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

This class provides an easy way to create an ImageFilter which modifies the pixels of an image in the default RGB ColorModel. It is meant to be used in conjunction with a FilteredImageSource object to produce filtered versions of existing images. It is an abstract class that provides the calls needed to channel all of the pixel data through a single method which converts pixels one at a time in the default RGB ColorModel regardless of the ColorModel being used by the ImageProducer. The only method which needs to be defined to create a useable image filter is the filterRGB method. Here is an example of a definition of a filter which swaps the red and blue components of an image:

 class RedBlueSwapFilter extends RGBImageFilter {
     public RedBlueSwapFilter() {
         // The filter's operation does not depend on the
         // pixel's location, so IndexColorModels can be
         // filtered directly.
         canFilterIndexColorModel = true;
     }

     public int filterRGB(int x, int y, int rgb) {
         return ((rgb & 0xff00ff00)
                 | ((rgb & 0xff0000) >> 16)
                 | ((rgb & 0xff) << 16));
     }
 }

->rgb-image-filter clj

(->rgb-image-filter)

Constructor.

filter-index-color-model clj

(filter-index-color-model this icm)

Filters an IndexColorModel object by running each entry in its color tables through the filterRGB function that RGBImageFilter subclasses must provide. Uses coordinates of -1 to indicate that a color table entry is being filtered rather than an actual pixel value.

icm - the IndexColorModel object to be filtered - java.awt.image.IndexColorModel

returns: a new IndexColorModel representing the filtered colors - java.awt.image.IndexColorModel

throws: java.lang.NullPointerException - if icm is null

filter-rgb clj

(filter-rgb this x y rgb)

Subclasses must specify a method to convert a single input pixel in the default RGB ColorModel to a single output pixel.

x - the X coordinate of the pixel - int y - the Y coordinate of the pixel - int rgb - the integer pixel representation in the default RGB color model - int

returns: a filtered pixel in the default RGB color model. - int

filter-rgb-pixels clj

(filter-rgb-pixels this x y w h pixels off scansize)

Filters a buffer of pixels in the default RGB ColorModel by passing them one by one through the filterRGB method.

x - the X coordinate of the upper-left corner of the region of pixels - int y - the Y coordinate of the upper-left corner of the region of pixels - int w - the width of the region of pixels - int h - the height of the region of pixels - int pixels - the array of pixels - int[] off - the offset into the pixels array - int scansize - the distance from one row of pixels to the next in the array - int

set-color-model clj

(set-color-model this model)

If the ColorModel is an IndexColorModel and the subclass has set the canFilterIndexColorModel flag to true, we substitute a filtered version of the color model here and wherever that original ColorModel object appears in the setPixels methods. If the ColorModel is not an IndexColorModel or is null, this method overrides the default ColorModel used by the ImageProducer and specifies the default RGB ColorModel instead.

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.

model - the specified ColorModel - java.awt.image.ColorModel

set-pixels clj

(set-pixels this x y w h model pixels off scansize)

If the ColorModel object is the same one that has already been converted, then simply passes the pixels through with the converted ColorModel. Otherwise converts the buffer of byte pixels to the default RGB ColorModel and passes the converted buffer to the filterRGBPixels method to be converted one by one.

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.

x - the X coordinate of the upper-left corner of the area of pixels to be set - int y - the Y coordinate of the upper-left corner of the area of pixels to be set - int w - the width of the area of pixels - int h - the height of the area of pixels - int model - the specified ColorModel - java.awt.image.ColorModel pixels - the array of pixels - byte[] off - the offset into the pixels array - int scansize - the distance from one row of pixels to the next in the pixels array - int

substitute-color-model clj

(substitute-color-model this oldcm newcm)

Registers two ColorModel objects for substitution. If the oldcm is encountered during any of the setPixels methods, the newcm is substituted and the pixels passed through untouched (but with the new ColorModel object).

oldcm - the ColorModel object to be replaced on the fly - java.awt.image.ColorModel newcm - the ColorModel object to replace oldcm on the fly - java.awt.image.ColorModel