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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.ioca;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.fop.afp.Streamable;
/**
* This class represents the IOCA IDE Structure parameter (X'9B').
*/
public class IDEStructureParameter implements Streamable {
/** The RGB color model used by the IDE Structure parameter */
public static final byte COLOR_MODEL_RGB = (byte)0x01;
/** The YCrCb color model used by the IDE Structure parameter */
public static final byte COLOR_MODEL_YCRCB = (byte)0x02;
/** The CMYK color model used by the IDE Structure parameter */
public static final byte COLOR_MODEL_CMYK = (byte)0x04;
/** The YCbCr color model used by the IDE Structure parameter */
public static final byte COLOR_MODEL_YCBCR = (byte)0x12;
/** additive/subtractive setting for ASFLAG */
private boolean subtractive;
/** setting for GRAYCODE flag */
// private boolean grayCoding; // never written
/** the image color model */
private byte colorModel = COLOR_MODEL_RGB;
/** the array with the number of bits/IDE for each component */
private byte[] bitsPerIDE = new byte[] {(byte)1}; //1-bit by default
/**
* Creates a new IDE Structure parameter. The values are initialized for a bi-level image
* using the RGB color model.
*/
public IDEStructureParameter() {
//nop
}
/**
* Sets the image IDE color model.
*
* @param color the IDE color model.
*/
public void setColorModel(byte color) {
this.colorModel = color;
}
/**
* Establishes the parameter values for the normal RGB 24bit color model.
*/
public void setDefaultRGBColorModel() {
this.colorModel = COLOR_MODEL_RGB;
setUniformBitsPerComponent(3, 8);
}
/**
* Establishes the parameter values for the normal CMYK 32bit color model.
*/
public void setDefaultCMYKColorModel() {
this.colorModel = COLOR_MODEL_CMYK;
setUniformBitsPerComponent(4, 8);
}
/**
* Sets uniform bits per component.
* @param numComponents the number of components
* @param bitsPerComponent number of bits per component
*/
public void setUniformBitsPerComponent(int numComponents, int bitsPerComponent) {
if (bitsPerComponent < 0 || bitsPerComponent >= 256) {
throw new IllegalArgumentException(
"The number of bits per component must be between 0 and 255");
}
this.bitsPerIDE = new byte[numComponents];
for (int i = 0; i < numComponents; i++) {
this.bitsPerIDE[i] = (byte)bitsPerComponent;
}
}
/**
* Sets the array for the bits/IDE, one entry per component.
* @param bitsPerComponent the
*/
public void setBitsPerComponent(int[] bitsPerComponent) {
int numComponents = bitsPerComponent.length;
this.bitsPerIDE = new byte[numComponents];
for (int i = 0; i < numComponents; i++) {
int bits = bitsPerComponent[i];
if (bits < 0 || bits >= 256) {
throw new IllegalArgumentException(
"The number of bits per component must be between 0 and 255");
}
this.bitsPerIDE[i] = (byte)bits;
}
}
/**
* Set either additive or subtractive mode (used for ASFLAG).
* @param subtractive true for subtractive mode, false for additive mode
*/
public void setSubtractive(boolean subtractive) {
this.subtractive = subtractive;
}
/** {@inheritDoc} */
public void writeToStream(OutputStream os) throws IOException {
int length = 7 + bitsPerIDE.length;
byte flags = 0x00;
if (subtractive) {
flags |= 1 << 7;
}
/* graCoding is never written
if (grayCoding) {
flags |= 1 << 6;
}
*/
DataOutputStream dout = new DataOutputStream(os);
dout.writeByte(0x9B); //ID
dout.writeByte(length - 2); //LENGTH
dout.writeByte(flags); //FLAGS
dout.writeByte(this.colorModel); //FORMAT
for (int i = 0; i < 3; i++) {
dout.writeByte(0); //RESERVED
}
dout.write(this.bitsPerIDE); //component sizes
}
}
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