bpo-25451: Add transparency methods to tkinter.PhotoImage. (GH-10406)

2 files changed, 18 insertions, 0 deletions

diff --git a/Lib/tkinter/__init__.py b/Lib/tkinter/__init__.py
index ae493ed..57d5b25 100644
--- a/Lib/tkinter/__init__.py
+++ b/Lib/tkinter/__init__.py
@@ -4124,6 +4124,15 @@ class PhotoImage(Image):
             args = args + ('-from',) + tuple(from_coords)
         self.tk.call(args)
 
+    def transparency_get(self, x, y):
+        """Return True if the pixel at x,y is transparent."""
+        return self.tk.getboolean(self.tk.call(
+            self.name, 'transparency', 'get', x, y))
+
+    def transparency_set(self, x, y, boolean):
+        """Set the transparency of the pixel at x,y."""
+        self.tk.call(self.name, 'transparency', 'set', x, y, boolean)
+
 
 class BitmapImage(Image):
     """Widget which can display images in XBM format."""
diff --git a/Lib/tkinter/test/test_tkinter/test_images.py b/Lib/tkinter/test/test_tkinter/test_images.py
index 85a8cd0..2805d35 100644
--- a/Lib/tkinter/test/test_tkinter/test_images.py
+++ b/Lib/tkinter/test/test_tkinter/test_images.py
@@ -320,6 +320,15 @@ class PhotoImageTest(AbstractTkTest, unittest.TestCase):
         self.assertEqual(image3.get(0, 0), image.get(4, 6))
         self.assertEqual(image3.get(1, 2), image.get(5, 8))
 
+    def test_transparency(self):
+        image = self.create()
+        self.assertEqual(image.transparency_get(0, 0), True)
+        self.assertEqual(image.transparency_get(4, 6), False)
+        image.transparency_set(4, 6, True)
+        self.assertEqual(image.transparency_get(4, 6), True)
+        image.transparency_set(4, 6, False)
+        self.assertEqual(image.transparency_get(4, 6), False)
+
 
 tests_gui = (MiscTest, BitmapImageTest, PhotoImageTest,)