Fixed issue with F.crop when cropping outside the input image (#6615)

Co-authored-by: Vasilis Vryniotis <[email protected]>

Author: vfdev-5

test/test_functional_tensor.py

@@ -1104,6 +1104,8 @@ def test_hflip(device):
         (2, 12, 3, 4),  # crop inside top-right corner
         (8, 3, 5, 6),  # crop inside bottom-left corner
         (8, 11, 4, 3),  # crop inside bottom-right corner
+        (50, 50, 10, 10),  # crop outside the image
+        (-50, -50, 10, 10),  # crop outside the image
     ],
 )
 def test_crop(device, top, left, height, width):

torchvision/transforms/functional_tensor.py

@@ -137,7 +137,12 @@ def crop(img: Tensor, top: int, left: int, height: int, width: int) -> Tensor:
     bottom = top + height
 
     if left < 0 or top < 0 or right > w or bottom > h:
-        padding_ltrb = [max(-left, 0), max(-top, 0), max(right - w, 0), max(bottom - h, 0)]
+        padding_ltrb = [
+            max(-left + min(0, right), 0),
+            max(-top + min(0, bottom), 0),
+            max(right - max(w, left), 0),
+            max(bottom - max(h, top), 0),
+        ]
         return pad(img[..., max(top, 0) : bottom, max(left, 0) : right], padding_ltrb, fill=0)
     return img[..., top:bottom, left:right]