public final int getMaxX() {
        return getMinX() + getWidth();
    }
Returns the X coordinate of the column immediatetely to the
right of the rightmost column of the image.  getMaxX() is
implemented in terms of getMinX() and getWidth() and so does
not need to be implemented by subclasses.
plugins/svg-plugin/batik-codec-fix/src/main/java/org/apache/batik/ext/awt/image/codec/util/SimpleRenderedImage.java