SampleAWTRenderer.java Source code

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Here is the source code for SampleAWTRenderer.java

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/*
 * @(#)SampleAWTRenderer.java   1.3 01/03/13
 *
 * Copyright (c) 1999-2001 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) Licensee does not utilize the software in a manner
 * which is disparaging to Sun.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
 * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 * the design, construction, operation or maintenance of any nuclear
 * facility. Licensee represents and warrants that it will not use or
 * redistribute the Software for such purposes.
 */

import javax.media.*;
import javax.media.renderer.VideoRenderer;
import javax.media.Format;
import javax.media.format.VideoFormat;
import javax.media.format.RGBFormat;

import java.awt.*;
import java.awt.image.*;
import java.awt.color.ColorSpace;
import java.awt.event.*;
import java.util.Vector;

/**
 * Renderer for RGB images using AWT Image.
 */
public class SampleAWTRenderer implements javax.media.renderer.VideoRenderer {

    /*************************************************************************
     * Variables and Constants
     *************************************************************************/

    // The descriptive name of this renderer
    private static final String name = "Sample AWT Renderer";

    protected RGBFormat inputFormat;

    protected RGBFormat supportedRGB;

    protected Format[] supportedFormats;

    protected MemoryImageSource sourceImage;

    protected Image destImage;

    protected Buffer lastBuffer = null;

    protected int inWidth = 0;

    protected int inHeight = 0;

    protected Component component = null;

    protected Rectangle reqBounds = null;

    protected Rectangle bounds = new Rectangle();

    protected boolean started = false;

    /*************************************************************************
     * Constructor
     *************************************************************************/

    public SampleAWTRenderer() {
        // Prepare supported input formats and preferred format
        int rMask = 0x000000FF;
        int gMask = 0x0000FF00;
        int bMask = 0x00FF0000;

        supportedRGB = new RGBFormat(null, // size
                Format.NOT_SPECIFIED, // maxDataLength
                int[].class, // buffer type
                Format.NOT_SPECIFIED, // frame rate
                32, // bitsPerPixel
                rMask, gMask, bMask, // component masks
                1, // pixel stride
                Format.NOT_SPECIFIED, // line stride
                Format.FALSE, // flipped
                Format.NOT_SPECIFIED // endian
        );
        supportedFormats = new VideoFormat[1];
        supportedFormats[0] = supportedRGB;
    }

    /****************************************************************
     * Controls implementation
     ****************************************************************/

    /**
     * Returns an array of supported controls
     **/
    public Object[] getControls() {
        // No controls
        return (Object[]) new Control[0];
    }

    /**
     * Return the control based on a control type for the PlugIn.
     */
    public Object getControl(String controlType) {
        try {
            Class cls = Class.forName(controlType);
            Object cs[] = getControls();
            for (int i = 0; i < cs.length; i++) {
                if (cls.isInstance(cs[i]))
                    return cs[i];
            }
            return null;
        } catch (Exception e) { // no such controlType or such control
            return null;
        }
    }

    /*************************************************************************
     * PlugIn implementation
     *************************************************************************/

    public String getName() {
        return name;
    }

    /**
     * Opens the plugin
     */
    public void open() throws ResourceUnavailableException {
        sourceImage = null;
        destImage = null;
        lastBuffer = null;
    }

    /**
     * Resets the state of the plug-in. Typically at end of media or when media
     * is repositioned.
     */
    public void reset() {
        // Nothing to do
    }

    public void close() {
        // Nothing to do
    }

    /*************************************************************************
     * Renderer implementation
     *************************************************************************/

    public void start() {
        started = true;
    }

    public void stop() {
        started = false;
    }

    /**
     * Lists the possible input formats supported by this plug-in.
     */
    public Format[] getSupportedInputFormats() {
        return supportedFormats;
    }

    /**
     * Set the data input format.
     */
    public Format setInputFormat(Format format) {
        if (format != null && format instanceof RGBFormat && format.matches(supportedRGB)) {

            inputFormat = (RGBFormat) format;
            Dimension size = inputFormat.getSize();
            inWidth = size.width;
            inHeight = size.height;
            return format;
        } else
            return null;
    }

    /**
     * Processes the data and renders it to a component
     */
    public synchronized int process(Buffer buffer) {
        if (component == null)
            return BUFFER_PROCESSED_FAILED;

        Format inf = buffer.getFormat();
        if (inf == null)
            return BUFFER_PROCESSED_FAILED;

        if (inf != inputFormat || !buffer.getFormat().equals(inputFormat)) {
            if (setInputFormat(inf) != null)
                return BUFFER_PROCESSED_FAILED;
        }

        Object data = buffer.getData();
        if (!(data instanceof int[]))
            return BUFFER_PROCESSED_FAILED;

        if (lastBuffer != buffer) {
            lastBuffer = buffer;
            newImage(buffer);
        }

        sourceImage.newPixels(0, 0, inWidth, inHeight);

        Graphics g = component.getGraphics();
        if (g != null) {
            if (reqBounds == null) {
                bounds = component.getBounds();
                bounds.x = 0;
                bounds.y = 0;
            } else
                bounds = reqBounds;
            g.drawImage(destImage, bounds.x, bounds.y, bounds.width, bounds.height, 0, 0, inWidth, inHeight,
                    component);
        }

        return BUFFER_PROCESSED_OK;
    }

    /****************************************************************
     * VideoRenderer implementation
     ****************************************************************/

    /**
     * Returns an AWT component that it will render to. Returns null
     * if it is not rendering to an AWT component.
     */
    public java.awt.Component getComponent() {
        if (component == null) {
            component = new Canvas() {
                public Dimension getPreferredSize() {
                    return new Dimension(getInWidth(), getInHeight());
                }

                public void update(Graphics g) {
                }

                public void paint(Graphics g) {
                    // TODO: Need to repaint image if the movie is in paused state
                }

            };
        }

        return component;
    }

    /**
     * Requests the renderer to draw into a specified AWT component.
     * Returns false if the renderer cannot draw into the specified
     * component.
     */
    public boolean setComponent(java.awt.Component comp) {
        component = comp;
        return true;
    }

    /**
     * Sets the region in the component where the video is to be
     * rendered to. Video is to be scaled if necessary. If <code>rect</code>
     * is null, then the video occupies the entire component.
     */
    public void setBounds(java.awt.Rectangle rect) {
        reqBounds = rect;
    }

    /**
     * Returns the region in the component where the video will be
     * rendered to. Returns null if the entire component is being used.
     */
    public java.awt.Rectangle getBounds() {
        return reqBounds;
    }

    /*************************************************************************
     * Local methods
     *************************************************************************/

    int getInWidth() {
        return inWidth;
    }

    int getInHeight() {
        return inHeight;
    }

    private void newImage(Buffer buffer) {

        if (!(buffer.getData() instanceof int[]))
            return;

        int[] data = (int[]) buffer.getData();
        RGBFormat format = (RGBFormat) buffer.getFormat();

        //data = processImage(buffer);
        data = (int[]) buffer.getData();

        DirectColorModel dcm = new DirectColorModel(format.getBitsPerPixel(), format.getRedMask(),
                format.getGreenMask(), format.getBlueMask());

        sourceImage = new MemoryImageSource(format.getLineStride(), format.getSize().height, dcm, (int[]) data, 0,
                format.getLineStride());
        sourceImage.setAnimated(true);
        sourceImage.setFullBufferUpdates(true);
        if (component != null) {
            destImage = component.createImage(sourceImage);
            component.prepareImage(destImage, component);
        }
    }

    private int[] processImage(Buffer buf) {
        int[] data = (int[]) buf.getData();
        int[] ret = new int[data.length];
        RGBFormat fmt = (RGBFormat) buf.getFormat();

        DirectColorModel dcm = new DirectColorModel(fmt.getBitsPerPixel(), fmt.getRedMask(), fmt.getGreenMask(),
                fmt.getBlueMask());
        int[] rgb;
        int k;
        for (int i = 0; i < data.length; i++) {
            rgb = dcm.getComponents(data[i], null, 0);
            k = toGray(rgb);
            rgb[0] = rgb[1] = rgb[2] = k;
            ret[i] = dcm.getDataElement(rgb, 0);
        }
        return ret;
    }

    private int toGray(int[] rgb) {
        return (int) (0.2125 * rgb[0] + 0.7154 * rgb[1] + 0.0721 * rgb[2]);
    }

}