since: 1.5 -

since: JDK1.1 -

since: JDK1.1 -

since: JDK1.1 -

Also see:

java.awt.image.ReplicateScaleFilter
since: JDK1.1 -

Also see:

java.awt.image.AreaAveragingScaleFilter
since: JDK1.1 -

 public  void flush() 
{
        if (surfaceManager != null) {
            surfaceManager.flush();
        }
}

Flushes all reconstructable resources being used by this Image object. This includes any pixel data that is being cached for rendering to the screen as well as any system resources that are being used to store data or pixels for the image if they can be recreated. The image is reset to a state similar to when it was first created so that if it is again rendered, the image data will have to be recreated or fetched again from its source.

Examples of how this method affects specific types of Image object:

• BufferedImage objects leave the primary Raster which stores their pixels untouched, but flush any information cached about those pixels such as copies uploaded to the display hardware for accelerated blits.
• Image objects created by the Component methods which take a width and height leave their primary buffer of pixels untouched, but have all cached information released much like is done for BufferedImage objects.
• VolatileImage objects release all of their pixel resources including their primary copy which is typically stored on the display hardware where resources are scarce. These objects can later be restored using their validate method.
• Image objects created by the Toolkit and Component classes which are loaded from files, URLs or produced by an ImageProducer are unloaded and all local resources are released. These objects can later be reloaded from their original source as needed when they are rendered, just as when they were first created.

 public float getAccelerationPriority() 
{
        return accelerationPriority;
}

Returns the current value of the acceleration priority hint.

 public ImageCapabilities getCapabilities(GraphicsConfiguration gc) 
{
        if (surfaceManager != null) {
            return surfaceManager.getCapabilities(gc);
        }
        // Note: this is just a default object that gets returned in the
        // absence of any more specific information from a surfaceManager.
        // Subclasses of Image should either override this method or
        // make sure that they always have a non-null SurfaceManager
        // to return an ImageCapabilities object that is appropriate
        // for their given subclass type.
        return defaultImageCaps;
}

Returns an ImageCapabilities object which can be inquired as to the capabilities of this Image on the specified GraphicsConfiguration. This allows programmers to find out more runtime information on the specific Image object that they have created. For example, the user might create a BufferedImage but the system may have no video memory left for creating an image of that size on the given GraphicsConfiguration, so although the object may be acceleratable in general, it does not have that capability on this GraphicsConfiguration.

 abstract public Graphics getGraphics()
Creates a graphics context for drawing to an off-screen image.
This method can only be called for off-screen images.

 abstract public int getHeight(ImageObserver observer)
Determines the height of the image. If the height is not yet known,
this method returns -1 and the specified
ImageObserver object is notified later.

 abstract public Object getProperty(String name,
    ImageObserver observer)
Gets a property of this image by name.

Individual property names are defined by the various image
formats. If a property is not defined for a particular image, this
method returns the UndefinedProperty object.

If the properties for this image are not yet known, this method
returns null, and the ImageObserver
object is notified later.

The property name "comment" should be used to store
an optional comment which can be presented to the application as a
description of the image, its source, or its author.

 public Image getScaledInstance(int width,
    int height,
    int hints) 
{
        ImageFilter filter;
        if ((hints & (SCALE_SMOOTH | SCALE_AREA_AVERAGING)) != 0) {
            filter = new AreaAveragingScaleFilter(width, height);
        } else {
            filter = new ReplicateScaleFilter(width, height);
        }
        ImageProducer prod;
        prod = new FilteredImageSource(getSource(), filter);
        return Toolkit.getDefaultToolkit().createImage(prod);
}

Creates a scaled version of this image. A new Image object is returned which will render the image at the specified width and height by default. The new Image object may be loaded asynchronously even if the original source image has already been loaded completely.

If either width or height is a negative number then a value is substituted to maintain the aspect ratio of the original image dimensions. If both width and height are negative, then the original image dimensions are used.

 abstract public ImageProducer getSource()
Gets the object that produces the pixels for the image.
This method is called by the image filtering classes and by
methods that perform image conversion and scaling.

 abstract public int getWidth(ImageObserver observer)
Determines the width of the image. If the width is not yet known,
this method returns -1 and the specified
ImageObserver object is notified later.

 public  void setAccelerationPriority(float priority) 
{
        if (priority <  0 || priority  > 1) {
            throw new IllegalArgumentException("Priority must be a value " +
                                               "between 0 and 1, inclusive");
        }
        accelerationPriority = priority;
        if (surfaceManager != null) {
            surfaceManager.setAccelerationPriority(accelerationPriority);
        }
}

Sets a hint for this image about how important acceleration is. This priority hint is used to compare to the priorities of other Image objects when determining how to use scarce acceleration resources such as video memory. When and if it is possible to accelerate this Image, if there are not enough resources available to provide that acceleration but enough can be freed up by de-accelerating some other image of lower priority, then that other Image may be de-accelerated in deference to this one. Images that have the same priority take up resources on a first-come, first-served basis.