fop/src/sandbox/org/apache/fop/render/afp/modca/ImageDataDescriptor.java

/*
 * Copyright 2006 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.
 */

/* $Id$ */

package org.apache.fop.render.afp.modca;

import java.io.IOException;
import java.io.OutputStream;
import org.apache.fop.render.afp.tools.BinaryUtils;

/**
 */
public class ImageDataDescriptor extends AbstractAFPObject {

    private int _xresol = 0;
    private int _yresol = 0;
    private int _width = 0;
    private int _height = 0;

    /**
     * Constructor for a ImageDataDescriptor for the specified
     * resolution, width and height.
     * @param xresol The horizontal resolution of the image.
     * @param yresol The vertical resolution of the image.
     * @param width The width of the image.
     * @param height The height of the height.
     */
    public ImageDataDescriptor(int xresol, int yresol, int width, int height) {

        _xresol = xresol;
        _yresol = yresol;
        _width = width;
        _height = height;

    }

    /**
     * Accessor method to write the AFP datastream for the Image Data Descriptor
     * @param os The stream to write to
     * @throws java.io.IOException
     */
    public void writeDataStream(OutputStream os)
        throws IOException {

        byte[] data = new byte[] {
            0x5A,
            0x00,
            0x20,
            (byte) 0xD3,
            (byte) 0xA6,
            (byte) 0xFB,
            0x00, // Flags
            0x00, // Reserved
            0x00, // Reserved
            0x00, // Unit base - 10 Inches
            0x00, // XRESOL
            0x00, //
            0x00, // YRESOL
            0x00, //
            0x00, // XSIZE
            0x00, //
            0x00, // YSIZE
            0x00, //
            (byte)0xF7, // ID = Set IOCA Function Set
            0x02, // Length
            0x01, // Category = Function set identifier
            0x0B, // FCNSET = IOCA FS 11
        };

        byte[] l = BinaryUtils.convert(data.length - 1, 2);
        data[1] = l[0];
        data[2] = l[1];

        byte[] x = BinaryUtils.convert(_xresol, 2);
        data[10] = x[0];
        data[11] = x[1];

        byte[] y = BinaryUtils.convert(_yresol, 2);
        data[12] = y[0];
        data[13] = y[1];

        byte[] w = BinaryUtils.convert(_width, 2);
        data[14] = w[0];
        data[15] = w[1];

        byte[] h = BinaryUtils.convert(_height, 2);
        data[16] = h[0];
        data[17] = h[1];

        os.write(data);

    }

}