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[autofit] Improve recognition of flat segments.

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Problem reported by Brad Dunzer <BDunzer@extensis.com>.

* src/autofit/aflatin.c (af_latin_metrics_init_blues): We have
a flat segment if the horizontal distance of best on-points is
larger than a given threshold.
This commit is contained in:
Werner Lemberg 2012-08-05 11:11:44 +02:00
parent e194d7cd61
commit 5b995a8dd8
2 changed files with 49 additions and 5 deletions
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10
ChangeLog
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@ -1,3 +1,13 @@
2012-08-05 Werner Lemberg <wl@gnu.org>
[autofit] Improve recognition of flat segments.
Problem reported by Brad Dunzer <BDunzer@extensis.com>.
* src/autofit/aflatin.c (af_latin_metrics_init_blues): We have
a flat segment if the horizontal distance of best on-points is
larger than a given threshold.
2012-08-05 Werner Lemberg <wl@gnu.org>
[autofit] Variable renamings.

44
src/autofit/aflatin.c
View File

@ -302,11 +302,23 @@
{
FT_Pos best_x = points[best_point].x;
FT_Int prev, next;
FT_Int best_on_point_first, best_on_point_last;
FT_Pos dist;
/* now look for the previous and next points that are not on the */
/* same Y coordinate. Threshold the `closeness'... */
if ( FT_CURVE_TAG( outline.tags[best_point] ) == FT_CURVE_TAG_ON )
{
best_on_point_first = best_point;
best_on_point_last = best_point;
}
else
{
best_on_point_first = -1;
best_on_point_last = -1;
}
/* look for the previous and next points that are not on the */
/* same Y coordinate, then threshold the `closeness'... */
prev = best_point;
next = prev;
@ -324,6 +336,13 @@
if ( FT_ABS( points[prev].x - best_x ) <= 20 * dist )
break;
if ( FT_CURVE_TAG( outline.tags[prev] ) == FT_CURVE_TAG_ON )
{
best_on_point_first = prev;
if ( best_on_point_last < 0 )
best_on_point_last = prev;
}
} while ( prev != best_point );
do
@ -338,12 +357,27 @@
if ( FT_ABS( points[next].x - best_x ) <= 20 * dist )
break;
if ( FT_CURVE_TAG( outline.tags[next] ) == FT_CURVE_TAG_ON )
{
best_on_point_last = next;
if ( best_on_point_first < 0 )
best_on_point_first = next;
}
} while ( next != best_point );
/* now set the `round' flag depending on the segment's kind */
round = FT_BOOL(
FT_CURVE_TAG( outline.tags[prev] ) != FT_CURVE_TAG_ON ||
FT_CURVE_TAG( outline.tags[next] ) != FT_CURVE_TAG_ON );
/* (value 8 is heuristic) */
if ( best_on_point_first >= 0 &&
best_on_point_last >= 0 &&
(FT_UInt)( FT_ABS( points[best_on_point_last].x -
points[best_on_point_first].x ) ) >
metrics->units_per_em / 8 )
round = 0;
else
round = FT_BOOL(
FT_CURVE_TAG( outline.tags[prev] ) != FT_CURVE_TAG_ON ||
FT_CURVE_TAG( outline.tags[next] ) != FT_CURVE_TAG_ON );
FT_TRACE5(( " (%s)\n", round ? "round" : "flat" ));
}