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/src/freetype/src/autofit/afloader.c

https://bitbucket.org/cabalistic/ogredeps/
C | 554 lines | 369 code | 122 blank | 63 comment | 45 complexity | 56a7d131b2d6d7aad8f5a22deff16285 MD5 | raw file
  1/***************************************************************************/
  2/*                                                                         */
  3/*  afloader.c                                                             */
  4/*                                                                         */
  5/*    Auto-fitter glyph loading routines (body).                           */
  6/*                                                                         */
  7/*  Copyright 2003-2009, 2011-2012 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  /* Initialize glyph loader. */
 26
 27  FT_LOCAL_DEF( FT_Error )
 28  af_loader_init( AF_Loader  loader,
 29                  FT_Memory  memory )
 30  {
 31    FT_ZERO( loader );
 32
 33    af_glyph_hints_init( &loader->hints, memory );
 34#ifdef FT_DEBUG_AUTOFIT
 35    _af_debug_hints = &loader->hints;
 36#endif
 37    return FT_GlyphLoader_New( memory, &loader->gloader );
 38  }
 39
 40
 41  /* Reset glyph loader and compute globals if necessary. */
 42
 43  FT_LOCAL_DEF( FT_Error )
 44  af_loader_reset( AF_Loader  loader,
 45                   FT_Face    face )
 46  {
 47    FT_Error  error = AF_Err_Ok;
 48
 49
 50    loader->face    = face;
 51    loader->globals = (AF_FaceGlobals)face->autohint.data;
 52
 53    FT_GlyphLoader_Rewind( loader->gloader );
 54
 55    if ( loader->globals == NULL )
 56    {
 57      error = af_face_globals_new( face, &loader->globals );
 58      if ( !error )
 59      {
 60        face->autohint.data =
 61          (FT_Pointer)loader->globals;
 62        face->autohint.finalizer =
 63          (FT_Generic_Finalizer)af_face_globals_free;
 64      }
 65    }
 66
 67    return error;
 68  }
 69
 70
 71  /* Finalize glyph loader. */
 72
 73  FT_LOCAL_DEF( void )
 74  af_loader_done( AF_Loader  loader )
 75  {
 76    af_glyph_hints_done( &loader->hints );
 77
 78    loader->face    = NULL;
 79    loader->globals = NULL;
 80
 81#ifdef FT_DEBUG_AUTOFIT
 82    _af_debug_hints = NULL;
 83#endif
 84    FT_GlyphLoader_Done( loader->gloader );
 85    loader->gloader = NULL;
 86  }
 87
 88
 89  /* Load a single glyph component.  This routine calls itself */
 90  /* recursively, if necessary, and does the main work of      */
 91  /* `af_loader_load_glyph.'                                   */
 92
 93  static FT_Error
 94  af_loader_load_g( AF_Loader  loader,
 95                    AF_Scaler  scaler,
 96                    FT_UInt    glyph_index,
 97                    FT_Int32   load_flags,
 98                    FT_UInt    depth )
 99  {
100    FT_Error          error;
101    FT_Face           face     = loader->face;
102    FT_GlyphLoader    gloader  = loader->gloader;
103    AF_ScriptMetrics  metrics  = loader->metrics;
104    AF_GlyphHints     hints    = &loader->hints;
105    FT_GlyphSlot      slot     = face->glyph;
106    FT_Slot_Internal  internal = slot->internal;
107
108
109    error = FT_Load_Glyph( face, glyph_index, load_flags );
110    if ( error )
111      goto Exit;
112
113    loader->transformed = internal->glyph_transformed;
114    if ( loader->transformed )
115    {
116      FT_Matrix  inverse;
117
118
119      loader->trans_matrix = internal->glyph_matrix;
120      loader->trans_delta  = internal->glyph_delta;
121
122      inverse = loader->trans_matrix;
123      FT_Matrix_Invert( &inverse );
124      FT_Vector_Transform( &loader->trans_delta, &inverse );
125    }
126
127    /* set linear metrics */
128    slot->linearHoriAdvance = slot->metrics.horiAdvance;
129    slot->linearVertAdvance = slot->metrics.vertAdvance;
130
131    switch ( slot->format )
132    {
133    case FT_GLYPH_FORMAT_OUTLINE:
134      /* translate the loaded glyph when an internal transform is needed */
135      if ( loader->transformed )
136        FT_Outline_Translate( &slot->outline,
137                              loader->trans_delta.x,
138                              loader->trans_delta.y );
139
140      /* copy the outline points in the loader's current               */
141      /* extra points which is used to keep original glyph coordinates */
142      error = FT_GLYPHLOADER_CHECK_POINTS( gloader,
143                                           slot->outline.n_points + 4,
144                                           slot->outline.n_contours );
145      if ( error )
146        goto Exit;
147
148      FT_ARRAY_COPY( gloader->current.outline.points,
149                     slot->outline.points,
150                     slot->outline.n_points );
151
152      FT_ARRAY_COPY( gloader->current.outline.contours,
153                     slot->outline.contours,
154                     slot->outline.n_contours );
155
156      FT_ARRAY_COPY( gloader->current.outline.tags,
157                     slot->outline.tags,
158                     slot->outline.n_points );
159
160      gloader->current.outline.n_points   = slot->outline.n_points;
161      gloader->current.outline.n_contours = slot->outline.n_contours;
162
163      /* compute original horizontal phantom points (and ignore */
164      /* vertical ones)                                         */
165      loader->pp1.x = hints->x_delta;
166      loader->pp1.y = hints->y_delta;
167      loader->pp2.x = FT_MulFix( slot->metrics.horiAdvance,
168                                 hints->x_scale ) + hints->x_delta;
169      loader->pp2.y = hints->y_delta;
170
171      /* be sure to check for spacing glyphs */
172      if ( slot->outline.n_points == 0 )
173        goto Hint_Metrics;
174
175      /* now load the slot image into the auto-outline and run the */
176      /* automatic hinting process                                 */
177      if ( metrics->clazz->script_hints_apply )
178        metrics->clazz->script_hints_apply( hints,
179                                            &gloader->current.outline,
180                                            metrics );
181
182      /* we now need to adjust the metrics according to the change in */
183      /* width/positioning that occurred during the hinting process   */
184      if ( scaler->render_mode != FT_RENDER_MODE_LIGHT )
185      {
186        FT_Pos        old_rsb, old_lsb, new_lsb;
187        FT_Pos        pp1x_uh, pp2x_uh;
188        AF_AxisHints  axis  = &hints->axis[AF_DIMENSION_HORZ];
189        AF_Edge       edge1 = axis->edges;         /* leftmost edge  */
190        AF_Edge       edge2 = edge1 +
191                              axis->num_edges - 1; /* rightmost edge */
192
193
194        if ( axis->num_edges > 1 && AF_HINTS_DO_ADVANCE( hints ) )
195        {
196          old_rsb = loader->pp2.x - edge2->opos;
197          old_lsb = edge1->opos;
198          new_lsb = edge1->pos;
199
200          /* remember unhinted values to later account */
201          /* for rounding errors                       */
202
203          pp1x_uh = new_lsb    - old_lsb;
204          pp2x_uh = edge2->pos + old_rsb;
205
206          /* prefer too much space over too little space */
207          /* for very small sizes                        */
208
209          if ( old_lsb < 24 )
210            pp1x_uh -= 8;
211
212          if ( old_rsb < 24 )
213            pp2x_uh += 8;
214
215          loader->pp1.x = FT_PIX_ROUND( pp1x_uh );
216          loader->pp2.x = FT_PIX_ROUND( pp2x_uh );
217
218          if ( loader->pp1.x >= new_lsb && old_lsb > 0 )
219            loader->pp1.x -= 64;
220
221          if ( loader->pp2.x <= edge2->pos && old_rsb > 0 )
222            loader->pp2.x += 64;
223
224          slot->lsb_delta = loader->pp1.x - pp1x_uh;
225          slot->rsb_delta = loader->pp2.x - pp2x_uh;
226        }
227        else
228        {
229          FT_Pos  pp1x = loader->pp1.x;
230          FT_Pos  pp2x = loader->pp2.x;
231
232
233          loader->pp1.x = FT_PIX_ROUND( pp1x );
234          loader->pp2.x = FT_PIX_ROUND( pp2x );
235
236          slot->lsb_delta = loader->pp1.x - pp1x;
237          slot->rsb_delta = loader->pp2.x - pp2x;
238        }
239      }
240      else
241      {
242        FT_Pos  pp1x = loader->pp1.x;
243        FT_Pos  pp2x = loader->pp2.x;
244
245
246        loader->pp1.x = FT_PIX_ROUND( pp1x + hints->xmin_delta );
247        loader->pp2.x = FT_PIX_ROUND( pp2x + hints->xmax_delta );
248
249        slot->lsb_delta = loader->pp1.x - pp1x;
250        slot->rsb_delta = loader->pp2.x - pp2x;
251      }
252
253      /* good, we simply add the glyph to our loader's base */
254      FT_GlyphLoader_Add( gloader );
255      break;
256
257    case FT_GLYPH_FORMAT_COMPOSITE:
258      {
259        FT_UInt      nn, num_subglyphs = slot->num_subglyphs;
260        FT_UInt      num_base_subgs, start_point;
261        FT_SubGlyph  subglyph;
262
263
264        start_point = gloader->base.outline.n_points;
265
266        /* first of all, copy the subglyph descriptors in the glyph loader */
267        error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs );
268        if ( error )
269          goto Exit;
270
271        FT_ARRAY_COPY( gloader->current.subglyphs,
272                       slot->subglyphs,
273                       num_subglyphs );
274
275        gloader->current.num_subglyphs = num_subglyphs;
276        num_base_subgs                 = gloader->base.num_subglyphs;
277
278        /* now read each subglyph independently */
279        for ( nn = 0; nn < num_subglyphs; nn++ )
280        {
281          FT_Vector  pp1, pp2;
282          FT_Pos     x, y;
283          FT_UInt    num_points, num_new_points, num_base_points;
284
285
286          /* gloader.current.subglyphs can change during glyph loading due */
287          /* to re-allocation -- we must recompute the current subglyph on */
288          /* each iteration                                                */
289          subglyph = gloader->base.subglyphs + num_base_subgs + nn;
290
291          pp1 = loader->pp1;
292          pp2 = loader->pp2;
293
294          num_base_points = gloader->base.outline.n_points;
295
296          error = af_loader_load_g( loader, scaler, subglyph->index,
297                                    load_flags, depth + 1 );
298          if ( error )
299            goto Exit;
300
301          /* recompute subglyph pointer */
302          subglyph = gloader->base.subglyphs + num_base_subgs + nn;
303
304          if ( subglyph->flags & FT_SUBGLYPH_FLAG_USE_MY_METRICS )
305          {
306            pp1 = loader->pp1;
307            pp2 = loader->pp2;
308          }
309          else
310          {
311            loader->pp1 = pp1;
312            loader->pp2 = pp2;
313          }
314
315          num_points     = gloader->base.outline.n_points;
316          num_new_points = num_points - num_base_points;
317
318          /* now perform the transformation required for this subglyph */
319
320          if ( subglyph->flags & ( FT_SUBGLYPH_FLAG_SCALE    |
321                                   FT_SUBGLYPH_FLAG_XY_SCALE |
322                                   FT_SUBGLYPH_FLAG_2X2      ) )
323          {
324            FT_Vector*  cur   = gloader->base.outline.points +
325                                num_base_points;
326            FT_Vector*  limit = cur + num_new_points;
327
328
329            for ( ; cur < limit; cur++ )
330              FT_Vector_Transform( cur, &subglyph->transform );
331          }
332
333          /* apply offset */
334
335          if ( !( subglyph->flags & FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES ) )
336          {
337            FT_Int      k = subglyph->arg1;
338            FT_UInt     l = subglyph->arg2;
339            FT_Vector*  p1;
340            FT_Vector*  p2;
341
342
343            if ( start_point + k >= num_base_points         ||
344                               l >= (FT_UInt)num_new_points )
345            {
346              error = AF_Err_Invalid_Composite;
347              goto Exit;
348            }
349
350            l += num_base_points;
351
352            /* for now, only use the current point coordinates;    */
353            /* we may consider another approach in the near future */
354            p1 = gloader->base.outline.points + start_point + k;
355            p2 = gloader->base.outline.points + start_point + l;
356
357            x = p1->x - p2->x;
358            y = p1->y - p2->y;
359          }
360          else
361          {
362            x = FT_MulFix( subglyph->arg1, hints->x_scale ) + hints->x_delta;
363            y = FT_MulFix( subglyph->arg2, hints->y_scale ) + hints->y_delta;
364
365            x = FT_PIX_ROUND( x );
366            y = FT_PIX_ROUND( y );
367          }
368
369          {
370            FT_Outline  dummy = gloader->base.outline;
371
372
373            dummy.points  += num_base_points;
374            dummy.n_points = (short)num_new_points;
375
376            FT_Outline_Translate( &dummy, x, y );
377          }
378        }
379      }
380      break;
381
382    default:
383      /* we don't support other formats (yet?) */
384      error = AF_Err_Unimplemented_Feature;
385    }
386
387  Hint_Metrics:
388    if ( depth == 0 )
389    {
390      FT_BBox    bbox;
391      FT_Vector  vvector;
392
393
394      vvector.x = slot->metrics.vertBearingX - slot->metrics.horiBearingX;
395      vvector.y = slot->metrics.vertBearingY - slot->metrics.horiBearingY;
396      vvector.x = FT_MulFix( vvector.x, metrics->scaler.x_scale );
397      vvector.y = FT_MulFix( vvector.y, metrics->scaler.y_scale );
398
399      /* transform the hinted outline if needed */
400      if ( loader->transformed )
401      {
402        FT_Outline_Transform( &gloader->base.outline, &loader->trans_matrix );
403        FT_Vector_Transform( &vvector, &loader->trans_matrix );
404      }
405#if 1
406      /* we must translate our final outline by -pp1.x and compute */
407      /* the new metrics                                           */
408      if ( loader->pp1.x )
409        FT_Outline_Translate( &gloader->base.outline, -loader->pp1.x, 0 );
410#endif
411      FT_Outline_Get_CBox( &gloader->base.outline, &bbox );
412
413      bbox.xMin = FT_PIX_FLOOR( bbox.xMin );
414      bbox.yMin = FT_PIX_FLOOR( bbox.yMin );
415      bbox.xMax = FT_PIX_CEIL(  bbox.xMax );
416      bbox.yMax = FT_PIX_CEIL(  bbox.yMax );
417
418      slot->metrics.width        = bbox.xMax - bbox.xMin;
419      slot->metrics.height       = bbox.yMax - bbox.yMin;
420      slot->metrics.horiBearingX = bbox.xMin;
421      slot->metrics.horiBearingY = bbox.yMax;
422
423      slot->metrics.vertBearingX = FT_PIX_FLOOR( bbox.xMin + vvector.x );
424      slot->metrics.vertBearingY = FT_PIX_FLOOR( bbox.yMax + vvector.y );
425
426      /* for mono-width fonts (like Andale, Courier, etc.) we need */
427      /* to keep the original rounded advance width; ditto for     */
428      /* digits if all have the same advance width                 */
429#if 0
430      if ( !FT_IS_FIXED_WIDTH( slot->face ) )
431        slot->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
432      else
433        slot->metrics.horiAdvance = FT_MulFix( slot->metrics.horiAdvance,
434                                               x_scale );
435#else
436      if ( scaler->render_mode != FT_RENDER_MODE_LIGHT                      &&
437           ( FT_IS_FIXED_WIDTH( slot->face )                              ||
438             ( af_face_globals_is_digit( loader->globals, glyph_index ) &&
439               metrics->digits_have_same_width                          ) ) )
440      {
441        slot->metrics.horiAdvance = FT_MulFix( slot->metrics.horiAdvance,
442                                               metrics->scaler.x_scale );
443
444        /* Set delta values to 0.  Otherwise code that uses them is */
445        /* going to ruin the fixed advance width.                   */
446        slot->lsb_delta = 0;
447        slot->rsb_delta = 0;
448      }
449      else
450      {
451        /* non-spacing glyphs must stay as-is */
452        if ( slot->metrics.horiAdvance )
453          slot->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
454      }
455#endif
456
457      slot->metrics.vertAdvance = FT_MulFix( slot->metrics.vertAdvance,
458                                             metrics->scaler.y_scale );
459
460      slot->metrics.horiAdvance = FT_PIX_ROUND( slot->metrics.horiAdvance );
461      slot->metrics.vertAdvance = FT_PIX_ROUND( slot->metrics.vertAdvance );
462
463      /* now copy outline into glyph slot */
464      FT_GlyphLoader_Rewind( internal->loader );
465      error = FT_GlyphLoader_CopyPoints( internal->loader, gloader );
466      if ( error )
467        goto Exit;
468
469      /* reassign all outline fields except flags to protect them */
470      slot->outline.n_contours = internal->loader->base.outline.n_contours;
471      slot->outline.n_points   = internal->loader->base.outline.n_points;
472      slot->outline.points     = internal->loader->base.outline.points;
473      slot->outline.tags       = internal->loader->base.outline.tags;
474      slot->outline.contours   = internal->loader->base.outline.contours;
475
476      slot->format  = FT_GLYPH_FORMAT_OUTLINE;
477    }
478
479  Exit:
480    return error;
481  }
482
483
484  /* Load a glyph. */
485
486  FT_LOCAL_DEF( FT_Error )
487  af_loader_load_glyph( AF_Loader  loader,
488                        FT_Face    face,
489                        FT_UInt    gindex,
490                        FT_Int32   load_flags )
491  {
492    FT_Error      error;
493    FT_Size       size = face->size;
494    AF_ScalerRec  scaler;
495
496
497    if ( !size )
498      return AF_Err_Invalid_Argument;
499
500    FT_ZERO( &scaler );
501
502    scaler.face    = face;
503    scaler.x_scale = size->metrics.x_scale;
504    scaler.x_delta = 0;  /* XXX: TODO: add support for sub-pixel hinting */
505    scaler.y_scale = size->metrics.y_scale;
506    scaler.y_delta = 0;  /* XXX: TODO: add support for sub-pixel hinting */
507
508    scaler.render_mode = FT_LOAD_TARGET_MODE( load_flags );
509    scaler.flags       = 0;  /* XXX: fix this */
510
511    error = af_loader_reset( loader, face );
512    if ( !error )
513    {
514      AF_ScriptMetrics  metrics;
515      FT_UInt           options = 0;
516
517
518#ifdef FT_OPTION_AUTOFIT2
519      /* XXX: undocumented hook to activate the latin2 hinter */
520      if ( load_flags & ( 1UL << 20 ) )
521        options = 2;
522#endif
523
524      error = af_face_globals_get_metrics( loader->globals, gindex,
525                                           options, &metrics );
526      if ( !error )
527      {
528        loader->metrics = metrics;
529
530        if ( metrics->clazz->script_metrics_scale )
531          metrics->clazz->script_metrics_scale( metrics, &scaler );
532        else
533          metrics->scaler = scaler;
534
535        load_flags |=  FT_LOAD_NO_SCALE | FT_LOAD_IGNORE_TRANSFORM;
536        load_flags &= ~FT_LOAD_RENDER;
537
538        if ( metrics->clazz->script_hints_init )
539        {
540          error = metrics->clazz->script_hints_init( &loader->hints,
541                                                     metrics );
542          if ( error )
543            goto Exit;
544        }
545
546        error = af_loader_load_g( loader, &scaler, gindex, load_flags, 0 );
547      }
548    }
549  Exit:
550    return error;
551  }
552
553
554/* END */