// Copyright 2001, FreeHEP.
package org.freehep.graphicsio.font.truetype;

import com.google.code.appengine.awt.Rectangle;
import java.io.IOException;

/**
 * HEAD Table.
 * 
 * @author Simon Fischer
 * @version $Id: TTFHeadTable.java 8584 2006-08-10 23:06:37Z duns $
 */
public class TTFHeadTable extends TTFVersionTable {

    public static final int FDH_MIXED = 0;

    public static final int FDH_LEFT_TO_RIGHT = 1;

    public static final int FDH_LEFT_TO_RIGHT_NEUTRAL = 2;

    public static final int FDH_RIGHT_TO_LEFT = -1;

    public static final int FDH_RIGHT_TO_LEFT_NEUTRAL = -2;

    public static final int ITLF_SHORT = 0;

    public static final int ITLF_LONG = 1;

    public int fontRevisionMinor, fontRevisionMajor;

    public long checkSumAdjustment;

    public long magicNumber;

    public boolean baseline0, sidebearing0, instrDependOnSize, forcePPEM2Int,
            instrAlterAdvance;

    public int unitsPerEm;

    public byte[] created = new byte[8];

    public byte[] modified = new byte[8];

    public short xMin, yMin, xMax, yMax;

    public boolean macBold, macItalic;

    public int lowestRecPPEM;

    public short fontDirectionHint;

    public short indexToLocFormat, glyphDataFormat;

    public String getTag() {
        return "head";
    }

    public void readTable() throws IOException {
        readVersion();

        fontRevisionMajor = ttf.readUShort();
        fontRevisionMinor = ttf.readUShort();

        checkSumAdjustment = ttf.readULong();
        magicNumber = ttf.readULong();

        ttf.readUShortFlags(); // flags
        baseline0 = ttf.flagBit(0);
        sidebearing0 = ttf.flagBit(1);
        instrDependOnSize = ttf.flagBit(2);
        forcePPEM2Int = ttf.flagBit(3);
        instrAlterAdvance = ttf.flagBit(4);

        unitsPerEm = ttf.readUShort();

        ttf.readFully(created);
        ttf.readFully(modified);

        xMin = ttf.readShort();
        yMin = ttf.readShort();
        xMax = ttf.readShort();
        yMax = ttf.readShort();

        ttf.readUShortFlags(); // macstyle
        macBold = ttf.flagBit(0);
        macItalic = ttf.flagBit(1);

        lowestRecPPEM = ttf.readUShort();
        fontDirectionHint = ttf.readShort();
        indexToLocFormat = ttf.readShort();
        if ((indexToLocFormat != ITLF_LONG) && (indexToLocFormat != ITLF_SHORT))
            System.err.println("Unknown value for indexToLocFormat: "
                    + indexToLocFormat);
        glyphDataFormat = ttf.readShort();
    }

    public String toString() {
        String str = super.toString() + "\n" + "  magicNumber: 0x"
                + Integer.toHexString((int) magicNumber) + " ("
                + (magicNumber == 0x5f0f3cf5 ? "ok" : "wrong") + ")\n";
        str += "  indexToLocFormat: " + indexToLocFormat + " ";
        if (indexToLocFormat == ITLF_LONG)
            str += " (long)\n";
        else if (indexToLocFormat == ITLF_SHORT)
            str += "(short)\n";
        else
            str += "(illegal value)\n";
        str += "  bbox: (" + xMin + "," + yMin + ") : (" + xMax + "," + yMax
                + ")";
        return str;
    }

    public Rectangle getMaxCharBounds() {
        return new Rectangle(xMin, yMin, xMax - xMin, yMax - yMin);
    }
}