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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.state;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.common.COSObjectable;
import org.apache.pdfbox.pdmodel.common.function.PDFunction;
import org.apache.pdfbox.pdmodel.graphics.PDXObject;
import org.apache.pdfbox.pdmodel.graphics.form.PDTransparencyGroup;
/**
* Soft mask.
*
* @author Kühn & Weyh Software, GmbH
*/
public final class PDSoftMask implements COSObjectable
{
/**
* Creates a new soft mask.
*
* @param dictionary SMask
*/
public static PDSoftMask create(COSBase dictionary)
{
if (dictionary instanceof COSName)
{
if (COSName.NONE.equals(dictionary))
{
return null;
}
else
{
LOG.warn("Invalid SMask " + dictionary);
return null;
}
}
else if (dictionary instanceof COSDictionary)
{
return new PDSoftMask((COSDictionary) dictionary);
}
else
{
LOG.warn("Invalid SMask " + dictionary);
return null;
}
}
private static final Log LOG = LogFactory.getLog(PDSoftMask.class);
private final COSDictionary dictionary;
private COSName subType = null;
private PDTransparencyGroup group = null;
private COSArray backdropColor = null;
private PDFunction transferFunction = null;
/**
* Creates a new soft mask.
*/
public PDSoftMask(COSDictionary dictionary)
{
super();
this.dictionary = dictionary;
}
@Override
public COSDictionary getCOSObject()
{
return dictionary;
}
/**
* Returns the subtype of the soft mask (Alpha, Luminosity) - S entry
*/
public COSName getSubType()
{
if (subType == null)
{
subType = (COSName) getCOSObject().getDictionaryObject(COSName.S);
}
return subType;
}
/**
* Returns the G entry of the soft mask object
*
* @return form containing the transparency group
* @throws IOException
*/
public PDTransparencyGroup getGroup() throws IOException
{
if (group == null)
{
COSBase cosGroup = getCOSObject().getDictionaryObject(COSName.G);
if (cosGroup != null)
{
group = (PDTransparencyGroup) PDXObject.createXObject(cosGroup, null);
}
}
return group;
}
/**
* Returns the backdrop color.
*/
public COSArray getBackdropColor()
{
if (backdropColor == null)
{
backdropColor = (COSArray) getCOSObject().getDictionaryObject(COSName.BC);
}
return backdropColor;
}
/**
* Returns the transfer function.
* @throws IOException If we are unable to create the PDFunction object.
*/
public PDFunction getTransferFunction() throws IOException
{
if (transferFunction == null)
{
COSBase cosTF = getCOSObject().getDictionaryObject(COSName.TR);
if (cosTF != null)
{
transferFunction = PDFunction.create(cosTF);
}
}
return transferFunction;
}
}