What does cv2.resize() do if input width and height same as resize input and width?

Question

I like fast, compact code so I have a question about this:

def loader(input_path, new_img_width, new_img_height):
    input_image = tifffile.imread(input_path)
    input_image = cv2.resize(input_image, (new_img_width, new_img_height),
                           interpolation=cv2.INTER_NEAREST)
    return input_image

Do I need to add a conditional statement before the call to cv2.resize for the case where new_img_width and new_img_height are the same as in input_image or this conditional statement already in the cv2.resize code?

I don't want spend cycles resizing the image unless it's necessary.

Answer 1

From the source code of resize function, line 4082:

if (dsize == ssize)
{
    // Source and destination are of same size. Use simple copy.
    src.copyTo(dst);
    return;
}