public int getMaxTileX() {
        return XToTileX(getMaxX() - 1);
    }
Returns the horizontal index of the rightmost column of tiles.
getMaxTileX() is implemented in terms of getMaxX()
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