Class RGBImageFilter
- All Implemented Interfaces:
ImageConsumer,Cloneable
- Direct Known Subclasses:
GrayFilter
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));
}
}
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Field Summary
FieldsModifier and TypeFieldDescriptionprotected booleanThis 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.protected ColorModelTheColorModelwith which to replaceorigmodelwhen the user callssubstituteColorModel.protected ColorModelFields declared in class java.awt.image.ImageFilter
consumerFields declared in interface java.awt.image.ImageConsumer
COMPLETESCANLINES, IMAGEABORTED, IMAGEERROR, RANDOMPIXELORDER, SINGLEFRAME, SINGLEFRAMEDONE, SINGLEPASS, STATICIMAGEDONE, TOPDOWNLEFTRIGHT -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionFilters an IndexColorModel object by running each entry in its color tables through the filterRGB function that RGBImageFilter subclasses must provide.abstract intfilterRGB(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.voidfilterRGBPixels(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.voidsetColorModel(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.voidsetPixels(int x, int y, int w, int h, 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.voidsetPixels(int x, int y, int w, int h, 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.voidsubstituteColorModel(ColorModel oldcm, ColorModel newcm) Registers two ColorModel objects for substitution.Methods declared in class java.awt.image.ImageFilter
clone, getFilterInstance, imageComplete, resendTopDownLeftRight, setDimensions, setHints, setProperties
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Field Details
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origmodel
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newmodel
TheColorModelwith which to replaceorigmodelwhen the user callssubstituteColorModel. -
canFilterIndexColorModel
protected boolean canFilterIndexColorModelThis 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.- See Also:
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Constructor Details
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RGBImageFilter
protected RGBImageFilter()Constructor for subclasses to call.
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Method Details
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setColorModel
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
ImageProducerof theImagewhose 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:
setColorModelin interfaceImageConsumer- Overrides:
setColorModelin classImageFilter- Parameters:
model- the specifiedColorModel- See Also:
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substituteColorModel
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).- Parameters:
oldcm- the ColorModel object to be replaced on the flynewcm- the ColorModel object to replace oldcm on the fly
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filterIndexColorModel
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.- Parameters:
icm- the IndexColorModel object to be filtered- Returns:
- a new IndexColorModel representing the filtered colors
- Throws:
NullPointerException- ificmis null
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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.- Parameters:
x- the X coordinate of the upper-left corner of the region of pixelsy- the Y coordinate of the upper-left corner of the region of pixelsw- the width of the region of pixelsh- the height of the region of pixelspixels- the array of pixelsoff- the offset into thepixelsarrayscansize- the distance from one row of pixels to the next in the array- See Also:
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setPixels
public void setPixels(int x, int y, int w, int h, 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
ImageProducerof theImagewhose 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:
setPixelsin interfaceImageConsumer- Overrides:
setPixelsin classImageFilter- Parameters:
x- the X coordinate of the upper-left corner of the area of pixels to be sety- the Y coordinate of the upper-left corner of the area of pixels to be setw- the width of the area of pixelsh- the height of the area of pixelsmodel- the specifiedColorModelpixels- the array of pixelsoff- the offset into thepixelsarrayscansize- the distance from one row of pixels to the next in thepixelsarray- See Also:
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setPixels
public void setPixels(int x, int y, int w, int h, 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
ImageProducerof theImagewhose 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:
setPixelsin interfaceImageConsumer- Overrides:
setPixelsin classImageFilter- Parameters:
x- the X coordinate of the upper-left corner of the area of pixels to be sety- the Y coordinate of the upper-left corner of the area of pixels to be setw- the width of the area of pixelsh- the height of the area of pixelsmodel- the specifiedColorModelpixels- the array of pixelsoff- the offset into thepixelsarrayscansize- the distance from one row of pixels to the next in thepixelsarray- See Also:
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filterRGB
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.- Parameters:
x- the X coordinate of the pixely- the Y coordinate of the pixelrgb- the integer pixel representation in the default RGB color model- Returns:
- a filtered pixel in the default RGB color model.
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