Fix handling all color types in pygame.transform.threshold (#3156)

* Handle more color values in _color_from_obj

* Test all color arguments

Author: damusss

src_c/transform.c

@@ -1830,7 +1830,7 @@ _color_from_obj(PyObject *color_obj, SDL_Surface *surf, Uint8 rgba_default[4],
 {
     if (color_obj) {
         if (!pg_MappedColorFromObj(color_obj, surf, color,
-                                   PG_COLOR_HANDLE_INT)) {
+                                   PG_COLOR_HANDLE_ALL)) {
             return -1;
         }
     }

test/transform_test.py

@@ -1147,6 +1147,13 @@ def test_threshold__subclassed_surface(self):
         self.assertEqual(dest_surface.get_size(), expected_size)
         self.assertEqual(dest_surface.get_flags(), expected_flags)
 
+    def test_threshold_all_color_types(self):
+        s1 = pygame.Surface((32, 32), SRCALPHA, 32)
+        s2 = pygame.Surface((32, 32), SRCALPHA, 32)
+
+        for color in [(0, 255, 0), (255, 0, 0, 0), 0, "blue", pygame.Color("#FFFFFF")]:
+            pygame.transform.threshold(s1, s2, color, color, color)
+
     def test_laplacian(self):
         """ """