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An Open Source JavaFX PDF Viewer
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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
*
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


*
* ---------------
* IndexedImage.java
* ---------------
*/

package org.jpedal.parser.image;

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.awt.image.Raster;

import org.jpedal.color.ColorSpaces;
import org.jpedal.color.GenericColorSpace;
import org.jpedal.io.ColorSpaceConvertor;
import org.jpedal.utils.LogWriter;

/**
 * @author markee
 */
public class IndexedImage {


    public static BufferedImage make(final int w, final int h, final GenericColorSpace decodeColorData, byte[] index, final int d, final byte[] data) {


        BufferedImage image = null;

        LogWriter.writeLog("Indexed " + w + ' ' + h);


        if (!decodeColorData.isIndexConverted()) {
            index = decodeColorData.convertIndexToRGB(index);
        }

        //workout size and check in range

        //pick out daft setting of totally empty image and ignore
        if (d == 8 && decodeColorData.getIndexSize() == 0 &&
                decodeColorData.getID() == ColorSpaces.DeviceRGB
                && decodeColorData.getRawColorSpacePDFType() != ColorSpaces.ICC) {

            boolean hasPixels = false;

            final int indexCount = index.length;
            for (int ii = 0; ii < indexCount; ii++) {
                if (index[ii] != 0) {
                    hasPixels = true;
                    ii = indexCount;
                }
            }

            if (!hasPixels) {
                final int pixelCount = data.length;

                for (int ii = 0; ii < pixelCount; ii++) {
                    if (data[ii] != 0) {
                        hasPixels = true;
                        ii = pixelCount;
                    }
                }
            }
            if (!hasPixels) {
                return new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB);
            }
        }

        try {
            //remove image in Itext which is white on white
            if (d == 1 && index.length == 6 && index[0] == index[3] && index[1] == index[4] && index[2] == index[5]) {
                image = null;
                //optimise  silly Itext case of 1=1 white indexed image  11dec/gattest.pdf
            } else if (d == 8 && w == 1 && h == 1 && index[0] == -1 && index[1] == -1 && index[2] == -1 && allBytesZero(data)) {
                image = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB);
                image.createGraphics().setPaint(Color.CYAN);
                final Raster raster = ColorSpaceConvertor.createInterleavedRaster((new byte[]{(byte) 255, (byte) 255, (byte) 255}), 1, 1);
                image.setData(raster);

            } else {
                image = ColorSpaceConvertor.convertIndexedToFlat(d, w, h, data, index, false, false);
            }
        } catch (final Exception e) {
            LogWriter.writeLog("Exception: " + e.getMessage());
        }
        return image;
    }

    private static boolean allBytesZero(final byte[] data) {

        boolean allZero = true;

        for (final byte bytes : data) {
            if (bytes != 0) {
                allZero = false;
                break;
            }
        }
        return allZero;
    }

}