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This is a fork of http://sourceforge.net/projects/jpodlib/ as development seems to be frozen. We're providing some bug fixes along with deployments to maven.

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package de.intarsys.pdf.content.common;

import de.intarsys.pdf.cds.CDSMatrix;
import de.intarsys.pdf.cds.CDSRectangle;
import de.intarsys.pdf.content.CSContent;
import de.intarsys.pdf.content.CSDeviceBasedInterpreter;
import de.intarsys.pdf.content.CSError;
import de.intarsys.pdf.content.CSWarning;
import de.intarsys.pdf.content.ICSExceptionHandler;
import de.intarsys.pdf.cos.COSObject;
import de.intarsys.pdf.pd.PDForm;
import de.intarsys.pdf.pd.PDPage;
import de.intarsys.pdf.pd.PDResources;

import java.awt.geom.Rectangle2D;

/**
 * A collection of tools to work with page content.
 */
public class CSContentTools {

    private static final ICSExceptionHandler ignoreExceptionHandler = new ICSExceptionHandler() {

        @Override
        public void error(CSError error) {
            // ignore
        }

        @Override
        public void warning(CSWarning warning) {
            // ignore
        }
    };

    private CSContentTools() {
    }

    /**
     * Get the rectangle containing all graphics artifacts on the page (stemming
     * from the content stream).
     *
     * @param page   The page whose content is evaluated.
     * @param border A border width to be added to the clipping rectangle.
     * @return Get the rectangle containing all graphics artifacts on the page
     * (stemming from the content stream).
     */
    public static Rectangle2D getBoundingBoxClipped(PDPage page, double border) {
        CSBoundingBoxCollector bbCollector = new CSBoundingBoxCollector();
        CSDeviceBasedInterpreter interpreter = new CSDeviceBasedInterpreter(null, bbCollector);
        interpreter.setExceptionHandler(ignoreExceptionHandler);
        CSContent content = page.getContentStream();
        interpreter.process(content, page.getResources());
        if (bbCollector.getBoundingBox() != null) {
            return bbCollector.getBoundingBox();
        } else {
            return page.getCropBox().toNormalizedRectangle();
        }
    }

    /**
     * Get a {@link PDForm} containing all graphics artifacts on the page
     * (stemming from the content stream).
     *
     * @param page   The page whose content is evaluated.
     * @param border A border width to be added to the clipping rectangle.
     * @return Get a {@link PDForm} containing all graphics artifacts on the
     * page (stemming from the content stream).
     */
    public static PDForm getFormClipped(PDPage page, double border) {
        PDForm form = (PDForm) PDForm.META.createNew();
        CSContent content = page.getContentStream();
        if (content == null) {
            form.setBytes(new byte[0]);
        } else {
            form.setBytes(content.toByteArray());
        }
        if (page.getResources() != null) {
            COSObject cosResources = page.getResources().cosGetObject().copyDeep();
            PDResources resources = (PDResources) PDResources.META.createFromCos(cosResources);
            form.setResources(resources);
        }
        Rectangle2D rect = CSContentTools.getBoundingBoxClipped(page, border);
        CDSRectangle bbox = new CDSRectangle(rect);
        form.setBoundingBox(bbox);
        CDSMatrix matrix = new CDSMatrix();
        matrix.translate(-bbox.getLowerLeftX(), -bbox.getLowerLeftY());
        // int rotation = PDFGeometryTools.normalizeRotation(page.getRotate());
        // if (rotation == 0) {
        // } else if (rotation == 90) {
        // matrix.rotate(Math.toRadians(-90));
        // } else if (rotation == 180) {
        // matrix.rotate(Math.toRadians(-180));
        // } else if (rotation == 270) {
        // matrix.rotate(Math.toRadians(-270));
        // } else {
        // }
        form.setMatrix(matrix);
        return form;
    }
}