Get the width and height in pixels for the specified image.
The values of
height are returned as -1 if the values cannot be obtained (for instance, if the object is
If the size can not be obtained (e.g. missing support), x and y are set to -1.
a Object instance that implements AtkImageIface
filled with the image width, or -1 if the value cannot be obtained.
filled with the image height, or -1 if the value cannot be obtained.