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Code Issues 4 Releases Wiki Activity

[autofit] For edges, reject segments wider than 1px (#41334). 

* src/autofit/afhints.h (AF_SegmentRec): New member `delta'.

* src/autofit/aflatin.c (af_latin_hints_compute_segments): Compute
`delta'.
(af_latin_hints_compute_edges): Reject segments with a delta larger
than 0.5px.
This commit is contained in:
Werner Lemberg 2016-07-15 10:23:11 +02:00
parent ff655437e3
commit 894c0228ca
3 changed files with 27 additions and 6 deletions
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11
ChangeLog
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@ -1,3 +1,14 @@
2016-07-15 Werner Lemberg <wl@gnu.org>
[autofit] For edges, reject segments wider than 1px (#41334).
* src/autofit/afhints.h (AF_SegmentRec): New member `delta'.
* src/autofit/aflatin.c (af_latin_hints_compute_segments): Compute
`delta'.
(af_latin_hints_compute_edges): Reject segments with a delta larger
than 0.5px.
2016-07-14 Werner Lemberg <wl@gnu.org>
* include/freetype/freetype.h (FT_IS_NAMED_INSTANCE): New macro.

1
src/autofit/afhints.h
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@ -260,6 +260,7 @@ FT_BEGIN_HEADER
FT_Byte flags; /* edge/segment flags for this segment */
FT_Char dir; /* segment direction */
FT_Short pos; /* position of segment */
FT_Short delta; /* deviation from segment position */
FT_Short min_coord; /* minimum coordinate of segment */
FT_Short max_coord; /* maximum coordinate of segment */
FT_Short height; /* the hinted segment height */

21
src/autofit/aflatin.c
View File

@ -1536,8 +1536,9 @@
/* points are different: we are just leaving an edge, thus */
/* record a new segment */
segment->last = point;
segment->pos = (FT_Short)( ( min_pos + max_pos ) >> 1 );
segment->last = point;
segment->pos = (FT_Short)( ( min_pos + max_pos ) >> 1 );
segment->delta = (FT_Short)FT_ABS( ( max_pos - min_pos ) >> 1 );
/* a segment is round if either its first or last point */
/* is a control point, and the length of the on points */
@ -1966,6 +1967,7 @@
FT_Fixed scale;
FT_Pos edge_distance_threshold;
FT_Pos segment_length_threshold;
FT_Pos segment_width_threshold;
axis->num_edges = 0;
@ -1987,9 +1989,15 @@
* corresponding threshold in font units.
*/
if ( dim == AF_DIMENSION_HORZ )
segment_length_threshold = FT_DivFix( 64, hints->y_scale );
segment_length_threshold = FT_DivFix( 64, hints->y_scale );
else
segment_length_threshold = 0;
segment_length_threshold = 0;
/*
* Similarly, we ignore segments that have a width delta
* larger than 0.5px (i.e., a width larger than 1px).
*/
segment_width_threshold = FT_DivFix( 32, scale );
/*********************************************************************/
/* */
@ -2022,9 +2030,10 @@
FT_Int ee;
/* ignore too short segments and, in this loop, */
/* one-point segments without a direction */
/* ignore too short segments, too wide ones, and, in this loop, */
/* one-point segments without a direction */
if ( seg->height < segment_length_threshold ||
seg->delta > segment_width_threshold ||
seg->dir == AF_DIR_NONE )
continue;