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java.awt.image

Class AreaAveragingScaleFilter

Implemented Interfaces:
Cloneable, ImageConsumer
public class AreaAveragingScaleFilter
extends ReplicateScaleFilter
This filter should produce images which do not have image artifacts like broken lines which were originally unbroken. The cost is of course speed. Using bi-linear interpolation here against 4 pixel points should give the desired results although Sun does not specify what the exact algorithm should be.

Field Summary

Fields inherited from class java.awt.image.ReplicateScaleFilter

destHeight, destWidth, outpixbuf, srcHeight, srcWidth, srccols, srcrows

Fields inherited from class java.awt.image.ImageFilter

consumer

Fields inherited from interface java.awt.image.ImageConsumer

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

Constructor Summary

AreaAveragingScaleFilter(int width, int height)
Construct an instance of AreaAveragingScaleFilter which should be used in conjunction with a FilteredImageSource object.

Method Summary

void
setHints(int flags)
The ImageProducer should call this method with a bit mask of hints from any of RANDOMPIXELORDER, TOPDOWNLEFTRIGHT, COMPLETESCANLINES, SINGLEPASS, SINGLEFRAME from the ImageConsumer interface.
void
setPixels(int x, int y, int w, int h, ColorModel model, byte[] pixels, int offset, int scansize)
This function delivers a rectangle of pixels where any pixel(m,n) is stored in the array as a byte at index (n * scansize + m + offset).
void
setPixels(int x, int y, int w, int h, ColorModel model, int[] pixels, int offset, int scansize)
This function delivers a rectangle of pixels where any pixel(m,n) is stored in the array as an int at index (n * scansize + m + offset).

Methods inherited from class java.awt.image.ReplicateScaleFilter

setDimensions, setPixels, setPixels, setProperties

Methods inherited from class java.awt.image.ImageFilter

clone, getFilterInstance, imageComplete, resendTopDownLeftRight, setColorModel, setDimensions, setHints, setPixels, setPixels, setProperties

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

AreaAveragingScaleFilter

public AreaAveragingScaleFilter(int width,
                                int height)
Construct an instance of AreaAveragingScaleFilter which should be used in conjunction with a FilteredImageSource object.
Parameters:
width - the width of the destination image
height - the height of the destination image

Method Details

setHints

public void setHints(int flags)
The ImageProducer should call this method with a bit mask of hints from any of RANDOMPIXELORDER, TOPDOWNLEFTRIGHT, COMPLETESCANLINES, SINGLEPASS, SINGLEFRAME from the ImageConsumer interface.
FIXME - more than likely Sun's implementation desires TOPDOWNLEFTRIGHT order and this method is overloaded here in order to assure that mask is part of the hints added to the consumer.
Specified by:
setHints in interface ImageConsumer
Overrides:
setHints in interface ImageFilter
Parameters:
flags - a bit mask of hints
See Also:
ImageConsumer

setPixels

public void setPixels(int x,
                      int y,
                      int w,
                      int h,
                      ColorModel model,
                      byte[] pixels,
                      int offset,
                      int scansize)
This function delivers a rectangle of pixels where any pixel(m,n) is stored in the array as a byte at index (n * scansize + m + offset).
Specified by:
setPixels in interface ImageConsumer
Overrides:
setPixels in interface ReplicateScaleFilter
Parameters:
x - the x coordinate of the rectangle
y - the y coordinate of the rectangle
w - the width of the rectangle
h - the height of the rectangle
model - the ColorModel used to translate the pixels
pixels - the array of pixel values
offset - the index of the first pixels in the pixels array
scansize - the width to use in extracting pixels from the pixels array

setPixels

public void setPixels(int x,
                      int y,
                      int w,
                      int h,
                      ColorModel model,
                      int[] pixels,
                      int offset,
                      int scansize)
This function delivers a rectangle of pixels where any pixel(m,n) is stored in the array as an int at index (n * scansize + m + offset).
Specified by:
setPixels in interface ImageConsumer
Overrides:
setPixels in interface ReplicateScaleFilter
Parameters:
x - the x coordinate of the rectangle
y - the y coordinate of the rectangle
w - the width of the rectangle
h - the height of the rectangle
model - the ColorModel used to translate the pixels
pixels - the array of pixel values
offset - the index of the first pixels in the pixels array
scansize - the width to use in extracting pixels from the pixels array
AreaAveragingScaleFilter.java -- Java class for filtering images Copyright (C) 1999,2006 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.

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