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[wxWidgets.git] / src / freetype / base / ftglyph.c
1 /***************************************************************************/
2 /* */
3 /* ftglyph.c */
4 /* */
5 /* FreeType convenience functions to handle glyphs (body). */
6 /* */
7 /* Copyright 1996-2000 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 /* This file contains the definition of several convenience functions */
21 /* that can be used by client applications to easily retrieve glyph */
22 /* bitmaps and outlines from a given face. */
23 /* */
24 /* These functions should be optional if you are writing a font server */
25 /* or text layout engine on top of FreeType. However, they are pretty */
26 /* handy for many other simple uses of the library. */
27 /* */
28 /*************************************************************************/
29
30
31 #include <freetype/ftglyph.h>
32 #include <freetype/ftoutln.h>
33 #include <freetype/internal/ftobjs.h>
34
35
36 /*************************************************************************/
37 /* */
38 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
39 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
40 /* messages during execution. */
41 /* */
42 #undef FT_COMPONENT
43 #define FT_COMPONENT trace_glyph
44
45
46 /*************************************************************************/
47 /*************************************************************************/
48 /**** ****/
49 /**** Convenience functions ****/
50 /**** ****/
51 /*************************************************************************/
52 /*************************************************************************/
53
54
55 /*************************************************************************/
56 /* */
57 /* <Function> */
58 /* FT_Matrix_Multiply */
59 /* */
60 /* <Description> */
61 /* Performs the matrix operation `b = a*b'. */
62 /* */
63 /* <Input> */
64 /* a :: A pointer to matrix `a'. */
65 /* */
66 /* <InOut> */
67 /* b :: A pointer to matrix `b'. */
68 /* */
69 /* <MT-Note> */
70 /* Yes. */
71 /* */
72 /* <Note> */
73 /* The result is undefined if either `a' or `b' is zero. */
74 /* */
75 FT_EXPORT_FUNC( void ) FT_Matrix_Multiply( FT_Matrix* a,
76 FT_Matrix* b )
77 {
78 FT_Fixed xx, xy, yx, yy;
79
80
81 if ( !a || !b )
82 return;
83
84 xx = FT_MulFix( a->xx, b->xx ) + FT_MulFix( a->xy, b->yx );
85 xy = FT_MulFix( a->xx, b->xy ) + FT_MulFix( a->xy, b->yy );
86 yx = FT_MulFix( a->yx, b->xx ) + FT_MulFix( a->yy, b->yx );
87 yy = FT_MulFix( a->yx, b->xy ) + FT_MulFix( a->yy, b->yy );
88
89 b->xx = xx; b->xy = xy;
90 b->yx = yx; b->yy = yy;
91 }
92
93
94 /*************************************************************************/
95 /* */
96 /* <Function> */
97 /* FT_Matrix_Invert */
98 /* */
99 /* <Description> */
100 /* Inverts a 2x2 matrix. Returns an error if it can't be inverted. */
101 /* */
102 /* <InOut> */
103 /* matrix :: A pointer to the target matrix. Remains untouched in */
104 /* case of error. */
105 /* */
106 /* <Return> */
107 /* FreeType error code. 0 means success. */
108 /* */
109 /* <MT-Note> */
110 /* Yes. */
111 /* */
112 FT_EXPORT_FUNC( FT_Error ) FT_Matrix_Invert( FT_Matrix* matrix )
113 {
114 FT_Pos delta, xx, yy;
115
116
117 if ( !matrix )
118 return FT_Err_Invalid_Argument;
119
120 /* compute discriminant */
121 delta = FT_MulFix( matrix->xx, matrix->yy ) -
122 FT_MulFix( matrix->xy, matrix->yx );
123
124 if ( !delta )
125 return FT_Err_Invalid_Argument; /* matrix can't be inverted */
126
127 matrix->xy = - FT_DivFix( matrix->xy, delta );
128 matrix->yx = - FT_DivFix( matrix->yx, delta );
129
130 xx = matrix->xx;
131 yy = matrix->yy;
132
133 matrix->xx = FT_DivFix( yy, delta );
134 matrix->yy = FT_DivFix( xx, delta );
135
136 return FT_Err_Ok;
137 }
138
139
140 /*************************************************************************/
141 /*************************************************************************/
142 /**** ****/
143 /**** FT_BitmapGlyph support ****/
144 /**** ****/
145 /*************************************************************************/
146 /*************************************************************************/
147
148 static
149 FT_Error ft_bitmap_copy( FT_Memory memory,
150 FT_Bitmap* source,
151 FT_Bitmap* target )
152 {
153 FT_Error error;
154 FT_Int pitch = source->pitch;
155 FT_ULong size;
156
157
158 *target = *source;
159
160 if ( pitch < 0 )
161 pitch = -pitch;
162
163 size = (FT_ULong)( pitch * source->rows );
164
165 if ( !ALLOC( target->buffer, size ) )
166 MEM_Copy( source->buffer, target->buffer, size );
167
168 return error;
169 }
170
171
172 static
173 FT_Error ft_bitmap_glyph_init( FT_BitmapGlyph glyph,
174 FT_GlyphSlot slot )
175 {
176 FT_Error error = FT_Err_Ok;
177 FT_Library library = FT_GLYPH(glyph)->library;
178 FT_Memory memory = library->memory;
179
180
181 if ( slot->format != ft_glyph_format_bitmap )
182 {
183 error = FT_Err_Invalid_Glyph_Format;
184 goto Exit;
185 }
186
187 /* grab the bitmap in the slot - do lazy copying whenever possible */
188 glyph->bitmap = slot->bitmap;
189 glyph->left = slot->bitmap_left;
190 glyph->top = slot->bitmap_top;
191
192 if ( slot->flags & ft_glyph_own_bitmap )
193 slot->flags &= ~ft_glyph_own_bitmap;
194 else
195 {
196 /* copy the bitmap into a new buffer */
197 error = ft_bitmap_copy( memory, &slot->bitmap, &glyph->bitmap );
198 }
199
200 Exit:
201 return error;
202 }
203
204
205 static
206 FT_Error ft_bitmap_glyph_copy( FT_BitmapGlyph source,
207 FT_BitmapGlyph target )
208 {
209 FT_Memory memory = source->root.library->memory;
210
211
212 target->left = source->left;
213 target->top = source->top;
214
215 return ft_bitmap_copy( memory, &source->bitmap, &target->bitmap );
216 }
217
218
219 static
220 void ft_bitmap_glyph_done( FT_BitmapGlyph glyph )
221 {
222 FT_Memory memory = FT_GLYPH(glyph)->library->memory;
223
224
225 FREE( glyph->bitmap.buffer );
226 }
227
228
229 static
230 void ft_bitmap_glyph_bbox( FT_BitmapGlyph glyph,
231 FT_BBox* cbox )
232 {
233 cbox->xMin = glyph->left << 6;
234 cbox->xMax = cbox->xMin + ( glyph->bitmap.width << 6 );
235 cbox->yMax = glyph->top << 6;
236 cbox->yMin = cbox->xMax - ( glyph->bitmap.rows << 6 );
237 }
238
239
240 const FT_Glyph_Class ft_bitmap_glyph_class =
241 {
242 sizeof( FT_BitmapGlyphRec ),
243 ft_glyph_format_bitmap,
244
245 (FT_Glyph_Init_Func) ft_bitmap_glyph_init,
246 (FT_Glyph_Done_Func) ft_bitmap_glyph_done,
247 (FT_Glyph_Copy_Func) ft_bitmap_glyph_copy,
248 (FT_Glyph_Transform_Func)0,
249 (FT_Glyph_BBox_Func) ft_bitmap_glyph_bbox,
250 (FT_Glyph_Prepare_Func) 0
251 };
252
253
254 /*************************************************************************/
255 /*************************************************************************/
256 /**** ****/
257 /**** FT_OutlineGlyph support ****/
258 /**** ****/
259 /*************************************************************************/
260 /*************************************************************************/
261
262
263 static
264 FT_Error ft_outline_glyph_init( FT_OutlineGlyph glyph,
265 FT_GlyphSlot slot )
266 {
267 FT_Error error = FT_Err_Ok;
268 FT_Library library = FT_GLYPH(glyph)->library;
269 FT_Outline* source = &slot->outline;
270 FT_Outline* target = &glyph->outline;
271
272
273 /* check format in glyph slot */
274 if ( slot->format != ft_glyph_format_outline )
275 {
276 error = FT_Err_Invalid_Glyph_Format;
277 goto Exit;
278 }
279
280 /* allocate new outline */
281 error = FT_Outline_New( library, source->n_points, source->n_contours,
282 &glyph->outline );
283 if ( error )
284 goto Exit;
285
286 /* copy it */
287 MEM_Copy( target->points, source->points,
288 source->n_points * sizeof ( FT_Vector ) );
289
290 MEM_Copy( target->tags, source->tags,
291 source->n_points * sizeof ( FT_Byte ) );
292
293 MEM_Copy( target->contours, source->contours,
294 source->n_contours * sizeof ( FT_Short ) );
295
296 /* copy all flags, except the `ft_outline_owner' one */
297 target->flags = source->flags | ft_outline_owner;
298
299 Exit:
300 return error;
301 }
302
303
304 static
305 void ft_outline_glyph_done( FT_OutlineGlyph glyph )
306 {
307 FT_Outline_Done( FT_GLYPH( glyph )->library, &glyph->outline );
308 }
309
310
311 static
312 FT_Error ft_outline_glyph_copy( FT_OutlineGlyph source,
313 FT_OutlineGlyph target )
314 {
315 FT_Error error;
316 FT_Library library = FT_GLYPH( source )->library;
317
318
319 error = FT_Outline_New( library, source->outline.n_points,
320 source->outline.n_contours, &target->outline );
321 if ( !error )
322 FT_Outline_Copy( &source->outline, &target->outline );
323
324 return error;
325 }
326
327
328 static
329 void ft_outline_glyph_transform( FT_OutlineGlyph glyph,
330 FT_Matrix* matrix,
331 FT_Vector* delta )
332 {
333 if ( matrix )
334 FT_Outline_Transform( &glyph->outline, matrix );
335
336 if ( delta )
337 FT_Outline_Translate( &glyph->outline, delta->x, delta->y );
338 }
339
340
341 static
342 void ft_outline_glyph_bbox( FT_OutlineGlyph glyph,
343 FT_BBox* bbox )
344 {
345 FT_Outline_Get_CBox( &glyph->outline, bbox );
346 }
347
348
349 static
350 FT_Error ft_outline_glyph_prepare( FT_OutlineGlyph glyph,
351 FT_GlyphSlot slot )
352 {
353 slot->format = ft_glyph_format_outline;
354 slot->outline = glyph->outline;
355 slot->outline.flags &= ~ft_outline_owner;
356
357 return FT_Err_Ok;
358 }
359
360
361 const FT_Glyph_Class ft_outline_glyph_class =
362 {
363 sizeof( FT_OutlineGlyphRec ),
364 ft_glyph_format_outline,
365
366 (FT_Glyph_Init_Func) ft_outline_glyph_init,
367 (FT_Glyph_Done_Func) ft_outline_glyph_done,
368 (FT_Glyph_Copy_Func) ft_outline_glyph_copy,
369 (FT_Glyph_Transform_Func)ft_outline_glyph_transform,
370 (FT_Glyph_BBox_Func) ft_outline_glyph_bbox,
371 (FT_Glyph_Prepare_Func) ft_outline_glyph_prepare
372 };
373
374
375 /*************************************************************************/
376 /*************************************************************************/
377 /**** ****/
378 /**** FT_Glyph class and API ****/
379 /**** ****/
380 /*************************************************************************/
381 /*************************************************************************/
382
383 static
384 FT_Error ft_new_glyph( FT_Library library,
385 const FT_Glyph_Class* clazz,
386 FT_Glyph* aglyph )
387 {
388 FT_Memory memory = library->memory;
389 FT_Error error;
390 FT_Glyph glyph;
391
392
393 *aglyph = 0;
394
395 if ( !ALLOC( glyph, clazz->glyph_size ) )
396 {
397 glyph->library = library;
398 glyph->clazz = clazz;
399 glyph->format = clazz->glyph_format;
400
401 *aglyph = glyph;
402 }
403
404 return error;
405 }
406
407
408 /*************************************************************************/
409 /* */
410 /* <Function> */
411 /* FT_Glyph_Copy */
412 /* */
413 /* <Description> */
414 /* A function used to copy a glyph image. */
415 /* */
416 /* <Input> */
417 /* source :: A handle to the source glyph object. */
418 /* */
419 /* <Output> */
420 /* target :: A handle to the target glyph object. 0 in case of */
421 /* error. */
422 /* */
423 /* <Return> */
424 /* FreeType error code. 0 means success. */
425 /* */
426 FT_EXPORT_FUNC( FT_Error ) FT_Glyph_Copy( FT_Glyph source,
427 FT_Glyph* target )
428 {
429 FT_Glyph copy;
430 FT_Error error;
431 const FT_Glyph_Class* clazz;
432
433
434 /* check arguments */
435 if ( !target || !source || !source->clazz )
436 {
437 error = FT_Err_Invalid_Argument;
438 goto Exit;
439 }
440
441 *target = 0;
442
443 clazz = source->clazz;
444 error = ft_new_glyph( source->library, clazz, &copy );
445 if ( error )
446 goto Exit;
447
448 if ( clazz->glyph_copy )
449 error = clazz->glyph_copy( source, copy );
450
451 if ( error )
452 FT_Done_Glyph( copy );
453 else
454 *target = copy;
455
456 Exit:
457 return error;
458 }
459
460
461 /*************************************************************************/
462 /* */
463 /* <Function> */
464 /* FT_Get_Glyph */
465 /* */
466 /* <Description> */
467 /* A function used to extract a glyph image from a slot. */
468 /* */
469 /* <Input> */
470 /* slot :: A handle to the source glyph slot. */
471 /* */
472 /* <Output> */
473 /* aglyph :: A handle to the glyph object. */
474 /* */
475 /* <Return> */
476 /* FreeType error code. 0 means success. */
477 /* */
478 FT_EXPORT_FUNC( FT_Error ) FT_Get_Glyph( FT_GlyphSlot slot,
479 FT_Glyph* aglyph )
480 {
481 FT_Library library = slot->library;
482 FT_Error error;
483 FT_Glyph glyph;
484
485 const FT_Glyph_Class* clazz = 0;
486
487
488 if ( !slot )
489 return FT_Err_Invalid_Slot_Handle;
490
491 if ( !aglyph )
492 return FT_Err_Invalid_Argument;
493
494 /* if it is a bitmap, that's easy :-) */
495 if ( slot->format == ft_glyph_format_bitmap )
496 clazz = &ft_bitmap_glyph_class;
497
498 /* it it is an outline too */
499 else if ( slot->format == ft_glyph_format_outline )
500 clazz = &ft_outline_glyph_class;
501
502 else
503 {
504 /* try to find a renderer that supports the glyph image format */
505 FT_Renderer render = FT_Lookup_Renderer( library, slot->format, 0 );
506
507
508 if ( render )
509 clazz = &render->glyph_class;
510 }
511
512 if ( !clazz )
513 {
514 error = FT_Err_Invalid_Glyph_Format;
515 goto Exit;
516 }
517
518 /* create FT_Glyph object */
519 error = ft_new_glyph( library, clazz, &glyph );
520 if ( error )
521 goto Exit;
522
523 /* copy advance while converting it to 16.16 format */
524 glyph->advance.x = slot->advance.x << 10;
525 glyph->advance.y = slot->advance.y << 10;
526
527 /* now import the image from the glyph slot */
528 error = clazz->glyph_init( glyph, slot );
529
530 /* if an error occurred, destroy the glyph */
531 if ( error )
532 FT_Done_Glyph( glyph );
533 else
534 *aglyph = glyph;
535
536 Exit:
537 return error;
538 }
539
540
541 /*************************************************************************/
542 /* */
543 /* <Function> */
544 /* FT_Glyph_Transform */
545 /* */
546 /* <Description> */
547 /* Transforms a glyph image if its format is scalable. */
548 /* */
549 /* <Input> */
550 /* glyph :: A handle to the target glyph object. */
551 /* */
552 /* matrix :: A pointer to a 2x2 matrix to apply. */
553 /* */
554 /* delta :: A pointer to a 2d vector to apply. Coordinates are */
555 /* expressed in 1/64th of a pixel. */
556 /* */
557 /* <Return> */
558 /* FreeType error code (the glyph format is not scalable if it is */
559 /* not zero). */
560 /* */
561 /* <Note> */
562 /* The 2x2 transformation matrix is also applied to the glyph's */
563 /* advance vector. */
564 /* */
565 FT_EXPORT_FUNC( FT_Error ) FT_Glyph_Transform( FT_Glyph glyph,
566 FT_Matrix* matrix,
567 FT_Vector* delta )
568 {
569 const FT_Glyph_Class* clazz;
570 FT_Error error = FT_Err_Ok;
571
572
573 if ( !glyph || !glyph->clazz )
574 error = FT_Err_Invalid_Argument;
575 else
576 {
577 clazz = glyph->clazz;
578 if ( clazz->glyph_transform )
579 {
580 /* transform glyph image */
581 clazz->glyph_transform( glyph, matrix, delta );
582
583 /* transform advance vector */
584 if ( matrix )
585 FT_Vector_Transform( &glyph->advance, matrix );
586 }
587 else
588 error = FT_Err_Invalid_Glyph_Format;
589 }
590 return error;
591 }
592
593
594 /*************************************************************************/
595 /* */
596 /* <Function> */
597 /* FT_Glyph_Get_CBox */
598 /* */
599 /* <Description> */
600 /* Returns the glyph image's bounding box. */
601 /* */
602 /* <Input> */
603 /* glyph :: A handle to the source glyph object. */
604 /* */
605 /* mode :: A set of bit flags that indicate how to interpret the */
606 /* returned bounding box values. */
607 /* */
608 /* <Output> */
609 /* box :: The glyph bounding box. Coordinates are expressed in */
610 /* 1/64th of pixels if it is grid-fitted. */
611 /* */
612 /* <Note> */
613 /* Coordinates are relative to the glyph origin, using the Y-upwards */
614 /* convention. */
615 /* */
616 /* If `ft_glyph_bbox_subpixels' is set in `mode', the bbox */
617 /* coordinates are returned in 26.6 pixels (i.e. 1/64th of pixels). */
618 /* Otherwise, coordinates are expressed in integer pixels. */
619 /* */
620 /* Note that the maximum coordinates are exclusive, which means that */
621 /* one can compute the width and height of the glyph image (be it in */
622 /* integer or 26.6 pixels) as: */
623 /* */
624 /* width = bbox.xMax - bbox.xMin; */
625 /* height = bbox.yMax - bbox.yMin; */
626 /* */
627 /* Note also that for 26.6 coordinates, if the */
628 /* `ft_glyph_bbox_gridfit' flag is set in `mode;, the coordinates */
629 /* will also be grid-fitted, which corresponds to: */
630 /* */
631 /* bbox.xMin = FLOOR(bbox.xMin); */
632 /* bbox.yMin = FLOOR(bbox.yMin); */
633 /* bbox.xMax = CEILING(bbox.xMax); */
634 /* bbox.yMax = CEILING(bbox.yMax); */
635 /* */
636 /* The default value (0) for `bbox_mode' is `ft_glyph_bbox_pixels'. */
637 /* */
638 FT_EXPORT_FUNC( void ) FT_Glyph_Get_CBox( FT_Glyph glyph,
639 FT_UInt bbox_mode,
640 FT_BBox* cbox )
641 {
642 const FT_Glyph_Class* clazz;
643 FT_Error error = FT_Err_Ok;
644
645
646 if ( !cbox || !glyph || !glyph->clazz )
647 error = FT_Err_Invalid_Argument;
648 else
649 {
650 clazz = glyph->clazz;
651 if ( !clazz->glyph_bbox )
652 error = FT_Err_Invalid_Glyph_Format;
653 else
654 {
655 /* retrieve bbox in 26.6 coordinates */
656 clazz->glyph_bbox( glyph, cbox );
657
658 /* perform grid fitting if needed */
659 if ( bbox_mode & ft_glyph_bbox_gridfit )
660 {
661 cbox->xMin &= -64;
662 cbox->yMin &= -64;
663 cbox->xMax = ( cbox->xMax + 63 ) & -64;
664 cbox->yMax = ( cbox->yMax + 63 ) & -64;
665 }
666
667 /* convert to integer pixels if needed */
668 if ( !( bbox_mode & ft_glyph_bbox_subpixels ) )
669 {
670 cbox->xMin >>= 6;
671 cbox->yMin >>= 6;
672 cbox->xMax >>= 6;
673 cbox->yMax >>= 6;
674 }
675 }
676 }
677 return;
678 }
679
680
681 /*************************************************************************/
682 /* */
683 /* <Function> */
684 /* FT_Glyph_To_Bitmap */
685 /* */
686 /* <Description> */
687 /* Converts a given glyph object to a bitmap glyph object. */
688 /* */
689 /* <InOut> */
690 /* glyph :: A pointer to a handle to the target glyph. */
691 /* */
692 /* <Input> */
693 /* render_mode :: A set of bit flags that describe how the data is */
694 /* */
695 /* */
696 /* origin :: A pointer to a vector used to translate the glyph */
697 /* image before rendering. Can be 0 (if no */
698 /* translation). The origin is expressed in */
699 /* 26.6 pixels. */
700 /* */
701 /* destroy :: A boolean that indicates that the original glyph */
702 /* image should be destroyed by this function. It is */
703 /* never destroyed in case of error. */
704 /* */
705 /* <Return> */
706 /* FreeType error code. 0 means success. */
707 /* */
708 /* <Note> */
709 /* The glyph image is translated with the `origin' vector before */
710 /* rendering. In case of error, it it translated back to its */
711 /* original position and the glyph is left untouched. */
712 /* */
713 /* The first parameter is a pointer to a FT_Glyph handle, that will */
714 /* be replaced by this function. Typically, you would use (omitting */
715 /* error handling): */
716 /* */
717 /* */
718 /* { */
719 /* FT_Glyph glyph; */
720 /* FT_BitmapGlyph glyph_bitmap; */
721 /* */
722 /* */
723 /* // load glyph */
724 /* error = FT_Load_Char( face, glyph_index, FT_LOAD_DEFAUT ); */
725 /* */
726 /* // extract glyph image */
727 /* error = FT_Get_Glyph( face->glyph, &glyph ); */
728 /* */
729 /* // convert to a bitmap (default render mode + destroy old) */
730 /* if ( glyph->format != ft_glyph_format_bitmap ) */
731 /* { */
732 /* error = FT_Glyph_To_Bitmap( &glyph, ft_render_mode_default, */
733 /* 0, 1 ); */
734 /* if ( error ) // glyph unchanged */
735 /* ... */
736 /* } */
737 /* */
738 /* // access bitmap content by typecasting */
739 /* glyph_bitmap = (FT_BitmapGlyph)glyph; */
740 /* */
741 /* // do funny stuff with it, like blitting/drawing */
742 /* ... */
743 /* */
744 /* // discard glyph image (bitmap or not) */
745 /* FT_Done_Glyph( glyph ); */
746 /* } */
747 /* */
748 /* */
749 /* This function will always fail if the glyph's format isn't */
750 /* scalable. */
751 /* */
752 FT_EXPORT_FUNC( FT_Error ) FT_Glyph_To_Bitmap( FT_Glyph* the_glyph,
753 FT_ULong render_mode,
754 FT_Vector* origin,
755 FT_Bool destroy )
756 {
757 FT_GlyphSlotRec dummy;
758 FT_Error error;
759 FT_Glyph glyph;
760 FT_BitmapGlyph bitmap;
761
762 const FT_Glyph_Class* clazz;
763
764
765 /* check argument */
766 if ( !the_glyph )
767 goto Bad;
768
769 /* we render the glyph into a glyph bitmap using a `dummy' glyph slot */
770 /* then calling FT_Render_Glyph_Internal() */
771
772 glyph = *the_glyph;
773 if ( !glyph )
774 goto Bad;
775
776 clazz = glyph->clazz;
777 if ( !clazz || !clazz->glyph_prepare )
778 goto Bad;
779
780 MEM_Set( &dummy, 0, sizeof ( dummy ) );
781 dummy.library = glyph->library;
782 dummy.format = clazz->glyph_format;
783
784 /* if `origin' is set, translate the glyph image */
785 if ( origin )
786 FT_Glyph_Transform( glyph, 0, origin );
787
788 /* create result bitmap glyph */
789 error = ft_new_glyph( glyph->library, &ft_bitmap_glyph_class,
790 (FT_Glyph*)&bitmap );
791 if ( error )
792 goto Exit;
793
794 /* prepare dummy slot for rendering */
795 error = clazz->glyph_prepare( glyph, &dummy ) ||
796 FT_Render_Glyph_Internal( glyph->library, &dummy, render_mode );
797
798 if ( !destroy && origin )
799 {
800 FT_Vector v;
801
802
803 v.x = -origin->x;
804 v.y = -origin->y;
805 FT_Glyph_Transform( glyph, 0, &v );
806 }
807
808 /* in case of succes, copy the bitmap to the glyph bitmap */
809 if ( !error )
810 {
811 error = ft_bitmap_glyph_init( bitmap, &dummy );
812 if ( error )
813 {
814 /* this should never happen, but let's be safe */
815 FT_Done_Glyph( FT_GLYPH( bitmap ) );
816 goto Exit;
817 }
818
819 if ( destroy )
820 FT_Done_Glyph( glyph );
821
822 *the_glyph = FT_GLYPH( bitmap );
823 }
824
825 Exit:
826 return error;
827
828 Bad:
829 error = FT_Err_Invalid_Argument;
830 goto Exit;
831 }
832
833
834 /*************************************************************************/
835 /* */
836 /* <Function> */
837 /* FT_Done_Glyph */
838 /* */
839 /* <Description> */
840 /* Destroys a given glyph. */
841 /* */
842 /* <Input> */
843 /* glyph :: A handle to the target glyph object. */
844 /* */
845 FT_EXPORT_FUNC( void ) FT_Done_Glyph( FT_Glyph glyph )
846 {
847 if ( glyph )
848 {
849 FT_Memory memory = glyph->library->memory;
850 const FT_Glyph_Class* clazz = glyph->clazz;
851
852
853 if ( clazz->glyph_done )
854 clazz->glyph_done( glyph );
855
856 FREE( glyph );
857 }
858 }
859
860
861 #if 0
862
863 /*************************************************************************/
864 /*************************************************************************/
865 /**** ****/
866 /**** EXPERIMENTAL EMBOLDENING/OUTLINING SUPPORT ****/
867 /**** ****/
868 /*************************************************************************/
869 /*************************************************************************/
870
871 /* Compute the norm of a vector */
872
873 #ifdef FT_CONFIG_OPTION_OLD_CALCS
874
875 static
876 FT_Pos ft_norm( FT_Vector* vec )
877 {
878 FT_Int64 t1, t2;
879
880
881 MUL_64( vec->x, vec->x, t1 );
882 MUL_64( vec->y, vec->y, t2 );
883 ADD_64( t1, t2, t1 );
884
885 return (FT_Pos)SQRT_64( t1 );
886 }
887
888 #else /* FT_CONFIG_OPTION_OLD_CALCS */
889
890 static
891 FT_Pos ft_norm( FT_Vector* vec )
892 {
893 FT_F26Dot6 u, v, d;
894 FT_Int shift;
895 FT_ULong H, L, L2, hi, lo, med;
896
897
898 u = vec->x; if ( u < 0 ) u = -u;
899 v = vec->y; if ( v < 0 ) v = -v;
900
901 if ( u < v )
902 {
903 d = u;
904 u = v;
905 v = d;
906 }
907
908 /* check that we are not trying to normalize zero! */
909 if ( u == 0 )
910 return 0;
911
912 /* compute (u*u + v*v) on 64 bits with two 32-bit registers [H:L] */
913 hi = (FT_ULong)u >> 16;
914 lo = (FT_ULong)u & 0xFFFF;
915 med = hi * lo;
916
917 H = hi * hi + ( med >> 15 );
918 med <<= 17;
919 L = lo * lo + med;
920 if ( L < med )
921 H++;
922
923 hi = (FT_ULong)v >> 16;
924 lo = (FT_ULong)v & 0xFFFF;
925 med = hi * lo;
926
927 H += hi * hi + ( med >> 15 );
928 med <<= 17;
929 L2 = lo * lo + med;
930 if ( L2 < med )
931 H++;
932
933 L += L2;
934 if ( L < L2 )
935 H++;
936
937 /* if the value is smaller than 32 bits */
938 shift = 0;
939 if ( H == 0 )
940 {
941 while ( ( L & 0xC0000000UL ) == 0 )
942 {
943 L <<= 2;
944 shift++;
945 }
946 return ( FT_Sqrt32( L ) >> shift );
947 }
948 else
949 {
950 while ( H )
951 {
952 L = ( L >> 2 ) | ( H << 30 );
953 H >>= 2;
954 shift++;
955 }
956 return ( FT_Sqrt32( L ) << shift );
957 }
958 }
959
960 #endif /* FT_CONFIG_OPTION_OLD_CALCS */
961
962
963 static
964 int ft_test_extrema( FT_Outline* outline,
965 int n )
966 {
967 FT_Vector *prev, *cur, *next;
968 FT_Pos product;
969 FT_Int first, last;
970
971
972 /* we need to compute the `previous' and `next' point */
973 /* for these extrema. */
974 cur = outline->points + n;
975 prev = cur - 1;
976 next = cur + 1;
977
978 first = 0;
979 for ( c = 0; c < outline->n_contours; c++ )
980 {
981 last = outline->contours[c];
982
983 if ( n == first )
984 prev = outline->points + last;
985
986 if ( n == last )
987 next = outline->points + first;
988
989 first = last + 1;
990 }
991
992 product = FT_MulDiv( cur->x - prev->x, /* in.x */
993 next->y - cur->y, /* out.y */
994 0x40 )
995 -
996 FT_MulDiv( cur->y - prev->y, /* in.y */
997 next->x - cur->x, /* out.x */
998 0x40 );
999
1000 if ( product )
1001 product = product > 0 ? 1 : -1;
1002
1003 return product;
1004 }
1005
1006
1007 /* Compute the orientation of path filling. It differs between TrueType */
1008 /* and Type1 formats. We could use the `ft_outline_reverse_fill' flag, */
1009 /* but it is better to re-compute it directly (it seems that this flag */
1010 /* isn't correctly set for some weird composite glyphs currently). */
1011 /* */
1012 /* We do this by computing bounding box points, and computing their */
1013 /* curvature. */
1014 /* */
1015 /* The function returns either 1 or -1. */
1016 /* */
1017 static
1018 int ft_get_orientation( FT_Outline* outline )
1019 {
1020 FT_BBox box;
1021 FT_BBox indices;
1022 int n, last;
1023
1024
1025 indices.xMin = -1;
1026 indices.yMin = -1;
1027 indices.xMax = -1;
1028 indices.yMax = -1;
1029
1030 box.xMin = box.yMin = 32767;
1031 box.xMax = box.yMax = -32768;
1032
1033 /* is it empty ? */
1034 if ( outline->n_contours < 1 )
1035 return 1;
1036
1037 last = outline->contours[outline->n_contours - 1];
1038
1039 for ( n = 0; n <= last; n++ )
1040 {
1041 FT_Pos x, y;
1042
1043
1044 x = outline->points[n].x;
1045 if ( x < box.xMin )
1046 {
1047 box.xMin = x;
1048 indices.xMin = n;
1049 }
1050 if ( x > box.xMax )
1051 {
1052 box.xMax = x;
1053 indices.xMax = n;
1054 }
1055
1056 y = outline->points[n].y;
1057 if ( y < box.yMin )
1058 {
1059 box.yMin = y;
1060 indices.yMin = n;
1061 }
1062 if ( y > box.yMax )
1063 {
1064 box.yMax = y;
1065 indices.yMax = n;
1066 }
1067 }
1068
1069 /* test orientation of the xmin */
1070 return ft_test_extrema( outline, indices.xMin ) ||
1071 ft_test_extrema( outline, indices.yMin ) ||
1072 ft_test_extrema( outline, indices.xMax ) ||
1073 ft_test_extrema( outline, indices.yMax ) ||
1074 1; /* this is an empty glyph? */
1075 }
1076
1077
1078 static
1079 FT_Error ft_embolden( FT_Face original,
1080 FT_Outline* outline,
1081 FT_Pos* advance )
1082 {
1083 FT_Vector u, v;
1084 FT_Vector* points;
1085 FT_Vector cur, prev, next;
1086 FT_Pos distance;
1087 int c, n, first, orientation;
1088
1089 FT_UNUSED( advance );
1090
1091
1092 /* compute control distance */
1093 distance = FT_MulFix( original->em_size / 60,
1094 original->size->metrics.y_scale );
1095
1096 orientation = ft_get_orientation( &original->glyph->outline );
1097
1098 points = original->glyph->outline.points;
1099
1100 first = 0;
1101 for ( c = 0; c < outline->n_contours; c++ )
1102 {
1103 int last = outline->contours[c];
1104
1105
1106 prev = points[last];
1107
1108 for ( n = first; n <= last; n++ )
1109 {
1110 FT_Pos norm, delta, d;
1111 FT_Vector in, out;
1112
1113
1114 cur = points[n];
1115 if ( n < last ) next = points[n + 1];
1116 else next = points[first];
1117
1118 /* compute the in and out vectors */
1119 in.x = cur.x - prev.x;
1120 in.y = cur.y - prev.y;
1121
1122 out.x = next.x - cur.x;
1123 out.y = next.y - cur.y;
1124
1125 /* compute U and V */
1126 norm = ft_norm( &in );
1127 u.x = orientation * FT_DivFix( in.y, norm );
1128 u.y = orientation * -FT_DivFix( in.x, norm );
1129
1130 norm = ft_norm( &out );
1131 v.x = orientation * FT_DivFix( out.y, norm );
1132 v.y = orientation * -FT_DivFix( out.x, norm );
1133
1134 d = distance;
1135
1136 if ( ( outline->flags[n] & FT_Curve_Tag_On ) == 0 )
1137 d *= 2;
1138
1139 /* Check discriminant for parallel vectors */
1140 delta = FT_MulFix( u.x, v.y ) - FT_MulFix( u.y, v.x );
1141 if ( delta > FT_BOLD_THRESHOLD || delta < -FT_BOLD_THRESHOLD )
1142 {
1143 /* Move point -- compute A and B */
1144 FT_Pos x, y, A, B;
1145
1146
1147 A = d + FT_MulFix( cur.x, u.x ) + FT_MulFix( cur.y, u.y );
1148 B = d + FT_MulFix( cur.x, v.x ) + FT_MulFix( cur.y, v.y );
1149
1150 x = FT_MulFix( A, v.y ) - FT_MulFix( B, u.y );
1151 y = FT_MulFix( B, u.x ) - FT_MulFix( A, v.x );
1152
1153 outline->points[n].x = distance + FT_DivFix( x, delta );
1154 outline->points[n].y = distance + FT_DivFix( y, delta );
1155 }
1156 else
1157 {
1158 /* Vectors are nearly parallel */
1159 FT_Pos x, y;
1160
1161
1162 x = distance + cur.x + FT_MulFix( d, u.x + v.x ) / 2;
1163 y = distance + cur.y + FT_MulFix( d, u.y + v.y ) / 2;
1164
1165 outline->points[n].x = x;
1166 outline->points[n].y = y;
1167 }
1168
1169 prev = cur;
1170 }
1171
1172 first = last + 1;
1173 }
1174
1175 if ( advance )
1176 *advance = ( *advance + distance * 4 ) & -64;
1177
1178 return 0;
1179 }
1180
1181 #endif /* 0 -- EXPERIMENTAL STUFF! */
1182
1183
1184 /* END */
wxWidgets (Impactor)