java.awt.image

Class MemoryImageSource

java.lang.Object

java.awt.image.MemoryImageSource

All Implemented Interfaces:

ImageProducer

public class MemoryImageSource
extends Object
implements ImageProducer

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);
            }
        }

 

Version:

1.28 01/23/03

Author:

Jim Graham, Animation capabilities inspired by the MemoryAnimationSource class written by Garth Dickie

See Also:

ImageProducer

Constructor Summary

Constructors

Constructor and Description
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.
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.
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.
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.
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.
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

Methods

Modifier and Type	Method and Description
void	addConsumer(ImageConsumer ic) Adds an ImageConsumer to the list of consumers interested in data for this image.
boolean	isConsumer(ImageConsumer ic) Determines if an ImageConsumer is on the list of consumers currently interested in data for this image.
void	newPixels() Sends 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.
void	newPixels(byte[] newpix, ColorModel newmodel, int offset, int scansize) Changes to a new byte array to hold the pixels for this image.
void	newPixels(int[] newpix, ColorModel newmodel, int offset, int scansize) Changes to a new int array to hold the pixels for this image.
void	newPixels(int x, int y, int w, int h) Sends 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.
void	newPixels(int x, int y, int w, int h, boolean framenotify) Sends a rectangular region of the buffer of pixels to any ImageConsumers that are currently interested in the data for this image.
void	removeConsumer(ImageConsumer ic) Removes an ImageConsumer from the list of consumers interested in data for this image.
void	requestTopDownLeftRightResend(ImageConsumer ic) Requests that a given ImageConsumer have the image data delivered one more time in top-down, left-right order.
void	setAnimated(boolean animated) Changes this memory image into a multi-frame animation or a single-frame static image depending on the animated parameter.
void	setFullBufferUpdates(boolean fullbuffers) Specifies whether this animated memory image should always be updated by sending the complete buffer of pixels whenever there is a change.
void	startProduction(ImageConsumer 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.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MemoryImageSource

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.

Parameters:

w - the width of the rectangle of pixels

h - the height of the rectangle of pixels

cm - the specified ColorModel

pix - an array of pixels

off - the offset into the array of where to store the first pixel

scan - the distance from one row of pixels to the next in the array

See Also:

Component.createImage(java.awt.image.ImageProducer)

MemoryImageSource

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.

Parameters:

w - the width of the rectangle of pixels

h - the height of the rectangle of pixels

cm - the specified ColorModel

pix - an array of pixels

off - the offset into the array of where to store the first pixel

scan - the distance from one row of pixels to the next in the array

props - a list of properties that the ImageProducer uses to process an image

See Also:

Component.createImage(java.awt.image.ImageProducer)

MemoryImageSource

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.

Parameters:

w - the width of the rectangle of pixels

h - the height of the rectangle of pixels

cm - the specified ColorModel

pix - an array of pixels

off - the offset into the array of where to store the first pixel

scan - the distance from one row of pixels to the next in the array

See Also:

Component.createImage(java.awt.image.ImageProducer)

MemoryImageSource

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.

Parameters:

w - the width of the rectangle of pixels

h - the height of the rectangle of pixels

cm - the specified ColorModel

pix - an array of pixels

off - the offset into the array of where to store the first pixel

scan - the distance from one row of pixels to the next in the array

props - a list of properties that the ImageProducer uses to process an image

See Also:

Component.createImage(java.awt.image.ImageProducer)

MemoryImageSource

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.

Parameters:

w - the width of the rectangle of pixels

h - the height of the rectangle of pixels

pix - an array of pixels

off - the offset into the array of where to store the first pixel

scan - the distance from one row of pixels to the next in the array

See Also:

Component.createImage(java.awt.image.ImageProducer), ColorModel.getRGBdefault()

MemoryImageSource

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.

Parameters:

w - the width of the rectangle of pixels

h - the height of the rectangle of pixels

pix - an array of pixels

off - the offset into the array of where to store the first pixel

scan - the distance from one row of pixels to the next in the array

props - a list of properties that the ImageProducer uses to process an image

See Also:

Component.createImage(java.awt.image.ImageProducer), ColorModel.getRGBdefault()

Method Detail

addConsumer

public void addConsumer(ImageConsumer ic)

Adds an ImageConsumer to the list of consumers interested in data for this image.

Specified by:

addConsumer in interface ImageProducer

Parameters:

ic - the specified ImageConsumer

See Also:

ImageConsumer

isConsumer

public boolean isConsumer(ImageConsumer ic)

Determines if an ImageConsumer is on the list of consumers currently interested in data for this image.

Specified by:

isConsumer in interface ImageProducer

Parameters:

ic - the specified ImageConsumer

Returns:

true if the ImageConsumer is on the list; false otherwise.

See Also:

ImageConsumer

removeConsumer

public void removeConsumer(ImageConsumer ic)

Removes an ImageConsumer from the list of consumers interested in data for this image.

Specified by:

removeConsumer in interface ImageProducer

Parameters:

ic - the specified ImageConsumer

See Also:

ImageConsumer

startProduction

public void startProduction(ImageConsumer 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.

Specified by:

startProduction in interface ImageProducer

Parameters:

ic - the specified ImageConsumer image data through the ImageConsumer interface.

See Also:

ImageConsumer

requestTopDownLeftRightResend

public void requestTopDownLeftRightResend(ImageConsumer ic)

Requests that a given ImageConsumer have the image data delivered one more time in top-down, left-right order.

Specified by:

requestTopDownLeftRightResend in interface ImageProducer

Parameters:

ic - the specified ImageConsumer

See Also:

ImageConsumer

setAnimated

public void setAnimated(boolean animated)

Changes 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 void setFullBufferUpdates(boolean fullbuffers)

Specifies 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 always be sent

See Also:

setAnimated(boolean)

newPixels

public void newPixels()

Sends 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:

newPixels(int, int, int, int, boolean), ImageConsumer, setAnimated(boolean)

newPixels

public void newPixels(int x,
             int y,
             int w,
             int h)

Sends 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 rectangle of pixels to be sent

y - the y coordinate of the upper left corner of the rectangle of pixels to be sent

w - the width of the rectangle of pixels to be sent

h - the height of the rectangle of pixels to be sent

See Also:

newPixels(int, int, int, int, boolean), ImageConsumer, setAnimated(boolean), setFullBufferUpdates(boolean)

newPixels

public void newPixels(int x,
             int y,
             int w,
             int h,
             boolean framenotify)

Sends 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 rectangle of pixels to be sent

y - the y coordinate of the upper left corner of the rectangle of pixels to be sent

w - the width of the rectangle of pixels to be sent

h - the height of the rectangle of pixels to be sent

framenotify - true if the consumers should be sent a SINGLEFRAMEDONE notification

See Also:

ImageConsumer, setAnimated(boolean), setFullBufferUpdates(boolean)

newPixels

public void newPixels(byte[] newpix,
             ColorModel newmodel,
             int offset,
             int scansize)

Changes 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.

Parameters:

newpix - the new pixel array

newmodel - the specified ColorModel

offset - the offset into the array

scansize - the distance from one row of pixels to the next in the array

See Also:

newPixels(int, int, int, int, boolean), setAnimated(boolean)

newPixels

public void newPixels(int[] newpix,
             ColorModel newmodel,
             int offset,
             int scansize)

Changes 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.

Parameters:

newpix - the new pixel array

newmodel - the specified ColorModel

offset - the offset into the array

scansize - the distance from one row of pixels to the next in the array

See Also:

newPixels(int, int, int, int, boolean), setAnimated(boolean)