/*
 * $Copyright: copyright (c) 2003-2008, e.e d3si9n $
 * $License: 
 * This source code is part of DoubleType.
 * DoubleType is a graphical typeface designer.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * In addition, as a special exception, e.e d3si9n gives permission to
 * link the code of this program with any Java Platform that is available
 * to public with free of charge, including but not limited to
 * Sun Microsystem's JAVA(TM) 2 RUNTIME ENVIRONMENT (J2RE),
 * and distribute linked combinations including the two.
 * You must obey the GNU General Public License in all respects for all 
 * of the code used other than Java Platform. If you modify this file, 
 * you may extend this exception to your version of the file, but you are not
 * obligated to do so. If you do not wish to do so, delete this exception
 * statement from your version.
 * $
 */
 
 
package org.doubletype.ossa.truetype;

import java.io.*;
import java.util.*;

/**
 * HtmxWriter depends on GlyfWriter.
 * 
 * @author e.e
 */
public class HdmxWriter extends FontFormatWriter {    
	static public int getNumOfPixelSizes() {
		return TTPixelSize.getList().size();
	}
	
	static public ArrayList<TTPixelSize> getPixelSizes() {
		return TTPixelSize.getList();
	}
	
	private int m_numGlyphs = 98; // set by GlyfWriter
	
	public HdmxWriter() {
		super();
	}
	
	/** set the number of glyphs in the font */
	public void setNumGlyphs(int a_value) {
		m_numGlyphs = a_value;
		
		for (TTPixelSize pixelSize: getPixelSizes()) {
			pixelSize.setPixelWidthsSize(a_value);
		} // for pixelSize
	}
	
	public void updatePixelWidth(int a_glyphIndex, TTGlyph a_glyph) {
		double advanceWidth = a_glyph.getAdvanceWidth();
		double em = TTPixelSize.getEm();
		
		for (TTPixelSize pixelSize: TTPixelSize.getList()) {
			int width = (int) Math.round(((double) pixelSize.getPixel() * advanceWidth) / em);
			pixelSize.setPixelWidth(a_glyphIndex, width);
		} // pixelSize
	}
	
	/**
	 * writes htmx record.
	 * The size of a device record is calculated to align it to 32bit boundary.
	 */
	public void write() throws IOException {		
		int numOfPads = 4 - ((m_numGlyphs + 2) % 4);
		if (numOfPads == 4) {
		    numOfPads = 0;
		} // if
		int size = m_numGlyphs + 2 + numOfPads; // 2 comes from the ppem and max
		
		// format version number
		writeInt16(0);
		
		// number of device records
		writeInt16(getNumOfPixelSizes());
		//System.out.printf("num of pixel sizes %d\n", getNumOfPixelSizes());
		// size of device record
		writeInt32(size);
		//System.out.printf("num of glyphs %d\n", m_numGlyphs);
		for (TTPixelSize pixelSize: getPixelSizes()) {
			writeUInt8(pixelSize.getPixel());
			writeUInt8(pixelSize.getMaxPixelWidth());
			for (int pixelWidth: pixelSize.getPixelWidths()) {
				writeUInt8(pixelWidth);
			} // for pixelWidth
			
			for (int j = 0; j < numOfPads; j++) {
				writeUInt8(0);
			} // for j				
		} // for pixelSize
		
		pad();
	}
	
	protected String getTag() {
		return "hdmx";
	}
}
