Optimize non-slant extents code

src/hb-font.hh

@@ -188,8 +188,11 @@ struct hb_font_t
     float y2 = em_fscale_y (extents->y_bearing + extents->height);
 
     /* Apply slant. */
+    if (slant_xy)
+    {
       x1 += hb_min (y1 * slant_xy, y2 * slant_xy);
       x2 += hb_max (y1 * slant_xy, y2 * slant_xy);
+    }
 
     extents->x_bearing = floorf (x1);
     extents->y_bearing = floorf (y1);

src/hb-ft.cc

@@ -630,8 +630,11 @@ hb_ft_get_glyph_extents (hb_font_t *font,
   float y2 = y1 + y_mult * -ft_face->glyph->metrics.height;
 
   /* Apply slant. */
+  if (slant_xy)
+  {
     x1 += hb_min (y1 * slant_xy, y2 * slant_xy);
     x2 += hb_max (y1 * slant_xy, y2 * slant_xy);
+  }
 
   extents->x_bearing = floorf (x1);
   extents->y_bearing = floorf (y1);