public static int tileYToY(int ty, int tileGridYOffset, int tileHeight) {
        return ty*tileHeight + tileGridYOffset;
    }
Converts a vertical tile index into the Y coordinate of
its upper left pixel relative to a given tile grid layout
specified by its Y offset and tile height.
plugins/svg-plugin/batik-codec-fix/src/main/java/org/apache/batik/ext/awt/image/codec/util/SimpleRenderedImage.java