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[reactos.git] / lib / 3rdparty / freetype / src / autofit / afloader.c
1 /***************************************************************************/
2 /* */
3 /* afloader.c */
4 /* */
5 /* Auto-fitter glyph loading routines (body). */
6 /* */
7 /* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 by */
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
9 /* */
10 /* This file is part of the FreeType project, and may only be used, */
11 /* modified, and distributed under the terms of the FreeType project */
12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
13 /* this file you indicate that you have read the license and */
14 /* understand and accept it fully. */
15 /* */
16 /***************************************************************************/
17
18
19 #include "afloader.h"
20 #include "afhints.h"
21 #include "afglobal.h"
22 #include "aferrors.h"
23
24
25 FT_LOCAL_DEF( FT_Error )
26 af_loader_init( AF_Loader loader,
27 FT_Memory memory )
28 {
29 FT_ZERO( loader );
30
31 af_glyph_hints_init( &loader->hints, memory );
32 #ifdef AF_DEBUG
33 _af_debug_hints = &loader->hints;
34 #endif
35 return FT_GlyphLoader_New( memory, &loader->gloader );
36 }
37
38
39 FT_LOCAL_DEF( FT_Error )
40 af_loader_reset( AF_Loader loader,
41 FT_Face face )
42 {
43 FT_Error error = AF_Err_Ok;
44
45
46 loader->face = face;
47 loader->globals = (AF_FaceGlobals)face->autohint.data;
48
49 FT_GlyphLoader_Rewind( loader->gloader );
50
51 if ( loader->globals == NULL )
52 {
53 error = af_face_globals_new( face, &loader->globals );
54 if ( !error )
55 {
56 face->autohint.data =
57 (FT_Pointer)loader->globals;
58 face->autohint.finalizer =
59 (FT_Generic_Finalizer)af_face_globals_free;
60 }
61 }
62
63 return error;
64 }
65
66
67 FT_LOCAL_DEF( void )
68 af_loader_done( AF_Loader loader )
69 {
70 af_glyph_hints_done( &loader->hints );
71
72 loader->face = NULL;
73 loader->globals = NULL;
74
75 #ifdef AF_DEBUG
76 _af_debug_hints = NULL;
77 #endif
78 FT_GlyphLoader_Done( loader->gloader );
79 loader->gloader = NULL;
80 }
81
82
83 static FT_Error
84 af_loader_load_g( AF_Loader loader,
85 AF_Scaler scaler,
86 FT_UInt glyph_index,
87 FT_Int32 load_flags,
88 FT_UInt depth )
89 {
90 FT_Error error;
91 FT_Face face = loader->face;
92 FT_GlyphLoader gloader = loader->gloader;
93 AF_ScriptMetrics metrics = loader->metrics;
94 AF_GlyphHints hints = &loader->hints;
95 FT_GlyphSlot slot = face->glyph;
96 FT_Slot_Internal internal = slot->internal;
97
98
99 error = FT_Load_Glyph( face, glyph_index, load_flags );
100 if ( error )
101 goto Exit;
102
103 loader->transformed = internal->glyph_transformed;
104 if ( loader->transformed )
105 {
106 FT_Matrix inverse;
107
108
109 loader->trans_matrix = internal->glyph_matrix;
110 loader->trans_delta = internal->glyph_delta;
111
112 inverse = loader->trans_matrix;
113 FT_Matrix_Invert( &inverse );
114 FT_Vector_Transform( &loader->trans_delta, &inverse );
115 }
116
117 /* set linear metrics */
118 slot->linearHoriAdvance = slot->metrics.horiAdvance;
119 slot->linearVertAdvance = slot->metrics.vertAdvance;
120
121 switch ( slot->format )
122 {
123 case FT_GLYPH_FORMAT_OUTLINE:
124 /* translate the loaded glyph when an internal transform is needed */
125 if ( loader->transformed )
126 FT_Outline_Translate( &slot->outline,
127 loader->trans_delta.x,
128 loader->trans_delta.y );
129
130 /* copy the outline points in the loader's current */
131 /* extra points which is used to keep original glyph coordinates */
132 error = FT_GLYPHLOADER_CHECK_POINTS( gloader,
133 slot->outline.n_points + 4,
134 slot->outline.n_contours );
135 if ( error )
136 goto Exit;
137
138 FT_ARRAY_COPY( gloader->current.outline.points,
139 slot->outline.points,
140 slot->outline.n_points );
141
142 FT_ARRAY_COPY( gloader->current.outline.contours,
143 slot->outline.contours,
144 slot->outline.n_contours );
145
146 FT_ARRAY_COPY( gloader->current.outline.tags,
147 slot->outline.tags,
148 slot->outline.n_points );
149
150 gloader->current.outline.n_points = slot->outline.n_points;
151 gloader->current.outline.n_contours = slot->outline.n_contours;
152
153 /* compute original horizontal phantom points (and ignore */
154 /* vertical ones) */
155 loader->pp1.x = hints->x_delta;
156 loader->pp1.y = hints->y_delta;
157 loader->pp2.x = FT_MulFix( slot->metrics.horiAdvance,
158 hints->x_scale ) + hints->x_delta;
159 loader->pp2.y = hints->y_delta;
160
161 /* be sure to check for spacing glyphs */
162 if ( slot->outline.n_points == 0 )
163 goto Hint_Metrics;
164
165 /* now load the slot image into the auto-outline and run the */
166 /* automatic hinting process */
167 if ( metrics->clazz->script_hints_apply )
168 metrics->clazz->script_hints_apply( hints,
169 &gloader->current.outline,
170 metrics );
171
172 /* we now need to hint the metrics according to the change in */
173 /* width/positioning that occurred during the hinting process */
174 if ( scaler->render_mode != FT_RENDER_MODE_LIGHT )
175 {
176 FT_Pos old_rsb, old_lsb, new_lsb;
177 FT_Pos pp1x_uh, pp2x_uh;
178 AF_AxisHints axis = &hints->axis[AF_DIMENSION_HORZ];
179 AF_Edge edge1 = axis->edges; /* leftmost edge */
180 AF_Edge edge2 = edge1 +
181 axis->num_edges - 1; /* rightmost edge */
182
183
184 if ( axis->num_edges > 1 && AF_HINTS_DO_ADVANCE( hints ) )
185 {
186 old_rsb = loader->pp2.x - edge2->opos;
187 old_lsb = edge1->opos;
188 new_lsb = edge1->pos;
189
190 /* remember unhinted values to later account */
191 /* for rounding errors */
192
193 pp1x_uh = new_lsb - old_lsb;
194 pp2x_uh = edge2->pos + old_rsb;
195
196 /* prefer too much space over too little space */
197 /* for very small sizes */
198
199 if ( old_lsb < 24 )
200 pp1x_uh -= 8;
201
202 if ( old_rsb < 24 )
203 pp2x_uh += 8;
204
205 loader->pp1.x = FT_PIX_ROUND( pp1x_uh );
206 loader->pp2.x = FT_PIX_ROUND( pp2x_uh );
207
208 if ( loader->pp1.x >= new_lsb && old_lsb > 0 )
209 loader->pp1.x -= 64;
210
211 if ( loader->pp2.x <= edge2->pos && old_rsb > 0 )
212 loader->pp2.x += 64;
213
214 slot->lsb_delta = loader->pp1.x - pp1x_uh;
215 slot->rsb_delta = loader->pp2.x - pp2x_uh;
216 }
217 else
218 {
219 FT_Pos pp1x = loader->pp1.x;
220 FT_Pos pp2x = loader->pp2.x;
221
222
223 loader->pp1.x = FT_PIX_ROUND( pp1x );
224 loader->pp2.x = FT_PIX_ROUND( pp2x );
225
226 slot->lsb_delta = loader->pp1.x - pp1x;
227 slot->rsb_delta = loader->pp2.x - pp2x;
228 }
229 }
230 else
231 {
232 FT_Pos pp1x = loader->pp1.x;
233 FT_Pos pp2x = loader->pp2.x;
234
235
236 loader->pp1.x = FT_PIX_ROUND( pp1x + hints->xmin_delta );
237 loader->pp2.x = FT_PIX_ROUND( pp2x + hints->xmax_delta );
238
239 slot->lsb_delta = loader->pp1.x - pp1x;
240 slot->rsb_delta = loader->pp2.x - pp2x;
241 }
242
243 /* good, we simply add the glyph to our loader's base */
244 FT_GlyphLoader_Add( gloader );
245 break;
246
247 case FT_GLYPH_FORMAT_COMPOSITE:
248 {
249 FT_UInt nn, num_subglyphs = slot->num_subglyphs;
250 FT_UInt num_base_subgs, start_point;
251 FT_SubGlyph subglyph;
252
253
254 start_point = gloader->base.outline.n_points;
255
256 /* first of all, copy the subglyph descriptors in the glyph loader */
257 error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs );
258 if ( error )
259 goto Exit;
260
261 FT_ARRAY_COPY( gloader->current.subglyphs,
262 slot->subglyphs,
263 num_subglyphs );
264
265 gloader->current.num_subglyphs = num_subglyphs;
266 num_base_subgs = gloader->base.num_subglyphs;
267
268 /* now, read each subglyph independently */
269 for ( nn = 0; nn < num_subglyphs; nn++ )
270 {
271 FT_Vector pp1, pp2;
272 FT_Pos x, y;
273 FT_UInt num_points, num_new_points, num_base_points;
274
275
276 /* gloader.current.subglyphs can change during glyph loading due */
277 /* to re-allocation -- we must recompute the current subglyph on */
278 /* each iteration */
279 subglyph = gloader->base.subglyphs + num_base_subgs + nn;
280
281 pp1 = loader->pp1;
282 pp2 = loader->pp2;
283
284 num_base_points = gloader->base.outline.n_points;
285
286 error = af_loader_load_g( loader, scaler, subglyph->index,
287 load_flags, depth + 1 );
288 if ( error )
289 goto Exit;
290
291 /* recompute subglyph pointer */
292 subglyph = gloader->base.subglyphs + num_base_subgs + nn;
293
294 if ( subglyph->flags & FT_SUBGLYPH_FLAG_USE_MY_METRICS )
295 {
296 pp1 = loader->pp1;
297 pp2 = loader->pp2;
298 }
299 else
300 {
301 loader->pp1 = pp1;
302 loader->pp2 = pp2;
303 }
304
305 num_points = gloader->base.outline.n_points;
306 num_new_points = num_points - num_base_points;
307
308 /* now perform the transform required for this subglyph */
309
310 if ( subglyph->flags & ( FT_SUBGLYPH_FLAG_SCALE |
311 FT_SUBGLYPH_FLAG_XY_SCALE |
312 FT_SUBGLYPH_FLAG_2X2 ) )
313 {
314 FT_Vector* cur = gloader->base.outline.points +
315 num_base_points;
316 FT_Vector* limit = cur + num_new_points;
317
318
319 for ( ; cur < limit; cur++ )
320 FT_Vector_Transform( cur, &subglyph->transform );
321 }
322
323 /* apply offset */
324
325 if ( !( subglyph->flags & FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES ) )
326 {
327 FT_Int k = subglyph->arg1;
328 FT_UInt l = subglyph->arg2;
329 FT_Vector* p1;
330 FT_Vector* p2;
331
332
333 if ( start_point + k >= num_base_points ||
334 l >= (FT_UInt)num_new_points )
335 {
336 error = AF_Err_Invalid_Composite;
337 goto Exit;
338 }
339
340 l += num_base_points;
341
342 /* for now, only use the current point coordinates; */
343 /* we may consider another approach in the near future */
344 p1 = gloader->base.outline.points + start_point + k;
345 p2 = gloader->base.outline.points + start_point + l;
346
347 x = p1->x - p2->x;
348 y = p1->y - p2->y;
349 }
350 else
351 {
352 x = FT_MulFix( subglyph->arg1, hints->x_scale ) + hints->x_delta;
353 y = FT_MulFix( subglyph->arg2, hints->y_scale ) + hints->y_delta;
354
355 x = FT_PIX_ROUND( x );
356 y = FT_PIX_ROUND( y );
357 }
358
359 {
360 FT_Outline dummy = gloader->base.outline;
361
362
363 dummy.points += num_base_points;
364 dummy.n_points = (short)num_new_points;
365
366 FT_Outline_Translate( &dummy, x, y );
367 }
368 }
369 }
370 break;
371
372 default:
373 /* we don't support other formats (yet?) */
374 error = AF_Err_Unimplemented_Feature;
375 }
376
377 Hint_Metrics:
378 if ( depth == 0 )
379 {
380 FT_BBox bbox;
381 FT_Vector vvector;
382
383
384 vvector.x = slot->metrics.vertBearingX - slot->metrics.horiBearingX;
385 vvector.y = slot->metrics.vertBearingY - slot->metrics.horiBearingY;
386 vvector.x = FT_MulFix( vvector.x, metrics->scaler.x_scale );
387 vvector.y = FT_MulFix( vvector.y, metrics->scaler.y_scale );
388
389 /* transform the hinted outline if needed */
390 if ( loader->transformed )
391 {
392 FT_Outline_Transform( &gloader->base.outline, &loader->trans_matrix );
393 FT_Vector_Transform( &vvector, &loader->trans_matrix );
394 }
395 #if 1
396 /* we must translate our final outline by -pp1.x and compute */
397 /* the new metrics */
398 if ( loader->pp1.x )
399 FT_Outline_Translate( &gloader->base.outline, -loader->pp1.x, 0 );
400 #endif
401 FT_Outline_Get_CBox( &gloader->base.outline, &bbox );
402
403 bbox.xMin = FT_PIX_FLOOR( bbox.xMin );
404 bbox.yMin = FT_PIX_FLOOR( bbox.yMin );
405 bbox.xMax = FT_PIX_CEIL( bbox.xMax );
406 bbox.yMax = FT_PIX_CEIL( bbox.yMax );
407
408 slot->metrics.width = bbox.xMax - bbox.xMin;
409 slot->metrics.height = bbox.yMax - bbox.yMin;
410 slot->metrics.horiBearingX = bbox.xMin;
411 slot->metrics.horiBearingY = bbox.yMax;
412
413 slot->metrics.vertBearingX = FT_PIX_FLOOR( bbox.xMin + vvector.x );
414 slot->metrics.vertBearingY = FT_PIX_FLOOR( bbox.yMax + vvector.y );
415
416 /* for mono-width fonts (like Andale, Courier, etc.) we need */
417 /* to keep the original rounded advance width; ditto for */
418 /* digits if all have the same advance width */
419 #if 0
420 if ( !FT_IS_FIXED_WIDTH( slot->face ) )
421 slot->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
422 else
423 slot->metrics.horiAdvance = FT_MulFix( slot->metrics.horiAdvance,
424 x_scale );
425 #else
426 if ( FT_IS_FIXED_WIDTH( slot->face ) ||
427 ( af_face_globals_is_digit( loader->globals, glyph_index ) &&
428 metrics->digits_have_same_width ) )
429 {
430 slot->metrics.horiAdvance = FT_MulFix( slot->metrics.horiAdvance,
431 metrics->scaler.x_scale );
432
433 /* Set delta values to 0. Otherwise code that uses them is */
434 /* going to ruin the fixed advance width. */
435 slot->lsb_delta = 0;
436 slot->rsb_delta = 0;
437 }
438 else
439 {
440 /* non-spacing glyphs must stay as-is */
441 if ( slot->metrics.horiAdvance )
442 slot->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
443 }
444 #endif
445
446 slot->metrics.vertAdvance = FT_MulFix( slot->metrics.vertAdvance,
447 metrics->scaler.y_scale );
448
449 slot->metrics.horiAdvance = FT_PIX_ROUND( slot->metrics.horiAdvance );
450 slot->metrics.vertAdvance = FT_PIX_ROUND( slot->metrics.vertAdvance );
451
452 /* now copy outline into glyph slot */
453 FT_GlyphLoader_Rewind( internal->loader );
454 error = FT_GlyphLoader_CopyPoints( internal->loader, gloader );
455 if ( error )
456 goto Exit;
457
458 slot->outline = internal->loader->base.outline;
459 slot->format = FT_GLYPH_FORMAT_OUTLINE;
460 }
461
462 #ifdef DEBUG_HINTER
463 af_debug_hinter = hinter;
464 #endif
465
466 Exit:
467 return error;
468 }
469
470
471 FT_LOCAL_DEF( FT_Error )
472 af_loader_load_glyph( AF_Loader loader,
473 FT_Face face,
474 FT_UInt gindex,
475 FT_UInt32 load_flags )
476 {
477 FT_Error error;
478 FT_Size size = face->size;
479 AF_ScalerRec scaler;
480
481
482 if ( !size )
483 return AF_Err_Invalid_Argument;
484
485 FT_ZERO( &scaler );
486
487 scaler.face = face;
488 scaler.x_scale = size->metrics.x_scale;
489 scaler.x_delta = 0; /* XXX: TODO: add support for sub-pixel hinting */
490 scaler.y_scale = size->metrics.y_scale;
491 scaler.y_delta = 0; /* XXX: TODO: add support for sub-pixel hinting */
492
493 scaler.render_mode = FT_LOAD_TARGET_MODE( load_flags );
494 scaler.flags = 0; /* XXX: fix this */
495
496 error = af_loader_reset( loader, face );
497 if ( !error )
498 {
499 AF_ScriptMetrics metrics;
500 FT_UInt options = 0;
501
502
503 #ifdef FT_OPTION_AUTOFIT2
504 /* XXX: undocumented hook to activate the latin2 hinter */
505 if ( load_flags & ( 1UL << 20 ) )
506 options = 2;
507 #endif
508
509 error = af_face_globals_get_metrics( loader->globals, gindex,
510 options, &metrics );
511 if ( !error )
512 {
513 loader->metrics = metrics;
514
515 if ( metrics->clazz->script_metrics_scale )
516 metrics->clazz->script_metrics_scale( metrics, &scaler );
517 else
518 metrics->scaler = scaler;
519
520 load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_IGNORE_TRANSFORM;
521 load_flags &= ~FT_LOAD_RENDER;
522
523 if ( metrics->clazz->script_hints_init )
524 {
525 error = metrics->clazz->script_hints_init( &loader->hints,
526 metrics );
527 if ( error )
528 goto Exit;
529 }
530
531 error = af_loader_load_g( loader, &scaler, gindex, load_flags, 0 );
532 }
533 }
534 Exit:
535 return error;
536 }
537
538
539 /* END */
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