aboutsummaryrefslogtreecommitdiff
path: root/nexgb/composite/composite.go
blob: d1f19b96b7ae83179fa4a01f115df8903eb6d1b9 (plain)
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
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
// Package composite is the X client API for the Composite extension.
package composite

/*
	This file was generated by composite.xml on Jun 5 2012 12:11:58am EDT.
	This file is automatically generated. Edit at your peril!
*/

import (
	"github.com/BurntSushi/xgb"

	"github.com/BurntSushi/xgb/xfixes"
	"github.com/BurntSushi/xgb/xproto"
)

// Init must be called before using the Composite extension.
func Init(c *xgb.Conn) error {
	reply, err := xproto.QueryExtension(c, 9, "Composite").Reply()
	switch {
	case err != nil:
		return err
	case !reply.Present:
		return xgb.Errorf("No extension named Composite could be found on on the server.")
	}

	xgb.ExtLock.Lock()
	c.Extensions["Composite"] = reply.MajorOpcode
	for evNum, fun := range xgb.NewExtEventFuncs["Composite"] {
		xgb.NewEventFuncs[int(reply.FirstEvent)+evNum] = fun
	}
	for errNum, fun := range xgb.NewExtErrorFuncs["Composite"] {
		xgb.NewErrorFuncs[int(reply.FirstError)+errNum] = fun
	}
	xgb.ExtLock.Unlock()

	return nil
}

func init() {
	xgb.NewExtEventFuncs["Composite"] = make(map[int]xgb.NewEventFun)
	xgb.NewExtErrorFuncs["Composite"] = make(map[int]xgb.NewErrorFun)
}

// Skipping definition for base type 'Int32'

// Skipping definition for base type 'Void'

// Skipping definition for base type 'Byte'

// Skipping definition for base type 'Int8'

// Skipping definition for base type 'Card16'

// Skipping definition for base type 'Char'

// Skipping definition for base type 'Card32'

// Skipping definition for base type 'Double'

// Skipping definition for base type 'Bool'

// Skipping definition for base type 'Float'

// Skipping definition for base type 'Card8'

// Skipping definition for base type 'Int16'

const (
	RedirectAutomatic = 0
	RedirectManual    = 1
)

// QueryVersionCookie is a cookie used only for QueryVersion requests.
type QueryVersionCookie struct {
	*xgb.Cookie
}

// QueryVersion sends a checked request.
// If an error occurs, it will be returned with the reply by calling QueryVersionCookie.Reply()
func QueryVersion(c *xgb.Conn, ClientMajorVersion uint32, ClientMinorVersion uint32) QueryVersionCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'QueryVersion' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, true)
	c.NewRequest(queryVersionRequest(c, ClientMajorVersion, ClientMinorVersion), cookie)
	return QueryVersionCookie{cookie}
}

// QueryVersionUnchecked sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func QueryVersionUnchecked(c *xgb.Conn, ClientMajorVersion uint32, ClientMinorVersion uint32) QueryVersionCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'QueryVersion' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, true)
	c.NewRequest(queryVersionRequest(c, ClientMajorVersion, ClientMinorVersion), cookie)
	return QueryVersionCookie{cookie}
}

// QueryVersionReply represents the data returned from a QueryVersion request.
type QueryVersionReply struct {
	Sequence uint16 // sequence number of the request for this reply
	Length   uint32 // number of bytes in this reply
	// padding: 1 bytes
	MajorVersion uint32
	MinorVersion uint32
	// padding: 16 bytes
}

// Reply blocks and returns the reply data for a QueryVersion request.
func (cook QueryVersionCookie) Reply() (*QueryVersionReply, error) {
	buf, err := cook.Cookie.Reply()
	if err != nil {
		return nil, err
	}
	if buf == nil {
		return nil, nil
	}
	return queryVersionReply(buf), nil
}

// queryVersionReply reads a byte slice into a QueryVersionReply value.
func queryVersionReply(buf []byte) *QueryVersionReply {
	v := new(QueryVersionReply)
	b := 1 // skip reply determinant

	b += 1 // padding

	v.Sequence = xgb.Get16(buf[b:])
	b += 2

	v.Length = xgb.Get32(buf[b:]) // 4-byte units
	b += 4

	v.MajorVersion = xgb.Get32(buf[b:])
	b += 4

	v.MinorVersion = xgb.Get32(buf[b:])
	b += 4

	b += 16 // padding

	return v
}

// Write request to wire for QueryVersion
// queryVersionRequest writes a QueryVersion request to a byte slice.
func queryVersionRequest(c *xgb.Conn, ClientMajorVersion uint32, ClientMinorVersion uint32) []byte {
	size := 12
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["COMPOSITE"]
	b += 1

	buf[b] = 0 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], ClientMajorVersion)
	b += 4

	xgb.Put32(buf[b:], ClientMinorVersion)
	b += 4

	return buf
}

// RedirectWindowCookie is a cookie used only for RedirectWindow requests.
type RedirectWindowCookie struct {
	*xgb.Cookie
}

// RedirectWindow sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func RedirectWindow(c *xgb.Conn, Window xproto.Window, Update byte) RedirectWindowCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'RedirectWindow' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, false)
	c.NewRequest(redirectWindowRequest(c, Window, Update), cookie)
	return RedirectWindowCookie{cookie}
}

// RedirectWindowChecked sends a checked request.
// If an error occurs, it can be retrieved using RedirectWindowCookie.Check()
func RedirectWindowChecked(c *xgb.Conn, Window xproto.Window, Update byte) RedirectWindowCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'RedirectWindow' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, false)
	c.NewRequest(redirectWindowRequest(c, Window, Update), cookie)
	return RedirectWindowCookie{cookie}
}

// Check returns an error if one occurred for checked requests that are not expecting a reply.
// This cannot be called for requests expecting a reply, nor for unchecked requests.
func (cook RedirectWindowCookie) Check() error {
	return cook.Cookie.Check()
}

// Write request to wire for RedirectWindow
// redirectWindowRequest writes a RedirectWindow request to a byte slice.
func redirectWindowRequest(c *xgb.Conn, Window xproto.Window, Update byte) []byte {
	size := 12
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["COMPOSITE"]
	b += 1

	buf[b] = 1 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(Window))
	b += 4

	buf[b] = Update
	b += 1

	b += 3 // padding

	return buf
}

// RedirectSubwindowsCookie is a cookie used only for RedirectSubwindows requests.
type RedirectSubwindowsCookie struct {
	*xgb.Cookie
}

// RedirectSubwindows sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func RedirectSubwindows(c *xgb.Conn, Window xproto.Window, Update byte) RedirectSubwindowsCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'RedirectSubwindows' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, false)
	c.NewRequest(redirectSubwindowsRequest(c, Window, Update), cookie)
	return RedirectSubwindowsCookie{cookie}
}

// RedirectSubwindowsChecked sends a checked request.
// If an error occurs, it can be retrieved using RedirectSubwindowsCookie.Check()
func RedirectSubwindowsChecked(c *xgb.Conn, Window xproto.Window, Update byte) RedirectSubwindowsCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'RedirectSubwindows' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, false)
	c.NewRequest(redirectSubwindowsRequest(c, Window, Update), cookie)
	return RedirectSubwindowsCookie{cookie}
}

// Check returns an error if one occurred for checked requests that are not expecting a reply.
// This cannot be called for requests expecting a reply, nor for unchecked requests.
func (cook RedirectSubwindowsCookie) Check() error {
	return cook.Cookie.Check()
}

// Write request to wire for RedirectSubwindows
// redirectSubwindowsRequest writes a RedirectSubwindows request to a byte slice.
func redirectSubwindowsRequest(c *xgb.Conn, Window xproto.Window, Update byte) []byte {
	size := 12
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["COMPOSITE"]
	b += 1

	buf[b] = 2 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(Window))
	b += 4

	buf[b] = Update
	b += 1

	b += 3 // padding

	return buf
}

// UnredirectWindowCookie is a cookie used only for UnredirectWindow requests.
type UnredirectWindowCookie struct {
	*xgb.Cookie
}

// UnredirectWindow sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func UnredirectWindow(c *xgb.Conn, Window xproto.Window, Update byte) UnredirectWindowCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'UnredirectWindow' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, false)
	c.NewRequest(unredirectWindowRequest(c, Window, Update), cookie)
	return UnredirectWindowCookie{cookie}
}

// UnredirectWindowChecked sends a checked request.
// If an error occurs, it can be retrieved using UnredirectWindowCookie.Check()
func UnredirectWindowChecked(c *xgb.Conn, Window xproto.Window, Update byte) UnredirectWindowCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'UnredirectWindow' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, false)
	c.NewRequest(unredirectWindowRequest(c, Window, Update), cookie)
	return UnredirectWindowCookie{cookie}
}

// Check returns an error if one occurred for checked requests that are not expecting a reply.
// This cannot be called for requests expecting a reply, nor for unchecked requests.
func (cook UnredirectWindowCookie) Check() error {
	return cook.Cookie.Check()
}

// Write request to wire for UnredirectWindow
// unredirectWindowRequest writes a UnredirectWindow request to a byte slice.
func unredirectWindowRequest(c *xgb.Conn, Window xproto.Window, Update byte) []byte {
	size := 12
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["COMPOSITE"]
	b += 1

	buf[b] = 3 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(Window))
	b += 4

	buf[b] = Update
	b += 1

	b += 3 // padding

	return buf
}

// UnredirectSubwindowsCookie is a cookie used only for UnredirectSubwindows requests.
type UnredirectSubwindowsCookie struct {
	*xgb.Cookie
}

// UnredirectSubwindows sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func UnredirectSubwindows(c *xgb.Conn, Window xproto.Window, Update byte) UnredirectSubwindowsCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'UnredirectSubwindows' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, false)
	c.NewRequest(unredirectSubwindowsRequest(c, Window, Update), cookie)
	return UnredirectSubwindowsCookie{cookie}
}

// UnredirectSubwindowsChecked sends a checked request.
// If an error occurs, it can be retrieved using UnredirectSubwindowsCookie.Check()
func UnredirectSubwindowsChecked(c *xgb.Conn, Window xproto.Window, Update byte) UnredirectSubwindowsCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'UnredirectSubwindows' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, false)
	c.NewRequest(unredirectSubwindowsRequest(c, Window, Update), cookie)
	return UnredirectSubwindowsCookie{cookie}
}

// Check returns an error if one occurred for checked requests that are not expecting a reply.
// This cannot be called for requests expecting a reply, nor for unchecked requests.
func (cook UnredirectSubwindowsCookie) Check() error {
	return cook.Cookie.Check()
}

// Write request to wire for UnredirectSubwindows
// unredirectSubwindowsRequest writes a UnredirectSubwindows request to a byte slice.
func unredirectSubwindowsRequest(c *xgb.Conn, Window xproto.Window, Update byte) []byte {
	size := 12
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["COMPOSITE"]
	b += 1

	buf[b] = 4 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(Window))
	b += 4

	buf[b] = Update
	b += 1

	b += 3 // padding

	return buf
}

// CreateRegionFromBorderClipCookie is a cookie used only for CreateRegionFromBorderClip requests.
type CreateRegionFromBorderClipCookie struct {
	*xgb.Cookie
}

// CreateRegionFromBorderClip sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func CreateRegionFromBorderClip(c *xgb.Conn, Region xfixes.Region, Window xproto.Window) CreateRegionFromBorderClipCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'CreateRegionFromBorderClip' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, false)
	c.NewRequest(createRegionFromBorderClipRequest(c, Region, Window), cookie)
	return CreateRegionFromBorderClipCookie{cookie}
}

// CreateRegionFromBorderClipChecked sends a checked request.
// If an error occurs, it can be retrieved using CreateRegionFromBorderClipCookie.Check()
func CreateRegionFromBorderClipChecked(c *xgb.Conn, Region xfixes.Region, Window xproto.Window) CreateRegionFromBorderClipCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'CreateRegionFromBorderClip' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, false)
	c.NewRequest(createRegionFromBorderClipRequest(c, Region, Window), cookie)
	return CreateRegionFromBorderClipCookie{cookie}
}

// Check returns an error if one occurred for checked requests that are not expecting a reply.
// This cannot be called for requests expecting a reply, nor for unchecked requests.
func (cook CreateRegionFromBorderClipCookie) Check() error {
	return cook.Cookie.Check()
}

// Write request to wire for CreateRegionFromBorderClip
// createRegionFromBorderClipRequest writes a CreateRegionFromBorderClip request to a byte slice.
func createRegionFromBorderClipRequest(c *xgb.Conn, Region xfixes.Region, Window xproto.Window) []byte {
	size := 12
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["COMPOSITE"]
	b += 1

	buf[b] = 5 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(Region))
	b += 4

	xgb.Put32(buf[b:], uint32(Window))
	b += 4

	return buf
}

// NameWindowPixmapCookie is a cookie used only for NameWindowPixmap requests.
type NameWindowPixmapCookie struct {
	*xgb.Cookie
}

// NameWindowPixmap sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func NameWindowPixmap(c *xgb.Conn, Window xproto.Window, Pixmap xproto.Pixmap) NameWindowPixmapCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'NameWindowPixmap' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, false)
	c.NewRequest(nameWindowPixmapRequest(c, Window, Pixmap), cookie)
	return NameWindowPixmapCookie{cookie}
}

// NameWindowPixmapChecked sends a checked request.
// If an error occurs, it can be retrieved using NameWindowPixmapCookie.Check()
func NameWindowPixmapChecked(c *xgb.Conn, Window xproto.Window, Pixmap xproto.Pixmap) NameWindowPixmapCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'NameWindowPixmap' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, false)
	c.NewRequest(nameWindowPixmapRequest(c, Window, Pixmap), cookie)
	return NameWindowPixmapCookie{cookie}
}

// Check returns an error if one occurred for checked requests that are not expecting a reply.
// This cannot be called for requests expecting a reply, nor for unchecked requests.
func (cook NameWindowPixmapCookie) Check() error {
	return cook.Cookie.Check()
}

// Write request to wire for NameWindowPixmap
// nameWindowPixmapRequest writes a NameWindowPixmap request to a byte slice.
func nameWindowPixmapRequest(c *xgb.Conn, Window xproto.Window, Pixmap xproto.Pixmap) []byte {
	size := 12
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["COMPOSITE"]
	b += 1

	buf[b] = 6 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(Window))
	b += 4

	xgb.Put32(buf[b:], uint32(Pixmap))
	b += 4

	return buf
}

// GetOverlayWindowCookie is a cookie used only for GetOverlayWindow requests.
type GetOverlayWindowCookie struct {
	*xgb.Cookie
}

// GetOverlayWindow sends a checked request.
// If an error occurs, it will be returned with the reply by calling GetOverlayWindowCookie.Reply()
func GetOverlayWindow(c *xgb.Conn, Window xproto.Window) GetOverlayWindowCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'GetOverlayWindow' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, true)
	c.NewRequest(getOverlayWindowRequest(c, Window), cookie)
	return GetOverlayWindowCookie{cookie}
}

// GetOverlayWindowUnchecked sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func GetOverlayWindowUnchecked(c *xgb.Conn, Window xproto.Window) GetOverlayWindowCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'GetOverlayWindow' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, true)
	c.NewRequest(getOverlayWindowRequest(c, Window), cookie)
	return GetOverlayWindowCookie{cookie}
}

// GetOverlayWindowReply represents the data returned from a GetOverlayWindow request.
type GetOverlayWindowReply struct {
	Sequence uint16 // sequence number of the request for this reply
	Length   uint32 // number of bytes in this reply
	// padding: 1 bytes
	OverlayWin xproto.Window
	// padding: 20 bytes
}

// Reply blocks and returns the reply data for a GetOverlayWindow request.
func (cook GetOverlayWindowCookie) Reply() (*GetOverlayWindowReply, error) {
	buf, err := cook.Cookie.Reply()
	if err != nil {
		return nil, err
	}
	if buf == nil {
		return nil, nil
	}
	return getOverlayWindowReply(buf), nil
}

// getOverlayWindowReply reads a byte slice into a GetOverlayWindowReply value.
func getOverlayWindowReply(buf []byte) *GetOverlayWindowReply {
	v := new(GetOverlayWindowReply)
	b := 1 // skip reply determinant

	b += 1 // padding

	v.Sequence = xgb.Get16(buf[b:])
	b += 2

	v.Length = xgb.Get32(buf[b:]) // 4-byte units
	b += 4

	v.OverlayWin = xproto.Window(xgb.Get32(buf[b:]))
	b += 4

	b += 20 // padding

	return v
}

// Write request to wire for GetOverlayWindow
// getOverlayWindowRequest writes a GetOverlayWindow request to a byte slice.
func getOverlayWindowRequest(c *xgb.Conn, Window xproto.Window) []byte {
	size := 8
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["COMPOSITE"]
	b += 1

	buf[b] = 7 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(Window))
	b += 4

	return buf
}

// ReleaseOverlayWindowCookie is a cookie used only for ReleaseOverlayWindow requests.
type ReleaseOverlayWindowCookie struct {
	*xgb.Cookie
}

// ReleaseOverlayWindow sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func ReleaseOverlayWindow(c *xgb.Conn, Window xproto.Window) ReleaseOverlayWindowCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'ReleaseOverlayWindow' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, false)
	c.NewRequest(releaseOverlayWindowRequest(c, Window), cookie)
	return ReleaseOverlayWindowCookie{cookie}
}

// ReleaseOverlayWindowChecked sends a checked request.
// If an error occurs, it can be retrieved using ReleaseOverlayWindowCookie.Check()
func ReleaseOverlayWindowChecked(c *xgb.Conn, Window xproto.Window) ReleaseOverlayWindowCookie {
	if _, ok := c.Extensions["COMPOSITE"]; !ok {
		panic("Cannot issue request 'ReleaseOverlayWindow' using the uninitialized extension 'Composite'. composite.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, false)
	c.NewRequest(releaseOverlayWindowRequest(c, Window), cookie)
	return ReleaseOverlayWindowCookie{cookie}
}

// Check returns an error if one occurred for checked requests that are not expecting a reply.
// This cannot be called for requests expecting a reply, nor for unchecked requests.
func (cook ReleaseOverlayWindowCookie) Check() error {
	return cook.Cookie.Check()
}

// Write request to wire for ReleaseOverlayWindow
// releaseOverlayWindowRequest writes a ReleaseOverlayWindow request to a byte slice.
func releaseOverlayWindowRequest(c *xgb.Conn, Window xproto.Window) []byte {
	size := 8
	b := 0
	buf := make([]byte, size)

	buf[b] = c.Extensions["COMPOSITE"]
	b += 1

	buf[b] = 8 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(Window))
	b += 4

	return buf
}