java.awt.image

## Class ImageFilter

- java.lang.Object
- - java.awt.image.ImageFilter

- All Implemented Interfaces:
    ImageConsumer, Cloneable
  Direct Known Subclasses:
    BufferedImageFilter, CropImageFilter, ReplicateScaleFilter, RGBImageFilter

      public class ImageFilter
      extends Object
      implements ImageConsumer, Cloneable

  This class implements a filter for the set of interface methods that are used to deliver data from an ImageProducer to an ImageConsumer. It is meant to be used in conjunction with a FilteredImageSource object to produce filtered versions of existing images. It is a base class that provides the calls needed to implement a "Null filter" which has no effect on the data being passed through. Filters should subclass this class and override the methods which deal with the data that needs to be filtered and modify it as necessary.
  See Also:
    `FilteredImageSource`, `ImageConsumer`

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected ImageConsumer` | `consumer` The consumer of the particular image data stream for which this instance of the ImageFilter is filtering data.

    - ### Fields inherited from interface java.awt.image.ImageConsumer

      `COMPLETESCANLINES, IMAGEABORTED, IMAGEERROR, RANDOMPIXELORDER, SINGLEFRAME, SINGLEFRAMEDONE, SINGLEPASS, STATICIMAGEDONE, TOPDOWNLEFTRIGHT`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `ImageFilter()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `Object` | `clone()` Clones this object.
    `ImageFilter` | `getFilterInstance(ImageConsumer ic)` Returns a unique instance of an ImageFilter object which will actually perform the filtering for the specified ImageConsumer.
    `void` | `imageComplete(int status)` Filters the information provided in the imageComplete method of the ImageConsumer interface.
    `void` | `resendTopDownLeftRight(ImageProducer ip)` Responds to a request for a TopDownLeftRight (TDLR) ordered resend of the pixel data from an `ImageConsumer`.
    `void` | `setColorModel(ColorModel model)` Filter the information provided in the setColorModel method of the ImageConsumer interface.
    `void` | `setDimensions(int width, int height)` Filters the information provided in the setDimensions method of the ImageConsumer interface.
    `void` | `setHints(int hints)` Filters the information provided in the setHints method of the ImageConsumer interface.
    `void` | `setPixels(int x, int y, int w, int h, ColorModel model, byte[] pixels, int off, int scansize)` Filters the information provided in the setPixels method of the ImageConsumer interface which takes an array of bytes.
    `void` | `setPixels(int x, int y, int w, int h, ColorModel model, int[] pixels, int off, int scansize)` Filters the information provided in the setPixels method of the ImageConsumer interface which takes an array of integers.
    `void` | `setProperties(Hashtable<?,?> props)` Passes the properties from the source object along after adding a property indicating the stream of filters it has been run through.

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### consumer

          protected ImageConsumer consumer

      The consumer of the particular image data stream for which this instance of the ImageFilter is filtering data. It is not initialized during the constructor, but rather during the getFilterInstance() method call when the FilteredImageSource is creating a unique instance of this object for a particular image data stream.
      See Also:
        `getFilterInstance(java.awt.image.ImageConsumer)`, `ImageConsumer`

  - ### Constructor Detail

    - #### ImageFilter

          public ImageFilter()

  - ### Method Detail

    - #### getFilterInstance

          public ImageFilter getFilterInstance(ImageConsumer ic)

      Returns a unique instance of an ImageFilter object which will actually perform the filtering for the specified ImageConsumer. The default implementation just clones this object.

      Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

      Parameters:
        `ic` - the specified `ImageConsumer`
      Returns:
        an `ImageFilter` used to perform the filtering for the specified `ImageConsumer`.

    - #### setDimensions

          public void setDimensions(int width,
                           int height)

      Filters the information provided in the setDimensions method of the ImageConsumer interface.

      Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

      Specified by:
        `setDimensions` in interface `ImageConsumer`
      Parameters:
        `width` - the width of the source image
        `height` - the height of the source image
      See Also:
        `ImageConsumer.setDimensions(int, int)`

    - #### setProperties

          public void setProperties(Hashtable<?,?> props)

      Passes the properties from the source object along after adding a property indicating the stream of filters it has been run through.

      Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

      Specified by:
        `setProperties` in interface `ImageConsumer`
      Parameters:
        `props` - the properties from the source object
      Throws:
        `NullPointerException` - if `props` is null

    - #### setColorModel

          public void setColorModel(ColorModel model)

      Filter the information provided in the setColorModel method of the ImageConsumer interface.

      Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

      Specified by:
        `setColorModel` in interface `ImageConsumer`
      Parameters:
        `model` - the specified `ColorModel`
      See Also:
        `ImageConsumer.setColorModel(java.awt.image.ColorModel)`

    - #### setHints

          public void setHints(int hints)

      Filters the information provided in the setHints method of the ImageConsumer interface.

      Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

      Specified by:
        `setHints` in interface `ImageConsumer`
      Parameters:
        `hints` - a set of hints that the ImageConsumer uses to process the pixels
      See Also:
        `ImageConsumer.setHints(int)`

    - #### setPixels

          public void setPixels(int x,
                       int y,
                       int w,
                       int h,
                       ColorModel model,
                       byte[] pixels,
                       int off,
                       int scansize)

      Filters the information provided in the setPixels method of the ImageConsumer interface which takes an array of bytes.

      Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

      Specified by:
        `setPixels` in interface `ImageConsumer`
      Parameters:
        `x` - the X coordinate of the upper-left corner of the area of pixels to be set
        `y` - the Y coordinate of the upper-left corner of the area of pixels to be set
        `w` - the width of the area of pixels
        `h` - the height of the area of pixels
        `model` - the specified `ColorModel`
        `pixels` - the array of pixels
        `off` - the offset into the `pixels` array
        `scansize` - the distance from one row of pixels to the next in the `pixels` array
      See Also:
        `ImageConsumer.setPixels(int, int, int, int, java.awt.image.ColorModel, byte[], int, int)`

    - #### setPixels

          public void setPixels(int x,
                       int y,
                       int w,
                       int h,
                       ColorModel model,
                       int[] pixels,
                       int off,
                       int scansize)

      Filters the information provided in the setPixels method of the ImageConsumer interface which takes an array of integers.

      Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

      Specified by:
        `setPixels` in interface `ImageConsumer`
      Parameters:
        `x` - the X coordinate of the upper-left corner of the area of pixels to be set
        `y` - the Y coordinate of the upper-left corner of the area of pixels to be set
        `w` - the width of the area of pixels
        `h` - the height of the area of pixels
        `model` - the specified `ColorModel`
        `pixels` - the array of pixels
        `off` - the offset into the `pixels` array
        `scansize` - the distance from one row of pixels to the next in the `pixels` array
      See Also:
        `ImageConsumer.setPixels(int, int, int, int, java.awt.image.ColorModel, byte[], int, int)`

    - #### imageComplete

          public void imageComplete(int status)

      Filters the information provided in the imageComplete method of the ImageConsumer interface.

      Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

      Specified by:
        `imageComplete` in interface `ImageConsumer`
      Parameters:
        `status` - the status of image loading
      See Also:
        `ImageConsumer.imageComplete(int)`

    - #### resendTopDownLeftRight

          public void resendTopDownLeftRight(ImageProducer ip)

      Responds to a request for a TopDownLeftRight (TDLR) ordered resend of the pixel data from an `ImageConsumer`. When an `ImageConsumer` being fed by an instance of this `ImageFilter` requests a resend of the data in TDLR order, the `FilteredImageSource` invokes this method of the `ImageFilter`.

      An `ImageFilter` subclass might override this method or not, depending on if and how it can send data in TDLR order. Three possibilities exist:

      - Do not override this method. This makes the subclass use the default implementation, which is to forward the request to the indicated `ImageProducer` using this filter as the requesting `ImageConsumer`. This behavior is appropriate if the filter can determine that it will forward the pixels in TDLR order if its upstream producer object sends them in TDLR order.
      - Override the method to simply send the data. This is appropriate if the filter can handle the request itself — for example, if the generated pixels have been saved in some sort of buffer.
      - Override the method to do nothing. This is appropriate if the filter cannot produce filtered data in TDLR order.
      Parameters:
        `ip` - the ImageProducer that is feeding this instance of the filter - also the ImageProducer that the request should be forwarded to if necessary
      Throws:
        `NullPointerException` - if `ip` is null
      See Also:
        `ImageProducer.requestTopDownLeftRightResend(java.awt.image.ImageConsumer)`

    - #### clone

          public Object clone()

      Clones this object.
      Overrides:
        `clone` in class `Object`
      Returns:
        a clone of this instance.
      See Also:
        `Cloneable`

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