File: randrproto.txt

package info (click to toggle)
xorgproto 2018.4-4
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 3,112 kB
  • sloc: ansic: 28,526; sh: 3,671; makefile: 445; cpp: 397
file content (3430 lines) | stat: -rw-r--r-- 111,007 bytes parent folder | download
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
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
	       The X Resize, Rotate and Reflect Extension
			     Version 1.6.0
			       2017-04-01

			      Jim Gettys
			   Jim.Gettys@hp.com
		     Cambridge Research Laboratory
				HP Labs
			Hewlett Packard Company

			     Keith Packard
			  keithp@keithp.com

1. Introduction

The X Resize, Rotate and Reflect Extension, called RandR for short,
brings the ability to resize, rotate and reflect the root window of a
screen. It is based on the X Resize and Rotate Extension as specified
in the Proceedings of the 2001 Usenix Technical Conference [RANDR].

RandR as implemented and integrated into the X server differs in
one substantial fashion from the design discussed in that paper: that
is, RandR 1.0 does not implement the depth switching described in that
document, and the support described for that in the protocol in that
document and in the implementation has been removed from the
protocol described here, as it has been overtaken by events.

These events include:
      ► Modern toolkits (in this case, GTK+ 2.x) have progressed to the point
	of implementing migration between screens of arbitrary depths
      ► The continued advance of Moore's law has made limited amounts of VRAM
	less of an issue, reducing the pressure to implement depth switching
	on laptops or desktop systems
      ► The continued decline of legacy toolkits whose design would have
	required depth switching to support migration
      ► The lack of depth switching implementation experience in the
	intervening time, due to events beyond our control

Additionally, the requirement to support depth switching might
complicate other re-engineering of the device independent part of the
X server that is currently being contemplated.

Rather than further delaying RandR's widespread deployment for a feature
long wanted by the community (resizing of screens, particularly on laptops),
or the deployment of a protocol design that might be flawed due to lack of
implementation experience, we decided to remove depth switching from the
protocol. It may be implemented at a later time if resources and
interests permit as a revision to the protocol described here, which will
remain a stable base for applications. The protocol described here has been
implemented in the main X.org server, and more fully in the hw/kdrive
implementation in the distribution, which fully implements resizing,
rotation and reflection.

1.2 Introduction to version 1.2 of the extension

One of the significant limitations found in version 1.1 of the RandR
protocol was the inability to deal with the Xinerama model where multiple
monitors display portions of a common underlying screen. In this environment,
zero or more video outputs are associated with each CRT controller which
defines both a set of video timings and a 'viewport' within the larger
screen. This viewport is independent of the overall size of the screen, and
may be located anywhere within the screen.

The effect is to decouple the reported size of the screen from the size
presented by each video output, and to permit multiple outputs to present
information for a single screen.

To extend RandR for this model, we separate out the output, CRTC and screen
configuration information and permit them to be configured separately. For
compatibility with the 1.1 version of the protocol, we make the 1.1 requests
simultaneously affect both the screen and the (presumably sole) CRTC and
output. The set of available outputs are presented with UTF-8 encoded names
and may be connected to CRTCs as permitted by the underlying hardware. CRTC
configuration is now done with full mode information instead of just size
and refresh rate, and these modes have names. These names also use UTF-8
encoding. New modes may also be added by the user.

Additional requests and events are provided for this new functionality.

       ┌────────────────────────────────┬──────────┐
    ┏━━━━━━━┳───────────────┐       ╔════════╗ ╔════════╗
    ┃   1   ┃               │       ║   A    ║ ║   B    ║
    ┃   ┏━━━╋━━━━━━━━━━━━━━━┫       ║        ║ ║        ║
    ┣━━━╋━━━┛               ┃       ╚════════╝ ╚════════╝
    │   ┃         2         ┃─────────────────┐
    │   ┃                   ┃        ╔═══════════════════╗
    │   ┃                   ┃        ║                   ║
    │   ┗━━━━━━━━━━━━━━━━━━━┫        ║        C          ║
    └───────────────────────┘        ║                   ║
    ┌──────┐  ┏━━━━┓  ╔══════╗       ║                   ║
    │screen│  ┃CRTC┃  ║output║       ╚═══════════════════╝
    └──────┘  ┗━━━━┛  ╚══════╝

In this picture, the screen is covered (incompletely) by two CRTCs. CRTC1
is connected to two outputs, A and B. CRTC2 is connected to output C.
Outputs A and B will present exactly the same region of the screen using
the same mode line. Output C will present a different (larger) region of
the screen using a different mode line.

RandR provides information about each available CRTC and output; the
connection between CRTC and output is under application control, although
the hardware will probably impose restrictions on the possible
configurations. The protocol doesn't try to describe these restrictions,
instead it provides a mechanism to find out what combinations are supported.

1.3 Introduction to version 1.3 of the extension

Version 1.3 builds on the changes made with version 1.2 and adds some new
capabilities without fundamentally changing the extension again. The
following features are added in this version:

   • Projective Transforms. The implementation work for general rotation
     support made it trivial to add full projective transformations. These
     can be used to scale the screen up/down as well as perform projector
     keystone correct or other effects.

   • Panning. It was removed with RandR 1.2 because the old semantics didn't
     fit any longer. With RandR 1.3 panning can be specified per crtc.

1.4 Introduction to version 1.4 of the extension

Version 1.4 adds an optional Border property.

   • An optional Border property. This property allows a client to
     specify that the viewport of the CRTC is smaller than the active
     display region described its mode.  This is useful, for example,
     for compensating for the overscan behavior of certain
     televisions.

Version 1.4 adds a new object called a provider object. A provider object
represents a GPU or virtual device providing services to the X server.
Providers have a set of abilities and a set of possible roles.

Provider objects are used to control multi-GPU systems. Provider roles can
be dynamically configured to provide support for:

 1) Output slaving: plug in a USB device, but have its output rendered
 using the main GPU. On some dual-GPU laptops, the second GPU isn't
 connected to the LVDS panel, so we need to use the first GPU as an output
 slave for the second GPU. 

 2) offload - For dual-GPU laptops, allow direct rendered applications to be run
 on the second GPU and display on the first GPU.

 3) GPU switching - Allow switching between two GPUs as the main screen
 renderer.

 4) multiple GPU rendering - This replaces Xinerama.

1.5. Introduction to version 1.5 of the extension

Version 1.5 adds an optional TILE property to outputs.

   • An optional TILE property.
     This property is used to denote individual tiles in a tiled monitor
     configuration, as exposed via DisplayID v1.3.

Version 1.5 adds monitors

 • A 'Monitor' is a rectangular subset of the screen which represents
   a coherent collection of pixels presented to the user.

 • Each Monitor is associated with a list of outputs (which may be
   empty).

 • When clients define monitors, the associated outputs are removed from
   existing Monitors. If removing the output causes the list for that
   monitor to become empty, that monitor will be deleted.

 • For active CRTCs that have no output associated with any
   client-defined Monitor, one server-defined monitor will
   automatically be defined of the first Output associated with them.

 • When defining a monitor, setting the geometry to all zeros will
   cause that monitor to dynamically track the bounding box of the
   active outputs associated with them

This new object separates the physical configuration of the hardware
from the logical subsets of the screen that applications should
consider as single viewable areas.

1.5.1. Relationship between Monitors and Xinerama

Xinerama's information now comes from the Monitors instead of directly
from the CRTCs. The Monitor marked as Primary will be listed first.

1.5.2. Clarification of Output lifetimes

With dynamic connectors being a possibility with the introduction of
DisplayPort multistream (MST), a lot of RandR clients can't handle the
XID BadMatch when a RandR output disappears. This is to clarify that
going forward the X server will not remove outputs dynamically,
just mark them as disconnected.

1.6. Introduction to version 1.6 of the extension

Version 1.6 adds resource leasing and non desktop output management.

 • A “Lease” is a collection of crtcs and outputs which are made
   available to a client for direct access via kernel KMS and DRM
   APIs. This is done by passing a suitable file descriptor back to
   the client which has access to those resources. While leased, those
   resources aren't used by the X server.

 • A “non-desktop” output is a device which should not normally be
   considered as part of the desktop environment. Head-mounted
   displays and the Apple "Touch Bar" are examples of such
   devices. A desktop environment should be able to discover which
   outputs are connected to such devices and, by default, not present
   normal desktop applications on them. This is done by having
   RRGetOutputInfo report such devices as Disconnected while reporting
   all other information about the device correctly.

1.99 Acknowledgments

Our thanks to the contributors to the design found on the xpert mailing
list, in particular:

Alan Hourihane for work on the early implementation
Andrew C. Aitchison for help with the XFree86 DDX implementation
Andy Ritger for early questions about how mergefb/Xinerama work with RandR
Carl Worth for editing the specification and Usenix paper
David Dawes for XFree86 DDX integration work
Thomas Winischhofer for the hardware-accelerated SiS rotation implementation
Matthew Tippett and Kevin Martin for splitting outputs and CRTCs to more
fully expose what video hardware can do
Dave Airlie for the 1.4.0 protocol changes and for working through the
implications of MST monitors and encouraging the introduction of the
'Monitor' concept.

			      ❧❧❧❧❧❧❧❧❧❧❧

2. Screen change model

Screens may change dynamically, either under control of this extension, or
due to external events. Examples include: monitors being swapped, pressing a
button to switch from internal display to an external monitor on a laptop,
or, eventually, the hotplug of a display card entirely on buses such as
Cardbus or Express Card which permit hot-swap (which will require other work
in addition to this extension).

Since the screen configuration is dynamic and asynchronous to the client and
may change at any time RandR provides mechanisms to ensure that your clients
view is up to date with the configuration possibilities of the moment and
enforces applications that wish to control the configuration to prove that
their information is up to date before honoring requests to change the
screen configuration (by requiring a timestamp on the request).

Interested applications are notified whenever the screen configuration
changes, providing the current size of the screen and subpixel order (see
the Render extension [RENDER]), to enable proper rendering of subpixel
decimated client text to continue, along with a time stamp of the
configuration change. A client must refresh its knowledge of the screen
configuration before attempting to change the configuration after a
notification, or the request will fail.

To avoid multiplicative explosion between orientation, reflection and sizes,
the sizes are only those sizes in the normal (0) rotation.

Rotation and reflection and how they interact can be confusing. In Randr,
the coordinate system is rotated in a counter-clockwise direction relative
to the normal orientation. Reflection is along the window system coordinate
system, not the physical screen X and Y axis, so that rotation and
reflection do not interact. The other way to consider reflection is to is
specified in the "normal" orientation, before rotation, if you find the
other way confusing.

We expect that most clients and toolkits will be oblivious to changes to the
screen structure, as they generally use the values in the connections Display
structure directly. By toolkits updating the values on the fly, we believe
pop-up menus and other pop up windows will position themselves correctly in
the face of screen configuration changes (the issue is ensuring that pop-ups
are visible on the reconfigured screen).

			      ❧❧❧❧❧❧❧❧❧❧❧

3. Data Types

The subpixel order and transform data types are shared with the Render
extension, and are documented there.

The only datatype defined in the original extension is the screen size,
defined in the normal (0 degree) orientation.  Several more are added
in later revisions.

			      ❧❧❧❧❧❧❧❧❧❧❧

4. Errors

Errors are sent using core X error reports.

Output
	A value for an OUTPUT argument does not name a defined OUTPUT.
CRTC
	A value for a CRTC argument does not name a defined CRTC.
Mode
	A value for a MODE argument does not name a defined MODE.
Provider
	A value for a PROVIDER argument does not name a defined PROVIDER.
Lease
	A value for a LEASE argument does not name a defined LEASE

			      ❧❧❧❧❧❧❧❧❧❧❧

5. Protocol Types

RRCONFIGSTATUS { Success
		 InvalidConfigTime
		 InvalidTime
		 Failed }

	A value of type RRCONFIGSTATUS returned when manipulating the output
	configuration or querying information from the server that has some
	time-dependency.

	InvalidConfigTime indicates that the supplied configuration
	timestamp does not match the current X server configuration
	timestamp. Usually this means that the output configuration has
	changed since the timestamp was received by the application.

	InvalidTime indicates that the supplied output reconfiguration time
	is earlier than the most recent output reconfiguration request.
	Generally this indicates that another application has reconfigured
	the output using a later timestamp.

	Failed is returned whenever the operation is unsuccessful for some
	other reason. This generally indicates that the requested output
	configuration is unsupported by the hardware. The goal is to make
	these limitations expressed by the protocol, but when that isn't
	possible it is correct to return this error value. If, as a
	implementer, you find this error code required, please submit the
	hardware constraints that exist so that a future version of the
	extension can correctly capture the configuration constraints in
	your system.

ROTATION { Rotate_0
	   Rotate_90
	   Rotate_180
	   Rotate_270
	   Reflect_X
	   Reflect_Y }

	These values are used both to indicate a set of allowed rotations
	and reflections as well as to indicate a specific rotation and
	reflection combination.

RRSELECTMASK { RRScreenChangeNotifyMask
	       RRCrtcChangeNotifyMask (New in version 1.2)
	       RROutputChangeNotifyMask (New in version 1.2)
	       RROutputPropertyNotifyMask (New in version 1.2)
	       RRProviderChangeNotifyMask (New in version 1.4)
	       RRProviderPropertyNotifyMask (New in version 1.4)
	       RRResourceChangeNotifyMask (New in version 1.4) }

SIZEID { CARD16 }

MODE { XID or None }

CRTC { XID }

OUTPUT { XID }

CONNECTION { Connected, Disconnected, UnknownConnection }

	This value provides an indication of whether an output is actually
	connected to a monitor or other presentation device.


SCREENSIZE [ widthInPixels, heightInPixels: CARD16
	     widthInMillimeters, heightInMillimeters: CARD16 ]

MODEFLAG { HSyncPositive
	   HSyncNegative
	   VSyncPositive
	   VSyncNegative
	   Interlace
	   DoubleScan
	   CSync
	   CSyncPositive
	   CSyncNegative
	   HSkewPresent
	   BCast
	   PixelMultiplex
	   DoubleClock
	   ClockDivideBy2 }

MODEINFO [ id: MODE
	   name: STRING
	   width, height: CARD16
	   dotClock: CARD32
	   hSyncStart, hSyncEnd, hTotal, hSkew: CARD16
	   vSyncStart, vSyncEnd, vTotal: CARD16
	   modeFlags: SETofMODEFLAG ]

REFRESH [ rates: LISTofCARD16 ]

			      ❧❧❧❧❧❧❧❧❧❧❧

5.1 Data Types defined by the Render extension

These data types use the Render extension definitions; they are shown here
only for convenience:

SUBPIXELORDER { SubPixelUnknown
		SubPixelHorizontalRGB
		SubPixelHorizontalBGR
		SubPixelVerticalRGB
		SubPixelVerticalBGR
		SubPixelNone }

FIXED         32-bit value (top 16 are integer portion, bottom 16 are fraction)

TRANSFORM     [
                        p11, p12, p13:  FIXED
                        p21, p22, p23:  FIXED
                        p31, p32, p33:  FIXED
              ]

			      ❧❧❧❧❧❧❧❧❧❧❧

5.5. Protocol Types added in version 1.4 of the extension

PROVIDER { XID }

PROVIDER_CAPS { SourceOutput, SinkOutput, SourceOffload, SinkOffload }
	Capabilities for this provider:
	SourceOutput: This device can source output buffers.
	SinkOutput: This device can sink output buffers.
	SourceOffload: This device can source offload buffers.
	SinkOffload: This device can sink offload buffers.

			      ❧❧❧❧❧❧❧❧❧❧❧

5.6. Protocol Types added in version 1.5 of the extension

MONITORINFO { name: ATOM
              primary: BOOL
	      automatic: BOOL
	      x: INT16
	      y: INT16
	      width: CARD16
	      height: CARD16
	      width-in-millimeters: CARD32
	      height-in-millimeters: CARD32
	      outputs: LISTofOUTPUT }

			      ❧❧❧❧❧❧❧❧❧❧❧

5.7. Protocol Types added in version 1.6 of the extension

LEASE { XID }

			      ❧❧❧❧❧❧❧❧❧❧❧

6. Extension Initialization

The name of this extension is "RANDR".

┌───
    RRQueryVersion
	client-major-version:	CARD32
	client-minor-version:	CARD32
	major-version:		CARD32
	minor-version:		CARD32
└───

	The client sends the highest supported version to the server
	and the server sends the highest version it supports, but no
	higher than the requested version. Major versions changes can
	introduce incompatibilities in existing functionality, minor
	version changes introduce only backward compatible changes.
	It is the clients responsibility to ensure that the server
	supports a version which is compatible with its expectations.

			      ❧❧❧❧❧❧❧❧❧❧❧

7. Extension Requests

┌───
    RRSelectInput
	window: WINDOW
	enable: SETofRRSELECTMASK
└───
	Errors: Window, Value

	If 'enable' is RRScreenChangeNotifyMask, RRScreenChangeNotify events
	will be sent when the screen configuration changes, either from
	this protocol extension, or due to detected external screen
	configuration changes. RRScreenChangeNotify may also be sent when
	this request executes if the screen configuration has changed since
	the client connected, to avoid race conditions.

	New for version 1.2:

	If 'enable' contains RRCrtcChangeNotifyMask, RRCrtcChangeNotify events
	will be sent when the configuration for a CRTC associated with the
	screen changes, either through this protocol extension or due to
	detected external changes. RRCrtcChangeNotify may also be sent when
	this request executes if the CRTC configuration has changed since
	the client connected, to avoid race conditions.

	If 'enable' contains RROutputChangeNotifyMask, RROutputChangeNotify
	events will be sent when the configuration for an output associated with
	the screen changes, either through this protocol extension or due to
	detected external changes. RROutputChangeNotify may also be sent when
	this request executes if the output configuration has changed since the
	client connected, to avoid race conditions.

	If 'enable' contains RROutputPropertyNotifyMask,
	RROutputPropertyNotify events will be sent when properties change on
	this output.

	New for version 1.4:

	If 'enable' contains RRProviderChangeNotifyMask,
	RRProviderChangeNotify events will be sent whenever the role for a
	provider object has changed.

	If 'enable' contains RRProviderPropertyNotifyMask,
	RRProviderPropertyNotify events will be sent when properties change
	on a provider object.

	If 'enable' contains RRResourceChangeNotifyMask,
	RRResourceChangeNotify events will be sent whenever the set of
	available RandR resources associated with the screen has changed.

┌───
    RRSetScreenConfig
	window: WINDOW
	timestamp: TIMESTAMP
	config-timestamp: TIMESTAMP
	size-id: SIZEID
	rotation: ROTATION
	rate: CARD16
	status: RRCONFIGSTATUS
	new-timestamp: TIMESTAMP
	config-timestamp: TIMESTAMP
	root: WINDOW
	subpixelOrder: SUBPIXELORDER
└───
	Errors: Value, Match

	If 'timestamp' is less than the time when the configuration was last
	successfully set, the request is ignored and InvalidTime returned in
	status.

	If 'config-timestamp' is not equal to when the server's screen
	configurations last changed, the request is ignored and
	InvalidConfigTime returned in status. This could occur if the
	screen changed since you last made a RRGetScreenInfo request,
	perhaps by a different piece of display hardware being installed.
	Rather than allowing an incorrect call to be executed based on stale
	data, the server will ignore the request.

	'rate' contains the desired refresh rate. If it is zero, the server
	selects an appropriate rate.

	This request may fail for other indeterminate reasons, in which case
	'status' will be set to Failed and no configuration change will be
	made.

	This request sets the screen to the specified size, rate, rotation
	and reflection.

	When this request succeeds, 'status' contains Success and the
	requested changes to configuration will have been made.

	'new-time-stamp' contains the time at which this request was
	executed.

	'config-timestamp' contains the time when the possible screen
	configurations were last changed.

	'root' contains the root window for the screen indicated by the
	window.

	'subpixelOrder' contains the resulting subpixel order of the screen
	to allow correct subpixel rendering.

	Value errors are generated when 'rotation', 'rate' or 'size-id'
	are invalid.

┌───
    RRGetScreenInfo
	window: WINDOW
	rotations: SETofROTATION
	root: WINDOW
	timestamp: TIMESTAMP
	config-timestamp: TIMESTAMP
	size-id: SIZEID
	rotation: ROTATION
	rate: CARD16
	sizes: LISTofSCREENSIZE
	refresh: LISTofREFRESH
└───

	Errors: Window

	RRGetScreenInfo returns information about the current and available
	configurations for the screen associated with 'window'.

	'rotations' contains the set of rotations and reflections supported
	by the screen.

	'root' is the root window of the screen.

	'config-timestamp' indicates when the screen configuration
	information last changed: requests to set the screen will fail
	unless the timestamp indicates that the information the client
	is using is up to date, to ensure clients can be well behaved
	in the face of race conditions.

	'timestamp' indicates when the configuration was last set.

	'size-id' indicates which size is active.

	'rate' is the current refresh rate. This is zero when the refresh
	rate is unknown or on devices for which refresh is not relevant.

	'sizes' is the list of possible frame buffer sizes (at the normal
	orientation). Each size indicates both the linear physical size of
	the screen and the pixel size.

	'refresh' is the list of refresh rates for each size. Each element
	of 'sizes' has a corresponding element in 'refresh'. An empty list
	indicates no known rates, or a device for which refresh is not
	relevant.

	The default size of the screen (the size that would become the
	current size when the server resets) is the first size in the
	list.

7.1. Extension Requests added in version 1.2 of the extension

As introduced above, version 1.2 of the extension splits the screen size
from the crtc and output configuration, permitting the subset of the screen
presented by multiple outputs to be configured. As a separate notion, the
size of the screen itself may be arbitrarily configured within a defined
range. As crtcs and outputs are added and removed from the system, the set
returned by the extension will change so that applications can detect
dynamic changes in the display environment.

┌───
    RRGetScreenSizeRange
	window: WINDOW
	CARD16	minWidth, minHeight
	CARD16	maxWidth, maxHeight
└───
	Errors: Window

	Returns the range of possible screen sizes. The screen may be set to
	any size within this range.

┌───
    RRSetScreenSize
	window: WINDOW
	width: CARD16
	height: CARD16
	width-in-millimeters: CARD32
	height-in-millimeters: CARD32
└───
	Errors: Window, Match, Value

	Sets the screen to the specified size. 'width' and 'height' must be
	within the range allowed by GetScreenSizeRanges, otherwise a Value
	error results. All active monitors must be configured to display a
	subset of the specified size, else a Match error results.

	'width-in-millimeters' and 'height-in-millimeters' can be set to
	reflect the physical size of the screen reported both through this
	extension and the core protocol. They must be non-zero, or Value
	error results.

	If panning is enabled, the width and height of the panning and the
	tracking areas are adapted to the new size and clamped afterwards.
	Disabled panning axes remain disabled.
	Panning borders are disabled if their requirements are no longer met
	(see RRSetPanning).

┌───
    RRGetScreenResources
	window: WINDOW
	timestamp: TIMESTAMP
	config-timestamp: TIMESTAMP
	crtcs: LISTofCRTC
	outputs: LISTofOUTPUT
	modes: LISTofMODEINFO
└───
	Errors: Window

	RRGetScreenResources returns the list of outputs and crtcs connected
	to the screen associated with 'window'.

	'timestamp' indicates when the configuration was last set.

	'config-timestamp' indicates when the configuration information last
	changed. Requests to configure the output will fail unless the
	timestamp indicates that the information the client is using is up
	to date, to ensure clients can be well behaved in the face of race
	conditions.

	'crtcs' contains the list of CRTCs associated with the screen.

	'outputs' contains the list of outputs associated with the screen.

	'modes' contains the list of modes associated with the screen

	This request explicitly asks the server to ensure that the
	configuration data is up-to-date wrt the hardware. If that requires
	polling, this is when such polling would take place.  If the
	current configuration is all that's required, use
	RRGetScreenResourcesCurrent instead.

┌───
    RRGetOutputInfo
	output: OUTPUT
	config-timestamp: TIMESTAMP
	status: RRCONFIGSTATUS
	timestamp: TIMESTAMP
	crtc: CRTC

	name: STRING
	connection: CONNECTION
	subpixel-order: SUBPIXELORDER
	widthInMillimeters, heightInMillimeters: CARD32
	crtcs: LISTofCRTC
	clones: LISTofOUTPUT
	modes: LISTofMODE
	num-preferred: CARD16
└───
	Errors: Output

	RRGetOutputInfo returns information about the current and available
	configurations 'output'.

	If 'config-timestamp' does not match the current configuration
	timestamp (as returned by RRGetScreenResources), 'status' is set to
	InvalidConfigTime and the remaining reply data is empty. Otherwise,
	'status' is set to Success.

	'timestamp' indicates when the configuration was last set.

	'crtc' is the current source CRTC for video data, or Disabled if the
	output is not connected to any CRTC.

	'name' is a UTF-8 encoded string designed to be presented to the
	user to indicate which output this is. E.g. "S-Video" or "DVI".

	'connection' indicates whether the hardware was able to detect a
	device connected to this output. If the hardware cannot determine
	whether something is connected, it will set this to
	UnknownConnection.

	'subpixel-order' contains the resulting subpixel order of the
	connected device to allow correct subpixel rendering.

	'widthInMillimeters' and 'heightInMillimeters' report the physical
	size of the displayed area. If unknown, or not really fixed (e.g.,
	for a projector), these	values are both zero.

	'crtcs' is the list of CRTCs that this output may be connected to.
	Attempting to connect this output to a different CRTC results in a
	Match error.

	'clones' is the list of outputs which may be simultaneously
	connected to the same CRTC along with this output. Attempting to
	connect this output with an output not in the 'clones' list
	results in a Match error.

	'modes' is the list of modes supported by this output. Attempting to
	connect this output to a CRTC not using one of these modes results
	in a Match error.

	The first 'num-preferred' modes in 'modes' are preferred by the
	monitor in some way; for fixed-pixel devices, this would generally
	indicate which modes match the resolution of the output device.

	Changes in version 1.6 of the protocol:

	When a “non-desktop” device is connected, the 'connection'
	field will report Disconnected but the remaining fields will
	report information about the connected device.

┌───
    RRListOutputProperties
	output:OUTPUT
	atoms: LISTofATOM
└───
	Errors: Output

	This request returns the atoms of properties currently defined on
	the output.

	Changes in version 1.6 of the protocol:

	When a “non-desktop” device is connected, the property list
	will be correct for the device, even though RRGetOutputInfo
	reports the device as disconnected.

┌───
    RRQueryOutputProperty
	output: OUTPUT
	property: ATOM
	pending: BOOL
	range: BOOL
	immutable: BOOL
	valid-values: LISTofINT32
└───
	Errors: Name, Atom, Output

	If the specified property does not exist for the specified output,
	then a Name error is returned.

	If 'pending' is TRUE, changes made to property values with
	RRChangeOutputProperty will be saved in the pending property value
	and be automatically copied to the current value on the next
	RRSetCrtcConfig request involving the named output. If 'pending' is
	FALSE, changes are copied immediately.

	If 'range' is TRUE, then the valid-values list will contain
	precisely two values indicating the minimum and maximum allowed
	values. If 'range' is FALSE, then the valid-values list will contain
	the list of possible values; attempts to set other values will
	result in a Value error.

	If 'immutable' is TRUE, then the property configuration cannot be
	changed by clients. Immutable properties are interpreted by the X
	server.

	Changes in version 1.6 of the protocol:

	When a “non-desktop” device is connected, the property information
	will be correct for the device, even though RRGetOutputInfo
	reports the device as disconnected.

┌───
    RRConfigureOutputProperty
	output: OUTPUT
	property: ATOM
	pending: BOOL
	range: BOOL
	valid-values: LISTofINT32
└───
	Errors: Access, Name, Atom, Output

	If the specified property is 'immutable', an Access error is
	returned.

	Otherwise, the configuration of the specified property is changed to
	the values provided in this request.

	If the specified property does not exist for the specified output,
	it is created with an empty value and None type.

┌───
    RRChangeOutputProperty
	output: OUTPUT
	property, type: ATOM
	format: {8, 16, 32}
	mode: { Replace, Prepend, Append }
	data: LISTofINT8 or LISTofINT16 or LISTofINT32
└───
	Errors: Alloc, Atom, Match, Value, Output

	This request alters the value of the property for the specified
	output. If the property is marked as a 'pending' property, only the
	pending value of the property is changed. Otherwise, changes are
	reflected in both the pending and current values of the property.
	The type is uninterpreted by the server.  The format specifies
	whether the data should be viewed as a list of 8-bit, 16-bit, or
	32-bit quantities so that the server can correctly byte-swap as
	necessary.

	If the mode is Replace, the previous property value is discarded.
	If the mode is Prepend or Append, then the type and format must
	match the existing property value (or a Match error results).  If
	the property is undefined, it is treated as defined with the correct
	type and format with zero-length data.

	For Prepend, the data is tacked on to the beginning of the existing
	data, and for Append, it is tacked on to the end of the existing data.

	This request generates a OutputPropertyNotify

	The lifetime of a property is not tied to the storing client.
	Properties remain until explicitly deleted, until the output is
	destroyed, or until server reset (see section 10).

	The maximum size of a property is server-dependent and may vary
	dynamically.

┌───
    RRDeleteOutputProperty
	output: OUTPUT
	property: ATOM
└───
	Errors: Atom, Output

	This request deletes the property from the specified window if the
	property exists and generates a OutputPropertyNotify event unless
	the property does not exist.

┌───
    RRGetOutputProperty
	output: OUTPUT
	property: ATOM
	type: ATOM or AnyPropertyType
	long-offset, long-length: CARD32
	delete: BOOL
	pending: BOOL
	type: ATOM or None
	format: {0, 8, 16, 32}
	bytes-after: CARD32
	value: LISTofINT8 or LISTofINT16 or LISTofINT32
└───
	Errors: Atom, Value, Output

	If the specified property does not exist for the specified output,
	then the return type is None, the format and bytes-after are zero,
	and the value is empty.  The delete argument is ignored in this
	case.

	If the specified property exists but its type does not match the
	specified type, then the return type is the actual type of the
	property, the format is the actual format of the property (never
	zero), the bytes-after is the length of the property in bytes (even
	if the format is 16 or 32), and the value is empty.  The delete
	argument is ignored in this case.

	If the specified property exists and either AnyPropertyType is
	specified or the specified type matches the actual type of the
	property, then the return type is the actual type of the property,
	the format is the actual format of the property (never zero), and
	the bytes-after and value are as follows, given:

		N = actual length of the stored property in bytes
				  (even if the format is 16 or 32)
		I = 4 × offset
		T = N - I
		L = MINIMUM(T, 4 × long-length)
		A = N - (I + L)

	If 'pending' is true, and if the property holds a pending value,
	then the value returned will be the pending value of the property
	rather than the current value.  The returned value starts at byte
	index I in the property (indexing from 0), and its length in bytes
	is L.  However, it is a Value error if long-offset is given such
	that L is negative.  The value of bytes-after is A, giving the
	number of trailing unread bytes in the stored property.  If delete
	is True and the bytes-after is zero, the property is also deleted
	from the output, and a RROutputPropertyNotify event is generated.

	Changes in version 1.6 of the protocol:

	When a “non-desktop” device is connected, the property value
	will be correct for the device, even though RRGetOutputInfo
	reports the device as disconnected.

┌───
    RRCreateMode
	window: WINDOW
	modeinfo: MODEINFO
	mode: MODE
└───
	Errors: Window, Name, Value

	'modeinfo' provides a new mode for outputs on the screen
	associated with 'window'. If the name of 'modeinfo' names an
	existing mode, a Name error is returned.  If some parameter of the
	mode is not valid in some other way, a Value error is returned.

	The returned 'mode' provides the id for the mode.

┌───
    RRDestroyMode
	mode: MODE
└───
	Errors: Mode, Access

	The user-defined 'mode' is destroyed. 'mode' must name a mode
	defined with RRCreateMode, else an Match error is returned.  If
	'mode' is in use by some CRTC or Output, then an Access error is
	returned.

┌───
    RRAddOutputMode
	output: OUTPUT
	mode: MODE
└───
	Errors: Output, Mode, Match

	'output' indicates which output is to be configured.

	'mode' specifies which mode to add. If 'mode' is not valid for
	'output', then a Match error is generated.

	This request generates OutputChangeNotify events.

┌───
    RRDeleteOutputMode
	output: OUTPUT
	mode: MODE
└───
	Errors: Output, Mode

	'output' indicates which output is to be configured.

	'mode' specifies which mode to delete. 'mode' must have been added
	with RRAddOutputMode, else an Access error is returned. 'mode' must
	not be active, else a Match error is returned.

	This request generates OutputChangeNotify events.

┌───
    RRGetCrtcInfo
	crtc: CRTC
	config-timestamp: TIMESTAMP
	status: RRCONFIGSTATUS
	timestamp: TIMESTAMP
	x, y: INT16
	width, height: CARD16
	mode: MODE
	rotation: ROTATION
	outputs: LISTofOUTPUT

	rotations: SETofROTATION
	possible-outputs: LISTofOUTPUT
└───

	Errors: Window

	RRGetCrtcInfo returns information about the current and available
	configurations for the specified crtc connected to the screen
	associated with 'window'.

	If 'config-timestamp' does not match the current configuration
	timestamp (as returned by RRGetScreenResources), 'status' is set to
	InvalidConfigTime and the remaining reply data is empty. Otherwise,
	'status' is set to Success.

	'timestamp' indicates when the configuration was last set.

	'x' and 'y' indicate the position of this CRTC within the screen
	region. They will be set to 0 when the CRTC is disabled.

	'width' and 'height' indicate the size of the area within the screen
	presented by this CRTC. This may be different than the size of the
	mode due to rotation, the projective transform, and the Border property
	described below.  They will be set to 0 when the CRTC is disabled.

	'mode' indicates which mode is active, or None indicating that the
	CRTC has been disabled and is not displaying the screen contents.

	'rotation' indicates the active rotation. It is set to Rotate_0
	when the CRTC is disabled.

	'outputs' is the list of outputs currently connected to this CRTC
	and is empty when the CRTC is disabled.

	'rotations' contains the set of rotations and reflections supported
	by the CRTC.

	'possible-outputs' lists all of the outputs which may be connected
	to this CRTC.

┌───
    RRSetCrtcConfig
	crtc: CRTC
	timestamp: TIMESTAMP
	config-timestamp: TIMESTAMP
	x, y: INT16
	mode: MODE
	rotation: ROTATION
	outputs: LISTofOUTPUT
	status: RRCONFIGSTATUS
	new-timestamp: TIMESTAMP
└───
	Errors: Value, Match

	If 'timestamp' is less than the time when the configuration was last
	successfully set, the request is ignored and InvalidTime returned in
	status.

	If 'config-timestamp' is not equal to when the monitor's
	configuration last changed, the request is ignored and
	InvalidConfigTime returned in status. This could occur if the
	monitor changed since you last made a RRGetScreenInfo request,
	perhaps by a different monitor being connected to the machine.
	Rather than allowing an incorrect call to be executed based on stale
	data, the server will ignore the request.

	'x' and 'y' contain the desired location within the screen for this
	monitor's content. 'x' and 'y' must be within the screen size, else
	a Value error results.

	'mode' is either the desired mode or None indicating the CRTC should
	be disabled. If 'mode' is not one of these values, a Value
	error results. 'mode' must be valid for all of the configured outputs,
	else a Match error.

	'rotation' contains the desired rotation along with which
	reflections should be enabled. The rotation and reflection values
	must be among those allowed for this monitor, else a Value error
	results.

	'outputs' contains the set of outputs that this CRTC should be
	connected to. The set must be among the list of acceptable output
	sets for this CRTC or a Match error results.

	If 'mode' is None, then 'outputs' must be empty, else a Match error
	results. Conversely, if 'mode' is not None, then 'outputs' must not be
	empty, else a Match error results.

	This request may fail for other indeterminate reasons, in which case
	'status' will be set to Failed and no configuration change will be
	made.

	This request sets the CRTC to the specified position, mode, rotation
	and reflection. The entire area of the CRTC must fit within the
	screen size, else a Match error results. As an example, rotating the
	screen so that a single CRTC fills the entire screen before and
	after may necessitate disabling the CRTC, resizing the screen,
	then re-enabling the CRTC at the new configuration to avoid an
	invalid intermediate configuration.

	If panning is enabled, the width and height of the panning and the
	tracking areas are clamped to the new mode size.
	Disabled panning axes remain disabled.
	Panning borders are disabled if their requirements are no longer met
	(see RRSetPanning).

	When this request succeeds, 'status' contains Success and the
	requested changes to configuration will have been made.

	'new-time-stamp' contains the time at which this request was
	executed.

┌───
    RRGetCrtcGammaSize
	crtc: CRTC
	size: CARD16
└───
	Errors: Crtc

	This request returns the size of the gamma ramps used by 'crtc'.

┌───
    RRGetCrtcGamma
	crtc: CRTC
	red: LISTofCARD16
	green: LISTofCARD16
	blue: LISTofCARD16
└───
	Errors: Crtc

	This request returns the currently set gamma ramps for 'crtc'.  All
	three lists will be the size returned by the RRGetCrtcGammaSize
	request.

┌───
    RRSetCrtcGamma
	crtc: CRTC
	red: LISTofCARD16
	green: LISTofCARD16
	blue: LISTofCARD16
└───
	Errors: Crtc, Match

	This request sets the gamma ramps for 'crtc'. All three lists
	must be the size returned by RRGetCrtcGammaSize else a Value error
	results.

7.2. Extension Requests added in version 1.3 of the extension

┌───
    RRGetScreenResourcesCurrent
	window: WINDOW
	timestamp: TIMESTAMP
	config-timestamp: TIMESTAMP
	crtcs: LISTofCRTC
	outputs: LISTofOUTPUT
	modes: LISTofMODEINFO
└───
	Errors: Window

	RRGetScreenResourcesCurrent returns the list of outputs and crtcs
	connected to the screen associated with 'window'.

	'timestamp' indicates when the configuration was last set.

	'config-timestamp' indicates when the configuration information last
	changed. Requests to configure the output will fail unless the
	timestamp indicates that the information the client is using is up
	to date, to ensure clients can be well behaved in the face of race
	conditions.

	'crtcs' contains the list of CRTCs associated with the screen.

	'outputs' contains the list of outputs associated with the screen.

	'modes' contains the list of modes associated with the screen.

	Unlike RRGetScreenResources, this merely returns the current
	configuration, and does not poll for hardware changes.

┌───
    RRSetCrtcTransform
	crtc: CRTC
	transform: TRANSFORM
	filter: STRING8
	values: LISTofFIXED
└───
	Errors: Crtc, Match

	This request provides a mechanism that is more general than the
	existing rotation and reflection values for describing the
	transformation from frame buffer image to crtc presentation.
	'transform' is a full 2D projective transformation from screen
	coordinate space to crtc coordinate space. This transformation is
	applied before the rotation and reflection values to compute the
	complete transform.

	'filter' and 'values' specify a Render filter that may be used by the
	server when transforming data from frame buffer to crtc.

	This request sets the transform to be used at the next
	RRSetCrtcConfig request execution; it does not cause any change to
	occur in the current configuration.

	When a non-identity transformation is in use, the rectangle returned
	by RRGetCrtcInfo defines the bounding rectangle of the screen that is
	projected to the crtc. It is this projected rectangle which must be
	within the area of the screen when the mode is set.

┌───
    RRGetCrtcTransform
	crtc: CRTC
	pending-transform: TRANSFORM
	pending-filter: STRING8
	pending-values: LISTofFIXED
	current-transform: TRANSFORM
	current-filter: STRING8
	current-values: LISTofFIXED
└───

	This request returns the pending and current transforms for the
	specified CRTC. The pending transform will be the same as the current
	transform if no new pending transform has been set since the last call
	to RRSetCrtcConfig.

┌───
    RRGetPanning
	crtc: CRTC
	status: RRCONFIGSTATUS
	timestamp: TIMESTAMP
	left, top, width, height: CARD16
	track_left, track_top, track_width, track_height: CARD16
	border_left, border_top, border_right, border_bottom: INT16
└───

	Errors: Crtc

	Version 1.3 adds panning support again. If multiple crtcs are active
	the panning behavior can be defined per crtc individually.
	RRGetPanning returns information about the currently set panning
	configuration for the specified crtc.  If the CRTC does not support
	panning, all fields (except timestamp) will be 0.

	'timestamp' indicates when the configuration was last set.

	All other entries are explained for RRSetPanning.

┌───
    RRSetPanning
	crtc: CRTC
	timestamp: TIMESTAMP
	left, top, width, height: CARD16
	track_left, track_top, track_width, track_height: CARD16
	border_left, border_top, border_right, border_bottom: INT16
	status: RRCONFIGSTATUS
	new-timestamp: TIMESTAMP
└───
	Errors: Crtc, Match

	This request sets the panning parameters.  As soon as panning is
	enabled, the CRTC position can change with every pointer move.
	RRCrtcChangeNotify events are sent to the clients requesting those.

	If 'timestamp' is less than the time when the configuration was last
	successfully set, the request is ignored and InvalidTime returned in
	status.

	┌──┳━━━━━━━━━━━━━━┳─────┬ ─ ─ ─ ─ ─ ┐
	│  ┃     CRTC     ┃     │
	│  ┃              ┃     │           │
	│  ┃             X┃→    │
	│  ┃              ┃     │           │  framebuffer
	│  ┗━━━━━━━━━━━━━━┛     │
	│                       │           │
	│panning area           │
	└───────────────────────┴ ─ ─ ─ ─ ─ ┘

	'left', 'top', 'width', and 'height' contain the total panning area
	for this CRTC.  'width' has to be larger than or equal to the CRTC's
	width or 0, and 'left'+'width' must be within the screen size, else a
	Match error results.  Equivalent restrictions for the height exist.
	'width' or 'height' set to 0 indicate that panning should be disabled
	on the according axis.  Setting 'width'/'height' to the CRTC's
	width/height will disable panning on the X/Y axis as well, but
	RRSetScreenSize will silently enable panning if the screen size is
	increased. This does not happen if set to 0.

	┌────────┳━━━━━━━━━━━━━━┳ ─ ─ ─ ─ ─ ┐
	│        ┃     CRTC     ┃
	│        ┃              ┃           │
	│        ┃              ┃
	│        ┃              ┃           │  tracking area
	│        ┗━━━━━━━━━━━━━━┫     X
	│               ↓       │     ↓     │
	│panning area           │
	└───────────────────────┴ ─ ─ ─ ─ ─ ┘

	'track_left', 'track_top', 'track_width', and 'track_height' contain
	the pointer area for which the panning region is updated.  For normal
	use cases it should enclose the panning area minus borders, and is
	typically set to either the panning area minus borders, or to the
	total screen size. If set to the total screen size, the CRTC will pan
	in the remaining axis even if the pointer is outside the panning area
	on a different CRTC, as shown in the figure above. If the pointer is
	outside the tracking area, the CRTC will not pan. Zero can be used as
	an alias for the total screen size.

	┌──┳━━━━━━━━━━━━━━┳────────────┐
	│  ┃     CRTC     ┃            │
	│  ┃              ┃            │
	│  ┃              ┃→           │
	│  ┃           X←→┃            │
	│  ┃       border_right        │
	│  ┗━━━━━━━━━━━━━━┛            │
	│                              │
	│panning area                  │
	└──────────────────────────────┘

	'border_left', 'border_top', 'border_right', and 'border_bottom'
	define the distances from the CRTC borders that will activate panning
	if the pointer hits them.  If the borders are 0, the screen will pan
	when the pointer hits the CRTC borders (behavior of pre-RandR Xserver
	panning).  If the borders are positive, the screen will pan when the
	pointer gets close to the CRTC borders, if they are negative, the
	screen will only pan when the pointer is already way past the CRTC
	borders.  Negative values might confuse users and disable panning to
	the very edges of the screen.  Thus they are discouraged.
	border_left + border_right has to be lower or equal than the CRTC's
	width, else a Match error results.  An equivalent restriction for the
	height exists.

	Screen size changes update the panning and the tracking areas to the
	new size. Both screen size changes and mode changes clamp these areas
	to the current CRTC size.  In these cases panning borders are disabled
	if their requirements are no longer met.

	When this request succeeds, 'status' contains Success and the
	requested changes to configuration will have been made.

	'new-time-stamp' contains the time at which this request was
	executed.

┌───
    RRSetOutputPrimary
	window: WINDOW
	output: OUTPUT
└───
	Errors: Match, Output, Window

	RRSetOutputPrimary marks 'output' as the primary output for the
	screen with the same root window as 'window'. This output's CRTC
	will be sorted to the front of the list in Xinerama and RANDR
	geometry requests for the benefit of older applications. The
	default primary output is None, and None is a legal value to pass
	to RRSetOutputPrimary. This request is expected to be used by
	desktop environments to mark the screen that should hold the primary
	menu bar or panel.

	As this changes the logical layout of the screen, ConfigureNotify
	and RRScreenChangeNotify will be generated on the appropriate root
	window when the primary output is changed by this call. This request
	also generates RROutputChangeNotify events on the outputs that gained
	and lost primary status.

	If an output is disconnected asynchronously (eg. due to recabling),
	the primary status does not change, but RROutputChangeNotify events
	will be generated if the hardware is capable of detecting this;
	clients are expected to reconfigure if appropriate.

	If an output is deleted (eg. due to device hotplug), the server will
	act as though None was passed to RRSetOutputPrimary, including
	generating the appropriate events.

┌───
    RRGetOutputPrimary
	window: WINDOW
	output: OUTPUT
└───
	Errors: Window

	RRGetOutputPrimary returns the primary output for the screen.

			      ❧❧❧❧❧❧❧❧❧❧❧

7.4 Extension Requests added in version 1.4 of the extension.

┌───
    RRGetProviders
	window : WINDOW
	timestamp: TIMESTAMP
	providers: LISTofPROVIDER
└───
	Errors: Window

	RRGetProviders returns the list of providers connected to the screen
	associated with 'window'.

	'timestamp' indicates when the configuration was last set.

	'providers' contains the list of PROVIDERs associated with the
	screen.

┌───
    RRGetProviderInfo
	provider: PROVIDER
	capabilities: PROVIDER_CAPS
	name: STRING
	crtcs: LISTofCRTC
	outputs: LISTofOUTPUT
	associated_providers: LISTofPROVIDERS
	associated_provider_capability: LISTofPROVIDER_CAPS
└───
	Errors: Provider

	RRGetProviderInfo return information about the specified provider.
	The capabilities of the current provider are returned, along with
	the list of providers currently associated with this provider and
	the capability they are associated with. It also provides the list
	of crtcs and outputs that this provider is responsible for.

	'name' is a UTF-8 encoded string to be presented to the user to
	indicate the device or driver supplied name.

┌───
    RRSetProviderOffloadSink
	provider: PROVIDER
	sink_provider: PROVIDER
	config-timestamp: TIMESTAMP
└───
	Errors: Provider

	RRSetOffloadSink sets the offload sink for this provider to the
	specified provider.

┌───
    RRSetProviderOutputSource
	provider: PROVIDER
	source_provider: PROVIDER
	config-timestamp: TIMESTAMP
└───
	Errors: Provider

	RRSetOutputSource sets the output source for this provider to the
	specified provider.

┌───
    RRListProviderProperties
	provider:PROVIDERS
	atoms: LISTofATOM
└───
	Errors: Provider

	This request returns the atoms of properties currently defined on
	the provider.

┌───
    RRQueryProviderProperty
	provider: PROVIDER
	property: ATOM
	pending: BOOL
	range: BOOL
	immutable: BOOL
	valid-values: LISTofINT32
└───
	Errors: Name, Atom, Provider

	If the specified property does not exist for the specified provider,
	then a Name error is returned.

	If 'pending' is TRUE, changes made to property values with
	RRChangeProviderProperty will be saved in the pending property value
	and be automatically copied to the current value on the next
	RRSetCrtcConfig request on a crtc attached to that provider.
	If 'pending' is	FALSE, changes are copied immediately.

	If 'range' is TRUE, then the valid-values list will contain
	precisely two values indicating the minimum and maximum allowed
	values. If 'range' is FALSE, then the valid-values list will contain
	the list of possible values; attempts to set other values will
	result in a Value error.

	If 'immutable' is TRUE, then the property configuration cannot be
	changed by clients. Immutable properties are interpreted by the X
	server.

┌───
    RRConfigureProviderProperty
	provider: PROVIDER
	property: ATOM
	pending: BOOL
	range: BOOL
	valid-values: LISTofINT32
└───
	Errors: Access, Name, Atom, Provider

	If the specified property is 'immutable', an Access error is
	returned.

	Otherwise, the configuration of the specified property is changed to
	the values provided in this request.

	If the specified property does not exist for the specified provider,
	it is created with an empty value and None type.

┌───
    RRChangeProviderProperty
	provider: PROVIDER
	property, type: ATOM
	format: {8, 16, 32}
	mode: { Replace, Prepend, Append }
	data: LISTofINT8 or LISTofINT16 or LISTofINT32
└───
	Errors: Alloc, Atom, Match, Value, Provider

	This request alters the value of the property for the specified
	provider. If the property is marked as a 'pending' property, only the
	pending value of the property is changed. Otherwise, changes are
	reflected in both the pending and current values of the property.
	The type is uninterpreted by the server.  The format specifies
	whether the data should be viewed as a list of 8-bit, 16-bit, or
	32-bit quantities so that the server can correctly byte-swap as
	necessary.

	If the mode is Replace, the previous property value is discarded.
	If the mode is Prepend or Append, then the type and format must
	match the existing property value (or a Match error results).  If
	the property is undefined, it is treated as defined with the correct
	type and format with zero-length data.

	For Prepend, the data is tacked on to the beginning of the existing
	data, and for Append, it is tacked on to the end of the existing data.

	This request generates a ProviderPropertyNotify

	The lifetime of a property is not tied to the storing client.
	Properties remain until explicitly deleted, until the provider is
	destroyed, or until server reset (see section 10).

	The maximum size of a property is server-dependent and may vary
	dynamically.
┌───
    RRDeleteProviderProperty
	provider: Provider
	property: ATOM
└───
	Errors: Atom, Provider

	This request deletes the property from the specified provider if the
	property exists and generates a ProviderPropertyNotify event unless
	the property does not exist.

┌───
    RRGetProviderProperty
	provider: PROVIDER
	property: ATOM
	type: ATOM or AnyPropertyType
	long-offset, long-length: CARD32
	delete: BOOL
	pending: BOOL
	type: ATOM or None
	format: {0, 8, 16, 32}
	bytes-after: CARD32
	value: LISTofINT8 or LISTofINT16 or LISTofINT32
└───
	Errors: Atom, Value, Provider

	If the specified property does not exist for the specified provider,
	then the return type is None, the format and bytes-after are zero,
	and the value is empty.  The delete argument is ignored in this
	case.

	If the specified property exists but its type does not match the
	specified type, then the return type is the actual type of the
	property, the format is the actual format of the property (never
	zero), the bytes-after is the length of the property in bytes (even
	if the format is 16 or 32), and the value is empty.  The delete
	argument is ignored in this case.

	If the specified property exists and either AnyPropertyType is
	specified or the specified type matches the actual type of the
	property, then the return type is the actual type of the property,
	the format is the actual format of the property (never zero), and
	the bytes-after and value are as follows, given:

		N = actual length of the stored property in bytes
				  (even if the format is 16 or 32)
		I = 4 × offset
		T = N - I
		L = MINIMUM(T, 4 × long-length)
		A = N - (I + L)

	If 'pending' is true, and if the property holds a pending value,
	then the value returned will be the pending value of the property
	rather than the current value.  The returned value starts at byte
	index I in the property (indexing from 0), and its length in bytes
	is L.  However, it is a Value error if long-offset is given such
	that L is negative.  The value of bytes-after is A, giving the
	number of trailing unread bytes in the stored property.  If delete
	is True and the bytes-after is zero, the property is also deleted
	from the provider, and a RRProviderPropertyNotify event is generated.


			      ❧❧❧❧❧❧❧❧❧❧❧

7.5. Extension Requests added in version 1.5 of the extension.

┌───
    RRGetMonitors
	window : WINDOW
	get_active : BOOL
	timestamp: TIMESTAMP
	monitors: LISTofMONITORINFO
└───
	Errors: Window

	Returns the list of Monitors for the screen containing
	'window'. If 'get_active' is set it returns only active
	monitors (non-0x0 monitors).  'get_active' should always
	be set by toolkits, and not by configuration clients.

	'timestamp' indicates the server time when the list of
	monitors last changed.

┌───
    RRSetMonitor
	window : WINDOW
	info: MONITORINFO
└───
	Errors: Window, Output, Atom, Value

	Create a new monitor. Any existing Monitor of the same name is deleted.

	'name' must be a valid atom or an Atom error results.

	'name' must not match the name of any Output on the screen, or
	a Value error results.

	If 'info.outputs' is non-empty, and if x, y, width, height are all
	zero, then the Monitor geometry will be dynamically defined to
	be the bounding box of the geometry of the active CRTCs
	associated with them.

	If 'name' matches an existing Monitor on the screen, the
	existing one will be deleted as if RRDeleteMonitor were called.

	For each output in 'info.outputs, each one is removed from all
	pre-existing Monitors. If removing the output causes the list of
	outputs for that Monitor to become empty, then that Monitor will
	be deleted as if RRDeleteMonitor were called.

	Only one monitor per screen may be primary. If 'info.primary'
	is true, then the primary value will be set to false on all
	other monitors on the screen.

	RRSetMonitor generates a ConfigureNotify event on the root
	window of the screen.

┌───
    RRDeleteMonitor
	window : WINDOW
	name: ATOM
└───
	Errors: Window, Atom, Value

	Deletes the named Monitor.

	'name' must be a valid atom or an Atom error results.

	'name' must match the name of a Monitor on the screen, or a
	Value error results.

	RRDeleteMonitor generates a ConfigureNotify event on the root
	window of the screen.

			      ❧❧❧❧❧❧❧❧❧❧❧

7.6. Extension Requests added in version 1.6 of the extension.

┌───
    RRCreateLease
	window : WINDOW
	lid: LEASE
	crtcs: LISTofCRTC
	outputs: LISTofOUTPUT
	nfd: CARD8
	lease: FD
└───
	Errors: IdChoice, Window, Access, Value, CRTC, Output

	Creates a new Lease called 'lid' for the specified crtcs and
	outputs from the screen defined by 'window'. Returns a KMS/DRM
	file descriptor which can control the leased objects directly
	through the kernel. While leased, all resources will appear to
	be 'useless' to clients other than the leasing client as
	follows:

	• Crtcs are reported as having no 'possible-outputs' and all
	  other values reported as if the crtc were disabled.

	• Outputs are reported as having no crtcs they can be
	  connected to, no clones they can share a crtc with, will
	  report a connection status of Disconnected, and will show
	  the current crtc as if it were disabled.

	The lease remains in effect until the file descriptor is
	closed, even if the client holding the lease disconnects from
	the X server.

	Returns an Access error if any of the named resources are
	already leased to another client.

┌───
    RRFreeLease
	lid: LEASE
	terminate: BOOL
└───
	Errors: Lease

	Frees the reference to the lease 'lid'. If 'terminate' is
	true, then the lease is terminated and all leased resources
	returned to the X server. If 'terminate' is false, then the
	lease remains in effect, but the X server no longer has a name
	for it.

			      ❧❧❧❧❧❧❧❧❧❧❧
8. Extension Events

Clients MAY select for ConfigureNotify on the root window to be
informed of screen changes. This may be advantageous if all your
client needs to know is the size of the root window, as it avoids
round trips to set up the extension.

RRScreenChangeNotify is sent if RRSelectInput has requested it
whenever properties of the screen change, which may be due to external
factors, such as re-cabling a monitor, etc.

┌───
    RRScreenChangeNotify

	rotation: ROTATION;		new rotation
	sequenceNumber: CARD16		low 16 bits of request seq. number
	timestamp: TIMESTAMP		time screen was changed
	configTimestamp: TIMESTAMP	time config data was changed
	root: WINDOW			root window of screen
	window: WINDOW			window requesting notification
	size-id: SIZEID			index of new SCREENSIZE
	subpixelOrder: SUBPIXELORDER	order of subpixels
	widthInPixels: CARD16		width in pixels of the new SCREENSIZE
	heightInPixels: CARD16		height in pixels of the new SCREENSIZE
	widthInMillimeters: CARD16	width in mm of the new SCREENSIZE
	heightInMillimeters: CARD16	height in mm of the new SCREENSIZE
└───
	This event is generated whenever the screen configuration is changed
	and sent to requesting clients. 'timestamp' indicates when the
	screen configuration was changed. 'configTimestamp' says when the
	last time the configuration was changed. 'root' is the root of the
	screen the change occurred on, 'window' is window selecting for this
	event. 'size-id' contains the index of the current size.

	This event is sent whenever the screen's configuration changes
	or if a new screen configuration becomes available that was
	not available in the past. In this case (config-timestamp in
	the event not being equal to the config-timestamp returned in
	the last call to RRGetScreenInfo), the client MUST call
	RRGetScreenInfo to update its view of possible screen
	configurations to have a correct view of possible screen
	organizations.

	Clients which select screen change notification events may be
	sent an event immediately if the screen configuration was
	changed between when they connected to the X server and
	selected for notification. This is to prevent a common race
	that might occur on log-in, where many applications start up
	just at the time when a display manager or log in script might
	be changing the screen size or configuration.

	Note that the sizes in this event reflect the new SCREENSIZE and
	thus will appear rotated by the 'rotation' parameter from the sizes
	of the screen itself. In other words, when rotation is 90 or 270,
	widthInPixels in this event will be the same as the height value
	from a ConfigureNotify that reflects the same size change. This
	will probably confuse developers.

8.1 Events added in version 1.2 of the RandR extension

┌───
    RROutputChangeNotify:
	timestamp: TIMESTAMP		time screen was reconfigured
	config-timestamp: TIMESTAMP	time available config data was changed
	window: WINDOW			window requesting notification
	output: OUTPUT			output affected by change
	crtc: CRTC			connected CRTC or None
	mode: MODE			mode in use on CRTC or None
	connection: CONNECTION		connection status
└───

	This event is generated whenever the available output configurations
	have changed and is sent to requesting clients. 'timestamp'
	indicates when the crtc configuration was changed by a client.
	'config-timestamp' says when the last time the available
	configurations changed. 'root' is the root of the screen the change
	occurred on, 'window' is window selecting for this event. The
	precise change can be detected by examining the new state of the
	system.

	Changes in version 1.6 of the protocol:

	When a “non-desktop” device is connected, this event will be
	delivered when the connection status of the output changes,
	however the 'connection' value will be set to 'Disconnected'.

┌───
    RROutputPropertyNotify:
	window: WINDOW			window requesting notification
	output: OUTPUT			output affected by change
	atom: ATOM			affected property
	time: TIMESTAMP			time property was changed
	subpixel-order: SUBPIXELORDER	order of subpixels
	state: { NewValue, Deleted }	new property state
└───

	This event is reported to clients selecting RROutputPropertyChange
	on the window and is generated with state NewValue when a property
	of the window is changed using RRChangeOutputProperty even when
	adding zero-length data and when replacing all or part of a property
	with identical data.  It is generated with state Deleted when a
	property of the window is deleted using either
	RRDeleteOutputProperty or RRGetOutputProperty.  The timestamp
	indicates the server time when the property was changed.

┌───
    RRCrtcChangeNotify
	timestamp: TIMESTAMP		time monitor was changed
	window: WINDOW			window requesting notification
	crtc: CRTC			CRTC which changed
	mode: MODE			new mode
	rotation: ROTATION;		new rotation
	x: INT16			x position of CRTC within screen
	y: INT16			y position of CRTC within screen
	width: CARD16			width of new configuration
	height: CARD16			height of new configuration
└───
	This event is generated whenever the CRTC configuration is changed
	and sent to requesting clients. 'timestamp' indicates when the
	CRTC configuration was changed. 'window' is window selecting for this
	event. 'mode' is the new mode, or None if the crtc is disabled.
	'x' and 'y' mark the location in the screen where this CRTC
	is reading data. 'width' and 'height' indicate the size of the
	CRTC viewport, which is the mode size adjusted by the optional
	Border output property described below. 'x', 'y, 'width' and
	'height' are all zero when 'mode' is None.

	This event is sent whenever the monitor's configuration changes
	or if a new monitor configuration becomes available that was
	not available in the past. In this case, the client MUST call
	RRGetCrtcInfo to update its view of possible monitor
	configurations to have a correct view of possible monitor
	organizations.

	Clients which select monitor change notification events may be
	sent an event immediately if the monitor configuration was
	changed between when they connected to the X server and
	selected for notification. This is to prevent a common race
	that might occur on log-in, where many applications start up
	just at the time when a display manager or log in script might
	be changing the monitor size or configuration.

8.2 Events added in version 1.4 of the RandR extension

┌───
    RRProviderChangeNotify:
	timestamp: TIMESTAMP		time screen was reconfigured
	window: WINDOW			window requesting notification
	provider: PROVIDER		provider affected by change
└───

	This event is generated whenever the role for a provider has changed
	and is sent to requesting clients. 'timestamp' indicates when the
	provider configuration was changed by a client.  'window' is the
	window selecting for this event.  The precise change can be detected
	by examining the new state of the system.

┌───
    RRProviderPropertyNotify:
	window: WINDOW			window requesting notification
	provider: PROVIDER		provider affected by change
	atom: ATOM			affected property
	time: TIMESTAMP			time property was changed
	state: { NewValue, Deleted }	new property state
└───

	This event is reported to clients selecting RRProviderPropertyChange
	on the window and is generated with state NewValue when a property
	of the window is changed using RRChangeProviderProperty even when
	adding zero-length data and when replacing all or part of a property
	with identical data.  It is generated with state Deleted when a
	property of the window is deleted using either
	RRDeleteProviderProperty or RRGetProviderProperty.  The timestamp
	indicates the server time when the property was changed.

┌───
    RRResourceChangeNotify:
	window: WINDOW			window requesting notification
	time: TIMESTAMP			time property was changed
└───

	This event is reported to clients selecting RRResourceChange
	on the window and is generated whenever the set of available
	RandR resources associated with the screen has changed, either
	created or destroyed. Querying the list of available resources
	with RRGetScreenResources and RRGetProviders will return the new set.

8.3 Events added in version 1.6 of the RandR extension

┌───
    RRLeaseNotify:
	timestamp : TIMESTAMP		time screen was reconfigured
	window : WINDOW			window requesting notification
	lease : LEASE			lease
	created : BOOL			created/destroyed indicator
└───

	This event is generated whenever a lease has been created or
	destroyed and is sent to requesting clients. 'timestamp'
	indicates when the change happend.  'window' is the window
	selecting for this event.

			      ❧❧❧❧❧❧❧❧❧❧❧

9. Properties

Properties are used for output specific parameters, and for announcing
static or rarely changing data.  Announced data is typically
immutable.  Properties are also used for evaluating new parameters
before adding them to the RandR protocol.

The following properties are hereby declared official, and drivers SHOULD
prefix driver specific properties with '_', unless they are planned to be
added to this specification.  List values, that are not declared by the table
below, and will remain driver specific or are not planned to be added to this
specification, SHOULD be prefixed with "_" as well in order to avoid name
space or semantics clashes with future extensions of these values.

Beginning with version 1.3 of the RandR extension, certain properties
are mandatory and MUST be provided by implementations.  Earlier
versions of the RandR extension MAY provide these properties as well,
as long as the semantics are not altered.  Clients SHOULD fall back
gracefully to lower version functionality, though, if the driver
doesn't handle a mandatory property correctly.

Changes in version 1.6 of the protocol:

When a “non-desktop” device is connected, the property information
will be correct for the device, even though RRGetOutputInfo
reports the device as disconnected. The “non-desktop” property will be
set to 1 for such devices and not present on other devices.

9.1 Known properties

    "Backlight"			aka RR_PROPERTY_BACKLIGHT
	Type:			INTEGER
	Format:			32
	Num. items:		1
	Flags:			-
	Range/List:		0-x (driver specific)

	This property controls the brightness on laptop panels and equivalent
	displays with a backlight controller. The driver specific maximum
	value MUST turn the backlight to full brightness, 1 SHOULD turn the
	backlight to minimum brightness, 0 SHOULD turn the backlight off.

    "CloneList"			aka RR_PROPERTY_CLONE_LIST
	Type:			ATOM
	Format:			32
	Num. items:		2*n
	Flags:			Immutable
	Range/List:		0-

	Some combinations of outputs on some cards cannot be served
	independently from each other, because they are wired up to the same
	encoder outputs.
	This property lists all output + signal format pairs that are
	driven together with this output, and thus can only be programmed in
	clone mode with the same CRTC.
	This property MUST be symmetric, but may change with changing signal
	format. I.e. if the property for DVI-1/VGA specifies VGA-1/VGA to be
	cloned, VGA-1/VGA has to list DVI-1/VGA as well.
	Outputs / format pairs listed in this property MUST be included in the
	CompatibilityList.

    "CompatibilityList"		aka RR_PROPERTY_COMPATIBILITY_LIST
	Type:			ATOM
	Format:			32
	Num items:		2*n
	Flags:			Immutable
	Range/List:		0-

	Some combinations of outputs on some cards cannot be served at all,
	because the according encoder is only capable of driving one output at
	a time.
	This property lists all output + signal format pairs that can be
	driven together with this output. NULL atoms specify any output / any
	signal format, respectively.
	This property MUST be symmetric, but may change with changing signal
	format. I.e. if the property for DVI-1/TMDS specifies VGA-1/VGA to be
	available, VGA-1/VGA has to list DVI-1/TMDS as well.

    "ConnectorNumber"		aka RR_PROPERTY_CONNECTOR_NUMBER
	Type:			INTEGER
	Format:			32
	Num items:		1
	Flags:			Immutable, Static
	Range/List:		0-

	Outputs that route their signal to the same connector MUST
	have the same connector number. Outputs with the same
	connector number MUST route their signal to the same
	connector, except if it is 0, which indicates unknown
	connectivity. 1 is called the primary connector, 2 the
	secondary. 3 is typically a TV connector, but that is completely
	driver / hardware dependent.
	Outputs with the same connector number SHOULD have the same
	connector type. Meaning and client behavior for mismatching
	connector types is undefined at the moment.

    "ConnectorType"		aka RR_PROPERTY_CONNECTOR_TYPE
	Type:			ATOM
	Format:			32
	Num items:		1
	Flags:			Immutable, Static
	Range/List:		unknown VGA DVI DVI‐I DVI‐A DVI‐D HDMI Panel
				TV TV-Composite TV-SVideo TV-Component
				TV-SCART TV-C4 DisplayPort

	Connector type, as far as known to the driver.
	Values with dashes (TV‐Composite) describe more specific versions of
	the base values (TV). The former SHOULD be used if the connector is
	not capable of producing other signal formats. The later SHOULD be
	used if the exact connector is unknown, or the connector is a
	multi‐format connector that is not described otherwise. DVI, for
	instance, SHOULD be handled like a DVI‐I connector, unless additional
	information is available to the user agent. PANEL describes
	laptop‐internal (normally LVDS) displays. TV, TV‐SCART, TV‐Component,
	and TV‐C4 with signal format VGA are valid combinations and describe
	RGB TV signals.

    "EDID"			aka RR_PROPERTY_RANDR_EDID
	Type:			INTEGER
	Format:			8
	Num items:		n
	Flags:			Immutable
	Range/List:		-

	Raw EDID data from the device attached to the according
	output. Should include main EDID data and all extension
	blocks. Previously known as EdidData.

    “non-desktop”	aka RR_PROPERTY_NON_DESKTOP
	Type:			INTEGER
	Format:			32
	Num items:		1
	Flags			Immutable
	Range/List:		0-1

	Indicates whether the device attached to this output should not
	be considered part of the normal desktop. When set to 0 or not
	present, the output should be presented as part of the
	desktop.

	When set to 1, the output should not be presented as part of
	the desktop. To not present an output as part of the desktop,
	the normal desktop environment should not be shown on this
	output, nor should desktop applications be positioned on it.

	When set to 1, RRGetOutputInfo will always report connection status
	Disconnected, but RROutputChangeNotify events will still be
	delivered when the connection status changes and all other
	information about the output and connected device will be
	reported correctly.

    "SignalFormat"		aka RR_PROPERTY_SIGNAL_FORMAT
	Type:			ATOM
	Format:			32
	Num items:		1
	Flags:			-
	Range/List:		unknown VGA TMDS LVDS Composite Composite-PAL
				Composite-NTSC Composite-SECAM SVideo
				Component DisplayPort

	Signal format / physical protocol format that is used for the
	specified output. valid-values lists all possible formats on this
	output, which SHOULD be a subset of the list above and MUST be static.
	Values with dashes (Composite-PAL) describe more specific versions of
	the base values (Composite) and SHOULD be used if known to the driver.
	A driver MAY change this property of an output if the underlying
	hardware indicates a protocol change (e.g. TV formats).  Clients are
	allowed to change the signal format in order to select a different
	signal format (e.g. Composite etc.) or physical protocol (e.g. VGA or
	TMDS on DVI-I).
	Laptop panels SHOULD not be detected with this property, but rather by
	ConnectorType.

    "SignalProperties"		aka RR_PROPERTY_SIGNAL_FORMAT
	Type:			ATOM
	Format:			32
	Num items:		n
	Flags:			-
	Range/List:		For Composite signals:
				  NTSC NTSC-M NTSC-J NTSC-N NTSC-4.43 NTSC-film
				  PAL PAL-B PAL-G PAL-H PAL-H PAL-I PAL-M PAL-D
				  PAL-N PAL-Nc PAL-L PAL-60
				  SECAM SECAM-L SECAM-B SECAM-G SECAM-D SECAM-K
				  SECAM-H SECAM-K
				For TMDS signals:
				  SingleLink DualLink
				For DisplayPort signals:
				  Lane1 Lane2 Lane4 LowSpeed HiSpeed

	Properties of the signal format that is currently used for the
	specified output. valid-values lists all possible properties on this
	output, which SHOULD be a subset of the list above. It will change if
	SignalFormat changes.  Multiple properties are allowed.
	Values with dashes (PAL-B) describe more specific versions of the base
	values (PAL) and SHOULD be used if known to the driver.  A driver MAY
	change this property of an output if the underlying hardware indicates
	a signal change (e.g. TV formats).  Clients are allowed to change the
	properties in order to select a different signal subformat.

    "Border"			aka RR_PROPERTY_BORDER
	Type:			CARDINAL
	Format:			16
	Num items:		0, 1, 2, or 4
	Flags:			Immutable
	Range/List:		0-

	This property is a list of integers specifying adjustments for the edges
	of the displayed image. How this property is applied depends on the
	number of elements in the list:

	  0 = No border is applied
	  1 = A border of Border[0] is applied to all four sides of the image.
	  2 = A border of Border[0] is applied to the left and right sides of
	      the image, and a border of Border[1] is applied to the top and
	      bottom.
	  4 = The border dimensions are as follows:
		Border[0]: left
		Border[1]: top
		Border[2]: right
		Border[3]: bottom

	Note that how many configuration dimensions are actually supported is
	specified by the BorderDimensions property described below. If more than
	BorderDimensions values are specified, the extra values are ignored.

	These border dimensions shrink the region of pixels displayed by the
	CRTC by the corresponding number of rows or columns, and is applied
	after the CRTC transform. For example, a mode with a 1920x1080 active
	region, border dimensions of [ 10, 20, 30, 40 ], and a ½x scaling
	transform would display a rectangle of 940x510 pixels from the scanout
	pixmap scaled to 1880x1020 raster pixels positioned at (10, 20) in
	display raster space.

	Raster pixels in the border are black.

	This property is created with pending == TRUE, so changes are not
	applied immediately and instead take effect at the next RRSetCrtcConfig.

	If multiple outputs with different border settings are bound to the same
	CRTC when the configuration is changed, the behavior is undefined.

	If the length of the property is less than four when the CRTC is
	configured, the missing values are assumed to be zero.  If the length is
	greater than four, the extra values are ignored.

	If the width of the mode is less than or equal to the sum of the left
	and right borders, then the left and right border settings are ignored.
	Likewise, if the height of the mode is less than or equal to the sum of
	the top and bottom borders, the top and bottom borders are ignored.

    "BorderDimensions"		aka RR_PROPERTY_BORDER_DIMENSIONS
	Type:			CARDINAL
	Format:			8
	Num items:		1
	Flags:			Immutable, Static
	Range/List:		0, 1, 2, or 4

	This property lists how many border adjustment parameters can actually
	be used:

	  0 = no borders are supported
	  1 = a single border value is applied to all four sides of the image
	  2 = left/right and top/bottom borders can be specified independently
	  4 = all four borders can be specified independently

    "GUID"			aka RR_PROPERTY_GUID
	Type:			INTEGER
	Format:			8
	Num items:		16
	Flags:			Immutable
	Range/List:		-

	Some display devices, such as DisplayPort 1.2 devices, have globally
	unique identifiers.  When such an identifier is available, this property
	contains its raw bytes.

    "TILE"			aka RR_PROPERTY_RANDR_TILE
	Type:			INTEGER
	Format:			32
	Num items:		8
	Flags:			Immutable
	Range/List:		-

        Tile monitors have an array of values describing the tiling,
        based on DisplayID v1.3

	The 8 elements are:
        0: group id - The tile group identifier
        1: flags - flags for tile group
		0x1 = single monitor enclosure
        2: number of horizontal tiles in tile group
        3: number of vertical tiles in tile group
        4: horizontal tile location for this tile
        5: vertical tile location for this tile
        6: horizontal tile size for this tile
        7: vertical tile size for this tile

9.2 Properties introduced with version 1.2 of the RandR extension

Property			Immutable	Mandatory since
────────			─────────	───────────────
EDID				yes		n/a

EDID is provided by the RandR frontend, thus not driver specific.


9.3 Properties introduced with version 1.3 of the RandR extension

Property			Immutable	Mandatory since
────────			─────────	───────────────
CloneList			yes		not mandatory
CompatibilityList		yes		not mandatory
ConnectorNumber			yes: static	not mandatory
ConnectorType			yes: static	RandR 1.3
SignalFormat			no		RandR 1.3
SignalProperties		no		not mandatory

9.4 Properties introduced with version 1.3.1 of the RandR extension

Property			Immutable	Mandatory since
────────			─────────	───────────────
Backlight			no		not mandatory

9.5 Properties introduced with version 1.4.0 of the RandR extension

Property			Immutable	Mandatory since
────────			─────────	───────────────
Border				yes		not mandatory
BorderDimensions		yes: static	not mandatory

9.6 Properties introduced with version 1.4.1 of the RandR extension

Property			Immutable	Mandatory since
────────			─────────	───────────────
GUID				yes		not mandatory

9.7 Properties introduced with version 1.5 of the RandR extension

Property			Immutable	Mandatory since
────────			─────────	───────────────
TILE				yes		not mandatory

9.8 Properties introduced with version 1.6 of the RandR extension

Property			Immutable	Mandatory since
────────			─────────	───────────────
non-desktop			yes		not mandatory

			      ❧❧❧❧❧❧❧❧❧❧❧

10. Extension Versioning

The RandR extension was developed in parallel with the implementation
to ensure the feasibility of various portions of the design. As
portions of the extension are implemented, the version number of the
extension has changed to reflect the portions of the standard provided.
This document describes the version 1.4 of the specification, the
partial implementations have version numbers less than that. Here's a
list of what each version provided:

	0.0: This prototype implemented resize and rotation in the
	     TinyX server Used approximately the protocol described in
	     the Usenix paper. Appeared in the TinyX server in
	     XFree86 4.2, but not in the XFree86 main server.

	0.1: Added subpixel order, added an event for subpixel order.
	     This version was never checked in to XFree86 CVS.

	1.0: Implements resize, rotation, and reflection. Implemented
	     both in the XFree86 main server (size change only at this
	     date), and fully (size change, rotation, and reflection)
	     in XFree86's TinyX server.

	1.1: Added refresh rates

	1.2: Separate screens from CRTCs and outputs, switch to full VESA
	     modes

	1.3: Added cheap version of RRGetScreenResources.  Added CRTC
	     transformations.  Added panning.  Added primary outputs.
	     Added standard properties.

        1.4: Added provider objects for handling multi-GPU systems.

	1.5: Added Monitors

	1.6: Added Leases and non-desktop output information.

Compatibility between 0.0 and 1.0 was *NOT* preserved, and 0.0 clients
will fail against 1.0 servers. The wire encoding op-codes were
changed for GetScreenInfo to ensure this failure in a relatively
graceful way. Version 1.1 servers and clients are cross compatible with
1.0. Version 1.1 is considered to be stable and we intend upward
compatibility from this point. Version 1.2 offers an extended model of the
system with multiple output support. Version 1.3 adds a cheap version of
GetScreenResources to avoid expensive DDC operations, CRTC transformations,
panning, and the primary output concept. Versions 1.2 through 1.6 are
backward-compatible with 1.1.

			      ❧❧❧❧❧❧❧❧❧❧❧

11. Relationship with other extensions

Two other extensions have a direct relationship with this extension. This
section attempts to explain how these three are supposed to work together.

11.1 XFree86-VidModeExtension

XFree86-VidModeExtension changes the configuration of a single monitor
attached to the screen without changing the configuration of the screen
itself. It provides the ability to specify new mode lines for the server to
use along with selecting among existing mode lines. As it uses screen
numbers instead of window identifiers, it can be used to affect multiple
monitors in a single-screen Xinerama configuration. However, the association
between screen numbers and root windows in a multi-Screen environment is not
defined by the extension. Version 2.0 of this extension added the ability to
adjust the DAC values in a TrueColor server to modify the brightness curves
of the display.

All of the utility of this extension is subsumed by RandR version 1.2, RandR
should be used in preference to XFree86-VidModeExtension where both are
present.

11.2 Xinerama

Xinerama provides a mechanism for describing the relationship between the
overall screen display and monitors placed within that area. As such, it
provides the query functionality of RandR 1.2 without any of the
configuration functionality. Applications using Xinerama to discover
monitor geometry can continue to do so, with the caveat that they will not be
informed of changes when they occur. However, Xinerama configuration data
will be updated, so applications selecting for RandR notification and
re-querying the configuration with the Xinerama extension will get updated
information. It is probably better to view RandR as a superset of Xinerama
at this point and use it in preference to Xinerama where both are present.

			      ❧❧❧❧❧❧❧❧❧❧❧

Appendix A. Protocol Encoding

Syntactic Conventions

This document uses the same syntactic conventions as the core X
protocol encoding document.

A.1 Common Types

┌───
    ROTATION
	0x0001	Rotate_0
	0x0002	Rotate_90
	0x0004	Rotate_180
	0x0008	Rotate_270
	0x0010	Reflect_X
	0x0020	Reflect_Y
└───
	Used to encode both sets of possible rotations and individual
	selected rotations.

┌───
    RRSELECTMASK
	0x0001	ScreenChangeNotifyMask
	0x0002	CrtcChangeNotifyMask		Added in version 1.2
	0x0004	OutputChangeNotifyMask		Added in version 1.2
	0x0008	OutputPropertyNotifyMask	Added in version 1.2
	0x0010	ProviderChangeNotifyMask 	Added in version 1.4
	0x0020	ProviderPropertyNotifyMask	Added in version 1.4
	0x0040	ResourceChangeNotifyMask	Added in version 1.4
	0x0080  LeaseNotifyMask                 Added in version 1.6

└───
      Event select mask for RRSelectInput

┌───
    RRCONFIGSTATUS
	0x0 Success
	0x1 InvalidConfigTime
	0x2 InvalidTime
	0x3 Failed
└───
	Return status for requests which depend on time.

┌───
    MODEINFO (32)				Added in version 1.2
	4	CARD32		id
	2	CARD16		width in pixels
	2	CARD16		height in pixels
	4	CARD32		dot clock
	2	CARD16		h sync start
	2	CARD16		h sync end
	2	CARD16		h total
	2	CARD16		h skew
	2	CARD16		v sync start
	2	CARD16		v sync end
	2	CARD16		v total
	2	CARD16		name length
	4	SETofMODEFLAG	mode flags
└───

	An output mode specifies the complete CRTC timings for
	a specific mode. The vertical and horizontal synchronization rates
	can be computed given the dot clock and the h total/v total
	values. If the dot clock is zero, then all of the timing
	parameters and flags are not used, and must be zero as this
	indicates that the timings are unknown or otherwise unused.
	The name itself will be encoded separately in each usage.

┌───
    MODEFLAG
	0x00000001	HSyncPositive
	0x00000002	HSyncNegative
	0x00000004	VSyncPositive
	0x00000008	VSyncNegative
	0x00000010	Interlace
	0x00000020	DoubleScan
	0x00000040	CSync
	0x00000080	CSyncPositive
	0x00000100	CSyncNegative
	0x00000200	HSkewPresent
	0x00000400	BCast
	0x00000800	PixelMultiplex
	0x00001000	DoubleClock
	0x00002000	ClockDivideBy2
└───
┌───
    CONNECTION
	0		Connected
	1		Disconnected
	2		UnknownConnection
└───

┌───
    PROVIDER_CAPS				Added in version 1.4
	0x00000001	SourceOutput
	0x00000002	SinkOutput
	0x00000004	SourceOffload
	0x00000008	SinkOffload
└───

A.1.1 Common Types added in version 1.5 of the protocol

┌───
    MONITORINFO (16 + 4*n)
	4	ATOM		name
	1	BOOL		primary
	1	BOOL		automatic
	2	CARD16		noutputs
	2	INT16		x
	2	INT16		y
	2	CARD16		width in pixels
	2	CARD16		height in pixels
	4	CARD32		width in millimeters
	4	CARD32		height in millimeters
	4*n	OUTPUT		outputs
└───

A.2 Protocol Requests

Opcodes 1 and 3 were used in the 0.0 protocols, and will return
errors if used in version 1.0.

┌───
    RRQueryVersion

	1	CARD8			major opcode
	1	0			RandR opcode
	2	3			length
	4	CARD32			major version
	4	CARD32			minor version
	1	1			Reply
	1				unused
	2	CARD16			sequence number
	4	0			reply length
	1	CARD32			major version
	1	CARD32			minor version
└───
┌───
    RRSetScreenConfig

	1	CARD8			major opcode
	1	2			RandR opcode
	2	6			length
	4	WINDOW			window on screen to be configured
	4	TIMESTAMP		timestamp
	4	TIMESTAMP		config timestamp
	2	SIZEID			size index
	2	ROTATION		rotation/reflection
	2	CARD16			refresh rate (1.1 only)
	2	CARD16			pad
	1	1			Reply
	1	RRCONFIGSTATUS		status
	2	CARD16			sequence number
	4	0			reply length
	4	TIMESTAMP		new timestamp
	4	TIMESTAMP		new configuration timestamp
	4	WINDOW			root
	2	SUBPIXELORDER		subpixel order defined in Render
	2	CARD16			pad4
	4	CARD32			pad5
	4	CARD32			pad6
└───
┌───
    RRSelectInput

	1	CARD8			major opcode
	1	4			RandR opcode
	2	3			length
	4	WINDOW			window
	2	SETofRRSELECTMASK	enable
	2	CARD16			pad
└───
┌───
    RRGetScreenInfo

	1	CARD8			major opcode
	1	5			RandR opcode
	2	2			length
	4	WINDOW			window
	1	1			Reply
	1	CARD8			set of Rotations
	2	CARD16			sequence number
	4	0			reply length
	4	WINDOW			root window
	4	TIMESTAMP		timestamp
	4	TIMESTAMP		config timestamp
	2	CARD16			number of SCREENSIZE following
	2	SIZEID			current size index
	2	ROTATION		current rotation and reflection
	2	CARD16			current rate (added in version 1.1)
	2	CARD16			length of rate info (number of CARD16s)
	2	CARD16			pad

	SCREENSIZE
	2	CARD16			width in pixels
	2	CARD16			height in pixels
	2	CARD16			width in millimeters
	2	CARD16			height in millimeters

	REFRESH
	2	CARD16			number of rates (n)
	2n	CARD16			rates
└───

A.2.1 Protocol Requests added with version 1.2

┌───
    RRGetScreenSizeRange
	1	CARD8			major opcode
	1	6			RandR opcode
	2	2			length
	4	WINDOW			window
	1	1			Reply
	1				unused
	2	CARD16			sequence number
	4	0			reply length
	2	CARD16			minWidth
	2	CARD16			minHeight
	2	CARD16			maxWidth
	2	CARD16			maxHeight
	16				unused
└───
┌───
    RRSetScreenSize
	1	CARD8			major opcode
	1	7			RandR opcode
	2	5			length
	4	WINDOW			window
	2	CARD16			width
	2	CARD16			height
	4	CARD32			width in millimeters
	4	CARD32			height in millimeters
└───
┌───
    RRGetScreenResources
	1	CARD8			major opcode
	1	8			RandR opcode
	2	2			length
	4	WINDOW			window
	1	1			Reply
	1				unused
	2	CARD16			sequence number
	4	c+o+8m+(b+p)/4		reply length
	4	TIMESTAMP		timestamp
	4	TIMESTAMP		config-timestamp
	2	c			number of CRTCs
	2	o			number of outputs
	2	m			number of modeinfos
	2	b			total bytes in mode names
	8				unused
	4c	LISTofCRTC		crtcs
	4o	LISTofOUTPUT		outputs
	32m	LISTofMODEINFO		modeinfos
	b	STRING8			mode names
	p				unused, p=pad(b)
└───
┌───
    RRGetOutputInfo
	1	CARD8			major opcode
	1	9			RandR opcode
	2	3			length
	4	OUTPUT			output
	4	TIMESTAMP		config-timestamp
	1	1			Reply
	1	RRCONFIGSTATUS		status
	2	CARD16			sequence number
	4	1+c+m+(n+p)/4		reply length
	4	TIMESTAMP		timestamp
	4	CRTC			current connected crtc
	4	CARD32			width in millimeters
	4	CARD32			height in millimeters
	1	CONNECTION		connection
	1	SUBPIXELORDER		subpixel-order
	2	c			number of CRTCs
	2	m			number of modes
	2	p			number of preferred modes
	2	o			number of clones
	2	n			length of name
	4c	LISTofCRTC		crtcs
	4m	LISTofMODE		modes
	4o	LISTofOUTPUT		clones
	n	STRING8			name
	p				unused, p=pad(n)
└───
┌───
    RRListOutputProperties
	1	CARD8			major opcode
	1	10			RandR opcode
	2	2			length
	4	OUTPUT			output
	1	1			Reply
	1				unused
	2	CARD16			sequence number
	4	n			reply length
	2	n			number of ATOMs in atoms
	22				unused
	4n	LISTofATOM		atoms
└───
┌───
    RRQueryOutputProperty
	1	CARD8			major opcode
	1	11			RandR opcode
	2	3			request length
	4	OUTPUT			output
	4	ATOM			property
	1	1			Reply
	1				unused
	2	CARD16			sequence number
	4	n			reply length
	1	BOOL			pending
	1	BOOL			range
	1	BOOL			immutable
	21				unused
	4n	LISTofINT32		valid values
└───
┌───
    RRConfigureOutputProperty
	1	CARD8			major opcode
	1	12			RandR opcode
	2	4+n			request length
	4	OUTPUT			output
	4	ATOM			property
	1	BOOL			pending
	1	BOOL			range
	2				unused
	4n	LISTofINT32		valid values
└───
┌───
    RRChangeOutputProperty
	1	CARD8			major opcode
	1	13			RandR opcode
	2	6+(n+p)/4		request length
	4	OUTPUT			output
	4	ATOM			property
	4	ATOM			type
	1	CARD8			format
	1				mode
		0	Replace
		1	Prepend
		2	Append
	2				unused
	4	CARD32			length of data in format units
					(= n for format = 8)
					(= n/2 for format = 16)
					(= n/4 for format = 32)
	n	LISTofBYTE		data
					(n is a multiple of 2 for format = 16)
					(n is a multiple of 4 for format = 32)
	p				unused, p=pad(n)
└───
┌───
    RRDeleteOutputProperty
	1	CARD8			major opcode
	1	14			RandR opcode
	2	3			request length
	4	OUTPUT			output
	4	ATOM			property
└───
┌───
    RRGetOutputProperty
	1	CARD8			major opcode
	1	15			RandR opcode
	2	7			request length
	4	OUTPUT			output
	4	ATOM			property
	4	ATOM			type
		0	AnyPropertyType
	4	CARD32			long-offset
	4	CARD32			long-length
	1	BOOL			delete
	1	BOOL			pending
	2				unused
	1	1			Reply
	1	CARD8			format
	2	CARD16			sequence number
	4	(n+p)/4			reply length
	4	ATOM			type
		0	None
	4	CARD32			bytes-after
	4	CARD32			length of value in format units
					(= 0 for format = 0)
					(= n for format = 8)
					(= n/2 for format = 16)
					(= n/4 for format = 32)
	12				unused
	n	LISTofBYTE		value
					(n is zero for format = 0)
					(n is a multiple of 2 for format = 16)
					(n is a multiple of 4 for format = 32)
	p				unused, p=pad(n)
└───
┌───
    RRCreateMode
	1	CARD8			major opcode
	1	16			RandR opcode
	2	10+(n+p)/4		length
	4	WINDOW			window
	32	MODEINFO		mode
	n	STRING8			mode name
	p				unused, p=pad(n)
	1	1			Reply
	1				unused
	2	CARD16			sequence number
	4	0			reply length
	4	MODE			mode
	20				unused
└───
┌───
    RRDestroyMode
	1	CARD8			major opcode
	1	17			RandR opcode
	2	2			length
	4	MODE			mode
└───
┌───
    RRAddOutputMode
	1	CARD8			major opcode
	1	18			RandR opcode
	2	3			length
	4	OUTPUT			output
	4	MODE			mode
└───
┌───
    RRDeleteOutputMode
	1	CARD8			major opcode
	1	19			RandR opcode
	2	3			length
	4	OUTPUT			output
	4	MODE			mode
└───
┌───
    RRGetCrtcInfo
	1	CARD8			major opcode
	1	20			RandR opcode
	2	3			length
	4	CRTC			crtc
	4	TIMESTAMP		config-timestamp
	1	1			Reply
	1	RRCONFIGSTATUS		status
	2	CARD16			sequence number
	4	o+p			reply length
	4	TIMESTAMP		timestamp
	2	INT16			x
	2	INT16			y
	2	CARD16			width
	2	CARD16			height
	4	MODE			mode
	2	ROTATION		current rotation and reflection
	2	ROTATION		set of possible rotations
	2	o			number of outputs
	2	p			number of possible outputs
	4o	LISTofOUTPUT		outputs
	4p	LISTofOUTPUT		possible outputs
└───
┌───
    RRSetCrtcConfig
	1	CARD8			major opcode
	1	21			RandR opcode
	2	7+n			length
	4	CRTC			crtc
	4	TIMESTAMP		timestamp
	4	TIMESTAMP		config timestamp
	2	INT16			x
	2	INT16			y
	4	MODE			mode
	2	ROTATION		rotation/reflection
	2				unused
	4n	LISTofOUTPUT		outputs
	1	1			Reply
	1	RRCONFIGSTATUS		status
	2	CARD16			sequence number
	4	0			reply length
	4	TIMESTAMP		new timestamp
	20				unused
└───
┌───
    RRGetCrtcGammaSize
	1	CARD8			major opcode
	1	22			RandR opcode
	2	2			length
	4	CRTC			crtc
	1	1			Reply
	1				unused
	2	CARD16			sequence number
	4	0			reply length
	2	CARD16			size
	22				unused
└───
┌───
    RRGetCrtcGamma
	1	CARD8			major opcode
	1	23			RandR opcode
	2	2			length
	4	CRTC			crtc
	1	1			Reply
	1				unused
	2	CARD16			sequence number
	4	(6n+p)/4		reply length
	2	n			size
	20				unused
	2n	LISTofCARD16		red
	2n	LISTofCARD16		green
	2n	LISTofCARD16		blue
	p				unused, p=pad(6n)
└───
┌───
    RRSetCrtcGamma
	1	CARD8			major opcode
	1	24			RandR opcode
	2	3+(6n+p)/4		length
	4	CRTC			crtc
	2	n			size
	2				unused
	2n	LISTofCARD16		red
	2n	LISTofCARD16		green
	2n	LISTofCARD16		blue
	p				unused, p=pad(6n)
└───

A.2.2 Protocol Requests added with version 1.3

┌───
    RRGetScreenResourcesCurrent
	1	CARD8			major opcode
	1	25			RandR opcode
	2	2			length
	4	WINDOW			window
	1	1			Reply
	1				unused
	2	CARD16			sequence number
	4	c+o+8m+(b+p)/4		reply length
	4	TIMESTAMP		timestamp
	4	TIMESTAMP		config-timestamp
	2	c			number of CRTCs
	2	o			number of outputs
	2	m			number of modeinfos
	2	b			total bytes in mode names
	8				unused
	4c	LISTofCRTC		crtcs
	4o	LISTofOUTPUT		outputs
	32m	LISTofMODEINFO		modeinfos
	b	STRING8			mode names
	p				unused, p=pad(b)
└───

┌───
    RRSetCrtcTransform
	1	CARD8			major opcode
	1	26			RandR opcode
	2	12+(n+p)/4+v		length
	4	CRTC			crtc
	36	TRANSFORM		transform
	2	CARD16			filter length
	2				unused
	n	STRING8			filter name
	p				unused, p=pad(n)
	4v	FIXED			filter params
└───

┌───
    RRGetCrtcTransform
	1	CARD8			major opcode
	1	27			RandR opcode
	2	2			length
	4	CRTC			crtc
	1	1			Reply
	1				unused
	2	CARD16			sequence number
	4	16+(pn+pnp)/4+(cn+cnp)/4+pf+cf	reply length
	36	TRANSFORM		pending transform
	1	BOOL			has transforms
	3				unused
	36	TRANSFORM		current transform
	4				unused
	2	pn			pending filter name length
	2	pf			pending filter num params
	2	cn			current filter name length
	2	cf			current filter num params
	pn	STRING8			pending filter name
	pnp				unused, pnp=pad(pn)
	4*pf	FIXED			pending filter params
	cn	STRING8			current filter name
	cnp				unused, cnp=pad(cn)
	4*cf	FIXED			current filter params
└───

┌───
    RRGetPanning
	1	CARD8			major opcode
	1	28			RandR opcode
	2	2			length
	4	CRTC			crtc
	1	1			Reply
	1	RRCONFIGSTATUS		status
	2	CARD16			sequence number
	4	1			reply length
	4	TIMESTAMP		timestamp
	2	CARD16			left
	2	CARD16			top
	2	CARD16			width
	2	CARD16			height
	2	CARD16			track_left
	2	CARD16			track_top
	2	CARD16			track_width
	2	CARD16			track_height
	2	INT16			border_left
	2	INT16			border_top
	2	INT16			border_right
	2	INT16			border_bottom
└───
┌───
    RRSetPanning
	1	CARD8			major opcode
	1	29			RandR opcode
	2	9			length
	4	CRTC			crtc
	4	TIMESTAMP		timestamp
	2	CARD16			left
	2	CARD16			top
	2	CARD16			width
	2	CARD16			height
	2	CARD16			track_left
	2	CARD16			track_top
	2	CARD16			track_width
	2	CARD16			track_height
	2	INT16			border_left
	2	INT16			border_top
	2	INT16			border_right
	2	INT16			border_bottom
	1	1			Reply
	1	RRCONFIGSTATUS		status
	2	CARD16			sequence number
	4	0			reply length
	4	TIMESTAMP		new timestamp
	20				unused
└───

┌───
    RRSetOutputPrimary
	1	CARD8			major opcode
	1	30			RandR opcode
	2	3			length
	4	WINDOW			window
	4	OUTPUT			output
└───

┌───
    RRGetOutputPrimary
	1	CARD8			major opcode
	1	31			RandR opcode
	2	2			length
	4	WINDOW			window
	1	1			Reply
	1				unused
	2	CARD16			sequence number
	4	CARD32			length
	4	OUTPUT			output
	4	CARD32			pad1
	4	CARD32			pad2
	4	CARD32			pad3
	4	CARD32			pad4
└───

A.2.3 Protocol Requests added with version 1.4

┌───
    RRGetProviders
	1	CARD8			major opcode
	1	32			RandR opcode
	2	2			length
	4	WINDOW			window
	1	1			Reply
	1				unused
	2	CARD16			sequence number
	4	p			length
	4	TIMESTAMP		timestamp
	2	p			number of Providers
	18				unused
	4p	LISTofPROVIDERS		providers
└───
┌───
    RRGetProviderInfo
	1	CARD8			major opcode
	1	33			RandR opcode
	2	3			length
	4	PROVIDER		provider
	4	TIMESTAMP		config-timestamp
	1	1			Reply
	1	RRCONFIGSTATUS		status
	2	CARD16			sequence number
	4	1+c+o+(a*2)+(n+p)/4		reply length
	4	TIMESTAMP		timestamp
	4	CARD32			capabilities
	2	c			number of crtcs
	2	o 			number of outputs
	2	a 			number of associated providers
	2	n			length of name
	8       			unused
	4c	LISTofCRTC		crtcs
	4o	LISTofOUTPUT		outputs
	4a	LISTofPROVIDER		associated providers
	4a	CARD32			associated provider capability
	n	STRING8			name
	p				unused, p=pad(n)
└───
┌───
    RRSetProviderOffloadSink
	1	CARD8			major opcode
	1	34			RandR opcode
	2	4			length
	4	PROVIDER		provider
	4	PROVIDER		offload sink provider
	4	TIMESTAMP		timestamp
└───
┌───
    RRSetProviderOutputSource
	1	CARD8			major opcode
	1	35			RandR opcode
	2	4			length
	4	PROVIDER		provider
	4	PROVIDER		output source provider
	4	TIMESTAMP		timestamp
└───
┌───
    RRListProviderProperties
	1	CARD8			major opcode
	1	36			RandR opcode
	2	2			length
	4	PROVIDER		provider
	1	1			Reply
	1				unused
	2	CARD16			sequence number
	4	n			reply length
	2	n			number of ATOMs in atoms
	22				unused
	4n	LISTofATOM		atoms
└───
┌───
    RRQueryProviderProperty
	1	CARD8			major opcode
	1	37			RandR opcode
	2	3			request length
	4	PROVIDER		provider
	4	ATOM			property
	1	1			Reply
	1				unused
	2	CARD16			sequence number
	4	n			reply length
	1	BOOL			pending
	1	BOOL			range
	1	BOOL			immutable
	21				unused
	4n	LISTofINT32		valid values
└───
┌───
    RRConfigureProviderProperty
	1	CARD8			major opcode
	1	38			RandR opcode
	2	4+n			request length
	4	PROVIDER		provider
	4	ATOM			property
	1	BOOL			pending
	1	BOOL			range
	2				unused
	4n	LISTofINT32		valid values
└───
┌───
    RRChangeProviderProperty
	1	CARD8			major opcode
	1	39			RandR opcode
	2	6+(n+p)/4		request length
	4	PROVIDER		provider
	4	ATOM			property
	4	ATOM			type
	1	CARD8			format
	1				mode
		0	Replace
		1	Prepend
		2	Append
	2				unused
	4	CARD32			length of data in format units
					(= n for format = 8)
					(= n/2 for format = 16)
					(= n/4 for format = 32)
	n	LISTofBYTE		data
					(n is a multiple of 2 for format = 16)
					(n is a multiple of 4 for format = 32)
	p				unused, p=pad(n)
└───
┌───
    RRDeleteProviderProperty
	1	CARD8			major opcode
	1	40			RandR opcode
	2	3			request length
	4	PROVIDER		provider
	4	ATOM			property
└───
┌───
    RRGetProviderProperty
	1	CARD8			major opcode
	1	41			RandR opcode
	2	7			request length
	4	PROVIDER		provider
	4	ATOM			property
	4	ATOM			type
		0	AnyPropertyType
	4	CARD32			long-offset
	4	CARD32			long-length
	1	BOOL			delete
	1	BOOL			pending
	2				unused
	1	1			Reply
	1	CARD8			format
	2	CARD16			sequence number
	4	(n+p)/4			reply length
	4	ATOM			type
		0	None
	4	CARD32			bytes-after
	4	CARD32			length of value in format units
					(= 0 for format = 0)
					(= n for format = 8)
					(= n/2 for format = 16)
					(= n/4 for format = 32)
	12				unused
	n	LISTofBYTE		value
					(n is zero for format = 0)
					(n is a multiple of 2 for format = 16)
					(n is a multiple of 4 for format = 32)
	p				unused, p=pad(n)
└───

A.2.4 Protocol Requests added with version 1.5

┌───
    RRGetMonitors
	1	CARD8			major opcode
	1	42			RandR opcode
	2	2			request length
	4	WINDOW			window
	1	1			Reply
	1				unused
	2	CARD16			sequence number
	4	6*n + o			reply length
	4	TIMESTAMP		timestamp
	4	n			nmonitors
	4	o			noutputs
	12				unused
	n*24+o*4 LISTofMONITORINFO	monitors
└───
┌───
    RRSetMonitor
	1	CARD8			major opcode
	1	43			RandR opcode
	2	6 + o			request length
	4	WINDOW			window
	24+o	MONITORINFO		monitorinfo
└───
┌───
    RRDeleteMonitor
	1	CARD8			major opcode
	1	44			RandR opcode
	2	3			request length
	4	WINDOW			window
	4	ATOM			name
└───

A.3 Protocol Events

┌───
    RRScreenChangeNotify
	1	Base + 0		code
	1	ROTATION		new rotation and reflection
	2	CARD16			sequence number
	4	TIMESTAMP		timestamp
	4	TIMESTAMP		configuration timestamp
	4	WINDOW			root window
	4	WINDOW			request window
	2	SIZEID			size ID
	2	SUBPIXELORDER		subpixel order defined in Render
	2	CARD16			width in pixels
	2	CARD16			height in pixels
	2	CARD16			width in millimeters
	2	CARD16			height in millimeters
└───

A.3.1 Protocol Events added with version 1.2

┌───
    RRCrtcChangeNotify
	1	Base + 1		code
	1	0			sub-code
	2	CARD16			sequence number
	4	TIMESTAMP		timestamp
	4	WINDOW			request window
	4	CRTC			crtc affected
	4	MODE			mode in use
	2	ROTATION		new rotation and reflection
	2				unused
	2	INT16			x
	2	INT16			y
	2	CARD16			width
	2	CARD16			height
└───
┌───
    RROutputChangeNotify
	1	Base + 1		code
	1	1			sub-code
	2	CARD16			sequence number
	4	TIMESTAMP		timestamp
	4	TIMESTAMP		configuration timestamp
	4	WINDOW			request window
	4	OUTPUT			output affected
	4	CRTC			crtc in use
	4	MODE			mode in use
	2	ROTATION		rotation in use
	1	CONNECTION		connection status
	1	SUBPIXELORDER		subpixel order
└───
┌───
    RROutputPropertyNotify
	1	Base + 1		code
	1	2			sub-code
	2	CARD16			sequence number
	4	WINDOW			window
	4	OUTPUT			output
	4	ATOM			atom
	4	TIMESTAMP		time
	1				state
		0	NewValue
		1	Deleted
	11				unused
└───

A.3.2 Protocol Events added with version 1.4
┌───
    RRProviderChangeNotify
	1	Base + 1		code
	1	3			sub-code
	2	CARD16			sequence number
	4	TIMESTAMP		timestamp
	4	WINDOW			request window
	4	PROVIDER		provider affected
	16				unused
└───
┌───
    RRProviderPropertyNotify
	1	Base + 1		code
	1	4			sub-code
	2	CARD16			sequence number
	4	WINDOW			window
	4	PROVIDER		provider
	4	ATOM			atom
	4	TIMESTAMP		time
	1				state
		0	NewValue
		1	Deleted
	11				unused
└───
┌───
    RRResourceChangeNotify
	1	Base + 1		code
	1	5			sub-code
	2	CARD16			sequence number
	4	TIMESTAMP		time
	4	WINDOW			window
	20				unused
└───
A.4 Protocol Errors

┌───
    ERRORS
	Base + 0		Output
	Base + 1		Crtc
	Base + 2		Mode
	Base + 3		Provider
└───

Bibliography

[RANDR] Gettys, Jim and Keith Packard, "The X Resize and Rotate
	Extension - RandR", Proceedings of the 2001 USENIX Annual
	Technical Conference, Boston, MA

[RENDER]
	Packard, Keith, "The X Rendering Extension", work in progress,
	http://cgit.freedesktop.org/xorg/proto/renderproto/tree/renderproto.txt