( stroker, border, outline );
|
|
|
2435 |
}
|
|
|
2436 |
|
|
|
2437 |
if ( destroy )
|
|
|
2438 |
FT_Done_Glyph( *pglyph );
|
|
|
2439 |
|
|
|
2440 |
*pglyph = glyph;
|
|
|
2441 |
goto Exit;
|
|
|
2442 |
|
|
|
2443 |
Fail:
|
|
|
2444 |
FT_Done_Glyph( glyph );
|
|
|
2445 |
glyph = NULL;
|
|
|
2446 |
|
|
|
2447 |
if ( !destroy )
|
|
|
2448 |
*pglyph = NULL;
|
|
|
2449 |
|
|
|
2450 |
Exit:
|
|
|
2451 |
return error;
|
|
|
2452 |
}
|
|
|
2453 |
|
|
|
2454 |
|
|
|
2455 |
/* END */
|