jdk.awt.image.MemoryImageSource — clojure-interop/java.awt 1.0.5

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);
     }
 }

->memory-image-source clj

(->memory-image-source w h pix off scan)

(->memory-image-source w h cm pix off scan)

(->memory-image-source w h cm pix off scan props)

Constructor.

Constructs an ImageProducer object which uses an array of bytes to produce data for an Image object.

w - the width of the rectangle of pixels - int h - the height of the rectangle of pixels - int cm - the specified ColorModel - java.awt.image.ColorModel pix - an array of pixels - byte[] off - the offset into the array of where to store the first pixel - int scan - the distance from one row of pixels to the next in the array - int props - a list of properties that the ImageProducer uses to process an image - java.util.Hashtable

add-consumer clj

(add-consumer this ic)

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

ic - the specified ImageConsumer - java.awt.image.ImageConsumer

throws: java.lang.NullPointerException - if the specified ImageConsumer is null

consumer? clj

(consumer? this ic)

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

ic - the specified ImageConsumer - java.awt.image.ImageConsumer

returns: true if the ImageConsumer is on the list; false otherwise. - boolean

new-pixels clj

(new-pixels this)

(new-pixels this x y w h)

(new-pixels this x y w h 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.

x - the x coordinate of the upper left corner of the rectangle of pixels to be sent - int y - the y coordinate of the upper left corner of the rectangle of pixels to be sent - int w - the width of the rectangle of pixels to be sent - int h - the height of the rectangle of pixels to be sent - int framenotify - true if the consumers should be sent a SINGLEFRAMEDONE notification - boolean

remove-consumer clj

(remove-consumer this ic)

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

ic - the specified ImageConsumer - java.awt.image.ImageConsumer

request-top-down-left-right-resend clj

(request-top-down-left-right-resend this ic)

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

ic - the specified ImageConsumer - java.awt.image.ImageConsumer

set-animated clj

(set-animated this 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.

animated - true if the image is a multi-frame animation - boolean

set-full-buffer-updates clj

(set-full-buffer-updates this 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.

fullbuffers - true if the complete pixel buffer should always be sent - boolean

start-production clj

(start-production this 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.

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