1 /***************************************************************************/
5 /* Glyph hinter (body). */
7 /* Copyright 2000 Catharon Productions Inc. */
8 /* Author: David Turner */
10 /* This file is part of the Catharon Typography Project and shall only */
11 /* be used, modified, and distributed under the terms of the Catharon */
12 /* Open Source License that should come with this file under the name */
13 /* `CatharonLicense.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. */
17 /* Note that this license is compatible with the FreeType license. */
19 /***************************************************************************/
22 #ifdef FT_FLAT_COMPILE
30 #include <freetype/src/autohint/ahhint.h>
31 #include <freetype/src/autohint/ahglyph.h>
32 #include <freetype/src/autohint/ahangles.h>
36 #include <freetype/ftoutln.h>
39 #define FACE_GLOBALS( face ) ((AH_Face_Globals*)(face)->autohint.data)
44 /*************************************************************************/
45 /*************************************************************************/
47 /**** Hinting routines ****/
49 /*************************************************************************/
50 /*************************************************************************/
53 static int disable_horz_edges = 0;
54 static int disable_vert_edges = 0;
57 /* snap a given width in scaled coordinates to one of the */
58 /* current standard widths */
60 FT_Pos ah_snap_width( FT_Pos* widths,
65 FT_Pos best = 64 + 32 + 2;
66 FT_Pos reference = width;
69 for ( n = 0; n < count; n++ )
86 if ( width >= reference )
89 if ( width < reference )
95 if ( width > reference )
103 /* align one stem edge relative to the previous stem edge */
105 void ah_align_linked_edge( AH_Hinter* hinter,
110 FT_Pos dist = stem_edge->opos - base_edge->opos;
111 AH_Globals* globals = &hinter->globals->scaled;
123 dist = ah_snap_width( globals->heights, globals->num_heights, dist );
125 /* in the case of vertical hinting, always round */
126 /* the stem heights to integer pixels */
128 dist = ( dist + 16 ) & -64;
134 dist = ah_snap_width( globals->widths, globals->num_widths, dist );
136 if ( hinter->flags & ah_hinter_monochrome )
138 /* monochrome horizontal hinting: snap widths to integer pixels */
139 /* with a different threshold */
143 dist = ( dist + 32 ) & -64;
147 /* for horizontal anti-aliased hinting, we adopt a more subtle */
148 /* approach: we strengthen small stems, round stems whose size */
149 /* is between 1 and 2 pixels to an integer, otherwise nothing */
151 dist = ( dist + 64 ) >> 1;
153 else if ( dist < 128 )
154 dist = ( dist + 42 ) & -64;
158 stem_edge->pos = base_edge->pos + sign * dist;
163 void ah_align_serif_edge( AH_Hinter* hinter,
173 dist = serif->opos - base->opos;
180 /* do not strengthen serifs */
181 if ( base->flags & ah_edge_done )
184 dist = ( dist + 16 ) & -64;
186 else if ( dist <= 32 )
187 dist = ( dist + 33 ) >> 1;
190 serif->pos = base->pos + sign * dist;
194 /*************************************************************************/
195 /*************************************************************************/
196 /*************************************************************************/
198 /**** E D G E H I N T I N G ****/
200 /*************************************************************************/
201 /*************************************************************************/
202 /*************************************************************************/
205 /* Another alternative edge hinting algorithm */
207 void ah_hint_edges_3( AH_Hinter* hinter )
211 AH_Outline* outline = hinter->glyph;
215 edges = outline->horz_edges;
216 edge_limit = edges + outline->num_hedges;
218 for ( dimension = 1; dimension >= 0; dimension-- )
227 if ( disable_vert_edges && !dimension )
230 if ( disable_horz_edges && dimension )
233 /* we begin by aligning all stems relative to the blue zone */
234 /* if needed -- that's only for horizontal edges */
237 for ( edge = edges; edge < edge_limit; edge++ )
240 AH_Edge *edge1, *edge2;
243 if ( edge->flags & ah_edge_done )
246 blue = edge->blue_edge;
254 else if (edge2 && edge2->blue_edge)
256 blue = edge2->blue_edge;
264 edge1->pos = blue[0];
265 edge1->flags |= ah_edge_done;
267 if ( edge2 && !edge2->blue_edge )
269 ah_align_linked_edge( hinter, edge1, edge2, dimension );
270 edge2->flags |= ah_edge_done;
278 /* now, we will align all stem edges, trying to maintain the */
279 /* relative order of stems in the glyph.. */
282 for ( edge = edges; edge < edge_limit; edge++ )
287 if ( edge->flags & ah_edge_done )
290 /* skip all non-stem edges */
298 /* now, align the stem */
300 /* this should not happen, but it's better to be safe.. */
301 if ( edge2->blue_edge || edge2 < edge )
305 printf( "strange blue alignement, edge %d to %d\n",
306 edge - edges, edge2 - edges );
309 ah_align_linked_edge( hinter, edge2, edge, dimension );
310 edge->flags |= ah_edge_done;
320 edge->pos = ( edge->opos + 32 ) & -64;
324 edge->pos = anchor->pos +
325 ( ( edge->opos - anchor->opos + 32 ) & -64 );
327 edge->flags |= ah_edge_done;
329 if ( edge > edges && edge->pos < edge[-1].pos )
331 edge->pos = edge[-1].pos;
335 ah_align_linked_edge( hinter, edge, edge2, dimension );
337 if ( edge2 + 1 < edge_limit &&
338 edge2[1].flags & ah_edge_done )
339 delta = edge2[1].pos - edge2->pos;
347 edge2->flags |= ah_edge_done;
354 /* now, hint the remaining edges (serifs and single) in order */
355 /* to complete our processing */
356 for ( edge = edges; edge < edge_limit; edge++ )
358 if ( edge->flags & ah_edge_done )
363 ah_align_serif_edge( hinter, edge->serif, edge );
367 edge->pos = ( edge->opos + 32 ) & -64;
371 edge->pos = anchor->pos +
372 ( ( edge->opos-anchor->opos + 32 ) & -64 );
374 edge->flags |= ah_edge_done;
376 if ( edge > edges && edge->pos < edge[-1].pos )
377 edge->pos = edge[-1].pos;
379 if ( edge + 1 < edge_limit &&
380 edge[1].flags & ah_edge_done &&
381 edge->pos > edge[1].pos )
382 edge->pos = edge[1].pos;
386 edges = outline->vert_edges;
387 edge_limit = edges + outline->num_vedges;
393 void ah_hinter_hint_edges( AH_Hinter* hinter,
397 disable_horz_edges = no_horz_edges;
398 disable_vert_edges = no_vert_edges;
400 /* AH_Interpolate_Blue_Edges( hinter ); -- doesn't seem to help */
401 /* reduce the problem of the disappearing eye in the `e' of Times... */
402 /* also, creates some artifacts near the blue zones? */
404 ah_hint_edges_3( hinter );
407 /* outline optimizer removed temporarily */
408 if ( hinter->flags & ah_hinter_optimize )
413 if ( !AH_Optimizer_Init( &opt, hinter->glyph, hinter->memory ) )
415 AH_Optimizer_Compute( &opt );
416 AH_Optimizer_Done( &opt );
425 /*************************************************************************/
426 /*************************************************************************/
427 /*************************************************************************/
429 /**** P O I N T H I N T I N G ****/
431 /*************************************************************************/
432 /*************************************************************************/
433 /*************************************************************************/
436 void ah_hinter_align_edge_points( AH_Hinter* hinter )
438 AH_Outline* outline = hinter->glyph;
444 edges = outline->horz_edges;
445 edge_limit = edges + outline->num_hedges;
447 for ( dimension = 1; dimension >= 0; dimension-- )
458 for ( ; edge < edge_limit; edge++ )
460 /* move the points of each segment */
461 /* in each edge to the edge's position */
462 AH_Segment* seg = edge->first;
467 AH_Point* point = seg->first;
474 point->y = edge->pos;
475 point->flags |= ah_flah_touch_y;
479 point->x = edge->pos;
480 point->flags |= ah_flah_touch_x;
483 if ( point == seg->last )
489 seg = seg->edge_next;
491 } while ( seg != edge->first );
494 edges = outline->vert_edges;
495 edge_limit = edges + outline->num_vedges;
500 /* hint the strong points -- this is equivalent to the TrueType `IP' */
502 void ah_hinter_align_strong_points( AH_Hinter* hinter )
504 AH_Outline* outline = hinter->glyph;
509 AH_Point* point_limit;
513 points = outline->points;
514 point_limit = points + outline->num_points;
516 edges = outline->horz_edges;
517 edge_limit = edges + outline->num_hedges;
518 touch_flag = ah_flah_touch_y;
520 for ( dimension = 1; dimension >= 0; dimension-- )
531 if ( edges < edge_limit )
532 for ( point = points; point < point_limit; point++ )
534 FT_Pos u, ou, fu; /* point position */
538 if ( point->flags & touch_flag )
541 #ifndef AH_OPTION_NO_WEAK_INTERPOLATION
542 /* if this point is candidate to weak interpolation, we will */
543 /* interpolate it after all strong points have been processed */
544 if ( point->flags & ah_flah_weak_interpolation )
561 /* is the point before the first edge? */
563 delta = edge->fpos - u;
566 u = edge->pos - ( edge->opos - ou );
570 /* is the point after the last edge ? */
571 edge = edge_limit - 1;
572 delta = u - edge->fpos;
575 u = edge->pos + ( ou - edge->opos );
579 /* otherwise, interpolate the point in between */
585 for ( edge = edges; edge < edge_limit; edge++ )
587 if ( u == edge->fpos )
592 if ( u < edge->fpos )
597 for ( edge = edge_limit - 1; edge >= edges; edge-- )
599 if ( u == edge->fpos )
604 if ( u > edge->fpos )
609 /* assert( before && after && before != after ) */
610 u = before->pos + FT_MulDiv( fu - before->fpos,
611 after->pos - before->pos,
612 after->fpos - before->fpos );
617 /* save the point position */
623 point->flags |= touch_flag;
626 edges = outline->vert_edges;
627 edge_limit = edges + outline->num_vedges;
628 touch_flag = ah_flah_touch_x;
633 #ifndef AH_OPTION_NO_WEAK_INTERPOLATION
636 void ah_iup_shift( AH_Point* p1,
641 FT_Pos delta = ref->u - ref->v;
644 for ( p = p1; p < ref; p++ )
647 for ( p = ref + 1; p <= p2; p++ )
653 void ah_iup_interp( AH_Point* p1,
662 FT_Pos d1 = ref1->u - v1;
663 FT_Pos d2 = ref2->u - v2;
671 for ( p = p1; p <= p2; p++ )
688 for ( p = p1; p <= p2; p++ )
697 u = ref1->u + FT_MulDiv( u - v1, ref2->u - ref1->u, v2 - v1 );
704 for ( p = p1; p <= p2; p++ )
713 u = ref1->u + FT_MulDiv( u - v1, ref2->u - ref1->u, v2 - v1 );
721 /* interpolate weak points -- this is equivalent to the TrueType `IUP' */
723 void ah_hinter_align_weak_points( AH_Hinter* hinter )
725 AH_Outline* outline = hinter->glyph;
730 AH_Point* point_limit;
731 AH_Point** contour_limit;
735 points = outline->points;
736 point_limit = points + outline->num_points;
738 /* PASS 1: Move segment points to edge positions */
740 edges = outline->horz_edges;
741 edge_limit = edges + outline->num_hedges;
742 touch_flag = ah_flah_touch_y;
744 contour_limit = outline->contours + outline->num_contours;
746 ah_setup_uv( outline, ah_uv_oy );
748 for ( dimension = 1; dimension >= 0; dimension-- )
752 AH_Point* first_point;
757 contour = outline->contours;
759 for ( ; contour < contour_limit; contour++ )
762 end_point = point->prev;
765 while ( point <= end_point && !( point->flags & touch_flag ) )
768 if ( point <= end_point )
770 AH_Point* first_touched = point;
771 AH_Point* cur_touched = point;
775 while ( point <= end_point )
777 if ( point->flags & touch_flag )
779 /* we found two successive touched points; we interpolate */
780 /* all contour points between them */
781 ah_iup_interp( cur_touched + 1, point - 1,
782 cur_touched, point );
788 if ( cur_touched == first_touched )
790 /* this is a special case: only one point was touched in the */
791 /* contour; we thus simply shift the whole contour */
792 ah_iup_shift( first_point, end_point, cur_touched );
796 /* now interpolate after the last touched point to the end */
798 ah_iup_interp( cur_touched + 1, end_point,
799 cur_touched, first_touched );
801 /* if the first contour point isn't touched, interpolate */
802 /* from the contour start to the first touched point */
803 if ( first_touched > points )
804 ah_iup_interp( first_point, first_touched - 1,
805 cur_touched, first_touched );
810 /* now save the interpolated values back to x/y */
813 for ( point = points; point < point_limit; point++ )
816 touch_flag = ah_flah_touch_x;
817 ah_setup_uv( outline, ah_uv_ox );
821 for ( point = points; point < point_limit; point++ )
824 break; /* exit loop */
829 #endif /* !AH_OPTION_NO_WEAK_INTERPOLATION */
833 void ah_hinter_align_points( AH_Hinter* hinter )
835 ah_hinter_align_edge_points( hinter );
837 #ifndef AH_OPTION_NO_STRONG_INTERPOLATION
838 ah_hinter_align_strong_points( hinter );
841 #ifndef AH_OPTION_NO_WEAK_INTERPOLATION
842 ah_hinter_align_weak_points( hinter );
847 /*************************************************************************/
848 /*************************************************************************/
849 /*************************************************************************/
851 /**** H I N T E R O B J E C T M E T H O D S ****/
853 /*************************************************************************/
854 /*************************************************************************/
855 /*************************************************************************/
858 /* scale and fit the global metrics */
860 void ah_hinter_scale_globals( AH_Hinter* hinter,
865 AH_Face_Globals* globals = hinter->globals;
866 AH_Globals* design = &globals->design;
867 AH_Globals* scaled = &globals->scaled;
873 /* scale the standard widths & heights */
874 for ( n = 0; n < design->num_widths; n++ )
875 scaled->widths[n] = FT_MulFix( design->widths[n], x_scale );
877 for ( n = 0; n < design->num_heights; n++ )
878 scaled->heights[n] = FT_MulFix( design->heights[n], y_scale );
880 /* scale the blue zones */
881 for ( n = 0; n < ah_blue_max; n++ )
883 FT_Pos delta, delta2;
886 delta = design->blue_shoots[n] - design->blue_refs[n];
890 delta2 = FT_MulFix( delta2, y_scale );
894 else if ( delta2 < 64 )
895 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & -32 );
897 delta2 = ( delta2 + 32 ) & -64;
902 scaled->blue_refs[n] =
903 ( FT_MulFix( design->blue_refs[n], y_scale ) + 32 ) & -64;
904 scaled->blue_shoots[n] = scaled->blue_refs[n] + delta2;
907 globals->x_scale = x_scale;
908 globals->y_scale = y_scale;
913 void ah_hinter_align( AH_Hinter* hinter )
915 ah_hinter_align_edge_points( hinter );
916 ah_hinter_align_points( hinter );
920 /* finalize a hinter object */
921 void ah_hinter_done( AH_Hinter* hinter )
925 FT_Memory memory = hinter->memory;
928 ah_loader_done( hinter->loader );
929 ah_outline_done( hinter->glyph );
931 /* note: the `globals' pointer is _not_ owned by the hinter */
932 /* but by the current face object, we don't need to */
942 /* create a new empty hinter object */
943 FT_Error ah_hinter_new( FT_Library library,
944 AH_Hinter** ahinter )
946 AH_Hinter* hinter = 0;
947 FT_Memory memory = library->memory;
953 /* allocate object */
954 if ( ALLOC( hinter, sizeof ( *hinter ) ) )
957 hinter->memory = memory;
960 /* allocate outline and loader */
961 error = ah_outline_new( memory, &hinter->glyph ) ||
962 ah_loader_new ( memory, &hinter->loader ) ||
963 ah_loader_create_extra( hinter->loader );
971 ah_hinter_done( hinter );
977 /* create a face's autohint globals */
978 FT_Error ah_hinter_new_face_globals( AH_Hinter* hinter,
980 AH_Globals* globals )
983 FT_Memory memory = hinter->memory;
984 AH_Face_Globals* face_globals;
987 if ( ALLOC( face_globals, sizeof ( *face_globals ) ) )
991 hinter->globals = face_globals;
994 face_globals->design = *globals;
996 ah_hinter_compute_globals( hinter );
998 face->autohint.data = face_globals;
999 face->autohint.finalizer = (FT_Generic_Finalizer)
1000 ah_hinter_done_face_globals;
1001 face_globals->face = face;
1008 /* discard a face's autohint globals */
1009 void ah_hinter_done_face_globals( AH_Face_Globals* globals )
1011 FT_Face face = globals->face;
1012 FT_Memory memory = face->memory;
1020 FT_Error ah_hinter_load( AH_Hinter* hinter,
1021 FT_UInt glyph_index,
1025 FT_Face face = hinter->face;
1026 FT_GlyphSlot slot = face->glyph;
1027 FT_Fixed x_scale = face->size->metrics.x_scale;
1028 FT_Fixed y_scale = face->size->metrics.y_scale;
1029 FT_Glyph_Metrics metrics; /* temporary metrics */
1031 AH_Outline* outline = hinter->glyph;
1032 AH_Loader* gloader = hinter->loader;
1033 FT_Bool no_horz_hints =
1034 ( load_flags & AH_HINT_NO_HORZ_EDGES ) != 0;
1035 FT_Bool no_vert_hints =
1036 ( load_flags & AH_HINT_NO_VERT_EDGES ) != 0;
1039 /* load the glyph */
1040 error = FT_Load_Glyph( face, glyph_index, load_flags );
1044 /* save current glyph metrics */
1045 metrics = slot->metrics;
1047 switch ( slot->format )
1049 case ft_glyph_format_outline:
1050 /* first of all, copy the outline points in the loader's current */
1051 /* extra points, which is used to keep original glyph coordinates */
1052 error = ah_loader_check_points( gloader, slot->outline.n_points + 2,
1053 slot->outline.n_contours );
1057 MEM_Copy( gloader->current.extra_points, slot->outline.points,
1058 slot->outline.n_points * sizeof ( FT_Vector ) );
1060 MEM_Copy( gloader->current.outline.contours, slot->outline.contours,
1061 slot->outline.n_contours * sizeof ( short ) );
1063 MEM_Copy( gloader->current.outline.tags, slot->outline.tags,
1064 slot->outline.n_points * sizeof ( char ) );
1066 gloader->current.outline.n_points = slot->outline.n_points;
1067 gloader->current.outline.n_contours = slot->outline.n_contours;
1069 /* compute original phantom points */
1072 hinter->pp2.x = FT_MulFix( slot->metrics.horiAdvance, x_scale );
1075 /* be sure to check for spacing glyphs */
1076 if ( slot->outline.n_points == 0 )
1079 /* now, load the slot image into the auto-outline, and run the */
1080 /* automatic hinting process */
1081 error = ah_outline_load( outline, face ); /* XXX: change to slot */
1085 /* perform feature detection */
1086 ah_outline_detect_features( outline );
1088 if ( !no_horz_hints )
1090 ah_outline_compute_blue_edges( outline, hinter->globals );
1091 ah_outline_scale_blue_edges( outline, hinter->globals );
1094 /* perform alignment control */
1095 ah_hinter_hint_edges( hinter, no_horz_hints, no_vert_hints );
1096 ah_hinter_align( hinter );
1098 /* now save the current outline into the loader's current table */
1099 ah_outline_save( outline, gloader );
1101 /* we now need to hint the metrics according to the change in */
1102 /* width/positioning that occured during the hinting process */
1104 FT_Pos old_width, new_width;
1105 FT_Pos old_advance, new_advance;
1106 FT_Pos old_lsb, new_lsb;
1107 AH_Edge* edge1 = outline->vert_edges; /* leftmost edge */
1108 AH_Edge* edge2 = edge1 +
1109 outline->num_vedges - 1; /* rightmost edge */
1112 old_width = edge2->opos - edge1->opos;
1113 new_width = edge2->pos - edge1->pos;
1115 old_advance = hinter->pp2.x;
1116 old_lsb = edge1->opos;
1117 new_lsb = edge1->pos;
1119 new_advance = old_advance +
1120 ( new_width + new_lsb - old_width - old_lsb );
1122 hinter->pp1.x = ( ( new_lsb - old_lsb ) + 32 ) & -64;
1123 hinter->pp2.x = ( ( edge2->pos +
1124 ( old_advance - edge2->opos ) ) + 32 ) & -64;
1127 /* good, we simply add the glyph to our loader's base */
1128 ah_loader_add( gloader );
1131 case ft_glyph_format_composite:
1133 FT_UInt nn, num_subglyphs = slot->num_subglyphs;
1134 FT_UInt num_base_subgs, start_point, start_contour;
1135 FT_SubGlyph* subglyph;
1138 start_point = gloader->base.outline.n_points;
1139 start_contour = gloader->base.outline.n_contours;
1141 /* first of all, copy the subglyph descriptors in the glyph loader */
1142 error = ah_loader_check_subglyphs( gloader, num_subglyphs );
1146 MEM_Copy( gloader->current.subglyphs, slot->subglyphs,
1147 num_subglyphs * sizeof ( FT_SubGlyph ) );
1149 gloader->current.num_subglyphs = num_subglyphs;
1150 num_base_subgs = gloader->base.num_subglyphs;
1152 /* now, read each subglyph independently */
1153 for ( nn = 0; nn < num_subglyphs; nn++ )
1157 FT_UInt num_points, num_new_points, num_base_points;
1160 /* gloader.current.subglyphs can change during glyph loading due */
1161 /* to re-allocation -- we must recompute the current subglyph on */
1162 /* each iteration */
1163 subglyph = gloader->base.subglyphs + num_base_subgs + nn;
1168 num_base_points = gloader->base.outline.n_points;
1170 error = ah_hinter_load( hinter, subglyph->index,
1171 load_flags, depth + 1 );
1175 /* recompute subglyph pointer */
1176 subglyph = gloader->base.subglyphs + num_base_subgs + nn;
1178 if ( subglyph->flags & FT_SUBGLYPH_FLAG_USE_MY_METRICS )
1189 num_points = gloader->base.outline.n_points;
1190 num_new_points = num_points - num_base_points;
1192 /* now perform the transform required for this subglyph */
1194 if ( subglyph->flags & ( FT_SUBGLYPH_FLAG_SCALE |
1195 FT_SUBGLYPH_FLAG_XY_SCALE |
1196 FT_SUBGLYPH_FLAG_2X2 ) )
1198 FT_Vector* cur = gloader->base.outline.points +
1200 FT_Vector* org = gloader->base.extra_points +
1202 FT_Vector* limit = cur + num_new_points;
1205 for ( ; cur < limit; cur++, org++ )
1207 FT_Vector_Transform( cur, &subglyph->transform );
1208 FT_Vector_Transform( org, &subglyph->transform );
1214 if ( !( subglyph->flags & FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES ) )
1216 FT_Int k = subglyph->arg1;
1217 FT_UInt l = subglyph->arg2;
1222 if ( start_point + k >= num_base_points ||
1223 l >= (FT_UInt)num_new_points )
1225 error = FT_Err_Invalid_Composite;
1229 l += num_base_points;
1231 /* for now, only use the current point coordinates */
1232 /* we may consider another approach in the near future */
1233 p1 = gloader->base.outline.points + start_point + k;
1234 p2 = gloader->base.outline.points + start_point + l;
1241 x = FT_MulFix( subglyph->arg1, x_scale );
1242 y = FT_MulFix( subglyph->arg2, y_scale );
1244 x = ( x + 32 ) & -64;
1245 y = ( y + 32 ) & -64;
1249 FT_Outline dummy = gloader->base.outline;
1252 dummy.points += num_base_points;
1253 dummy.n_points = num_new_points;
1255 FT_Outline_Translate( &dummy, x, y );
1262 /* we don't support other formats (yet?) */
1263 error = FT_Err_Unimplemented_Feature;
1272 /* we must translate our final outline by -pp1.x, and compute */
1273 /* the new metrics */
1274 if ( hinter->pp1.x )
1275 FT_Outline_Translate( &gloader->base.outline, -hinter->pp1.x, 0 );
1277 FT_Outline_Get_CBox( &gloader->base.outline, &bbox );
1280 bbox.xMax = ( bbox.xMax + 63 ) & -64;
1281 bbox.yMax = ( bbox.yMax + 63 ) & -64;
1283 slot->metrics.width = bbox.xMax - bbox.xMin;
1284 slot->metrics.height = bbox.yMax - bbox.yMin;
1285 slot->metrics.horiBearingX = bbox.xMin;
1286 slot->metrics.horiBearingY = bbox.yMax;
1287 slot->metrics.horiAdvance = hinter->pp2.x - hinter->pp1.x;
1288 /* XXX: TO DO - slot->linearHoriAdvance */
1290 /* now copy outline into glyph slot */
1291 ah_loader_rewind( slot->loader );
1292 error = ah_loader_copy_points( slot->loader, gloader );
1296 slot->outline = slot->loader->base.outline;
1297 slot->format = ft_glyph_format_outline;
1305 /* load and hint a given glyph */
1306 FT_Error ah_hinter_load_glyph( AH_Hinter* hinter,
1309 FT_UInt glyph_index,
1312 FT_Face face = slot->face;
1314 FT_Fixed x_scale = size->metrics.x_scale;
1315 FT_Fixed y_scale = size->metrics.y_scale;
1316 AH_Face_Globals* face_globals = FACE_GLOBALS( face );
1319 /* first of all, we need to check that we're using the correct face and */
1320 /* global hints to load the glyph */
1321 if ( hinter->face != face || hinter->globals != face_globals )
1323 hinter->face = face;
1324 if ( !face_globals )
1326 error = ah_hinter_new_face_globals( hinter, face, 0 );
1330 hinter->globals = FACE_GLOBALS( face );
1331 face_globals = FACE_GLOBALS( face );
1334 /* now, we must check the current character pixel size to see if we */
1335 /* need to rescale the global metrics */
1336 if ( face_globals->x_scale != x_scale ||
1337 face_globals->y_scale != y_scale )
1338 ah_hinter_scale_globals( hinter, x_scale, y_scale );
1340 load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_RECURSE;
1342 ah_loader_rewind( hinter->loader );
1344 error = ah_hinter_load( hinter, glyph_index, load_flags, 0 );
1351 /* retrieve a face's autohint globals for client applications */
1352 void ah_hinter_get_global_hints( AH_Hinter* hinter,
1354 void** global_hints,
1357 AH_Globals* globals = 0;
1358 FT_Memory memory = hinter->memory;
1362 /* allocate new master globals */
1363 if ( ALLOC( globals, sizeof ( *globals ) ) )
1366 /* compute face globals if needed */
1367 if ( !FACE_GLOBALS( face ) )
1369 error = ah_hinter_new_face_globals( hinter, face, 0 );
1374 *globals = FACE_GLOBALS( face )->design;
1375 *global_hints = globals;
1376 *global_len = sizeof( *globals );
1388 void ah_hinter_done_global_hints( AH_Hinter* hinter,
1389 void* global_hints )
1391 FT_Memory memory = hinter->memory;
1394 FREE( global_hints );