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/***************************************************************************/
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/* */
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/* afcjk.c */
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/* */
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/* Auto-fitter hinting routines for CJK script (body). */
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/* */
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/* Copyright 2006-2011 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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/*
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* The algorithm is based on akito's autohint patch, available here:
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*
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* http://www.kde.gr.jp/~akito/patch/freetype2/
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*
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*/
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#include "aftypes.h"
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#include "aflatin.h"
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#ifdef AF_CONFIG_OPTION_CJK
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#include "afcjk.h"
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#include "aferrors.h"
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#ifdef AF_CONFIG_OPTION_USE_WARPER
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#include "afwarp.h"
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#endif
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** C J K G L O B A L M E T R I C S *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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FT_LOCAL_DEF( FT_Error )
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af_cjk_metrics_init( AF_LatinMetrics metrics,
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FT_Face face )
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{
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FT_CharMap oldmap = face->charmap;
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metrics->units_per_em = face->units_per_EM;
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/* TODO are there blues? */
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if ( FT_Select_Charmap( face, FT_ENCODING_UNICODE ) )
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face->charmap = NULL;
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else
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{
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/* latin's version would suffice */
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af_latin_metrics_init_widths( metrics, face, 0x7530 );
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af_latin_metrics_check_digits( metrics, face );
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}
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FT_Set_Charmap( face, oldmap );
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return AF_Err_Ok;
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}
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static void
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af_cjk_metrics_scale_dim( AF_LatinMetrics metrics,
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AF_Scaler scaler,
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AF_Dimension dim )
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{
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AF_LatinAxis axis;
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axis = &metrics->axis[dim];
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if ( dim == AF_DIMENSION_HORZ )
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{
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axis->scale = scaler->x_scale;
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axis->delta = scaler->x_delta;
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}
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else
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{
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axis->scale = scaler->y_scale;
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axis->delta = scaler->y_delta;
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}
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}
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FT_LOCAL_DEF( void )
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af_cjk_metrics_scale( AF_LatinMetrics metrics,
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AF_Scaler scaler )
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{
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metrics->root.scaler = *scaler;
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af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );
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af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT );
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** C J K G L Y P H A N A L Y S I S *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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static FT_Error
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af_cjk_hints_compute_segments( AF_GlyphHints hints,
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AF_Dimension dim )
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{
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AF_AxisHints axis = &hints->axis[dim];
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AF_Segment segments = axis->segments;
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AF_Segment segment_limit = segments + axis->num_segments;
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FT_Error error;
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AF_Segment seg;
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error = af_latin_hints_compute_segments( hints, dim );
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if ( error )
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return error;
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/* a segment is round if it doesn't have successive */
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/* on-curve points. */
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for ( seg = segments; seg < segment_limit; seg++ )
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{
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AF_Point pt = seg->first;
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AF_Point last = seg->last;
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AF_Flags f0 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL);
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AF_Flags f1;
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seg->flags &= ~AF_EDGE_ROUND;
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for ( ; pt != last; f0 = f1 )
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{
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pt = pt->next;
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f1 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL);
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if ( !f0 && !f1 )
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break;
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if ( pt == last )
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seg->flags |= AF_EDGE_ROUND;
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}
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}
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return AF_Err_Ok;
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}
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static void
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af_cjk_hints_link_segments( AF_GlyphHints hints,
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AF_Dimension dim )
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{
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AF_AxisHints axis = &hints->axis[dim];
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AF_Segment segments = axis->segments;
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AF_Segment segment_limit = segments + axis->num_segments;
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AF_Direction major_dir = axis->major_dir;
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AF_Segment seg1, seg2;
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FT_Pos len_threshold;
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FT_Pos dist_threshold;
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len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 );
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dist_threshold = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
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: hints->y_scale;
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dist_threshold = FT_DivFix( 64 * 3, dist_threshold );
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/* now compare each segment to the others */
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for ( seg1 = segments; seg1 < segment_limit; seg1++ )
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{
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/* the fake segments are for metrics hinting only */
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if ( seg1->first == seg1->last )
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continue;
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if ( seg1->dir != major_dir )
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continue;
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for ( seg2 = segments; seg2 < segment_limit; seg2++ )
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if ( seg2 != seg1 && seg1->dir + seg2->dir == 0 )
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{
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FT_Pos dist = seg2->pos - seg1->pos;
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if ( dist < 0 )
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continue;
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{
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FT_Pos min = seg1->min_coord;
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FT_Pos max = seg1->max_coord;
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FT_Pos len;
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if ( min < seg2->min_coord )
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min = seg2->min_coord;
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if ( max > seg2->max_coord )
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max = seg2->max_coord;
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len = max - min;
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if ( len >= len_threshold )
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{
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if ( dist * 8 < seg1->score * 9 &&
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( dist * 8 < seg1->score * 7 || seg1->len < len ) )
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{
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seg1->score = dist;
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seg1->len = len;
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seg1->link = seg2;
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}
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if ( dist * 8 < seg2->score * 9 &&
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( dist * 8 < seg2->score * 7 || seg2->len < len ) )
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{
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seg2->score = dist;
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seg2->len = len;
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seg2->link = seg1;
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}
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}
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}
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}
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}
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/*
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* now compute the `serif' segments
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*
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* In Hanzi, some strokes are wider on one or both of the ends.
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* We either identify the stems on the ends as serifs or remove
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* the linkage, depending on the length of the stems.
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*
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*/
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{
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AF_Segment link1, link2;
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for ( seg1 = segments; seg1 < segment_limit; seg1++ )
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{
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link1 = seg1->link;
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if ( !link1 || link1->link != seg1 || link1->pos <= seg1->pos )
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continue;
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if ( seg1->score >= dist_threshold )
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continue;
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for ( seg2 = segments; seg2 < segment_limit; seg2++ )
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{
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if ( seg2->pos > seg1->pos || seg1 == seg2 )
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continue;
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link2 = seg2->link;
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if ( !link2 || link2->link != seg2 || link2->pos < link1->pos )
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continue;
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if ( seg1->pos == seg2->pos && link1->pos == link2->pos )
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continue;
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if ( seg2->score <= seg1->score || seg1->score * 4 <= seg2->score )
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continue;
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/* seg2 < seg1 < link1 < link2 */
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271 |
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if ( seg1->len >= seg2->len * 3 )
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{
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AF_Segment seg;
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for ( seg = segments; seg < segment_limit; seg++ )
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{
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AF_Segment link = seg->link;
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280 |
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281 |
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if ( link == seg2 )
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{
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seg->link = 0;
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seg->serif = link1;
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}
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else if ( link == link2 )
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288 |
{
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seg->link = 0;
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seg->serif = seg1;
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}
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}
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}
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else
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{
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seg1->link = link1->link = 0;
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297 |
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298 |
break;
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}
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}
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}
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}
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303 |
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for ( seg1 = segments; seg1 < segment_limit; seg1++ )
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{
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306 |
seg2 = seg1->link;
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307 |
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308 |
if ( seg2 )
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{
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310 |
seg2->num_linked++;
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311 |
if ( seg2->link != seg1 )
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312 |
{
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313 |
seg1->link = 0;
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314 |
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315 |
if ( seg2->score < dist_threshold || seg1->score < seg2->score * 4 )
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316 |
seg1->serif = seg2->link;
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317 |
else
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318 |
seg2->num_linked--;
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319 |
}
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320 |
}
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321 |
}
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322 |
}
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323 |
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324 |
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325 |
static FT_Error
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326 |
af_cjk_hints_compute_edges( AF_GlyphHints hints,
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327 |
AF_Dimension dim )
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328 |
{
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329 |
AF_AxisHints axis = &hints->axis[dim];
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330 |
FT_Error error = AF_Err_Ok;
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331 |
FT_Memory memory = hints->memory;
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332 |
AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim];
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333 |
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334 |
AF_Segment segments = axis->segments;
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335 |
AF_Segment segment_limit = segments + axis->num_segments;
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336 |
AF_Segment seg;
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337 |
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338 |
FT_Fixed scale;
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339 |
FT_Pos edge_distance_threshold;
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340 |
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341 |
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342 |
axis->num_edges = 0;
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343 |
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344 |
scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
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345 |
: hints->y_scale;
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346 |
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347 |
/*********************************************************************/
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348 |
/* */
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349 |
/* We begin by generating a sorted table of edges for the current */
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350 |
/* direction. To do so, we simply scan each segment and try to find */
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351 |
/* an edge in our table that corresponds to its position. */
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352 |
/* */
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353 |
/* If no edge is found, we create and insert a new edge in the */
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354 |
/* sorted table. Otherwise, we simply add the segment to the edge's */
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355 |
/* list which is then processed in the second step to compute the */
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356 |
/* edge's properties. */
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357 |
/* */
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358 |
/* Note that the edges table is sorted along the segment/edge */
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359 |
/* position. */
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360 |
/* */
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361 |
/*********************************************************************/
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362 |
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363 |
edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold,
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364 |
scale );
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365 |
if ( edge_distance_threshold > 64 / 4 )
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366 |
edge_distance_threshold = FT_DivFix( 64 / 4, scale );
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367 |
else
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368 |
edge_distance_threshold = laxis->edge_distance_threshold;
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369 |
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370 |
for ( seg = segments; seg < segment_limit; seg++ )
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371 |
{
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372 |
AF_Edge found = 0;
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373 |
FT_Pos best = 0xFFFFU;
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374 |
FT_Int ee;
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375 |
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376 |
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377 |
/* look for an edge corresponding to the segment */
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378 |
for ( ee = 0; ee < axis->num_edges; ee++ )
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379 |
{
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380 |
AF_Edge edge = axis->edges + ee;
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381 |
FT_Pos dist;
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382 |
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383 |
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|
384 |
if ( edge->dir != seg->dir )
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|
385 |
continue;
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386 |
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|
387 |
dist = seg->pos - edge->fpos;
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|
388 |
if ( dist < 0 )
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|
389 |
dist = -dist;
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390 |
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|
391 |
if ( dist < edge_distance_threshold && dist < best )
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|
392 |
{
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|
|
393 |
AF_Segment link = seg->link;
|
|
|
394 |
|
|
|
395 |
|
|
|
396 |
/* check whether all linked segments of the candidate edge */
|
|
|
397 |
/* can make a single edge. */
|
|
|
398 |
if ( link )
|
|
|
399 |
{
|
|
|
400 |
AF_Segment seg1 = edge->first;
|
|
|
401 |
AF_Segment link1;
|
|
|
402 |
FT_Pos dist2 = 0;
|
|
|
403 |
|
|
|
404 |
|
|
|
405 |
do
|
|
|
406 |
{
|
|
|
407 |
link1 = seg1->link;
|
|
|
408 |
if ( link1 )
|
|
|
409 |
{
|
|
|
410 |
dist2 = AF_SEGMENT_DIST( link, link1 );
|
|
|
411 |
if ( dist2 >= edge_distance_threshold )
|
|
|
412 |
break;
|
|
|
413 |
}
|
|
|
414 |
|
|
|
415 |
} while ( ( seg1 = seg1->edge_next ) != edge->first );
|
|
|
416 |
|
|
|
417 |
if ( dist2 >= edge_distance_threshold )
|
|
|
418 |
continue;
|
|
|
419 |
}
|
|
|
420 |
|
|
|
421 |
best = dist;
|
|
|
422 |
found = edge;
|
|
|
423 |
}
|
|
|
424 |
}
|
|
|
425 |
|
|
|
426 |
if ( !found )
|
|
|
427 |
{
|
|
|
428 |
AF_Edge edge;
|
|
|
429 |
|
|
|
430 |
|
|
|
431 |
/* insert a new edge in the list and */
|
|
|
432 |
/* sort according to the position */
|
|
|
433 |
error = af_axis_hints_new_edge( axis, seg->pos,
|
|
|
434 |
(AF_Direction)seg->dir,
|
|
|
435 |
memory, &edge );
|
|
|
436 |
if ( error )
|
|
|
437 |
goto Exit;
|
|
|
438 |
|
|
|
439 |
/* add the segment to the new edge's list */
|
|
|
440 |
FT_ZERO( edge );
|
|
|
441 |
|
|
|
442 |
edge->first = seg;
|
|
|
443 |
edge->last = seg;
|
|
|
444 |
edge->fpos = seg->pos;
|
|
|
445 |
edge->opos = edge->pos = FT_MulFix( seg->pos, scale );
|
|
|
446 |
seg->edge_next = seg;
|
|
|
447 |
edge->dir = seg->dir;
|
|
|
448 |
}
|
|
|
449 |
else
|
|
|
450 |
{
|
|
|
451 |
/* if an edge was found, simply add the segment to the edge's */
|
|
|
452 |
/* list */
|
|
|
453 |
seg->edge_next = found->first;
|
|
|
454 |
found->last->edge_next = seg;
|
|
|
455 |
found->last = seg;
|
|
|
456 |
}
|
|
|
457 |
}
|
|
|
458 |
|
|
|
459 |
/*********************************************************************/
|
|
|
460 |
/* */
|
|
|
461 |
/* Good, we now compute each edge's properties according to segments */
|
|
|
462 |
/* found on its position. Basically, these are as follows. */
|
|
|
463 |
/* */
|
|
|
464 |
/* - edge's main direction */
|
|
|
465 |
/* - stem edge, serif edge or both (which defaults to stem then) */
|
|
|
466 |
/* - rounded edge, straight or both (which defaults to straight) */
|
|
|
467 |
/* - link for edge */
|
|
|
468 |
/* */
|
|
|
469 |
/*********************************************************************/
|
|
|
470 |
|
|
|
471 |
/* first of all, set the `edge' field in each segment -- this is */
|
|
|
472 |
/* required in order to compute edge links */
|
|
|
473 |
/* */
|
|
|
474 |
/* Note that removing this loop and setting the `edge' field of each */
|
|
|
475 |
/* segment directly in the code above slows down execution speed for */
|
|
|
476 |
/* some reasons on platforms like the Sun. */
|
|
|
477 |
|
|
|
478 |
{
|
|
|
479 |
AF_Edge edges = axis->edges;
|
|
|
480 |
AF_Edge edge_limit = edges + axis->num_edges;
|
|
|
481 |
AF_Edge edge;
|
|
|
482 |
|
|
|
483 |
|
|
|
484 |
for ( edge = edges; edge < edge_limit; edge++ )
|
|
|
485 |
{
|
|
|
486 |
seg = edge->first;
|
|
|
487 |
if ( seg )
|
|
|
488 |
do
|
|
|
489 |
{
|
|
|
490 |
seg->edge = edge;
|
|
|
491 |
seg = seg->edge_next;
|
|
|
492 |
|
|
|
493 |
} while ( seg != edge->first );
|
|
|
494 |
}
|
|
|
495 |
|
|
|
496 |
/* now compute each edge properties */
|
|
|
497 |
for ( edge = edges; edge < edge_limit; edge++ )
|
|
|
498 |
{
|
|
|
499 |
FT_Int is_round = 0; /* does it contain round segments? */
|
|
|
500 |
FT_Int is_straight = 0; /* does it contain straight segments? */
|
|
|
501 |
|
|
|
502 |
|
|
|
503 |
seg = edge->first;
|
|
|
504 |
|
|
|
505 |
do
|
|
|
506 |
{
|
|
|
507 |
FT_Bool is_serif;
|
|
|
508 |
|
|
|
509 |
|
|
|
510 |
/* check for roundness of segment */
|
|
|
511 |
if ( seg->flags & AF_EDGE_ROUND )
|
|
|
512 |
is_round++;
|
|
|
513 |
else
|
|
|
514 |
is_straight++;
|
|
|
515 |
|
|
|
516 |
/* check for links -- if seg->serif is set, then seg->link must */
|
|
|
517 |
/* be ignored */
|
|
|
518 |
is_serif = (FT_Bool)( seg->serif && seg->serif->edge != edge );
|
|
|
519 |
|
|
|
520 |
if ( seg->link || is_serif )
|
|
|
521 |
{
|
|
|
522 |
AF_Edge edge2;
|
|
|
523 |
AF_Segment seg2;
|
|
|
524 |
|
|
|
525 |
|
|
|
526 |
edge2 = edge->link;
|
|
|
527 |
seg2 = seg->link;
|
|
|
528 |
|
|
|
529 |
if ( is_serif )
|
|
|
530 |
{
|
|
|
531 |
seg2 = seg->serif;
|
|
|
532 |
edge2 = edge->serif;
|
|
|
533 |
}
|
|
|
534 |
|
|
|
535 |
if ( edge2 )
|
|
|
536 |
{
|
|
|
537 |
FT_Pos edge_delta;
|
|
|
538 |
FT_Pos seg_delta;
|
|
|
539 |
|
|
|
540 |
|
|
|
541 |
edge_delta = edge->fpos - edge2->fpos;
|
|
|
542 |
if ( edge_delta < 0 )
|
|
|
543 |
edge_delta = -edge_delta;
|
|
|
544 |
|
|
|
545 |
seg_delta = AF_SEGMENT_DIST( seg, seg2 );
|
|
|
546 |
|
|
|
547 |
if ( seg_delta < edge_delta )
|
|
|
548 |
edge2 = seg2->edge;
|
|
|
549 |
}
|
|
|
550 |
else
|
|
|
551 |
edge2 = seg2->edge;
|
|
|
552 |
|
|
|
553 |
if ( is_serif )
|
|
|
554 |
{
|
|
|
555 |
edge->serif = edge2;
|
|
|
556 |
edge2->flags |= AF_EDGE_SERIF;
|
|
|
557 |
}
|
|
|
558 |
else
|
|
|
559 |
edge->link = edge2;
|
|
|
560 |
}
|
|
|
561 |
|
|
|
562 |
seg = seg->edge_next;
|
|
|
563 |
|
|
|
564 |
} while ( seg != edge->first );
|
|
|
565 |
|
|
|
566 |
/* set the round/straight flags */
|
|
|
567 |
edge->flags = AF_EDGE_NORMAL;
|
|
|
568 |
|
|
|
569 |
if ( is_round > 0 && is_round >= is_straight )
|
|
|
570 |
edge->flags |= AF_EDGE_ROUND;
|
|
|
571 |
|
|
|
572 |
/* get rid of serifs if link is set */
|
|
|
573 |
/* XXX: This gets rid of many unpleasant artefacts! */
|
|
|
574 |
/* Example: the `c' in cour.pfa at size 13 */
|
|
|
575 |
|
|
|
576 |
if ( edge->serif && edge->link )
|
|
|
577 |
edge->serif = 0;
|
|
|
578 |
}
|
|
|
579 |
}
|
|
|
580 |
|
|
|
581 |
Exit:
|
|
|
582 |
return error;
|
|
|
583 |
}
|
|
|
584 |
|
|
|
585 |
|
|
|
586 |
static FT_Error
|
|
|
587 |
af_cjk_hints_detect_features( AF_GlyphHints hints,
|
|
|
588 |
AF_Dimension dim )
|
|
|
589 |
{
|
|
|
590 |
FT_Error error;
|
|
|
591 |
|
|
|
592 |
|
|
|
593 |
error = af_cjk_hints_compute_segments( hints, dim );
|
|
|
594 |
if ( !error )
|
|
|
595 |
{
|
|
|
596 |
af_cjk_hints_link_segments( hints, dim );
|
|
|
597 |
|
|
|
598 |
error = af_cjk_hints_compute_edges( hints, dim );
|
|
|
599 |
}
|
|
|
600 |
return error;
|
|
|
601 |
}
|
|
|
602 |
|
|
|
603 |
|
|
|
604 |
FT_LOCAL_DEF( FT_Error )
|
|
|
605 |
af_cjk_hints_init( AF_GlyphHints hints,
|
|
|
606 |
AF_LatinMetrics metrics )
|
|
|
607 |
{
|
|
|
608 |
FT_Render_Mode mode;
|
|
|
609 |
FT_UInt32 scaler_flags, other_flags;
|
|
|
610 |
|
|
|
611 |
|
|
|
612 |
af_glyph_hints_rescale( hints, (AF_ScriptMetrics)metrics );
|
|
|
613 |
|
|
|
614 |
/*
|
|
|
615 |
* correct x_scale and y_scale when needed, since they may have
|
|
|
616 |
* been modified af_cjk_scale_dim above
|
|
|
617 |
*/
|
|
|
618 |
hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale;
|
|
|
619 |
hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta;
|
|
|
620 |
hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale;
|
|
|
621 |
hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta;
|
|
|
622 |
|
|
|
623 |
/* compute flags depending on render mode, etc. */
|
|
|
624 |
mode = metrics->root.scaler.render_mode;
|
|
|
625 |
|
|
|
626 |
#ifdef AF_CONFIG_OPTION_USE_WARPER
|
|
|
627 |
if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V )
|
|
|
628 |
metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL;
|
|
|
629 |
#endif
|
|
|
630 |
|
|
|
631 |
scaler_flags = hints->scaler_flags;
|
|
|
632 |
other_flags = 0;
|
|
|
633 |
|
|
|
634 |
/*
|
|
|
635 |
* We snap the width of vertical stems for the monochrome and
|
|
|
636 |
* horizontal LCD rendering targets only.
|
|
|
637 |
*/
|
|
|
638 |
if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD )
|
|
|
639 |
other_flags |= AF_LATIN_HINTS_HORZ_SNAP;
|
|
|
640 |
|
|
|
641 |
/*
|
|
|
642 |
* We snap the width of horizontal stems for the monochrome and
|
|
|
643 |
* vertical LCD rendering targets only.
|
|
|
644 |
*/
|
|
|
645 |
if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V )
|
|
|
646 |
other_flags |= AF_LATIN_HINTS_VERT_SNAP;
|
|
|
647 |
|
|
|
648 |
/*
|
|
|
649 |
* We adjust stems to full pixels only if we don't use the `light' mode.
|
|
|
650 |
*/
|
|
|
651 |
if ( mode != FT_RENDER_MODE_LIGHT )
|
|
|
652 |
other_flags |= AF_LATIN_HINTS_STEM_ADJUST;
|
|
|
653 |
|
|
|
654 |
if ( mode == FT_RENDER_MODE_MONO )
|
|
|
655 |
other_flags |= AF_LATIN_HINTS_MONO;
|
|
|
656 |
|
|
|
657 |
scaler_flags |= AF_SCALER_FLAG_NO_ADVANCE;
|
|
|
658 |
|
|
|
659 |
hints->scaler_flags = scaler_flags;
|
|
|
660 |
hints->other_flags = other_flags;
|
|
|
661 |
|
|
|
662 |
return 0;
|
|
|
663 |
}
|
|
|
664 |
|
|
|
665 |
|
|
|
666 |
/*************************************************************************/
|
|
|
667 |
/*************************************************************************/
|
|
|
668 |
/***** *****/
|
|
|
669 |
/***** C J K G L Y P H G R I D - F I T T I N G *****/
|
|
|
670 |
/***** *****/
|
|
|
671 |
/*************************************************************************/
|
|
|
672 |
/*************************************************************************/
|
|
|
673 |
|
|
|
674 |
/* snap a given width in scaled coordinates to one of the */
|
|
|
675 |
/* current standard widths */
|
|
|
676 |
|
|
|
677 |
static FT_Pos
|
|
|
678 |
af_cjk_snap_width( AF_Width widths,
|
|
|
679 |
FT_Int count,
|
|
|
680 |
FT_Pos width )
|
|
|
681 |
{
|
|
|
682 |
int n;
|
|
|
683 |
FT_Pos best = 64 + 32 + 2;
|
|
|
684 |
FT_Pos reference = width;
|
|
|
685 |
FT_Pos scaled;
|
|
|
686 |
|
|
|
687 |
|
|
|
688 |
for ( n = 0; n < count; n++ )
|
|
|
689 |
{
|
|
|
690 |
FT_Pos w;
|
|
|
691 |
FT_Pos dist;
|
|
|
692 |
|
|
|
693 |
|
|
|
694 |
w = widths[n].cur;
|
|
|
695 |
dist = width - w;
|
|
|
696 |
if ( dist < 0 )
|
|
|
697 |
dist = -dist;
|
|
|
698 |
if ( dist < best )
|
|
|
699 |
{
|
|
|
700 |
best = dist;
|
|
|
701 |
reference = w;
|
|
|
702 |
}
|
|
|
703 |
}
|
|
|
704 |
|
|
|
705 |
scaled = FT_PIX_ROUND( reference );
|
|
|
706 |
|
|
|
707 |
if ( width >= reference )
|
|
|
708 |
{
|
|
|
709 |
if ( width < scaled + 48 )
|
|
|
710 |
width = reference;
|
|
|
711 |
}
|
|
|
712 |
else
|
|
|
713 |
{
|
|
|
714 |
if ( width > scaled - 48 )
|
|
|
715 |
width = reference;
|
|
|
716 |
}
|
|
|
717 |
|
|
|
718 |
return width;
|
|
|
719 |
}
|
|
|
720 |
|
|
|
721 |
|
|
|
722 |
/* compute the snapped width of a given stem */
|
|
|
723 |
|
|
|
724 |
static FT_Pos
|
|
|
725 |
af_cjk_compute_stem_width( AF_GlyphHints hints,
|
|
|
726 |
AF_Dimension dim,
|
|
|
727 |
FT_Pos width,
|
|
|
728 |
AF_Edge_Flags base_flags,
|
|
|
729 |
AF_Edge_Flags stem_flags )
|
|
|
730 |
{
|
|
|
731 |
AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics;
|
|
|
732 |
AF_LatinAxis axis = & metrics->axis[dim];
|
|
|
733 |
FT_Pos dist = width;
|
|
|
734 |
FT_Int sign = 0;
|
|
|
735 |
FT_Int vertical = ( dim == AF_DIMENSION_VERT );
|
|
|
736 |
|
|
|
737 |
FT_UNUSED( base_flags );
|
|
|
738 |
FT_UNUSED( stem_flags );
|
|
|
739 |
|
|
|
740 |
|
|
|
741 |
if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
|
|
|
742 |
return width;
|
|
|
743 |
|
|
|
744 |
if ( dist < 0 )
|
|
|
745 |
{
|
|
|
746 |
dist = -width;
|
|
|
747 |
sign = 1;
|
|
|
748 |
}
|
|
|
749 |
|
|
|
750 |
if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ||
|
|
|
751 |
( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) )
|
|
|
752 |
{
|
|
|
753 |
/* smooth hinting process: very lightly quantize the stem width */
|
|
|
754 |
|
|
|
755 |
if ( axis->width_count > 0 )
|
|
|
756 |
{
|
|
|
757 |
if ( FT_ABS( dist - axis->widths[0].cur ) < 40 )
|
|
|
758 |
{
|
|
|
759 |
dist = axis->widths[0].cur;
|
|
|
760 |
if ( dist < 48 )
|
|
|
761 |
dist = 48;
|
|
|
762 |
|
|
|
763 |
goto Done_Width;
|
|
|
764 |
}
|
|
|
765 |
}
|
|
|
766 |
|
|
|
767 |
if ( dist < 54 )
|
|
|
768 |
dist += ( 54 - dist ) / 2 ;
|
|
|
769 |
else if ( dist < 3 * 64 )
|
|
|
770 |
{
|
|
|
771 |
FT_Pos delta;
|
|
|
772 |
|
|
|
773 |
|
|
|
774 |
delta = dist & 63;
|
|
|
775 |
dist &= -64;
|
|
|
776 |
|
|
|
777 |
if ( delta < 10 )
|
|
|
778 |
dist += delta;
|
|
|
779 |
else if ( delta < 22 )
|
|
|
780 |
dist += 10;
|
|
|
781 |
else if ( delta < 42 )
|
|
|
782 |
dist += delta;
|
|
|
783 |
else if ( delta < 54 )
|
|
|
784 |
dist += 54;
|
|
|
785 |
else
|
|
|
786 |
dist += delta;
|
|
|
787 |
}
|
|
|
788 |
}
|
|
|
789 |
else
|
|
|
790 |
{
|
|
|
791 |
/* strong hinting process: snap the stem width to integer pixels */
|
|
|
792 |
|
|
|
793 |
dist = af_cjk_snap_width( axis->widths, axis->width_count, dist );
|
|
|
794 |
|
|
|
795 |
if ( vertical )
|
|
|
796 |
{
|
|
|
797 |
/* in the case of vertical hinting, always round */
|
|
|
798 |
/* the stem heights to integer pixels */
|
|
|
799 |
|
|
|
800 |
if ( dist >= 64 )
|
|
|
801 |
dist = ( dist + 16 ) & ~63;
|
|
|
802 |
else
|
|
|
803 |
dist = 64;
|
|
|
804 |
}
|
|
|
805 |
else
|
|
|
806 |
{
|
|
|
807 |
if ( AF_LATIN_HINTS_DO_MONO( hints ) )
|
|
|
808 |
{
|
|
|
809 |
/* monochrome horizontal hinting: snap widths to integer pixels */
|
|
|
810 |
/* with a different threshold */
|
|
|
811 |
|
|
|
812 |
if ( dist < 64 )
|
|
|
813 |
dist = 64;
|
|
|
814 |
else
|
|
|
815 |
dist = ( dist + 32 ) & ~63;
|
|
|
816 |
}
|
|
|
817 |
else
|
|
|
818 |
{
|
|
|
819 |
/* for horizontal anti-aliased hinting, we adopt a more subtle */
|
|
|
820 |
/* approach: we strengthen small stems, round stems whose size */
|
|
|
821 |
/* is between 1 and 2 pixels to an integer, otherwise nothing */
|
|
|
822 |
|
|
|
823 |
if ( dist < 48 )
|
|
|
824 |
dist = ( dist + 64 ) >> 1;
|
|
|
825 |
|
|
|
826 |
else if ( dist < 128 )
|
|
|
827 |
dist = ( dist + 22 ) & ~63;
|
|
|
828 |
else
|
|
|
829 |
/* round otherwise to prevent color fringes in LCD mode */
|
|
|
830 |
dist = ( dist + 32 ) & ~63;
|
|
|
831 |
}
|
|
|
832 |
}
|
|
|
833 |
}
|
|
|
834 |
|
|
|
835 |
Done_Width:
|
|
|
836 |
if ( sign )
|
|
|
837 |
dist = -dist;
|
|
|
838 |
|
|
|
839 |
return dist;
|
|
|
840 |
}
|
|
|
841 |
|
|
|
842 |
|
|
|
843 |
/* align one stem edge relative to the previous stem edge */
|
|
|
844 |
|
|
|
845 |
static void
|
|
|
846 |
af_cjk_align_linked_edge( AF_GlyphHints hints,
|
|
|
847 |
AF_Dimension dim,
|
|
|
848 |
AF_Edge base_edge,
|
|
|
849 |
AF_Edge stem_edge )
|
|
|
850 |
{
|
|
|
851 |
FT_Pos dist = stem_edge->opos - base_edge->opos;
|
|
|
852 |
|
|
|
853 |
FT_Pos fitted_width = af_cjk_compute_stem_width(
|
|
|
854 |
hints, dim, dist,
|
|
|
855 |
(AF_Edge_Flags)base_edge->flags,
|
|
|
856 |
(AF_Edge_Flags)stem_edge->flags );
|
|
|
857 |
|
|
|
858 |
|
|
|
859 |
stem_edge->pos = base_edge->pos + fitted_width;
|
|
|
860 |
}
|
|
|
861 |
|
|
|
862 |
|
|
|
863 |
static void
|
|
|
864 |
af_cjk_align_serif_edge( AF_GlyphHints hints,
|
|
|
865 |
AF_Edge base,
|
|
|
866 |
AF_Edge serif )
|
|
|
867 |
{
|
|
|
868 |
FT_UNUSED( hints );
|
|
|
869 |
|
|
|
870 |
serif->pos = base->pos + ( serif->opos - base->opos );
|
|
|
871 |
}
|
|
|
872 |
|
|
|
873 |
|
|
|
874 |
/*************************************************************************/
|
|
|
875 |
/*************************************************************************/
|
|
|
876 |
/*************************************************************************/
|
|
|
877 |
/**** ****/
|
|
|
878 |
/**** E D G E H I N T I N G ****/
|
|
|
879 |
/**** ****/
|
|
|
880 |
/*************************************************************************/
|
|
|
881 |
/*************************************************************************/
|
|
|
882 |
/*************************************************************************/
|
|
|
883 |
|
|
|
884 |
|
|
|
885 |
#define AF_LIGHT_MODE_MAX_HORZ_GAP 9
|
|
|
886 |
#define AF_LIGHT_MODE_MAX_VERT_GAP 15
|
|
|
887 |
#define AF_LIGHT_MODE_MAX_DELTA_ABS 14
|
|
|
888 |
|
|
|
889 |
|
|
|
890 |
static FT_Pos
|
|
|
891 |
af_hint_normal_stem( AF_GlyphHints hints,
|
|
|
892 |
AF_Edge edge,
|
|
|
893 |
AF_Edge edge2,
|
|
|
894 |
FT_Pos anchor,
|
|
|
895 |
AF_Dimension dim )
|
|
|
896 |
{
|
|
|
897 |
FT_Pos org_len, cur_len, org_center;
|
|
|
898 |
FT_Pos cur_pos1, cur_pos2;
|
|
|
899 |
FT_Pos d_off1, u_off1, d_off2, u_off2, delta;
|
|
|
900 |
FT_Pos offset;
|
|
|
901 |
FT_Pos threshold = 64;
|
|
|
902 |
|
|
|
903 |
|
|
|
904 |
if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
|
|
|
905 |
{
|
|
|
906 |
if ( ( edge->flags & AF_EDGE_ROUND ) &&
|
|
|
907 |
( edge2->flags & AF_EDGE_ROUND ) )
|
|
|
908 |
{
|
|
|
909 |
if ( dim == AF_DIMENSION_VERT )
|
|
|
910 |
threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP;
|
|
|
911 |
else
|
|
|
912 |
threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP;
|
|
|
913 |
}
|
|
|
914 |
else
|
|
|
915 |
{
|
|
|
916 |
if ( dim == AF_DIMENSION_VERT )
|
|
|
917 |
threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP / 3;
|
|
|
918 |
else
|
|
|
919 |
threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP / 3;
|
|
|
920 |
}
|
|
|
921 |
}
|
|
|
922 |
|
|
|
923 |
org_len = edge2->opos - edge->opos;
|
|
|
924 |
cur_len = af_cjk_compute_stem_width( hints, dim, org_len,
|
|
|
925 |
(AF_Edge_Flags)edge->flags,
|
|
|
926 |
(AF_Edge_Flags)edge2->flags );
|
|
|
927 |
|
|
|
928 |
org_center = ( edge->opos + edge2->opos ) / 2 + anchor;
|
|
|
929 |
cur_pos1 = org_center - cur_len / 2;
|
|
|
930 |
cur_pos2 = cur_pos1 + cur_len;
|
|
|
931 |
d_off1 = cur_pos1 - FT_PIX_FLOOR( cur_pos1 );
|
|
|
932 |
d_off2 = cur_pos2 - FT_PIX_FLOOR( cur_pos2 );
|
|
|
933 |
u_off1 = 64 - d_off1;
|
|
|
934 |
u_off2 = 64 - d_off2;
|
|
|
935 |
delta = 0;
|
|
|
936 |
|
|
|
937 |
|
|
|
938 |
if ( d_off1 == 0 || d_off2 == 0 )
|
|
|
939 |
goto Exit;
|
|
|
940 |
|
|
|
941 |
if ( cur_len <= threshold )
|
|
|
942 |
{
|
|
|
943 |
if ( d_off2 < cur_len )
|
|
|
944 |
{
|
|
|
945 |
if ( u_off1 <= d_off2 )
|
|
|
946 |
delta = u_off1;
|
|
|
947 |
else
|
|
|
948 |
delta = -d_off2;
|
|
|
949 |
}
|
|
|
950 |
|
|
|
951 |
goto Exit;
|
|
|
952 |
}
|
|
|
953 |
|
|
|
954 |
if ( threshold < 64 )
|
|
|
955 |
{
|
|
|
956 |
if ( d_off1 >= threshold || u_off1 >= threshold ||
|
|
|
957 |
d_off2 >= threshold || u_off2 >= threshold )
|
|
|
958 |
goto Exit;
|
|
|
959 |
}
|
|
|
960 |
|
|
|
961 |
offset = cur_len % 64;
|
|
|
962 |
|
|
|
963 |
if ( offset < 32 )
|
|
|
964 |
{
|
|
|
965 |
if ( u_off1 <= offset || d_off2 <= offset )
|
|
|
966 |
goto Exit;
|
|
|
967 |
}
|
|
|
968 |
else
|
|
|
969 |
offset = 64 - threshold;
|
|
|
970 |
|
|
|
971 |
d_off1 = threshold - u_off1;
|
|
|
972 |
u_off1 = u_off1 - offset;
|
|
|
973 |
u_off2 = threshold - d_off2;
|
|
|
974 |
d_off2 = d_off2 - offset;
|
|
|
975 |
|
|
|
976 |
if ( d_off1 <= u_off1 )
|
|
|
977 |
u_off1 = -d_off1;
|
|
|
978 |
|
|
|
979 |
if ( d_off2 <= u_off2 )
|
|
|
980 |
u_off2 = -d_off2;
|
|
|
981 |
|
|
|
982 |
if ( FT_ABS( u_off1 ) <= FT_ABS( u_off2 ) )
|
|
|
983 |
delta = u_off1;
|
|
|
984 |
else
|
|
|
985 |
delta = u_off2;
|
|
|
986 |
|
|
|
987 |
Exit:
|
|
|
988 |
|
|
|
989 |
#if 1
|
|
|
990 |
if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
|
|
|
991 |
{
|
|
|
992 |
if ( delta > AF_LIGHT_MODE_MAX_DELTA_ABS )
|
|
|
993 |
delta = AF_LIGHT_MODE_MAX_DELTA_ABS;
|
|
|
994 |
else if ( delta < -AF_LIGHT_MODE_MAX_DELTA_ABS )
|
|
|
995 |
delta = -AF_LIGHT_MODE_MAX_DELTA_ABS;
|
|
|
996 |
}
|
|
|
997 |
#endif
|
|
|
998 |
|
|
|
999 |
cur_pos1 += delta;
|
|
|
1000 |
|
|
|
1001 |
if ( edge->opos < edge2->opos )
|
|
|
1002 |
{
|
|
|
1003 |
edge->pos = cur_pos1;
|
|
|
1004 |
edge2->pos = cur_pos1 + cur_len;
|
|
|
1005 |
}
|
|
|
1006 |
else
|
|
|
1007 |
{
|
|
|
1008 |
edge->pos = cur_pos1 + cur_len;
|
|
|
1009 |
edge2->pos = cur_pos1;
|
|
|
1010 |
}
|
|
|
1011 |
|
|
|
1012 |
return delta;
|
|
|
1013 |
}
|
|
|
1014 |
|
|
|
1015 |
|
|
|
1016 |
static void
|
|
|
1017 |
af_cjk_hint_edges( AF_GlyphHints hints,
|
|
|
1018 |
AF_Dimension dim )
|
|
|
1019 |
{
|
|
|
1020 |
AF_AxisHints axis = &hints->axis[dim];
|
|
|
1021 |
AF_Edge edges = axis->edges;
|
|
|
1022 |
AF_Edge edge_limit = edges + axis->num_edges;
|
|
|
1023 |
FT_PtrDist n_edges;
|
|
|
1024 |
AF_Edge edge;
|
|
|
1025 |
AF_Edge anchor = 0;
|
|
|
1026 |
FT_Pos delta = 0;
|
|
|
1027 |
FT_Int skipped = 0;
|
|
|
1028 |
FT_Bool has_last_stem = FALSE;
|
|
|
1029 |
FT_Pos last_stem_pos = 0;
|
|
|
1030 |
|
|
|
1031 |
|
|
|
1032 |
/* now we align all stem edges. */
|
|
|
1033 |
for ( edge = edges; edge < edge_limit; edge++ )
|
|
|
1034 |
{
|
|
|
1035 |
AF_Edge edge2;
|
|
|
1036 |
|
|
|
1037 |
|
|
|
1038 |
if ( edge->flags & AF_EDGE_DONE )
|
|
|
1039 |
continue;
|
|
|
1040 |
|
|
|
1041 |
/* skip all non-stem edges */
|
|
|
1042 |
edge2 = edge->link;
|
|
|
1043 |
if ( !edge2 )
|
|
|
1044 |
{
|
|
|
1045 |
skipped++;
|
|
|
1046 |
continue;
|
|
|
1047 |
}
|
|
|
1048 |
|
|
|
1049 |
/* Some CJK characters have so many stems that
|
|
|
1050 |
* the hinter is likely to merge two adjacent ones.
|
|
|
1051 |
* To solve this problem, if either edge of a stem
|
|
|
1052 |
* is too close to the previous one, we avoid
|
|
|
1053 |
* aligning the two edges, but rather interpolate
|
|
|
1054 |
* their locations at the end of this function in
|
|
|
1055 |
* order to preserve the space between the stems.
|
|
|
1056 |
*/
|
|
|
1057 |
if ( has_last_stem &&
|
|
|
1058 |
( edge->pos < last_stem_pos + 64 ||
|
|
|
1059 |
edge2->pos < last_stem_pos + 64 ) )
|
|
|
1060 |
{
|
|
|
1061 |
skipped++;
|
|
|
1062 |
continue;
|
|
|
1063 |
}
|
|
|
1064 |
|
|
|
1065 |
/* now align the stem */
|
|
|
1066 |
|
|
|
1067 |
if ( edge2 < edge )
|
|
|
1068 |
{
|
|
|
1069 |
af_cjk_align_linked_edge( hints, dim, edge2, edge );
|
|
|
1070 |
edge->flags |= AF_EDGE_DONE;
|
|
|
1071 |
/* We rarely reaches here it seems;
|
|
|
1072 |
* usually the two edges belonging
|
|
|
1073 |
* to one stem are marked as DONE together
|
|
|
1074 |
*/
|
|
|
1075 |
has_last_stem = TRUE;
|
|
|
1076 |
last_stem_pos = edge->pos;
|
|
|
1077 |
continue;
|
|
|
1078 |
}
|
|
|
1079 |
|
|
|
1080 |
if ( dim != AF_DIMENSION_VERT && !anchor )
|
|
|
1081 |
{
|
|
|
1082 |
|
|
|
1083 |
#if 0
|
|
|
1084 |
if ( fixedpitch )
|
|
|
1085 |
{
|
|
|
1086 |
AF_Edge left = edge;
|
|
|
1087 |
AF_Edge right = edge_limit - 1;
|
|
|
1088 |
AF_EdgeRec left1, left2, right1, right2;
|
|
|
1089 |
FT_Pos target, center1, center2;
|
|
|
1090 |
FT_Pos delta1, delta2, d1, d2;
|
|
|
1091 |
|
|
|
1092 |
|
|
|
1093 |
while ( right > left && !right->link )
|
|
|
1094 |
right--;
|
|
|
1095 |
|
|
|
1096 |
left1 = *left;
|
|
|
1097 |
left2 = *left->link;
|
|
|
1098 |
right1 = *right->link;
|
|
|
1099 |
right2 = *right;
|
|
|
1100 |
|
|
|
1101 |
delta = ( ( ( hinter->pp2.x + 32 ) & -64 ) - hinter->pp2.x ) / 2;
|
|
|
1102 |
target = left->opos + ( right->opos - left->opos ) / 2 + delta - 16;
|
|
|
1103 |
|
|
|
1104 |
delta1 = delta;
|
|
|
1105 |
delta1 += af_hint_normal_stem( hints, left, left->link,
|
|
|
1106 |
delta1, 0 );
|
|
|
1107 |
|
|
|
1108 |
if ( left->link != right )
|
|
|
1109 |
af_hint_normal_stem( hints, right->link, right, delta1, 0 );
|
|
|
1110 |
|
|
|
1111 |
center1 = left->pos + ( right->pos - left->pos ) / 2;
|
|
|
1112 |
|
|
|
1113 |
if ( center1 >= target )
|
|
|
1114 |
delta2 = delta - 32;
|
|
|
1115 |
else
|
|
|
1116 |
delta2 = delta + 32;
|
|
|
1117 |
|
|
|
1118 |
delta2 += af_hint_normal_stem( hints, &left1, &left2, delta2, 0 );
|
|
|
1119 |
|
|
|
1120 |
if ( delta1 != delta2 )
|
|
|
1121 |
{
|
|
|
1122 |
if ( left->link != right )
|
|
|
1123 |
af_hint_normal_stem( hints, &right1, &right2, delta2, 0 );
|
|
|
1124 |
|
|
|
1125 |
center2 = left1.pos + ( right2.pos - left1.pos ) / 2;
|
|
|
1126 |
|
|
|
1127 |
d1 = center1 - target;
|
|
|
1128 |
d2 = center2 - target;
|
|
|
1129 |
|
|
|
1130 |
if ( FT_ABS( d2 ) < FT_ABS( d1 ) )
|
|
|
1131 |
{
|
|
|
1132 |
left->pos = left1.pos;
|
|
|
1133 |
left->link->pos = left2.pos;
|
|
|
1134 |
|
|
|
1135 |
if ( left->link != right )
|
|
|
1136 |
{
|
|
|
1137 |
right->link->pos = right1.pos;
|
|
|
1138 |
right->pos = right2.pos;
|
|
|
1139 |
}
|
|
|
1140 |
|
|
|
1141 |
delta1 = delta2;
|
|
|
1142 |
}
|
|
|
1143 |
}
|
|
|
1144 |
|
|
|
1145 |
delta = delta1;
|
|
|
1146 |
right->link->flags |= AF_EDGE_DONE;
|
|
|
1147 |
right->flags |= AF_EDGE_DONE;
|
|
|
1148 |
}
|
|
|
1149 |
else
|
|
|
1150 |
|
|
|
1151 |
#endif /* 0 */
|
|
|
1152 |
|
|
|
1153 |
delta = af_hint_normal_stem( hints, edge, edge2, 0,
|
|
|
1154 |
AF_DIMENSION_HORZ );
|
|
|
1155 |
}
|
|
|
1156 |
else
|
|
|
1157 |
af_hint_normal_stem( hints, edge, edge2, delta, dim );
|
|
|
1158 |
|
|
|
1159 |
#if 0
|
|
|
1160 |
printf( "stem (%d,%d) adjusted (%.1f,%.1f)\n",
|
|
|
1161 |
edge - edges, edge2 - edges,
|
|
|
1162 |
( edge->pos - edge->opos ) / 64.0,
|
|
|
1163 |
( edge2->pos - edge2->opos ) / 64.0 );
|
|
|
1164 |
#endif
|
|
|
1165 |
|
|
|
1166 |
anchor = edge;
|
|
|
1167 |
edge->flags |= AF_EDGE_DONE;
|
|
|
1168 |
edge2->flags |= AF_EDGE_DONE;
|
|
|
1169 |
has_last_stem = TRUE;
|
|
|
1170 |
last_stem_pos = edge2->pos;
|
|
|
1171 |
}
|
|
|
1172 |
|
|
|
1173 |
/* make sure that lowercase m's maintain their symmetry */
|
|
|
1174 |
|
|
|
1175 |
/* In general, lowercase m's have six vertical edges if they are sans */
|
|
|
1176 |
/* serif, or twelve if they are with serifs. This implementation is */
|
|
|
1177 |
/* based on that assumption, and seems to work very well with most */
|
|
|
1178 |
/* faces. However, if for a certain face this assumption is not */
|
|
|
1179 |
/* true, the m is just rendered like before. In addition, any stem */
|
|
|
1180 |
/* correction will only be applied to symmetrical glyphs (even if the */
|
|
|
1181 |
/* glyph is not an m), so the potential for unwanted distortion is */
|
|
|
1182 |
/* relatively low. */
|
|
|
1183 |
|
|
|
1184 |
/* We don't handle horizontal edges since we can't easily assure that */
|
|
|
1185 |
/* the third (lowest) stem aligns with the base line; it might end up */
|
|
|
1186 |
/* one pixel higher or lower. */
|
|
|
1187 |
|
|
|
1188 |
n_edges = edge_limit - edges;
|
|
|
1189 |
if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )
|
|
|
1190 |
{
|
|
|
1191 |
AF_Edge edge1, edge2, edge3;
|
|
|
1192 |
FT_Pos dist1, dist2, span;
|
|
|
1193 |
|
|
|
1194 |
|
|
|
1195 |
if ( n_edges == 6 )
|
|
|
1196 |
{
|
|
|
1197 |
edge1 = edges;
|
|
|
1198 |
edge2 = edges + 2;
|
|
|
1199 |
edge3 = edges + 4;
|
|
|
1200 |
}
|
|
|
1201 |
else
|
|
|
1202 |
{
|
|
|
1203 |
edge1 = edges + 1;
|
|
|
1204 |
edge2 = edges + 5;
|
|
|
1205 |
edge3 = edges + 9;
|
|
|
1206 |
}
|
|
|
1207 |
|
|
|
1208 |
dist1 = edge2->opos - edge1->opos;
|
|
|
1209 |
dist2 = edge3->opos - edge2->opos;
|
|
|
1210 |
|
|
|
1211 |
span = dist1 - dist2;
|
|
|
1212 |
if ( span < 0 )
|
|
|
1213 |
span = -span;
|
|
|
1214 |
|
|
|
1215 |
if ( edge1->link == edge1 + 1 &&
|
|
|
1216 |
edge2->link == edge2 + 1 &&
|
|
|
1217 |
edge3->link == edge3 + 1 && span < 8 )
|
|
|
1218 |
{
|
|
|
1219 |
delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );
|
|
|
1220 |
edge3->pos -= delta;
|
|
|
1221 |
if ( edge3->link )
|
|
|
1222 |
edge3->link->pos -= delta;
|
|
|
1223 |
|
|
|
1224 |
/* move the serifs along with the stem */
|
|
|
1225 |
if ( n_edges == 12 )
|
|
|
1226 |
{
|
|
|
1227 |
( edges + 8 )->pos -= delta;
|
|
|
1228 |
( edges + 11 )->pos -= delta;
|
|
|
1229 |
}
|
|
|
1230 |
|
|
|
1231 |
edge3->flags |= AF_EDGE_DONE;
|
|
|
1232 |
if ( edge3->link )
|
|
|
1233 |
edge3->link->flags |= AF_EDGE_DONE;
|
|
|
1234 |
}
|
|
|
1235 |
}
|
|
|
1236 |
|
|
|
1237 |
if ( !skipped )
|
|
|
1238 |
return;
|
|
|
1239 |
|
|
|
1240 |
/*
|
|
|
1241 |
* now hint the remaining edges (serifs and single) in order
|
|
|
1242 |
* to complete our processing
|
|
|
1243 |
*/
|
|
|
1244 |
for ( edge = edges; edge < edge_limit; edge++ )
|
|
|
1245 |
{
|
|
|
1246 |
if ( edge->flags & AF_EDGE_DONE )
|
|
|
1247 |
continue;
|
|
|
1248 |
|
|
|
1249 |
if ( edge->serif )
|
|
|
1250 |
{
|
|
|
1251 |
af_cjk_align_serif_edge( hints, edge->serif, edge );
|
|
|
1252 |
edge->flags |= AF_EDGE_DONE;
|
|
|
1253 |
skipped--;
|
|
|
1254 |
}
|
|
|
1255 |
}
|
|
|
1256 |
|
|
|
1257 |
if ( !skipped )
|
|
|
1258 |
return;
|
|
|
1259 |
|
|
|
1260 |
for ( edge = edges; edge < edge_limit; edge++ )
|
|
|
1261 |
{
|
|
|
1262 |
AF_Edge before, after;
|
|
|
1263 |
|
|
|
1264 |
|
|
|
1265 |
if ( edge->flags & AF_EDGE_DONE )
|
|
|
1266 |
continue;
|
|
|
1267 |
|
|
|
1268 |
before = after = edge;
|
|
|
1269 |
|
|
|
1270 |
while ( --before >= edges )
|
|
|
1271 |
if ( before->flags & AF_EDGE_DONE )
|
|
|
1272 |
break;
|
|
|
1273 |
|
|
|
1274 |
while ( ++after < edge_limit )
|
|
|
1275 |
if ( after->flags & AF_EDGE_DONE )
|
|
|
1276 |
break;
|
|
|
1277 |
|
|
|
1278 |
if ( before >= edges || after < edge_limit )
|
|
|
1279 |
{
|
|
|
1280 |
if ( before < edges )
|
|
|
1281 |
af_cjk_align_serif_edge( hints, after, edge );
|
|
|
1282 |
else if ( after >= edge_limit )
|
|
|
1283 |
af_cjk_align_serif_edge( hints, before, edge );
|
|
|
1284 |
else
|
|
|
1285 |
{
|
|
|
1286 |
if ( after->fpos == before->fpos )
|
|
|
1287 |
edge->pos = before->pos;
|
|
|
1288 |
else
|
|
|
1289 |
edge->pos = before->pos +
|
|
|
1290 |
FT_MulDiv( edge->fpos - before->fpos,
|
|
|
1291 |
after->pos - before->pos,
|
|
|
1292 |
after->fpos - before->fpos );
|
|
|
1293 |
}
|
|
|
1294 |
}
|
|
|
1295 |
}
|
|
|
1296 |
}
|
|
|
1297 |
|
|
|
1298 |
|
|
|
1299 |
static void
|
|
|
1300 |
af_cjk_align_edge_points( AF_GlyphHints hints,
|
|
|
1301 |
AF_Dimension dim )
|
|
|
1302 |
{
|
|
|
1303 |
AF_AxisHints axis = & hints->axis[dim];
|
|
|
1304 |
AF_Edge edges = axis->edges;
|
|
|
1305 |
AF_Edge edge_limit = edges + axis->num_edges;
|
|
|
1306 |
AF_Edge edge;
|
|
|
1307 |
FT_Bool snapping;
|
|
|
1308 |
|
|
|
1309 |
|
|
|
1310 |
snapping = FT_BOOL( ( dim == AF_DIMENSION_HORZ &&
|
|
|
1311 |
AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ||
|
|
|
1312 |
( dim == AF_DIMENSION_VERT &&
|
|
|
1313 |
AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) );
|
|
|
1314 |
|
|
|
1315 |
for ( edge = edges; edge < edge_limit; edge++ )
|
|
|
1316 |
{
|
|
|
1317 |
/* move the points of each segment */
|
|
|
1318 |
/* in each edge to the edge's position */
|
|
|
1319 |
AF_Segment seg = edge->first;
|
|
|
1320 |
|
|
|
1321 |
|
|
|
1322 |
if ( snapping )
|
|
|
1323 |
{
|
|
|
1324 |
do
|
|
|
1325 |
{
|
|
|
1326 |
AF_Point point = seg->first;
|
|
|
1327 |
|
|
|
1328 |
|
|
|
1329 |
for (;;)
|
|
|
1330 |
{
|
|
|
1331 |
if ( dim == AF_DIMENSION_HORZ )
|
|
|
1332 |
{
|
|
|
1333 |
point->x = edge->pos;
|
|
|
1334 |
point->flags |= AF_FLAG_TOUCH_X;
|
|
|
1335 |
}
|
|
|
1336 |
else
|
|
|
1337 |
{
|
|
|
1338 |
point->y = edge->pos;
|
|
|
1339 |
point->flags |= AF_FLAG_TOUCH_Y;
|
|
|
1340 |
}
|
|
|
1341 |
|
|
|
1342 |
if ( point == seg->last )
|
|
|
1343 |
break;
|
|
|
1344 |
|
|
|
1345 |
point = point->next;
|
|
|
1346 |
}
|
|
|
1347 |
|
|
|
1348 |
seg = seg->edge_next;
|
|
|
1349 |
|
|
|
1350 |
} while ( seg != edge->first );
|
|
|
1351 |
}
|
|
|
1352 |
else
|
|
|
1353 |
{
|
|
|
1354 |
FT_Pos delta = edge->pos - edge->opos;
|
|
|
1355 |
|
|
|
1356 |
|
|
|
1357 |
do
|
|
|
1358 |
{
|
|
|
1359 |
AF_Point point = seg->first;
|
|
|
1360 |
|
|
|
1361 |
|
|
|
1362 |
for (;;)
|
|
|
1363 |
{
|
|
|
1364 |
if ( dim == AF_DIMENSION_HORZ )
|
|
|
1365 |
{
|
|
|
1366 |
point->x += delta;
|
|
|
1367 |
point->flags |= AF_FLAG_TOUCH_X;
|
|
|
1368 |
}
|
|
|
1369 |
else
|
|
|
1370 |
{
|
|
|
1371 |
point->y += delta;
|
|
|
1372 |
point->flags |= AF_FLAG_TOUCH_Y;
|
|
|
1373 |
}
|
|
|
1374 |
|
|
|
1375 |
if ( point == seg->last )
|
|
|
1376 |
break;
|
|
|
1377 |
|
|
|
1378 |
point = point->next;
|
|
|
1379 |
}
|
|
|
1380 |
|
|
|
1381 |
seg = seg->edge_next;
|
|
|
1382 |
|
|
|
1383 |
} while ( seg != edge->first );
|
|
|
1384 |
}
|
|
|
1385 |
}
|
|
|
1386 |
}
|
|
|
1387 |
|
|
|
1388 |
|
|
|
1389 |
FT_LOCAL_DEF( FT_Error )
|
|
|
1390 |
af_cjk_hints_apply( AF_GlyphHints hints,
|
|
|
1391 |
FT_Outline* outline,
|
|
|
1392 |
AF_LatinMetrics metrics )
|
|
|
1393 |
{
|
|
|
1394 |
FT_Error error;
|
|
|
1395 |
int dim;
|
|
|
1396 |
|
|
|
1397 |
FT_UNUSED( metrics );
|
|
|
1398 |
|
|
|
1399 |
|
|
|
1400 |
error = af_glyph_hints_reload( hints, outline );
|
|
|
1401 |
if ( error )
|
|
|
1402 |
goto Exit;
|
|
|
1403 |
|
|
|
1404 |
/* analyze glyph outline */
|
|
|
1405 |
if ( AF_HINTS_DO_HORIZONTAL( hints ) )
|
|
|
1406 |
{
|
|
|
1407 |
error = af_cjk_hints_detect_features( hints, AF_DIMENSION_HORZ );
|
|
|
1408 |
if ( error )
|
|
|
1409 |
goto Exit;
|
|
|
1410 |
}
|
|
|
1411 |
|
|
|
1412 |
if ( AF_HINTS_DO_VERTICAL( hints ) )
|
|
|
1413 |
{
|
|
|
1414 |
error = af_cjk_hints_detect_features( hints, AF_DIMENSION_VERT );
|
|
|
1415 |
if ( error )
|
|
|
1416 |
goto Exit;
|
|
|
1417 |
}
|
|
|
1418 |
|
|
|
1419 |
/* grid-fit the outline */
|
|
|
1420 |
for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
|
|
|
1421 |
{
|
|
|
1422 |
if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||
|
|
|
1423 |
( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) )
|
|
|
1424 |
{
|
|
|
1425 |
|
|
|
1426 |
#ifdef AF_CONFIG_OPTION_USE_WARPER
|
|
|
1427 |
if ( dim == AF_DIMENSION_HORZ &&
|
|
|
1428 |
metrics->root.scaler.render_mode == FT_RENDER_MODE_NORMAL )
|
|
|
1429 |
{
|
|
|
1430 |
AF_WarperRec warper;
|
|
|
1431 |
FT_Fixed scale;
|
|
|
1432 |
FT_Pos delta;
|
|
|
1433 |
|
|
|
1434 |
|
|
|
1435 |
af_warper_compute( &warper, hints, (AF_Dimension)dim,
|
|
|
1436 |
&scale, &delta );
|
|
|
1437 |
af_glyph_hints_scale_dim( hints, (AF_Dimension)dim,
|
|
|
1438 |
scale, delta );
|
|
|
1439 |
continue;
|
|
|
1440 |
}
|
|
|
1441 |
#endif /* AF_CONFIG_OPTION_USE_WARPER */
|
|
|
1442 |
|
|
|
1443 |
af_cjk_hint_edges( hints, (AF_Dimension)dim );
|
|
|
1444 |
af_cjk_align_edge_points( hints, (AF_Dimension)dim );
|
|
|
1445 |
af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim );
|
|
|
1446 |
af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim );
|
|
|
1447 |
}
|
|
|
1448 |
}
|
|
|
1449 |
|
|
|
1450 |
#if 0
|
|
|
1451 |
af_glyph_hints_dump_points( hints );
|
|
|
1452 |
af_glyph_hints_dump_segments( hints );
|
|
|
1453 |
af_glyph_hints_dump_edges( hints );
|
|
|
1454 |
#endif
|
|
|
1455 |
|
|
|
1456 |
af_glyph_hints_save( hints, outline );
|
|
|
1457 |
|
|
|
1458 |
Exit:
|
|
|
1459 |
return error;
|
|
|
1460 |
}
|
|
|
1461 |
|
|
|
1462 |
|
|
|
1463 |
/*************************************************************************/
|
|
|
1464 |
/*************************************************************************/
|
|
|
1465 |
/***** *****/
|
|
|
1466 |
/***** C J K S C R I P T C L A S S *****/
|
|
|
1467 |
/***** *****/
|
|
|
1468 |
/*************************************************************************/
|
|
|
1469 |
/*************************************************************************/
|
|
|
1470 |
|
|
|
1471 |
|
|
|
1472 |
/* this corresponds to Unicode 6.0 */
|
|
|
1473 |
|
|
|
1474 |
static const AF_Script_UniRangeRec af_cjk_uniranges[] =
|
|
|
1475 |
{
|
|
|
1476 |
AF_UNIRANGE_REC( 0x2E80UL, 0x2EFFUL ), /* CJK Radicals Supplement */
|
|
|
1477 |
AF_UNIRANGE_REC( 0x2F00UL, 0x2FDFUL ), /* Kangxi Radicals */
|
|
|
1478 |
AF_UNIRANGE_REC( 0x2FF0UL, 0x2FFFUL ), /* Ideographic Description Characters */
|
|
|
1479 |
AF_UNIRANGE_REC( 0x3000UL, 0x303FUL ), /* CJK Symbols and Punctuation */
|
|
|
1480 |
AF_UNIRANGE_REC( 0x3040UL, 0x309FUL ), /* Hiragana */
|
|
|
1481 |
AF_UNIRANGE_REC( 0x30A0UL, 0x30FFUL ), /* Katakana */
|
|
|
1482 |
AF_UNIRANGE_REC( 0x3100UL, 0x312FUL ), /* Bopomofo */
|
|
|
1483 |
AF_UNIRANGE_REC( 0x3130UL, 0x318FUL ), /* Hangul Compatibility Jamo */
|
|
|
1484 |
AF_UNIRANGE_REC( 0x3190UL, 0x319FUL ), /* Kanbun */
|
|
|
1485 |
AF_UNIRANGE_REC( 0x31A0UL, 0x31BFUL ), /* Bopomofo Extended */
|
|
|
1486 |
AF_UNIRANGE_REC( 0x31C0UL, 0x31EFUL ), /* CJK Strokes */
|
|
|
1487 |
AF_UNIRANGE_REC( 0x31F0UL, 0x31FFUL ), /* Katakana Phonetic Extensions */
|
|
|
1488 |
AF_UNIRANGE_REC( 0x3200UL, 0x32FFUL ), /* Enclosed CJK Letters and Months */
|
|
|
1489 |
AF_UNIRANGE_REC( 0x3300UL, 0x33FFUL ), /* CJK Compatibility */
|
|
|
1490 |
AF_UNIRANGE_REC( 0x3400UL, 0x4DBFUL ), /* CJK Unified Ideographs Extension A */
|
|
|
1491 |
AF_UNIRANGE_REC( 0x4DC0UL, 0x4DFFUL ), /* Yijing Hexagram Symbols */
|
|
|
1492 |
AF_UNIRANGE_REC( 0x4E00UL, 0x9FFFUL ), /* CJK Unified Ideographs */
|
|
|
1493 |
AF_UNIRANGE_REC( 0xA960UL, 0xA97FUL ), /* Hangul Jamo Extended-A */
|
|
|
1494 |
AF_UNIRANGE_REC( 0xAC00UL, 0xD7AFUL ), /* Hangul Syllables */
|
|
|
1495 |
AF_UNIRANGE_REC( 0xD7B0UL, 0xD7FFUL ), /* Hangul Jamo Extended-B */
|
|
|
1496 |
AF_UNIRANGE_REC( 0xF900UL, 0xFAFFUL ), /* CJK Compatibility Ideographs */
|
|
|
1497 |
AF_UNIRANGE_REC( 0xFE10UL, 0xFE1FUL ), /* Vertical forms */
|
|
|
1498 |
AF_UNIRANGE_REC( 0xFE30UL, 0xFE4FUL ), /* CJK Compatibility Forms */
|
|
|
1499 |
AF_UNIRANGE_REC( 0xFF00UL, 0xFFEFUL ), /* Halfwidth and Fullwidth Forms */
|
|
|
1500 |
AF_UNIRANGE_REC( 0x1B000UL, 0x1B0FFUL ), /* Kana Supplement */
|
|
|
1501 |
AF_UNIRANGE_REC( 0x1D300UL, 0x1D35FUL ), /* Tai Xuan Hing Symbols */
|
|
|
1502 |
AF_UNIRANGE_REC( 0x1F200UL, 0x1F2FFUL ), /* Enclosed Ideographic Supplement */
|
|
|
1503 |
AF_UNIRANGE_REC( 0x20000UL, 0x2A6DFUL ), /* CJK Unified Ideographs Extension B */
|
|
|
1504 |
AF_UNIRANGE_REC( 0x2A700UL, 0x2B73FUL ), /* CJK Unified Ideographs Extension C */
|
|
|
1505 |
AF_UNIRANGE_REC( 0x2B740UL, 0x2B81FUL ), /* CJK Unified Ideographs Extension D */
|
|
|
1506 |
AF_UNIRANGE_REC( 0x2F800UL, 0x2FA1FUL ), /* CJK Compatibility Ideographs Supplement */
|
|
|
1507 |
AF_UNIRANGE_REC( 0UL, 0UL )
|
|
|
1508 |
};
|
|
|
1509 |
|
|
|
1510 |
|
|
|
1511 |
AF_DEFINE_SCRIPT_CLASS(af_cjk_script_class,
|
|
|
1512 |
AF_SCRIPT_CJK,
|
|
|
1513 |
af_cjk_uniranges,
|
|
|
1514 |
|
|
|
1515 |
sizeof( AF_LatinMetricsRec ),
|
|
|
1516 |
|
|
|
1517 |
(AF_Script_InitMetricsFunc) af_cjk_metrics_init,
|
|
|
1518 |
(AF_Script_ScaleMetricsFunc)af_cjk_metrics_scale,
|
|
|
1519 |
(AF_Script_DoneMetricsFunc) NULL,
|
|
|
1520 |
|
|
|
1521 |
(AF_Script_InitHintsFunc) af_cjk_hints_init,
|
|
|
1522 |
(AF_Script_ApplyHintsFunc) af_cjk_hints_apply
|
|
|
1523 |
)
|
|
|
1524 |
|
|
|
1525 |
#else /* !AF_CONFIG_OPTION_CJK */
|
|
|
1526 |
|
|
|
1527 |
static const AF_Script_UniRangeRec af_cjk_uniranges[] =
|
|
|
1528 |
{
|
|
|
1529 |
AF_UNIRANGE_REC( 0UL, 0UL )
|
|
|
1530 |
};
|
|
|
1531 |
|
|
|
1532 |
|
|
|
1533 |
AF_DEFINE_SCRIPT_CLASS(af_cjk_script_class,
|
|
|
1534 |
AF_SCRIPT_CJK,
|
|
|
1535 |
af_cjk_uniranges,
|
|
|
1536 |
|
|
|
1537 |
sizeof( AF_LatinMetricsRec ),
|
|
|
1538 |
|
|
|
1539 |
(AF_Script_InitMetricsFunc) NULL,
|
|
|
1540 |
(AF_Script_ScaleMetricsFunc)NULL,
|
|
|
1541 |
(AF_Script_DoneMetricsFunc) NULL,
|
|
|
1542 |
|
|
|
1543 |
(AF_Script_InitHintsFunc) NULL,
|
|
|
1544 |
(AF_Script_ApplyHintsFunc) NULL
|
|
|
1545 |
)
|
|
|
1546 |
|
|
|
1547 |
#endif /* !AF_CONFIG_OPTION_CJK */
|
|
|
1548 |
|
|
|
1549 |
|
|
|
1550 |
/* END */
|