| #include "aflatin.h" | |
| /***************************************************************************/ | |
| /***************************************************************************/ | |
| /***** *****/ | |
| /***** L A T I N G L O B A L M E T R I C S *****/ | |
| /***** *****/ | |
| /***************************************************************************/ | |
| /***************************************************************************/ | |
| static void | |
| af_latin_metrics_init_widths( AF_LatinMetrics metrics, | |
| FT_Face face ) | |
| { | |
| /* scan the array of segments in each direction */ | |
| AF_GlyphHintsRec hints[1]; | |
| af_glyph_hints_init( hints, face->memory ); | |
| metrics->axis[ AF_DIMENSION_HORZ ].width_count = 0; | |
| metrics->axis[ AF_DIMENSION_VERT ].width_count = 0; | |
| /* For now, compute the standard width and height from the `o' */ | |
| { | |
| FT_Error error; | |
| FT_UInt glyph_index; | |
| AF_Dimension dim; | |
| AF_ScalerRec scaler[1]; | |
| glyph_index = FT_Get_Char_Index( face, 'o' ); | |
| if ( glyph_index == 0 ) | |
| goto Exit; | |
| error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); | |
| if ( error || face->glyph->outline.n_points <= 0 ) | |
| goto Exit; | |
| scaler->x_scale = scaler->y_scale = 0x10000L; | |
| scaler->x_delta = scaler->y_delta = 0; | |
| scaler->face = face; | |
| scaler->render_mode = 0; | |
| scaler->flags = 0; | |
| error = af_glyph_hints_reset( hints, scaler, | |
| (AF_ScriptMetrics) metrics, | |
| &face->glyph->outline ); | |
| if ( error ) | |
| goto Exit; | |
| for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) | |
| { | |
| AF_LatinAxis axis = & metrics->axis[ dim ]; | |
| AF_AxisHints axhints = & hints->axis[ dim ]; | |
| AF_Segment seg, limit, link; | |
| FT_UInt num_widths = 0; | |
| FT_Pos edge_distance_threshold = 32000; | |
| af_latin_hints_compute_segments( hints, dim ); | |
| af_latin_hints_link_segments ( hints, dim ); | |
| seg = axhints->segments; | |
| limit = seg + axhints->num_segments; | |
| for ( ; seg < limit; seg++ ) | |
| { | |
| link = seg->link; | |
| /* we only consider stem segments there! */ | |
| if ( link && link->link == seg && link > seg ) | |
| { | |
| FT_Pos dist; | |
| dist = seg->pos - link->pos; | |
| if ( dist < 0 ) | |
| dist = -dist; | |
| if ( num_widths < AF_LATIN_MAX_WIDTHS ) | |
| axis->widths[ num_widths++ ].org = dist; | |
| } | |
| } | |
| af_sort_widths( num_widths, axis->widths ); | |
| axis->width_count = num_widths; | |
| /* we will now try to find the smallest width */ | |
| if ( num_widths > 0 && axis->widths[0].org < edge_distance_threshold ) | |
| edge_distance_threshold = axis->widths[0].org; | |
| /* Now, compute the edge distance threshold as a fraction of the */ | |
| /* smallest width in the font. Set it in `hinter->glyph' too! */ | |
| if ( edge_distance_threshold == 32000 ) | |
| edge_distance_threshold = 50; | |
| /* let's try 20% */ | |
| axis->edge_distance_threshold = edge_distance_threshold / 5; | |
| } | |
| } | |
| Exit: | |
| af_glyph_hints_done( hints ); | |
| } | |
| #define AF_LATIN_MAX_TEST_CHARACTERS 12 | |
| static const char* const af_latin_blue_chars[ AF_LATIN_MAX_BLUES ] = | |
| { | |
| "THEZOCQS", | |
| "HEZLOCUS", | |
| "fijkdbh", | |
| "xzroesc", | |
| "xzroesc", | |
| "pqgjy" | |
| }; | |
| static void | |
| af_latin_metrics_init_blues( AF_LatinMetrics metrics, | |
| FT_Face face ) | |
| { | |
| FT_Pos flats [ AF_LATIN_MAX_TEST_CHARACTERS ]; | |
| FT_Pos rounds[ AF_LATIN_MAX_TEST_CHARACTERS ]; | |
| FT_Int num_flats; | |
| FT_Int num_rounds; | |
| FT_Int bb; | |
| AF_LatinBlue blue; | |
| FT_Error error; | |
| AF_LatinAxis axis = &metrics->axis[ AF_DIMENSION_VERT ]; | |
| FT_GlyphSlot glyph = face->glyph; | |
| /* we compute the blues simply by loading each character from the */ | |
| /* 'af_latin_blue_chars[blues]' string, then compute its top-most or */ | |
| /* bottom-most points (depending on `AF_IS_TOP_BLUE') */ | |
| AF_LOG(( "blue zones computation\n" )); | |
| AF_LOG(( "------------------------------------------------\n" )); | |
| for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) | |
| { | |
| const char* p = af_latin_blue_chars[bb]; | |
| const char* limit = p + AF_LATIN_MAX_TEST_CHARACTERS; | |
| FT_Pos* blue_ref; | |
| FT_Pos* blue_shoot; | |
| AF_LOG(( "blue %3d: ", bb )); | |
| num_flats = 0; | |
| num_rounds = 0; | |
| for ( ; p < limit && *p; p++ ) | |
| { | |
| FT_UInt glyph_index; | |
| FT_Vector* extremum; | |
| FT_Vector* points; | |
| FT_Vector* point_limit; | |
| FT_Vector* point; | |
| FT_Bool round; | |
| AF_LOG(( "'%c'", *p )); | |
| /* load the character in the face -- skip unknown or empty ones */ | |
| glyph_index = FT_Get_Char_Index( face, (FT_UInt)*p ); | |
| if ( glyph_index == 0 ) | |
| continue; | |
| error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); | |
| if ( error || glyph->outline.n_points <= 0 ) | |
| continue; | |
| /* now compute min or max point indices and coordinates */ | |
| points = glyph->outline.points; | |
| point_limit = points + glyph->outline.n_points; | |
| point = points; | |
| extremum = point; | |
| point++; | |
| if ( AF_LATIN_IS_TOP_BLUE( bb ) ) | |
| { | |
| for ( ; point < point_limit; point++ ) | |
| if ( point->y > extremum->y ) | |
| extremum = point; | |
| } | |
| else | |
| { | |
| for ( ; point < point_limit; point++ ) | |
| if ( point->y < extremum->y ) | |
| extremum = point; | |
| } | |
| AF_LOG(( "%5d", (int)extremum->y )); | |
| /* now, check whether the point belongs to a straight or round */ | |
| /* segment; we first need to find in which contour the extremum */ | |
| /* lies, then see its previous and next points */ | |
| { | |
| FT_Int idx = (FT_Int)( extremum - points ); | |
| FT_Int n; | |
| FT_Int first, last, prev, next, end; | |
| FT_Pos dist; | |
| last = -1; | |
| first = 0; | |
| for ( n = 0; n < glyph->outline.n_contours; n++ ) | |
| { | |
| end = glyph->outline.contours[n]; | |
| if ( end >= idx ) | |
| { | |
| last = end; | |
| break; | |
| } | |
| first = end + 1; | |
| } | |
| /* XXX: should never happen! */ | |
| if ( last < 0 ) | |
| continue; | |
| /* now look for the previous and next points that are not on the */ | |
| /* same Y coordinate. Threshold the `closeness'... */ | |
| prev = idx; | |
| next = prev; | |
| do | |
| { | |
| if ( prev > first ) | |
| prev--; | |
| else | |
| prev = last; | |
| dist = points[prev].y - extremum->y; | |
| if ( dist < -5 || dist > 5 ) | |
| break; | |
| } while ( prev != idx ); | |
| do | |
| { | |
| if ( next < last ) | |
| next++; | |
| else | |
| next = first; | |
| dist = points[next].y - extremum->y; | |
| if ( dist < -5 || dist > 5 ) | |
| break; | |
| } while ( next != idx ); | |
| /* now, set the `round' flag depending on the segment's kind */ | |
| round = FT_BOOL( | |
| FT_CURVE_TAG( glyph->outline.tags[prev] ) != FT_CURVE_TAG_ON || | |
| FT_CURVE_TAG( glyph->outline.tags[next] ) != FT_CURVE_TAG_ON ); | |
| AF_LOG(( "%c ", round ? 'r' : 'f' )); | |
| } | |
| if ( round ) | |
| rounds[num_rounds++] = extremum->y; | |
| else | |
| flats[num_flats++] = extremum->y; | |
| } | |
| AF_LOG(( "\n" )); | |
| if ( num_flats == 0 && num_rounds == 0 ) | |
| { | |
| /* we couldn't find a single glyph to compute this blue zone, | |
| * we will simply ignore it then | |
| */ | |
| AF_LOG(( "empty !!\n" )); | |
| continue; | |
| } | |
| /* we have computed the contents of the `rounds' and `flats' tables, */ | |
| /* now determine the reference and overshoot position of the blue -- */ | |
| /* we simply take the median value after a simple sort */ | |
| af_sort_pos( num_rounds, rounds ); | |
| af_sort_pos( num_flats, flats ); | |
| blue = & axis->blues[ axis->blue_count ]; | |
| blue_ref = & blue->ref.org; | |
| blue_shoot = & blue->shoot.org; | |
| axis->blue_count ++; | |
| if ( num_flats == 0 ) | |
| { | |
| *blue_ref = | |
| *blue_shoot = rounds[num_rounds / 2]; | |
| } | |
| else if ( num_rounds == 0 ) | |
| { | |
| *blue_ref = | |
| *blue_shoot = flats[num_flats / 2]; | |
| } | |
| else | |
| { | |
| *blue_ref = flats[num_flats / 2]; | |
| *blue_shoot = rounds[num_rounds / 2]; | |
| } | |
| /* there are sometimes problems: if the overshoot position of top */ | |
| /* zones is under its reference position, or the opposite for bottom */ | |
| /* zones. We must thus check everything there and correct the errors */ | |
| if ( *blue_shoot != *blue_ref ) | |
| { | |
| FT_Pos ref = *blue_ref; | |
| FT_Pos shoot = *blue_shoot; | |
| FT_Bool over_ref = FT_BOOL( shoot > ref ); | |
| if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref ) | |
| *blue_shoot = *blue_ref = ( shoot + ref ) / 2; | |
| } | |
| blue->flags = 0; | |
| if ( AF_LATIN_IS_TOP_BLUE(bb) ) | |
| blue->flags |= AF_LATIN_BLUE_TOP; | |
| AF_LOG(( "-- ref = %ld, shoot = %ld\n", *blue_ref, *blue_shoot )); | |
| } | |
| return; | |
| } | |
| FT_LOCAL_DEF( FT_Error ) | |
| af_latin_metrics_init( AF_LatinMetrics metrics, | |
| FT_Face face ) | |
| { | |
| FT_Error error; | |
| FT_CharMap oldmap = face->charmap; | |
| /* do we have a Unicode charmap in there? */ | |
| error = FT_Select_Charmap( face, FT_ENCODING_UNICODE ); | |
| if ( error ) goto Exit; | |
| metrics->units_per_em = face->units_per_EM; | |
| af_latin_metrics_init_widths( metrics, face ); | |
| af_latin_metrics_init_blues( metrics, face ); | |
| Exit: | |
| FT_Set_Charmap( face, oldmap ); | |
| return error; | |
| } | |
| static void | |
| af_latin_metrics_scale_dim( AF_LatinMetrics metrics, | |
| AF_Scaler scaler, | |
| AF_Dimension dim ) | |
| { | |
| FT_Fixed scale; | |
| FT_Pos delta; | |
| AF_LatinAxis axis; | |
| FT_UInt nn; | |
| if ( dim == AF_DIMENSION_HORZ ) | |
| { | |
| scale = scaler->x_scale; | |
| delta = scaler->x_delta; | |
| } | |
| else | |
| { | |
| scale = scaler->y_scale; | |
| delta = scaler->y_delta; | |
| } | |
| axis = & metrics->axis[ dim ]; | |
| if ( axis->org_scale == scale && axis->org_delta == delta ) | |
| return; | |
| axis->org_scale = scale; | |
| axis->org_delta = delta; | |
| /* XXX: TODO: Correct Y and X scale according to Chester rules | |
| */ | |
| axis->scale = scale; | |
| axis->delta = delta; | |
| if ( dim == AF_DIMENSION_HORZ ) | |
| { | |
| metrics->root.scaler.x_scale = scale; | |
| metrics->root.scaler.x_delta = delta; | |
| } | |
| else | |
| { | |
| metrics->root.scaler.y_scale = scale; | |
| metrics->root.scaler.y_delta = delta; | |
| } | |
| /* scale the standard widths | |
| */ | |
| for ( nn = 0; nn < axis->width_count; nn++ ) | |
| { | |
| AF_Width width = axis->widths + nn; | |
| width->cur = FT_MulFix( width->org, scale ); | |
| width->fit = width->cur; | |
| } | |
| if ( dim == AF_DIMENSION_VERT ) | |
| { | |
| /* scale the blue zones | |
| */ | |
| for ( nn = 0; nn < axis->blue_count; nn++ ) | |
| { | |
| AF_LatinBlue blue = & axis->blues[nn]; | |
| FT_Pos dist; | |
| blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta; | |
| blue->ref.fit = blue->ref.cur; | |
| blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta; | |
| blue->shoot.fit = blue->shoot.cur; | |
| /* a blue zone is only active when it is less than 3/4 pixels tall | |
| */ | |
| dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale ); | |
| if ( dist >= 48 || dist <= -48 ) | |
| blue->flags |= ~AF_LATIN_BLUE_ACTIVE; | |
| } | |
| } | |
| } | |
| FT_LOCAL_DEF( void ) | |
| af_latin_metrics_scale( AF_LatinMetrics metrics, | |
| AF_Scaler scaler ) | |
| { | |
| af_latin_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ ); | |
| af_latin_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT ); | |
| } | |
| /***************************************************************************/ | |
| /***************************************************************************/ | |
| /***** *****/ | |
| /***** L A T I N G L Y P H A N A L Y S I S *****/ | |
| /***** *****/ | |
| /***************************************************************************/ | |
| /***************************************************************************/ | |
| FT_LOCAL_DEF( void ) | |
| af_latin_hints_compute_segments( AF_GlyphHints hints, | |
| AF_Dimension dim ) | |
| { | |
| AF_AxisHints axis = &hints->axis[dim]; | |
| AF_Segment segments = axis->segments; | |
| AF_Segment segment = segments; | |
| FT_Int num_segments = 0; | |
| AF_Point* contour = hints->contours; | |
| AF_Point* contour_limit = contour + hints->num_contours; | |
| AF_Direction major_dir, segment_dir; | |
| #ifdef AF_HINT_METRICS | |
| AF_Point min_point = 0; | |
| AF_Point max_point = 0; | |
| FT_Pos min_coord = 32000; | |
| FT_Pos max_coord = -32000; | |
| #endif | |
| major_dir = FT_ABS( axis->major_dir ); | |
| segment_dir = major_dir; | |
| /* set up (u,v) in each point */ | |
| if ( dim == AF_DIMENSION_HORZ ) | |
| { | |
| AF_Point point = hints->points; | |
| AF_Point limit = point + hints->num_points; | |
| for ( ; point < limit; point++ ) | |
| { | |
| point->u = point->fx; | |
| point->v = point->fy; | |
| } | |
| } | |
| else | |
| { | |
| AF_Point point = hints->points; | |
| AF_Point limit = point + hints->num_points; | |
| for ( ; point < limit; point++ ) | |
| { | |
| point->u = point->fy; | |
| point->v = point->fx; | |
| } | |
| } | |
| /* do each contour separately */ | |
| for ( ; contour < contour_limit; contour++ ) | |
| { | |
| AF_Point point = contour[0]; | |
| AF_Point last = point->prev; | |
| int on_edge = 0; | |
| FT_Pos min_pos = 32000; /* minimum segment pos != min_coord */ | |
| FT_Pos max_pos = -32000; /* maximum segment pos != max_coord */ | |
| FT_Bool passed; | |
| #ifdef AF_HINT_METRICS | |
| if ( point->u < min_coord ) | |
| { | |
| min_coord = point->u; | |
| min_point = point; | |
| } | |
| if ( point->u > max_coord ) | |
| { | |
| max_coord = point->u; | |
| max_point = point; | |
| } | |
| #endif | |
| if ( point == last ) /* skip singletons -- just in case */ | |
| continue; | |
| if ( FT_ABS( last->out_dir ) == major_dir && | |
| FT_ABS( point->out_dir ) == major_dir ) | |
| { | |
| /* we are already on an edge, try to locate its start */ | |
| last = point; | |
| for (;;) | |
| { | |
| point = point->prev; | |
| if ( FT_ABS( point->out_dir ) != major_dir ) | |
| { | |
| point = point->next; | |
| break; | |
| } | |
| if ( point == last ) | |
| break; | |
| } | |
| } | |
| last = point; | |
| passed = 0; | |
| for (;;) | |
| { | |
| FT_Pos u, v; | |
| if ( on_edge ) | |
| { | |
| u = point->u; | |
| if ( u < min_pos ) | |
| min_pos = u; | |
| if ( u > max_pos ) | |
| max_pos = u; | |
| if ( point->out_dir != segment_dir || point == last ) | |
| { | |
| /* we are just leaving an edge; record a new segment! */ | |
| segment->last = point; | |
| segment->pos = ( min_pos + max_pos ) >> 1; | |
| /* a segment is round if either its first or last point */ | |
| /* is a control point */ | |
| if ( ( segment->first->flags | point->flags ) & | |
| AF_FLAG_CONTROL ) | |
| segment->flags |= AF_EDGE_ROUND; | |
| /* compute segment size */ | |
| min_pos = max_pos = point->v; | |
| v = segment->first->v; | |
| if ( v < min_pos ) | |
| min_pos = v; | |
| if ( v > max_pos ) | |
| max_pos = v; | |
| segment->min_coord = min_pos; | |
| segment->max_coord = max_pos; | |
| on_edge = 0; | |
| num_segments++; | |
| segment++; | |
| /* fallthrough */ | |
| } | |
| } | |
| /* now exit if we are at the start/end point */ | |
| if ( point == last ) | |
| { | |
| if ( passed ) | |
| break; | |
| passed = 1; | |
| } | |
| if ( !on_edge && FT_ABS( point->out_dir ) == major_dir ) | |
| { | |
| /* this is the start of a new segment! */ | |
| segment_dir = point->out_dir; | |
| /* clear all segment fields */ | |
| FT_ZERO( segment ); | |
| segment->dir = segment_dir; | |
| segment->flags = AF_EDGE_NORMAL; | |
| min_pos = max_pos = point->u; | |
| segment->first = point; | |
| segment->last = point; | |
| segment->contour = contour; | |
| segment->score = 32000; | |
| segment->link = NULL; | |
| on_edge = 1; | |
| #ifdef AF_HINT_METRICS | |
| if ( point == max_point ) | |
| max_point = 0; | |
| if ( point == min_point ) | |
| min_point = 0; | |
| #endif | |
| } | |
| point = point->next; | |
| } | |
| } /* contours */ | |
| #ifdef AF_HINT_METRICS | |
| /* we need to ensure that there are edges on the left-most and */ | |
| /* right-most points of the glyph in order to hint the metrics; */ | |
| /* we do this by inserting fake segments when needed */ | |
| if ( dim == AF_DIMENSION_HORZ ) | |
| { | |
| AF_Point point = hints->points; | |
| AF_Point point_limit = point + hints->num_points; | |
| FT_Pos min_pos = 32000; | |
| FT_Pos max_pos = -32000; | |
| min_point = 0; | |
| max_point = 0; | |
| /* compute minimum and maximum points */ | |
| for ( ; point < point_limit; point++ ) | |
| { | |
| FT_Pos x = point->fx; | |
| if ( x < min_pos ) | |
| { | |
| min_pos = x; | |
| min_point = point; | |
| } | |
| if ( x > max_pos ) | |
| { | |
| max_pos = x; | |
| max_point = point; | |
| } | |
| } | |
| /* insert minimum segment */ | |
| if ( min_point ) | |
| { | |
| /* clear all segment fields */ | |
| FT_ZERO( segment ); | |
| segment->dir = segment_dir; | |
| segment->flags = AF_EDGE_NORMAL; | |
| segment->first = min_point; | |
| segment->last = min_point; | |
| segment->pos = min_pos; | |
| segment->score = 32000; | |
| segment->link = NULL; | |
| num_segments++; | |
| segment++; | |
| } | |
| /* insert maximum segment */ | |
| if ( max_point ) | |
| { | |
| /* clear all segment fields */ | |
| FT_ZERO( segment ); | |
| segment->dir = segment_dir; | |
| segment->flags = AF_EDGE_NORMAL; | |
| segment->first = max_point; | |
| segment->last = max_point; | |
| segment->pos = max_pos; | |
| segment->score = 32000; | |
| segment->link = NULL; | |
| num_segments++; | |
| segment++; | |
| } | |
| } | |
| #endif /* AF_HINT_METRICS */ | |
| axis->num_segments = num_segments; | |
| } | |
| FT_LOCAL_DEF( void ) | |
| af_latin_hints_link_segments( AF_GlyphHints hints, | |
| AF_Dimension dim ) | |
| { | |
| AF_AxisHints axis = &hints->axis[dim]; | |
| AF_Segment segments = axis->segments; | |
| AF_Segment segment_limit = segments + axis->num_segments; | |
| AF_Direction major_dir = axis->major_dir; | |
| AF_Segment seg1, seg2; | |
| /* now compare each segment to the others */ | |
| for ( seg1 = segments; seg1 < segment_limit; seg1++ ) | |
| { | |
| /* the fake segments are introduced to hint the metrics -- */ | |
| /* we must never link them to anything */ | |
| if ( seg1->first == seg1->last || seg1->dir != major_dir ) | |
| continue; | |
| for ( seg2 = segments; seg2 < segment_limit; seg2++ ) | |
| if ( seg2 != seg1 && seg1->dir + seg2->dir == 0 ) | |
| { | |
| FT_Pos pos1 = seg1->pos; | |
| FT_Pos pos2 = seg2->pos; | |
| FT_Pos dist = pos2 - pos1; | |
| if ( dist < 0 ) | |
| continue; | |
| { | |
| FT_Pos min = seg1->min_coord; | |
| FT_Pos max = seg1->max_coord; | |
| FT_Pos len, score; | |
| if ( min < seg2->min_coord ) | |
| min = seg2->min_coord; | |
| if ( max > seg2->max_coord ) | |
| max = seg2->max_coord; | |
| len = max - min; | |
| if ( len >= 8 ) | |
| { | |
| score = dist + 3000 / len; | |
| if ( score < seg1->score ) | |
| { | |
| seg1->score = score; | |
| seg1->link = seg2; | |
| } | |
| if ( score < seg2->score ) | |
| { | |
| seg2->score = score; | |
| seg2->link = seg1; | |
| } | |
| } | |
| } | |
| } | |
| } | |
| /* now, compute the `serif' segments */ | |
| for ( seg1 = segments; seg1 < segment_limit; seg1++ ) | |
| { | |
| seg2 = seg1->link; | |
| if ( seg2 ) | |
| { | |
| seg2->num_linked++; | |
| if ( seg2->link != seg1 ) | |
| { | |
| seg1->link = 0; | |
| seg1->serif = seg2->link; | |
| } | |
| } | |
| } | |
| } | |
| FT_LOCAL_DEF( void ) | |
| af_latin_hints_compute_edges( AF_GlyphHints hints, | |
| AF_Dimension dim ) | |
| { | |
| AF_AxisHints axis = &hints->axis[dim]; | |
| AF_Edge edges = axis->edges; | |
| AF_Edge edge, edge_limit; | |
| AF_Segment segments = axis->segments; | |
| AF_Segment segment_limit = segments + axis->num_segments; | |
| AF_Segment seg; | |
| AF_Direction up_dir; | |
| FT_Fixed scale; | |
| FT_Pos edge_distance_threshold; | |
| scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale | |
| : hints->y_scale; | |
| up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP | |
| : AF_DIR_RIGHT; | |
| /*********************************************************************/ | |
| /* */ | |
| /* We will begin by generating a sorted table of edges for the */ | |
| /* current direction. To do so, we simply scan each segment and try */ | |
| /* to find an edge in our table that corresponds to its position. */ | |
| /* */ | |
| /* If no edge is found, we create and insert a new edge in the */ | |
| /* sorted table. Otherwise, we simply add the segment to the edge's */ | |
| /* list which will be processed in the second step to compute the */ | |
| /* edge's properties. */ | |
| /* */ | |
| /* Note that the edges table is sorted along the segment/edge */ | |
| /* position. */ | |
| /* */ | |
| /*********************************************************************/ | |
| edge_distance_threshold = FT_MulFix( hints->edge_distance_threshold, | |
| scale ); | |
| if ( edge_distance_threshold > 64 / 4 ) | |
| edge_distance_threshold = 64 / 4; | |
| edge_distance_threshold = FT_DivFix( edge_distance_threshold, | |
| scale ); | |
| edge_limit = edges; | |
| for ( seg = segments; seg < segment_limit; seg++ ) | |
| { | |
| AF_Edge found = 0; | |
| /* look for an edge corresponding to the segment */ | |
| for ( edge = edges; edge < edge_limit; edge++ ) | |
| { | |
| FT_Pos dist; | |
| dist = seg->pos - edge->fpos; | |
| if ( dist < 0 ) | |
| dist = -dist; | |
| if ( dist < edge_distance_threshold ) | |
| { | |
| found = edge; | |
| break; | |
| } | |
| } | |
| if ( !found ) | |
| { | |
| /* insert a new edge in the list and */ | |
| /* sort according to the position */ | |
| while ( edge > edges && edge[-1].fpos > seg->pos ) | |
| { | |
| edge[0] = edge[-1]; | |
| edge--; | |
| } | |
| edge_limit++; | |
| /* clear all edge fields */ | |
| FT_ZERO( edge ); | |
| /* add the segment to the new edge's list */ | |
| edge->first = seg; | |
| edge->last = seg; | |
| edge->fpos = seg->pos; | |
| edge->opos = edge->pos = FT_MulFix( seg->pos, scale ); | |
| seg->edge_next = seg; | |
| } | |
| else | |
| { | |
| /* if an edge was found, simply add the segment to the edge's */ | |
| /* list */ | |
| seg->edge_next = edge->first; | |
| edge->last->edge_next = seg; | |
| edge->last = seg; | |
| } | |
| } | |
| axis->num_edges = (FT_Int)( edge_limit - edges ); | |
| /*********************************************************************/ | |
| /* */ | |
| /* Good, we will now compute each edge's properties according to */ | |
| /* segments found on its position. Basically, these are: */ | |
| /* */ | |
| /* - edge's main direction */ | |
| /* - stem edge, serif edge or both (which defaults to stem then) */ | |
| /* - rounded edge, straight or both (which defaults to straight) */ | |
| /* - link for edge */ | |
| /* */ | |
| /*********************************************************************/ | |
| /* first of all, set the `edge' field in each segment -- this is */ | |
| /* required in order to compute edge links */ | |
| /* Note that I've tried to remove this loop, setting | |
| * the "edge" field of each segment directly in the | |
| * code above. For some reason, it slows down execution | |
| * speed -- on a Sun. | |
| */ | |
| for ( edge = edges; edge < edge_limit; edge++ ) | |
| { | |
| seg = edge->first; | |
| if ( seg ) | |
| do | |
| { | |
| seg->edge = edge; | |
| seg = seg->edge_next; | |
| } | |
| while ( seg != edge->first ); | |
| } | |
| /* now, compute each edge properties */ | |
| for ( edge = edges; edge < edge_limit; edge++ ) | |
| { | |
| FT_Int is_round = 0; /* does it contain round segments? */ | |
| FT_Int is_straight = 0; /* does it contain straight segments? */ | |
| FT_Pos ups = 0; /* number of upwards segments */ | |
| FT_Pos downs = 0; /* number of downwards segments */ | |
| seg = edge->first; | |
| do | |
| { | |
| FT_Bool is_serif; | |
| /* check for roundness of segment */ | |
| if ( seg->flags & AF_EDGE_ROUND ) | |
| is_round++; | |
| else | |
| is_straight++; | |
| /* check for segment direction */ | |
| if ( seg->dir == up_dir ) | |
| ups += seg->max_coord-seg->min_coord; | |
| else | |
| downs += seg->max_coord-seg->min_coord; | |
| /* check for links -- if seg->serif is set, then seg->link must */ | |
| /* be ignored */ | |
| is_serif = (FT_Bool)( seg->serif && seg->serif->edge != edge ); | |
| if ( seg->link || is_serif ) | |
| { | |
| AF_Edge edge2; | |
| AF_Segment seg2; | |
| edge2 = edge->link; | |
| seg2 = seg->link; | |
| if ( is_serif ) | |
| { | |
| seg2 = seg->serif; | |
| edge2 = edge->serif; | |
| } | |
| if ( edge2 ) | |
| { | |
| FT_Pos edge_delta; | |
| FT_Pos seg_delta; | |
| edge_delta = edge->fpos - edge2->fpos; | |
| if ( edge_delta < 0 ) | |
| edge_delta = -edge_delta; | |
| seg_delta = seg->pos - seg2->pos; | |
| if ( seg_delta < 0 ) | |
| seg_delta = -seg_delta; | |
| if ( seg_delta < edge_delta ) | |
| edge2 = seg2->edge; | |
| } | |
| else | |
| edge2 = seg2->edge; | |
| if ( is_serif ) | |
| { | |
| edge->serif = edge2; | |
| edge2->flags |= AF_EDGE_SERIF; | |
| } | |
| else | |
| edge->link = edge2; | |
| } | |
| seg = seg->edge_next; | |
| } while ( seg != edge->first ); | |
| /* set the round/straight flags */ | |
| edge->flags = AF_EDGE_NORMAL; | |
| if ( is_round > 0 && is_round >= is_straight ) | |
| edge->flags |= AF_EDGE_ROUND; | |
| /* set the edge's main direction */ | |
| edge->dir = AF_DIR_NONE; | |
| if ( ups > downs ) | |
| edge->dir = up_dir; | |
| else if ( ups < downs ) | |
| edge->dir = -up_dir; | |
| else if ( ups == downs ) | |
| edge->dir = 0; /* both up and down! */ | |
| /* gets rid of serifs if link is set */ | |
| /* XXX: This gets rid of many unpleasant artefacts! */ | |
| /* Example: the `c' in cour.pfa at size 13 */ | |
| if ( edge->serif && edge->link ) | |
| edge->serif = 0; | |
| } | |
| } | |
| FT_LOCAL_DEF( void ) | |
| af_latin_hints_detect_features( AF_GlyphHints hints, | |
| AF_Dimension dim ) | |
| { | |
| af_latin_hints_compute_segments( hints, dim ); | |
| af_latin_hints_link_segments ( hints, dim ); | |
| af_latin_hints_compute_edges ( hints, dim ); | |
| } | |
| FT_LOCAL_DEF( void ) | |
| af_latin_hints_compute_blue_edges( AF_GlyphHints hints, | |
| AF_LatinMetrics metrics ) | |
| { | |
| AF_AxisHints axis = &hints->axis[ AF_DIMENSION_VERT ]; | |
| AF_Edge edge = axis->edges; | |
| AF_Edge edge_limit = edge + axis->num_edges; | |
| AF_LatinAxis latin = &metrics->axis[ AF_DIMENSION_VERT ]; | |
| FT_Fixed scale = latin->scale; | |
| /* compute which blue zones are active, i.e. have their scaled */ | |
| /* size < 3/4 pixels */ | |
| /* for each horizontal edge search the blue zone which is closest */ | |
| for ( ; edge < edge_limit; edge++ ) | |
| { | |
| FT_Int bb; | |
| AF_Width best_blue = NULL; | |
| FT_Pos best_dist; /* initial threshold */ | |
| /* compute the initial threshold as a fraction of the EM size */ | |
| best_dist = FT_MulFix( metrics->units_per_em / 40, scale ); | |
| if ( best_dist > 64 / 2 ) | |
| best_dist = 64 / 2; | |
| for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) | |
| { | |
| AF_LatinBlue blue = latin->blues + bb; | |
| FT_Bool is_top_blue, is_major_dir; | |
| /* skip inactive blue zones (i.e. those that are too small | |
| */ | |
| if ( !(blue->flags & AF_LATIN_BLUE_ACTIVE) ) | |
| continue; | |
| /* if it is a top zone, check for right edges -- if it is a bottom */ | |
| /* zone, check for left edges */ | |
| /* */ | |
| /* of course, that's for TrueType */ | |
| is_top_blue = (blue->flags & AF_LATIN_BLUE_TOP) != 0; | |
| is_major_dir = FT_BOOL( edge->dir == axis->major_dir ); | |
| /* if it is a top zone, the edge must be against the major */ | |
| /* direction; if it is a bottom zone, it must be in the major */ | |
| /* direction */ | |
| if ( is_top_blue ^ is_major_dir ) | |
| { | |
| FT_Pos dist; | |
| /* first of all, compare it to the reference position */ | |
| dist = edge->fpos - blue->ref.org; | |
| if ( dist < 0 ) | |
| dist = -dist; | |
| dist = FT_MulFix( dist, scale ); | |
| if ( dist < best_dist ) | |
| { | |
| best_dist = dist; | |
| best_blue = & blue->ref; | |
| } | |
| /* now, compare it to the overshoot position if the edge is */ | |
| /* rounded, and if the edge is over the reference position of a */ | |
| /* top zone, or under the reference position of a bottom zone */ | |
| if ( edge->flags & AF_EDGE_ROUND && dist != 0 ) | |
| { | |
| FT_Bool is_under_ref = FT_BOOL( edge->fpos < blue->ref.org ); | |
| if ( is_top_blue ^ is_under_ref ) | |
| { | |
| blue = latin->blues + bb; | |
| dist = edge->fpos - blue->shoot.org; | |
| if ( dist < 0 ) | |
| dist = -dist; | |
| dist = FT_MulFix( dist, scale ); | |
| if ( dist < best_dist ) | |
| { | |
| best_dist = dist; | |
| best_blue = & blue->shoot; | |
| } | |
| } | |
| } | |
| } | |
| } | |
| if ( best_blue ) | |
| edge->blue_edge = best_blue; | |
| } | |
| } | |
| static FT_Error | |
| af_latin_hints_init( AF_GlyphHints hints, | |
| FT_Outline* outline, | |
| AF_LatinMetrics metrics ) | |
| { | |
| FT_Error error; | |
| FT_Render_Mode mode; | |
| error = af_glyph_hints_reset( hints, &metrics->root.scaler, | |
| (AF_ScriptMetrics) metrics, | |
| outline ); | |
| if (error) | |
| goto Exit; | |
| /* compute flags depending on render mode, etc... | |
| */ | |
| mode = metrics->root.scaler.render_mode; | |
| /* we snap the width of vertical stems for the monochrome and | |
| * horizontal LCD rendering targets only. | |
| */ | |
| if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD ) | |
| hints->other_flags |= AF_LATIN_HINTS_HORZ_SNAP; | |
| /* we snap the width of horizontal stems for the monochrome and | |
| * vertical LCD rendering targets only. | |
| */ | |
| if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V ) | |
| hints->other_flags |= AF_LATIN_HINTS_VERT_SNAP; | |
| /* XXX | |
| */ | |
| if ( mode != FT_RENDER_MODE_LIGHT ) | |
| hints->other_flags |= AF_LATIN_HINTS_STEM_ADJUST; | |
| if ( mode == FT_RENDER_MODE_MONO ) | |
| hints->other_flags |= AF_LATIN_HINTS_MONO; | |
| /* analyze glyph outline | |
| */ | |
| if ( AF_HINTS_DO_HORIZONTAL(hints) ) | |
| af_latin_hints_detect_features( hints, AF_DIMENSION_HORZ ); | |
| if ( AF_HINTS_DO_VERTICAL(hints) ) | |
| { | |
| af_latin_hints_detect_features( hints, AF_DIMENSION_VERT ); | |
| af_latin_hints_compute_blue_edges( hints, metrics ); | |
| } | |
| Exit: | |
| return error; | |
| } | |
| /***************************************************************************/ | |
| /***************************************************************************/ | |
| /***** *****/ | |
| /***** L A T I N G L Y P H G R I D - F I T T I N G *****/ | |
| /***** *****/ | |
| /***************************************************************************/ | |
| /***************************************************************************/ | |
| /* snap a given width in scaled coordinates to one of the */ | |
| /* current standard widths */ | |
| static FT_Pos | |
| af_latin_snap_width( AF_Width widths, | |
| FT_Int count, | |
| FT_Pos width ) | |
| { | |
| int n; | |
| FT_Pos best = 64 + 32 + 2; | |
| FT_Pos reference = width; | |
| FT_Pos scaled; | |
| for ( n = 0; n < count; n++ ) | |
| { | |
| FT_Pos w; | |
| FT_Pos dist; | |
| w = widths[n].cur; | |
| dist = width - w; | |
| if ( dist < 0 ) | |
| dist = -dist; | |
| if ( dist < best ) | |
| { | |
| best = dist; | |
| reference = w; | |
| } | |
| } | |
| scaled = FT_PIX_ROUND( reference ); | |
| if ( width >= reference ) | |
| { | |
| if ( width < scaled + 48 ) | |
| width = reference; | |
| } | |
| else | |
| { | |
| if ( width > scaled - 48 ) | |
| width = reference; | |
| } | |
| return width; | |
| } | |
| /* compute the snapped width of a given stem */ | |
| static FT_Pos | |
| af_latin_compute_stem_width( AF_GlyphHints hints, | |
| AF_Dimension dim, | |
| FT_Pos width, | |
| AF_Edge_Flags base_flags, | |
| AF_Edge_Flags stem_flags ) | |
| { | |
| AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics; | |
| AF_LatinAxis axis = & metrics->axis[ dim ]; | |
| FT_Pos dist = width; | |
| FT_Int sign = 0; | |
| FT_Int vertical = AF_HINTS_DO_VERTICAL( hints ); | |
| if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) | |
| return width; | |
| if ( dist < 0 ) | |
| { | |
| dist = -width; | |
| sign = 1; | |
| } | |
| if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) || | |
| ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ) | |
| { | |
| /* smooth hinting process: very lightly quantize the stem width */ | |
| /* */ | |
| /* leave the widths of serifs alone */ | |
| if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) ) | |
| goto Done_Width; | |
| else if ( ( base_flags & AF_EDGE_ROUND ) ) | |
| { | |
| if ( dist < 80 ) | |
| dist = 64; | |
| } | |
| else if ( dist < 56 ) | |
| dist = 56; | |
| if ( axis->width_count > 0 ) | |
| { | |
| FT_Pos delta; | |
| /* compare to standard width | |
| */ | |
| if ( axis->width_count > 0 ) | |
| { | |
| delta = dist - axis->widths[0].cur; | |
| if ( delta < 0 ) | |
| delta = -delta; | |
| if ( delta < 40 ) | |
| { | |
| dist = axis->widths[ 0 ].cur; | |
| if ( dist < 48 ) | |
| dist = 48; | |
| goto Done_Width; | |
| } | |
| } | |
| if ( dist < 3 * 64 ) | |
| { | |
| delta = dist & 63; | |
| dist &= -64; | |
| if ( delta < 10 ) | |
| dist += delta; | |
| else if ( delta < 32 ) | |
| dist += 10; | |
| else if ( delta < 54 ) | |
| dist += 54; | |
| else | |
| dist += delta; | |
| } | |
| else | |
| dist = ( dist + 32 ) & ~63; | |
| } | |
| } | |
| else | |
| { | |
| /* strong hinting process: snap the stem width to integer pixels */ | |
| /* */ | |
| dist = af_latin_snap_width( axis->widths, axis->width_count, dist ); | |
| if ( vertical ) | |
| { | |
| /* in the case of vertical hinting, always round */ | |
| /* the stem heights to integer pixels */ | |
| if ( dist >= 64 ) | |
| dist = ( dist + 16 ) & ~63; | |
| else | |
| dist = 64; | |
| } | |
| else | |
| { | |
| if ( AF_LATIN_HINTS_DO_MONO( hints ) ) | |
| { | |
| /* monochrome horizontal hinting: snap widths to integer pixels */ | |
| /* with a different threshold */ | |
| if ( dist < 64 ) | |
| dist = 64; | |
| else | |
| dist = ( dist + 32 ) & ~63; | |
| } | |
| else | |
| { | |
| /* for horizontal anti-aliased hinting, we adopt a more subtle */ | |
| /* approach: we strengthen small stems, round stems whose size */ | |
| /* is between 1 and 2 pixels to an integer, otherwise nothing */ | |
| if ( dist < 48 ) | |
| dist = ( dist + 64 ) >> 1; | |
| else if ( dist < 128 ) | |
| dist = ( dist + 22 ) & ~63; | |
| else | |
| /* round otherwise to prevent color fringes in LCD mode */ | |
| dist = ( dist + 32 ) & ~63; | |
| } | |
| } | |
| } | |
| Done_Width: | |
| if ( sign ) | |
| dist = -dist; | |
| return dist; | |
| } | |
| /* align one stem edge relative to the previous stem edge */ | |
| static void | |
| af_latin_align_linked_edge( AF_GlyphHints hints, | |
| AF_Dimension dim, | |
| AF_Edge base_edge, | |
| AF_Edge stem_edge ) | |
| { | |
| FT_Pos dist = stem_edge->opos - base_edge->opos; | |
| FT_Pos fitted_width = af_latin_compute_stem_width( hints, | |
| dim, | |
| dist, | |
| base_edge->flags, | |
| stem_edge->flags ); | |
| stem_edge->pos = base_edge->pos + fitted_width; | |
| } | |
| static void | |
| af_latin_align_serif_edge( AF_GlyphHints hints, | |
| AF_Edge base, | |
| AF_Edge serif ) | |
| { | |
| FT_UNUSED( hints ); | |
| serif->pos = base->pos + (serif->opos - base->opos); | |
| } | |
| /*************************************************************************/ | |
| /*************************************************************************/ | |
| /*************************************************************************/ | |
| /**** ****/ | |
| /**** E D G E H I N T I N G ****/ | |
| /**** ****/ | |
| /*************************************************************************/ | |
| /*************************************************************************/ | |
| /*************************************************************************/ | |
| FT_LOCAL_DEF( void ) | |
| af_latin_hint_edges( AF_GlyphHints hints, | |
| AF_Dimension dim ) | |
| { | |
| AF_AxisHints axis = & hints->axis[dim]; | |
| AF_Edge edges = axis->edges; | |
| AF_Edge edge_limit = edges + axis->num_edges; | |
| FT_Int n_edges; | |
| AF_Edge edge; | |
| AF_Edge anchor = 0; | |
| FT_Int has_serifs = 0; | |
| /* we begin by aligning all stems relative to the blue zone */ | |
| /* if needed -- that's only for horizontal edges */ | |
| if ( dim == AF_DIMENSION_VERT ) | |
| { | |
| for ( edge = edges; edge < edge_limit; edge++ ) | |
| { | |
| AF_Width blue; | |
| AF_Edge edge1, edge2; | |
| if ( edge->flags & AF_EDGE_DONE ) | |
| continue; | |
| blue = edge->blue_edge; | |
| edge1 = NULL; | |
| edge2 = edge->link; | |
| if ( blue ) | |
| { | |
| edge1 = edge; | |
| } | |
| else if ( edge2 && edge2->blue_edge ) | |
| { | |
| blue = edge2->blue_edge; | |
| edge1 = edge2; | |
| edge2 = edge; | |
| } | |
| if ( !edge1 ) | |
| continue; | |
| edge1->pos = blue->fit; | |
| edge1->flags |= AF_EDGE_DONE; | |
| if ( edge2 && !edge2->blue_edge ) | |
| { | |
| af_latin_align_linked_edge( hints, dim, edge1, edge2 ); | |
| edge2->flags |= AF_EDGE_DONE; | |
| } | |
| if ( !anchor ) | |
| anchor = edge; | |
| } | |
| } | |
| /* now we will align all stem edges, trying to maintain the */ | |
| /* relative order of stems in the glyph */ | |
| for ( edge = edges; edge < edge_limit; edge++ ) | |
| { | |
| AF_Edge edge2; | |
| if ( edge->flags & AF_EDGE_DONE ) | |
| continue; | |
| /* skip all non-stem edges */ | |
| edge2 = edge->link; | |
| if ( !edge2 ) | |
| { | |
| has_serifs++; | |
| continue; | |
| } | |
| /* now align the stem */ | |
| /* this should not happen, but it's better to be safe */ | |
| if ( edge2->blue_edge || edge2 < edge ) | |
| { | |
| af_latin_align_linked_edge( hints, dim, edge2, edge ); | |
| edge->flags |= AF_EDGE_DONE; | |
| continue; | |
| } | |
| if ( !anchor ) | |
| { | |
| FT_Pos org_len, org_center, cur_len; | |
| FT_Pos cur_pos1, error1, error2, u_off, d_off; | |
| org_len = edge2->opos - edge->opos; | |
| cur_len = af_latin_compute_stem_width( hints, dim, org_len, | |
| edge->flags, edge2->flags ); | |
| if ( cur_len <= 64 ) | |
| u_off = d_off = 32; | |
| else | |
| { | |
| u_off = 38; | |
| d_off = 26; | |
| } | |
| if ( cur_len < 96 ) | |
| { | |
| org_center = edge->opos + ( org_len >> 1 ); | |
| cur_pos1 = FT_PIX_ROUND( org_center ); | |
| error1 = org_center - ( cur_pos1 - u_off ); | |
| if ( error1 < 0 ) | |
| error1 = -error1; | |
| error2 = org_center - ( cur_pos1 + d_off ); | |
| if ( error2 < 0 ) | |
| error2 = -error2; | |
| if ( error1 < error2 ) | |
| cur_pos1 -= u_off; | |
| else | |
| cur_pos1 += d_off; | |
| edge->pos = cur_pos1 - cur_len / 2; | |
| edge2->pos = cur_pos1 + cur_len / 2; | |
| } | |
| else | |
| edge->pos = FT_PIX_ROUND( edge->opos ); | |
| anchor = edge; | |
| edge->flags |= AF_EDGE_DONE; | |
| af_latin_align_linked_edge( hints, dim, edge, edge2 ); | |
| } | |
| else | |
| { | |
| FT_Pos org_pos, org_len, org_center, cur_len; | |
| FT_Pos cur_pos1, cur_pos2, delta1, delta2; | |
| org_pos = anchor->pos + ( edge->opos - anchor->opos ); | |
| org_len = edge2->opos - edge->opos; | |
| org_center = org_pos + ( org_len >> 1 ); | |
| cur_len = af_latin_compute_stem_width( hints, dim, org_len, | |
| edge->flags, edge2->flags ); | |
| if ( cur_len < 96 ) | |
| { | |
| FT_Pos u_off, d_off; | |
| cur_pos1 = FT_PIX_ROUND( org_center ); | |
| if (cur_len <= 64 ) | |
| u_off = d_off = 32; | |
| else | |
| { | |
| u_off = 38; | |
| d_off = 26; | |
| } | |
| delta1 = org_center - ( cur_pos1 - u_off ); | |
| if ( delta1 < 0 ) | |
| delta1 = -delta1; | |
| delta2 = org_center - ( cur_pos1 + d_off ); | |
| if ( delta2 < 0 ) | |
| delta2 = -delta2; | |
| if ( delta1 < delta2 ) | |
| cur_pos1 -= u_off; | |
| else | |
| cur_pos1 += d_off; | |
| edge->pos = cur_pos1 - cur_len / 2; | |
| edge2->pos = cur_pos1 + cur_len / 2; | |
| } | |
| else | |
| { | |
| org_pos = anchor->pos + ( edge->opos - anchor->opos ); | |
| org_len = edge2->opos - edge->opos; | |
| org_center = org_pos + ( org_len >> 1 ); | |
| cur_len = af_latin_compute_stem_width( hints, dim, org_len, | |
| edge->flags, edge2->flags ); | |
| cur_pos1 = FT_PIX_ROUND( org_pos ); | |
| delta1 = ( cur_pos1 + ( cur_len >> 1 ) - org_center ); | |
| if ( delta1 < 0 ) | |
| delta1 = -delta1; | |
| cur_pos2 = FT_PIX_ROUND( org_pos + org_len ) - cur_len; | |
| delta2 = ( cur_pos2 + ( cur_len >> 1 ) - org_center ); | |
| if ( delta2 < 0 ) | |
| delta2 = -delta2; | |
| edge->pos = ( delta1 < delta2 ) ? cur_pos1 : cur_pos2; | |
| edge2->pos = edge->pos + cur_len; | |
| } | |
| edge->flags |= AF_EDGE_DONE; | |
| edge2->flags |= AF_EDGE_DONE; | |
| if ( edge > edges && edge->pos < edge[-1].pos ) | |
| edge->pos = edge[-1].pos; | |
| } | |
| } | |
| /* make sure that lowercase m's maintain their symmetry */ | |
| /* In general, lowercase m's have six vertical edges if they are sans */ | |
| /* serif, or twelve if they are avec serif. This implementation is */ | |
| /* based on that assumption, and seems to work very well with most */ | |
| /* faces. However, if for a certain face this assumption is not */ | |
| /* true, the m is just rendered like before. In addition, any stem */ | |
| /* correction will only be applied to symmetrical glyphs (even if the */ | |
| /* glyph is not an m), so the potential for unwanted distortion is */ | |
| /* relatively low. */ | |
| /* We don't handle horizontal edges since we can't easily assure that */ | |
| /* the third (lowest) stem aligns with the base line; it might end up */ | |
| /* one pixel higher or lower. */ | |
| n_edges = edge_limit - edges; | |
| if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) ) | |
| { | |
| AF_Edge edge1, edge2, edge3; | |
| FT_Pos dist1, dist2, span, delta; | |
| if ( n_edges == 6 ) | |
| { | |
| edge1 = edges; | |
| edge2 = edges + 2; | |
| edge3 = edges + 4; | |
| } | |
| else | |
| { | |
| edge1 = edges + 1; | |
| edge2 = edges + 5; | |
| edge3 = edges + 9; | |
| } | |
| dist1 = edge2->opos - edge1->opos; | |
| dist2 = edge3->opos - edge2->opos; | |
| span = dist1 - dist2; | |
| if ( span < 0 ) | |
| span = -span; | |
| if ( span < 8 ) | |
| { | |
| delta = edge3->pos - ( 2 * edge2->pos - edge1->pos ); | |
| edge3->pos -= delta; | |
| if ( edge3->link ) | |
| edge3->link->pos -= delta; | |
| /* move the serifs along with the stem */ | |
| if ( n_edges == 12 ) | |
| { | |
| ( edges + 8 )->pos -= delta; | |
| ( edges + 11 )->pos -= delta; | |
| } | |
| edge3->flags |= AF_EDGE_DONE; | |
| if ( edge3->link ) | |
| edge3->link->flags |= AF_EDGE_DONE; | |
| } | |
| } | |
| if ( has_serifs || !anchor ) | |
| { | |
| /* now hint the remaining edges (serifs and single) in order | |
| * to complete our processing | |
| */ | |
| for ( edge = edges; edge < edge_limit; edge++ ) | |
| { | |
| if ( edge->flags & AF_EDGE_DONE ) | |
| continue; | |
| if ( edge->serif ) | |
| af_latin_align_serif_edge( hints, edge->serif, edge ); | |
| else if ( !anchor ) | |
| { | |
| edge->pos = FT_PIX_ROUND( edge->opos ); | |
| anchor = edge; | |
| } | |
| else | |
| edge->pos = anchor->pos + | |
| FT_PIX_ROUND( edge->opos - anchor->opos ); | |
| edge->flags |= AF_EDGE_DONE; | |
| if ( edge > edges && edge->pos < edge[-1].pos ) | |
| edge->pos = edge[-1].pos; | |
| if ( edge + 1 < edge_limit && | |
| edge[1].flags & AF_EDGE_DONE && | |
| edge->pos > edge[1].pos ) | |
| edge->pos = edge[1].pos; | |
| } | |
| } | |
| } | |
| static FT_Error | |
| af_latin_hints_apply( AF_GlyphHints hints, | |
| FT_Outline* outline, | |
| AF_LatinMetrics metrics ) | |
| { | |
| AF_Dimension dim; | |
| FT_UNUSED( metrics ); | |
| for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) | |
| { | |
| if ( (dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL(hints)) || | |
| (dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL(hints)) ) | |
| { | |
| af_latin_hint_edges( hints, dim ); | |
| af_glyph_hints_align_edge_points( hints, dim ); | |
| af_glyph_hints_align_strong_points( hints, dim ); | |
| af_glyph_hints_align_weak_points( hints, dim ); | |
| } | |
| } | |
| af_glyph_hints_save( hints, outline ); | |
| return 0; | |
| } | |
| /***************************************************************************/ | |
| /***************************************************************************/ | |
| /***** *****/ | |
| /***** L A T I N S C R I P T C L A S S *****/ | |
| /***** *****/ | |
| /***************************************************************************/ | |
| /***************************************************************************/ | |
| static const AF_Script_UniRangeRec af_latin_uniranges[] = | |
| { | |
| { 32, 127 }, /* XXX: TODO: Add new Unicode ranges here !! */ | |
| { 160, 255 }, | |
| { 0, 0 } | |
| }; | |
| FT_LOCAL_DEF( const AF_ScriptClassRec ) af_latin_script_class = | |
| { | |
| AF_SCRIPT_LATIN, | |
| af_latin_uniranges, | |
| sizeof( AF_LatinMetricsRec ), | |
| (AF_Script_InitMetricsFunc) af_latin_metrics_init, | |
| (AF_Script_ScaleMetricsFunc) af_latin_metrics_scale, | |
| (AF_Script_DoneMetricsFunc) NULL, | |
| (AF_Script_InitHintsFunc) af_latin_hints_init, | |
| (AF_Script_ApplyHintsFunc) af_latin_hints_apply | |
| }; | |