[1.3] Original version
Source code inside http://www.caesum.com/handbook/Stegsolve.jar, by Caesum, 2011-05-19
This commit is contained in:
232
stegsolve/CombineTransform.java
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232
stegsolve/CombineTransform.java
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/*
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* CombineTransform.java
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*/
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package stegsolve;
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import java.awt.image.*;
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/**
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* Represents combination of two images
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* @author Caesum
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*/
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public class CombineTransform {
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/**
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* Original images
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*/
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private BufferedImage im1, im2;
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/**
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* Transformed image
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*/
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private BufferedImage transform;
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/**
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* Number of transformation
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*/
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private int transNum;
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private final int NUMTRANS = 13;
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/**
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* Create a new transformation
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* @param bi Image 1
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* @param bi2 Image 2
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*/
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CombineTransform(BufferedImage bi, BufferedImage bi2)
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{
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im1 = bi;
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im2 = bi2;
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transNum=0;
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calcTrans();
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}
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/**
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* interlaces the images
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*/
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private void calcInterlace()
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{
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int width = im1.getWidth();
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if(im2.getWidth()<width) width = im2.getWidth();
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int height = im1.getHeight();
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if(im2.getHeight()<height) height = im2.getHeight();
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if(transNum==11)
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{
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transform = new BufferedImage(width, 2*height, BufferedImage.TYPE_INT_RGB);
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for(int i=0;i<width;i++)
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for(int j=0;j<height;j++)
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{
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transform.setRGB(i, j*2, im1.getRGB(i,j));
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transform.setRGB(i, j*2+1, im2.getRGB(i,j));
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}
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}
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else if(transNum == 12)
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{
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transform = new BufferedImage(2*width, height, BufferedImage.TYPE_INT_RGB);
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for(int i=0;i<width;i++)
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for(int j=0;j<height;j++)
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{
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transform.setRGB(i*2, j, im1.getRGB(i,j));
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transform.setRGB(i*2+1, j, im2.getRGB(i,j));
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}
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}
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}
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/**
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* Combine the images
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*/
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private void calcTrans()
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{
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if(transNum==11||transNum==12)
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{
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calcInterlace();
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return;
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}
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int width = im1.getWidth();
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if(im2.getWidth()>width) width = im2.getWidth();
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int height = im1.getHeight();
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if(im2.getHeight()>height) height = im2.getHeight();
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transform = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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for(int i=0;i<width;i++)
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for(int j=0;j<height;j++)
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{
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int col1=0;
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int col2=0;
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if(i<im1.getWidth()&&j<im1.getHeight())
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col1 = im1.getRGB(i,j);
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if(i<im2.getWidth()&&j<im2.getHeight())
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col2 = im2.getRGB(i,j);
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int col = comb(col1,col2);
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transform.setRGB(i, j, col);
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}
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}
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/**
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* Reduce the offset and try to solve
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*/
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public void back()
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{
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transNum--;
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if(transNum<0) transNum=NUMTRANS-1;
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calcTrans();
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}
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/**
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* Increase the offset and try to solve
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*/
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public void forward()
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{
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transNum++;
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if(transNum>=NUMTRANS) transNum=0;
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calcTrans();
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}
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/**
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* Combines two colours according to transform
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* @param c1 colour 1
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* @param c2 colour 2
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* @return combined colour
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*/
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private int comb(int c1, int c2)
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{
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int r,g,b;
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switch(transNum)
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{
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case 0:
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return c1^c2;
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case 1:
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return c1|c2;
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case 2:
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return c1&c2;
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case 3:
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return c1+c2;
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case 4:
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r = ((c1&0xff0000)+(c2&0xff0000))&0xff0000;
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g = ((c1&0xff00)+(c2&0xff00))&0xff00;
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b = ((c1&0xff)+(c2&0xff))&0xff;
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return r|g|b;
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case 5:
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return c1-c2;
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case 6:
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r = ((c1&0xff0000)-(c2&0xff0000))&0xff0000;
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g = ((c1&0xff00)-(c2&0xff00))&0xff00;
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b = ((c1&0xff)-(c2&0xff))&0xff;
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return r|g|b;
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case 7:
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return c1*c2;
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case 8:
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r = ((((c1&0xff0000)>>16) * ((c2&0xff0000)>> 16))&0xff) << 16;
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g = ((((c1&0xff00)>>8) * ((c2&0xff00)>> 8))&0xff) << 8;
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b = ((c1&0xff) * (c2&0xff))&0xff;
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return r|g|b;
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case 9:
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if((c1&0xff0000)>(c2&0xff0000))
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r=(c1&0xff0000);
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else r=(c2&0xff0000);
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if((c1&0xff00)>(c2&0xff00))
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g=(c1&0xff00);
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else g=(c2&0xff00);
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if((c1&0xff)>(c2&0xff))
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b=(c1&0xff);
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else b=(c2&0xff);
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return r|g|b;
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case 10:
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if((c1&0xff0000)<(c2&0xff0000))
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r=(c1&0xff0000);
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else r=(c2&0xff0000);
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if((c1&0xff00)<(c2&0xff00))
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g=(c1&0xff00);
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else g=(c2&0xff00);
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if((c1&0xff)<(c2&0xff))
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b=(c1&0xff);
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else b=(c2&0xff);
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return r|g|b;
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}
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return 0;
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}
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/**
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* Text description for combination
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* @return string text description of offset
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*/
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public String getText()
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{
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switch(transNum)
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{
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case 0:
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return "XOR";
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case 1:
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return "OR";
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case 2:
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return "AND";
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case 3:
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return "ADD";
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case 4:
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return "ADD (R,G,B separate)";
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case 5:
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return "SUB";
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case 6:
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return "SUB (R,G,B separate)";
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case 7:
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return "MUL";
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case 8:
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return "MUL (R,G,B separate)";
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case 9:
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return "Lightest (R, G, B separate)";
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case 10:
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return "Darkest (R, G, B separate)";
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case 11:
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return "Horizontal Interlace";
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case 12:
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return "Vertical Interlace";
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}
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return "???";
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}
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/**
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* The combined image
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* @return buffered image of the combined image
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*/
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public BufferedImage getImage()
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{
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return transform;
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}
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}
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