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[autofit] Blur CJK stems if too many to preserve their gaps

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suzuki toshiya 2011-04-21 10:58:33 +09:00
parent d503b1bce2
commit a345c0e1d5
2 changed files with 41 additions and 0 deletions
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15
ChangeLog
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@ -1,3 +1,18 @@
2011-04-21 rainy6144 <rainy6144@gmail.com>
[autofit] Blur CJK stems if too many to preserve their gaps.
When there are too many stems to preserve their gaps in the
rasterization of CJK Ideographs at a low resolution, blur the
stems instead of showing clumped stems. See
http://lists.gnu.org/archive/html/freetype-devel/2011-02/msg00011.html
http://lists.gnu.org/archive/html/freetype-devel/2011-04/msg00046.html
for detail.
* src/autofit/afcjk.c (af_cjk_hint_edges): Store the position of
the previous stem by `has_last_stem' and `last_stem_pos', and skip
a stem if the current and previous stem are too near to preserve
the gap.
2011-04-18 Werner Lemberg <wl@gnu.org>
Integrate autofitter debugging stuff.

26
src/autofit/afcjk.c
View File

@ -1025,6 +1025,8 @@
AF_Edge anchor = 0;
FT_Pos delta = 0;
FT_Int skipped = 0;
FT_Bool has_last_stem = FALSE;
FT_Pos last_stem_pos = 0;
/* now we align all stem edges. */
@ -1044,12 +1046,34 @@
continue;
}
/* Some CJK characters have so many stems that
* the hinter is likely to merge two adjacent ones.
* To solve this problem, if either edge of a stem
* is too close to the previous one, we avoid
* aligning the two edges, but rather interpolate
* their locations at the end of this function in
* order to preserve the space between the stems.
*/
if ( has_last_stem &&
( edge->pos < last_stem_pos + 64 ||
edge2->pos < last_stem_pos + 64 ) )
{
skipped++;
continue;
}
/* now align the stem */
if ( edge2 < edge )
{
af_cjk_align_linked_edge( hints, dim, edge2, edge );
edge->flags |= AF_EDGE_DONE;
/* We rarely reaches here it seems;
* usually the two edges belonging
* to one stem are marked as DONE together
*/
has_last_stem = TRUE;
last_stem_pos = edge->pos;
continue;
}
@ -1142,6 +1166,8 @@
anchor = edge;
edge->flags |= AF_EDGE_DONE;
edge2->flags |= AF_EDGE_DONE;
has_last_stem = TRUE;
last_stem_pos = edge2->pos;
}
/* make sure that lowercase m's maintain their symmetry */