/*

   Copyright 2001,2003  The Apache Software Foundation 

   Licensed 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.table;

import java.io.ByteArrayInputStream;

/**
 * @version $Id: GlyfSimpleDescript.java,v 1.4 2004/08/18 07:15:21 vhardy Exp $
 * @author <a href="mailto:david@steadystate.co.uk">David Schweinsberg</a>
 */
public class GlyfSimpleDescript extends GlyfDescript {

    private final int[] endPtsOfContours;
    private final byte[] flags;
    private final short[] xCoordinates;
    private final short[] yCoordinates;
    private final int count;

    public GlyfSimpleDescript(GlyfTable parentTable, short numberOfContours, ByteArrayInputStream bais) {

        super(parentTable, numberOfContours, bais);
        
        // Simple glyph description
        endPtsOfContours = new int[numberOfContours];
        for (int i = 0; i < numberOfContours; i++) {
            endPtsOfContours[i] = (bais.read()<<8 | bais.read());
        }

        // The last end point index reveals the total number of points
        count = endPtsOfContours[numberOfContours-1] + 1;
        flags = new byte[count];
        xCoordinates = new short[count];
        yCoordinates = new short[count];

        int instructionCount = (bais.read()<<8 | bais.read());
        readInstructions(bais, instructionCount);
        readFlags(count, bais);
        readCoords(count, bais);
    }

    @Override
    public int getEndPtOfContours(int i) {
        return endPtsOfContours[i];
    }

    @Override
    public byte getFlags(int i) {
        return flags[i];
    }

    @Override
    public short getXCoordinate(int i) {
        return xCoordinates[i];
    }

    @Override
    public short getYCoordinate(int i) {
        return yCoordinates[i];
    }

    @Override
    public boolean isComposite() {
        return false;
    }

    @Override
    public int getPointCount() {
        return count;
    }

    @Override
    public int getContourCount() {
        return getNumberOfContours();
    }
    /*
    public int getComponentIndex(int c) {
    return 0;
    }

    public int getComponentCount() {
    return 1;
    }
     */
    /**
     * The table is stored as relative values, but we'll store them as absolutes
     */
    private void readCoords(int count, ByteArrayInputStream bais) {
        short x = 0;
        short y = 0;
        for (int i = 0; i < count; i++) {
            if ((flags[i] & xDual) != 0) {
                if ((flags[i] & xShortVector) != 0) {
                    x += (short) bais.read();
                }
            } else {
                if ((flags[i] & xShortVector) != 0) {
                    x += (short) -((short) bais.read());
                } else {
                    x += (short)(bais.read()<<8 | bais.read());
                }
            }
            xCoordinates[i] = x;
        }

        for (int i = 0; i < count; i++) {
            if ((flags[i] & yDual) != 0) {
                if ((flags[i] & yShortVector) != 0) {
                    y += (short) bais.read();
                }
            } else {
                if ((flags[i] & yShortVector) != 0) {
                    y += (short) -((short) bais.read());
                } else {
                    y += (short)(bais.read()<<8 | bais.read());
                }
            }
            yCoordinates[i] = y;
        }
    }

    /**
     * The flags are run-length encoded
     */
    private void readFlags(int flagCount, ByteArrayInputStream bais) {
        try {
            for (int index = 0; index < flagCount; index++) {
                flags[index] = (byte) bais.read();
                if ((flags[index] & repeat) != 0) {
                    int repeats = bais.read();
                    for (int i = 1; i <= repeats; i++) {
                        flags[index + i] = flags[index];
                    }
                    index += repeats;
                }
            }
        } catch (ArrayIndexOutOfBoundsException e) {
            System.out.println("error: array index out of bounds");
        }
    }
}