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.
diff --git a/ChangeLog b/ChangeLog
index f1eba38..47d0a4e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -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.
diff --git a/src/base/ftobjs.c b/src/base/ftobjs.c
index 613deef..6e357bb 100644
--- a/src/base/ftobjs.c
+++ b/src/base/ftobjs.c
@@ -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 ) )