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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.awt.image 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   java.awt.image.MemoryImageSource

All known Subclasses:   sun.porting.utils.BitmapImageSource,
MemoryImageSource
public class MemoryImageSource implements ImageProducer(Code)
This class is an implementation of the ImageProducer interface which uses an array to produce pixel values for an Image. Here is an example which calculates a 100x100 image representing a fade from black to blue along the X axis and a fade from black to red along the Y axis:
 int w = 100;
 int h = 100;
 int pix[] = new int[w * h];
 int index = 0;
 for (int y = 0; y < h; y++) {
 int red = (y * 255) / (h - 1);
 for (int x = 0; x < w; x++) {
 int blue = (x * 255) / (w - 1);
 pix[index++] = (255 << 24) | (red << 16) | blue;
 }
 }
 Image img = createImage(new MemoryImageSource(w, h, pix, 0, w));
 
The MemoryImageSource is also capable of managing a memory image which varies over time to allow animation or custom rendering. Here is an example showing how to set up the animation source and signal changes in the data (adapted from the MemoryAnimationSourceDemo by Garth Dickie):
 int pixels[];
 MemoryImageSource source;
 public void init() {
 int width = 50;
 int height = 50;
 int size = width * height;
 pixels = new int[size];
 int value = getBackground().getRGB();
 for (int i = 0; i < size; i++) {
 pixels[i] = value;
 }
 source = new MemoryImageSource(width, height, pixels, 0, width);
 source.setAnimated(true);
 image = createImage(source);
 }
 public void run() {
 Thread me = Thread.currentThread( );
 me.setPriority(Thread.MIN_PRIORITY);
 while (true) {
 try {
 thread.sleep(10);
 } catch( InterruptedException e ) {
 return;
 }
 // Modify the values in the pixels array at (x, y, w, h)
 // Send the new data to the interested ImageConsumers
 source.newPixels(x, y, w, h);
 }
 }
 

See Also:   ImageProducer
version:
   1.23 08/19/02
author:
   Jim Graham
author:
   Animation capabilities inspired by the
author:
   MemoryAnimationSource class written by Garth Dickie


Field Summary
 booleananimating
    
 booleanfullbuffers
    
 intheight
    
 ColorModelmodel
    
 intpixeloffset
    
 Objectpixels
    
 intpixelscan
    
 Hashtableproperties
    
 VectortheConsumers
    
 intwidth
    

Constructor Summary
public  MemoryImageSource(int w, int h, ColorModel cm, byte[] pix, int off, int scan)
     Constructs an ImageProducer object which uses an array of bytes to produce data for an Image object.
public  MemoryImageSource(int w, int h, ColorModel cm, byte[] pix, int off, int scan, Hashtable props)
     Constructs an ImageProducer object which uses an array of bytes to produce data for an Image object.
public  MemoryImageSource(int w, int h, ColorModel cm, int[] pix, int off, int scan)
     Constructs an ImageProducer object which uses an array of integers to produce data for an Image object.
public  MemoryImageSource(int w, int h, ColorModel cm, int[] pix, int off, int scan, Hashtable props)
     Constructs an ImageProducer object which uses an array of integers to produce data for an Image object.
public  MemoryImageSource(int w, int h, int pix, int off, int scan)
     Constructs an ImageProducer object which uses an array of integers in the default RGB ColorModel to produce data for an Image object.
public  MemoryImageSource(int w, int h, int pix, int off, int scan, Hashtable props)
     Constructs an ImageProducer object which uses an array of integers in the default RGB ColorModel to produce data for an Image object.

Method Summary
public synchronized  voidaddConsumer(ImageConsumer ic)
     Adds an ImageConsumer to the list of consumers interested in data for this image.
public synchronized  booleanisConsumer(ImageConsumer ic)
     Determine if an ImageConsumer is on the list of consumers currently interested in data for this image.
public  voidnewPixels()
     Send a whole new buffer of pixels to any ImageConsumers that are currently interested in the data for this image and notify them that an animation frame is complete.
public synchronized  voidnewPixels(int x, int y, int w, int h)
     Send a rectangular region of the buffer of pixels to any ImageConsumers that are currently interested in the data for this image and notify them that an animation frame is complete.
public synchronized  voidnewPixels(int x, int y, int w, int h, boolean framenotify)
     Send a rectangular region of the buffer of pixels to any ImageConsumers that are currently interested in the data for this image.
public synchronized  voidnewPixels(byte[] newpix, ColorModel newmodel, int offset, int scansize)
     Change to a new byte array to hold the pixels for this image.
public synchronized  voidnewPixels(int[] newpix, ColorModel newmodel, int offset, int scansize)
     Change to a new int array to hold the pixels for this image.
public synchronized  voidremoveConsumer(ImageConsumer ic)
     Remove an ImageConsumer from the list of consumers interested in data for this image.
public  voidrequestTopDownLeftRightResend(ImageConsumer ic)
     Requests that a given ImageConsumer have the image data delivered one more time in top-down, left-right order.
public synchronized  voidsetAnimated(boolean animated)
     Change this memory image into a multi-frame animation or a single-frame static image depending on the animated parameter.

This method should be called immediately after the MemoryImageSource is constructed and before an image is created with it to ensure that all ImageConsumers will receive the correct multi-frame data.

public synchronized  voidsetFullBufferUpdates(boolean fullbuffers)
     Specify whether this animated memory image should always be updated by sending the complete buffer of pixels whenever there is a change.
public  voidstartProduction(ImageConsumer ic)
     Adds an ImageConsumer to the list of consumers interested in data for this image, and immediately start delivery of the image data through the ImageConsumer interface.

Field Detail
animating
boolean animating(Code)



fullbuffers
boolean fullbuffers(Code)



height
int height(Code)



model
ColorModel model(Code)



pixeloffset
int pixeloffset(Code)



pixels
Object pixels(Code)



pixelscan
int pixelscan(Code)



properties
Hashtable properties(Code)



theConsumers
Vector theConsumers(Code)



width
int width(Code)




Constructor Detail
MemoryImageSource
public MemoryImageSource(int w, int h, ColorModel cm, byte[] pix, int off, int scan)(Code)
Constructs an ImageProducer object which uses an array of bytes to produce data for an Image object.
See Also:   java.awt.Component.createImage



MemoryImageSource
public MemoryImageSource(int w, int h, ColorModel cm, byte[] pix, int off, int scan, Hashtable props)(Code)
Constructs an ImageProducer object which uses an array of bytes to produce data for an Image object.
See Also:   java.awt.Component.createImage



MemoryImageSource
public MemoryImageSource(int w, int h, ColorModel cm, int[] pix, int off, int scan)(Code)
Constructs an ImageProducer object which uses an array of integers to produce data for an Image object.
See Also:   java.awt.Component.createImage



MemoryImageSource
public MemoryImageSource(int w, int h, ColorModel cm, int[] pix, int off, int scan, Hashtable props)(Code)
Constructs an ImageProducer object which uses an array of integers to produce data for an Image object.
See Also:   java.awt.Component.createImage



MemoryImageSource
public MemoryImageSource(int w, int h, int pix, int off, int scan)(Code)
Constructs an ImageProducer object which uses an array of integers in the default RGB ColorModel to produce data for an Image object.
See Also:   java.awt.Component.createImage
See Also:   ColorModel.getRGBdefault



MemoryImageSource
public MemoryImageSource(int w, int h, int pix, int off, int scan, Hashtable props)(Code)
Constructs an ImageProducer object which uses an array of integers in the default RGB ColorModel to produce data for an Image object.
See Also:   java.awt.Component.createImage
See Also:   ColorModel.getRGBdefault




Method Detail
addConsumer
public synchronized void addConsumer(ImageConsumer ic)(Code)
Adds an ImageConsumer to the list of consumers interested in data for this image.
See Also:   ImageConsumer



isConsumer
public synchronized boolean isConsumer(ImageConsumer ic)(Code)
Determine if an ImageConsumer is on the list of consumers currently interested in data for this image. true if the ImageConsumer is on the list; false otherwise
See Also:   ImageConsumer



newPixels
public void newPixels()(Code)
Send a whole new buffer of pixels to any ImageConsumers that are currently interested in the data for this image and notify them that an animation frame is complete. This method only has effect if the animation flag has been turned on through the setAnimated() method.
See Also:   ImageConsumer
See Also:   MemoryImageSource.setAnimated



newPixels
public synchronized void newPixels(int x, int y, int w, int h)(Code)
Send a rectangular region of the buffer of pixels to any ImageConsumers that are currently interested in the data for this image and notify them that an animation frame is complete. This method only has effect if the animation flag has been turned on through the setAnimated() method. If the full buffer update flag was turned on with the setFullBufferUpdates() method then the rectangle parameters will be ignored and the entire buffer will always be sent.
Parameters:
  x - the x coordinate of the upper left corner of the rectangleof pixels to be sent
Parameters:
  y - the y coordinate of the upper left corner of the rectangleof pixels to be sent
Parameters:
  w - the width of the rectangle of pixels to be sent
Parameters:
  h - the height of the rectangle of pixels to be sent
See Also:   ImageConsumer
See Also:   MemoryImageSource.setAnimated
See Also:   MemoryImageSource.setFullBufferUpdates



newPixels
public synchronized void newPixels(int x, int y, int w, int h, boolean framenotify)(Code)
Send a rectangular region of the buffer of pixels to any ImageConsumers that are currently interested in the data for this image. If the framenotify parameter is true then the consumers are also notified that an animation frame is complete. This method only has effect if the animation flag has been turned on through the setAnimated() method. If the full buffer update flag was turned on with the setFullBufferUpdates() method then the rectangle parameters will be ignored and the entire buffer will always be sent.
Parameters:
  x - the x coordinate of the upper left corner of the rectangleof pixels to be sent
Parameters:
  y - the y coordinate of the upper left corner of the rectangleof pixels to be sent
Parameters:
  w - the width of the rectangle of pixels to be sent
Parameters:
  h - the height of the rectangle of pixels to be sent
Parameters:
  framenotify - true if the consumers should be sent aSINGLEFRAMEDONE notification
See Also:   ImageConsumer
See Also:   MemoryImageSource.setAnimated
See Also:   MemoryImageSource.setFullBufferUpdates



newPixels
public synchronized void newPixels(byte[] newpix, ColorModel newmodel, int offset, int scansize)(Code)
Change to a new byte array to hold the pixels for this image. If the animation flag has been turned on through the setAnimated() method, then the new pixels will be immediately delivered to any ImageConsumers that are currently interested in the data for this image.
See Also:   MemoryImageSource.setAnimated



newPixels
public synchronized void newPixels(int[] newpix, ColorModel newmodel, int offset, int scansize)(Code)
Change to a new int array to hold the pixels for this image. If the animation flag has been turned on through the setAnimated() method, then the new pixels will be immediately delivered to any ImageConsumers that are currently interested in the data for this image.
See Also:   MemoryImageSource.setAnimated



removeConsumer
public synchronized void removeConsumer(ImageConsumer ic)(Code)
Remove an ImageConsumer from the list of consumers interested in data for this image.
See Also:   ImageConsumer



requestTopDownLeftRightResend
public void requestTopDownLeftRightResend(ImageConsumer ic)(Code)
Requests that a given ImageConsumer have the image data delivered one more time in top-down, left-right order.
See Also:   ImageConsumer



setAnimated
public synchronized void setAnimated(boolean animated)(Code)
Change this memory image into a multi-frame animation or a single-frame static image depending on the animated parameter.

This method should be called immediately after the MemoryImageSource is constructed and before an image is created with it to ensure that all ImageConsumers will receive the correct multi-frame data. If an ImageConsumer is added to this ImageProducer before this flag is set then that ImageConsumer will see only a snapshot of the pixel data that was available when it connected.
Parameters:
  animated - true if the image is a multi-frame animation




setFullBufferUpdates
public synchronized void setFullBufferUpdates(boolean fullbuffers)(Code)
Specify whether this animated memory image should always be updated by sending the complete buffer of pixels whenever there is a change. This flag is ignored if the animation flag is not turned on through the setAnimated() method.

This method should be called immediately after the MemoryImageSource is constructed and before an image is created with it to ensure that all ImageConsumers will receive the correct pixel delivery hints.
Parameters:
  fullbuffers - true if the complete pixel buffer should alwaysbe sent
See Also:   MemoryImageSource.setAnimated




startProduction
public void startProduction(ImageConsumer ic)(Code)
Adds an ImageConsumer to the list of consumers interested in data for this image, and immediately start delivery of the image data through the ImageConsumer interface.
See Also:   ImageConsumer



Methods inherited from java.lang.Object
public boolean equals(Object obj)(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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