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1 /***************************************************************************/ | |
2 /* */ | |
3 /* ftglyph.h */ | |
4 /* */ | |
5 /* FreeType convenience functions to handle glyphs (specification). */ | |
6 /* */ | |
7 /* Copyright 1996-2003, 2006, 2008, 2009, 2011 by */ | |
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ | |
9 /* */ | |
10 /* This file is part of the FreeType project, and may only be used, */ | |
11 /* modified, and distributed under the terms of the FreeType project */ | |
12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ | |
13 /* this file you indicate that you have read the license and */ | |
14 /* understand and accept it fully. */ | |
15 /* */ | |
16 /***************************************************************************/ | |
17 | |
18 | |
19 /*************************************************************************/ | |
20 /* */ | |
21 /* This file contains the definition of several convenience functions */ | |
22 /* that can be used by client applications to easily retrieve glyph */ | |
23 /* bitmaps and outlines from a given face. */ | |
24 /* */ | |
25 /* These functions should be optional if you are writing a font server */ | |
26 /* or text layout engine on top of FreeType. However, they are pretty */ | |
27 /* handy for many other simple uses of the library. */ | |
28 /* */ | |
29 /*************************************************************************/ | |
30 | |
31 | |
32 #ifndef __FTGLYPH_H__ | |
33 #define __FTGLYPH_H__ | |
34 | |
35 | |
36 #include "../ft2build.h" | |
37 #include "freetype.h" | |
38 | |
39 #ifdef FREETYPE_H | |
40 #error "freetype.h of FreeType 1 has been loaded!" | |
41 #error "Please fix the directory search order for header files" | |
42 #error "so that freetype.h of FreeType 2 is found first." | |
43 #endif | |
44 | |
45 | |
46 FT_BEGIN_HEADER | |
47 | |
48 | |
49 /*************************************************************************/ | |
50 /* */ | |
51 /* <Section> */ | |
52 /* glyph_management */ | |
53 /* */ | |
54 /* <Title> */ | |
55 /* Glyph Management */ | |
56 /* */ | |
57 /* <Abstract> */ | |
58 /* Generic interface to manage individual glyph data. */ | |
59 /* */ | |
60 /* <Description> */ | |
61 /* This section contains definitions used to manage glyph data */ | |
62 /* through generic FT_Glyph objects. Each of them can contain a */ | |
63 /* bitmap, a vector outline, or even images in other formats. */ | |
64 /* */ | |
65 /*************************************************************************/ | |
66 | |
67 | |
68 /* forward declaration to a private type */ | |
69 typedef struct FT_Glyph_Class_ FT_Glyph_Class; | |
70 | |
71 | |
72 /*************************************************************************/ | |
73 /* */ | |
74 /* <Type> */ | |
75 /* FT_Glyph */ | |
76 /* */ | |
77 /* <Description> */ | |
78 /* Handle to an object used to model generic glyph images. It is a */ | |
79 /* pointer to the @FT_GlyphRec structure and can contain a glyph */ | |
80 /* bitmap or pointer. */ | |
81 /* */ | |
82 /* <Note> */ | |
83 /* Glyph objects are not owned by the library. You must thus release */ | |
84 /* them manually (through @FT_Done_Glyph) _before_ calling */ | |
85 /* @FT_Done_FreeType. */ | |
86 /* */ | |
87 typedef struct FT_GlyphRec_* FT_Glyph; | |
88 | |
89 | |
90 /*************************************************************************/ | |
91 /* */ | |
92 /* <Struct> */ | |
93 /* FT_GlyphRec */ | |
94 /* */ | |
95 /* <Description> */ | |
96 /* The root glyph structure contains a given glyph image plus its */ | |
97 /* advance width in 16.16 fixed-point format. */ | |
98 /* */ | |
99 /* <Fields> */ | |
100 /* library :: A handle to the FreeType library object. */ | |
101 /* */ | |
102 /* clazz :: A pointer to the glyph's class. Private. */ | |
103 /* */ | |
104 /* format :: The format of the glyph's image. */ | |
105 /* */ | |
106 /* advance :: A 16.16 vector that gives the glyph's advance width. */ | |
107 /* */ | |
108 typedef struct FT_GlyphRec_ | |
109 { | |
110 FT_Library library; | |
111 const FT_Glyph_Class* clazz; | |
112 FT_Glyph_Format format; | |
113 FT_Vector advance; | |
114 | |
115 } FT_GlyphRec; | |
116 | |
117 | |
118 /*************************************************************************/ | |
119 /* */ | |
120 /* <Type> */ | |
121 /* FT_BitmapGlyph */ | |
122 /* */ | |
123 /* <Description> */ | |
124 /* A handle to an object used to model a bitmap glyph image. This is */ | |
125 /* a sub-class of @FT_Glyph, and a pointer to @FT_BitmapGlyphRec. */ | |
126 /* */ | |
127 typedef struct FT_BitmapGlyphRec_* FT_BitmapGlyph; | |
128 | |
129 | |
130 /*************************************************************************/ | |
131 /* */ | |
132 /* <Struct> */ | |
133 /* FT_BitmapGlyphRec */ | |
134 /* */ | |
135 /* <Description> */ | |
136 /* A structure used for bitmap glyph images. This really is a */ | |
137 /* `sub-class' of @FT_GlyphRec. */ | |
138 /* */ | |
139 /* <Fields> */ | |
140 /* root :: The root @FT_Glyph fields. */ | |
141 /* */ | |
142 /* left :: The left-side bearing, i.e., the horizontal distance */ | |
143 /* from the current pen position to the left border of the */ | |
144 /* glyph bitmap. */ | |
145 /* */ | |
146 /* top :: The top-side bearing, i.e., the vertical distance from */ | |
147 /* the current pen position to the top border of the glyph */ | |
148 /* bitmap. This distance is positive for upwards~y! */ | |
149 /* */ | |
150 /* bitmap :: A descriptor for the bitmap. */ | |
151 /* */ | |
152 /* <Note> */ | |
153 /* You can typecast an @FT_Glyph to @FT_BitmapGlyph if you have */ | |
154 /* `glyph->format == FT_GLYPH_FORMAT_BITMAP'. This lets you access */ | |
155 /* the bitmap's contents easily. */ | |
156 /* */ | |
157 /* The corresponding pixel buffer is always owned by @FT_BitmapGlyph */ | |
158 /* and is thus created and destroyed with it. */ | |
159 /* */ | |
160 typedef struct FT_BitmapGlyphRec_ | |
161 { | |
162 FT_GlyphRec root; | |
163 FT_Int left; | |
164 FT_Int top; | |
165 FT_Bitmap bitmap; | |
166 | |
167 } FT_BitmapGlyphRec; | |
168 | |
169 | |
170 /*************************************************************************/ | |
171 /* */ | |
172 /* <Type> */ | |
173 /* FT_OutlineGlyph */ | |
174 /* */ | |
175 /* <Description> */ | |
176 /* A handle to an object used to model an outline glyph image. This */ | |
177 /* is a sub-class of @FT_Glyph, and a pointer to @FT_OutlineGlyphRec. */ | |
178 /* */ | |
179 typedef struct FT_OutlineGlyphRec_* FT_OutlineGlyph; | |
180 | |
181 | |
182 /*************************************************************************/ | |
183 /* */ | |
184 /* <Struct> */ | |
185 /* FT_OutlineGlyphRec */ | |
186 /* */ | |
187 /* <Description> */ | |
188 /* A structure used for outline (vectorial) glyph images. This */ | |
189 /* really is a `sub-class' of @FT_GlyphRec. */ | |
190 /* */ | |
191 /* <Fields> */ | |
192 /* root :: The root @FT_Glyph fields. */ | |
193 /* */ | |
194 /* outline :: A descriptor for the outline. */ | |
195 /* */ | |
196 /* <Note> */ | |
197 /* You can typecast an @FT_Glyph to @FT_OutlineGlyph if you have */ | |
198 /* `glyph->format == FT_GLYPH_FORMAT_OUTLINE'. This lets you access */ | |
199 /* the outline's content easily. */ | |
200 /* */ | |
201 /* As the outline is extracted from a glyph slot, its coordinates are */ | |
202 /* expressed normally in 26.6 pixels, unless the flag */ | |
203 /* @FT_LOAD_NO_SCALE was used in @FT_Load_Glyph() or @FT_Load_Char(). */ | |
204 /* */ | |
205 /* The outline's tables are always owned by the object and are */ | |
206 /* destroyed with it. */ | |
207 /* */ | |
208 typedef struct FT_OutlineGlyphRec_ | |
209 { | |
210 FT_GlyphRec root; | |
211 FT_Outline outline; | |
212 | |
213 } FT_OutlineGlyphRec; | |
214 | |
215 | |
216 /*************************************************************************/ | |
217 /* */ | |
218 /* <Function> */ | |
219 /* FT_Get_Glyph */ | |
220 /* */ | |
221 /* <Description> */ | |
222 /* A function used to extract a glyph image from a slot. Note that */ | |
223 /* the created @FT_Glyph object must be released with @FT_Done_Glyph. */ | |
224 /* */ | |
225 /* <Input> */ | |
226 /* slot :: A handle to the source glyph slot. */ | |
227 /* */ | |
228 /* <Output> */ | |
229 /* aglyph :: A handle to the glyph object. */ | |
230 /* */ | |
231 /* <Return> */ | |
232 /* FreeType error code. 0~means success. */ | |
233 /* */ | |
234 FT_EXPORT( FT_Error ) | |
235 FT_Get_Glyph( FT_GlyphSlot slot, | |
236 FT_Glyph *aglyph ); | |
237 | |
238 | |
239 /*************************************************************************/ | |
240 /* */ | |
241 /* <Function> */ | |
242 /* FT_Glyph_Copy */ | |
243 /* */ | |
244 /* <Description> */ | |
245 /* A function used to copy a glyph image. Note that the created */ | |
246 /* @FT_Glyph object must be released with @FT_Done_Glyph. */ | |
247 /* */ | |
248 /* <Input> */ | |
249 /* source :: A handle to the source glyph object. */ | |
250 /* */ | |
251 /* <Output> */ | |
252 /* target :: A handle to the target glyph object. 0~in case of */ | |
253 /* error. */ | |
254 /* */ | |
255 /* <Return> */ | |
256 /* FreeType error code. 0~means success. */ | |
257 /* */ | |
258 FT_EXPORT( FT_Error ) | |
259 FT_Glyph_Copy( FT_Glyph source, | |
260 FT_Glyph *target ); | |
261 | |
262 | |
263 /*************************************************************************/ | |
264 /* */ | |
265 /* <Function> */ | |
266 /* FT_Glyph_Transform */ | |
267 /* */ | |
268 /* <Description> */ | |
269 /* Transform a glyph image if its format is scalable. */ | |
270 /* */ | |
271 /* <InOut> */ | |
272 /* glyph :: A handle to the target glyph object. */ | |
273 /* */ | |
274 /* <Input> */ | |
275 /* matrix :: A pointer to a 2x2 matrix to apply. */ | |
276 /* */ | |
277 /* delta :: A pointer to a 2d vector to apply. Coordinates are */ | |
278 /* expressed in 1/64th of a pixel. */ | |
279 /* */ | |
280 /* <Return> */ | |
281 /* FreeType error code (if not 0, the glyph format is not scalable). */ | |
282 /* */ | |
283 /* <Note> */ | |
284 /* The 2x2 transformation matrix is also applied to the glyph's */ | |
285 /* advance vector. */ | |
286 /* */ | |
287 FT_EXPORT( FT_Error ) | |
288 FT_Glyph_Transform( FT_Glyph glyph, | |
289 FT_Matrix* matrix, | |
290 FT_Vector* delta ); | |
291 | |
292 | |
293 /*************************************************************************/ | |
294 /* */ | |
295 /* <Enum> */ | |
296 /* FT_Glyph_BBox_Mode */ | |
297 /* */ | |
298 /* <Description> */ | |
299 /* The mode how the values of @FT_Glyph_Get_CBox are returned. */ | |
300 /* */ | |
301 /* <Values> */ | |
302 /* FT_GLYPH_BBOX_UNSCALED :: */ | |
303 /* Return unscaled font units. */ | |
304 /* */ | |
305 /* FT_GLYPH_BBOX_SUBPIXELS :: */ | |
306 /* Return unfitted 26.6 coordinates. */ | |
307 /* */ | |
308 /* FT_GLYPH_BBOX_GRIDFIT :: */ | |
309 /* Return grid-fitted 26.6 coordinates. */ | |
310 /* */ | |
311 /* FT_GLYPH_BBOX_TRUNCATE :: */ | |
312 /* Return coordinates in integer pixels. */ | |
313 /* */ | |
314 /* FT_GLYPH_BBOX_PIXELS :: */ | |
315 /* Return grid-fitted pixel coordinates. */ | |
316 /* */ | |
317 typedef enum FT_Glyph_BBox_Mode_ | |
318 { | |
319 FT_GLYPH_BBOX_UNSCALED = 0, | |
320 FT_GLYPH_BBOX_SUBPIXELS = 0, | |
321 FT_GLYPH_BBOX_GRIDFIT = 1, | |
322 FT_GLYPH_BBOX_TRUNCATE = 2, | |
323 FT_GLYPH_BBOX_PIXELS = 3 | |
324 | |
325 } FT_Glyph_BBox_Mode; | |
326 | |
327 | |
328 /*************************************************************************/ | |
329 /* */ | |
330 /* <Enum> */ | |
331 /* ft_glyph_bbox_xxx */ | |
332 /* */ | |
333 /* <Description> */ | |
334 /* These constants are deprecated. Use the corresponding */ | |
335 /* @FT_Glyph_BBox_Mode values instead. */ | |
336 /* */ | |
337 /* <Values> */ | |
338 /* ft_glyph_bbox_unscaled :: See @FT_GLYPH_BBOX_UNSCALED. */ | |
339 /* ft_glyph_bbox_subpixels :: See @FT_GLYPH_BBOX_SUBPIXELS. */ | |
340 /* ft_glyph_bbox_gridfit :: See @FT_GLYPH_BBOX_GRIDFIT. */ | |
341 /* ft_glyph_bbox_truncate :: See @FT_GLYPH_BBOX_TRUNCATE. */ | |
342 /* ft_glyph_bbox_pixels :: See @FT_GLYPH_BBOX_PIXELS. */ | |
343 /* */ | |
344 #define ft_glyph_bbox_unscaled FT_GLYPH_BBOX_UNSCALED | |
345 #define ft_glyph_bbox_subpixels FT_GLYPH_BBOX_SUBPIXELS | |
346 #define ft_glyph_bbox_gridfit FT_GLYPH_BBOX_GRIDFIT | |
347 #define ft_glyph_bbox_truncate FT_GLYPH_BBOX_TRUNCATE | |
348 #define ft_glyph_bbox_pixels FT_GLYPH_BBOX_PIXELS | |
349 | |
350 | |
351 /*************************************************************************/ | |
352 /* */ | |
353 /* <Function> */ | |
354 /* FT_Glyph_Get_CBox */ | |
355 /* */ | |
356 /* <Description> */ | |
357 /* Return a glyph's `control box'. The control box encloses all the */ | |
358 /* outline's points, including Bézier control points. Though it */ | |
359 /* coincides with the exact bounding box for most glyphs, it can be */ | |
360 /* slightly larger in some situations (like when rotating an outline */ | |
361 /* which contains Bézier outside arcs). */ | |
362 /* */ | |
363 /* Computing the control box is very fast, while getting the bounding */ | |
364 /* box can take much more time as it needs to walk over all segments */ | |
365 /* and arcs in the outline. To get the latter, you can use the */ | |
366 /* `ftbbox' component which is dedicated to this single task. */ | |
367 /* */ | |
368 /* <Input> */ | |
369 /* glyph :: A handle to the source glyph object. */ | |
370 /* */ | |
371 /* mode :: The mode which indicates how to interpret the returned */ | |
372 /* bounding box values. */ | |
373 /* */ | |
374 /* <Output> */ | |
375 /* acbox :: The glyph coordinate bounding box. Coordinates are */ | |
376 /* expressed in 1/64th of pixels if it is grid-fitted. */ | |
377 /* */ | |
378 /* <Note> */ | |
379 /* Coordinates are relative to the glyph origin, using the y~upwards */ | |
380 /* convention. */ | |
381 /* */ | |
382 /* If the glyph has been loaded with @FT_LOAD_NO_SCALE, `bbox_mode' */ | |
383 /* must be set to @FT_GLYPH_BBOX_UNSCALED to get unscaled font */ | |
384 /* units in 26.6 pixel format. The value @FT_GLYPH_BBOX_SUBPIXELS */ | |
385 /* is another name for this constant. */ | |
386 /* */ | |
387 /* If the font is tricky and the glyph has been loaded with */ | |
388 /* @FT_LOAD_NO_SCALE, the resulting CBox is meaningless. To get */ | |
389 /* reasonable values for the CBox it is necessary to load the glyph */ | |
390 /* at a large ppem value (so that the hinting instructions can */ | |
391 /* properly shift and scale the subglyphs), then extracting the CBox */ | |
392 /* which can be eventually converted back to font units. */ | |
393 /* */ | |
394 /* Note that the maximum coordinates are exclusive, which means that */ | |
395 /* one can compute the width and height of the glyph image (be it in */ | |
396 /* integer or 26.6 pixels) as: */ | |
397 /* */ | |
398 /* { */ | |
399 /* width = bbox.xMax - bbox.xMin; */ | |
400 /* height = bbox.yMax - bbox.yMin; */ | |
401 /* } */ | |
402 /* */ | |
403 /* Note also that for 26.6 coordinates, if `bbox_mode' is set to */ | |
404 /* @FT_GLYPH_BBOX_GRIDFIT, the coordinates will also be grid-fitted, */ | |
405 /* which corresponds to: */ | |
406 /* */ | |
407 /* { */ | |
408 /* bbox.xMin = FLOOR(bbox.xMin); */ | |
409 /* bbox.yMin = FLOOR(bbox.yMin); */ | |
410 /* bbox.xMax = CEILING(bbox.xMax); */ | |
411 /* bbox.yMax = CEILING(bbox.yMax); */ | |
412 /* } */ | |
413 /* */ | |
414 /* To get the bbox in pixel coordinates, set `bbox_mode' to */ | |
415 /* @FT_GLYPH_BBOX_TRUNCATE. */ | |
416 /* */ | |
417 /* To get the bbox in grid-fitted pixel coordinates, set `bbox_mode' */ | |
418 /* to @FT_GLYPH_BBOX_PIXELS. */ | |
419 /* */ | |
420 FT_EXPORT( void ) | |
421 FT_Glyph_Get_CBox( FT_Glyph glyph, | |
422 FT_UInt bbox_mode, | |
423 FT_BBox *acbox ); | |
424 | |
425 | |
426 /*************************************************************************/ | |
427 /* */ | |
428 /* <Function> */ | |
429 /* FT_Glyph_To_Bitmap */ | |
430 /* */ | |
431 /* <Description> */ | |
432 /* Convert a given glyph object to a bitmap glyph object. */ | |
433 /* */ | |
434 /* <InOut> */ | |
435 /* the_glyph :: A pointer to a handle to the target glyph. */ | |
436 /* */ | |
437 /* <Input> */ | |
438 /* render_mode :: An enumeration that describes how the data is */ | |
439 /* rendered. */ | |
440 /* */ | |
441 /* origin :: A pointer to a vector used to translate the glyph */ | |
442 /* image before rendering. Can be~0 (if no */ | |
443 /* translation). The origin is expressed in */ | |
444 /* 26.6 pixels. */ | |
445 /* */ | |
446 /* destroy :: A boolean that indicates that the original glyph */ | |
447 /* image should be destroyed by this function. It is */ | |
448 /* never destroyed in case of error. */ | |
449 /* */ | |
450 /* <Return> */ | |
451 /* FreeType error code. 0~means success. */ | |
452 /* */ | |
453 /* <Note> */ | |
454 /* This function does nothing if the glyph format isn't scalable. */ | |
455 /* */ | |
456 /* The glyph image is translated with the `origin' vector before */ | |
457 /* rendering. */ | |
458 /* */ | |
459 /* The first parameter is a pointer to an @FT_Glyph handle, that will */ | |
460 /* be _replaced_ by this function (with newly allocated data). */ | |
461 /* Typically, you would use (omitting error handling): */ | |
462 /* */ | |
463 /* */ | |
464 /* { */ | |
465 /* FT_Glyph glyph; */ | |
466 /* FT_BitmapGlyph glyph_bitmap; */ | |
467 /* */ | |
468 /* */ | |
469 /* // load glyph */ | |
470 /* error = FT_Load_Char( face, glyph_index, FT_LOAD_DEFAUT ); */ | |
471 /* */ | |
472 /* // extract glyph image */ | |
473 /* error = FT_Get_Glyph( face->glyph, &glyph ); */ | |
474 /* */ | |
475 /* // convert to a bitmap (default render mode + destroying old) */ | |
476 /* if ( glyph->format != FT_GLYPH_FORMAT_BITMAP ) */ | |
477 /* { */ | |
478 /* error = FT_Glyph_To_Bitmap( &glyph, FT_RENDER_MODE_NORMAL, */ | |
479 /* 0, 1 ); */ | |
480 /* if ( error ) // `glyph' unchanged */ | |
481 /* ... */ | |
482 /* } */ | |
483 /* */ | |
484 /* // access bitmap content by typecasting */ | |
485 /* glyph_bitmap = (FT_BitmapGlyph)glyph; */ | |
486 /* */ | |
487 /* // do funny stuff with it, like blitting/drawing */ | |
488 /* ... */ | |
489 /* */ | |
490 /* // discard glyph image (bitmap or not) */ | |
491 /* FT_Done_Glyph( glyph ); */ | |
492 /* } */ | |
493 /* */ | |
494 /* */ | |
495 /* Here another example, again without error handling: */ | |
496 /* */ | |
497 /* */ | |
498 /* { */ | |
499 /* FT_Glyph glyphs[MAX_GLYPHS] */ | |
500 /* */ | |
501 /* */ | |
502 /* ... */ | |
503 /* */ | |
504 /* for ( idx = 0; i < MAX_GLYPHS; i++ ) */ | |
505 /* error = FT_Load_Glyph( face, idx, FT_LOAD_DEFAULT ) || */ | |
506 /* FT_Get_Glyph ( face->glyph, &glyph[idx] ); */ | |
507 /* */ | |
508 /* ... */ | |
509 /* */ | |
510 /* for ( idx = 0; i < MAX_GLYPHS; i++ ) */ | |
511 /* { */ | |
512 /* FT_Glyph bitmap = glyphs[idx]; */ | |
513 /* */ | |
514 /* */ | |
515 /* ... */ | |
516 /* */ | |
517 /* // after this call, `bitmap' no longer points into */ | |
518 /* // the `glyphs' array (and the old value isn't destroyed) */ | |
519 /* FT_Glyph_To_Bitmap( &bitmap, FT_RENDER_MODE_MONO, 0, 0 ); */ | |
520 /* */ | |
521 /* ... */ | |
522 /* */ | |
523 /* FT_Done_Glyph( bitmap ); */ | |
524 /* } */ | |
525 /* */ | |
526 /* ... */ | |
527 /* */ | |
528 /* for ( idx = 0; i < MAX_GLYPHS; i++ ) */ | |
529 /* FT_Done_Glyph( glyphs[idx] ); */ | |
530 /* } */ | |
531 /* */ | |
532 FT_EXPORT( FT_Error ) | |
533 FT_Glyph_To_Bitmap( FT_Glyph* the_glyph, | |
534 FT_Render_Mode render_mode, | |
535 FT_Vector* origin, | |
536 FT_Bool destroy ); | |
537 | |
538 | |
539 /*************************************************************************/ | |
540 /* */ | |
541 /* <Function> */ | |
542 /* FT_Done_Glyph */ | |
543 /* */ | |
544 /* <Description> */ | |
545 /* Destroy a given glyph. */ | |
546 /* */ | |
547 /* <Input> */ | |
548 /* glyph :: A handle to the target glyph object. */ | |
549 /* */ | |
550 FT_EXPORT( void ) | |
551 FT_Done_Glyph( FT_Glyph glyph ); | |
552 | |
553 /* */ | |
554 | |
555 | |
556 /* other helpful functions */ | |
557 | |
558 /*************************************************************************/ | |
559 /* */ | |
560 /* <Section> */ | |
561 /* computations */ | |
562 /* */ | |
563 /*************************************************************************/ | |
564 | |
565 | |
566 /*************************************************************************/ | |
567 /* */ | |
568 /* <Function> */ | |
569 /* FT_Matrix_Multiply */ | |
570 /* */ | |
571 /* <Description> */ | |
572 /* Perform the matrix operation `b = a*b'. */ | |
573 /* */ | |
574 /* <Input> */ | |
575 /* a :: A pointer to matrix `a'. */ | |
576 /* */ | |
577 /* <InOut> */ | |
578 /* b :: A pointer to matrix `b'. */ | |
579 /* */ | |
580 /* <Note> */ | |
581 /* The result is undefined if either `a' or `b' is zero. */ | |
582 /* */ | |
583 FT_EXPORT( void ) | |
584 FT_Matrix_Multiply( const FT_Matrix* a, | |
585 FT_Matrix* b ); | |
586 | |
587 | |
588 /*************************************************************************/ | |
589 /* */ | |
590 /* <Function> */ | |
591 /* FT_Matrix_Invert */ | |
592 /* */ | |
593 /* <Description> */ | |
594 /* Invert a 2x2 matrix. Return an error if it can't be inverted. */ | |
595 /* */ | |
596 /* <InOut> */ | |
597 /* matrix :: A pointer to the target matrix. Remains untouched in */ | |
598 /* case of error. */ | |
599 /* */ | |
600 /* <Return> */ | |
601 /* FreeType error code. 0~means success. */ | |
602 /* */ | |
603 FT_EXPORT( FT_Error ) | |
604 FT_Matrix_Invert( FT_Matrix* matrix ); | |
605 | |
606 | |
607 /* */ | |
608 | |
609 | |
610 FT_END_HEADER | |
611 | |
612 #endif /* __FTGLYPH_H__ */ | |
613 | |
614 | |
615 /* END */ | |
616 | |
617 | |
618 /* Local Variables: */ | |
619 /* coding: utf-8 */ | |
620 /* End: */ | |
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