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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.util.operator.pagedrawer;
import java.awt.geom.AffineTransform;
import java.awt.geom.Area;
import java.awt.geom.GeneralPath;
import java.awt.geom.Point2D;
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.common.PDRectangle;
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 Ben Litchfield
* @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 arguments) throws IOException
{
PageDrawer drawer = (PageDrawer)context;
PDPage page = drawer.getPage();
if (arguments.size() < 1)
{
return;
}
COSBase base0 = arguments.get(0);
if (!(base0 instanceof COSName))
{
return;
}
COSName objectName = (COSName) base0;
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
{
if (image.getImageMask())
{
// set the current non stroking colorstate, so that it can
// be used to create a stencil masked image
image.setStencilColor(drawer.getGraphicsState().getNonStrokingColor());
}
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 )
{
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 formContentstream = form.getCOSStream();
// find some optional resources, instead of using the current resources
PDResources pdResources = form.getResources();
// 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);
}
if (form.getBBox() != null)
{
PDGraphicsState graphicsState = context.getGraphicsState();
PDRectangle bBox = form.getBBox();
float x1 = bBox.getLowerLeftX();
float y1 = bBox.getLowerLeftY();
float x2 = bBox.getUpperRightX();
float y2 = bBox.getUpperRightY();
Point2D p0 = drawer.transformedPoint(x1, y1);
Point2D p1 = drawer.transformedPoint(x2, y1);
Point2D p2 = drawer.transformedPoint(x2, y2);
Point2D p3 = drawer.transformedPoint(x1, y2);
GeneralPath bboxPath = new GeneralPath();
bboxPath.moveTo((float) p0.getX(), (float) p0.getY());
bboxPath.lineTo((float) p1.getX(), (float) p1.getY());
bboxPath.lineTo((float) p2.getX(), (float) p2.getY());
bboxPath.lineTo((float) p3.getX(), (float) p3.getY());
bboxPath.closePath();
Area resultClippingArea = new Area(graphicsState.getCurrentClippingPath());
Area newArea = new Area(bboxPath);
resultClippingArea.intersect(newArea);
graphicsState.setCurrentClippingPath(resultClippingArea);
}
getContext().processSubStream(page, pdResources, formContentstream);
// restore the graphics state
context.setGraphicsState( (PDGraphicsState)context.getGraphicsStack().pop() );
}
}
}