-/***************************************************************************/
-/* */
-/* 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 *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
-
- static 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;
- }
- }
-
-
- static 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, 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;
- }
-
-
- static 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 );
- }
- }
- }
-
-
- static 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 */
+/***************************************************************************/\r
+/* */\r
+/* afcjk.c */\r
+/* */\r
+/* Auto-fitter hinting routines for CJK script (body). */\r
+/* */\r
+/* Copyright 2006, 2007 by */\r
+/* David Turner, Robert Wilhelm, and Werner Lemberg. */\r
+/* */\r
+/* This file is part of the FreeType project, and may only be used, */\r
+/* modified, and distributed under the terms of the FreeType project */\r
+/* license, LICENSE.TXT. By continuing to use, modify, or distribute */\r
+/* this file you indicate that you have read the license and */\r
+/* understand and accept it fully. */\r
+/* */\r
+/***************************************************************************/\r
+\r
+ /*\r
+ * The algorithm is based on akito's autohint patch, available here:\r
+ *\r
+ * http://www.kde.gr.jp/~akito/patch/freetype2/\r
+ *\r
+ */\r
+\r
+#include "aftypes.h"\r
+#include "aflatin.h"\r
+\r
+\r
+#ifdef AF_CONFIG_OPTION_CJK\r
+\r
+#include "afcjk.h"\r
+#include "aferrors.h"\r
+\r
+\r
+#ifdef AF_USE_WARPER\r
+#include "afwarp.h"\r
+#endif\r
+\r
+\r
+ /*************************************************************************/\r
+ /*************************************************************************/\r
+ /***** *****/\r
+ /***** C J K G L O B A L M E T R I C S *****/\r
+ /***** *****/\r
+ /*************************************************************************/\r
+ /*************************************************************************/\r
+\r
+ static FT_Error\r
+ af_cjk_metrics_init( AF_LatinMetrics metrics,\r
+ FT_Face face )\r
+ {\r
+ FT_CharMap oldmap = face->charmap;\r
+\r
+\r
+ metrics->units_per_em = face->units_per_EM;\r
+\r
+ /* TODO are there blues? */\r
+\r
+ if ( FT_Select_Charmap( face, FT_ENCODING_UNICODE ) )\r
+ face->charmap = NULL;\r
+\r
+ /* latin's version would suffice */\r
+ af_latin_metrics_init_widths( metrics, face, 0x7530 );\r
+\r
+ FT_Set_Charmap( face, oldmap );\r
+\r
+ return AF_Err_Ok;\r
+ }\r
+\r
+\r
+ static void\r
+ af_cjk_metrics_scale_dim( AF_LatinMetrics metrics,\r
+ AF_Scaler scaler,\r
+ AF_Dimension dim )\r
+ {\r
+ AF_LatinAxis axis;\r
+\r
+\r
+ axis = &metrics->axis[dim];\r
+\r
+ if ( dim == AF_DIMENSION_HORZ )\r
+ {\r
+ axis->scale = scaler->x_scale;\r
+ axis->delta = scaler->x_delta;\r
+ }\r
+ else\r
+ {\r
+ axis->scale = scaler->y_scale;\r
+ axis->delta = scaler->y_delta;\r
+ }\r
+ }\r
+\r
+\r
+ static void\r
+ af_cjk_metrics_scale( AF_LatinMetrics metrics,\r
+ AF_Scaler scaler )\r
+ {\r
+ metrics->root.scaler = *scaler;\r
+\r
+ af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );\r
+ af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT );\r
+ }\r
+\r
+\r
+ /*************************************************************************/\r
+ /*************************************************************************/\r
+ /***** *****/\r
+ /***** C J K G L Y P H A N A L Y S I S *****/\r
+ /***** *****/\r
+ /*************************************************************************/\r
+ /*************************************************************************/\r
+\r
+ static FT_Error\r
+ af_cjk_hints_compute_segments( AF_GlyphHints hints,\r
+ AF_Dimension dim )\r
+ {\r
+ AF_AxisHints axis = &hints->axis[dim];\r
+ AF_Segment segments = axis->segments;\r
+ AF_Segment segment_limit = segments + axis->num_segments;\r
+ FT_Error error;\r
+ AF_Segment seg;\r
+\r
+\r
+ error = af_latin_hints_compute_segments( hints, dim );\r
+ if ( error )\r
+ return error;\r
+\r
+ /* a segment is round if it doesn't have successive */\r
+ /* on-curve points. */\r
+ for ( seg = segments; seg < segment_limit; seg++ )\r
+ {\r
+ AF_Point pt = seg->first;\r
+ AF_Point last = seg->last;\r
+ AF_Flags f0 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL);\r
+ AF_Flags f1;\r
+\r
+\r
+ seg->flags &= ~AF_EDGE_ROUND;\r
+\r
+ for ( ; pt != last; f0 = f1 )\r
+ {\r
+ pt = pt->next;\r
+ f1 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL);\r
+\r
+ if ( !f0 && !f1 )\r
+ break;\r
+\r
+ if ( pt == last )\r
+ seg->flags |= AF_EDGE_ROUND;\r
+ }\r
+ }\r
+\r
+ return AF_Err_Ok;\r
+ }\r
+\r
+\r
+ static void\r
+ af_cjk_hints_link_segments( AF_GlyphHints hints,\r
+ AF_Dimension dim )\r
+ {\r
+ AF_AxisHints axis = &hints->axis[dim];\r
+ AF_Segment segments = axis->segments;\r
+ AF_Segment segment_limit = segments + axis->num_segments;\r
+ AF_Direction major_dir = axis->major_dir;\r
+ AF_Segment seg1, seg2;\r
+ FT_Pos len_threshold;\r
+ FT_Pos dist_threshold;\r
+\r
+\r
+ len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 );\r
+\r
+ dist_threshold = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale\r
+ : hints->y_scale;\r
+ dist_threshold = FT_DivFix( 64 * 3, dist_threshold );\r
+\r
+ /* now compare each segment to the others */\r
+ for ( seg1 = segments; seg1 < segment_limit; seg1++ )\r
+ {\r
+ /* the fake segments are for metrics hinting only */\r
+ if ( seg1->first == seg1->last )\r
+ continue;\r
+\r
+ if ( seg1->dir != major_dir )\r
+ continue;\r
+\r
+ for ( seg2 = segments; seg2 < segment_limit; seg2++ )\r
+ if ( seg2 != seg1 && seg1->dir + seg2->dir == 0 )\r
+ {\r
+ FT_Pos dist = seg2->pos - seg1->pos;\r
+\r
+\r
+ if ( dist < 0 )\r
+ continue;\r
+\r
+ {\r
+ FT_Pos min = seg1->min_coord;\r
+ FT_Pos max = seg1->max_coord;\r
+ FT_Pos len;\r
+\r
+\r
+ if ( min < seg2->min_coord )\r
+ min = seg2->min_coord;\r
+\r
+ if ( max > seg2->max_coord )\r
+ max = seg2->max_coord;\r
+\r
+ len = max - min;\r
+ if ( len >= len_threshold )\r
+ {\r
+ if ( dist * 8 < seg1->score * 9 &&\r
+ ( dist * 8 < seg1->score * 7 || seg1->len < len ) )\r
+ {\r
+ seg1->score = dist;\r
+ seg1->len = len;\r
+ seg1->link = seg2;\r
+ }\r
+\r
+ if ( dist * 8 < seg2->score * 9 &&\r
+ ( dist * 8 < seg2->score * 7 || seg2->len < len ) )\r
+ {\r
+ seg2->score = dist;\r
+ seg2->len = len;\r
+ seg2->link = seg1;\r
+ }\r
+ }\r
+ }\r
+ }\r
+ }\r
+\r
+ /*\r
+ * now compute the `serif' segments\r
+ *\r
+ * In Hanzi, some strokes are wider on one or both of the ends.\r
+ * We either identify the stems on the ends as serifs or remove\r
+ * the linkage, depending on the length of the stems.\r
+ *\r
+ */\r
+\r
+ {\r
+ AF_Segment link1, link2;\r
+\r
+\r
+ for ( seg1 = segments; seg1 < segment_limit; seg1++ )\r
+ {\r
+ link1 = seg1->link;\r
+ if ( !link1 || link1->link != seg1 || link1->pos <= seg1->pos )\r
+ continue;\r
+\r
+ if ( seg1->score >= dist_threshold )\r
+ continue;\r
+\r
+ for ( seg2 = segments; seg2 < segment_limit; seg2++ )\r
+ {\r
+ if ( seg2->pos > seg1->pos || seg1 == seg2 )\r
+ continue;\r
+\r
+ link2 = seg2->link;\r
+ if ( !link2 || link2->link != seg2 || link2->pos < link1->pos )\r
+ continue;\r
+\r
+ if ( seg1->pos == seg2->pos && link1->pos == link2->pos )\r
+ continue;\r
+\r
+ if ( seg2->score <= seg1->score || seg1->score * 4 <= seg2->score )\r
+ continue;\r
+\r
+ /* seg2 < seg1 < link1 < link2 */\r
+\r
+ if ( seg1->len >= seg2->len * 3 )\r
+ {\r
+ AF_Segment seg;\r
+\r
+\r
+ for ( seg = segments; seg < segment_limit; seg++ )\r
+ {\r
+ AF_Segment link = seg->link;\r
+\r
+\r
+ if ( link == seg2 )\r
+ {\r
+ seg->link = 0;\r
+ seg->serif = link1;\r
+ }\r
+ else if ( link == link2 )\r
+ {\r
+ seg->link = 0;\r
+ seg->serif = seg1;\r
+ }\r
+ }\r
+ }\r
+ else\r
+ {\r
+ seg1->link = link1->link = 0;\r
+\r
+ break;\r
+ }\r
+ }\r
+ }\r
+ }\r
+\r
+ for ( seg1 = segments; seg1 < segment_limit; seg1++ )\r
+ {\r
+ seg2 = seg1->link;\r
+\r
+ if ( seg2 )\r
+ {\r
+ seg2->num_linked++;\r
+ if ( seg2->link != seg1 )\r
+ {\r
+ seg1->link = 0;\r
+\r
+ if ( seg2->score < dist_threshold || seg1->score < seg2->score * 4 )\r
+ seg1->serif = seg2->link;\r
+ else\r
+ seg2->num_linked--;\r
+ }\r
+ }\r
+ }\r
+ }\r
+\r
+\r
+ static FT_Error\r
+ af_cjk_hints_compute_edges( AF_GlyphHints hints,\r
+ AF_Dimension dim )\r
+ {\r
+ AF_AxisHints axis = &hints->axis[dim];\r
+ FT_Error error = AF_Err_Ok;\r
+ FT_Memory memory = hints->memory;\r
+ AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim];\r
+\r
+ AF_Segment segments = axis->segments;\r
+ AF_Segment segment_limit = segments + axis->num_segments;\r
+ AF_Segment seg;\r
+\r
+ FT_Fixed scale;\r
+ FT_Pos edge_distance_threshold;\r
+\r
+\r
+ axis->num_edges = 0;\r
+\r
+ scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale\r
+ : hints->y_scale;\r
+\r
+ /*********************************************************************/\r
+ /* */\r
+ /* We begin by generating a sorted table of edges for the current */\r
+ /* direction. To do so, we simply scan each segment and try to find */\r
+ /* an edge in our table that corresponds to its position. */\r
+ /* */\r
+ /* If no edge is found, we create and insert a new edge in the */\r
+ /* sorted table. Otherwise, we simply add the segment to the edge's */\r
+ /* list which is then processed in the second step to compute the */\r
+ /* edge's properties. */\r
+ /* */\r
+ /* Note that the edges table is sorted along the segment/edge */\r
+ /* position. */\r
+ /* */\r
+ /*********************************************************************/\r
+\r
+ edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold,\r
+ scale );\r
+ if ( edge_distance_threshold > 64 / 4 )\r
+ edge_distance_threshold = FT_DivFix( 64 / 4, scale );\r
+ else\r
+ edge_distance_threshold = laxis->edge_distance_threshold;\r
+\r
+ for ( seg = segments; seg < segment_limit; seg++ )\r
+ {\r
+ AF_Edge found = 0;\r
+ FT_Pos best = 0xFFFFU;\r
+ FT_Int ee;\r
+\r
+\r
+ /* look for an edge corresponding to the segment */\r
+ for ( ee = 0; ee < axis->num_edges; ee++ )\r
+ {\r
+ AF_Edge edge = axis->edges + ee;\r
+ FT_Pos dist;\r
+\r
+\r
+ if ( edge->dir != seg->dir )\r
+ continue;\r
+\r
+ dist = seg->pos - edge->fpos;\r
+ if ( dist < 0 )\r
+ dist = -dist;\r
+\r
+ if ( dist < edge_distance_threshold && dist < best )\r
+ {\r
+ AF_Segment link = seg->link;\r
+\r
+\r
+ /* check whether all linked segments of the candidate edge */\r
+ /* can make a single edge. */\r
+ if ( link )\r
+ {\r
+ AF_Segment seg1 = edge->first;\r
+ AF_Segment link1;\r
+ FT_Pos dist2 = 0;\r
+\r
+\r
+ do\r
+ {\r
+ link1 = seg1->link;\r
+ if ( link1 )\r
+ {\r
+ dist2 = AF_SEGMENT_DIST( link, link1 );\r
+ if ( dist2 >= edge_distance_threshold )\r
+ break;\r
+ }\r
+\r
+ } while ( ( seg1 = seg1->edge_next ) != edge->first );\r
+\r
+ if ( dist2 >= edge_distance_threshold )\r
+ continue;\r
+ }\r
+\r
+ best = dist;\r
+ found = edge;\r
+ }\r
+ }\r
+\r
+ if ( !found )\r
+ {\r
+ AF_Edge edge;\r
+\r
+\r
+ /* insert a new edge in the list and */\r
+ /* sort according to the position */\r
+ error = af_axis_hints_new_edge( axis, seg->pos, seg->dir, memory, &edge );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ /* add the segment to the new edge's list */\r
+ FT_ZERO( edge );\r
+\r
+ edge->first = seg;\r
+ edge->last = seg;\r
+ edge->fpos = seg->pos;\r
+ edge->opos = edge->pos = FT_MulFix( seg->pos, scale );\r
+ seg->edge_next = seg;\r
+ edge->dir = seg->dir;\r
+ }\r
+ else\r
+ {\r
+ /* if an edge was found, simply add the segment to the edge's */\r
+ /* list */\r
+ seg->edge_next = found->first;\r
+ found->last->edge_next = seg;\r
+ found->last = seg;\r
+ }\r
+ }\r
+\r
+ /*********************************************************************/\r
+ /* */\r
+ /* Good, we now compute each edge's properties according to segments */\r
+ /* found on its position. Basically, these are as follows. */\r
+ /* */\r
+ /* - edge's main direction */\r
+ /* - stem edge, serif edge or both (which defaults to stem then) */\r
+ /* - rounded edge, straight or both (which defaults to straight) */\r
+ /* - link for edge */\r
+ /* */\r
+ /*********************************************************************/\r
+\r
+ /* first of all, set the `edge' field in each segment -- this is */\r
+ /* required in order to compute edge links */\r
+ /* */\r
+ /* Note that removing this loop and setting the `edge' field of each */\r
+ /* segment directly in the code above slows down execution speed for */\r
+ /* some reasons on platforms like the Sun. */\r
+\r
+ {\r
+ AF_Edge edges = axis->edges;\r
+ AF_Edge edge_limit = edges + axis->num_edges;\r
+ AF_Edge edge;\r
+\r
+\r
+ for ( edge = edges; edge < edge_limit; edge++ )\r
+ {\r
+ seg = edge->first;\r
+ if ( seg )\r
+ do\r
+ {\r
+ seg->edge = edge;\r
+ seg = seg->edge_next;\r
+\r
+ } while ( seg != edge->first );\r
+ }\r
+\r
+ /* now compute each edge properties */\r
+ for ( edge = edges; edge < edge_limit; edge++ )\r
+ {\r
+ FT_Int is_round = 0; /* does it contain round segments? */\r
+ FT_Int is_straight = 0; /* does it contain straight segments? */\r
+\r
+\r
+ seg = edge->first;\r
+\r
+ do\r
+ {\r
+ FT_Bool is_serif;\r
+\r
+\r
+ /* check for roundness of segment */\r
+ if ( seg->flags & AF_EDGE_ROUND )\r
+ is_round++;\r
+ else\r
+ is_straight++;\r
+\r
+ /* check for links -- if seg->serif is set, then seg->link must */\r
+ /* be ignored */\r
+ is_serif = (FT_Bool)( seg->serif && seg->serif->edge != edge );\r
+\r
+ if ( seg->link || is_serif )\r
+ {\r
+ AF_Edge edge2;\r
+ AF_Segment seg2;\r
+\r
+\r
+ edge2 = edge->link;\r
+ seg2 = seg->link;\r
+\r
+ if ( is_serif )\r
+ {\r
+ seg2 = seg->serif;\r
+ edge2 = edge->serif;\r
+ }\r
+\r
+ if ( edge2 )\r
+ {\r
+ FT_Pos edge_delta;\r
+ FT_Pos seg_delta;\r
+\r
+\r
+ edge_delta = edge->fpos - edge2->fpos;\r
+ if ( edge_delta < 0 )\r
+ edge_delta = -edge_delta;\r
+\r
+ seg_delta = AF_SEGMENT_DIST( seg, seg2 );\r
+\r
+ if ( seg_delta < edge_delta )\r
+ edge2 = seg2->edge;\r
+ }\r
+ else\r
+ edge2 = seg2->edge;\r
+\r
+ if ( is_serif )\r
+ {\r
+ edge->serif = edge2;\r
+ edge2->flags |= AF_EDGE_SERIF;\r
+ }\r
+ else\r
+ edge->link = edge2;\r
+ }\r
+\r
+ seg = seg->edge_next;\r
+\r
+ } while ( seg != edge->first );\r
+\r
+ /* set the round/straight flags */\r
+ edge->flags = AF_EDGE_NORMAL;\r
+\r
+ if ( is_round > 0 && is_round >= is_straight )\r
+ edge->flags |= AF_EDGE_ROUND;\r
+\r
+ /* get rid of serifs if link is set */\r
+ /* XXX: This gets rid of many unpleasant artefacts! */\r
+ /* Example: the `c' in cour.pfa at size 13 */\r
+\r
+ if ( edge->serif && edge->link )\r
+ edge->serif = 0;\r
+ }\r
+ }\r
+\r
+ Exit:\r
+ return error;\r
+ }\r
+\r
+\r
+ static FT_Error\r
+ af_cjk_hints_detect_features( AF_GlyphHints hints,\r
+ AF_Dimension dim )\r
+ {\r
+ FT_Error error;\r
+\r
+\r
+ error = af_cjk_hints_compute_segments( hints, dim );\r
+ if ( !error )\r
+ {\r
+ af_cjk_hints_link_segments( hints, dim );\r
+\r
+ error = af_cjk_hints_compute_edges( hints, dim );\r
+ }\r
+ return error;\r
+ }\r
+\r
+\r
+ static FT_Error\r
+ af_cjk_hints_init( AF_GlyphHints hints,\r
+ AF_LatinMetrics metrics )\r
+ {\r
+ FT_Render_Mode mode;\r
+ FT_UInt32 scaler_flags, other_flags;\r
+\r
+\r
+ af_glyph_hints_rescale( hints, (AF_ScriptMetrics)metrics );\r
+\r
+ /*\r
+ * correct x_scale and y_scale when needed, since they may have\r
+ * been modified af_cjk_scale_dim above\r
+ */\r
+ hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale;\r
+ hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta;\r
+ hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale;\r
+ hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta;\r
+\r
+ /* compute flags depending on render mode, etc. */\r
+ mode = metrics->root.scaler.render_mode;\r
+\r
+#ifdef AF_USE_WARPER\r
+ if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V )\r
+ metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL;\r
+#endif\r
+\r
+ scaler_flags = hints->scaler_flags;\r
+ other_flags = 0;\r
+\r
+ /*\r
+ * We snap the width of vertical stems for the monochrome and\r
+ * horizontal LCD rendering targets only.\r
+ */\r
+ if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD )\r
+ other_flags |= AF_LATIN_HINTS_HORZ_SNAP;\r
+\r
+ /*\r
+ * We snap the width of horizontal stems for the monochrome and\r
+ * vertical LCD rendering targets only.\r
+ */\r
+ if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V )\r
+ other_flags |= AF_LATIN_HINTS_VERT_SNAP;\r
+\r
+ /*\r
+ * We adjust stems to full pixels only if we don't use the `light' mode.\r
+ */\r
+ if ( mode != FT_RENDER_MODE_LIGHT )\r
+ other_flags |= AF_LATIN_HINTS_STEM_ADJUST;\r
+\r
+ if ( mode == FT_RENDER_MODE_MONO )\r
+ other_flags |= AF_LATIN_HINTS_MONO;\r
+\r
+ scaler_flags |= AF_SCALER_FLAG_NO_ADVANCE;\r
+\r
+ hints->scaler_flags = scaler_flags;\r
+ hints->other_flags = other_flags;\r
+\r
+ return 0;\r
+ }\r
+\r
+\r
+ /*************************************************************************/\r
+ /*************************************************************************/\r
+ /***** *****/\r
+ /***** C J K G L Y P H G R I D - F I T T I N G *****/\r
+ /***** *****/\r
+ /*************************************************************************/\r
+ /*************************************************************************/\r
+\r
+ /* snap a given width in scaled coordinates to one of the */\r
+ /* current standard widths */\r
+\r
+ static FT_Pos\r
+ af_cjk_snap_width( AF_Width widths,\r
+ FT_Int count,\r
+ FT_Pos width )\r
+ {\r
+ int n;\r
+ FT_Pos best = 64 + 32 + 2;\r
+ FT_Pos reference = width;\r
+ FT_Pos scaled;\r
+\r
+\r
+ for ( n = 0; n < count; n++ )\r
+ {\r
+ FT_Pos w;\r
+ FT_Pos dist;\r
+\r
+\r
+ w = widths[n].cur;\r
+ dist = width - w;\r
+ if ( dist < 0 )\r
+ dist = -dist;\r
+ if ( dist < best )\r
+ {\r
+ best = dist;\r
+ reference = w;\r
+ }\r
+ }\r
+\r
+ scaled = FT_PIX_ROUND( reference );\r
+\r
+ if ( width >= reference )\r
+ {\r
+ if ( width < scaled + 48 )\r
+ width = reference;\r
+ }\r
+ else\r
+ {\r
+ if ( width > scaled - 48 )\r
+ width = reference;\r
+ }\r
+\r
+ return width;\r
+ }\r
+\r
+\r
+ /* compute the snapped width of a given stem */\r
+\r
+ static FT_Pos\r
+ af_cjk_compute_stem_width( AF_GlyphHints hints,\r
+ AF_Dimension dim,\r
+ FT_Pos width,\r
+ AF_Edge_Flags base_flags,\r
+ AF_Edge_Flags stem_flags )\r
+ {\r
+ AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics;\r
+ AF_LatinAxis axis = & metrics->axis[dim];\r
+ FT_Pos dist = width;\r
+ FT_Int sign = 0;\r
+ FT_Int vertical = ( dim == AF_DIMENSION_VERT );\r
+\r
+ FT_UNUSED( base_flags );\r
+ FT_UNUSED( stem_flags );\r
+\r
+\r
+ if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )\r
+ return width;\r
+\r
+ if ( dist < 0 )\r
+ {\r
+ dist = -width;\r
+ sign = 1;\r
+ }\r
+\r
+ if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ||\r
+ ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) )\r
+ {\r
+ /* smooth hinting process: very lightly quantize the stem width */\r
+\r
+ if ( axis->width_count > 0 )\r
+ {\r
+ if ( FT_ABS( dist - axis->widths[0].cur ) < 40 )\r
+ {\r
+ dist = axis->widths[0].cur;\r
+ if ( dist < 48 )\r
+ dist = 48;\r
+\r
+ goto Done_Width;\r
+ }\r
+ }\r
+\r
+ if ( dist < 54 )\r
+ dist += ( 54 - dist ) / 2 ;\r
+ else if ( dist < 3 * 64 )\r
+ {\r
+ FT_Pos delta;\r
+\r
+\r
+ delta = dist & 63;\r
+ dist &= -64;\r
+\r
+ if ( delta < 10 )\r
+ dist += delta;\r
+ else if ( delta < 22 )\r
+ dist += 10;\r
+ else if ( delta < 42 )\r
+ dist += delta;\r
+ else if ( delta < 54 )\r
+ dist += 54;\r
+ else\r
+ dist += delta;\r
+ }\r
+ }\r
+ else\r
+ {\r
+ /* strong hinting process: snap the stem width to integer pixels */\r
+\r
+ dist = af_cjk_snap_width( axis->widths, axis->width_count, dist );\r
+\r
+ if ( vertical )\r
+ {\r
+ /* in the case of vertical hinting, always round */\r
+ /* the stem heights to integer pixels */\r
+\r
+ if ( dist >= 64 )\r
+ dist = ( dist + 16 ) & ~63;\r
+ else\r
+ dist = 64;\r
+ }\r
+ else\r
+ {\r
+ if ( AF_LATIN_HINTS_DO_MONO( hints ) )\r
+ {\r
+ /* monochrome horizontal hinting: snap widths to integer pixels */\r
+ /* with a different threshold */\r
+\r
+ if ( dist < 64 )\r
+ dist = 64;\r
+ else\r
+ dist = ( dist + 32 ) & ~63;\r
+ }\r
+ else\r
+ {\r
+ /* for horizontal anti-aliased hinting, we adopt a more subtle */\r
+ /* approach: we strengthen small stems, round stems whose size */\r
+ /* is between 1 and 2 pixels to an integer, otherwise nothing */\r
+\r
+ if ( dist < 48 )\r
+ dist = ( dist + 64 ) >> 1;\r
+\r
+ else if ( dist < 128 )\r
+ dist = ( dist + 22 ) & ~63;\r
+ else\r
+ /* round otherwise to prevent color fringes in LCD mode */\r
+ dist = ( dist + 32 ) & ~63;\r
+ }\r
+ }\r
+ }\r
+\r
+ Done_Width:\r
+ if ( sign )\r
+ dist = -dist;\r
+\r
+ return dist;\r
+ }\r
+\r
+\r
+ /* align one stem edge relative to the previous stem edge */\r
+\r
+ static void\r
+ af_cjk_align_linked_edge( AF_GlyphHints hints,\r
+ AF_Dimension dim,\r
+ AF_Edge base_edge,\r
+ AF_Edge stem_edge )\r
+ {\r
+ FT_Pos dist = stem_edge->opos - base_edge->opos;\r
+\r
+ FT_Pos fitted_width = af_cjk_compute_stem_width(\r
+ hints, dim, dist,\r
+ (AF_Edge_Flags)base_edge->flags,\r
+ (AF_Edge_Flags)stem_edge->flags );\r
+\r
+\r
+ stem_edge->pos = base_edge->pos + fitted_width;\r
+ }\r
+\r
+\r
+ static void\r
+ af_cjk_align_serif_edge( AF_GlyphHints hints,\r
+ AF_Edge base,\r
+ AF_Edge serif )\r
+ {\r
+ FT_UNUSED( hints );\r
+\r
+ serif->pos = base->pos + ( serif->opos - base->opos );\r
+ }\r
+\r
+\r
+ /*************************************************************************/\r
+ /*************************************************************************/\r
+ /*************************************************************************/\r
+ /**** ****/\r
+ /**** E D G E H I N T I N G ****/\r
+ /**** ****/\r
+ /*************************************************************************/\r
+ /*************************************************************************/\r
+ /*************************************************************************/\r
+\r
+\r
+#define AF_LIGHT_MODE_MAX_HORZ_GAP 9\r
+#define AF_LIGHT_MODE_MAX_VERT_GAP 15\r
+#define AF_LIGHT_MODE_MAX_DELTA_ABS 14\r
+\r
+\r
+ static FT_Pos\r
+ af_hint_normal_stem( AF_GlyphHints hints,\r
+ AF_Edge edge,\r
+ AF_Edge edge2,\r
+ FT_Pos anchor,\r
+ AF_Dimension dim )\r
+ {\r
+ FT_Pos org_len, cur_len, org_center;\r
+ FT_Pos cur_pos1, cur_pos2;\r
+ FT_Pos d_off1, u_off1, d_off2, u_off2, delta;\r
+ FT_Pos offset;\r
+ FT_Pos threshold = 64;\r
+\r
+\r
+ if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )\r
+ {\r
+ if ( ( edge->flags & AF_EDGE_ROUND ) &&\r
+ ( edge2->flags & AF_EDGE_ROUND ) )\r
+ {\r
+ if ( dim == AF_DIMENSION_VERT )\r
+ threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP;\r
+ else\r
+ threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP;\r
+ }\r
+ else\r
+ {\r
+ if ( dim == AF_DIMENSION_VERT )\r
+ threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP / 3;\r
+ else\r
+ threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP / 3;\r
+ }\r
+ }\r
+\r
+ org_len = edge2->opos - edge->opos;\r
+ cur_len = af_cjk_compute_stem_width( hints, dim, org_len,\r
+ (AF_Edge_Flags)edge->flags,\r
+ (AF_Edge_Flags)edge2->flags );\r
+\r
+ org_center = ( edge->opos + edge2->opos ) / 2 + anchor;\r
+ cur_pos1 = org_center - cur_len / 2;\r
+ cur_pos2 = cur_pos1 + cur_len;\r
+ d_off1 = cur_pos1 - FT_PIX_FLOOR( cur_pos1 );\r
+ d_off2 = cur_pos2 - FT_PIX_FLOOR( cur_pos2 );\r
+ u_off1 = 64 - d_off1;\r
+ u_off2 = 64 - d_off2;\r
+ delta = 0;\r
+\r
+\r
+ if ( d_off1 == 0 || d_off2 == 0 )\r
+ goto Exit;\r
+\r
+ if ( cur_len <= threshold )\r
+ {\r
+ if ( d_off2 < cur_len )\r
+ {\r
+ if ( u_off1 <= d_off2 )\r
+ delta = u_off1;\r
+ else\r
+ delta = -d_off2;\r
+ }\r
+\r
+ goto Exit;\r
+ }\r
+\r
+ if ( threshold < 64 )\r
+ {\r
+ if ( d_off1 >= threshold || u_off1 >= threshold ||\r
+ d_off2 >= threshold || u_off2 >= threshold )\r
+ goto Exit;\r
+ }\r
+\r
+ offset = cur_len % 64;\r
+\r
+ if ( offset < 32 )\r
+ {\r
+ if ( u_off1 <= offset || d_off2 <= offset )\r
+ goto Exit;\r
+ }\r
+ else\r
+ offset = 64 - threshold;\r
+\r
+ d_off1 = threshold - u_off1;\r
+ u_off1 = u_off1 - offset;\r
+ u_off2 = threshold - d_off2;\r
+ d_off2 = d_off2 - offset;\r
+\r
+ if ( d_off1 <= u_off1 )\r
+ u_off1 = -d_off1;\r
+\r
+ if ( d_off2 <= u_off2 )\r
+ u_off2 = -d_off2;\r
+\r
+ if ( FT_ABS( u_off1 ) <= FT_ABS( u_off2 ) )\r
+ delta = u_off1;\r
+ else\r
+ delta = u_off2;\r
+\r
+ Exit:\r
+\r
+#if 1\r
+ if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )\r
+ {\r
+ if ( delta > AF_LIGHT_MODE_MAX_DELTA_ABS )\r
+ delta = AF_LIGHT_MODE_MAX_DELTA_ABS;\r
+ else if ( delta < -AF_LIGHT_MODE_MAX_DELTA_ABS )\r
+ delta = -AF_LIGHT_MODE_MAX_DELTA_ABS;\r
+ }\r
+#endif\r
+\r
+ cur_pos1 += delta;\r
+\r
+ if ( edge->opos < edge2->opos )\r
+ {\r
+ edge->pos = cur_pos1;\r
+ edge2->pos = cur_pos1 + cur_len;\r
+ }\r
+ else\r
+ {\r
+ edge->pos = cur_pos1 + cur_len;\r
+ edge2->pos = cur_pos1;\r
+ }\r
+\r
+ return delta;\r
+ }\r
+\r
+\r
+ static void\r
+ af_cjk_hint_edges( AF_GlyphHints hints,\r
+ AF_Dimension dim )\r
+ {\r
+ AF_AxisHints axis = &hints->axis[dim];\r
+ AF_Edge edges = axis->edges;\r
+ AF_Edge edge_limit = edges + axis->num_edges;\r
+ FT_Int n_edges;\r
+ AF_Edge edge;\r
+ AF_Edge anchor = 0;\r
+ FT_Pos delta = 0;\r
+ FT_Int skipped = 0;\r
+\r
+\r
+ /* now we align all stem edges. */\r
+ for ( edge = edges; edge < edge_limit; edge++ )\r
+ {\r
+ AF_Edge edge2;\r
+\r
+\r
+ if ( edge->flags & AF_EDGE_DONE )\r
+ continue;\r
+\r
+ /* skip all non-stem edges */\r
+ edge2 = edge->link;\r
+ if ( !edge2 )\r
+ {\r
+ skipped++;\r
+ continue;\r
+ }\r
+\r
+ /* now align the stem */\r
+\r
+ if ( edge2 < edge )\r
+ {\r
+ af_cjk_align_linked_edge( hints, dim, edge2, edge );\r
+ edge->flags |= AF_EDGE_DONE;\r
+ continue;\r
+ }\r
+\r
+ if ( dim != AF_DIMENSION_VERT && !anchor )\r
+ {\r
+\r
+#if 0\r
+ if ( fixedpitch )\r
+ {\r
+ AF_Edge left = edge;\r
+ AF_Edge right = edge_limit - 1;\r
+ AF_EdgeRec left1, left2, right1, right2;\r
+ FT_Pos target, center1, center2;\r
+ FT_Pos delta1, delta2, d1, d2;\r
+\r
+\r
+ while ( right > left && !right->link )\r
+ right--;\r
+\r
+ left1 = *left;\r
+ left2 = *left->link;\r
+ right1 = *right->link;\r
+ right2 = *right;\r
+\r
+ delta = ( ( ( hinter->pp2.x + 32 ) & -64 ) - hinter->pp2.x ) / 2;\r
+ target = left->opos + ( right->opos - left->opos ) / 2 + delta - 16;\r
+\r
+ delta1 = delta;\r
+ delta1 += af_hint_normal_stem( hints, left, left->link,\r
+ delta1, 0 );\r
+\r
+ if ( left->link != right )\r
+ af_hint_normal_stem( hints, right->link, right, delta1, 0 );\r
+\r
+ center1 = left->pos + ( right->pos - left->pos ) / 2;\r
+\r
+ if ( center1 >= target )\r
+ delta2 = delta - 32;\r
+ else\r
+ delta2 = delta + 32;\r
+\r
+ delta2 += af_hint_normal_stem( hints, &left1, &left2, delta2, 0 );\r
+\r
+ if ( delta1 != delta2 )\r
+ {\r
+ if ( left->link != right )\r
+ af_hint_normal_stem( hints, &right1, &right2, delta2, 0 );\r
+\r
+ center2 = left1.pos + ( right2.pos - left1.pos ) / 2;\r
+\r
+ d1 = center1 - target;\r
+ d2 = center2 - target;\r
+\r
+ if ( FT_ABS( d2 ) < FT_ABS( d1 ) )\r
+ {\r
+ left->pos = left1.pos;\r
+ left->link->pos = left2.pos;\r
+\r
+ if ( left->link != right )\r
+ {\r
+ right->link->pos = right1.pos;\r
+ right->pos = right2.pos;\r
+ }\r
+\r
+ delta1 = delta2;\r
+ }\r
+ }\r
+\r
+ delta = delta1;\r
+ right->link->flags |= AF_EDGE_DONE;\r
+ right->flags |= AF_EDGE_DONE;\r
+ }\r
+ else\r
+\r
+#endif /* 0 */\r
+\r
+ delta = af_hint_normal_stem( hints, edge, edge2, 0,\r
+ AF_DIMENSION_HORZ );\r
+ }\r
+ else\r
+ af_hint_normal_stem( hints, edge, edge2, delta, dim );\r
+\r
+#if 0\r
+ printf( "stem (%d,%d) adjusted (%.1f,%.1f)\n",\r
+ edge - edges, edge2 - edges,\r
+ ( edge->pos - edge->opos ) / 64.0,\r
+ ( edge2->pos - edge2->opos ) / 64.0 );\r
+#endif\r
+\r
+ anchor = edge;\r
+ edge->flags |= AF_EDGE_DONE;\r
+ edge2->flags |= AF_EDGE_DONE;\r
+ }\r
+\r
+ /* make sure that lowercase m's maintain their symmetry */\r
+\r
+ /* In general, lowercase m's have six vertical edges if they are sans */\r
+ /* serif, or twelve if they are with serifs. This implementation is */\r
+ /* based on that assumption, and seems to work very well with most */\r
+ /* faces. However, if for a certain face this assumption is not */\r
+ /* true, the m is just rendered like before. In addition, any stem */\r
+ /* correction will only be applied to symmetrical glyphs (even if the */\r
+ /* glyph is not an m), so the potential for unwanted distortion is */\r
+ /* relatively low. */\r
+\r
+ /* We don't handle horizontal edges since we can't easily assure that */\r
+ /* the third (lowest) stem aligns with the base line; it might end up */\r
+ /* one pixel higher or lower. */\r
+\r
+ n_edges = edge_limit - edges;\r
+ if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )\r
+ {\r
+ AF_Edge edge1, edge2, edge3;\r
+ FT_Pos dist1, dist2, span;\r
+\r
+\r
+ if ( n_edges == 6 )\r
+ {\r
+ edge1 = edges;\r
+ edge2 = edges + 2;\r
+ edge3 = edges + 4;\r
+ }\r
+ else\r
+ {\r
+ edge1 = edges + 1;\r
+ edge2 = edges + 5;\r
+ edge3 = edges + 9;\r
+ }\r
+\r
+ dist1 = edge2->opos - edge1->opos;\r
+ dist2 = edge3->opos - edge2->opos;\r
+\r
+ span = dist1 - dist2;\r
+ if ( span < 0 )\r
+ span = -span;\r
+\r
+ if ( edge1->link == edge1 + 1 &&\r
+ edge2->link == edge2 + 1 &&\r
+ edge3->link == edge3 + 1 && span < 8 )\r
+ {\r
+ delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );\r
+ edge3->pos -= delta;\r
+ if ( edge3->link )\r
+ edge3->link->pos -= delta;\r
+\r
+ /* move the serifs along with the stem */\r
+ if ( n_edges == 12 )\r
+ {\r
+ ( edges + 8 )->pos -= delta;\r
+ ( edges + 11 )->pos -= delta;\r
+ }\r
+\r
+ edge3->flags |= AF_EDGE_DONE;\r
+ if ( edge3->link )\r
+ edge3->link->flags |= AF_EDGE_DONE;\r
+ }\r
+ }\r
+\r
+ if ( !skipped )\r
+ return;\r
+\r
+ /*\r
+ * now hint the remaining edges (serifs and single) in order\r
+ * to complete our processing\r
+ */\r
+ for ( edge = edges; edge < edge_limit; edge++ )\r
+ {\r
+ if ( edge->flags & AF_EDGE_DONE )\r
+ continue;\r
+\r
+ if ( edge->serif )\r
+ {\r
+ af_cjk_align_serif_edge( hints, edge->serif, edge );\r
+ edge->flags |= AF_EDGE_DONE;\r
+ skipped--;\r
+ }\r
+ }\r
+\r
+ if ( !skipped )\r
+ return;\r
+\r
+ for ( edge = edges; edge < edge_limit; edge++ )\r
+ {\r
+ AF_Edge before, after;\r
+\r
+\r
+ if ( edge->flags & AF_EDGE_DONE )\r
+ continue;\r
+\r
+ before = after = edge;\r
+\r
+ while ( --before >= edges )\r
+ if ( before->flags & AF_EDGE_DONE )\r
+ break;\r
+\r
+ while ( ++after < edge_limit )\r
+ if ( after->flags & AF_EDGE_DONE )\r
+ break;\r
+\r
+ if ( before >= edges || after < edge_limit )\r
+ {\r
+ if ( before < edges )\r
+ af_cjk_align_serif_edge( hints, after, edge );\r
+ else if ( after >= edge_limit )\r
+ af_cjk_align_serif_edge( hints, before, edge );\r
+ else\r
+ edge->pos = before->pos +\r
+ FT_MulDiv( edge->fpos - before->fpos,\r
+ after->pos - before->pos,\r
+ after->fpos - before->fpos );\r
+ }\r
+ }\r
+ }\r
+\r
+\r
+ static void\r
+ af_cjk_align_edge_points( AF_GlyphHints hints,\r
+ AF_Dimension dim )\r
+ {\r
+ AF_AxisHints axis = & hints->axis[dim];\r
+ AF_Edge edges = axis->edges;\r
+ AF_Edge edge_limit = edges + axis->num_edges;\r
+ AF_Edge edge;\r
+ FT_Bool snapping;\r
+\r
+\r
+ snapping = FT_BOOL( ( dim == AF_DIMENSION_HORZ &&\r
+ AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ||\r
+ ( dim == AF_DIMENSION_VERT &&\r
+ AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) );\r
+\r
+ for ( edge = edges; edge < edge_limit; edge++ )\r
+ {\r
+ /* move the points of each segment */\r
+ /* in each edge to the edge's position */\r
+ AF_Segment seg = edge->first;\r
+\r
+\r
+ if ( snapping )\r
+ {\r
+ do\r
+ {\r
+ AF_Point point = seg->first;\r
+\r
+\r
+ for (;;)\r
+ {\r
+ if ( dim == AF_DIMENSION_HORZ )\r
+ {\r
+ point->x = edge->pos;\r
+ point->flags |= AF_FLAG_TOUCH_X;\r
+ }\r
+ else\r
+ {\r
+ point->y = edge->pos;\r
+ point->flags |= AF_FLAG_TOUCH_Y;\r
+ }\r
+\r
+ if ( point == seg->last )\r
+ break;\r
+\r
+ point = point->next;\r
+ }\r
+\r
+ seg = seg->edge_next;\r
+\r
+ } while ( seg != edge->first );\r
+ }\r
+ else\r
+ {\r
+ FT_Pos delta = edge->pos - edge->opos;\r
+\r
+\r
+ do\r
+ {\r
+ AF_Point point = seg->first;\r
+\r
+\r
+ for (;;)\r
+ {\r
+ if ( dim == AF_DIMENSION_HORZ )\r
+ {\r
+ point->x += delta;\r
+ point->flags |= AF_FLAG_TOUCH_X;\r
+ }\r
+ else\r
+ {\r
+ point->y += delta;\r
+ point->flags |= AF_FLAG_TOUCH_Y;\r
+ }\r
+\r
+ if ( point == seg->last )\r
+ break;\r
+\r
+ point = point->next;\r
+ }\r
+\r
+ seg = seg->edge_next;\r
+\r
+ } while ( seg != edge->first );\r
+ }\r
+ }\r
+ }\r
+\r
+\r
+ static FT_Error\r
+ af_cjk_hints_apply( AF_GlyphHints hints,\r
+ FT_Outline* outline,\r
+ AF_LatinMetrics metrics )\r
+ {\r
+ FT_Error error;\r
+ int dim;\r
+\r
+ FT_UNUSED( metrics );\r
+\r
+\r
+ error = af_glyph_hints_reload( hints, outline, 0 );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ /* analyze glyph outline */\r
+ if ( AF_HINTS_DO_HORIZONTAL( hints ) )\r
+ {\r
+ error = af_cjk_hints_detect_features( hints, AF_DIMENSION_HORZ );\r
+ if ( error )\r
+ goto Exit;\r
+ }\r
+\r
+ if ( AF_HINTS_DO_VERTICAL( hints ) )\r
+ {\r
+ error = af_cjk_hints_detect_features( hints, AF_DIMENSION_VERT );\r
+ if ( error )\r
+ goto Exit;\r
+ }\r
+\r
+ /* grid-fit the outline */\r
+ for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )\r
+ {\r
+ if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||\r
+ ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) )\r
+ {\r
+\r
+#ifdef AF_USE_WARPER\r
+ if ( dim == AF_DIMENSION_HORZ &&\r
+ metrics->root.scaler.render_mode == FT_RENDER_MODE_NORMAL )\r
+ {\r
+ AF_WarperRec warper;\r
+ FT_Fixed scale;\r
+ FT_Pos delta;\r
+\r
+\r
+ af_warper_compute( &warper, hints, dim, &scale, &delta );\r
+ af_glyph_hints_scale_dim( hints, dim, scale, delta );\r
+ continue;\r
+ }\r
+#endif /* AF_USE_WARPER */\r
+\r
+ af_cjk_hint_edges( hints, (AF_Dimension)dim );\r
+ af_cjk_align_edge_points( hints, (AF_Dimension)dim );\r
+ af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim );\r
+ af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim );\r
+ }\r
+ }\r
+\r
+#if 0\r
+ af_glyph_hints_dump_points( hints );\r
+ af_glyph_hints_dump_segments( hints );\r
+ af_glyph_hints_dump_edges( hints );\r
+#endif\r
+\r
+ af_glyph_hints_save( hints, outline );\r
+\r
+ Exit:\r
+ return error;\r
+ }\r
+\r
+\r
+ /*************************************************************************/\r
+ /*************************************************************************/\r
+ /***** *****/\r
+ /***** C J K S C R I P T C L A S S *****/\r
+ /***** *****/\r
+ /*************************************************************************/\r
+ /*************************************************************************/\r
+\r
+\r
+ static const AF_Script_UniRangeRec af_cjk_uniranges[] =\r
+ {\r
+#if 0\r
+ { 0x0100, 0xFFFF }, /* why this? */\r
+#endif\r
+ { 0x2E80, 0x2EFF }, /* CJK Radicals Supplement */\r
+ { 0x2F00, 0x2FDF }, /* Kangxi Radicals */\r
+ { 0x3000, 0x303F }, /* CJK Symbols and Punctuation */\r
+ { 0x3040, 0x309F }, /* Hiragana */\r
+ { 0x30A0, 0x30FF }, /* Katakana */\r
+ { 0x3100, 0x312F }, /* Bopomofo */\r
+ { 0x3130, 0x318F }, /* Hangul Compatibility Jamo */\r
+ { 0x31A0, 0x31BF }, /* Bopomofo Extended */\r
+ { 0x31C0, 0x31EF }, /* CJK Strokes */\r
+ { 0x31F0, 0x31FF }, /* Katakana Phonetic Extensions */\r
+ { 0x3200, 0x32FF }, /* Enclosed CJK Letters and Months */\r
+ { 0x3300, 0x33FF }, /* CJK Compatibility */\r
+ { 0x3400, 0x4DBF }, /* CJK Unified Ideographs Extension A */\r
+ { 0x4DC0, 0x4DFF }, /* Yijing Hexagram Symbols */\r
+ { 0x4E00, 0x9FFF }, /* CJK Unified Ideographs */\r
+ { 0xF900, 0xFAFF }, /* CJK Compatibility Ideographs */\r
+ { 0xFE30, 0xFE4F }, /* CJK Compatibility Forms */\r
+ { 0xFF00, 0xFFEF }, /* Halfwidth and Fullwidth Forms */\r
+ { 0x20000, 0x2A6DF }, /* CJK Unified Ideographs Extension B */\r
+ { 0x2F800, 0x2FA1F }, /* CJK Compatibility Ideographs Supplement */\r
+ { 0, 0 }\r
+ };\r
+\r
+\r
+ FT_CALLBACK_TABLE_DEF const AF_ScriptClassRec\r
+ af_cjk_script_class =\r
+ {\r
+ AF_SCRIPT_CJK,\r
+ af_cjk_uniranges,\r
+\r
+ sizeof( AF_LatinMetricsRec ),\r
+\r
+ (AF_Script_InitMetricsFunc) af_cjk_metrics_init,\r
+ (AF_Script_ScaleMetricsFunc)af_cjk_metrics_scale,\r
+ (AF_Script_DoneMetricsFunc) NULL,\r
+\r
+ (AF_Script_InitHintsFunc) af_cjk_hints_init,\r
+ (AF_Script_ApplyHintsFunc) af_cjk_hints_apply\r
+ };\r
+\r
+#else /* !AF_CONFIG_OPTION_CJK */\r
+\r
+ static const AF_Script_UniRangeRec af_cjk_uniranges[] =\r
+ {\r
+ { 0, 0 }\r
+ };\r
+\r
+\r
+ FT_CALLBACK_TABLE_DEF const AF_ScriptClassRec\r
+ af_cjk_script_class =\r
+ {\r
+ AF_SCRIPT_CJK,\r
+ af_cjk_uniranges,\r
+\r
+ sizeof( AF_LatinMetricsRec ),\r
+\r
+ (AF_Script_InitMetricsFunc) NULL,\r
+ (AF_Script_ScaleMetricsFunc)NULL,\r
+ (AF_Script_DoneMetricsFunc) NULL,\r
+\r
+ (AF_Script_InitHintsFunc) NULL,\r
+ (AF_Script_ApplyHintsFunc) NULL\r
+ };\r
+\r
+#endif /* !AF_CONFIG_OPTION_CJK */\r
+\r
+\r
+/* END */\r
projects / reactos.git / blobdiff