org.apache.pdfbox.pdmodel.graphics.color.PDCalGray Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of pdfbox Show documentation
Show all versions of pdfbox Show documentation
The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* 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.
*/
package org.apache.pdfbox.pdmodel.graphics.color;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSFloat;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSNumber;
import java.awt.color.ColorSpace;
import java.awt.image.ColorModel;
import java.io.IOException;
/**
* This class represents a Cal Gray color space.
*
* @author Ben Litchfield
* @version $Revision: 1.5 $
*/
public class PDCalGray extends PDColorSpace
{
/**
* The name of this color space.
*/
public static final String NAME = "CalGray";
private COSArray array;
private COSDictionary dictionary;
/**
* Constructor.
*/
public PDCalGray()
{
array = new COSArray();
dictionary = new COSDictionary();
array.add( COSName.CALGRAY );
array.add( dictionary );
}
/**
* Constructor with array.
*
* @param gray The underlying color space.
*/
public PDCalGray( COSArray gray )
{
array = gray;
dictionary = (COSDictionary)array.getObject( 1 );
}
/**
* This will get the number of components that this color space is made up of.
*
* @return The number of components in this color space.
*
* @throws IOException If there is an error getting the number of color components.
*/
public int getNumberOfComponents() throws IOException
{
return 1;
}
/**
* This will return the name of the color space.
*
* @return The name of the color space.
*/
public String getName()
{
return NAME;
}
/**
* Create a Java colorspace for this colorspace.
*
* @return A color space that can be used for Java AWT operations.
*
* @throws IOException If there is an error creating the color space.
*/
protected ColorSpace createColorSpace() throws IOException
{
throw new IOException( "Not implemented" );
}
/**
* Create a Java color model for this colorspace.
*
* @param bpc The number of bits per component.
*
* @return A color model that can be used for Java AWT operations.
*
* @throws IOException If there is an error creating the color model.
*/
public ColorModel createColorModel( int bpc ) throws IOException
{
throw new IOException( "Not implemented" );
}
/**
* Convert this standard java object to a COS object.
*
* @return The cos object that matches this Java object.
*/
public COSBase getCOSObject()
{
return array;
}
/**
* This will get the gamma value. If none is present then the default of 1
* will be returned.
*
* @return The gamma value.
*/
public float getGamma()
{
float retval = 1.0f;
COSNumber gamma = (COSNumber)dictionary.getDictionaryObject( COSName.GAMMA );
if( gamma != null )
{
retval = gamma.floatValue();
}
return retval;
}
/**
* Set the gamma value.
*
* @param value The new gamma value.
*/
public void setGamma( float value )
{
dictionary.setItem( COSName.GAMMA, new COSFloat( value ) );
}
/**
* This will return the whitepoint tristimulus. As this is a required field
* this will never return null. A default of 1,1,1 will be returned if the
* pdf does not have any values yet.
*
* @return The whitepoint tristimulus.
*/
public PDTristimulus getWhitepoint()
{
COSArray wp = (COSArray)dictionary.getDictionaryObject( COSName.WHITE_POINT );
if( wp == null )
{
wp = new COSArray();
wp.add( new COSFloat( 1.0f ) );
wp.add( new COSFloat( 1.0f ) );
wp.add( new COSFloat( 1.0f ) );
dictionary.setItem( COSName.WHITE_POINT, wp );
}
return new PDTristimulus( wp );
}
/**
* This will set the whitepoint tristimulus. As this is a required field
* this null should not be passed into this function.
*
* @param wp The whitepoint tristimulus.
*/
public void setWhitepoint( PDTristimulus wp )
{
COSBase wpArray = wp.getCOSObject();
if( wpArray != null )
{
dictionary.setItem( COSName.WHITE_POINT, wpArray );
}
}
/**
* This will return the BlackPoint tristimulus. This is an optional field but
* has defaults so this will never return null.
* A default of 0,0,0 will be returned if the pdf does not have any values yet.
*
* @return The blackpoint tristimulus.
*/
public PDTristimulus getBlackPoint()
{
COSArray bp = (COSArray)dictionary.getDictionaryObject( COSName.BLACK_POINT );
if( bp == null )
{
bp = new COSArray();
bp.add( new COSFloat( 0.0f ) );
bp.add( new COSFloat( 0.0f ) );
bp.add( new COSFloat( 0.0f ) );
dictionary.setItem( COSName.BLACK_POINT, bp );
}
return new PDTristimulus( bp );
}
/**
* This will set the BlackPoint tristimulus. As this is a required field
* this null should not be passed into this function.
*
* @param bp The BlackPoint tristimulus.
*/
public void setBlackPoint( PDTristimulus bp )
{
COSBase bpArray = null;
if( bp != null )
{
bpArray = bp.getCOSObject();
}
dictionary.setItem( COSName.BLACK_POINT, bpArray );
}
}