Go to most recent revision | Details | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
5496 | leency | 1 | /***************************************************************************/ |
2 | /* */ |
||
3 | /* ftoutln.h */ |
||
4 | /* */ |
||
5 | /* Support for the FT_Outline type used to store glyph shapes of */ |
||
6 | /* most scalable font formats (specification). */ |
||
7 | /* */ |
||
8 | /* Copyright 1996-2001, 2002, 2003, 2005, 2006, 2007, 2008, 2009, 2010 by */ |
||
9 | /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
||
10 | /* */ |
||
11 | /* This file is part of the FreeType project, and may only be used, */ |
||
12 | /* modified, and distributed under the terms of the FreeType project */ |
||
13 | /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
||
14 | /* this file you indicate that you have read the license and */ |
||
15 | /* understand and accept it fully. */ |
||
16 | /* */ |
||
17 | /***************************************************************************/ |
||
18 | |||
19 | |||
20 | #ifndef __FTOUTLN_H__ |
||
21 | #define __FTOUTLN_H__ |
||
22 | |||
23 | |||
24 | #include |
||
25 | #include FT_FREETYPE_H |
||
26 | |||
27 | #ifdef FREETYPE_H |
||
28 | #error "freetype.h of FreeType 1 has been loaded!" |
||
29 | #error "Please fix the directory search order for header files" |
||
30 | #error "so that freetype.h of FreeType 2 is found first." |
||
31 | #endif |
||
32 | |||
33 | |||
34 | FT_BEGIN_HEADER |
||
35 | |||
36 | |||
37 | /*************************************************************************/ |
||
38 | /* */ |
||
39 | /* |
||
40 | /* outline_processing */ |
||
41 | /* */ |
||
42 | /* |
||
43 | /* Outline Processing */ |
||
44 | /* */ |
||
45 | /* |
||
46 | /* Functions to create, transform, and render vectorial glyph images. */ |
||
47 | /* */ |
||
48 | /* |
||
49 | /* This section contains routines used to create and destroy scalable */ |
||
50 | /* glyph images known as `outlines'. These can also be measured, */ |
||
51 | /* transformed, and converted into bitmaps and pixmaps. */ |
||
52 | /* */ |
||
53 | /* |
||
54 | /* FT_Outline */ |
||
55 | /* FT_OUTLINE_FLAGS */ |
||
56 | /* FT_Outline_New */ |
||
57 | /* FT_Outline_Done */ |
||
58 | /* FT_Outline_Copy */ |
||
59 | /* FT_Outline_Translate */ |
||
60 | /* FT_Outline_Transform */ |
||
61 | /* FT_Outline_Embolden */ |
||
62 | /* FT_Outline_Reverse */ |
||
63 | /* FT_Outline_Check */ |
||
64 | /* */ |
||
65 | /* FT_Outline_Get_CBox */ |
||
66 | /* FT_Outline_Get_BBox */ |
||
67 | /* */ |
||
68 | /* FT_Outline_Get_Bitmap */ |
||
69 | /* FT_Outline_Render */ |
||
70 | /* */ |
||
71 | /* FT_Outline_Decompose */ |
||
72 | /* FT_Outline_Funcs */ |
||
73 | /* FT_Outline_MoveTo_Func */ |
||
74 | /* FT_Outline_LineTo_Func */ |
||
75 | /* FT_Outline_ConicTo_Func */ |
||
76 | /* FT_Outline_CubicTo_Func */ |
||
77 | /* */ |
||
78 | /*************************************************************************/ |
||
79 | |||
80 | |||
81 | /*************************************************************************/ |
||
82 | /* */ |
||
83 | /* |
||
84 | /* FT_Outline_Decompose */ |
||
85 | /* */ |
||
86 | /* |
||
87 | /* Walk over an outline's structure to decompose it into individual */ |
||
88 | /* segments and Bézier arcs. This function also emits `move to' */ |
||
89 | /* operations to indicate the start of new contours in the outline. */ |
||
90 | /* */ |
||
91 | /* */ |
||
92 | /* outline :: A pointer to the source target. */ |
||
93 | /* */ |
||
94 | /* func_interface :: A table of `emitters', i.e., function pointers */ |
||
95 | /* called during decomposition to indicate path */ |
||
96 | /* operations. */ |
||
97 | /* */ |
||
98 | /* |
||
99 | /* user :: A typeless pointer which is passed to each */ |
||
100 | /* emitter during the decomposition. It can be */ |
||
101 | /* used to store the state during the */ |
||
102 | /* decomposition. */ |
||
103 | /* */ |
||
104 | /* |
||
105 | /* FreeType error code. 0~means success. */ |
||
106 | /* */ |
||
107 | FT_EXPORT( FT_Error ) |
||
108 | FT_Outline_Decompose( FT_Outline* outline, |
||
109 | const FT_Outline_Funcs* func_interface, |
||
110 | void* user ); |
||
111 | |||
112 | |||
113 | /*************************************************************************/ |
||
114 | /* */ |
||
115 | /* |
||
116 | /* FT_Outline_New */ |
||
117 | /* */ |
||
118 | /* |
||
119 | /* Create a new outline of a given size. */ |
||
120 | /* */ |
||
121 | /* */ |
||
122 | /* library :: A handle to the library object from where the */ |
||
123 | /* outline is allocated. Note however that the new */ |
||
124 | /* outline will *not* necessarily be *freed*, when */ |
||
125 | /* destroying the library, by @FT_Done_FreeType. */ |
||
126 | /* */ |
||
127 | /* numPoints :: The maximal number of points within the outline. */ |
||
128 | /* */ |
||
129 | /* numContours :: The maximal number of contours within the outline. */ |
||
130 | /* */ |
||
131 | /* |
||
132 | /* anoutline :: A handle to the new outline. */ |
||
133 | /* */ |
||
134 | /* |
||
135 | /* FreeType error code. 0~means success. */ |
||
136 | /* */ |
||
137 | /* |
||
138 | /* The reason why this function takes a `library' parameter is simply */ |
||
139 | /* to use the library's memory allocator. */ |
||
140 | /* */ |
||
141 | FT_EXPORT( FT_Error ) |
||
142 | FT_Outline_New( FT_Library library, |
||
143 | FT_UInt numPoints, |
||
144 | FT_Int numContours, |
||
145 | FT_Outline *anoutline ); |
||
146 | |||
147 | |||
148 | FT_EXPORT( FT_Error ) |
||
149 | FT_Outline_New_Internal( FT_Memory memory, |
||
150 | FT_UInt numPoints, |
||
151 | FT_Int numContours, |
||
152 | FT_Outline *anoutline ); |
||
153 | |||
154 | |||
155 | /*************************************************************************/ |
||
156 | /* */ |
||
157 | /* |
||
158 | /* FT_Outline_Done */ |
||
159 | /* */ |
||
160 | /* |
||
161 | /* Destroy an outline created with @FT_Outline_New. */ |
||
162 | /* */ |
||
163 | /* */ |
||
164 | /* library :: A handle of the library object used to allocate the */ |
||
165 | /* outline. */ |
||
166 | /* */ |
||
167 | /* outline :: A pointer to the outline object to be discarded. */ |
||
168 | /* */ |
||
169 | /* |
||
170 | /* FreeType error code. 0~means success. */ |
||
171 | /* */ |
||
172 | /* |
||
173 | /* If the outline's `owner' field is not set, only the outline */ |
||
174 | /* descriptor will be released. */ |
||
175 | /* */ |
||
176 | /* The reason why this function takes an `library' parameter is */ |
||
177 | /* simply to use ft_mem_free(). */ |
||
178 | /* */ |
||
179 | FT_EXPORT( FT_Error ) |
||
180 | FT_Outline_Done( FT_Library library, |
||
181 | FT_Outline* outline ); |
||
182 | |||
183 | |||
184 | FT_EXPORT( FT_Error ) |
||
185 | FT_Outline_Done_Internal( FT_Memory memory, |
||
186 | FT_Outline* outline ); |
||
187 | |||
188 | |||
189 | /*************************************************************************/ |
||
190 | /* */ |
||
191 | /* |
||
192 | /* FT_Outline_Check */ |
||
193 | /* */ |
||
194 | /* |
||
195 | /* Check the contents of an outline descriptor. */ |
||
196 | /* */ |
||
197 | /* */ |
||
198 | /* outline :: A handle to a source outline. */ |
||
199 | /* */ |
||
200 | /* |
||
201 | /* FreeType error code. 0~means success. */ |
||
202 | /* */ |
||
203 | FT_EXPORT( FT_Error ) |
||
204 | FT_Outline_Check( FT_Outline* outline ); |
||
205 | |||
206 | |||
207 | /*************************************************************************/ |
||
208 | /* */ |
||
209 | /* |
||
210 | /* FT_Outline_Get_CBox */ |
||
211 | /* */ |
||
212 | /* |
||
213 | /* Return an outline's `control box'. The control box encloses all */ |
||
214 | /* the outline's points, including Bézier control points. Though it */ |
||
215 | /* coincides with the exact bounding box for most glyphs, it can be */ |
||
216 | /* slightly larger in some situations (like when rotating an outline */ |
||
217 | /* which contains Bézier outside arcs). */ |
||
218 | /* */ |
||
219 | /* Computing the control box is very fast, while getting the bounding */ |
||
220 | /* box can take much more time as it needs to walk over all segments */ |
||
221 | /* and arcs in the outline. To get the latter, you can use the */ |
||
222 | /* `ftbbox' component which is dedicated to this single task. */ |
||
223 | /* */ |
||
224 | /* */ |
||
225 | /* outline :: A pointer to the source outline descriptor. */ |
||
226 | /* */ |
||
227 | /* |
||
228 | /* acbox :: The outline's control box. */ |
||
229 | /* */ |
||
230 | FT_EXPORT( void ) |
||
231 | FT_Outline_Get_CBox( const FT_Outline* outline, |
||
232 | FT_BBox *acbox ); |
||
233 | |||
234 | |||
235 | /*************************************************************************/ |
||
236 | /* */ |
||
237 | /* |
||
238 | /* FT_Outline_Translate */ |
||
239 | /* */ |
||
240 | /* |
||
241 | /* Apply a simple translation to the points of an outline. */ |
||
242 | /* */ |
||
243 | /* |
||
244 | /* outline :: A pointer to the target outline descriptor. */ |
||
245 | /* */ |
||
246 | /* */ |
||
247 | /* xOffset :: The horizontal offset. */ |
||
248 | /* */ |
||
249 | /* yOffset :: The vertical offset. */ |
||
250 | /* */ |
||
251 | FT_EXPORT( void ) |
||
252 | FT_Outline_Translate( const FT_Outline* outline, |
||
253 | FT_Pos xOffset, |
||
254 | FT_Pos yOffset ); |
||
255 | |||
256 | |||
257 | /*************************************************************************/ |
||
258 | /* */ |
||
259 | /* |
||
260 | /* FT_Outline_Copy */ |
||
261 | /* */ |
||
262 | /* |
||
263 | /* Copy an outline into another one. Both objects must have the */ |
||
264 | /* same sizes (number of points & number of contours) when this */ |
||
265 | /* function is called. */ |
||
266 | /* */ |
||
267 | /* */ |
||
268 | /* source :: A handle to the source outline. */ |
||
269 | /* */ |
||
270 | /* |
||
271 | /* target :: A handle to the target outline. */ |
||
272 | /* */ |
||
273 | /* |
||
274 | /* FreeType error code. 0~means success. */ |
||
275 | /* */ |
||
276 | FT_EXPORT( FT_Error ) |
||
277 | FT_Outline_Copy( const FT_Outline* source, |
||
278 | FT_Outline *target ); |
||
279 | |||
280 | |||
281 | /*************************************************************************/ |
||
282 | /* */ |
||
283 | /* |
||
284 | /* FT_Outline_Transform */ |
||
285 | /* */ |
||
286 | /* |
||
287 | /* Apply a simple 2x2 matrix to all of an outline's points. Useful */ |
||
288 | /* for applying rotations, slanting, flipping, etc. */ |
||
289 | /* */ |
||
290 | /* |
||
291 | /* outline :: A pointer to the target outline descriptor. */ |
||
292 | /* */ |
||
293 | /* */ |
||
294 | /* matrix :: A pointer to the transformation matrix. */ |
||
295 | /* */ |
||
296 | /* |
||
297 | /* You can use @FT_Outline_Translate if you need to translate the */ |
||
298 | /* outline's points. */ |
||
299 | /* */ |
||
300 | FT_EXPORT( void ) |
||
301 | FT_Outline_Transform( const FT_Outline* outline, |
||
302 | const FT_Matrix* matrix ); |
||
303 | |||
304 | |||
305 | /*************************************************************************/ |
||
306 | /* */ |
||
307 | /* |
||
308 | /* FT_Outline_Embolden */ |
||
309 | /* */ |
||
310 | /* |
||
311 | /* Embolden an outline. The new outline will be at most 4~times */ |
||
312 | /* `strength' pixels wider and higher. You may think of the left and */ |
||
313 | /* bottom borders as unchanged. */ |
||
314 | /* */ |
||
315 | /* Negative `strength' values to reduce the outline thickness are */ |
||
316 | /* possible also. */ |
||
317 | /* */ |
||
318 | /* |
||
319 | /* outline :: A handle to the target outline. */ |
||
320 | /* */ |
||
321 | /* */ |
||
322 | /* strength :: How strong the glyph is emboldened. Expressed in */ |
||
323 | /* 26.6 pixel format. */ |
||
324 | /* */ |
||
325 | /* |
||
326 | /* FreeType error code. 0~means success. */ |
||
327 | /* */ |
||
328 | /* |
||
329 | /* The used algorithm to increase or decrease the thickness of the */ |
||
330 | /* glyph doesn't change the number of points; this means that certain */ |
||
331 | /* situations like acute angles or intersections are sometimes */ |
||
332 | /* handled incorrectly. */ |
||
333 | /* */ |
||
334 | /* If you need `better' metrics values you should call */ |
||
335 | /* @FT_Outline_Get_CBox ot @FT_Outline_Get_BBox. */ |
||
336 | /* */ |
||
337 | /* Example call: */ |
||
338 | /* */ |
||
339 | /* { */ |
||
340 | /* FT_Load_Glyph( face, index, FT_LOAD_DEFAULT ); */ |
||
341 | /* if ( face->slot->format == FT_GLYPH_FORMAT_OUTLINE ) */ |
||
342 | /* FT_Outline_Embolden( &face->slot->outline, strength ); */ |
||
343 | /* } */ |
||
344 | /* */ |
||
345 | FT_EXPORT( FT_Error ) |
||
346 | FT_Outline_Embolden( FT_Outline* outline, |
||
347 | FT_Pos strength ); |
||
348 | |||
349 | |||
350 | /*************************************************************************/ |
||
351 | /* */ |
||
352 | /* |
||
353 | /* FT_Outline_Reverse */ |
||
354 | /* */ |
||
355 | /* |
||
356 | /* Reverse the drawing direction of an outline. This is used to */ |
||
357 | /* ensure consistent fill conventions for mirrored glyphs. */ |
||
358 | /* */ |
||
359 | /* |
||
360 | /* outline :: A pointer to the target outline descriptor. */ |
||
361 | /* */ |
||
362 | /* |
||
363 | /* This function toggles the bit flag @FT_OUTLINE_REVERSE_FILL in */ |
||
364 | /* the outline's `flags' field. */ |
||
365 | /* */ |
||
366 | /* It shouldn't be used by a normal client application, unless it */ |
||
367 | /* knows what it is doing. */ |
||
368 | /* */ |
||
369 | FT_EXPORT( void ) |
||
370 | FT_Outline_Reverse( FT_Outline* outline ); |
||
371 | |||
372 | |||
373 | /*************************************************************************/ |
||
374 | /* */ |
||
375 | /* |
||
376 | /* FT_Outline_Get_Bitmap */ |
||
377 | /* */ |
||
378 | /* |
||
379 | /* Render an outline within a bitmap. The outline's image is simply */ |
||
380 | /* OR-ed to the target bitmap. */ |
||
381 | /* */ |
||
382 | /* */ |
||
383 | /* library :: A handle to a FreeType library object. */ |
||
384 | /* */ |
||
385 | /* outline :: A pointer to the source outline descriptor. */ |
||
386 | /* */ |
||
387 | /* |
||
388 | /* abitmap :: A pointer to the target bitmap descriptor. */ |
||
389 | /* */ |
||
390 | /* |
||
391 | /* FreeType error code. 0~means success. */ |
||
392 | /* */ |
||
393 | /* |
||
394 | /* This function does NOT CREATE the bitmap, it only renders an */ |
||
395 | /* outline image within the one you pass to it! Consequently, the */ |
||
396 | /* various fields in `abitmap' should be set accordingly. */ |
||
397 | /* */ |
||
398 | /* It will use the raster corresponding to the default glyph format. */ |
||
399 | /* */ |
||
400 | /* The value of the `num_grays' field in `abitmap' is ignored. If */ |
||
401 | /* you select the gray-level rasterizer, and you want less than 256 */ |
||
402 | /* gray levels, you have to use @FT_Outline_Render directly. */ |
||
403 | /* */ |
||
404 | FT_EXPORT( FT_Error ) |
||
405 | FT_Outline_Get_Bitmap( FT_Library library, |
||
406 | FT_Outline* outline, |
||
407 | const FT_Bitmap *abitmap ); |
||
408 | |||
409 | |||
410 | /*************************************************************************/ |
||
411 | /* */ |
||
412 | /* |
||
413 | /* FT_Outline_Render */ |
||
414 | /* */ |
||
415 | /* |
||
416 | /* Render an outline within a bitmap using the current scan-convert. */ |
||
417 | /* This function uses an @FT_Raster_Params structure as an argument, */ |
||
418 | /* allowing advanced features like direct composition, translucency, */ |
||
419 | /* etc. */ |
||
420 | /* */ |
||
421 | /* */ |
||
422 | /* library :: A handle to a FreeType library object. */ |
||
423 | /* */ |
||
424 | /* outline :: A pointer to the source outline descriptor. */ |
||
425 | /* */ |
||
426 | /* |
||
427 | /* params :: A pointer to an @FT_Raster_Params structure used to */ |
||
428 | /* describe the rendering operation. */ |
||
429 | /* */ |
||
430 | /* |
||
431 | /* FreeType error code. 0~means success. */ |
||
432 | /* */ |
||
433 | /* |
||
434 | /* You should know what you are doing and how @FT_Raster_Params works */ |
||
435 | /* to use this function. */ |
||
436 | /* */ |
||
437 | /* The field `params.source' will be set to `outline' before the scan */ |
||
438 | /* converter is called, which means that the value you give to it is */ |
||
439 | /* actually ignored. */ |
||
440 | /* */ |
||
441 | /* The gray-level rasterizer always uses 256 gray levels. If you */ |
||
442 | /* want less gray levels, you have to provide your own span callback. */ |
||
443 | /* See the @FT_RASTER_FLAG_DIRECT value of the `flags' field in the */ |
||
444 | /* @FT_Raster_Params structure for more details. */ |
||
445 | /* */ |
||
446 | FT_EXPORT( FT_Error ) |
||
447 | FT_Outline_Render( FT_Library library, |
||
448 | FT_Outline* outline, |
||
449 | FT_Raster_Params* params ); |
||
450 | |||
451 | |||
452 | /************************************************************************** |
||
453 | * |
||
454 | * @enum: |
||
455 | * FT_Orientation |
||
456 | * |
||
457 | * @description: |
||
458 | * A list of values used to describe an outline's contour orientation. |
||
459 | * |
||
460 | * The TrueType and PostScript specifications use different conventions |
||
461 | * to determine whether outline contours should be filled or unfilled. |
||
462 | * |
||
463 | * @values: |
||
464 | * FT_ORIENTATION_TRUETYPE :: |
||
465 | * According to the TrueType specification, clockwise contours must |
||
466 | * be filled, and counter-clockwise ones must be unfilled. |
||
467 | * |
||
468 | * FT_ORIENTATION_POSTSCRIPT :: |
||
469 | * According to the PostScript specification, counter-clockwise contours |
||
470 | * must be filled, and clockwise ones must be unfilled. |
||
471 | * |
||
472 | * FT_ORIENTATION_FILL_RIGHT :: |
||
473 | * This is identical to @FT_ORIENTATION_TRUETYPE, but is used to |
||
474 | * remember that in TrueType, everything that is to the right of |
||
475 | * the drawing direction of a contour must be filled. |
||
476 | * |
||
477 | * FT_ORIENTATION_FILL_LEFT :: |
||
478 | * This is identical to @FT_ORIENTATION_POSTSCRIPT, but is used to |
||
479 | * remember that in PostScript, everything that is to the left of |
||
480 | * the drawing direction of a contour must be filled. |
||
481 | * |
||
482 | * FT_ORIENTATION_NONE :: |
||
483 | * The orientation cannot be determined. That is, different parts of |
||
484 | * the glyph have different orientation. |
||
485 | * |
||
486 | */ |
||
487 | typedef enum FT_Orientation_ |
||
488 | { |
||
489 | FT_ORIENTATION_TRUETYPE = 0, |
||
490 | FT_ORIENTATION_POSTSCRIPT = 1, |
||
491 | FT_ORIENTATION_FILL_RIGHT = FT_ORIENTATION_TRUETYPE, |
||
492 | FT_ORIENTATION_FILL_LEFT = FT_ORIENTATION_POSTSCRIPT, |
||
493 | FT_ORIENTATION_NONE |
||
494 | |||
495 | } FT_Orientation; |
||
496 | |||
497 | |||
498 | /************************************************************************** |
||
499 | * |
||
500 | * @function: |
||
501 | * FT_Outline_Get_Orientation |
||
502 | * |
||
503 | * @description: |
||
504 | * This function analyzes a glyph outline and tries to compute its |
||
505 | * fill orientation (see @FT_Orientation). This is done by computing |
||
506 | * the direction of each global horizontal and/or vertical extrema |
||
507 | * within the outline. |
||
508 | * |
||
509 | * Note that this will return @FT_ORIENTATION_TRUETYPE for empty |
||
510 | * outlines. |
||
511 | * |
||
512 | * @input: |
||
513 | * outline :: |
||
514 | * A handle to the source outline. |
||
515 | * |
||
516 | * @return: |
||
517 | * The orientation. |
||
518 | * |
||
519 | */ |
||
520 | FT_EXPORT( FT_Orientation ) |
||
521 | FT_Outline_Get_Orientation( FT_Outline* outline ); |
||
522 | |||
523 | |||
524 | /* */ |
||
525 | |||
526 | |||
527 | FT_END_HEADER |
||
528 | |||
529 | #endif /* __FTOUTLN_H__ */ |
||
530 | |||
531 | |||
532 | /* END */ |
||
533 | |||
534 | |||
535 | /* Local Variables: */ |
||
536 | /* coding: utf-8 */ |
||
537 | /* End: */ |