public int getMaxTileY() {
        return YToTileY(getMaxY() - 1);
    }
Returns the vertical index of the bottom row of tiles.  getMaxTileY()
is implemented in terms of getMaxY() 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