add getbbox and getlength to TransposedFont with tests

Tests/test_imagefont.py

@@ -315,16 +315,31 @@ class TestImageFont:
 
         # Original font
         draw.font = font
-        box_size_a = draw.textsize(word)
+        with pytest.warns(DeprecationWarning) as log:
+            box_size_a = draw.textsize(word)
+        assert len(log) == 1
+        bbox_a = draw.textbbox((10, 10), word)
 
         # Rotated font
         draw.font = transposed_font
-        box_size_b = draw.textsize(word)
+        with pytest.warns(DeprecationWarning) as log:
+            box_size_b = draw.textsize(word)
+        assert len(log) == 1
+        bbox_b = draw.textbbox((20, 20), word)
 
         # Check (w,h) of box a is (h,w) of box b
         assert box_size_a[0] == box_size_b[1]
         assert box_size_a[1] == box_size_b[0]
 
+        # Check bbox b is (20, 20, 20 + h, 20 + w)
+        assert bbox_b[0] == 20
+        assert bbox_b[1] == 20
+        assert bbox_b[2] == 20 + bbox_a[3] - bbox_a[1]
+        assert bbox_b[3] == 20 + bbox_a[2] - bbox_a[0]
+
+        # text length is undefined for vertical text
+        pytest.raises(ValueError, draw.textlength, word)
+
     def test_unrotated_transposed_font(self):
         img_grey = Image.new("L", (100, 100))
         draw = ImageDraw.Draw(img_grey)
@@ -336,15 +351,31 @@ class TestImageFont:
 
         # Original font
         draw.font = font
-        box_size_a = draw.textsize(word)
+        with pytest.warns(DeprecationWarning) as log:
+            box_size_a = draw.textsize(word)
+        assert len(log) == 1
+        bbox_a = draw.textbbox((10, 10), word)
+        length_a = draw.textlength(word)
 
         # Rotated font
         draw.font = transposed_font
-        box_size_b = draw.textsize(word)
+        with pytest.warns(DeprecationWarning) as log:
+            box_size_b = draw.textsize(word)
+        assert len(log) == 1
+        bbox_b = draw.textbbox((20, 20), word)
+        length_b = draw.textlength(word)
 
         # Check boxes a and b are same size
         assert box_size_a == box_size_b
 
+        # Check bbox b is (20, 20, 20 + w, 20 + h)
+        assert bbox_b[0] == 20
+        assert bbox_b[1] == 20
+        assert bbox_b[2] == 20 + bbox_a[2] - bbox_a[0]
+        assert bbox_b[3] == 20 + bbox_a[3] - bbox_a[1]
+
+        assert length_a == length_b
+
     def test_rotated_transposed_font_get_mask(self):
         # Arrange
         text = "mask this"

src/PIL/ImageFont.py

@@ -853,6 +853,21 @@ class TransposedFont:
             return im.transpose(self.orientation)
         return im
 
+    def getbbox(self, text, *args, **kwargs):
+        # TransposedFont doesn't support getmask2, move top-left point to (0, 0)
+        # this has no effect on ImageFont and simulates anchor="lt" for FreeTypeFont
+        left, top, right, bottom = self.font.getbbox(text, *args, **kwargs)
+        width = right - left
+        height = bottom - top
+        if self.orientation in (Image.Transpose.ROTATE_90, Image.Transpose.ROTATE_270):
+            return 0, 0, height, width
+        return 0, 0, width, height
+
+    def getlength(self, text, *args, **kwargs):
+        if self.orientation in (Image.Transpose.ROTATE_90, Image.Transpose.ROTATE_270):
+            raise ValueError("text length is undefined for rotated text")
+        return self.font.getlength(text, *args, **kwargs)
+
 
 def load(filename):
     """