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freetype2
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[base] Fortify emboldening code against egregious distortions. 

* src/base/ftoutln.c (FT_Outline_EmboldenXY): Threshold emboldening
strength when it leads to segment collapse.
This commit is contained in:
Alexei Podtelezhnikov 2012-11-04 00:57:57 -04:00
parent 48ce226ae3
commit dd5718c7d6
2 changed files with 24 additions and 3 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2012-11-04 Alexei Podtelezhnikov <apodtele@gmail.com>
[base] Fortify emboldening code against egregious distortions.
* src/base/ftoutln.c (FT_Outline_EmboldenXY): Threshold emboldening
strength when it leads to segment collapse.
2012-11-03 Alexei Podtelezhnikov <apodtele@gmail.com>
[base] Clean up emboldening code and improve comments there.

20
src/base/ftoutln.c
View File

@ -922,7 +922,7 @@
for ( c = 0; c < outline->n_contours; c++ )
{
FT_Vector in, out, shift;
FT_Fixed l_in, l_out, d;
FT_Fixed l_in, l_out, l, q, d;
int last = outline->contours[c];
@ -962,8 +962,22 @@
else
shift.y = -shift.y;
shift.x = FT_MulDiv( shift.x, xstrength, d );
shift.y = FT_MulDiv( shift.y, ystrength, d );
/* threshold strength to better handle collapsing segments */
l = FT_MIN( l_in, l_out );
q = out.x * in.y - out.y * in.x;
if ( orientation == FT_ORIENTATION_TRUETYPE )
q = -q;
if ( xstrength * q < d * l )
shift.x = FT_MulDiv( shift.x, xstrength, d );
else
shift.x = FT_MulDiv( shift.x, l, q );
if ( ystrength * q < d * l )
shift.y = FT_MulDiv( shift.y, ystrength, d );
else
shift.y = FT_MulDiv( shift.y, l, q );
}
else
shift.x = shift.y = 0;