[visitor_test] Implement glyf table visiting

Lib/fontTools/misc/visitor.py

@@ -105,10 +105,10 @@ class TTVisitor(Visitor):
 
 @TTVisitor.register(TTFont)
 def visit(visitor, font):
-    if hasattr(font, "visited"):
+    if hasattr(visitor, "font"):
         return False
-    font.visited = True
+    visitor.font = font
     for tag in font.keys():
         visitor.visit(font[tag])
-    del font.visited
+    del visitor.font
     return False

Tests/misc/visitor_test.py

@@ -61,6 +61,25 @@ def visit(visitor, obj, attr, metrics):
         metrics[g] = visitor.scale(advance), visitor.scale(lsb)
 
 
+@ScalerVisitor.register_attr(ttLib.getTableClass("glyf"), "glyphs")
+def visit(visitor, obj, attr, glyphs):
+    for g in glyphs.values():
+        if g.isComposite():
+            for component in g.components:
+                component.x = visitor.scale(component.x)
+                component.y = visitor.scale(component.y)
+        else:
+            for attr in ("xMin", "xMax", "yMin", "yMax"):
+                v = getattr(g, attr, None)
+                if v is not None:
+                    setattr(g, attr, visitor.scale(v))
+
+        glyf = visitor.font["glyf"]
+        coordinates = g.getCoordinates(glyf)[0]
+        for i, (x, y) in enumerate(coordinates):
+            coordinates[i] = visitor.scale(x), visitor.scale(y)
+
+
 # GPOS