/*
* @(#)RenderableImageProducer.java 1.11 03/12/19
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
/* ********************************************************************
**********************************************************************
**********************************************************************
*** COPYRIGHT (c) Eastman Kodak Company, 1997 ***
*** As an unpublished work pursuant to Title 17 of the United ***
*** States Code. All rights reserved. ***
**********************************************************************
**********************************************************************
**********************************************************************/
package java.awt.image.renderable;
import java.awt.color.ColorSpace;
import java.awt.image.ColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.DirectColorModel;
import java.awt.image.ImageConsumer;
import java.awt.image.ImageProducer;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.awt.image.SampleModel;
import java.util.Enumeration;
import java.util.Vector;
/**
* An adapter class that implements ImageProducer to allow the
* asynchronous production of a RenderableImage. The size of the
* ImageConsumer is determined by the scale factor of the usr2dev
* transform in the RenderContext. If the RenderContext is null, the
* default rendering of the RenderableImage is used. This class
* implements an asynchronous production that produces the image in
* one thread at one resolution. This class may be subclassed to
* implement versions that will render the image using several
* threads. These threads could render either the same image at
* progressively better quality, or different sections of the image at
* a single resolution.
*/
public class RenderableImageProducer implements ImageProducer, Runnable {
/** The RenderableImage source for the producer. */
RenderableImage rdblImage;
/** The RenderContext to use for producing the image. */
RenderContext rc;
/** A Vector of image consumers. */
Vector ics = new Vector();
/**
* Constructs a new RenderableImageProducer from a RenderableImage
* and a RenderContext.
*
* @param rdblImage the RenderableImage to be rendered.
* @param rc the RenderContext to use for producing the pixels.
*/
public RenderableImageProducer(RenderableImage rdblImage,
RenderContext rc) {
this.rdblImage = rdblImage;
this.rc = rc;
}
/**
* Sets a new RenderContext to use for the next startProduction() call.
*
* @param rc the new RenderContext.
*/
public synchronized void setRenderContext(RenderContext rc) {
this.rc = rc;
}
/**
* Adds an ImageConsumer to the list of consumers interested in
* data for this image.
*
* @param ic an ImageConsumer to be added to the interest list.
*/
public synchronized void addConsumer(ImageConsumer ic) {
if (!ics.contains(ic)) {
ics.addElement(ic);
}
}
/**
* Determine if an ImageConsumer is on the list of consumers
* currently interested in data for this image.
*
* @param ic the ImageConsumer to be checked.
* @return true if the ImageConsumer is on the list; false otherwise.
*/
public synchronized boolean isConsumer(ImageConsumer ic) {
return ics.contains(ic);
}
/**
* Remove an ImageConsumer from the list of consumers interested in
* data for this image.
*
* @param ic the ImageConsumer to be removed.
*/
public synchronized void removeConsumer(ImageConsumer ic) {
ics.removeElement(ic);
}
/**
* Adds an ImageConsumer to the list of consumers interested in
* data for this image, and immediately starts delivery of the
* image data through the ImageConsumer interface.
*
* @param ic the ImageConsumer to be added to the list of consumers.
*/
public synchronized void startProduction(ImageConsumer ic) {
addConsumer(ic);
// Need to build a runnable object for the Thread.
Thread thread = new Thread(this, "RenderableImageProducer Thread");
thread.start();
}
/**
* Requests that a given ImageConsumer have the image data delivered
* one more time in top-down, left-right order.
*
* @param ic the ImageConsumer requesting the resend.
*/
public void requestTopDownLeftRightResend(ImageConsumer ic) {
// So far, all pixels are already sent in TDLR order
}
/**
* The runnable method for this class. This will produce an image using
* the current RenderableImage and RenderContext and send it to all the
* ImageConsumer currently registered with this class.
*/
public void run() {
// First get the rendered image
RenderedImage rdrdImage;
if (rc != null) {
rdrdImage = rdblImage.createRendering(rc);
} else {
rdrdImage = rdblImage.createDefaultRendering();
}
// And its ColorModel
ColorModel colorModel = rdrdImage.getColorModel();
Raster raster = rdrdImage.getData();
SampleModel sampleModel = raster.getSampleModel();
DataBuffer dataBuffer = raster.getDataBuffer();
if (colorModel == null) {
colorModel = ColorModel.getRGBdefault();
}
int minX = raster.getMinX();
int minY = raster.getMinY();
int width = raster.getWidth();
int height = raster.getHeight();
Enumeration icList;
ImageConsumer ic;
// Set up the ImageConsumers
icList = ics.elements();
while (icList.hasMoreElements()) {
ic = (ImageConsumer)icList.nextElement();
ic.setDimensions(width,height);
ic.setHints(ImageConsumer.TOPDOWNLEFTRIGHT |
ImageConsumer.COMPLETESCANLINES |
ImageConsumer.SINGLEPASS |
ImageConsumer.SINGLEFRAME);
}
// Get RGB pixels from the raster scanline by scanline and
// send to consumers.
int pix[] = new int[width];
int i,j;
int numBands = sampleModel.getNumBands();
int tmpPixel[] = new int[numBands];
for (j = 0; j < height; j++) {
for(i = 0; i < width; i++) {
sampleModel.getPixel(i, j, tmpPixel, dataBuffer);
pix[i] = colorModel.getDataElement(tmpPixel, 0);
}
// Now send the scanline to the Consumers
icList = ics.elements();
while (icList.hasMoreElements()) {
ic = (ImageConsumer)icList.nextElement();
ic.setPixels(0, j, width, 1, colorModel, pix, 0, width);
}
}
// Now tell the consumers we're done.
icList = ics.elements();
while (icList.hasMoreElements()) {
ic = (ImageConsumer)icList.nextElement();
ic.imageComplete(ImageConsumer.STATICIMAGEDONE);
}
}
}
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