This file is indexed.

/usr/bin/xkeystone is in x11-xserver-utils 7.7+7+b1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
#!/usr/bin/env nickle
/*
 * Copyright © 2008 Keith Packard
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

autoload Process;
autoload Nichrome;
autoload Nichrome::Box;
autoload Nichrome::Label;
autoload Nichrome::Button;

extend namespace Nichrome {
    public namespace Quad {
	public typedef quad_t;
	public typedef widget_t + struct {
	    point_t[4]	    p;
	    real	    line_width;
	    real	    corner_diameter;
	    rgba_color_t    line_color;
	    rgba_color_t    corner_color;
	    bool	    down;
	    bool	    started;
	    int		    active_corner;
	    void(&quad_t)   callback;
	} quad_t;

	protected void outline (cairo_t cr, &quad_t quad) {
	    for (int i = 0; i < dim (quad.p); i++) {
		arc (cr, quad.p[i].x, quad.p[i].y,
		     quad.corner_diameter / 2, 0, 2 * pi);
		close_path (cr);
	    }
	}

	protected void natural (cairo_t cr, &quad_t quad) {
	    rectangle (cr, 0, 0, 400, 300);
	}

	void text_at (cairo_t cr, point_t p, string text) {
	    text_extents_t  e = text_extents (cr, text);
	    p.x = p.x - e.width / 2 - e.x_bearing;
	    p.y = p.y - e.height / 2 - e.y_bearing;
	    move_to (cr, p.x, p.y);
	    show_text (cr, text);
	}

	protected void draw (cairo_t cr, &quad_t quad) {
	    if (!quad.started) {
		quad.p[2].x = quad.p[1].x = quad.geometry.width;
		quad.p[3].y = quad.p[2].y = quad.geometry.height;
		quad.started = true;
	    }
	    rectangle (cr, 0, 0, quad.geometry.width, quad.geometry.height);
	    set_source_rgba (cr, 0, 0, 0, .25);
	    fill (cr);
	    for (int i = 0; i < dim (quad.p); i++)
		line_to (cr, quad.p[i].x, quad.p[i].y);
	    close_path (cr);
	    set_line_width (cr, quad.line_width);
	    set_source_rgba (cr, quad.line_color.red, quad.line_color.green,
			     quad.line_color.blue, quad.line_color.alpha);
	    set_line_join (cr, line_join_t.ROUND);
	    stroke (cr);
	    set_source_rgba (cr, quad.corner_color.red, quad.corner_color.green,
			     quad.corner_color.blue, quad.corner_color.alpha);
	    outline (cr, &quad);
	    fill (cr);
	    set_source_rgba (cr, 1, 1, 1, 1);
	    for (int i = 0; i < dim (quad.p); i++)
		text_at (cr, quad.p[i], sprintf ("%d", i));
	}

	int nearest (&quad_t quad, point_t p) {
	    real    best_dist2 = 0;
	    int	    best = 0;

	    for (int i = 0; i < dim (quad.p); i++) {
		real dist2 = ((p.x - quad.p[i].x) ** 2 +
			      (p.y - quad.p[i].y) ** 2);
		if (i == 0 || dist2 < best_dist2) {
		    best_dist2 = dist2;
		    best = i;
		}
	    }
	    return best;
	}

	protected void button (&quad_t quad, &button_event_t event) {
	    enum switch (event.type) {
	    case press:
		quad.down = true;
		quad.active_corner = nearest (&quad, event);
		break;
	    case release:
		quad.down = false;
		break;
	    default:
		break;
	    }
	}

	protected void motion (&quad_t quad, &motion_event_t motion) {
	    if (quad.down) {
		motion.x = max (0, min (quad.geometry.width, motion.x));
		motion.y = max (0, min (quad.geometry.height, motion.y));
		quad.p[quad.active_corner].x = motion.x;
		quad.p[quad.active_corner].y = motion.y;
		quad.callback (&quad);
		Widget::reoutline (&quad);
		Widget::redraw (&quad);
	    }
	}

	protected void configure (&quad_t quad,
				  rect_t geometry)
	{
	    if (quad.geometry.width > 0 && quad.geometry.height > 0)
	    {
		real    x_scale = geometry.width / quad.geometry.width;
		real    y_scale = geometry.height / quad.geometry.height;
		for (int i = 0; i< 4; i++) {
		    quad.p[i].x *= x_scale;
		    quad.p[i].y *= y_scale;
		}
	    }
	    Widget::configure (&quad, geometry);
	    quad.callback (&quad);
	}
	
	protected void init (&quad_t quad,
			     &nichrome_t nichrome,
			     void (&quad_t) callback) {
	    Widget::init (&nichrome, &quad);
	    quad.outline = outline;
	    quad.draw = draw;
	    quad.button = button;
	    quad.motion = motion;
	    quad.configure = configure;
	    quad.natural = natural;
	    quad.p = (point_t[4]) {
		{ x = 0, y = 0 } ...
	    };
	    quad.line_color = (rgba_color_t) {
		red = 1, green = 0, blue = 0, alpha = .5
	    };
	    quad.line_width = 10;
	    quad.corner_color = (rgba_color_t) {
		red = 0, green = 0, blue = 1, alpha = 0.75
	    };
	    quad.corner_diameter = 20;
	    quad.down = false;
	    quad.active_corner = -1;
	    quad.callback = callback;
	    quad.started = false;
	}

	protected *quad_t new (&nichrome_t nichrome, void(&quad_t) callback) {
	    quad_t  quad;

	    init (&quad, &nichrome, callback);
	    return &quad;
	}
    }
}
import Nichrome;
import Nichrome::Box;
import Nichrome::Label;
import Nichrome::Button;
import Nichrome::Quad;

import Cairo;
typedef real[3,3]   m_t;
typedef point_t[4]  q_t;

/*
 * Ok, given an source quad and a dest rectangle, compute
 * a transform that maps the rectangle to q. That's easier
 * as the rectangle has some nice simple properties. Invert
 * the matrix to find the opposite mapping
 *
 *  q0    q1
 *
 *  q3    q2
 *
 *  | m00 m01 m02 |
 *  | m10 m11 m12 |
 *  | m20 m21 m22 |
 *
 *  m [ 0 0 1 ] = q[0]
 *
 * Set m22 to 1, and solve:
 *
 *  |     m02       ,     m12       , 1 | = | q0x, q0y, 1 |
 *
 *  | m00 * w + q0x   m10 * w + q0y     |
 *  | ------------- , ------------- , 1 | = | q1x, q1y, 1 |
 *  |  m20 * w + 1     m20 * w + 1      |

 *   m00*w + q0x = q1x*(m20*w + 1)
 *   m00 = m20*q1x + (q1x - q0x) / w;
 *
 *   m10*w + q0y = q1y*(m20*w + 1)
 *   m10 = m20*q1y + (q1y - q0y) / w;
 *
 *   m01*h + q0x = q3x*(m21*h + 1)
 *   m01 = m21*q3x + (q3x - q0x) / h;
 *
 *   m11*h + q0y = q3y*(m21*h + 1)
 *   m11 = m21*q3y + (q3y - q0y) / h
 *
 *   m00*w +                 m01*h +                 q0x = q2x*(m20*w + m21*h + 1)
 *
 *   m20*q1x*w + q1x - q0x + m21*q3x*h + q3x - q0x + q0x = m20*q2x*w + m21*q2x*h + q2x
 *
 *   m20*q1x*w - m20*q2x*w = m21*q2x*h - m21*q3x*h + q2x - q1x + q0x - q3x + q0x - q0x
 *
 *   m20*(q1x - q2x)*w     = m21*(q2x - q3x)*h     + q2x - q1x - q3x + q0x
 *
 *
 *   m10*w +                 m11*h +                 q0y = q2y*(m20*w + m21*h + 1)
 *
 *   m20*q1y*w + q1y - q0y + m21*q3y*h + q3y - q0y + q0y = m20*q2y*w + m21*q2y*h + q2y
 *
 *   m20*q1y*w - m20*q2y*w = m21*q2y*h - m21*q3y*h + q2y - q1y + q0y - q3y + q0y - q0y
 *
 *   m20*(q1y - q2y)*w     = m21*(q2y - q3y)*h     + q2y - q1y - q3y + q0y
 *
 *
 *   m20*(q1x - q2x)*(q1y - q2y)*w     = m21*(q2x - q3x)*(q1y - q2y)*h     + (q2x - q1x - q3x + q0x)*(q1y - q2y)
 *
 *   m20*(q1y - q2y)*(q1x - q2x)*w     = m21*(q2y - q3y)*(q1x - q2x)*h     + (q2y - q1y - q3y + q0y)*(q1x - q2x)
 *
 *   0                                 = m21*((q2x - q3x)*(q1y - q2y) - (q2y - q3y)*(q1x - q2x))*h + (stuff)
 *                                     = m21 * a + b;
 *
 *   m21 = -(stuff) / (other stuff)
 *
 *   m20 = f(m21)
 *
 *  m00 = f(m20)
 *  m10 = f(m20)
 *
 *  m01 = f(m21)
 *  m11 = f(m21)
 *
 * done.
 */
m_t solve (q_t q, real w, real h)
{
    real    q0x = q[0].x, q0y = q[0].y;
    real    q1x = q[1].x, q1y = q[1].y;
    real    q2x = q[2].x, q2y = q[2].y;
    real    q3x = q[3].x, q3y = q[3].y;
    real    m00, m01, m02;
    real    m10, m11, m12;
    real    m20, m21, m22;

    m02 = q0x;
    m12 = q0y;
    m22 = 1;

    real    a = ((q2x - q3x)*(q1y - q2y) - (q2y - q3y)*(q1x - q2x)) * h;
    real    b = (q2x - q1x - q3x + q0x) * (q1y - q2y) - (q2y - q1y - q3y + q0y) * (q1x - q2x);
    m21 = - b / a;

    if (q1x != q2x)
	m20 = (m21 * (q2x - q3x) * h + q2x - q1x - q3x + q0x) / ((q1x - q2x) * w);
    else
	m20 = (m21 * (q2y - q3y) * h + q2y - q1y - q3y + q0y) / ((q1y - q2y) * w);

    m00 = m20 * q1x + (q1x - q0x) / w;
    m10 = m20 * q1y + (q1y - q0y) / w;

    m01 = m21 * q3x + (q3x - q0x) / h;
    m11 = m21 * q3y + (q3y - q0y) / h;

    return (m_t) {
	{ m00, m01, m02 },
	{ m10, m11, m12 },
	{ m20, m21, m22 } };
}

m_t
invert (m_t m)
{
    real  det;
    int	    i, j;
    m_t	r;

    static int[3]	a = { 2, 2, 1 };
    static int[3]	b = { 1, 0, 0 };

    det = 0;
    for (i = 0; i < 3; i++) {
	real	p;
	int	ai = a[i];
	int	bi = b[i];
	p = m[i,0] * (m[ai,2] * m[bi,1] - m[ai,1] * m[bi,2]);
	if (i == 1)
	    p = -p;
	det += p;
    }
    det = 1/det;
    for (j = 0; j < 3; j++) {
	for (i = 0; i < 3; i++) {
	    real  p;
	    int	    ai = a[i];
	    int	    aj = a[j];
	    int	    bi = b[i];
	    int	    bj = b[j];

	    p = m[ai,aj] * m[bi,bj] - m[ai,bj] * m[bi,aj];
	    if (((i + j) & 1) != 0)
		p = -p;
	    r[j,i] = det * p;
	}
    }
    return r;
}

m_t
rescale (m_t m, real limit)
{
    real    max = 0;
    for (int j = 0; j < 3; j++)
	for (int i = 0; i < 3; i++)
	    if ((real v = abs (m[j,i])) > max)
		max = v;
    real scale = limit / max;
    for (int j = 0; j < 3; j++)
	for (int i = 0; i < 3; i++)
	    m[j,i] *= scale;
    return m;
    
}

string
m_print (m_t m)
{

    return sprintf ("%.8f,%.8f,%.8f,%.8f,%.8f,%.8f,%.8f,%.8f,%.8f",
		    m[0,0],m[0,1],m[0,2],
		    m[1,0],m[1,1],m[1,2],
		    m[2,0],m[2,1],m[2,2]);
/*
    return sprintf ("%v,%v,%v,%v,%v,%v,%v,%v,%v",
		    m[0,0],m[0,1],m[0,2],
		    m[1,0],m[1,1],m[1,2],
		    m[2,0],m[2,1],m[2,2]);
*/
}

int
fixed (real x)
{
    return floor (x * 65536 + 0.5) & 0xffffffff;
}

m_t
to_fixed(m_t m)
{
    m_t r;

    for (int i = 0; i < 3; i++)
        for (int j = 0; j < 3; j++)
            r[i,j] = floor(m[i,j] * 65536 + 0.5) / 65536;
    return r;
}

m_t
error(m_t r, m_t f)
{
    m_t e;

    for (int i = 0; i < 3; i++)
        for (int j = 0; j < 3; j++) {
            real diff = abs(r[i,j] - f[i,j]);
            if (r[i,j] != 0)
                e[i,j] = diff / abs(r[i,j]);
            else
                e[i,j] = 0;
        }
    return e;
}

void
m_print_fix (m_t m)
{
    for (int i = 0; i < 3; i++)
    {
	printf (" { 0x%08x, 0x%08x, 0x%08x },\n",
		fixed (m[i,0]), fixed (m[i,1]), fixed (m[i,2]));
    }
}

real[2]
map(m_t m, real x, real y)
{
    real[3]     in = { x, y, 1 };
    real[3]     out = { 0 ... };

    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 3; j++)
            out[i] += m[i,j] * in[j];
    }
    return (real[2]) { out[0] / out[2], out[1]/ out[2] };
}

real
position_error(m_t r, m_t f, real x, real y)
{
    real[2]     p_r = map(r, x, y);
    real[2]     p_f = map(f, x, y);
    real        error;

    error = sqrt((p_r[0] - p_f[0]) ** 2 + (p_r[1] - p_f[1]) ** 2);
    printf ("x: %g y: %g error %g\n", x, y, error);
    printf ("\treal x: %g y: %g\n", p_r[0], p_r[1]);
    printf ("\tfix  x: %g y: %g\n", p_f[0], p_f[1]);
    return error;
}

real
max_error(m_t r, m_t f) {
    real        max = 0, max_x = 0, max_y = 0;

    for (int x = 0; x <= 2560; x += 2560)
        for (int y = 0; y <= 1600; y += 1600) {
            real error = position_error(r, f, x, y);
            if (error > max) {
                max = error;
                max_x = x;
                max_y = y;
            }
        }
    printf ("max error %g at %d, %d\n", max, max_x, max_y);
    real[2] p_r = map(r, max_x ,max_y);
    real[2] p_f = map(f, max_x, max_y);
    printf ("\tdesired %7.2f, %7.2f actual %7.2f, %7.2f\n",
            p_r[0], p_r[1],
            p_f[0], p_f[1]);
    return max;
}

string
m_row (m_t m, int row)
{
    return sprintf ("%10.5f %10.5f %10.5f",
		    m[row,0],m[row,1],m[row,2]);
}

Cairo::point_t[*] scale(Cairo::point_t[*] p, real w, real h)
{
    for (int i = 0; i < dim (p); i++) {
	p[i].x *= w;
	p[i].y *= h;
    }
    return p;
}

typedef struct {
    string  name;
    rect_t  geometry;
} output_t;

autoload Process;


output_t[*] get_outputs () {
    output_t[...]   outputs = {};
    twixt (file randr = Process::popen (Process::popen_direction.read,
					false, "xrandr", "xrandr");
	   File::close (randr))
    {
	while (!File::end (randr)) {
	    string[*] words = String::wordsplit (File::fgets (randr), " ");
	    if (dim (words) >= 3 && words[1] == "connected") {
                int     geom = 2;
                if (words[geom] == "primary")
                    geom++;
		if (File::sscanf (words[geom], "%dx%d+%d+%d", 
                                  &(int width), &(int height), 
                                  &(int x), &(int y)) == 4)
                {
                    outputs[dim(outputs)] = (output_t) {
                        name = words[0],
                        geometry = { 
                            x = x, y = y, width = width, height = height 
                        }
                    };
                }
            }
	}
    }
    return outputs;
}

void main ()
{
    m_t	m = { { 1, 0, 0 }, { 0, 1, 0 }, { 0, 0, 1 } }, m_i, m_r, m_f, m_e;
    bool m_available = true;
    output_t[*]	outputs = get_outputs ();
    output_t	target_output;

    if (dim (outputs) == 0) {
	File::fprintf (stderr, "%s: No enabled outputs\n", argv[0]);
	exit (1);
    }
    
    if (dim (argv) > 1) {
	int i;
	for (i = 0; i < dim (outputs); i++)
	    if (argv[1] == outputs[i].name) {
		target_output = outputs[i];
		break;
	    }
	if (i == dim (outputs)) {
	    File::fprintf (stderr, "%s: no enabled output \"%s\"\n",
			   argv[0], argv[1]);
	    exit (1);
	}
    }
    else
	target_output = outputs[0];
	
    real target_width = target_output.geometry.width;
    real target_height = target_output.geometry.height;
    
    real screen_width = 0;
    real screen_height = 0;

    for (int i = 0; i < dim (outputs); i++)
    {
	screen_width = max (screen_width, 
			    outputs[i].geometry.x +
			    outputs[i].geometry.width);
	screen_height = max (screen_height, 
			    outputs[i].geometry.y +
			    outputs[i].geometry.height);
    }

    &nichrome_t	nichrome = Nichrome::new ("Keystone Correction", 400, 350);

    (*label_t)[3]	label;
    &label_t	space = Label::new (&nichrome, "");
    for (int i = 0; i < 3; i++) {
	label[i] = Label::new (&nichrome, "matrix");
	label[i]->font = "sans-9";
    }

    void callback (&quad_t quad) {
	real	w = quad.geometry.width;
	real	h = quad.geometry.height;
	string[3]	text;
	try {
	    m = solve (scale (quad.p, target_width / w, target_height / h),
		       target_width, target_height);
	    m_i = invert (m);
	    m_r = rescale (m_i, 16384);
	    for (int i = 0; i < 3; i++)
		text[i] = m_row (m_i,i);
	    m_available = true;
	} catch divide_by_zero (real a, real b) {
	    text = (string[3]) { "no solution", "" ... };
	    m_available = false;
	}
	for (int i = 0; i < 3; i++)
	    Label::relabel (label[i], text[i]);
    }
    &quad_t	quad = Quad::new (&nichrome, callback);

    void doit_func (&widget_t widget, bool state)
    {
	if (m_available)
	{
	    Process::system ("xrandr",
			     "xrandr",
			     "--fb",
			     sprintf ("%dx%d", screen_width, screen_height),
			     "--output",
			     target_output.name,
			     "--transform",
			     m_print (m_r));
	}
    }

    &button_t	doit = Button::new (&nichrome, "doit", doit_func);
    
    void show_func (&widget_t widget, bool state)
    {
	if (m_available)
	{
	    printf ("normal:  %s\n", m_print (m));
	    printf ("inverse: %s\n", m_print (m_i));
	    printf ("scaled:  %s\n", m_print (m_r));
            m_f = to_fixed(m_r);
            printf ("round:   %s\n", m_print(m_f));
	    printf ("fixed:\n");
	    m_print_fix (m_i);
            m_e = error(m_r, m_f);
            printf ("error:   %s\n", m_print (m_e));
            max_error(m_r, m_f);
	}
    }
    
    &button_t	show = Button::new (&nichrome, "show", show_func);
    &button_t	quit = Button::new (&nichrome, "quit",
				     void func (&widget_t w, bool state) {
					w.nichrome.running = false;
				     });

    &box_t	hbox = Box::new (Box::dir_t.horizontal,
				 Box::widget_item (&doit, 0),
				 Box::widget_item (&show, 0),
				 Box::widget_item (&quit, 0),
				 Box::glue_item (1));
    &box_t	box = Box::new (Box::dir_t.vertical,
				Box::box_item (&hbox),
				Box::widget_item (label[0], 1, 0),
				Box::widget_item (label[1], 1, 0),
				Box::widget_item (label[2], 1, 0),
				Box::widget_item (&space, 1, 0),
				Box::widget_item (&quad, 1));
    Nichrome::set_box (&nichrome, &box);
    Nichrome::main_loop (&nichrome);
}

main ();