The test shows four smiley images: the leftmost one is the reference,
and the three on the right are the three sub-tests. The test is passed
if the following conditions are met:
The image in the first sub-test is shown within the blue rectangle,
its aspect ratio preserved and with white bars between the blue rectangle
and the left and right edges of the image.
The image in the second sub-test is shown within the blue rectangle,
its aspect ratio preserved and with white bars between the blue rectangle
and the top and bottom edges of the image.
The image in the third sub-test is shown stretched, having the same
size as the blue rectangle shown on the left of the test slide underneath
the text "Viewport 2".
