File	Doc	Category	Size	Date	Package
RGBImageFilter.java	API Doc	Java SE 6 API	10244	Tue Jun 10 00:25:28 BST 2008	java.awt.image

RGBImageFilter

• java.lang.Object
  • java.awt.image.ImageFilter

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));
}
}

Fields Summary
protected ColorModel	origmodel The ColorModel to be replaced by newmodel when the user calls {@link #substituteColorModel(ColorModel, ColorModel) substituteColorModel}.
protected ColorModel	newmodel The ColorModel with which to replace origmodel when the user calls substituteColorModel.
protected boolean	canFilterIndexColorModel This boolean indicates whether or not it is acceptable to apply the color filtering of the filterRGB method to the color table entries of an IndexColorModel object in lieu of pixel by pixel filtering. Subclasses should set this variable to true in their constructor if their filterRGB method does not depend on the coordinate of the pixel being filtered.

Constructors Summary

Methods Summary
public java.awt.image.IndexColorModel	filterIndexColorModel(java.awt.image.IndexColorModel 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. param icm the IndexColorModel object to be filtered exception NullPointerException if icm is null return a new IndexColorModel representing the filtered colors int mapsize = icm.getMapSize(); byte r[] = new byte[mapsize]; byte g[] = new byte[mapsize]; byte b[] = new byte[mapsize]; byte a[] = new byte[mapsize]; icm.getReds(r); icm.getGreens(g); icm.getBlues(b); icm.getAlphas(a); int trans = icm.getTransparentPixel(); boolean needalpha = false; for (int i = 0; i < mapsize; i++) { int rgb = filterRGB(-1, -1, icm.getRGB(i)); a[i] = (byte) (rgb >> 24); if (a[i] != ((byte)0xff) && i != trans) { needalpha = true; } r[i] = (byte) (rgb >> 16); g[i] = (byte) (rgb >> 8); b[i] = (byte) (rgb >> 0); } if (needalpha) { return new IndexColorModel(icm.getPixelSize(), mapsize, r, g, b, a); } else { return new IndexColorModel(icm.getPixelSize(), mapsize, r, g, b, trans); }
public abstract int	filterRGB(int x, int y, int rgb) Subclasses must specify a method to convert a single input pixel in the default RGB ColorModel to a single output pixel. param x the X coordinate of the pixel param y the Y coordinate of the pixel param rgb the integer pixel representation in the default RGB color model return a filtered pixel in the default RGB color model. see ColorModel#getRGBdefault see #filterRGBPixels
public void	filterRGBPixels(int x, int y, int w, int h, int[] pixels, int off, int scansize) Filters a buffer of pixels in the default RGB ColorModel by passing them one by one through the filterRGB method. param x the X coordinate of the upper-left corner of the region of pixels param y the Y coordinate of the upper-left corner of the region of pixels param w the width of the region of pixels param h the height of the region of pixels param pixels the array of pixels param off the offset into the pixels array param scansize the distance from one row of pixels to the next in the array see ColorModel#getRGBdefault see #filterRGB int index = off; for (int cy = 0; cy < h; cy++) { for (int cx = 0; cx < w; cx++) { pixels[index] = filterRGB(x + cx, y + cy, pixels[index]); index++; } index += scansize - w; } consumer.setPixels(x, y, w, h, ColorModel.getRGBdefault(), pixels, off, scansize);
public void	setColorModel(java.awt.image.ColorModel 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. see ImageConsumer see ColorModel#getRGBdefault if (canFilterIndexColorModel && (model instanceof IndexColorModel)) { ColorModel newcm = filterIndexColorModel((IndexColorModel)model); substituteColorModel(model, newcm); consumer.setColorModel(newcm); } else { consumer.setColorModel(ColorModel.getRGBdefault()); }
public void	setPixels(int x, int y, int w, int h, java.awt.image.ColorModel model, byte[] pixels, int off, int 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. see ColorModel#getRGBdefault see #filterRGBPixels if (model == origmodel) { consumer.setPixels(x, y, w, h, newmodel, pixels, off, scansize); } else { int filteredpixels[] = new int[w]; int index = off; for (int cy = 0; cy < h; cy++) { for (int cx = 0; cx < w; cx++) { filteredpixels[cx] = model.getRGB((pixels[index] & 0xff)); index++; } index += scansize - w; filterRGBPixels(x, y + cy, w, 1, filteredpixels, 0, w); } }
public void	setPixels(int x, int y, int w, int h, java.awt.image.ColorModel model, int[] pixels, int off, int 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 integer pixels to the default RGB ColorModel and passes the converted buffer to the filterRGBPixels method to be converted one by one. Converts a buffer of integer pixels to the default RGB ColorModel and passes the converted buffer to the filterRGBPixels method. 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. see ColorModel#getRGBdefault see #filterRGBPixels if (model == origmodel) { consumer.setPixels(x, y, w, h, newmodel, pixels, off, scansize); } else { int filteredpixels[] = new int[w]; int index = off; for (int cy = 0; cy < h; cy++) { for (int cx = 0; cx < w; cx++) { filteredpixels[cx] = model.getRGB(pixels[index]); index++; } index += scansize - w; filterRGBPixels(x, y + cy, w, 1, filteredpixels, 0, w); } }
public void	substituteColorModel(java.awt.image.ColorModel oldcm, java.awt.image.ColorModel 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). param oldcm the ColorModel object to be replaced on the fly param newcm the ColorModel object to replace oldcm on the fly origmodel = oldcm; newmodel = newcm;