1 /***************************************************************************/
5 /* Auto-fitter glyph loading routines (body). */
7 /* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 by */
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
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. */
16 /***************************************************************************/
25 FT_LOCAL_DEF( FT_Error )
26 af_loader_init( AF_Loader loader,
31 af_glyph_hints_init( &loader->hints, memory );
33 _af_debug_hints = &loader->hints;
35 return FT_GlyphLoader_New( memory, &loader->gloader );
39 FT_LOCAL_DEF( FT_Error )
40 af_loader_reset( AF_Loader loader,
43 FT_Error error = AF_Err_Ok;
47 loader->globals = (AF_FaceGlobals)face->autohint.data;
49 FT_GlyphLoader_Rewind( loader->gloader );
51 if ( loader->globals == NULL )
53 error = af_face_globals_new( face, &loader->globals );
57 (FT_Pointer)loader->globals;
58 face->autohint.finalizer =
59 (FT_Generic_Finalizer)af_face_globals_free;
68 af_loader_done( AF_Loader loader )
70 af_glyph_hints_done( &loader->hints );
73 loader->globals = NULL;
76 _af_debug_hints = NULL;
78 FT_GlyphLoader_Done( loader->gloader );
79 loader->gloader = NULL;
84 af_loader_load_g( AF_Loader loader,
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;
99 error = FT_Load_Glyph( face, glyph_index, load_flags );
103 loader->transformed = internal->glyph_transformed;
104 if ( loader->transformed )
109 loader->trans_matrix = internal->glyph_matrix;
110 loader->trans_delta = internal->glyph_delta;
112 inverse = loader->trans_matrix;
113 FT_Matrix_Invert( &inverse );
114 FT_Vector_Transform( &loader->trans_delta, &inverse );
117 /* set linear metrics */
118 slot->linearHoriAdvance = slot->metrics.horiAdvance;
119 slot->linearVertAdvance = slot->metrics.vertAdvance;
121 switch ( slot->format )
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 );
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 );
138 FT_ARRAY_COPY( gloader->current.outline.points,
139 slot->outline.points,
140 slot->outline.n_points );
142 FT_ARRAY_COPY( gloader->current.outline.contours,
143 slot->outline.contours,
144 slot->outline.n_contours );
146 FT_ARRAY_COPY( gloader->current.outline.tags,
148 slot->outline.n_points );
150 gloader->current.outline.n_points = slot->outline.n_points;
151 gloader->current.outline.n_contours = slot->outline.n_contours;
153 /* compute original horizontal phantom points (and ignore */
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;
161 /* be sure to check for spacing glyphs */
162 if ( slot->outline.n_points == 0 )
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,
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 )
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 */
184 if ( axis->num_edges > 1 && AF_HINTS_DO_ADVANCE( hints ) )
186 old_rsb = loader->pp2.x - edge2->opos;
187 old_lsb = edge1->opos;
188 new_lsb = edge1->pos;
190 /* remember unhinted values to later account */
191 /* for rounding errors */
193 pp1x_uh = new_lsb - old_lsb;
194 pp2x_uh = edge2->pos + old_rsb;
196 /* prefer too much space over too little space */
197 /* for very small sizes */
205 loader->pp1.x = FT_PIX_ROUND( pp1x_uh );
206 loader->pp2.x = FT_PIX_ROUND( pp2x_uh );
208 if ( loader->pp1.x >= new_lsb && old_lsb > 0 )
211 if ( loader->pp2.x <= edge2->pos && old_rsb > 0 )
214 slot->lsb_delta = loader->pp1.x - pp1x_uh;
215 slot->rsb_delta = loader->pp2.x - pp2x_uh;
219 FT_Pos pp1x = loader->pp1.x;
220 FT_Pos pp2x = loader->pp2.x;
223 loader->pp1.x = FT_PIX_ROUND( pp1x );
224 loader->pp2.x = FT_PIX_ROUND( pp2x );
226 slot->lsb_delta = loader->pp1.x - pp1x;
227 slot->rsb_delta = loader->pp2.x - pp2x;
232 FT_Pos pp1x = loader->pp1.x;
233 FT_Pos pp2x = loader->pp2.x;
236 loader->pp1.x = FT_PIX_ROUND( pp1x + hints->xmin_delta );
237 loader->pp2.x = FT_PIX_ROUND( pp2x + hints->xmax_delta );
239 slot->lsb_delta = loader->pp1.x - pp1x;
240 slot->rsb_delta = loader->pp2.x - pp2x;
243 /* good, we simply add the glyph to our loader's base */
244 FT_GlyphLoader_Add( gloader );
247 case FT_GLYPH_FORMAT_COMPOSITE:
249 FT_UInt nn, num_subglyphs = slot->num_subglyphs;
250 FT_UInt num_base_subgs, start_point;
251 FT_SubGlyph subglyph;
254 start_point = gloader->base.outline.n_points;
256 /* first of all, copy the subglyph descriptors in the glyph loader */
257 error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs );
261 FT_ARRAY_COPY( gloader->current.subglyphs,
265 gloader->current.num_subglyphs = num_subglyphs;
266 num_base_subgs = gloader->base.num_subglyphs;
268 /* now, read each subglyph independently */
269 for ( nn = 0; nn < num_subglyphs; nn++ )
273 FT_UInt num_points, num_new_points, num_base_points;
276 /* gloader.current.subglyphs can change during glyph loading due */
277 /* to re-allocation -- we must recompute the current subglyph on */
279 subglyph = gloader->base.subglyphs + num_base_subgs + nn;
284 num_base_points = gloader->base.outline.n_points;
286 error = af_loader_load_g( loader, scaler, subglyph->index,
287 load_flags, depth + 1 );
291 /* recompute subglyph pointer */
292 subglyph = gloader->base.subglyphs + num_base_subgs + nn;
294 if ( subglyph->flags & FT_SUBGLYPH_FLAG_USE_MY_METRICS )
305 num_points = gloader->base.outline.n_points;
306 num_new_points = num_points - num_base_points;
308 /* now perform the transform required for this subglyph */
310 if ( subglyph->flags & ( FT_SUBGLYPH_FLAG_SCALE |
311 FT_SUBGLYPH_FLAG_XY_SCALE |
312 FT_SUBGLYPH_FLAG_2X2 ) )
314 FT_Vector* cur = gloader->base.outline.points +
316 FT_Vector* limit = cur + num_new_points;
319 for ( ; cur < limit; cur++ )
320 FT_Vector_Transform( cur, &subglyph->transform );
325 if ( !( subglyph->flags & FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES ) )
327 FT_Int k = subglyph->arg1;
328 FT_UInt l = subglyph->arg2;
333 if ( start_point + k >= num_base_points ||
334 l >= (FT_UInt)num_new_points )
336 error = AF_Err_Invalid_Composite;
340 l += num_base_points;
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;
352 x = FT_MulFix( subglyph->arg1, hints->x_scale ) + hints->x_delta;
353 y = FT_MulFix( subglyph->arg2, hints->y_scale ) + hints->y_delta;
355 x = FT_PIX_ROUND( x );
356 y = FT_PIX_ROUND( y );
360 FT_Outline dummy = gloader->base.outline;
363 dummy.points += num_base_points;
364 dummy.n_points = (short)num_new_points;
366 FT_Outline_Translate( &dummy, x, y );
373 /* we don't support other formats (yet?) */
374 error = AF_Err_Unimplemented_Feature;
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 );
389 /* transform the hinted outline if needed */
390 if ( loader->transformed )
392 FT_Outline_Transform( &gloader->base.outline, &loader->trans_matrix );
393 FT_Vector_Transform( &vvector, &loader->trans_matrix );
396 /* we must translate our final outline by -pp1.x and compute */
397 /* the new metrics */
399 FT_Outline_Translate( &gloader->base.outline, -loader->pp1.x, 0 );
401 FT_Outline_Get_CBox( &gloader->base.outline, &bbox );
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 );
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;
413 slot->metrics.vertBearingX = FT_PIX_FLOOR( bbox.xMin + vvector.x );
414 slot->metrics.vertBearingY = FT_PIX_FLOOR( bbox.yMax + vvector.y );
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 */
420 if ( !FT_IS_FIXED_WIDTH( slot->face ) )
421 slot->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
423 slot->metrics.horiAdvance = FT_MulFix( slot->metrics.horiAdvance,
426 if ( FT_IS_FIXED_WIDTH( slot->face ) ||
427 ( af_face_globals_is_digit( loader->globals, glyph_index ) &&
428 metrics->digits_have_same_width ) )
430 slot->metrics.horiAdvance = FT_MulFix( slot->metrics.horiAdvance,
431 metrics->scaler.x_scale );
433 /* Set delta values to 0. Otherwise code that uses them is */
434 /* going to ruin the fixed advance width. */
440 /* non-spacing glyphs must stay as-is */
441 if ( slot->metrics.horiAdvance )
442 slot->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
446 slot->metrics.vertAdvance = FT_MulFix( slot->metrics.vertAdvance,
447 metrics->scaler.y_scale );
449 slot->metrics.horiAdvance = FT_PIX_ROUND( slot->metrics.horiAdvance );
450 slot->metrics.vertAdvance = FT_PIX_ROUND( slot->metrics.vertAdvance );
452 /* now copy outline into glyph slot */
453 FT_GlyphLoader_Rewind( internal->loader );
454 error = FT_GlyphLoader_CopyPoints( internal->loader, gloader );
458 slot->outline = internal->loader->base.outline;
459 slot->format = FT_GLYPH_FORMAT_OUTLINE;
463 af_debug_hinter = hinter;
471 FT_LOCAL_DEF( FT_Error )
472 af_loader_load_glyph( AF_Loader loader,
475 FT_UInt32 load_flags )
478 FT_Size size = face->size;
483 return AF_Err_Invalid_Argument;
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 */
493 scaler.render_mode = FT_LOAD_TARGET_MODE( load_flags );
494 scaler.flags = 0; /* XXX: fix this */
496 error = af_loader_reset( loader, face );
499 AF_ScriptMetrics metrics;
503 #ifdef FT_OPTION_AUTOFIT2
504 /* XXX: undocumented hook to activate the latin2 hinter */
505 if ( load_flags & ( 1UL << 20 ) )
509 error = af_face_globals_get_metrics( loader->globals, gindex,
513 loader->metrics = metrics;
515 if ( metrics->clazz->script_metrics_scale )
516 metrics->clazz->script_metrics_scale( metrics, &scaler );
518 metrics->scaler = scaler;
520 load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_IGNORE_TRANSFORM;
521 load_flags &= ~FT_LOAD_RENDER;
523 if ( metrics->clazz->script_hints_init )
525 error = metrics->clazz->script_hints_init( &loader->hints,
531 error = af_loader_load_g( loader, &scaler, gindex, load_flags, 0 );