/*
* 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.util.operator.pagedrawer;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.pdfviewer.PageDrawer;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.graphics.PDGraphicsState;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObject;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectForm;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectImage;
import org.apache.pdfbox.util.Matrix;
import org.apache.pdfbox.util.PDFOperator;
import org.apache.pdfbox.util.operator.OperatorProcessor;
/**
* Implementation of content stream operator for page drawer.
*
* @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
* @version $Revision: 1.4 $
*/
public class Invoke extends OperatorProcessor
{
/**
* Log instance.
*/
private static final Log log = LogFactory.getLog(Invoke.class);
/**
* process : Do : Paint the specified XObject (section 4.7).
* @param operator The operator that is being executed.
* @param arguments List
* @throws IOException If there is an error invoking the sub object.
*/
public void process(PDFOperator operator, List<COSBase> arguments) throws IOException
{
PageDrawer drawer = (PageDrawer)context;
PDPage page = drawer.getPage();
COSName objectName = (COSName)arguments.get( 0 );
Map xobjects = drawer.getResources().getXObjects();
PDXObject xobject = (PDXObject)xobjects.get( objectName.getName() );
if ( xobject == null )
{
log.warn("Can't find the XObject for '"+objectName.getName()+"'");
}
else if( xobject instanceof PDXObjectImage )
{
PDXObjectImage image = (PDXObjectImage)xobject;
try
{
image.setGraphicsState(drawer.getGraphicsState());
BufferedImage awtImage = image.getRGBImage();
if (awtImage == null)
{
log.warn("getRGBImage returned NULL");
return;//TODO PKOCH
}
int imageWidth = awtImage.getWidth();
int imageHeight = awtImage.getHeight();
double pageHeight = drawer.getPageSize().getHeight();
log.debug("imageWidth: " + imageWidth + "\t\timageHeight: " + imageHeight);
Matrix ctm = drawer.getGraphicsState().getCurrentTransformationMatrix();
float yScaling = ctm.getYScale();
float angle = (float)Math.acos(ctm.getValue(0, 0)/ctm.getXScale());
if (ctm.getValue(0, 1) < 0 && ctm.getValue(1, 0) > 0)
angle = (-1)*angle;
ctm.setValue(2, 1, (float)(pageHeight - ctm.getYPosition() - Math.cos(angle)*yScaling));
ctm.setValue(2, 0, (float)(ctm.getXPosition() - Math.sin(angle)*yScaling));
// because of the moved 0,0-reference, we have to shear in the opposite direction
ctm.setValue(0, 1, (-1)*ctm.getValue(0, 1));
ctm.setValue(1, 0, (-1)*ctm.getValue(1, 0));
AffineTransform ctmAT = ctm.createAffineTransform();
ctmAT.scale(1f/imageWidth, 1f/imageHeight);
drawer.drawImage( awtImage, ctmAT );
}
catch( Exception e )
{
e.printStackTrace();
log.error(e, e);
}
}
else if(xobject instanceof PDXObjectForm)
{
// save the graphics state
context.getGraphicsStack().push( (PDGraphicsState)context.getGraphicsState().clone() );
PDXObjectForm form = (PDXObjectForm)xobject;
COSStream invoke = (COSStream)form.getCOSObject();
PDResources pdResources = form.getResources();
if(pdResources == null)
{
pdResources = page.findResources();
}
// if there is an optional form matrix, we have to
// map the form space to the user space
Matrix matrix = form.getMatrix();
if (matrix != null)
{
Matrix xobjectCTM = matrix.multiply( context.getGraphicsState().getCurrentTransformationMatrix());
context.getGraphicsState().setCurrentTransformationMatrix(xobjectCTM);
}
getContext().processSubStream( page, pdResources, invoke );
// restore the graphics state
context.setGraphicsState( (PDGraphicsState)context.getGraphicsStack().pop() );
}
}
}