starslices.java

  private void appendStarSlices(ByteArrayBuilder builder) {
        /* Loop through and convert format */
        int widthBytes = (int)((getWidth() + 7) / 8);
        int heightBytes = (int)((getHeight() + 7) / 8);
        int x = 0;
        int y = 0;
        int bit = 0;
        int byteVal =  0;
        boolean[] imgData = getImageAsBooleanArray();

        StringBuilder b = new StringBuilder();
        for (int i = 0; i < widthBytes * getHeight(); i++)
            b.append(new char[0]);
        
        while(true) {
            byteVal |= (imgData[y * getWidth() + x] ? 1 : 0) << 7 - bit;
            x++;
            bit++;
            if (x >= getWidth()) {
                x = 0;
                y++;
                bit = 8;
                if (y > getHeight()) {
                    builder.append(new byte[] { (byte)byteVal } );
                    break;
                }
            }
            if (bit >= 8) {
                builder.append(new byte[] { (byte)byteVal } );
                byteVal = 0;
                bit = 0;
            }
        }

    }