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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.image.*;
/**
* A filter which flips images or rotates by multiples of 90 degrees.
*/
public class FlipFilter extends AbstractBufferedImageOp {
public static final int FLIP_H = 1;
public static final int FLIP_V = 2;
public static final int FLIP_HV = 3;
public static final int FLIP_90CW = 4;
public static final int FLIP_90CCW = 5;
public static final int FLIP_180 = 6;
private int operation;
private int width, height;
private int newWidth, newHeight;
public FlipFilter() {
this(FLIP_HV);
}
public FlipFilter(int operation) {
this.operation = operation;
}
public void setOperation(int operation) {
this.operation = operation;
}
public int getOperation() {
return operation;
}
public BufferedImage filter( BufferedImage src, BufferedImage dst ) {
int width = src.getWidth();
int height = src.getHeight();
int type = src.getType();
WritableRaster srcRaster = src.getRaster();
int[] inPixels = getRGB( src, 0, 0, width, height, null );
int x = 0, y = 0;
int w = width;
int h = height;
int newX = 0;
int newY = 0;
int newW = w;
int newH = h;
switch (operation) {
case FLIP_H:
newX = width - (x + w);
break;
case FLIP_V:
newY = height - (y + h);
break;
case FLIP_HV:
newW = h;
newH = w;
newX = y;
newY = x;
break;
case FLIP_90CW:
newW = h;
newH = w;
newX = height - (y + h);
newY = x;
break;
case FLIP_90CCW:
newW = h;
newH = w;
newX = y;
newY = width - (x + w);
break;
case FLIP_180:
newX = width - (x + w);
newY = height - (y + h);
break;
}
int[] newPixels = new int[newW * newH];
for (int row = 0; row < h; row++) {
for (int col = 0; col < w; col++) {
int index = row * width + col;
int newRow = row;
int newCol = col;
switch (operation) {
case FLIP_H:
newCol = w - col - 1;
break;
case FLIP_V:
newRow = h - row - 1;
break;
case FLIP_HV:
newRow = col;
newCol = row;
break;
case FLIP_90CW:
newRow = col;
newCol = h - row - 1;;
break;
case FLIP_90CCW:
newRow = w - col - 1;
newCol = row;
break;
case FLIP_180:
newRow = h - row - 1;
newCol = w - col - 1;
break;
}
int newIndex = newRow * newW + newCol;
newPixels[newIndex] = inPixels[index];
}
}
if ( dst == null ) {
ColorModel dstCM = src.getColorModel();
dst = new BufferedImage(dstCM, dstCM.createCompatibleWritableRaster(newW, newH), dstCM.isAlphaPremultiplied(), null);
}
WritableRaster dstRaster = dst.getRaster();
setRGB( dst, 0, 0, newW, newH, newPixels );
return dst;
}
public String toString() {
switch (operation) {
case FLIP_H:
return "Flip Horizontal";
case FLIP_V:
return "Flip Vertical";
case FLIP_HV:
return "Flip Diagonal";
case FLIP_90CW:
return "Rotate 90";
case FLIP_90CCW:
return "Rotate -90";
case FLIP_180:
return "Rotate 180";
}
return "Flip";
}
}
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