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Diffstat (limited to 'src/autofit/afcjk.c')
| -rw-r--r-- | src/autofit/afcjk.c | 1508 |
1 files changed, 0 insertions, 1508 deletions
diff --git a/src/autofit/afcjk.c b/src/autofit/afcjk.c deleted file mode 100644 index 7e9438b..0000000 --- a/src/autofit/afcjk.c +++ /dev/null @@ -1,1508 +0,0 @@ -/***************************************************************************/ -/* */ -/* afcjk.c */ -/* */ -/* Auto-fitter hinting routines for CJK script (body). */ -/* */ -/* Copyright 2006, 2007 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; - - /* latin's version would suffice */ - af_latin_metrics_init_widths( metrics, face, 0x7530 ); - - 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_Int 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 - 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, 0 ); - 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 - { 0x0100, 0xFFFF }, /* why this? */ -#endif - { 0x2E80, 0x2EFF }, /* CJK Radicals Supplement */ - { 0x2F00, 0x2FDF }, /* Kangxi Radicals */ - { 0x3000, 0x303F }, /* CJK Symbols and Punctuation */ - { 0x3040, 0x309F }, /* Hiragana */ - { 0x30A0, 0x30FF }, /* Katakana */ - { 0x3100, 0x312F }, /* Bopomofo */ - { 0x3130, 0x318F }, /* Hangul Compatibility Jamo */ - { 0x31A0, 0x31BF }, /* Bopomofo Extended */ - { 0x31C0, 0x31EF }, /* CJK Strokes */ - { 0x31F0, 0x31FF }, /* Katakana Phonetic Extensions */ - { 0x3200, 0x32FF }, /* Enclosed CJK Letters and Months */ - { 0x3300, 0x33FF }, /* CJK Compatibility */ - { 0x3400, 0x4DBF }, /* CJK Unified Ideographs Extension A */ - { 0x4DC0, 0x4DFF }, /* Yijing Hexagram Symbols */ - { 0x4E00, 0x9FFF }, /* CJK Unified Ideographs */ - { 0xF900, 0xFAFF }, /* CJK Compatibility Ideographs */ - { 0xFE30, 0xFE4F }, /* CJK Compatibility Forms */ - { 0xFF00, 0xFFEF }, /* Halfwidth and Fullwidth Forms */ - { 0x20000, 0x2A6DF }, /* CJK Unified Ideographs Extension B */ - { 0x2F800, 0x2FA1F }, /* CJK Compatibility Ideographs Supplement */ - { 0, 0 } - }; - - - FT_CALLBACK_TABLE_DEF const AF_ScriptClassRec - 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[] = - { - { 0, 0 } - }; - - - FT_CALLBACK_TABLE_DEF const AF_ScriptClassRec - 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 */ |