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java.awt.image Reference
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ImageFilter

Name

ImageFilter

[Graphic: Figure from the text]

Description

The ImageFilter class sits between the ImageProducer and ImageConsumer as an image is being created to provide a filtered version of that image. Image filters are always used in conjunction with a FilteredImageSource. As an implementer of the ImageConsumer interface, an image filter receives pixel data from the original image's source and delivers it to another image consumer. The ImageFilter class implements a null filter (i.e., the new image is the same as the original); to produce a filter that modifies an image, create a subclass of ImageFilter.

Class Definition

public class java.awt.image.ImageFilter
    extends java.lang.Object 
    implements java.awt.image.ImageConsumer, java.lang.Cloneable {
  // Variables
  protected ImageConsumer consumer;
  // Constructors
  public ImageFilter();
  // Instance Methods
  public Object clone();
  public ImageFilter getFilterInstance (ImageConsumer ic);
  public void imageComplete (int status);
  public void resendTopDownLeftRight (ImageProducer ip);
  public void setColorModel (ColorModel model);
  public void setDimensions (int width, int height);
  public void setHints (int hints);
  public void setPixels (int x, int y, int width, int height, 
      ColorModel model, byte[] pixels, int offset, int scansize);
  public void setPixels (int x, int y, int width, int height, 
      ColorModel model, int[] pixels, int offset, int scansize);
  public void setProperties (Hashtable properties);
}

Protected Variables

consumer

protected ImageConsumer consumer

The consumer variable is a reference to the actual ImageConsumer for the Image.

Constructors

ImageFilter

public ImageFilter()

Description

Constructs an empty ImageFilter instance.

Instance Methods

clone

public Object clone()

Overrides

Object.clone()

Returns

A copy of the ImageFilter instance.

getFilterInstance

public ImageFilter getFilterInstance (ImageConsumer ic)

Parameters

ic

The consumer in question.

Returns

A copy of the ImageFilter instance.

Description

Returns the filter that will do the filtering for ic.

imageComplete

void imageComplete (int status)

Parameters

status

Image loading completion status flags.

Implements

ImageConsumer.imageComplete(int)

Description

Called by the ImageProducer to indicate an image's completion status. ImageFilter passes these flags to the consumer unchanged.

resendTopDownLeftRight

public void resendTopDownLeftRight (ImageProducer ip)

Parameters

ip

The ImageProducer generating the original image.

Description

Called by the ImageConsumer to ask the filter to resend the image data in the top-down, left-to-right order. In ImageFilter, this method calls the same method in the ImageProducer, thus relaying the request.

setColorModel

void setColorModel (ColorModel model)

Parameters

model

The color model for the image.

Implements

ImageConsumer.setColorModel(ColorModel)

Description

Sets the image's color model.

setDimensions

void setDimensions (int width, int height)

Parameters

width

Width for image.

height

Height for image.

Implements

ImageConsumer.setDimensions(int, int)

Description

Sets the image's dimensions.

setHints

void setHints (int hints)

Parameters

hints

Image consumption hints.

Implements

ImageConsumer.setHints(int)

Description

Called by the ImageProducer to deliver hints about how the image data will be delivered. ImageFilter passes these hints on to the ImageConsumer.

setPixels

void setPixels (int x, int y, int width, int height, ColorModel model, byte[] pixels, int offset, int scansize)

Parameters

x

x-coordinate of top-left corner of pixel data delivered with this method call.

y

y-coordinate of top-left corner of pixel data delivered with this method call.

width

Width of the rectangle of pixel data delivered with this method call.

height

Height of the rectangle of pixel data delivered with this method call.

model

Color model of image data.

pixels

Image data.

offset

Offset from beginning of the pixels array.

scansize

Size of each line of data in pixels array.

Implements

ImageConsumer.setPixels(int, int, int, int, ColorModel, byte[], int, int)

Description

Delivers a rectangular block of pixels to the ImageFilter. ImageFilter passes these pixels on to the consumer unchanged.

void setPixels (int x, int y, int width, int height, ColorModel model, int[] pixels, int offset, int scansize)

Parameters

x

x-coordinate of top-left corner of pixel data delivered with this method call.

y

y-coordinate of top-left corner of pixel data delivered with this method call.

width

Width of the rectangle of pixel data delivered with this method call.

height

Height of the rectangle of pixel data delivered with this method call.

model

Color model of image data.

pixels

Image data.

offset

Offset from beginning of the pixels array.

scansize

Size of each line of data in pixels array.

Implements

ImageConsumer.setPixels(int, int, int, int, ColorModel, int[], int, int)

Description

Delivers a rectangular block of pixels to the ImageFilter. ImageFilter passes these pixels on to the consumer unchanged.

setProperties

void setProperties (Hashtable properties)

Parameters

properties

The properties for the image.

Implements

ImageConsumer.setProperties(Hashtable)

Description

Initializes the image's properties. ImageFilter adds the property "filter" to the Hashtable, and passes the result on to the image consumer; the value of the property is the string returned by the filter's toString() method. If the property "filter" is already in the Hashtable, ImageFilter adds the string returned by its toString() method to the value already associated with that property.

See Also

Cloneable, ColorModel, CropImageFilter, Hashtable, ImageConsumer, ImageProducer, Object, ReplicateImageFilter, RGBImageFilter


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