Java BufferedImage Pixel extractFromPixeldata(short[] pixeldata, int columns, int stride, int mask, byte[] ovlyData, int off, int length)

Description

extract From Pixeldata

License

Open Source License

Declaration

private static void extractFromPixeldata(short[] pixeldata, int columns, int stride, int mask, byte[] ovlyData,
            int off, int length) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2016 Weasis Team and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors://from w  w  w . j av a  2  s .  com
 *     Nicolas Roduit - initial API and implementation
 *******************************************************************************/

import java.awt.image.ComponentSampleModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.DataBufferShort;
import java.awt.image.DataBufferUShort;

import java.awt.image.Raster;

public class Main {
    public static void extractFromPixeldata(Raster raster, int mask, byte[] ovlyData, int off, int length) {
        ComponentSampleModel sm = (ComponentSampleModel) raster.getSampleModel();
        int columns = raster.getWidth();
        int stride = sm.getScanlineStride();
        DataBuffer db = raster.getDataBuffer();
        switch (db.getDataType()) {
        case DataBuffer.TYPE_BYTE:
            extractFromPixeldata(((DataBufferByte) db).getData(), columns, stride, mask, ovlyData, off, length);
            break;
        case DataBuffer.TYPE_USHORT:
            extractFromPixeldata(((DataBufferUShort) db).getData(), columns, stride, mask, ovlyData, off, length);
            break;
        case DataBuffer.TYPE_SHORT:
            extractFromPixeldata(((DataBufferShort) db).getData(), columns, stride, mask, ovlyData, off, length);
            break;
        default:
            throw new UnsupportedOperationException("Unsupported DataBuffer type: " + db.getDataType()); //$NON-NLS-1$
        }
    }

    private static void extractFromPixeldata(byte[] pixeldata, int columns, int stride, int mask, byte[] ovlyData,
            int off, int length) {
        for (int y = 0, i = off, imax = off + length; y < columns && i < imax; y++) {
            for (int j = y * stride; j < imax && i < imax; j++, i++) {
                if ((pixeldata[j] & mask) != 0) {
                    ovlyData[i >>> 3] |= 1 << (i & 7);
                }
            }
        }
    }

    private static void extractFromPixeldata(short[] pixeldata, int columns, int stride, int mask, byte[] ovlyData,
            int off, int length) {
        for (int y = 0, i = off, imax = off + length; y < columns && i < imax; y++) {
            for (int j = y * stride; j < imax && i < imax; j++, i++) {
                if ((pixeldata[j] & mask) != 0) {
                    ovlyData[i >>> 3] |= 1 << (i & 7);
                }
            }
        }
    }
}

Related

1. getRandomPixel(final String fileName)
2. imageFromIntArray(int[] pixels, int w, int h)
3. pixels(BufferedImage image)
4. pixelsb(BufferedImage image)