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Open Source (LGPL) JavaFX PDF Viewer for NetBeans plugin
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/*
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.idrsolutions.com
 * Help section for developers at http://www.idrsolutions.com/support/
 *
 * (C) Copyright 1997-2017 IDRsolutions and Contributors.
 *
 * This file is part of JPedal/JPDF2HTML5
 *
 @LICENSE@
 *
 * ---------------
 * PdfStreamDecoderForSampling.java
 * ---------------
 */

package org.jpedal.parser;

import org.jpedal.external.ExternalHandlers;
import org.jpedal.io.PdfObjectReader;
import org.jpedal.objects.GraphicsState;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;

public class PdfStreamDecoderForSampling extends PdfStreamDecoder {

    PdfStreamDecoderForSampling(final PdfObjectReader currentPdfFile) {

        super(currentPdfFile);

    }

    /**
     * just scan for DO and CM to get image sizes so we can work out sampling used
     */
    public final float decodePageContentForImageSampling(final PdfObject pdfObject) { /* take out min's%%*/

        try {

            parserOptions.setRenderDirectly(true);

            //check switched off
            parserOptions.imagesProcessedFully = true;

            //reset count
            imageCount = 0;


            gs = new GraphicsState(0, 0); /* take out min's%%*/

            //get the binary data from the file
            final byte[] b_data;

            byte[][] pageContents = null;
            if (pdfObject != null) {
                pageContents = pdfObject.getKeyArray(PdfDictionary.Contents);
                isDataValid = pdfObject.streamMayBeCorrupt();
            }

            if (pdfObject != null && pageContents == null) {
                b_data = currentPdfFile.readStream(pdfObject, true, true, false, false, false, pdfObject.getCacheName(currentPdfFile.getObjectReader()));
            } else if (pageStream != null) {
                b_data = pageStream;
            } else {
                b_data = currentPdfFile.getObjectReader().readPageIntoStream(pdfObject);
            }

            //if page data found, turn it into a set of commands
            //and decode the stream of commands
            if (b_data != null && b_data.length > 0) {
                getSamplingOnly = true;
                decodeStreamIntoObjects(b_data, false);
            }

            //flush fonts
            cache.resetFonts();

            return parserOptions.getSamplingUsed();

        } catch (final Error err) {
            errorTracker.addPageFailureMessage("Problem decoding page " + err);
            if (ExternalHandlers.throwMissingCIDError && err.getMessage() != null && err.getMessage().contains("kochi")) {
                throw err;
            }
        }

        return -1;
    }

}