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[autofit] Handle single-point contours as segments. 

Doing so allows us to link them to edges – some fonts like
`NotoSansGurmukhi-Regular' have such isolated points sitting exactly
on other outlines.

* src/autofit/aflatin.c (af_latin_hints_compute_segments): Don't
ignore one-point contours but handle them specially as one-point
segments.
(af_latin_hints_compute_edges): Append one-point segments to edges
if possible.
This commit is contained in:
Werner Lemberg 2016-07-04 14:59:22 +02:00
parent 8b8c4408dd
commit 5e353f0786
2 changed files with 80 additions and 5 deletions
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14
ChangeLog
View File

@ -1,3 +1,17 @@
2016-07-04 Werner Lemberg <wl@gnu.org>
[autofit] Handle single-point contours as segments.
Doing so allows us to link them to edges – some fonts like
`NotoSansGurmukhi-Regular' have such isolated points sitting exactly
on other outlines.
* src/autofit/aflatin.c (af_latin_hints_compute_segments): Don't
ignore one-point contours but handle them specially as one-point
segments.
(af_latin_hints_compute_edges): Append one-point segments to edges
if possible.
2016-07-02 Werner Lemberg <wl@gnu.org>
[autofit] Remove unused structure members.

71
src/autofit/aflatin.c
View File

@ -1466,9 +1466,6 @@
FT_Pos prev_max_on_coord = max_on_coord;
if ( point == last ) /* skip singletons -- just in case */
continue;
if ( FT_ABS( last->out_dir ) == major_dir &&
FT_ABS( point->out_dir ) == major_dir )
{
@ -1685,7 +1682,12 @@
passed = 1;
}
if ( !on_edge && FT_ABS( point->out_dir ) == major_dir )
/* if we are not on an edge, check whether the major direction */
/* coincides with the current point's `out' direction, or */
/* whether we have a single-point contour */
if ( !on_edge &&
( FT_ABS( point->out_dir ) == major_dir ||
point == point->prev ) )
{
/* this is the start of a new segment! */
segment_dir = (AF_Direction)point->out_dir;
@ -1719,6 +1721,24 @@
min_on_coord = max_on_coord = point->v;
on_edge = 1;
if ( point == point->prev )
{
/* we have a one-point segment: this is a one-point */
/* contour with `in' and `out' direction set to */
/* AF_DIR_NONE */
segment->pos = (FT_Short)min_pos;
if (point->flags & AF_FLAG_CONTROL)
segment->flags |= AF_EDGE_ROUND;
segment->min_coord = (FT_Short)point->v;
segment->max_coord = (FT_Short)point->v;
segment->height = 0;
on_edge = 0;
segment = NULL;
}
}
point = point->next;
@ -2002,7 +2022,10 @@
FT_Int ee;
if ( seg->height < segment_length_threshold )
/* ignore too short segments and, in this loop, */
/* one-point segments without a direction */
if ( seg->height < segment_length_threshold ||
seg->dir == AF_DIR_NONE )
continue;
/* A special case for serif edges: If they are smaller than */
@ -2064,6 +2087,44 @@
}
}
/* we loop again over all segments to catch one-point segments */
/* without a direction: if possible, link them to existing edges */
for ( seg = segments; seg < segment_limit; seg++ )
{
AF_Edge found = NULL;
FT_Int ee;
if ( seg->dir != AF_DIR_NONE )
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 )
{
found = edge;
break;
}
}
/* one-point segments without a match are ignored */
if ( found )
{
seg->edge_next = found->first;
found->last->edge_next = seg;
found->last = seg;
}
}
/******************************************************************/
/* */