ref: 03ceda9701cd8c08ea5b4ee0c2d558a98fc4ed7d
dir: /src/autofit/aflatin2.c/
/* ATTENTION: This file doesn't compile. It is only here as a reference */
/* of an alternative latin hinting algorithm that was always */
/* marked as experimental. */
/****************************************************************************
*
* aflatin2.c
*
* Auto-fitter hinting routines for latin writing system (body).
*
* Copyright (C) 2003-2020 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.
*
*/
#include <freetype/ftadvanc.h>
#ifdef FT_OPTION_AUTOFIT2
#include "afglobal.h"
#include "aflatin.h"
#include "aflatin2.h"
#include "aferrors.h"
#ifdef AF_CONFIG_OPTION_USE_WARPER
#include "afwarp.h"
#endif
/**************************************************************************
*
* The macro FT_COMPONENT is used in trace mode. It is an implicit
* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
* messages during execution.
*/
#undef FT_COMPONENT
#define FT_COMPONENT aflatin2
FT_LOCAL_DEF( FT_Error )
af_latin2_hints_compute_segments( AF_GlyphHints hints,
AF_Dimension dim );
FT_LOCAL_DEF( void )
af_latin2_hints_link_segments( AF_GlyphHints hints,
AF_Dimension dim );
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** L A T I N G L O B A L M E T R I C S *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( void )
af_latin2_metrics_init_widths( AF_LatinMetrics metrics,
FT_Face face )
{
/* scan the array of segments in each direction */
AF_GlyphHintsRec hints[1];
af_glyph_hints_init( hints, face->memory );
metrics->axis[AF_DIMENSION_HORZ].width_count = 0;
metrics->axis[AF_DIMENSION_VERT].width_count = 0;
{
FT_Error error;
FT_UInt glyph_index;
int dim;
AF_LatinMetricsRec dummy[1];
AF_Scaler scaler = &dummy->root.scaler;
glyph_index = FT_Get_Char_Index(
face,
metrics->root.style_class->standard_char );
if ( glyph_index == 0 )
goto Exit;
error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
if ( error || face->glyph->outline.n_points <= 0 )
goto Exit;
FT_ZERO( dummy );
dummy->units_per_em = metrics->units_per_em;
scaler->x_scale = scaler->y_scale = 0x10000L;
scaler->x_delta = scaler->y_delta = 0;
scaler->face = face;
scaler->render_mode = FT_RENDER_MODE_NORMAL;
scaler->flags = 0;
af_glyph_hints_rescale( hints, (AF_StyleMetrics)dummy );
error = af_glyph_hints_reload( hints, &face->glyph->outline );
if ( error )
goto Exit;
for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
{
AF_LatinAxis axis = &metrics->axis[dim];
AF_AxisHints axhints = &hints->axis[dim];
AF_Segment seg, limit, link;
FT_UInt num_widths = 0;
error = af_latin2_hints_compute_segments( hints,
(AF_Dimension)dim );
if ( error )
goto Exit;
af_latin2_hints_link_segments( hints,
(AF_Dimension)dim );
seg = axhints->segments;
limit = seg + axhints->num_segments;
for ( ; seg < limit; seg++ )
{
link = seg->link;
/* we only consider stem segments there! */
if ( link && link->link == seg && link > seg )
{
FT_Pos dist;
dist = seg->pos - link->pos;
if ( dist < 0 )
dist = -dist;
if ( num_widths < AF_LATIN_MAX_WIDTHS )
axis->widths[num_widths++].org = dist;
}
}
af_sort_widths( num_widths, axis->widths );
axis->width_count = num_widths;
}
Exit:
for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
{
AF_LatinAxis axis = &metrics->axis[dim];
FT_Pos stdw;
stdw = ( axis->width_count > 0 )
? axis->widths[0].org
: AF_LATIN_CONSTANT( metrics, 50 );
/* let's try 20% of the smallest width */
axis->edge_distance_threshold = stdw / 5;
axis->standard_width = stdw;
axis->extra_light = 0;
}
}
af_glyph_hints_done( hints );
}
#define AF_LATIN_MAX_TEST_CHARACTERS 12
static const char af_latin2_blue_chars[AF_LATIN_MAX_BLUES]
[AF_LATIN_MAX_TEST_CHARACTERS+1] =
{
"THEZOCQS",
"HEZLOCUS",
"fijkdbh",
"xzroesc",
"xzroesc",
"pqgjy"
};
static void
af_latin2_metrics_init_blues( AF_LatinMetrics metrics,
FT_Face face )
{
FT_Pos flats [AF_LATIN_MAX_TEST_CHARACTERS];
FT_Pos rounds[AF_LATIN_MAX_TEST_CHARACTERS];
FT_Int num_flats;
FT_Int num_rounds;
FT_Int bb;
AF_LatinBlue blue;
FT_Error error;
AF_LatinAxis axis = &metrics->axis[AF_DIMENSION_VERT];
FT_GlyphSlot glyph = face->glyph;
/* we compute the blues simply by loading each character from the */
/* 'af_latin2_blue_chars[blues]' string, then compute its top-most or */
/* bottom-most points (depending on `AF_IS_TOP_BLUE') */
FT_TRACE5(( "blue zones computation\n" ));
FT_TRACE5(( "======================\n" ));
FT_TRACE5(( "\n" ));
for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ )
{
const char* p = af_latin2_blue_chars[bb];
const char* limit = p + AF_LATIN_MAX_TEST_CHARACTERS;
FT_Pos* blue_ref;
FT_Pos* blue_shoot;
FT_TRACE5(( "blue zone %d:\n", bb ));
num_flats = 0;
num_rounds = 0;
for ( ; p < limit && *p; p++ )
{
FT_UInt glyph_index;
FT_Int best_point, best_y, best_first, best_last;
FT_Vector* points;
FT_Bool round;
/* load the character in the face -- skip unknown or empty ones */
glyph_index = FT_Get_Char_Index( face, (FT_UInt)*p );
if ( glyph_index == 0 )
continue;
error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
if ( error || glyph->outline.n_points <= 0 )
continue;
/* now compute min or max point indices and coordinates */
points = glyph->outline.points;
best_point = -1;
best_y = 0; /* make compiler happy */
best_first = 0; /* ditto */
best_last = 0; /* ditto */
{
FT_Int nn;
FT_Int first = 0;
FT_Int last = -1;
for ( nn = 0; nn < glyph->outline.n_contours; first = last+1, nn++ )
{
FT_Int old_best_point = best_point;
FT_Int pp;
last = glyph->outline.contours[nn];
/* Avoid single-point contours since they are never rasterized. */
/* In some fonts, they correspond to mark attachment points */
/* which are way outside of the glyph's real outline. */
if ( last <= first )
continue;
if ( AF_LATIN_IS_TOP_BLUE( bb ) )
{
for ( pp = first; pp <= last; pp++ )
if ( best_point < 0 || points[pp].y > best_y )
{
best_point = pp;
best_y = points[pp].y;
}
}
else
{
for ( pp = first; pp <= last; pp++ )
if ( best_point < 0 || points[pp].y < best_y )
{
best_point = pp;
best_y = points[pp].y;
}
}
if ( best_point != old_best_point )
{
best_first = first;
best_last = last;
}
}
FT_TRACE5(( " %c %d", *p, best_y ));
}
/* now check whether the point belongs to a straight or round */
/* segment; we first need to find in which contour the extremum */
/* lies, then inspect its previous and next points */
if ( best_point >= 0 )
{
FT_Pos best_x = points[best_point].x;
FT_Int start, end, prev, next;
FT_Pos dist;
/* now look for the previous and next points that are not on the */
/* same Y coordinate. Threshold the `closeness'... */
start = end = best_point;
do
{
prev = start - 1;
if ( prev < best_first )
prev = best_last;
dist = FT_ABS( points[prev].y - best_y );
/* accept a small distance or a small angle (both values are */
/* heuristic; value 20 corresponds to approx. 2.9 degrees) */
if ( dist > 5 )
if ( FT_ABS( points[prev].x - best_x ) <= 20 * dist )
break;
start = prev;
} while ( start != best_point );
do
{
next = end + 1;
if ( next > best_last )
next = best_first;
dist = FT_ABS( points[next].y - best_y );
if ( dist > 5 )
if ( FT_ABS( points[next].x - best_x ) <= 20 * dist )
break;
end = next;
} while ( end != best_point );
/* now, set the `round' flag depending on the segment's kind */
round = FT_BOOL(
FT_CURVE_TAG( glyph->outline.tags[start] ) != FT_CURVE_TAG_ON ||
FT_CURVE_TAG( glyph->outline.tags[ end ] ) != FT_CURVE_TAG_ON );
FT_TRACE5(( " (%s)\n", round ? "round" : "flat" ));
}
if ( round )
rounds[num_rounds++] = best_y;
else
flats[num_flats++] = best_y;
}
if ( num_flats == 0 && num_rounds == 0 )
{
/*
* we couldn't find a single glyph to compute this blue zone,
* we will simply ignore it then
*/
FT_TRACE5(( " empty\n" ));
continue;
}
/* we have computed the contents of the `rounds' and `flats' tables, */
/* now determine the reference and overshoot position of the blue -- */
/* we simply take the median value after a simple sort */
af_sort_pos( num_rounds, rounds );
af_sort_pos( num_flats, flats );
blue = & axis->blues[axis->blue_count];
blue_ref = & blue->ref.org;
blue_shoot = & blue->shoot.org;
axis->blue_count++;
if ( num_flats == 0 )
{
*blue_ref =
*blue_shoot = rounds[num_rounds / 2];
}
else if ( num_rounds == 0 )
{
*blue_ref =
*blue_shoot = flats[num_flats / 2];
}
else
{
*blue_ref = flats[num_flats / 2];
*blue_shoot = rounds[num_rounds / 2];
}
/* there are sometimes problems: if the overshoot position of top */
/* zones is under its reference position, or the opposite for bottom */
/* zones. We must thus check everything there and correct the errors */
if ( *blue_shoot != *blue_ref )
{
FT_Pos ref = *blue_ref;
FT_Pos shoot = *blue_shoot;
FT_Bool over_ref = FT_BOOL( shoot > ref );
if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref )
{
*blue_ref =
*blue_shoot = ( shoot + ref ) / 2;
FT_TRACE5(( " [overshoot smaller than reference,"
" taking mean value]\n" ));
}
}
blue->flags = 0;
if ( AF_LATIN_IS_TOP_BLUE( bb ) )
blue->flags |= AF_LATIN_BLUE_TOP;
/*
* The following flag is used later to adjust the y and x scales
* in order to optimize the pixel grid alignment of the top of small
* letters.
*/
if ( AF_LATIN_IS_X_HEIGHT_BLUE( bb ) )
blue->flags |= AF_LATIN_BLUE_ADJUSTMENT;
FT_TRACE5(( " -> reference = %ld\n", *blue_ref ));
FT_TRACE5(( " overshoot = %ld\n", *blue_shoot ));
}
return;
}
FT_LOCAL_DEF( void )
af_latin2_metrics_check_digits( AF_LatinMetrics metrics,
FT_Face face )
{
FT_UInt i;
FT_Bool started = 0, same_width = 1;
FT_Fixed advance, old_advance = 0;
/* check whether all ASCII digits have the same advance width; */
/* digit `0' is 0x30 in all supported charmaps */
for ( i = 0x30; i <= 0x39; i++ )
{
FT_UInt glyph_index;
glyph_index = FT_Get_Char_Index( face, i );
if ( glyph_index == 0 )
continue;
if ( FT_Get_Advance( face, glyph_index,
FT_LOAD_NO_SCALE |
FT_LOAD_NO_HINTING |
FT_LOAD_IGNORE_TRANSFORM,
&advance ) )
continue;
if ( started )
{
if ( advance != old_advance )
{
same_width = 0;
break;
}
}
else
{
old_advance = advance;
started = 1;
}
}
metrics->root.digits_have_same_width = same_width;
}
FT_LOCAL_DEF( FT_Error )
af_latin2_metrics_init( AF_LatinMetrics metrics,
FT_Face face )
{
FT_Error error = FT_Err_Ok;
FT_CharMap oldmap = face->charmap;
FT_UInt ee;
static const FT_Encoding latin_encodings[] =
{
FT_ENCODING_UNICODE,
FT_ENCODING_APPLE_ROMAN,
FT_ENCODING_ADOBE_STANDARD,
FT_ENCODING_ADOBE_LATIN_1,
FT_ENCODING_NONE /* end of list */
};
metrics->units_per_em = face->units_per_EM;
/* do we have a latin charmap in there? */
for ( ee = 0; latin_encodings[ee] != FT_ENCODING_NONE; ee++ )
{
error = FT_Select_Charmap( face, latin_encodings[ee] );
if ( !error )
break;
}
if ( !error )
{
af_latin2_metrics_init_widths( metrics, face );
af_latin2_metrics_init_blues( metrics, face );
af_latin2_metrics_check_digits( metrics, face );
}
FT_Set_Charmap( face, oldmap );
return FT_Err_Ok;
}
static void
af_latin2_metrics_scale_dim( AF_LatinMetrics metrics,
AF_Scaler scaler,
AF_Dimension dim )
{
FT_Fixed scale;
FT_Pos delta;
AF_LatinAxis axis;
FT_UInt nn;
if ( dim == AF_DIMENSION_HORZ )
{
scale = scaler->x_scale;
delta = scaler->x_delta;
}
else
{
scale = scaler->y_scale;
delta = scaler->y_delta;
}
axis = &metrics->axis[dim];
if ( axis->org_scale == scale && axis->org_delta == delta )
return;
axis->org_scale = scale;
axis->org_delta = delta;
/*
* correct Y scale to optimize the alignment of the top of small
* letters to the pixel grid
*/
if ( dim == AF_DIMENSION_VERT )
{
AF_LatinAxis vaxis = &metrics->axis[AF_DIMENSION_VERT];
AF_LatinBlue blue = NULL;
for ( nn = 0; nn < vaxis->blue_count; nn++ )
{
if ( vaxis->blues[nn].flags & AF_LATIN_BLUE_ADJUSTMENT )
{
blue = &vaxis->blues[nn];
break;
}
}
if ( blue )
{
FT_Pos scaled;
FT_Pos threshold;
FT_Pos fitted;
FT_UInt limit;
FT_UInt ppem;
scaled = FT_MulFix( blue->shoot.org, scaler->y_scale );
ppem = metrics->root.scaler.face->size->metrics.x_ppem;
limit = metrics->root.globals->increase_x_height;
threshold = 40;
/* if the `increase-x-height' property is active, */
/* we round up much more often */
if ( limit &&
ppem <= limit &&
ppem >= AF_PROP_INCREASE_X_HEIGHT_MIN )
threshold = 52;
fitted = ( scaled + threshold ) & ~63;
#if 1
if ( scaled != fitted )
{
scale = FT_MulDiv( scale, fitted, scaled );
FT_TRACE5(( "== scaled x-top = %.2g"
" fitted = %.2g, scaling = %.4g\n",
scaled / 64.0, fitted / 64.0,
( fitted * 1.0 ) / scaled ));
}
#endif
}
}
axis->scale = scale;
axis->delta = delta;
if ( dim == AF_DIMENSION_HORZ )
{
metrics->root.scaler.x_scale = scale;
metrics->root.scaler.x_delta = delta;
}
else
{
metrics->root.scaler.y_scale = scale;
metrics->root.scaler.y_delta = delta;
}
/* scale the standard widths */
for ( nn = 0; nn < axis->width_count; nn++ )
{
AF_Width width = axis->widths + nn;
width->cur = FT_MulFix( width->org, scale );
width->fit = width->cur;
}
/* an extra-light axis corresponds to a standard width that is */
/* smaller than 5/8 pixels */
axis->extra_light =
FT_BOOL( FT_MulFix( axis->standard_width, scale ) < 32 + 8 );
if ( dim == AF_DIMENSION_VERT )
{
/* scale the blue zones */
for ( nn = 0; nn < axis->blue_count; nn++ )
{
AF_LatinBlue blue = &axis->blues[nn];
FT_Pos dist;
blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta;
blue->ref.fit = blue->ref.cur;
blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta;
blue->shoot.fit = blue->shoot.cur;
blue->flags &= ~AF_LATIN_BLUE_ACTIVE;
/* a blue zone is only active if it is less than 3/4 pixels tall */
dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale );
if ( dist <= 48 && dist >= -48 )
{
FT_Pos delta1, delta2;
delta1 = blue->shoot.org - blue->ref.org;
delta2 = delta1;
if ( delta1 < 0 )
delta2 = -delta2;
delta2 = FT_MulFix( delta2, scale );
if ( delta2 < 32 )
delta2 = 0;
else if ( delta2 < 64 )
delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 );
else
delta2 = FT_PIX_ROUND( delta2 );
if ( delta1 < 0 )
delta2 = -delta2;
blue->ref.fit = FT_PIX_ROUND( blue->ref.cur );
blue->shoot.fit = blue->ref.fit + delta2;
FT_TRACE5(( ">> activating blue zone %d:"
" ref.cur=%.2g ref.fit=%.2g"
" shoot.cur=%.2g shoot.fit=%.2g\n",
nn, blue->ref.cur / 64.0, blue->ref.fit / 64.0,
blue->shoot.cur / 64.0, blue->shoot.fit / 64.0 ));
blue->flags |= AF_LATIN_BLUE_ACTIVE;
}
}
}
}
FT_LOCAL_DEF( void )
af_latin2_metrics_scale( AF_LatinMetrics metrics,
AF_Scaler scaler )
{
metrics->root.scaler.render_mode = scaler->render_mode;
metrics->root.scaler.face = scaler->face;
metrics->root.scaler.flags = scaler->flags;
af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );
af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT );
}
/* Extract standard_width from writing system/script specific */
/* metrics class. */
FT_LOCAL_DEF( void )
af_latin2_get_standard_widths( AF_LatinMetrics metrics,
FT_Pos* stdHW,
FT_Pos* stdVW )
{
if ( stdHW )
*stdHW = metrics->axis[AF_DIMENSION_VERT].standard_width;
if ( stdVW )
*stdVW = metrics->axis[AF_DIMENSION_HORZ].standard_width;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** L A T I N G L Y P H A N A L Y S I S *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
#define SORT_SEGMENTS
FT_LOCAL_DEF( FT_Error )
af_latin2_hints_compute_segments( AF_GlyphHints hints,
AF_Dimension dim )
{
AF_AxisHints axis = &hints->axis[dim];
FT_Memory memory = hints->memory;
FT_Error error = FT_Err_Ok;
AF_Segment segment = NULL;
AF_SegmentRec seg0;
AF_Point* contour = hints->contours;
AF_Point* contour_limit = contour + hints->num_contours;
AF_Direction major_dir, segment_dir;
FT_ZERO( &seg0 );
seg0.score = 32000;
seg0.flags = AF_EDGE_NORMAL;
major_dir = (AF_Direction)FT_ABS( axis->major_dir );
segment_dir = major_dir;
axis->num_segments = 0;
/* set up (u,v) in each point */
if ( dim == AF_DIMENSION_HORZ )
{
AF_Point point = hints->points;
AF_Point limit = point + hints->num_points;
for ( ; point < limit; point++ )
{
point->u = point->fx;
point->v = point->fy;
}
}
else
{
AF_Point point = hints->points;
AF_Point limit = point + hints->num_points;
for ( ; point < limit; point++ )
{
point->u = point->fy;
point->v = point->fx;
}
}
/* do each contour separately */
for ( ; contour < contour_limit; contour++ )
{
AF_Point point = contour[0];
AF_Point start = point;
AF_Point last = point->prev;
if ( point == last ) /* skip singletons -- just in case */
continue;
/* already on an edge ?, backtrack to find its start */
if ( FT_ABS( point->in_dir ) == major_dir )
{
point = point->prev;
while ( point->in_dir == start->in_dir )
point = point->prev;
}
else /* otherwise, find first segment start, if any */
{
while ( FT_ABS( point->out_dir ) != major_dir )
{
point = point->next;
if ( point == start )
goto NextContour;
}
}
start = point;
for (;;)
{
AF_Point first;
FT_Pos min_u, min_v, max_u, max_v;
/* we're at the start of a new segment */
FT_ASSERT( FT_ABS( point->out_dir ) == major_dir &&
point->in_dir != point->out_dir );
first = point;
min_u = max_u = point->u;
min_v = max_v = point->v;
point = point->next;
while ( point->out_dir == first->out_dir )
{
point = point->next;
if ( point->u < min_u )
min_u = point->u;
if ( point->u > max_u )
max_u = point->u;
}
if ( point->v < min_v )
min_v = point->v;
if ( point->v > max_v )
max_v = point->v;
/* record new segment */
error = af_axis_hints_new_segment( axis, memory, &segment );
if ( error )
goto Exit;
segment[0] = seg0;
segment->dir = first->out_dir;
segment->first = first;
segment->last = point;
segment->pos = (FT_Short)( ( min_u + max_u ) >> 1 );
segment->min_coord = (FT_Short) min_v;
segment->max_coord = (FT_Short) max_v;
segment->height = (FT_Short)( max_v - min_v );
/* a segment is round if it doesn't have successive */
/* on-curve points. */
{
AF_Point pt = first;
AF_Point last = point;
FT_UInt f0 = pt->flags & AF_FLAG_CONTROL;
FT_UInt f1;
segment->flags &= ~AF_EDGE_ROUND;
for ( ; pt != last; f0 = f1 )
{
pt = pt->next;
f1 = pt->flags & AF_FLAG_CONTROL;
if ( !f0 && !f1 )
break;
if ( pt == last )
segment->flags |= AF_EDGE_ROUND;
}
}
/* this can happen in the case of a degenerate contour
* e.g. a 2-point vertical contour
*/
if ( point == start )
break;
/* jump to the start of the next segment, if any */
while ( FT_ABS( point->out_dir ) != major_dir )
{
point = point->next;
if ( point == start )
goto NextContour;
}
}
NextContour:
;
} /* contours */
/* now slightly increase the height of segments when this makes */
/* sense -- this is used to better detect and ignore serifs */
{
AF_Segment segments = axis->segments;
AF_Segment segments_end = segments + axis->num_segments;
for ( segment = segments; segment < segments_end; segment++ )
{
AF_Point first = segment->first;
AF_Point last = segment->last;
AF_Point p;
FT_Pos first_v = first->v;
FT_Pos last_v = last->v;
if ( first_v < last_v )
{
p = first->prev;
if ( p->v < first_v )
segment->height = (FT_Short)( segment->height +
( ( first_v - p->v ) >> 1 ) );
p = last->next;
if ( p->v > last_v )
segment->height = (FT_Short)( segment->height +
( ( p->v - last_v ) >> 1 ) );
}
else
{
p = first->prev;
if ( p->v > first_v )
segment->height = (FT_Short)( segment->height +
( ( p->v - first_v ) >> 1 ) );
p = last->next;
if ( p->v < last_v )
segment->height = (FT_Short)( segment->height +
( ( last_v - p->v ) >> 1 ) );
}
}
}
#ifdef AF_SORT_SEGMENTS
/* place all segments with a negative direction to the start
* of the array, used to speed up segment linking later...
*/
{
AF_Segment segments = axis->segments;
FT_UInt count = axis->num_segments;
FT_UInt ii, jj;
for ( ii = 0; ii < count; ii++ )
{
if ( segments[ii].dir > 0 )
{
for ( jj = ii + 1; jj < count; jj++ )
{
if ( segments[jj].dir < 0 )
{
AF_SegmentRec tmp;
tmp = segments[ii];
segments[ii] = segments[jj];
segments[jj] = tmp;
break;
}
}
if ( jj == count )
break;
}
}
axis->mid_segments = ii;
}
#endif
Exit:
return error;
}
FT_LOCAL_DEF( void )
af_latin2_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;
#ifdef AF_SORT_SEGMENTS
AF_Segment segment_mid = segments + axis->mid_segments;
#endif
FT_Pos len_threshold, len_score;
AF_Segment seg1, seg2;
len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 );
if ( len_threshold == 0 )
len_threshold = 1;
len_score = AF_LATIN_CONSTANT( hints->metrics, 6000 );
#ifdef AF_SORT_SEGMENTS
for ( seg1 = segments; seg1 < segment_mid; seg1++ )
{
if ( seg1->dir != axis->major_dir )
continue;
for ( seg2 = segment_mid; seg2 < segment_limit; seg2++ )
#else
/* now compare each segment to the others */
for ( seg1 = segments; seg1 < segment_limit; seg1++ )
{
if ( seg1->dir != axis->major_dir )
continue;
for ( seg2 = segments; seg2 < segment_limit; seg2++ )
if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos )
#endif
{
FT_Pos pos1 = seg1->pos;
FT_Pos pos2 = seg2->pos;
FT_Pos dist = pos2 - pos1;
if ( dist < 0 )
continue;
{
FT_Pos min = seg1->min_coord;
FT_Pos max = seg1->max_coord;
FT_Pos len, score;
if ( min < seg2->min_coord )
min = seg2->min_coord;
if ( max > seg2->max_coord )
max = seg2->max_coord;
len = max - min;
if ( len >= len_threshold )
{
score = dist + len_score / len;
if ( score < seg1->score )
{
seg1->score = score;
seg1->link = seg2;
}
if ( score < seg2->score )
{
seg2->score = score;
seg2->link = seg1;
}
}
}
}
}
#if 0
}
#endif
/* now, compute the `serif' segments */
for ( seg1 = segments; seg1 < segment_limit; seg1++ )
{
seg2 = seg1->link;
if ( seg2 )
{
if ( seg2->link != seg1 )
{
seg1->link = NULL;
seg1->serif = seg2->link;
}
}
}
}
FT_LOCAL_DEF( FT_Error )
af_latin2_hints_compute_edges( AF_GlyphHints hints,
AF_Dimension dim )
{
AF_AxisHints axis = &hints->axis[dim];
FT_Error error = FT_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;
AF_Direction up_dir;
FT_Fixed scale;
FT_Pos edge_distance_threshold;
FT_Pos segment_length_threshold;
axis->num_edges = 0;
scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
: hints->y_scale;
up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP
: AF_DIR_RIGHT;
/*
* We want to ignore very small (mostly serif) segments, we do that
* by ignoring those that whose length is less than a given fraction
* of the standard width. If there is no standard width, we ignore
* those that are less than a given size in pixels
*
* also, unlink serif segments that are linked to segments farther
* than 50% of the standard width
*/
if ( dim == AF_DIMENSION_HORZ )
{
if ( laxis->width_count > 0 )
segment_length_threshold = ( laxis->standard_width * 10 ) >> 4;
else
segment_length_threshold = FT_DivFix( 64, hints->y_scale );
}
else
segment_length_threshold = 0;
/**********************************************************************
*
* We will begin by generating a sorted table of edges for the
* current direction. To do so, we simply scan each segment and try
* to find an edge in our table that corresponds to its position.
*
* If no edge is found, we create and insert a new edge in the
* sorted table. Otherwise, we simply add the segment to the edge's
* list which will be processed in the second step to compute the
* edge's properties.
*
* Note that the edges table is sorted along the segment/edge
* position.
*
*/
edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold,
scale );
if ( edge_distance_threshold > 64 / 4 )
edge_distance_threshold = 64 / 4;
edge_distance_threshold = FT_DivFix( edge_distance_threshold,
scale );
for ( seg = segments; seg < segment_limit; seg++ )
{
AF_Edge found = NULL;
FT_Int ee;
if ( seg->height < segment_length_threshold )
continue;
/* A special case for serif edges: If they are smaller than */
/* 1.5 pixels we ignore them. */
if ( seg->serif )
{
FT_Pos dist = seg->serif->pos - seg->pos;
if ( dist < 0 )
dist = -dist;
if ( dist >= laxis->standard_width >> 1 )
{
/* unlink this serif, it is too distant from its reference stem */
seg->serif = NULL;
}
else if ( 2*seg->height < 3 * segment_length_threshold )
continue;
}
/* 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;
dist = seg->pos - edge->fpos;
if ( dist < 0 )
dist = -dist;
if ( dist < edge_distance_threshold && edge->dir == seg->dir )
{
found = edge;
break;
}
}
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, 0,
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->dir = seg->dir;
edge->fpos = seg->pos;
edge->opos = FT_MulFix( seg->pos, scale );
edge->pos = edge->opos;
seg->edge_next = seg;
}
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 will now compute each edge's properties according to
* segments found on its position. Basically, these are:
*
* - edge's main direction
* - stem edge, serif edge or both (which defaults to stem then)
* - rounded edge, straight or both (which defaults to straight)
* - link for edge
*
*/
/* first of all, set the `edge' field in each segment -- this is */
/* required in order to compute edge links */
/*
* Note that 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? */
#if 0
FT_Pos ups = 0; /* number of upwards segments */
FT_Pos downs = 0; /* number of downwards segments */
#endif
seg = edge->first;
do
{
FT_Bool is_serif;
/* check for roundness of segment */
if ( seg->flags & AF_EDGE_ROUND )
is_round++;
else
is_straight++;
#if 0
/* check for segment direction */
if ( seg->dir == up_dir )
ups += seg->max_coord-seg->min_coord;
else
downs += seg->max_coord-seg->min_coord;
#endif
/* check for links -- if seg->serif is set, then seg->link must */
/* be ignored */
is_serif = FT_BOOL( seg->serif &&
seg->serif->edge &&
seg->serif->edge != edge );
if ( ( seg->link && seg->link->edge ) || is_serif )
{
AF_Edge edge2;
AF_Segment seg2;
edge2 = edge->link;
seg2 = seg->link;
if ( is_serif )
{
seg2 = seg->serif;
edge2 = edge->serif;
}
if ( edge2 )
{
FT_Pos edge_delta;
FT_Pos seg_delta;
edge_delta = edge->fpos - edge2->fpos;
if ( edge_delta < 0 )
edge_delta = -edge_delta;
seg_delta = seg->pos - seg2->pos;
if ( seg_delta < 0 )
seg_delta = -seg_delta;
if ( seg_delta < edge_delta )
edge2 = seg2->edge;
}
else
edge2 = seg2->edge;
if ( is_serif )
{
edge->serif = edge2;
edge2->flags |= AF_EDGE_SERIF;
}
else
edge->link = edge2;
}
seg = seg->edge_next;
} while ( seg != edge->first );
/* set the round/straight flags */
edge->flags = AF_EDGE_NORMAL;
if ( is_round > 0 && is_round >= is_straight )
edge->flags |= AF_EDGE_ROUND;
#if 0
/* set the edge's main direction */
edge->dir = AF_DIR_NONE;
if ( ups > downs )
edge->dir = (FT_Char)up_dir;
else if ( ups < downs )
edge->dir = (FT_Char)-up_dir;
else if ( ups == downs )
edge->dir = 0; /* both up and down! */
#endif
/* gets rid of serifs if link is set */
/* XXX: This gets rid of many unpleasant artefacts! */
/* Example: the `c' in cour.pfa at size 13 */
if ( edge->serif && edge->link )
edge->serif = NULL;
}
}
Exit:
return error;
}
FT_LOCAL_DEF( FT_Error )
af_latin2_hints_detect_features( AF_GlyphHints hints,
AF_Dimension dim )
{
FT_Error error;
error = af_latin2_hints_compute_segments( hints, dim );
if ( !error )
{
af_latin2_hints_link_segments( hints, dim );
error = af_latin2_hints_compute_edges( hints, dim );
}
return error;
}
static void
af_latin2_hints_compute_blue_edges( AF_GlyphHints hints,
AF_LatinMetrics metrics )
{
AF_AxisHints axis = &hints->axis[AF_DIMENSION_VERT];
AF_Edge edge = axis->edges;
AF_Edge edge_limit = edge + axis->num_edges;
AF_LatinAxis latin = &metrics->axis[AF_DIMENSION_VERT];
FT_Fixed scale = latin->scale;
FT_Pos best_dist0; /* initial threshold */
/* compute the initial threshold as a fraction of the EM size */
best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale );
if ( best_dist0 > 64 / 2 )
best_dist0 = 64 / 2;
/* compute which blue zones are active, i.e. have their scaled */
/* size < 3/4 pixels */
/* for each horizontal edge search the blue zone which is closest */
for ( ; edge < edge_limit; edge++ )
{
FT_Int bb;
AF_Width best_blue = NULL;
FT_Pos best_dist = best_dist0;
for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ )
{
AF_LatinBlue blue = latin->blues + bb;
FT_Bool is_top_blue, is_major_dir;
/* skip inactive blue zones (i.e., those that are too small) */
if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ) )
continue;
/* if it is a top zone, check for right edges -- if it is a bottom */
/* zone, check for left edges */
/* */
/* of course, that's for TrueType */
is_top_blue = (FT_Byte)( ( blue->flags & AF_LATIN_BLUE_TOP ) != 0 );
is_major_dir = FT_BOOL( edge->dir == axis->major_dir );
/* if it is a top zone, the edge must be against the major */
/* direction; if it is a bottom zone, it must be in the major */
/* direction */
if ( is_top_blue ^ is_major_dir )
{
FT_Pos dist;
AF_Width compare;
/* if it's a rounded edge, compare it to the overshoot position */
/* if it's a flat edge, compare it to the reference position */
if ( edge->flags & AF_EDGE_ROUND )
compare = &blue->shoot;
else
compare = &blue->ref;
dist = edge->fpos - compare->org;
if ( dist < 0 )
dist = -dist;
dist = FT_MulFix( dist, scale );
if ( dist < best_dist )
{
best_dist = dist;
best_blue = compare;
}
#if 0
/* now, compare it to the overshoot position if the edge is */
/* rounded, and if the edge is over the reference position of a */
/* top zone, or under the reference position of a bottom zone */
if ( edge->flags & AF_EDGE_ROUND && dist != 0 )
{
FT_Bool is_under_ref = FT_BOOL( edge->fpos < blue->ref.org );
if ( is_top_blue ^ is_under_ref )
{
blue = latin->blues + bb;
dist = edge->fpos - blue->shoot.org;
if ( dist < 0 )
dist = -dist;
dist = FT_MulFix( dist, scale );
if ( dist < best_dist )
{
best_dist = dist;
best_blue = & blue->shoot;
}
}
}
#endif
}
}
if ( best_blue )
edge->blue_edge = best_blue;
}
}
static FT_Error
af_latin2_hints_init( AF_GlyphHints hints,
AF_LatinMetrics metrics )
{
FT_Render_Mode mode;
FT_UInt32 scaler_flags, other_flags;
FT_Face face = metrics->root.scaler.face;
af_glyph_hints_rescale( hints, (AF_StyleMetrics)metrics );
/*
* correct x_scale and y_scale if needed, since they may have
* been modified `af_latin2_metrics_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;
#if 0 /* #ifdef AF_CONFIG_OPTION_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 unless in `light' or `lcd' mode.
*/
if ( mode != FT_RENDER_MODE_LIGHT && mode != FT_RENDER_MODE_LCD )
other_flags |= AF_LATIN_HINTS_STEM_ADJUST;
if ( mode == FT_RENDER_MODE_MONO )
other_flags |= AF_LATIN_HINTS_MONO;
/*
* In `light' or `lcd' mode we disable horizontal hinting completely.
* We also do it if the face is italic.
*/
if ( mode == FT_RENDER_MODE_LIGHT || mode == FT_RENDER_MODE_LCD ||
( face->style_flags & FT_STYLE_FLAG_ITALIC ) != 0 )
scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL;
#ifdef AF_CONFIG_OPTION_USE_WARPER
/* get (global) warper flag */
if ( !metrics->root.globals->module->warping )
scaler_flags |= AF_SCALER_FLAG_NO_WARPER;
#endif
hints->scaler_flags = scaler_flags;
hints->other_flags = other_flags;
return 0;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** L A T I N G L Y P H G R I D - F I T T I N G *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* snap a given width in scaled coordinates to one of the */
/* current standard widths */
static FT_Pos
af_latin2_snap_width( AF_Width widths,
FT_UInt count,
FT_Pos width )
{
FT_UInt 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_latin2_compute_stem_width( AF_GlyphHints hints,
AF_Dimension dim,
FT_Pos width,
FT_UInt base_flags,
FT_UInt 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 );
if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ||
axis->extra_light )
return width;
if ( dist < 0 )
{
dist = -width;
sign = 1;
}
if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ||
( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) )
{
/* smooth hinting process: very lightly quantize the stem width */
/* leave the widths of serifs alone */
if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) )
goto Done_Width;
#if 0
else if ( ( base_flags & AF_EDGE_ROUND ) )
{
if ( dist < 80 )
dist = 64;
}
else if ( dist < 56 )
dist = 56;
#endif
if ( axis->width_count > 0 )
{
FT_Pos delta;
/* compare to standard width */
if ( axis->width_count > 0 )
{
delta = dist - axis->widths[0].cur;
if ( delta < 0 )
delta = -delta;
if ( delta < 40 )
{
dist = axis->widths[0].cur;
if ( dist < 48 )
dist = 48;
goto Done_Width;
}
}
if ( dist < 3 * 64 )
{
delta = dist & 63;
dist &= -64;
if ( delta < 10 )
dist += delta;
else if ( delta < 32 )
dist += 10;
else if ( delta < 54 )
dist += 54;
else
dist += delta;
}
else
dist = ( dist + 32 ) & ~63;
}
}
else
{
/* strong hinting process: snap the stem width to integer pixels */
FT_Pos org_dist = dist;
dist = af_latin2_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 )
{
/* We only round to an integer width if the corresponding */
/* distortion is less than 1/4 pixel. Otherwise this */
/* makes everything worse since the diagonals, which are */
/* not hinted, appear a lot bolder or thinner than the */
/* vertical stems. */
FT_Int delta;
dist = ( dist + 22 ) & ~63;
delta = dist - org_dist;
if ( delta < 0 )
delta = -delta;
if ( delta >= 16 )
{
dist = org_dist;
if ( dist < 48 )
dist = ( dist + 64 ) >> 1;
}
}
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_latin2_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_latin2_compute_stem_width( hints, dim, dist,
base_edge->flags,
stem_edge->flags );
stem_edge->pos = base_edge->pos + fitted_width;
FT_TRACE5(( "LINK: edge %d (opos=%.2f) linked to (%.2f), "
"dist was %.2f, now %.2f\n",
stem_edge-hints->axis[dim].edges, stem_edge->opos / 64.0,
stem_edge->pos / 64.0, dist / 64.0, fitted_width / 64.0 ));
}
static void
af_latin2_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 ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
static void
af_latin2_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;
AF_Edge edge;
AF_Edge anchor = NULL;
FT_Int has_serifs = 0;
FT_Pos anchor_drift = 0;
FT_TRACE5(( "==== hinting %s edges =====\n",
dim == AF_DIMENSION_HORZ ? "vertical" : "horizontal" ));
/* we begin by aligning all stems relative to the blue zone */
/* if needed -- that's only for horizontal edges */
if ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_BLUES( hints ) )
{
for ( edge = edges; edge < edge_limit; edge++ )
{
AF_Width blue;
AF_Edge edge1, edge2;
if ( edge->flags & AF_EDGE_DONE )
continue;
blue = edge->blue_edge;
edge1 = NULL;
edge2 = edge->link;
if ( blue )
{
edge1 = edge;
}
else if ( edge2 && edge2->blue_edge )
{
blue = edge2->blue_edge;
edge1 = edge2;
edge2 = edge;
}
if ( !edge1 )
continue;
FT_TRACE5(( "BLUE: edge %d (opos=%.2f) snapped to (%.2f), "
"was (%.2f)\n",
edge1-edges, edge1->opos / 64.0, blue->fit / 64.0,
edge1->pos / 64.0 ));
edge1->pos = blue->fit;
edge1->flags |= AF_EDGE_DONE;
if ( edge2 && !edge2->blue_edge )
{
af_latin2_align_linked_edge( hints, dim, edge1, edge2 );
edge2->flags |= AF_EDGE_DONE;
}
if ( !anchor )
{
anchor = edge;
anchor_drift = ( anchor->pos - anchor->opos );
if ( edge2 )
anchor_drift = ( anchor_drift +
( edge2->pos - edge2->opos ) ) >> 1;
}
}
}
/* now we will align all stem edges, trying to maintain the */
/* relative order of stems in the glyph */
for ( edge = edges; edge < edge_limit; edge++ )
{
AF_Edge edge2;
if ( edge->flags & AF_EDGE_DONE )
continue;
/* skip all non-stem edges */
edge2 = edge->link;
if ( !edge2 )
{
has_serifs++;
continue;
}
/* now align the stem */
/* this should not happen, but it's better to be safe */
if ( edge2->blue_edge )
{
FT_TRACE5(( "ASSERTION FAILED for edge %d\n", edge2-edges ));
af_latin2_align_linked_edge( hints, dim, edge2, edge );
edge->flags |= AF_EDGE_DONE;
continue;
}
if ( !anchor )
{
FT_Pos org_len, org_center, cur_len;
FT_Pos cur_pos1, error1, error2, u_off, d_off;
org_len = edge2->opos - edge->opos;
cur_len = af_latin2_compute_stem_width( hints, dim, org_len,
edge->flags,
edge2->flags );
if ( cur_len <= 64 )
u_off = d_off = 32;
else
{
u_off = 38;
d_off = 26;
}
if ( cur_len < 96 )
{
org_center = edge->opos + ( org_len >> 1 );
cur_pos1 = FT_PIX_ROUND( org_center );
error1 = org_center - ( cur_pos1 - u_off );
if ( error1 < 0 )
error1 = -error1;
error2 = org_center - ( cur_pos1 + d_off );
if ( error2 < 0 )
error2 = -error2;
if ( error1 < error2 )
cur_pos1 -= u_off;
else
cur_pos1 += d_off;
edge->pos = cur_pos1 - cur_len / 2;
edge2->pos = edge->pos + cur_len;
}
else
edge->pos = FT_PIX_ROUND( edge->opos );
FT_TRACE5(( "ANCHOR: edge %d (opos=%.2f) and %d (opos=%.2f)"
" snapped to (%.2f) (%.2f)\n",
edge-edges, edge->opos / 64.0,
edge2-edges, edge2->opos / 64.0,
edge->pos / 64.0, edge2->pos / 64.0 ));
anchor = edge;
edge->flags |= AF_EDGE_DONE;
af_latin2_align_linked_edge( hints, dim, edge, edge2 );
edge2->flags |= AF_EDGE_DONE;
anchor_drift = ( ( anchor->pos - anchor->opos ) +
( edge2->pos - edge2->opos ) ) >> 1;
FT_TRACE5(( "DRIFT: %.2f\n", anchor_drift/64.0 ));
}
else
{
FT_Pos org_pos, org_len, org_center, cur_center, cur_len;
FT_Pos org_left, org_right;
org_pos = edge->opos + anchor_drift;
org_len = edge2->opos - edge->opos;
org_center = org_pos + ( org_len >> 1 );
cur_len = af_latin2_compute_stem_width( hints, dim, org_len,
edge->flags,
edge2->flags );
org_left = org_pos + ( ( org_len - cur_len ) >> 1 );
org_right = org_pos + ( ( org_len + cur_len ) >> 1 );
FT_TRACE5(( "ALIGN: left=%.2f right=%.2f ",
org_left / 64.0, org_right / 64.0 ));
cur_center = org_center;
if ( edge2->flags & AF_EDGE_DONE )
{
FT_TRACE5(( "\n" ));
edge->pos = edge2->pos - cur_len;
}
else
{
/* we want to compare several displacement, and choose
* the one that increases fitness while minimizing
* distortion as well
*/
FT_Pos displacements[6], scores[6], org, fit, delta;
FT_UInt count = 0;
/* note: don't even try to fit tiny stems */
if ( cur_len < 32 )
{
FT_TRACE5(( "tiny stem\n" ));
goto AlignStem;
}
/* if the span is within a single pixel, don't touch it */
if ( FT_PIX_FLOOR( org_left ) == FT_PIX_CEIL( org_right ) )
{
FT_TRACE5(( "single pixel stem\n" ));
goto AlignStem;
}
if ( cur_len <= 96 )
{
/* we want to avoid the absolute worst case which is
* when the left and right edges of the span each represent
* about 50% of the gray. we'd better want to change this
* to 25/75%, since this is much more pleasant to the eye with
* very acceptable distortion
*/
FT_Pos frac_left = org_left & 63;
FT_Pos frac_right = org_right & 63;
if ( frac_left >= 22 && frac_left <= 42 &&
frac_right >= 22 && frac_right <= 42 )
{
org = frac_left;
fit = ( org <= 32 ) ? 16 : 48;
delta = FT_ABS( fit - org );
displacements[count] = fit - org;
scores[count++] = delta;
FT_TRACE5(( "dispA=%.2f (%d) ", ( fit - org ) / 64.0, delta ));
org = frac_right;
fit = ( org <= 32 ) ? 16 : 48;
delta = FT_ABS( fit - org );
displacements[count] = fit - org;
scores[count++] = delta;
FT_TRACE5(( "dispB=%.2f (%d) ", ( fit - org ) / 64.0, delta ));
}
}
/* snapping the left edge to the grid */
org = org_left;
fit = FT_PIX_ROUND( org );
delta = FT_ABS( fit - org );
displacements[count] = fit - org;
scores[count++] = delta;
FT_TRACE5(( "dispC=%.2f (%d) ", ( fit - org ) / 64.0, delta ));
/* snapping the right edge to the grid */
org = org_right;
fit = FT_PIX_ROUND( org );
delta = FT_ABS( fit - org );
displacements[count] = fit - org;
scores[count++] = delta;
FT_TRACE5(( "dispD=%.2f (%d) ", ( fit - org ) / 64.0, delta ));
/* now find the best displacement */
{
FT_Pos best_score = scores[0];
FT_Pos best_disp = displacements[0];
FT_UInt nn;
for ( nn = 1; nn < count; nn++ )
{
if ( scores[nn] < best_score )
{
best_score = scores[nn];
best_disp = displacements[nn];
}
}
cur_center = org_center + best_disp;
}
FT_TRACE5(( "\n" ));
}
AlignStem:
edge->pos = cur_center - ( cur_len >> 1 );
edge2->pos = edge->pos + cur_len;
FT_TRACE5(( "STEM1: %d (opos=%.2f) to %d (opos=%.2f)"
" snapped to (%.2f) and (%.2f),"
" org_len=%.2f cur_len=%.2f\n",
edge-edges, edge->opos / 64.0,
edge2-edges, edge2->opos / 64.0,
edge->pos / 64.0, edge2->pos / 64.0,
org_len / 64.0, cur_len / 64.0 ));
edge->flags |= AF_EDGE_DONE;
edge2->flags |= AF_EDGE_DONE;
if ( edge > edges && edge->pos < edge[-1].pos )
{
FT_TRACE5(( "BOUND: %d (pos=%.2f) to (%.2f)\n",
edge-edges, edge->pos / 64.0, edge[-1].pos / 64.0 ));
edge->pos = edge[-1].pos;
}
}
}
/* make sure that lowercase m's maintain their symmetry */
/* In general, lowercase m's have six vertical edges if they are sans */
/* serif, or twelve if they are 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. */
#if 0
{
FT_Int n_edges = edge_limit - edges;
if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )
{
AF_Edge edge1, edge2, edge3;
FT_Pos dist1, dist2, span, delta;
if ( n_edges == 6 )
{
edge1 = edges;
edge2 = edges + 2;
edge3 = edges + 4;
}
else
{
edge1 = edges + 1;
edge2 = edges + 5;
edge3 = edges + 9;
}
dist1 = edge2->opos - edge1->opos;
dist2 = edge3->opos - edge2->opos;
span = dist1 - dist2;
if ( span < 0 )
span = -span;
if ( span < 8 )
{
delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );
edge3->pos -= delta;
if ( edge3->link )
edge3->link->pos -= delta;
/* move the serifs along with the stem */
if ( n_edges == 12 )
{
( edges + 8 )->pos -= delta;
( edges + 11 )->pos -= delta;
}
edge3->flags |= AF_EDGE_DONE;
if ( edge3->link )
edge3->link->flags |= AF_EDGE_DONE;
}
}
}
#endif
if ( has_serifs || !anchor )
{
/*
* now hint the remaining edges (serifs and single) in order
* to complete our processing
*/
for ( edge = edges; edge < edge_limit; edge++ )
{
FT_Pos delta;
if ( edge->flags & AF_EDGE_DONE )
continue;
delta = 1000;
if ( edge->serif )
{
delta = edge->serif->opos - edge->opos;
if ( delta < 0 )
delta = -delta;
}
if ( delta < 64 + 16 )
{
af_latin2_align_serif_edge( hints, edge->serif, edge );
FT_TRACE5(( "SERIF: edge %d (opos=%.2f) serif to %d (opos=%.2f)"
" aligned to (%.2f)\n",
edge-edges, edge->opos / 64.0,
edge->serif - edges, edge->serif->opos / 64.0,
edge->pos / 64.0 ));
}
else if ( !anchor )
{
FT_TRACE5(( "SERIF_ANCHOR: edge %d (opos=%.2f)"
" snapped to (%.2f)\n",
edge-edges, edge->opos / 64.0, edge->pos / 64.0 ));
edge->pos = FT_PIX_ROUND( edge->opos );
anchor = edge;
}
else
{
AF_Edge before, after;
for ( before = edge - 1; before >= edges; before-- )
if ( before->flags & AF_EDGE_DONE )
break;
for ( after = edge + 1; after < edge_limit; after++ )
if ( after->flags & AF_EDGE_DONE )
break;
if ( before >= edges && before < edge &&
after < edge_limit && after > edge )
{
if ( after->opos == before->opos )
edge->pos = before->pos;
else
edge->pos = before->pos +
FT_MulDiv( edge->opos - before->opos,
after->pos - before->pos,
after->opos - before->opos );
FT_TRACE5(( "SERIF_LINK1: edge %d (opos=%.2f) snapped to (%.2f)"
" from %d (opos=%.2f)\n",
edge-edges, edge->opos / 64.0, edge->pos / 64.0,
before - edges, before->opos / 64.0 ));
}
else
{
edge->pos = anchor->pos +
( ( edge->opos - anchor->opos + 16 ) & ~31 );
FT_TRACE5(( "SERIF_LINK2: edge %d (opos=%.2f)"
" snapped to (%.2f)\n",
edge-edges, edge->opos / 64.0, edge->pos / 64.0 ));
}
}
edge->flags |= AF_EDGE_DONE;
if ( edge > edges && edge->pos < edge[-1].pos )
edge->pos = edge[-1].pos;
if ( edge + 1 < edge_limit &&
edge[1].flags & AF_EDGE_DONE &&
edge->pos > edge[1].pos )
edge->pos = edge[1].pos;
}
}
}
static FT_Error
af_latin2_hints_apply( FT_UInt glyph_index,
AF_GlyphHints hints,
FT_Outline* outline,
AF_LatinMetrics metrics )
{
FT_Error error;
int dim;
FT_UNUSED( glyph_index );
error = af_glyph_hints_reload( hints, outline );
if ( error )
goto Exit;
/* analyze glyph outline */
if ( AF_HINTS_DO_HORIZONTAL( hints ) )
{
error = af_latin2_hints_detect_features( hints, AF_DIMENSION_HORZ );
if ( error )
goto Exit;
}
if ( AF_HINTS_DO_VERTICAL( hints ) )
{
error = af_latin2_hints_detect_features( hints, AF_DIMENSION_VERT );
if ( error )
goto Exit;
af_latin2_hints_compute_blue_edges( hints, metrics );
}
/* grid-fit the outline */
for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
{
#ifdef AF_CONFIG_OPTION_USE_WARPER
if ( dim == AF_DIMENSION_HORZ &&
metrics->root.scaler.render_mode == FT_RENDER_MODE_NORMAL &&
AF_HINTS_DO_WARP( hints ) )
{
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_CONFIG_OPTION_USE_WARPER */
if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||
( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) )
{
af_latin2_hint_edges( hints, (AF_Dimension)dim );
af_glyph_hints_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 );
}
}
af_glyph_hints_save( hints, outline );
Exit:
return error;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** L A T I N S C R I P T C L A S S *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
AF_DEFINE_WRITING_SYSTEM_CLASS(
af_latin2_writing_system_class,
AF_WRITING_SYSTEM_LATIN2,
sizeof ( AF_LatinMetricsRec ),
(AF_WritingSystem_InitMetricsFunc) af_latin2_metrics_init, /* style_metrics_init */
(AF_WritingSystem_ScaleMetricsFunc)af_latin2_metrics_scale, /* style_metrics_scale */
(AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */
(AF_WritingSystem_GetStdWidthsFunc)af_latin2_get_standard_widths, /* style_metrics_getstdw */
(AF_WritingSystem_InitHintsFunc) af_latin2_hints_init, /* style_hints_init */
(AF_WritingSystem_ApplyHintsFunc) af_latin2_hints_apply /* style_hints_apply */
)
#else /* !FT_OPTION_AUTOFIT2 */
/* ANSI C doesn't like empty source files */
typedef int _af_latin2_dummy;
#endif /* !FT_OPTION_AUTOFIT2 */
/* END */