Subversion Repositories mkgmap

/*
 * Copyright (C) 2011.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 or
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */
package uk.me.parabola.mkgmap.typ;

import uk.me.parabola.imgfmt.app.typ.ColourInfo;
import uk.me.parabola.imgfmt.app.typ.TypData;
import uk.me.parabola.imgfmt.app.typ.TypPolygon;
import uk.me.parabola.mkgmap.scan.SyntaxException;
import uk.me.parabola.mkgmap.scan.TokenScanner;

/**
 * Process lines from the polygon section of a typ.txt file.
 *
 * This is the simplest, so all the work is done in the superclass.
 *
 * @author Steve Ratcliffe
 */
class PolygonSection extends CommonSection implements ProcessSection {

        private final TypPolygon current = new TypPolygon();

        PolygonSection(TypData data) {
                super(data);
        }

        public void processLine(TokenScanner scanner, String name, String value) {
                if (commonKey(scanner, current, name, value))
                        return;

                warnUnknown(name);
        }

        /**
         * Add the polygon to the data and reset for the next.
         */
        public void finish(TokenScanner scanner) {
                validate(scanner);
                data.addPolygon(current);
        }

        /**
         * Check xmp restrictions for polygons.
         *
         * The main one is that bitmaps must be 32x32.  Only certain numbers of colours are
         * allowed as well.
         */
        protected void xpmCheck(TokenScanner scanner, ColourInfo colourInfo) {
                int width = colourInfo.getWidth();
                int height = colourInfo.getHeight();

                switch (colourInfo.getNumberOfColours()) {
                case 1:
                case 2:
                case 4:
                        break;
                default:
                        throw new SyntaxException(scanner, "Polygons must have 1, 2 or 4 colours");
                }

                if (width == 0 && height == 0)
                        return;

                if (height != 32 || width != 32)
                        throw new SyntaxException(scanner, "Polygon bitmaps must be 32x32");
        }
}