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Enable autohinting for glyphs rotated by multiples of 90°.

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* src/base/ftobjs.c (FT_Load_Glyph): Alter check for permitted
matrices to allow rotations by multiples of 90°, not only unrotated,
possibly slanted matrices.
This commit is contained in:
James Cloos 2009-05-29 12:59:42 +02:00 committed by Werner Lemberg
parent b4df875196
commit 15e8e237e6
2 changed files with 25 additions and 15 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2009-05-29 James Cloos <cloos@jhcloos.com>
Enable autohinting for glyphs rotated by multiples of 90°.
* src/base/ftobjs.c (FT_Load_Glyph): Alter check for permitted
matrices to allow rotations by multiples of 90°, not only unrotated,
possibly slanted matrices.
2009-05-28 Werner Lemberg <wl@gnu.org>
Remove compiler warning.

32
src/base/ftobjs.c
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@ -588,27 +588,29 @@
* Determine whether we need to auto-hint or not.
* The general rules are:
*
* - Do only auto-hinting if we have a hinter module,
* a scalable font format dealing with outlines,
* and no transforms except simple slants.
* - Do only auto-hinting if we have a hinter module, a scalable font
* format dealing with outlines, and no transforms except simple
* slants and/or rotations by integer multiples of 90 degrees.
*
* - Then, autohint if FT_LOAD_FORCE_AUTOHINT is set
* or if we don't have a native font hinter.
* - Then, auto-hint if FT_LOAD_FORCE_AUTOHINT is set or if we don't
* have a native font hinter.
*
* - Otherwise, auto-hint for LIGHT hinting mode.
*
* - Exception: The font is `tricky' and requires
* the native hinter to load properly.
* - Exception: The font is `tricky' and requires the native hinter to
* load properly.
*/
if ( hinter &&
!( load_flags & FT_LOAD_NO_HINTING ) &&
!( load_flags & FT_LOAD_NO_AUTOHINT ) &&
FT_DRIVER_IS_SCALABLE( driver ) &&
FT_DRIVER_USES_OUTLINES( driver ) &&
!FT_IS_TRICKY( face ) &&
face->internal->transform_matrix.yy > 0 &&
face->internal->transform_matrix.yx == 0 )
if ( hinter &&
!( load_flags & FT_LOAD_NO_HINTING ) &&
!( load_flags & FT_LOAD_NO_AUTOHINT ) &&
FT_DRIVER_IS_SCALABLE( driver ) &&
FT_DRIVER_USES_OUTLINES( driver ) &&
!FT_IS_TRICKY( face ) &&
( ( face->internal->transform_matrix.yx == 0 &&
face->internal->transform_matrix.xx != 0 ) ||
( face->internal->transform_matrix.xx == 0 &&
face->internal->transform_matrix.yx != 0 ) ) )
{
if ( ( load_flags & FT_LOAD_FORCE_AUTOHINT ) ||
!FT_DRIVER_HAS_HINTER( driver ) )