ref: e12ed563d600299fc7e009311ed412be6fde4188
dir: /src/autofit/afhints.c/
/***************************************************************************/
/* */
/* afhints.c */
/* */
/* Auto-fitter hinting routines (body). */
/* */
/* Copyright 2003, 2004, 2005, 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. */
/* */
/***************************************************************************/
#include "afhints.h"
#include "aferrors.h"
#include FT_INTERNAL_CALC_H
FT_LOCAL_DEF( FT_Error )
af_axis_hints_new_segment( AF_AxisHints axis,
FT_Memory memory,
AF_Segment *asegment )
{
FT_Error error = AF_Err_Ok;
AF_Segment segment = NULL;
if ( axis->num_segments >= axis->max_segments )
{
FT_Int old_max = axis->max_segments;
FT_Int new_max = old_max;
FT_Int big_max = FT_INT_MAX / sizeof ( *segment );
if ( old_max >= big_max )
{
error = AF_Err_Out_Of_Memory;
goto Exit;
}
new_max += ( new_max >> 2 ) + 4;
if ( new_max < old_max || new_max > big_max )
new_max = big_max;
if ( FT_RENEW_ARRAY( axis->segments, old_max, new_max ) )
goto Exit;
axis->max_segments = new_max;
}
segment = axis->segments + axis->num_segments++;
Exit:
*asegment = segment;
return error;
}
FT_LOCAL( FT_Error )
af_axis_hints_new_edge( AF_AxisHints axis,
FT_Int fpos,
AF_Direction dir,
FT_Memory memory,
AF_Edge *aedge )
{
FT_Error error = AF_Err_Ok;
AF_Edge edge = NULL;
AF_Edge edges;
if ( axis->num_edges >= axis->max_edges )
{
FT_Int old_max = axis->max_edges;
FT_Int new_max = old_max;
FT_Int big_max = FT_INT_MAX / sizeof ( *edge );
if ( old_max >= big_max )
{
error = AF_Err_Out_Of_Memory;
goto Exit;
}
new_max += ( new_max >> 2 ) + 4;
if ( new_max < old_max || new_max > big_max )
new_max = big_max;
if ( FT_RENEW_ARRAY( axis->edges, old_max, new_max ) )
goto Exit;
axis->max_edges = new_max;
}
edges = axis->edges;
edge = edges + axis->num_edges;
while ( edge > edges )
{
if ( edge[-1].fpos < fpos )
break;
/* we want the edge with same position and minor direction */
/* to appear before those in the major one in the list */
if ( edge[-1].fpos == fpos && dir == axis->major_dir )
break;
edge[0] = edge[-1];
edge--;
}
axis->num_edges++;
FT_ZERO( edge );
edge->fpos = (FT_Short)fpos;
edge->dir = (FT_Char)dir;
Exit:
*aedge = edge;
return error;
}
#ifdef AF_DEBUG
#include <stdio.h>
static const char*
af_dir_str( AF_Direction dir )
{
const char* result;
switch ( dir )
{
case AF_DIR_UP:
result = "up";
break;
case AF_DIR_DOWN:
result = "down";
break;
case AF_DIR_LEFT:
result = "left";
break;
case AF_DIR_RIGHT:
result = "right";
break;
default:
result = "none";
}
return result;
}
#define AF_INDEX_NUM( ptr, base ) ( (ptr) ? ( (ptr) - (base) ) : -1 )
void
af_glyph_hints_dump_points( AF_GlyphHints hints )
{
AF_Point points = hints->points;
AF_Point limit = points + hints->num_points;
AF_Point point;
printf( "Table of points:\n" );
printf( " [ index | xorg | yorg | xscale | yscale "
"| xfit | yfit | flags ]\n" );
for ( point = points; point < limit; point++ )
{
printf( " [ %5d | %5d | %5d | %-5.2f | %-5.2f "
"| %-5.2f | %-5.2f | %c%c%c%c%c%c ]\n",
point - points,
point->fx,
point->fy,
point->ox/64.0,
point->oy/64.0,
point->x/64.0,
point->y/64.0,
( point->flags & AF_FLAG_WEAK_INTERPOLATION ) ? 'w' : ' ',
( point->flags & AF_FLAG_INFLECTION ) ? 'i' : ' ',
( point->flags & AF_FLAG_EXTREMA_X ) ? '<' : ' ',
( point->flags & AF_FLAG_EXTREMA_Y ) ? 'v' : ' ',
( point->flags & AF_FLAG_ROUND_X ) ? '(' : ' ',
( point->flags & AF_FLAG_ROUND_Y ) ? 'u' : ' ');
}
printf( "\n" );
}
static const char*
af_edge_flags_to_string( AF_Edge_Flags flags )
{
static char temp[32];
int pos = 0;
if ( flags & AF_EDGE_ROUND )
{
memcpy( temp + pos, "round", 5 );
pos += 5;
}
if ( flags & AF_EDGE_SERIF )
{
if ( pos > 0 )
temp[pos++] = ' ';
memcpy( temp + pos, "serif", 5 );
pos += 5;
}
if ( pos == 0 )
return "normal";
temp[pos] = 0;
return temp;
}
/* A function to dump the array of linked segments. */
void
af_glyph_hints_dump_segments( AF_GlyphHints hints )
{
FT_Int dimension;
for ( dimension = 1; dimension >= 0; dimension-- )
{
AF_AxisHints axis = &hints->axis[dimension];
AF_Segment segments = axis->segments;
AF_Segment limit = segments + axis->num_segments;
AF_Segment seg;
printf ( "Table of %s segments:\n",
dimension == AF_DIMENSION_HORZ ? "vertical" : "horizontal" );
printf ( " [ index | pos | dir | link | serif |"
" height | extra | flags ]\n" );
for ( seg = segments; seg < limit; seg++ )
{
printf ( " [ %5d | %5.2g | %5s | %4d | %5d | %5d | %5d | %s ]\n",
seg - segments,
dimension == AF_DIMENSION_HORZ ? (int)seg->first->ox / 64.0
: (int)seg->first->oy / 64.0,
af_dir_str( (AF_Direction)seg->dir ),
AF_INDEX_NUM( seg->link, segments ),
AF_INDEX_NUM( seg->serif, segments ),
seg->height,
seg->height - ( seg->max_coord - seg->min_coord ),
af_edge_flags_to_string( seg->flags ) );
}
printf( "\n" );
}
}
void
af_glyph_hints_dump_edges( AF_GlyphHints hints )
{
FT_Int dimension;
for ( dimension = 1; dimension >= 0; dimension-- )
{
AF_AxisHints axis = &hints->axis[dimension];
AF_Edge edges = axis->edges;
AF_Edge limit = edges + axis->num_edges;
AF_Edge edge;
/*
* note: AF_DIMENSION_HORZ corresponds to _vertical_ edges
* since they have constant a X coordinate.
*/
printf ( "Table of %s edges:\n",
dimension == AF_DIMENSION_HORZ ? "vertical" : "horizontal" );
printf ( " [ index | pos | dir | link |"
" serif | blue | opos | pos | flags ]\n" );
for ( edge = edges; edge < limit; edge++ )
{
printf ( " [ %5d | %5.2g | %5s | %4d |"
" %5d | %c | %5.2f | %5.2f | %s ]\n",
edge - edges,
(int)edge->opos / 64.0,
af_dir_str( (AF_Direction)edge->dir ),
AF_INDEX_NUM( edge->link, edges ),
AF_INDEX_NUM( edge->serif, edges ),
edge->blue_edge ? 'y' : 'n',
edge->opos / 64.0,
edge->pos / 64.0,
af_edge_flags_to_string( edge->flags ) );
}
printf( "\n" );
}
}
#else /* !AF_DEBUG */
/* these empty stubs are only used to link the `ftgrid' test program */
/* when debugging is disabled */
void
af_glyph_hints_dump_points( AF_GlyphHints hints )
{
FT_UNUSED( hints );
}
void
af_glyph_hints_dump_segments( AF_GlyphHints hints )
{
FT_UNUSED( hints );
}
void
af_glyph_hints_dump_edges( AF_GlyphHints hints )
{
FT_UNUSED( hints );
}
#endif /* !AF_DEBUG */
/* compute the direction value of a given vector */
FT_LOCAL_DEF( AF_Direction )
af_direction_compute( FT_Pos dx,
FT_Pos dy )
{
FT_Pos ll, ss; /* long and short arm lengths */
AF_Direction dir; /* candidate direction */
if ( dy >= dx )
{
if ( dy >= -dx )
{
dir = AF_DIR_UP;
ll = dy;
ss = dx;
}
else
{
dir = AF_DIR_LEFT;
ll = -dx;
ss = dy;
}
}
else /* dy < dx */
{
if ( dy >= -dx )
{
dir = AF_DIR_RIGHT;
ll = dx;
ss = dy;
}
else
{
dir = AF_DIR_DOWN;
ll = dy;
ss = dx;
}
}
ss *= 14;
if ( FT_ABS( ll ) <= FT_ABS( ss ) )
dir = AF_DIR_NONE;
return dir;
}
/* compute all inflex points in a given glyph */
static void
af_glyph_hints_compute_inflections( AF_GlyphHints hints )
{
AF_Point* contour = hints->contours;
AF_Point* contour_limit = contour + hints->num_contours;
/* do each contour separately */
for ( ; contour < contour_limit; contour++ )
{
AF_Point point = contour[0];
AF_Point first = point;
AF_Point start = point;
AF_Point end = point;
AF_Point before;
AF_Point after;
FT_Pos in_x, in_y, out_x, out_y;
AF_Angle orient_prev, orient_cur;
FT_Int finished = 0;
/* compute first segment in contour */
first = point;
start = end = first;
do
{
end = end->next;
if ( end == first )
goto Skip;
in_x = end->fx - start->fx;
in_y = end->fy - start->fy;
} while ( in_x == 0 && in_y == 0 );
/* extend the segment start whenever possible */
before = start;
do
{
do
{
start = before;
before = before->prev;
if ( before == first )
goto Skip;
out_x = start->fx - before->fx;
out_y = start->fy - before->fy;
} while ( out_x == 0 && out_y == 0 );
orient_prev = ft_corner_orientation( in_x, in_y, out_x, out_y );
} while ( orient_prev == 0 );
first = start;
in_x = out_x;
in_y = out_y;
/* now process all segments in the contour */
do
{
/* first, extend current segment's end whenever possible */
after = end;
do
{
do
{
end = after;
after = after->next;
if ( after == first )
finished = 1;
out_x = after->fx - end->fx;
out_y = after->fy - end->fy;
} while ( out_x == 0 && out_y == 0 );
orient_cur = ft_corner_orientation( in_x, in_y, out_x, out_y );
} while ( orient_cur == 0 );
if ( ( orient_prev + orient_cur ) == 0 )
{
/* we have an inflection point here */
do
{
start->flags |= AF_FLAG_INFLECTION;
start = start->next;
} while ( start != end );
start->flags |= AF_FLAG_INFLECTION;
}
start = end;
end = after;
orient_prev = orient_cur;
in_x = out_x;
in_y = out_y;
} while ( !finished );
Skip:
;
}
}
FT_LOCAL_DEF( void )
af_glyph_hints_init( AF_GlyphHints hints,
FT_Memory memory )
{
FT_ZERO( hints );
hints->memory = memory;
}
FT_LOCAL_DEF( void )
af_glyph_hints_done( AF_GlyphHints hints )
{
if ( hints && hints->memory )
{
FT_Memory memory = hints->memory;
int dim;
/*
* note that we don't need to free the segment and edge
* buffers, since they are really within the hints->points array
*/
for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
{
AF_AxisHints axis = &hints->axis[dim];
axis->num_segments = 0;
axis->max_segments = 0;
FT_FREE( axis->segments );
axis->num_edges = 0;
axis->max_edges = 0;
FT_FREE( axis->edges );
}
FT_FREE( hints->contours );
hints->max_contours = 0;
hints->num_contours = 0;
FT_FREE( hints->points );
hints->num_points = 0;
hints->max_points = 0;
hints->memory = NULL;
}
}
FT_LOCAL_DEF( void )
af_glyph_hints_rescale( AF_GlyphHints hints,
AF_ScriptMetrics metrics )
{
hints->metrics = metrics;
hints->scaler_flags = metrics->scaler.flags;
}
FT_LOCAL_DEF( FT_Error )
af_glyph_hints_reload( AF_GlyphHints hints,
FT_Outline* outline,
FT_Bool get_inflections )
{
FT_Error error = AF_Err_Ok;
AF_Point points;
FT_UInt old_max, new_max;
FT_Fixed x_scale = hints->x_scale;
FT_Fixed y_scale = hints->y_scale;
FT_Pos x_delta = hints->x_delta;
FT_Pos y_delta = hints->y_delta;
FT_Memory memory = hints->memory;
hints->num_points = 0;
hints->num_contours = 0;
hints->axis[0].num_segments = 0;
hints->axis[0].num_edges = 0;
hints->axis[1].num_segments = 0;
hints->axis[1].num_edges = 0;
/* first of all, reallocate the contours array when necessary */
new_max = (FT_UInt)outline->n_contours;
old_max = hints->max_contours;
if ( new_max > old_max )
{
new_max = ( new_max + 3 ) & ~3;
if ( FT_RENEW_ARRAY( hints->contours, old_max, new_max ) )
goto Exit;
hints->max_contours = new_max;
}
/*
* then reallocate the points arrays if necessary --
* note that we reserve two additional point positions, used to
* hint metrics appropriately
*/
new_max = (FT_UInt)( outline->n_points + 2 );
old_max = hints->max_points;
if ( new_max > old_max )
{
new_max = ( new_max + 2 + 7 ) & ~7;
if ( FT_RENEW_ARRAY( hints->points, old_max, new_max ) )
goto Exit;
hints->max_points = new_max;
}
hints->num_points = outline->n_points;
hints->num_contours = outline->n_contours;
/* We can't rely on the value of `FT_Outline.flags' to know the fill */
/* direction used for a glyph, given that some fonts are broken (e.g., */
/* the Arphic ones). We thus recompute it each time we need to. */
/* */
hints->axis[AF_DIMENSION_HORZ].major_dir = AF_DIR_UP;
hints->axis[AF_DIMENSION_VERT].major_dir = AF_DIR_LEFT;
if ( FT_Outline_Get_Orientation( outline ) == FT_ORIENTATION_POSTSCRIPT )
{
hints->axis[AF_DIMENSION_HORZ].major_dir = AF_DIR_DOWN;
hints->axis[AF_DIMENSION_VERT].major_dir = AF_DIR_RIGHT;
}
hints->x_scale = x_scale;
hints->y_scale = y_scale;
hints->x_delta = x_delta;
hints->y_delta = y_delta;
hints->xmin_delta = 0;
hints->xmax_delta = 0;
points = hints->points;
if ( hints->num_points == 0 )
goto Exit;
{
AF_Point point;
AF_Point point_limit = points + hints->num_points;
/* compute coordinates & Bezier flags, next and prev */
{
FT_Vector* vec = outline->points;
char* tag = outline->tags;
AF_Point first = points;
AF_Point end = points + outline->contours[0];
AF_Point prev = end;
FT_Int contour_index = 0;
for ( point = points; point < point_limit; point++, vec++, tag++ )
{
point->fx = (FT_Short)vec->x;
point->fy = (FT_Short)vec->y;
point->ox = point->x = FT_MulFix( vec->x, x_scale ) + x_delta;
point->oy = point->y = FT_MulFix( vec->y, y_scale ) + y_delta;
switch ( FT_CURVE_TAG( *tag ) )
{
case FT_CURVE_TAG_CONIC:
point->flags = AF_FLAG_CONIC;
break;
case FT_CURVE_TAG_CUBIC:
point->flags = AF_FLAG_CUBIC;
break;
default:
point->flags = 0;
}
point->prev = prev;
prev->next = point;
prev = point;
if ( point == end )
{
if ( ++contour_index < outline->n_contours )
{
first = point + 1;
end = points + outline->contours[contour_index];
prev = end;
}
}
}
}
/* set-up the contours array */
{
AF_Point* contour = hints->contours;
AF_Point* contour_limit = contour + hints->num_contours;
short* end = outline->contours;
short idx = 0;
for ( ; contour < contour_limit; contour++, end++ )
{
contour[0] = points + idx;
idx = (short)( end[0] + 1 );
}
}
/* compute directions of in & out vectors */
{
AF_Point first = points;
AF_Point prev = NULL;
FT_Pos in_x = 0;
FT_Pos in_y = 0;
AF_Direction in_dir = AF_DIR_NONE;
for ( point = points; point < point_limit; point++ )
{
AF_Point next;
FT_Pos out_x, out_y;
if ( point == first )
{
prev = first->prev;
in_x = first->fx - prev->fx;
in_y = first->fy - prev->fy;
in_dir = af_direction_compute( in_x, in_y );
first = prev + 1;
}
point->in_dir = (FT_Char)in_dir;
next = point->next;
out_x = next->fx - point->fx;
out_y = next->fy - point->fy;
in_dir = af_direction_compute( out_x, out_y );
point->out_dir = (FT_Char)in_dir;
if ( point->flags & ( AF_FLAG_CONIC | AF_FLAG_CUBIC ) )
{
Is_Weak_Point:
point->flags |= AF_FLAG_WEAK_INTERPOLATION;
}
else if ( point->out_dir == point->in_dir )
{
if ( point->out_dir != AF_DIR_NONE )
goto Is_Weak_Point;
if ( ft_corner_is_flat( in_x, in_y, out_x, out_y ) )
goto Is_Weak_Point;
}
else if ( point->in_dir == -point->out_dir )
goto Is_Weak_Point;
in_x = out_x;
in_y = out_y;
prev = point;
}
}
}
/* compute inflection points -- */
/* disabled due to no longer perceived benefits */
if ( 0 && get_inflections )
af_glyph_hints_compute_inflections( hints );
Exit:
return error;
}
FT_LOCAL_DEF( void )
af_glyph_hints_save( AF_GlyphHints hints,
FT_Outline* outline )
{
AF_Point point = hints->points;
AF_Point limit = point + hints->num_points;
FT_Vector* vec = outline->points;
char* tag = outline->tags;
for ( ; point < limit; point++, vec++, tag++ )
{
vec->x = point->x;
vec->y = point->y;
if ( point->flags & AF_FLAG_CONIC )
tag[0] = FT_CURVE_TAG_CONIC;
else if ( point->flags & AF_FLAG_CUBIC )
tag[0] = FT_CURVE_TAG_CUBIC;
else
tag[0] = FT_CURVE_TAG_ON;
}
}
/****************************************************************
*
* EDGE POINT GRID-FITTING
*
****************************************************************/
FT_LOCAL_DEF( void )
af_glyph_hints_align_edge_points( 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_Segment seg;
if ( dim == AF_DIMENSION_HORZ )
{
for ( seg = segments; seg < segment_limit; seg++ )
{
AF_Edge edge = seg->edge;
AF_Point point, first, last;
if ( edge == NULL )
continue;
first = seg->first;
last = seg->last;
point = first;
for (;;)
{
point->x = edge->pos;
point->flags |= AF_FLAG_TOUCH_X;
if ( point == last )
break;
point = point->next;
}
}
}
else
{
for ( seg = segments; seg < segment_limit; seg++ )
{
AF_Edge edge = seg->edge;
AF_Point point, first, last;
if ( edge == NULL )
continue;
first = seg->first;
last = seg->last;
point = first;
for (;;)
{
point->y = edge->pos;
point->flags |= AF_FLAG_TOUCH_Y;
if ( point == last )
break;
point = point->next;
}
}
}
}
/****************************************************************
*
* STRONG POINT INTERPOLATION
*
****************************************************************/
/* hint the strong points -- this is equivalent to the TrueType `IP' */
/* hinting instruction */
FT_LOCAL_DEF( void )
af_glyph_hints_align_strong_points( AF_GlyphHints hints,
AF_Dimension dim )
{
AF_Point points = hints->points;
AF_Point point_limit = points + hints->num_points;
AF_AxisHints axis = &hints->axis[dim];
AF_Edge edges = axis->edges;
AF_Edge edge_limit = edges + axis->num_edges;
AF_Flags touch_flag;
if ( dim == AF_DIMENSION_HORZ )
touch_flag = AF_FLAG_TOUCH_X;
else
touch_flag = AF_FLAG_TOUCH_Y;
if ( edges < edge_limit )
{
AF_Point point;
AF_Edge edge;
for ( point = points; point < point_limit; point++ )
{
FT_Pos u, ou, fu; /* point position */
FT_Pos delta;
if ( point->flags & touch_flag )
continue;
/* if this point is candidate to weak interpolation, we */
/* interpolate it after all strong points have been processed */
if ( ( point->flags & AF_FLAG_WEAK_INTERPOLATION ) &&
!( point->flags & AF_FLAG_INFLECTION ) )
continue;
if ( dim == AF_DIMENSION_VERT )
{
u = point->fy;
ou = point->oy;
}
else
{
u = point->fx;
ou = point->ox;
}
fu = u;
/* is the point before the first edge? */
edge = edges;
delta = edge->fpos - u;
if ( delta >= 0 )
{
u = edge->pos - ( edge->opos - ou );
goto Store_Point;
}
/* is the point after the last edge? */
edge = edge_limit - 1;
delta = u - edge->fpos;
if ( delta >= 0 )
{
u = edge->pos + ( ou - edge->opos );
goto Store_Point;
}
{
FT_UInt min, max, mid;
FT_Pos fpos;
/* find enclosing edges */
min = 0;
max = edge_limit - edges;
#if 1
/* for small edge counts, a linear search is better */
if ( max <= 8 )
{
FT_UInt nn;
for ( nn = 0; nn < max; nn++ )
if ( edges[nn].fpos >= u )
break;
if ( edges[nn].fpos == u )
{
u = edges[nn].pos;
goto Store_Point;
}
min = nn;
}
else
#endif
while ( min < max )
{
mid = ( max + min ) >> 1;
edge = edges + mid;
fpos = edge->fpos;
if ( u < fpos )
max = mid;
else if ( u > fpos )
min = mid + 1;
else
{
/* we are on the edge */
u = edge->pos;
goto Store_Point;
}
}
{
AF_Edge before = edges + min - 1;
AF_Edge after = edges + min + 0;
/* assert( before && after && before != after ) */
if ( before->scale == 0 )
before->scale = FT_DivFix( after->pos - before->pos,
after->fpos - before->fpos );
u = before->pos + FT_MulFix( fu - before->fpos,
before->scale );
}
}
Store_Point:
/* save the point position */
if ( dim == AF_DIMENSION_HORZ )
point->x = u;
else
point->y = u;
point->flags |= touch_flag;
}
}
}
/****************************************************************
*
* WEAK POINT INTERPOLATION
*
****************************************************************/
static void
af_iup_shift( AF_Point p1,
AF_Point p2,
AF_Point ref )
{
AF_Point p;
FT_Pos delta = ref->u - ref->v;
if ( delta == 0 )
return;
for ( p = p1; p < ref; p++ )
p->u = p->v + delta;
for ( p = ref + 1; p <= p2; p++ )
p->u = p->v + delta;
}
static void
af_iup_interp( AF_Point p1,
AF_Point p2,
AF_Point ref1,
AF_Point ref2 )
{
AF_Point p;
FT_Pos u;
FT_Pos v1 = ref1->v;
FT_Pos v2 = ref2->v;
FT_Pos d1 = ref1->u - v1;
FT_Pos d2 = ref2->u - v2;
if ( p1 > p2 )
return;
if ( v1 == v2 )
{
for ( p = p1; p <= p2; p++ )
{
u = p->v;
if ( u <= v1 )
u += d1;
else
u += d2;
p->u = u;
}
return;
}
if ( v1 < v2 )
{
for ( p = p1; p <= p2; p++ )
{
u = p->v;
if ( u <= v1 )
u += d1;
else if ( u >= v2 )
u += d2;
else
u = ref1->u + FT_MulDiv( u - v1, ref2->u - ref1->u, v2 - v1 );
p->u = u;
}
}
else
{
for ( p = p1; p <= p2; p++ )
{
u = p->v;
if ( u <= v2 )
u += d2;
else if ( u >= v1 )
u += d1;
else
u = ref1->u + FT_MulDiv( u - v1, ref2->u - ref1->u, v2 - v1 );
p->u = u;
}
}
}
FT_LOCAL_DEF( void )
af_glyph_hints_align_weak_points( AF_GlyphHints hints,
AF_Dimension dim )
{
AF_Point points = hints->points;
AF_Point point_limit = points + hints->num_points;
AF_Point* contour = hints->contours;
AF_Point* contour_limit = contour + hints->num_contours;
AF_Flags touch_flag;
AF_Point point;
AF_Point end_point;
AF_Point first_point;
/* PASS 1: Move segment points to edge positions */
if ( dim == AF_DIMENSION_HORZ )
{
touch_flag = AF_FLAG_TOUCH_X;
for ( point = points; point < point_limit; point++ )
{
point->u = point->x;
point->v = point->ox;
}
}
else
{
touch_flag = AF_FLAG_TOUCH_Y;
for ( point = points; point < point_limit; point++ )
{
point->u = point->y;
point->v = point->oy;
}
}
point = points;
for ( ; contour < contour_limit; contour++ )
{
AF_Point first_touched, last_touched;
point = *contour;
end_point = point->prev;
first_point = point;
/* find first touched point */
for (;;)
{
if ( point > end_point ) /* no touched point in contour */
goto NextContour;
if ( point->flags & touch_flag )
break;
point++;
}
first_touched = point;
last_touched = point;
for (;;)
{
FT_ASSERT( point <= end_point &&
( point->flags & touch_flag ) != 0 );
/* skip any touched neighbhours */
while ( point < end_point && ( point[1].flags & touch_flag ) != 0 )
point++;
last_touched = point;
/* find the next touched point, if any */
point ++;
for (;;)
{
if ( point > end_point )
goto EndContour;
if ( ( point->flags & touch_flag ) != 0 )
break;
point++;
}
/* interpolate between last_touched and point */
af_iup_interp( last_touched + 1, point - 1,
last_touched, point );
}
EndContour:
/* special case: only one point was touched */
if ( last_touched == first_touched )
{
af_iup_shift( first_point, end_point, first_touched );
}
else /* interpolate the last part */
{
if ( last_touched < end_point )
af_iup_interp( last_touched + 1, end_point,
last_touched, first_touched );
if ( first_touched > points )
af_iup_interp( first_point, first_touched - 1,
last_touched, first_touched );
}
NextContour:
;
}
/* now save the interpolated values back to x/y */
if ( dim == AF_DIMENSION_HORZ )
{
for ( point = points; point < point_limit; point++ )
point->x = point->u;
}
else
{
for ( point = points; point < point_limit; point++ )
point->y = point->u;
}
}
#ifdef AF_USE_WARPER
FT_LOCAL_DEF( void )
af_glyph_hints_scale_dim( AF_GlyphHints hints,
AF_Dimension dim,
FT_Fixed scale,
FT_Pos delta )
{
AF_Point points = hints->points;
AF_Point points_limit = points + hints->num_points;
AF_Point point;
if ( dim == AF_DIMENSION_HORZ )
{
for ( point = points; point < points_limit; point++ )
point->x = FT_MulFix( point->fx, scale ) + delta;
}
else
{
for ( point = points; point < points_limit; point++ )
point->y = FT_MulFix( point->fy, scale ) + delta;
}
}
#endif /* AF_USE_WARPER */
/* END */