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[truetype] Make `IUP' gvar deltas do the same as Apple (#50832). 

When points are not touched by gvar interpolation deltas, FreeType
gave a slightly different result than Apple's CoreText.

The OpenType working group will update the specification to document
the following behaviour: If the two points with deltas to the `left'
and `right' of the untouched point have the same coordinate, then
the inferred delta for the untouched point should be zero.

* src/truetype/ttgxvar.c (tt_delta_interpolate): Implement new
behaviour.
This commit is contained in:
Behdad Esfahbod 2017-05-02 14:38:54 +02:00 committed by Werner Lemberg
parent ba40054c2d
commit 60bf264ee2
2 changed files with 20 additions and 18 deletions
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15
ChangeLog
View File

@ -1,3 +1,18 @@
2017-05-02 Behdad Esfahbod <behdad@behdad.org>
[truetype] Make `IUP' gvar deltas do the same as Apple (#50832).
When points are not touched by gvar interpolation deltas, FreeType
gave a slightly different result than Apple's CoreText.
The OpenType working group will update the specification to document
the following behaviour: If the two points with deltas to the `left'
and `right' of the untouched point have the same coordinate, then
the inferred delta for the untouched point should be zero.
* src/truetype/ttgxvar.c (tt_delta_interpolate): Implement new
behaviour.
2017-05-02 Werner Lemberg <wl@gnu.org>
[autofit] Remove `slight' auto-hint mode again.

23
src/truetype/ttgxvar.c
View File

@ -3081,25 +3081,12 @@
d1 = out1 - in1;
d2 = out2 - in2;
if ( out1 == out2 || in1 == in2 )
/* If the reference points have the same coordinate but different */
/* delta, inferred delta is zero. Otherwise interpolate. */
if ( in1 != in2 || out1 == out2 )
{
for ( p = p1; p <= p2; p++ )
{
out = in_points[p].x;
if ( out <= in1 )
out += d1;
else if ( out >= in2 )
out += d2;
else
out = out1;
out_points[p].x = out;
}
}
else
{
FT_Fixed scale = FT_DivFix( out2 - out1, in2 - in1 );
FT_Fixed scale = in1 != in2 ? FT_DivFix( out2 - out1, in2 - in1 )
: 0;
for ( p = p1; p <= p2; p++ )