1 files changed, 11 insertions, 5 deletions
diff --git a/thirdparty/harfbuzz/src/hb-style.cc b/thirdparty/harfbuzz/src/hb-style.cc
index f1b44cea53..c7d7d713c2 100644
--- a/thirdparty/harfbuzz/src/hb-style.cc
+++ b/thirdparty/harfbuzz/src/hb-style.cc
@@ -46,15 +46,14 @@
 static inline float
 _hb_angle_to_ratio (float a)
 {
-  return tanf (a * float (M_PI / 180.));
+  return tanf (a * float (-M_PI / 180.));
 }
-#if 0
+
 static inline float
 _hb_ratio_to_angle (float r)
 {
-  return atanf (r) * float (180. / M_PI);
+  return atanf (r) * float (-180. / M_PI);
 }
-#endif
 
 /**
  * hb_style_get_value:
@@ -109,7 +108,14 @@ hb_style_get_value (hb_font_t *font, hb_style_tag_t style_tag)
 	   : 12.f;
   }
   case HB_STYLE_TAG_SLANT_ANGLE:
-    return face->table.post->table->italicAngle.to_float ();
+  {
+    float angle = face->table.post->table->italicAngle.to_float ();
+
+    if (font->slant)
+      angle = _hb_ratio_to_angle (font->slant + _hb_angle_to_ratio (angle));
+
+    return angle;
+  }
   case HB_STYLE_TAG_WIDTH:
     return face->table.OS2->has_data ()
 	   ? face->table.OS2->get_width ()