/*

   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */
package org.apache.batik.svggen.font;

import org.apache.batik.svggen.font.table.GlyfDescript;
import org.apache.batik.svggen.font.table.GlyphDescription;

/**
 * An individual glyph within a font.
 * @version $Id: Glyph.java 1804130 2017-08-04 14:41:11Z ssteiner $
 * @author <a href="mailto:david@steadystate.co.uk">David Schweinsberg</a>
 */
public class Glyph {

    protected short leftSideBearing;
    protected int advanceWidth;
    private Point[] points;

    public Glyph(GlyphDescription gd, short lsb, int advance) {
        leftSideBearing = lsb;
        advanceWidth = advance;
        describe(gd);
    }

    public int getAdvanceWidth() {
        return advanceWidth;
    }

    public short getLeftSideBearing() {
        return leftSideBearing;
    }

    public Point getPoint(int i) {
        return points[i];
    }

    public int getPointCount() {
        return points.length;
    }

    /**
     * Resets the glyph to the TrueType table settings
     */
    public void reset() {
    }

    /**
     * @param factor a 16.16 fixed value
     */
    public void scale(int factor) {
        for (Point point : points) {
            //points[i].x = ( points[i].x * factor ) >> 6;
            //points[i].y = ( points[i].y * factor ) >> 6;
            point.x = ((point.x << 10) * factor) >> 26;
            point.y = ((point.y << 10) * factor) >> 26;
        }
        leftSideBearing = (short)(( leftSideBearing * factor) >> 6);
        advanceWidth = (advanceWidth * factor) >> 6;
    }

    /**
     * Set the points of a glyph from the GlyphDescription
     */
    private void describe(GlyphDescription gd) {
        int endPtIndex = 0;
        points = new Point[gd.getPointCount() + 2];
        for (int i = 0; i < gd.getPointCount(); i++) {
            boolean endPt = gd.getEndPtOfContours(endPtIndex) == i;
            if (endPt) {
                endPtIndex++;
            }
            points[i] = new Point(
                    gd.getXCoordinate(i),
                    gd.getYCoordinate(i),
                    (gd.getFlags(i) & GlyfDescript.onCurve) != 0,
                    endPt);
        }

        // Append the origin and advanceWidth points (n & n+1)
        points[gd.getPointCount()] = new Point(0, 0, true, true);
        points[gd.getPointCount()+1] = new Point(advanceWidth, 0, true, true);
    }
}
