interactivespaces.service.image.vision.opencv.swing.OpenCvMatPanel.java Source code

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Here is the source code for interactivespaces.service.image.vision.opencv.swing.OpenCvMatPanel.java

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/*
 * Copyright (C) 2013 Google Inc.
 *
 * Licensed 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 interactivespaces.service.image.vision.opencv.swing;

import interactivespaces.service.image.vision.opencv.MatUtils;

import org.apache.commons.logging.Log;
import org.opencv.core.Mat;

import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.concurrent.ExecutionException;

import javax.swing.JPanel;
import javax.swing.SwingWorker;

/**
 * A Swing JPanel which can display OpenCV Mat images.
 *
 * @author Keith M. Hughes
 */
public class OpenCvMatPanel extends JPanel {

    /**
     * The Swing image to paint.
     */
    private BufferedImage image;

    /**
     * {@code true} if the image should be released after it is drawn.
     */
    private final boolean releaseAfterDraw;

    /**
     * Logger for the panel.
     */
    private final Log log;

    /**
     * Construct a new panel.
     *
     * <p>
     * The image will be released after it is drawn.
     *
     * @param log
     *          logger for the panel
     */
    public OpenCvMatPanel(Log log) {
        this(log, true);
    }

    /**
     * Construct a new panel.
     *
     * @param log
     *          logger for the panel
     * @param releaseAfterDraw
     *          {@code true} if the Mat should be released after it is drawn
     */
    public OpenCvMatPanel(Log log, boolean releaseAfterDraw) {
        this.log = log;
        this.releaseAfterDraw = releaseAfterDraw;
    }

    @Override
    public void paintComponent(Graphics g) {
        if (image != null) {
            g.drawImage(image, 0, 0, image.getWidth(), image.getHeight(), this);
        }
    }

    /**
     * Draw an OpenCV image in the panel.
     *
     * @param opencvImage
     *          the image to draw
     */
    public void drawImage(final Mat opencvImage) {
        SwingWorker<BufferedImage, Void> worker = new SwingWorker<BufferedImage, Void>() {

            @Override
            protected BufferedImage doInBackground() throws Exception {
                return MatUtils.matToBufferedImage(opencvImage);
            }

            @Override
            protected void done() {
                try {
                    image = get();

                    repaint();

                    if (releaseAfterDraw) {
                        opencvImage.release();
                    }
                } catch (InterruptedException e) {
                    log.info("Swing worker for rendering Mat images interrupted");
                } catch (ExecutionException e) {
                    log.error("Error during Swing worker for rendering Mat images", e);
                }
            }
        };

        worker.execute();
    }
}