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fix bug #19565, which was caused by an incorrect segment link computation

This commit is contained in:
David Turner 2007-06-11 19:36:48 +00:00
parent b792017faf
commit b38c15da09
3 changed files with 21 additions and 15 deletions
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4
ChangeLog
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@ -1,5 +1,9 @@
2007-06-11 David Turner <david@freetype.org> 2007-06-11 David Turner <david@freetype.org>
* src/autofit/aflatin,c: fix incorrect segment linking computation,
this was the root cause of bug #19565.
* src/autofit/*: some very experimental changes to improve the Latin * src/autofit/*: some very experimental changes to improve the Latin
auto-hinter. note that the new code is disabled by default since this auto-hinter. note that the new code is disabled by default since this
is not stablizied yet. is not stablizied yet.

6
src/autofit/aflatin.c
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@ -843,11 +843,11 @@
{ {
/* the fake segments are introduced to hint the metrics -- */ /* the fake segments are introduced to hint the metrics -- */
/* we must never link them to anything */ /* we must never link them to anything */
if ( seg1->first == seg1->last ) if ( seg1->dir != axis->major_dir || seg1->first == seg1->last )
continue; continue;
for ( seg2 = seg1 + 1; seg2 < segment_limit; seg2++ ) for ( seg2 = segments; seg2 < segment_limit; seg2++ )
if ( seg1->dir + seg2->dir == 0 ) if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos )
{ {
FT_Pos pos1 = seg1->pos; FT_Pos pos1 = seg1->pos;
FT_Pos pos2 = seg2->pos; FT_Pos pos2 = seg2->pos;

26
src/autofit/aflatin2.c
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@ -902,7 +902,7 @@
continue; continue;
for ( seg2 = segments; seg2 < segment_limit; seg2++ ) for ( seg2 = segments; seg2 < segment_limit; seg2++ )
if ( seg1->dir + seg2->dir == 0 ) if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos )
#endif #endif
{ {
FT_Pos pos1 = seg1->pos; FT_Pos pos1 = seg1->pos;
@ -1940,24 +1940,26 @@
/* we want to avoid the absolute worst case which is /* we want to avoid the absolute worst case which is
* when the left and right edges of the span each represent * when the left and right edges of the span each represent
* about 50% of the gray. we'd better want to change this * about 50% of the gray. we'd better want to change this
* to 25/75%, since this is much more pleasant to the eye with * to 20/80%, since this is much more pleasant to the eye with
* very acceptable distortion * very acceptable distortion
*/ */
FT_Pos frac_left = (org_left) & 63; FT_Pos frac_left = (org_left) & 63;
FT_Pos frac_right = (org_right) & 63; FT_Pos frac_right = (org_right) & 63;
if (frac_left >= 20 && frac_left <= 44) if ( frac_left >= 22 && frac_left <= 42 &&
frac_right >= 22 && frac_right <= 42 )
{ {
FT_Pos ref = (frac_left <= 32) ? 16 : 48; org = frac_left;
displacements[count] = delta = ref - frac_left; fit = (org <= 32) ? 13 : 51;
scores[count++] = FT_ABS(delta) + 8; delta = FT_ABS(fit - org);
} displacements[count] = fit - org;
scores[count++] = delta;
if (frac_right >= 20 && frac_right <= 44) org = frac_right;
{ fit = (org <= 32) ? 13 : 51;
FT_Pos ref = (frac_right < 32) ? 16 : 48; delta = FT_ABS(fit - org);
displacements[count] = delta = ref - frac_right; displacement[count] = fit - org;
scores[count++] = FT_ABS(delta) + 8; scores[count++] = delta;
} }
} }