Renderer for RGB images using AWT Image using Java Media API
/*
* @(#)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
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*
* 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]);
}
}
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