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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.
*/
/* $Id$ */
package org.apache.fop.afp.modca;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.fop.afp.util.BinaryUtils;
/**
* GOCA Graphics Data Descriptor
*/
public class GraphicsDataDescriptor extends AbstractDescriptor {
private final int xlwind;
private final int xrwind;
private final int ybwind;
private final int ytwind;
/**
* Main constructor
*
* @param xlwind
* the left edge of the graphics window
* @param xrwind
* the right edge of the graphics window
* @param ybwind
* the top edge of the graphics window
* @param ytwind
* the bottom edge of the graphics window
* @param widthRes
* the width resolution of the graphics window
* @param heightRes
* the height resolution of the graphics window
*/
public GraphicsDataDescriptor(int xlwind, int xrwind, int ybwind,
int ytwind, int widthRes, int heightRes) {
this.xlwind = xlwind;
this.xrwind = xrwind;
this.ybwind = ybwind;
this.ytwind = ytwind;
super.widthRes = widthRes;
super.heightRes = heightRes;
}
/** {@inheritDoc} */
public void writeToStream(OutputStream os) throws IOException {
byte[] headerData = new byte[9];
copySF(headerData, Type.DESCRIPTOR, Category.GRAPHICS);
byte[] drawingOrderSubsetData = getDrawingOrderSubset();
byte[] windowSpecificationData = getWindowSpecification();
byte[] len = BinaryUtils.convert(headerData.length
+ drawingOrderSubsetData.length
+ windowSpecificationData.length - 1, 2);
headerData[1] = len[0];
headerData[2] = len[1];
os.write(headerData);
os.write(drawingOrderSubsetData);
os.write(windowSpecificationData);
}
/**
* Returns the drawing order subset data
*
* @return the drawing order subset data
*/
private byte[] getDrawingOrderSubset() {
final byte[] data = new byte[] {
// Drawing order subset
(byte) 0xF7,
7, // LENGTH
(byte) 0xB0, // drawing order subset
0x00, // reserved (must be zero)
0x00, // reserved (must be zero)
0x02, // SUBLEV
0x00, // VERSION 0
0x01, // LENGTH (of following field)
0x00 // GEOM
};
return data;
}
private static final int ABS = 64;
private static final int IMGRES = 16;
/**
* Returns the window specification data
*
* @return the window specification data
*/
private byte[] getWindowSpecification() {
byte[] xlcoord = BinaryUtils.convert(xlwind, 2);
byte[] xrcoord = BinaryUtils.convert(xrwind, 2);
byte[] xbcoord = BinaryUtils.convert(ybwind, 2);
byte[] ytcoord = BinaryUtils.convert(ytwind, 2);
byte[] xResol = BinaryUtils.convert(widthRes * 10, 2);
byte[] yResol = BinaryUtils.convert(heightRes * 10, 2);
byte[] imxyres = xResol;
// Window specification
final byte[] data = new byte[] {
(byte) 0xF6,
18, // LENGTH
(ABS + IMGRES), // FLAGS (ABS)
0x00, // reserved (must be zero)
0x00, // CFORMAT (coordinate format - 16bit high byte first signed)
0x00, // UBASE (unit base - ten inches)
xResol[0], // XRESOL
xResol[1],
yResol[0], // YRESOL
yResol[1],
imxyres[0], // IMXYRES (Number of image points per ten inches
imxyres[1], // in X and Y directions)
xlcoord[0], // XLWIND
xlcoord[1],
xrcoord[0], // XRWIND
xrcoord[1],
xbcoord[0], // YBWIND
xbcoord[1],
ytcoord[0], // YTWIND
ytcoord[1]
};
return data;
}
}
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