_getCoordinatesAndControls: make sure coords are rounded toInt() as gvar expects

ufo2ft will no longer send varLib already-rounded master glyf tables (to give it an opportunity to compute implied oncurves on the pre-rounded coords) so when retrieving coordinates off the glyf table in order to compute gvar deltas we have to round

Lib/fontTools/ttLib/tables/_g_l_y_f.py

@@ -369,7 +369,9 @@ class table__g_l_y_f(DefaultTable.DefaultTable):
             (0, bottomSideY),
         ]
 
-    def _getCoordinatesAndControls(self, glyphName, hMetrics, vMetrics=None):
+    def _getCoordinatesAndControls(
+        self, glyphName, hMetrics, vMetrics=None, roundCoordinates=True
+    ):
         """Return glyph coordinates and controls as expected by "gvar" table.
 
         The coordinates includes four "phantom points" for the glyph metrics,
@@ -442,6 +444,8 @@ class table__g_l_y_f(DefaultTable.DefaultTable):
         # Add phantom points for (left, right, top, bottom) positions.
         phantomPoints = self._getPhantomPoints(glyphName, hMetrics, vMetrics)
         coords.extend(phantomPoints)
+        if roundCoordinates:
+            coords.toInt()
         return coords, controls
 
     def _setCoordinates(self, glyphName, coord, hMetrics, vMetrics=None):

Tests/varLib/instancer/instancer_test.py

@@ -51,8 +51,15 @@ def fvarAxes():
 def _get_coordinates(varfont, glyphname):
     # converts GlyphCoordinates to a list of (x, y) tuples, so that pytest's
     # assert will give us a nicer diff
-    with pytest.deprecated_call():
-        return list(varfont["glyf"].getCoordinatesAndControls(glyphname, varfont)[0])
+    return list(
+        varfont["glyf"]._getCoordinatesAndControls(
+            glyphname,
+            varfont["hmtx"].metrics,
+            varfont["vmtx"].metrics,
+            # the tests expect float coordinates
+            roundCoordinates=False,
+        )[0]
+    )
 
 
 class InstantiateGvarTest(object):