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Class Acme.JPM.Filters.RGBAllFilter

java.lang.Object
   |
   +----java.awt.image.ImageFilter
           |
           +----Acme.JPM.Filters.ImageFilterPlus
                   |
                   +----Acme.JPM.Filters.RGBAllFilter

public abstract class RGBAllFilter

extends ImageFilterPlus

Many image filters need to work on the whole image at once. This class collects up the image and hands it to a single routine for processing.

Also, because Java's image classes allow each setPixels() call to use a different color model, we have to convert all pixels into the default RGB model.

Here's a sample RGBAllFilter that smooths an image by averaging nine adjacent pixels.

 class SmoothFilter extends RGBAllFilter
     {
     public void filterRGBAll( int width, int height, int[][] rgbPixels )
         {
         int[][] newPixels = new int[height][width];
         for ( int row = 0; row < height; ++row )
             for ( int col = 0; col < width; ++col )
                 {
                 int a = 0, r = 0, g = 0, b = 0, c = 0;
                 for ( int subrow = row - 1; subrow <= row + 1; ++subrow )
                     if ( subrow >= 0 && subrow < height )
                         for ( int subcol = col - 1; subcol <= col + 1; ++subcol )
                             if ( subcol >= 0 && subcol < width )
                                 {
                                 int pixel = rgbPixels[subrow][subcol];
                                 a += rgbModel.getAlpha( pixel );
                                 r += rgbModel.getRed( pixel );
                                 g += rgbModel.getGreen( pixel );
                                 b += rgbModel.getBlue( pixel );
                                 ++c;
                                 }
                 a /= c;
                 r /= c;
                 g /= c;
                 b /= c;
                 newPixels[row][col] =
                     ( a << 24 ) | ( r << 16 ) | ( g << 8 ) | b;
                 }
         setPixels( width, height, newPixels );
         }
     }
 

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RGBAllFilter(ImageProducer)

filterRGBAll(int, int, int[][])

This is the routine that subclasses must implement.

imageComplete(int)

This routine fixes a bug in java.awt.image.ImageFilter.

setColorModel(ColorModel)

setDimensions(int, int)

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

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

setPixels(int, int, int[][])

The version of setPixels() that gets called by the subclass.

 public RGBAllFilter(ImageProducer producer)

 public abstract void filterRGBAll(int width,
                                   int height,
                                   int rgbPixels[][])

This is the routine that subclasses must implement. It gets the entire image as an int[height][width] in the default RGB color model. It should call setPixels() with a filtered array, same color model.

 public void setPixels(int newWidth,
                       int newHeight,
                       int newPixels[][])

The version of setPixels() that gets called by the subclass.

 public void setColorModel(ColorModel model)

Overrides:

setColorModel in class ImageFilter

 public void setDimensions(int width,
                           int height)

Overrides:

setDimensions in class ImageFilter

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

Overrides:

setPixels in class ImageFilter

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

Overrides:

setPixels in class ImageFilter

 public void imageComplete(int status)

This routine fixes a bug in java.awt.image.ImageFilter.

Overrides:

imageComplete in class ImageFilterPlus

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