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/*
 * 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.fontbox.ttf;

import java.io.IOException;

/**
 * A table in a true type font.
 * 
 * @author Ben Litchfield
 */
public class HorizontalMetricsTable extends TTFTable
{
    /**
     * A tag that identifies this table type.
     */
    public static final String TAG = "hmtx";
    
    private int[] advanceWidth;
    private short[] leftSideBearing;
    private short[] nonHorizontalLeftSideBearing;
    private int numHMetrics;

    HorizontalMetricsTable(TrueTypeFont font)
    {
        super(font);
    }

    /**
     * This will read the required data from the stream.
     * 
     * @param ttf The font that is being read.
     * @param data The stream to read the data from.
     * @throws IOException If there is an error reading the data.
     */
    void read(TrueTypeFont ttf, TTFDataStream data) throws IOException
    {
        HorizontalHeaderTable hHeader = ttf.getHorizontalHeader();
        if (hHeader == null)
        {
            throw new IOException("Could not get hmtx table");
        }
        numHMetrics = hHeader.getNumberOfHMetrics();
        int numGlyphs = ttf.getNumberOfGlyphs();

        int bytesRead = 0;
        advanceWidth = new int[ numHMetrics ];
        leftSideBearing = new short[ numHMetrics ];
        for( int i=0; i