ToBrl.java

/*
 * Copyright 2016 (C) Christoph-Simon Senjak
 * 
 * Mail: System.out.println(new StringBuilder("ed" + "." + "luxu" + "@" + "ssc").reverse().toString());
 */
import java.io.IOException;
import javax.imageio.ImageIO;
import java.io.File;
import java.awt.image.BufferedImage;

public class ToBrl {

    public static int imgBool (int y, int x, boolean[][] image) {
	try {
	    return image[y][x] ? 1 : 0;
	} catch (ArrayIndexOutOfBoundsException e) {
	    return 0; // default to background
	} catch (NullPointerException e) {
	    return 0; // default to background
	}
    }

    public static char brailleAt (int x, int y, boolean[][] image) {
	return (char)
	    (0x2800 |
	     ( imgBool(y+0, x+0, image) << 0 ) | // 1
	     ( imgBool(y+1, x+0, image) << 1 ) | // 2
	     ( imgBool(y+2, x+0, image) << 2 ) | // 3
	     ( imgBool(y+0, x+1, image) << 3 ) | // 4
	     ( imgBool(y+1, x+1, image) << 4 ) | // 5
	     ( imgBool(y+2, x+1, image) << 5 ) | // 6
	     ( imgBool(y+3, x+0, image) << 6 ) | // 7
	     ( imgBool(y+3, x+1, image) << 7 ) ); // 8
    }
    
    public static void main (String[] args) {
	if (args.length != 1) {
	    System.err.println("Exactly one argument expected.");
	    System.exit(-1);
	} else {
	    try {
		BufferedImage img = ImageIO.read(new File(args[0]));


		int width = img.getWidth();
		int height = img.getHeight();

		boolean[][] pixeldata = new boolean[height][];
		
		for (int y = 0; y < img.getHeight(); ++y) {
		    pixeldata[y] = new boolean[width];
		    for (int x = 0; x < img.getWidth(); ++x) {
			int rgb = img.getRGB(x, y);
			int z = ((rgb & 0xFF) + ((rgb >> 8) & 0xFF) + ((rgb >> 16) & 0xFF)) / 3;
			int a = (rgb >> 24) & 0xFF;
			pixeldata[y][x] = (a > 0x7F) && (z < 0x7F);
		    }
		}

		StringBuffer buf = new StringBuffer("");
		for (int y = 0; y < height; y += 4) {
		    for (int x = 0; x < width; x += 2) {
			buf.append(brailleAt(x, y, pixeldata));
		    }
		    buf.append('\n');
		}
		System.out.print(buf);		
	    } catch (IOException e) {
		e.printStackTrace();
		System.exit(-1);
	    }
	}
    }
}