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/*
Copyright 2006 Jerry Huxtable
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package com.jhlabs.image;
import java.awt.*;
import java.awt.image.*;
import java.util.*;
/**
* A filter which uses the alpha channel of a "mask" image to interpolate between two source images.
*/
public class ApplyMaskFilter extends AbstractBufferedImageOp {
private BufferedImage destination;
private BufferedImage maskImage;
public ApplyMaskFilter() {
}
public void setDestination( BufferedImage destination ) {
this.destination = destination;
}
public BufferedImage getDestination() {
return destination;
}
public void setMaskImage( BufferedImage maskImage ) {
this.maskImage = maskImage;
}
public BufferedImage getMaskImage() {
return maskImage;
}
public static void composeThroughMask(Raster src, WritableRaster dst, Raster sel) {
int x = src.getMinX();
int y = src.getMinY();
int w = src.getWidth();
int h = src.getHeight();
int srcRGB[] = null;
int selRGB[] = null;
int dstRGB[] = null;
for ( int i = 0; i < h; i++ ) {
srcRGB = src.getPixels(x, y, w, 1, srcRGB);
selRGB = sel.getPixels(x, y, w, 1, selRGB);
dstRGB = dst.getPixels(x, y, w, 1, dstRGB);
int k = x;
for ( int j = 0; j < w; j++ ) {
int sr = srcRGB[k];
int dir = dstRGB[k];
int sg = srcRGB[k+1];
int dig = dstRGB[k+1];
int sb = srcRGB[k+2];
int dib = dstRGB[k+2];
int sa = srcRGB[k+3];
int dia = dstRGB[k+3];
float a = selRGB[k+3]/255f;
float ac = 1-a;
dstRGB[k] = (int)(a*sr + ac*dir);
dstRGB[k+1] = (int)(a*sg + ac*dig);
dstRGB[k+2] = (int)(a*sb + ac*dib);
dstRGB[k+3] = (int)(a*sa + ac*dia);
k += 4;
}
dst.setPixels(x, y, w, 1, dstRGB);
y++;
}
}
public BufferedImage filter( BufferedImage src, BufferedImage dst ) {
int width = src.getWidth();
int height = src.getHeight();
int type = src.getType();
WritableRaster srcRaster = src.getRaster();
if ( dst == null )
dst = createCompatibleDestImage( src, null );
WritableRaster dstRaster = dst.getRaster();
if ( destination != null && maskImage != null )
composeThroughMask( src.getRaster(), dst.getRaster(), maskImage.getRaster() );
return dst;
}
public String toString() {
return "Keying/Key...";
}
}
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