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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.image.BufferedImage;
import java.io.IOException;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.pdfviewer.PageDrawer;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDInlinedImage;
import org.apache.pdfbox.util.ImageParameters;
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: 1.2 $
*/
public class BeginInlineImage extends OperatorProcessor
{
/**
* Log instance.
*/
private static final Log LOG = LogFactory.getLog(BeginInlineImage.class);
/**
* process : BI : begin inline image.
* @param operator The operator that is being executed.
* @param arguments List
* @throws IOException If there is an error displaying the inline image.
*/
public void process(PDFOperator operator, List arguments) throws IOException
{
PageDrawer drawer = (PageDrawer)context;
PDPage page = drawer.getPage();
//begin inline image object
ImageParameters params = operator.getImageParameters();
PDInlinedImage image = new PDInlinedImage();
image.setImageParameters( params );
image.setImageData( operator.getImageData() );
if (params.isStencil())
{
//TODO implement inline image stencil masks
LOG.warn("Stencil masks are not implemented, background may be incorrect");
}
BufferedImage awtImage = image.createImage( context.getColorSpaces() );
if (awtImage == null)
{
LOG.warn("BeginInlineImage.process(): createImage returned NULL");
return;
}
int imageWidth = awtImage.getWidth();
int imageHeight = awtImage.getHeight();
double pageHeight = drawer.getPageSize().getHeight();
Matrix ctm = drawer.getGraphicsState().getCurrentTransformationMatrix();
int rotationAngle = page.findRotation();
// normalize the rotation angle
while (rotationAngle < 0)
{
rotationAngle += 360;
}
while (rotationAngle >= 360)
{
rotationAngle -= 360;
}
AffineTransform ctmAT = ctm.createAffineTransform();
ctmAT.scale(1f/imageWidth, 1f/imageHeight);
Matrix rotationMatrix = new Matrix();
rotationMatrix.setFromAffineTransform( ctmAT );
// calculate the inverse rotation angle
// scaleX = m00 = cos
// shearX = m01 = -sin
// tan = sin/cos
double angle = Math.atan(ctmAT.getShearX()/ctmAT.getScaleX());
Matrix translationMatrix = null;
if (rotationAngle == 0 || rotationAngle == 180)
{
translationMatrix = Matrix.getTranslatingInstance((float)(Math.sin(angle)*ctm.getXScale()), (float)(pageHeight-2*ctm.getYPosition()-Math.cos(angle)*ctm.getYScale()));
}
else if (rotationAngle == 90 || rotationAngle == 270)
{
translationMatrix = Matrix.getTranslatingInstance((float)(Math.sin(angle)*ctm.getYScale()), (float)(pageHeight-2*ctm.getYPosition()));
}
rotationMatrix = rotationMatrix.multiply(translationMatrix);
rotationMatrix.setValue(0, 1, (-1)*rotationMatrix.getValue(0, 1));
rotationMatrix.setValue(1, 0, (-1)*rotationMatrix.getValue(1, 0));
AffineTransform at = new AffineTransform(
rotationMatrix.getValue(0,0),rotationMatrix.getValue(0,1),
rotationMatrix.getValue(1,0), rotationMatrix.getValue( 1, 1),
rotationMatrix.getValue(2,0),rotationMatrix.getValue(2,1)
);
drawer.drawImage(awtImage, at);
}
}