Commit 709486db7f5684329bdf39156fadf6bdff6d8fdd
2016-03-20T22:20:32
[autofit] Show `near' points in tracing. * src/autofit/afhints.h (AF_FLAG_NEAR): New macro. * src/autofit/afhints.c (af_glyph_hints_dump_points): Implement it. (af_glyph_hints_reload): Handle AF_FLAG_NEAR.
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diff --git a/ChangeLog b/ChangeLog
index c31597d..4a2a83f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2016-03-20 Werner Lemberg <wl@gnu.org>
+
+ [autofit] Show `near' points in tracing.
+
+ * src/autofit/afhints.h (AF_FLAG_NEAR): New macro.
+
+ * src/autofit/afhints.c (af_glyph_hints_dump_points): Implement it.
+ (af_glyph_hints_reload): Handle AF_FLAG_NEAR.
+
2016-03-18 Alexei Podtelezhnikov <apodtele@gmail.com>
[smooth] Minor refactoring and microoptimizations.
diff --git a/src/autofit/afhints.c b/src/autofit/afhints.c
index 9ed058f..dadeccb 100644
--- a/src/autofit/afhints.c
+++ b/src/autofit/afhints.c
@@ -314,7 +314,7 @@
AF_DUMP(( "Table of points:\n" ));
if ( hints->num_points )
- AF_DUMP(( " index hedge hseg vedge vseg flags"
+ AF_DUMP(( " index hedge hseg vedge vseg flags "
" xorg yorg xscale yscale xfit yfit" ));
else
AF_DUMP(( " (none)\n" ));
@@ -335,7 +335,7 @@
contour++;
}
- AF_DUMP(( " %5d %5s %5s %5s %5s %s "
+ AF_DUMP(( " %5d %5s %5s %5s %5s %s"
" %5d %5d %7.2f %7.2f %7.2f %7.2f\n",
point_idx,
af_print_idx( buf1,
@@ -344,8 +344,11 @@
af_print_idx( buf3,
af_get_edge_index( hints, segment_idx_0, 0 ) ),
af_print_idx( buf4, segment_idx_0 ),
- ( point->flags & AF_FLAG_WEAK_INTERPOLATION ) ? "weak"
- : " -- ",
+ ( point->flags & AF_FLAG_NEAR )
+ ? " near "
+ : ( point->flags & AF_FLAG_WEAK_INTERPOLATION )
+ ? " weak "
+ : "strong",
point->fx,
point->fy,
@@ -813,18 +816,29 @@
AF_Point point;
AF_Point point_limit = points + hints->num_points;
+ /* value 20 in `near_limit' is heuristic */
+ FT_UInt units_per_em = hints->metrics->scaler.face->units_per_EM;
+ FT_Int near_limit = 20 * units_per_em / 2048;
+
/* compute coordinates & Bezier flags, next and prev */
{
FT_Vector* vec = outline->points;
char* tag = outline->tags;
- AF_Point end = points + outline->contours[0];
+ FT_Short endpoint = outline->contours[0];
+ AF_Point end = points + endpoint;
AF_Point prev = end;
FT_Int contour_index = 0;
+ end->fx = (FT_Short)vec[endpoint].x;
+ end->fy = (FT_Short)vec[endpoint].y;
+
for ( point = points; point < point_limit; point++, vec++, tag++ )
{
+ FT_Pos out_x, out_y;
+
+
point->in_dir = (FT_Char)AF_DIR_NONE;
point->out_dir = (FT_Char)AF_DIR_NONE;
@@ -845,6 +859,12 @@
point->flags = AF_FLAG_NONE;
}
+ out_x = point->fx - prev->fx;
+ out_y = point->fy - prev->fy;
+
+ if ( FT_ABS( out_x ) + FT_ABS( out_y ) < near_limit )
+ prev->flags |= AF_FLAG_NEAR;
+
point->prev = prev;
prev->next = point;
prev = point;
@@ -853,8 +873,13 @@
{
if ( ++contour_index < outline->n_contours )
{
- end = points + outline->contours[contour_index];
+ endpoint = outline->contours[contour_index];
+
+ end = points + endpoint;
prev = end;
+
+ end->fx = (FT_Short)vec[endpoint].x;
+ end->fy = (FT_Short)vec[endpoint].y;
}
}
}
@@ -880,17 +905,15 @@
* Compute directions of `in' and `out' vectors.
*
* Note that distances between points that are very near to each
- * other are accumulated. In other words, the auto-hinter
+ * other are accumulated. In other words, the auto-hinter either
* prepends the small vectors between near points to the first
- * non-near vector. All intermediate points are tagged as
- * weak; the directions are adjusted also to be equal to the
- * accumulated one.
+ * non-near vector, or the sum of small vector lengths exceeds a
+ * threshold, thus `grouping' the small vectors. All intermediate
+ * points are tagged as weak; the directions are adjusted also to
+ * be equal to the accumulated one.
*/
- /* value 20 in `near_limit' is heuristic */
- FT_UInt units_per_em = hints->metrics->scaler.face->units_per_EM;
- FT_Int near_limit = 20 * units_per_em / 2048;
- FT_Int near_limit2 = 2 * near_limit - 1;
+ FT_Int near_limit2 = 2 * near_limit - 1;
AF_Point* contour;
AF_Point* contour_limit = hints->contours + hints->num_contours;
@@ -937,7 +960,7 @@
/* now loop over all points of the contour to get */
/* `in' and `out' vector directions */
- curr = first;
+ curr = first;
/*
* We abuse the `u' and `v' fields to store index deltas to the
@@ -960,7 +983,7 @@
point = next;
- next = point->next;
+ next = point->next;
out_x += next->fx - point->fx;
out_y += next->fy - point->fy;
diff --git a/src/autofit/afhints.h b/src/autofit/afhints.h
index 4563565..faa5bdb 100644
--- a/src/autofit/afhints.h
+++ b/src/autofit/afhints.h
@@ -221,6 +221,9 @@ FT_BEGIN_HEADER
/* candidates for weak interpolation have this flag set */
#define AF_FLAG_WEAK_INTERPOLATION ( 1U << 4 )
+ /* the distance to the next point is very small */
+#define AF_FLAG_NEAR ( 1U << 5 )
+
/* edge hint flags */
#define AF_EDGE_NORMAL 0