/***************************************************************************/ /* */ /* afcjk.c */ /* */ /* Auto-fitter hinting routines for CJK script (body). */ /* */ /* Copyright 2006, 2007, 2008, 2009, 2010 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* This file is part of the FreeType project, and may only be used, */ /* modified, and distributed under the terms of the FreeType project */ /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ /* this file you indicate that you have read the license and */ /* understand and accept it fully. */ /* */ /***************************************************************************/ /* * The algorithm is based on akito's autohint patch, available here: * * http://www.kde.gr.jp/~akito/patch/freetype2/ * */ #include "aftypes.h" #include "aflatin.h" #ifdef AF_CONFIG_OPTION_CJK #include "afcjk.h" #include "aferrors.h" #ifdef AF_USE_WARPER #include "afwarp.h" #endif /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** C J K G L O B A L M E T R I C S *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ FT_LOCAL_DEF( FT_Error ) af_cjk_metrics_init( AF_LatinMetrics metrics, FT_Face face ) { FT_CharMap oldmap = face->charmap; metrics->units_per_em = face->units_per_EM; /* TODO are there blues? */ if ( FT_Select_Charmap( face, FT_ENCODING_UNICODE ) ) face->charmap = NULL; else { /* latin's version would suffice */ af_latin_metrics_init_widths( metrics, face, 0x7530 ); af_latin_metrics_check_digits( metrics, face ); } FT_Set_Charmap( face, oldmap ); return AF_Err_Ok; } static void af_cjk_metrics_scale_dim( AF_LatinMetrics metrics, AF_Scaler scaler, AF_Dimension dim ) { AF_LatinAxis axis; axis = &metrics->axis[dim]; if ( dim == AF_DIMENSION_HORZ ) { axis->scale = scaler->x_scale; axis->delta = scaler->x_delta; } else { axis->scale = scaler->y_scale; axis->delta = scaler->y_delta; } } FT_LOCAL_DEF( void ) af_cjk_metrics_scale( AF_LatinMetrics metrics, AF_Scaler scaler ) { metrics->root.scaler = *scaler; af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ ); af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT ); } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** C J K G L Y P H A N A L Y S I S *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ static FT_Error af_cjk_hints_compute_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; FT_Error error; AF_Segment seg; error = af_latin_hints_compute_segments( hints, dim ); if ( error ) return error; /* a segment is round if it doesn't have successive */ /* on-curve points. */ for ( seg = segments; seg < segment_limit; seg++ ) { AF_Point pt = seg->first; AF_Point last = seg->last; AF_Flags f0 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL); AF_Flags f1; seg->flags &= ~AF_EDGE_ROUND; for ( ; pt != last; f0 = f1 ) { pt = pt->next; f1 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL); if ( !f0 && !f1 ) break; if ( pt == last ) seg->flags |= AF_EDGE_ROUND; } } return AF_Err_Ok; } static void af_cjk_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; FT_Pos len_threshold; FT_Pos dist_threshold; len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 ); dist_threshold = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale : hints->y_scale; dist_threshold = FT_DivFix( 64 * 3, dist_threshold ); /* now compare each segment to the others */ for ( seg1 = segments; seg1 < segment_limit; seg1++ ) { /* the fake segments are for metrics hinting only */ if ( seg1->first == seg1->last ) continue; if ( seg1->dir != major_dir ) continue; for ( seg2 = segments; seg2 < segment_limit; seg2++ ) if ( seg2 != seg1 && seg1->dir + seg2->dir == 0 ) { FT_Pos dist = seg2->pos - seg1->pos; if ( dist < 0 ) continue; { FT_Pos min = seg1->min_coord; FT_Pos max = seg1->max_coord; FT_Pos len; if ( min < seg2->min_coord ) min = seg2->min_coord; if ( max > seg2->max_coord ) max = seg2->max_coord; len = max - min; if ( len >= len_threshold ) { if ( dist * 8 < seg1->score * 9 && ( dist * 8 < seg1->score * 7 || seg1->len < len ) ) { seg1->score = dist; seg1->len = len; seg1->link = seg2; } if ( dist * 8 < seg2->score * 9 && ( dist * 8 < seg2->score * 7 || seg2->len < len ) ) { seg2->score = dist; seg2->len = len; seg2->link = seg1; } } } } } /* * now compute the `serif' segments * * In Hanzi, some strokes are wider on one or both of the ends. * We either identify the stems on the ends as serifs or remove * the linkage, depending on the length of the stems. * */ { AF_Segment link1, link2; for ( seg1 = segments; seg1 < segment_limit; seg1++ ) { link1 = seg1->link; if ( !link1 || link1->link != seg1 || link1->pos <= seg1->pos ) continue; if ( seg1->score >= dist_threshold ) continue; for ( seg2 = segments; seg2 < segment_limit; seg2++ ) { if ( seg2->pos > seg1->pos || seg1 == seg2 ) continue; link2 = seg2->link; if ( !link2 || link2->link != seg2 || link2->pos < link1->pos ) continue; if ( seg1->pos == seg2->pos && link1->pos == link2->pos ) continue; if ( seg2->score <= seg1->score || seg1->score * 4 <= seg2->score ) continue; /* seg2 < seg1 < link1 < link2 */ if ( seg1->len >= seg2->len * 3 ) { AF_Segment seg; for ( seg = segments; seg < segment_limit; seg++ ) { AF_Segment link = seg->link; if ( link == seg2 ) { seg->link = 0; seg->serif = link1; } else if ( link == link2 ) { seg->link = 0; seg->serif = seg1; } } } else { seg1->link = link1->link = 0; break; } } } } for ( seg1 = segments; seg1 < segment_limit; seg1++ ) { seg2 = seg1->link; if ( seg2 ) { seg2->num_linked++; if ( seg2->link != seg1 ) { seg1->link = 0; if ( seg2->score < dist_threshold || seg1->score < seg2->score * 4 ) seg1->serif = seg2->link; else seg2->num_linked--; } } } } static FT_Error af_cjk_hints_compute_edges( AF_GlyphHints hints, AF_Dimension dim ) { AF_AxisHints axis = &hints->axis[dim]; FT_Error error = AF_Err_Ok; FT_Memory memory = hints->memory; AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim]; AF_Segment segments = axis->segments; AF_Segment segment_limit = segments + axis->num_segments; AF_Segment seg; FT_Fixed scale; FT_Pos edge_distance_threshold; axis->num_edges = 0; scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale : hints->y_scale; /*********************************************************************/ /* */ /* We 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 is then 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( laxis->edge_distance_threshold, scale ); if ( edge_distance_threshold > 64 / 4 ) edge_distance_threshold = FT_DivFix( 64 / 4, scale ); else edge_distance_threshold = laxis->edge_distance_threshold; for ( seg = segments; seg < segment_limit; seg++ ) { AF_Edge found = 0; FT_Pos best = 0xFFFFU; FT_Int ee; /* look for an edge corresponding to the segment */ for ( ee = 0; ee < axis->num_edges; ee++ ) { AF_Edge edge = axis->edges + ee; FT_Pos dist; if ( edge->dir != seg->dir ) continue; dist = seg->pos - edge->fpos; if ( dist < 0 ) dist = -dist; if ( dist < edge_distance_threshold && dist < best ) { AF_Segment link = seg->link; /* check whether all linked segments of the candidate edge */ /* can make a single edge. */ if ( link ) { AF_Segment seg1 = edge->first; AF_Segment link1; FT_Pos dist2 = 0; do { link1 = seg1->link; if ( link1 ) { dist2 = AF_SEGMENT_DIST( link, link1 ); if ( dist2 >= edge_distance_threshold ) break; } } while ( ( seg1 = seg1->edge_next ) != edge->first ); if ( dist2 >= edge_distance_threshold ) continue; } best = dist; found = edge; } } if ( !found ) { AF_Edge edge; /* insert a new edge in the list and */ /* sort according to the position */ error = af_axis_hints_new_edge( axis, seg->pos, (AF_Direction)seg->dir, memory, &edge ); if ( error ) goto Exit; /* add the segment to the new edge's list */ FT_ZERO( edge ); edge->first = seg; edge->last = seg; edge->fpos = seg->pos; edge->opos = edge->pos = FT_MulFix( seg->pos, scale ); seg->edge_next = seg; edge->dir = seg->dir; } else { /* if an edge was found, simply add the segment to the edge's */ /* list */ seg->edge_next = found->first; found->last->edge_next = seg; found->last = seg; } } /*********************************************************************/ /* */ /* Good, we now compute each edge's properties according to segments */ /* found on its position. Basically, these are as follows. */ /* */ /* - 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 removing this loop and setting the `edge' field of each */ /* segment directly in the code above slows down execution speed for */ /* some reasons on platforms like the Sun. */ { AF_Edge edges = axis->edges; AF_Edge edge_limit = edges + axis->num_edges; AF_Edge edge; 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? */ 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 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 = AF_SEGMENT_DIST( seg, seg2 ); 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; /* get 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; } } Exit: return error; } static FT_Error af_cjk_hints_detect_features( AF_GlyphHints hints, AF_Dimension dim ) { FT_Error error; error = af_cjk_hints_compute_segments( hints, dim ); if ( !error ) { af_cjk_hints_link_segments( hints, dim ); error = af_cjk_hints_compute_edges( hints, dim ); } return error; } FT_LOCAL_DEF( FT_Error ) af_cjk_hints_init( AF_GlyphHints hints, AF_LatinMetrics metrics ) { FT_Render_Mode mode; FT_UInt32 scaler_flags, other_flags; af_glyph_hints_rescale( hints, (AF_ScriptMetrics)metrics ); /* * correct x_scale and y_scale when needed, since they may have * been modified af_cjk_scale_dim above */ hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale; hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta; hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale; hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta; /* compute flags depending on render mode, etc. */ mode = metrics->root.scaler.render_mode; #ifdef AF_USE_WARPER if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V ) metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL; #endif scaler_flags = hints->scaler_flags; other_flags = 0; /* * 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 ) 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 ) other_flags |= AF_LATIN_HINTS_VERT_SNAP; /* * We adjust stems to full pixels only if we don't use the `light' mode. */ if ( mode != FT_RENDER_MODE_LIGHT ) other_flags |= AF_LATIN_HINTS_STEM_ADJUST; if ( mode == FT_RENDER_MODE_MONO ) other_flags |= AF_LATIN_HINTS_MONO; scaler_flags |= AF_SCALER_FLAG_NO_ADVANCE; hints->scaler_flags = scaler_flags; hints->other_flags = other_flags; return 0; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** C J K 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_cjk_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_cjk_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 = ( dim == AF_DIMENSION_VERT ); FT_UNUSED( base_flags ); FT_UNUSED( stem_flags ); 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 */ if ( axis->width_count > 0 ) { if ( FT_ABS( dist - axis->widths[0].cur ) < 40 ) { dist = axis->widths[0].cur; if ( dist < 48 ) dist = 48; goto Done_Width; } } if ( dist < 54 ) dist += ( 54 - dist ) / 2 ; else if ( dist < 3 * 64 ) { FT_Pos delta; delta = dist & 63; dist &= -64; if ( delta < 10 ) dist += delta; else if ( delta < 22 ) dist += 10; else if ( delta < 42 ) dist += delta; else if ( delta < 54 ) dist += 54; else dist += delta; } } else { /* strong hinting process: snap the stem width to integer pixels */ dist = af_cjk_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_cjk_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_cjk_compute_stem_width( hints, dim, dist, (AF_Edge_Flags)base_edge->flags, (AF_Edge_Flags)stem_edge->flags ); stem_edge->pos = base_edge->pos + fitted_width; } static void af_cjk_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 ****/ /**** ****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ #define AF_LIGHT_MODE_MAX_HORZ_GAP 9 #define AF_LIGHT_MODE_MAX_VERT_GAP 15 #define AF_LIGHT_MODE_MAX_DELTA_ABS 14 static FT_Pos af_hint_normal_stem( AF_GlyphHints hints, AF_Edge edge, AF_Edge edge2, FT_Pos anchor, AF_Dimension dim ) { FT_Pos org_len, cur_len, org_center; FT_Pos cur_pos1, cur_pos2; FT_Pos d_off1, u_off1, d_off2, u_off2, delta; FT_Pos offset; FT_Pos threshold = 64; if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) { if ( ( edge->flags & AF_EDGE_ROUND ) && ( edge2->flags & AF_EDGE_ROUND ) ) { if ( dim == AF_DIMENSION_VERT ) threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP; else threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP; } else { if ( dim == AF_DIMENSION_VERT ) threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP / 3; else threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP / 3; } } org_len = edge2->opos - edge->opos; cur_len = af_cjk_compute_stem_width( hints, dim, org_len, (AF_Edge_Flags)edge->flags, (AF_Edge_Flags)edge2->flags ); org_center = ( edge->opos + edge2->opos ) / 2 + anchor; cur_pos1 = org_center - cur_len / 2; cur_pos2 = cur_pos1 + cur_len; d_off1 = cur_pos1 - FT_PIX_FLOOR( cur_pos1 ); d_off2 = cur_pos2 - FT_PIX_FLOOR( cur_pos2 ); u_off1 = 64 - d_off1; u_off2 = 64 - d_off2; delta = 0; if ( d_off1 == 0 || d_off2 == 0 ) goto Exit; if ( cur_len <= threshold ) { if ( d_off2 < cur_len ) { if ( u_off1 <= d_off2 ) delta = u_off1; else delta = -d_off2; } goto Exit; } if ( threshold < 64 ) { if ( d_off1 >= threshold || u_off1 >= threshold || d_off2 >= threshold || u_off2 >= threshold ) goto Exit; } offset = cur_len % 64; if ( offset < 32 ) { if ( u_off1 <= offset || d_off2 <= offset ) goto Exit; } else offset = 64 - threshold; d_off1 = threshold - u_off1; u_off1 = u_off1 - offset; u_off2 = threshold - d_off2; d_off2 = d_off2 - offset; if ( d_off1 <= u_off1 ) u_off1 = -d_off1; if ( d_off2 <= u_off2 ) u_off2 = -d_off2; if ( FT_ABS( u_off1 ) <= FT_ABS( u_off2 ) ) delta = u_off1; else delta = u_off2; Exit: #if 1 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) { if ( delta > AF_LIGHT_MODE_MAX_DELTA_ABS ) delta = AF_LIGHT_MODE_MAX_DELTA_ABS; else if ( delta < -AF_LIGHT_MODE_MAX_DELTA_ABS ) delta = -AF_LIGHT_MODE_MAX_DELTA_ABS; } #endif cur_pos1 += delta; if ( edge->opos < edge2->opos ) { edge->pos = cur_pos1; edge2->pos = cur_pos1 + cur_len; } else { edge->pos = cur_pos1 + cur_len; edge2->pos = cur_pos1; } return delta; } static void af_cjk_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_PtrDist n_edges; AF_Edge edge; AF_Edge anchor = 0; FT_Pos delta = 0; FT_Int skipped = 0; /* now we align all stem edges. */ 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 ) { skipped++; continue; } /* now align the stem */ if ( edge2 < edge ) { af_cjk_align_linked_edge( hints, dim, edge2, edge ); edge->flags |= AF_EDGE_DONE; continue; } if ( dim != AF_DIMENSION_VERT && !anchor ) { #if 0 if ( fixedpitch ) { AF_Edge left = edge; AF_Edge right = edge_limit - 1; AF_EdgeRec left1, left2, right1, right2; FT_Pos target, center1, center2; FT_Pos delta1, delta2, d1, d2; while ( right > left && !right->link ) right--; left1 = *left; left2 = *left->link; right1 = *right->link; right2 = *right; delta = ( ( ( hinter->pp2.x + 32 ) & -64 ) - hinter->pp2.x ) / 2; target = left->opos + ( right->opos - left->opos ) / 2 + delta - 16; delta1 = delta; delta1 += af_hint_normal_stem( hints, left, left->link, delta1, 0 ); if ( left->link != right ) af_hint_normal_stem( hints, right->link, right, delta1, 0 ); center1 = left->pos + ( right->pos - left->pos ) / 2; if ( center1 >= target ) delta2 = delta - 32; else delta2 = delta + 32; delta2 += af_hint_normal_stem( hints, &left1, &left2, delta2, 0 ); if ( delta1 != delta2 ) { if ( left->link != right ) af_hint_normal_stem( hints, &right1, &right2, delta2, 0 ); center2 = left1.pos + ( right2.pos - left1.pos ) / 2; d1 = center1 - target; d2 = center2 - target; if ( FT_ABS( d2 ) < FT_ABS( d1 ) ) { left->pos = left1.pos; left->link->pos = left2.pos; if ( left->link != right ) { right->link->pos = right1.pos; right->pos = right2.pos; } delta1 = delta2; } } delta = delta1; right->link->flags |= AF_EDGE_DONE; right->flags |= AF_EDGE_DONE; } else #endif /* 0 */ delta = af_hint_normal_stem( hints, edge, edge2, 0, AF_DIMENSION_HORZ ); } else af_hint_normal_stem( hints, edge, edge2, delta, dim ); #if 0 printf( "stem (%d,%d) adjusted (%.1f,%.1f)\n", edge - edges, edge2 - edges, ( edge->pos - edge->opos ) / 64.0, ( edge2->pos - edge2->opos ) / 64.0 ); #endif anchor = edge; edge->flags |= AF_EDGE_DONE; edge2->flags |= AF_EDGE_DONE; } /* 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 with serifs. 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; 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 ( edge1->link == edge1 + 1 && edge2->link == edge2 + 1 && edge3->link == edge3 + 1 && 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 ( !skipped ) return; /* * 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_cjk_align_serif_edge( hints, edge->serif, edge ); edge->flags |= AF_EDGE_DONE; skipped--; } } if ( !skipped ) return; for ( edge = edges; edge < edge_limit; edge++ ) { AF_Edge before, after; if ( edge->flags & AF_EDGE_DONE ) continue; before = after = edge; while ( --before >= edges ) if ( before->flags & AF_EDGE_DONE ) break; while ( ++after < edge_limit ) if ( after->flags & AF_EDGE_DONE ) break; if ( before >= edges || after < edge_limit ) { if ( before < edges ) af_cjk_align_serif_edge( hints, after, edge ); else if ( after >= edge_limit ) af_cjk_align_serif_edge( hints, before, edge ); else { if ( after->fpos == before->fpos ) edge->pos = before->pos; else edge->pos = before->pos + FT_MulDiv( edge->fpos - before->fpos, after->pos - before->pos, after->fpos - before->fpos ); } } } } static void af_cjk_align_edge_points( 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; AF_Edge edge; FT_Bool snapping; snapping = FT_BOOL( ( dim == AF_DIMENSION_HORZ && AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) || ( dim == AF_DIMENSION_VERT && AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ); for ( edge = edges; edge < edge_limit; edge++ ) { /* move the points of each segment */ /* in each edge to the edge's position */ AF_Segment seg = edge->first; if ( snapping ) { do { AF_Point point = seg->first; for (;;) { if ( dim == AF_DIMENSION_HORZ ) { point->x = edge->pos; point->flags |= AF_FLAG_TOUCH_X; } else { point->y = edge->pos; point->flags |= AF_FLAG_TOUCH_Y; } if ( point == seg->last ) break; point = point->next; } seg = seg->edge_next; } while ( seg != edge->first ); } else { FT_Pos delta = edge->pos - edge->opos; do { AF_Point point = seg->first; for (;;) { if ( dim == AF_DIMENSION_HORZ ) { point->x += delta; point->flags |= AF_FLAG_TOUCH_X; } else { point->y += delta; point->flags |= AF_FLAG_TOUCH_Y; } if ( point == seg->last ) break; point = point->next; } seg = seg->edge_next; } while ( seg != edge->first ); } } } FT_LOCAL_DEF( FT_Error ) af_cjk_hints_apply( AF_GlyphHints hints, FT_Outline* outline, AF_LatinMetrics metrics ) { FT_Error error; int dim; FT_UNUSED( metrics ); error = af_glyph_hints_reload( hints, outline ); if ( error ) goto Exit; /* analyze glyph outline */ if ( AF_HINTS_DO_HORIZONTAL( hints ) ) { error = af_cjk_hints_detect_features( hints, AF_DIMENSION_HORZ ); if ( error ) goto Exit; } if ( AF_HINTS_DO_VERTICAL( hints ) ) { error = af_cjk_hints_detect_features( hints, AF_DIMENSION_VERT ); if ( error ) goto Exit; } /* grid-fit the outline */ 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 ) ) ) { #ifdef AF_USE_WARPER if ( dim == AF_DIMENSION_HORZ && metrics->root.scaler.render_mode == FT_RENDER_MODE_NORMAL ) { AF_WarperRec warper; FT_Fixed scale; FT_Pos delta; af_warper_compute( &warper, hints, dim, &scale, &delta ); af_glyph_hints_scale_dim( hints, dim, scale, delta ); continue; } #endif /* AF_USE_WARPER */ af_cjk_hint_edges( hints, (AF_Dimension)dim ); af_cjk_align_edge_points( hints, (AF_Dimension)dim ); af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim ); af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim ); } } #if 0 af_glyph_hints_dump_points( hints ); af_glyph_hints_dump_segments( hints ); af_glyph_hints_dump_edges( hints ); #endif af_glyph_hints_save( hints, outline ); Exit: return error; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** C J K S C R I P T C L A S S *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ static const AF_Script_UniRangeRec af_cjk_uniranges[] = { #if 0 AF_UNIRANGE_REC( 0x0100UL, 0xFFFFUL ), /* why this? */ #endif AF_UNIRANGE_REC( 0x2E80UL, 0x2EFFUL ), /* CJK Radicals Supplement */ AF_UNIRANGE_REC( 0x2F00UL, 0x2FDFUL ), /* Kangxi Radicals */ AF_UNIRANGE_REC( 0x3000UL, 0x303FUL ), /* CJK Symbols and Punctuation */ AF_UNIRANGE_REC( 0x3040UL, 0x309FUL ), /* Hiragana */ AF_UNIRANGE_REC( 0x30A0UL, 0x30FFUL ), /* Katakana */ AF_UNIRANGE_REC( 0x3100UL, 0x312FUL ), /* Bopomofo */ AF_UNIRANGE_REC( 0x3130UL, 0x318FUL ), /* Hangul Compatibility Jamo */ AF_UNIRANGE_REC( 0x31A0UL, 0x31BFUL ), /* Bopomofo Extended */ AF_UNIRANGE_REC( 0x31C0UL, 0x31EFUL ), /* CJK Strokes */ AF_UNIRANGE_REC( 0x31F0UL, 0x31FFUL ), /* Katakana Phonetic Extensions */ AF_UNIRANGE_REC( 0x3200UL, 0x32FFUL ), /* Enclosed CJK Letters and Months */ AF_UNIRANGE_REC( 0x3300UL, 0x33FFUL ), /* CJK Compatibility */ AF_UNIRANGE_REC( 0x3400UL, 0x4DBFUL ), /* CJK Unified Ideographs Extension A */ AF_UNIRANGE_REC( 0x4DC0UL, 0x4DFFUL ), /* Yijing Hexagram Symbols */ AF_UNIRANGE_REC( 0x4E00UL, 0x9FFFUL ), /* CJK Unified Ideographs */ AF_UNIRANGE_REC( 0xF900UL, 0xFAFFUL ), /* CJK Compatibility Ideographs */ AF_UNIRANGE_REC( 0xFE30UL, 0xFE4FUL ), /* CJK Compatibility Forms */ AF_UNIRANGE_REC( 0xFF00UL, 0xFFEFUL ), /* Halfwidth and Fullwidth Forms */ AF_UNIRANGE_REC( 0x20000UL, 0x2A6DFUL ), /* CJK Unified Ideographs Extension B */ AF_UNIRANGE_REC( 0x2F800UL, 0x2FA1FUL ), /* CJK Compatibility Ideographs Supplement */ AF_UNIRANGE_REC( 0UL, 0UL ) }; AF_DEFINE_SCRIPT_CLASS(af_cjk_script_class, AF_SCRIPT_CJK, af_cjk_uniranges, sizeof( AF_LatinMetricsRec ), (AF_Script_InitMetricsFunc) af_cjk_metrics_init, (AF_Script_ScaleMetricsFunc)af_cjk_metrics_scale, (AF_Script_DoneMetricsFunc) NULL, (AF_Script_InitHintsFunc) af_cjk_hints_init, (AF_Script_ApplyHintsFunc) af_cjk_hints_apply ) #else /* !AF_CONFIG_OPTION_CJK */ static const AF_Script_UniRangeRec af_cjk_uniranges[] = { AF_UNIRANGE_REC( 0UL, 0UL ) }; AF_DEFINE_SCRIPT_CLASS(af_cjk_script_class, AF_SCRIPT_CJK, af_cjk_uniranges, sizeof( AF_LatinMetricsRec ), (AF_Script_InitMetricsFunc) NULL, (AF_Script_ScaleMetricsFunc)NULL, (AF_Script_DoneMetricsFunc) NULL, (AF_Script_InitHintsFunc) NULL, (AF_Script_ApplyHintsFunc) NULL ) #endif /* !AF_CONFIG_OPTION_CJK */ /* END */