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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;
/**
* The Presentation Text Descriptor specifies the units of measure for the
* Presentation Text object space, the size of the Presentation Text object
* space, and the initial values for modal parameters, called initial text
* conditions. Initial values not provided are defaulted by the controlling
* environment or the receiving device.
*
* The Presentation Text Descriptor provides the following initial values:
* - Unit base
* - Xp-units per unit base
* - Yp-units per unit base
* - Xp-extent of the presentation space
* - Yp-extent of the presentation space
* - Initial text conditions.
*
* The initial text conditions are values provided by the Presentation Text
* Descriptor to initialize the modal parameters of the control sequences.
* Modal control sequences typically are characterized by the word set in
* the name of the control sequence. Modal parameters are identified as such
* in their semantic descriptions.
*
*/
public class PresentationTextDescriptor extends AbstractDescriptor {
/**
* Constructor a PresentationTextDescriptor for the specified
* width and height.
*
* @param width The width of the page.
* @param height The height of the page.
* @param widthRes The width resolution of the page.
* @param heightRes The height resolution of the page.
*/
public PresentationTextDescriptor(int width, int height,
int widthRes, int heightRes) {
super(width, height, widthRes, heightRes);
}
/** {@inheritDoc} */
public void writeToStream(OutputStream os) throws IOException {
byte[] data = new byte[23];
copySF(data, Type.MIGRATION, Category.PRESENTATION_TEXT);
data[1] = 0x00; // length
data[2] = 0x16;
data[9] = 0x00;
data[10] = 0x00;
byte[] xdpi = BinaryUtils.convert(widthRes * 10, 2);
data[11] = xdpi[0]; // xdpi
data[12] = xdpi[1];
byte[] ydpi = BinaryUtils.convert(heightRes * 10, 2);
data[13] = ydpi[0]; // ydpi
data[14] = ydpi[1];
byte[] x = BinaryUtils.convert(width, 3);
data[15] = x[0];
data[16] = x[1];
data[17] = x[2];
byte[] y = BinaryUtils.convert(height, 3);
data[18] = y[0];
data[19] = y[1];
data[20] = y[2];
data[21] = 0x00;
data[22] = 0x00;
os.write(data);
}
}
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