It turned out that the culprit was, that the surrounding anchor points have no 'out direction' when searching for segments.
The code in afhints.c[1] has the following lines:
af_direction_compute( FT_Pos dx,
FT_Pos dy )
{
FT_Pos ll, ss; /* long and short arm lengths */
...
/* return no direction if arm lengths differ too much */
/* (value 14 is heuristic) */
ss *= 14;
if ( FT_ABS( ll ) <= FT_ABS( ss ) )
dir = AF_DIR_NONE;
For 一 in wqy-zenhei, ss = -5, and ll = -50 or something for a end
point. Hence AF_DIR_NONE.
Cross out that part will solve the problem for "一" , of cause might also screw up some other parts. It's there to keep the tangent small. Any suggestion on how to fix it properly?[1] http://git.savannah.gnu.org/cgit/freetype/freetype2.git/tree/src/autofit/afhints.c#n455
<<attachment: grid-yi1.png>>
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