summaryrefslogtreecommitdiffstats
path: root/twin/compton-tde/common.h
blob: 6f61e78220203e17a52e3189d13d47fc4a49c226 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
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
/*
 * Compton - a compositor for X11
 *
 * Based on `xcompmgr` - Copyright (c) 2003, Keith Packard
 *
 * Copyright (c) 2011-2013, Christopher Jeffrey
 * Copyright (c) 2014 Timothy Pearson <kb9vqf@pearsoncomputing.net>
 * See LICENSE for more information.
 *
 */

#ifndef COMPTON_COMMON_H
#define COMPTON_COMMON_H

#include "compton_config.h"

// === Options ===

// Debug options, enable them using -D in CFLAGS
// #define DEBUG_REPAINT    1
// #define DEBUG_EVENTS     1
// #define DEBUG_RESTACK    1
// #define DEBUG_WINTYPE    1
// #define DEBUG_CLIENTWIN  1
// #define DEBUG_WINDATA    1
// #define DEBUG_WINMATCH   1
// #define DEBUG_REDIR      1
// #define DEBUG_ALLOC_REG  1
// #define DEBUG_FRAME      1
// #define DEBUG_LEADER     1
// #define DEBUG_C2         1
// #define DEBUG_GLX        1
// #define DEBUG_GLX_GLSL   1
// #define DEBUG_GLX_ERR    1
// #define DEBUG_GLX_MARK   1
// #define DEBUG_GLX_PAINTREG 1
// #define MONITOR_REPAINT  1

// Whether to enable PCRE regular expression support in blacklists, enabled
// by default
// #define CONFIG_REGEX_PCRE 1
// Whether to enable JIT support of libpcre. This may cause problems on PaX
// kernels.
// #define CONFIG_REGEX_PCRE_JIT 1
// Whether to enable parsing of configuration files using libconfig.
// #define CONFIG_LIBCONFIG 1
// Whether we are using a legacy version of libconfig (1.3.x).
// #define CONFIG_LIBCONFIG_LEGACY 1
// Whether to enable DRM VSync support
// #define CONFIG_VSYNC_DRM 1
// Whether to enable OpenGL support
// #define CONFIG_VSYNC_OPENGL 1
// Whether to enable GLX GLSL support
// #define CONFIG_VSYNC_OPENGL_GLSL 1
// Whether to enable GLX FBO support
// #define CONFIG_VSYNC_OPENGL_FBO 1
// Whether to enable DBus support with libdbus.
// #define CONFIG_DBUS 1
// Whether to enable condition support.
// #define CONFIG_C2 1
// Whether to enable X Sync support.
// #define CONFIG_XSYNC 1
// Whether to enable GLX Sync support.
// #define CONFIG_GLX_XSYNC 1

// TDE specific options
// #define USE_ENV_HOME 1
#define WRITE_PID_FILE 1
#define _TDE_COMP_MGR_VERSION_ 3.00
#if defined(HAVE_LIBCONFIG_OLD_API)
#define CONFIG_LIBCONFIG_LEGACY 1
#endif

#if !defined(CONFIG_C2) && defined(DEBUG_C2)
#error Cannot enable c2 debugging without c2 support.
#endif

#if (!defined(CONFIG_XSYNC) || !defined(CONFIG_VSYNC_OPENGL)) && defined(CONFIG_GLX_SYNC)
#error Cannot enable GL sync without X Sync / OpenGL support.
#endif

#ifndef COMPTON_VERSION
#define COMPTON_VERSION "unknown"
#endif

// === Includes ===

// For some special functions
#define _GNU_SOURCE

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <sys/poll.h>
#include <assert.h>
#include <time.h>
#include <ctype.h>
#include <sys/time.h>

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <X11/extensions/Xcomposite.h>
#include <X11/extensions/Xdamage.h>
#include <X11/extensions/Xrender.h>
#include <X11/extensions/shape.h>
#include <X11/extensions/Xdbe.h>
#ifdef CONFIG_XSYNC
#include <X11/extensions/sync.h>
#endif

#ifdef CONFIG_XRANDR
#include <X11/extensions/Xrandr.h>
#endif

#ifdef CONFIG_XINERAMA
#include <X11/extensions/Xinerama.h>
#endif

// Workarounds for missing definitions in very old versions of X headers,
// thanks to consolers for reporting
#ifndef PictOpDifference
#define PictOpDifference 0x39
#endif

// libconfig
#ifdef CONFIG_LIBCONFIG
#include <libgen.h>
#include <libconfig.h>
#endif

// libdbus
#ifdef CONFIG_DBUS
#include <dbus/dbus.h>
#endif

// libGL
#ifdef CONFIG_VSYNC_OPENGL
#if defined(CONFIG_VSYNC_OPENGL_GLSL) || defined(CONFIG_VSYNC_OPENGL_FBO)
#define GL_GLEXT_PROTOTYPES
#endif

#include <GL/glx.h>

// Workarounds for missing definitions in some broken GL drivers, thanks to
// douglasp and consolers for reporting
#ifndef GL_TEXTURE_RECTANGLE
#define GL_TEXTURE_RECTANGLE 0x84F5
#endif

#ifndef GLX_BACK_BUFFER_AGE_EXT
#define GLX_BACK_BUFFER_AGE_EXT 0x20F4
#endif

#endif

// === Macros ===

#define MSTR_(s)        #s
#define MSTR(s)         MSTR_(s)

/// @brief Wrapper for gcc branch prediction builtin, for likely branch.
#define likely(x)    __builtin_expect(!!(x), 1)

/// @brief Wrapper for gcc branch prediction builtin, for unlikely branch.
#define unlikely(x)  __builtin_expect(!!(x), 0)

/// Print out an error message.
#define printf_err(format, ...) \
  fprintf(stderr, format "\n", ## __VA_ARGS__)

/// Print out an error message with function name.
#define printf_errf(format, ...) \
  printf_err("%s" format,  __func__, ## __VA_ARGS__)

/// Print out an error message with function name, and quit with a
/// specific exit code.
#define printf_errfq(code, format, ...) { \
  printf_err("%s" format,  __func__, ## __VA_ARGS__); \
  exit(code); \
}

/// Print out a debug message.
#define printf_dbg(format, ...) \
  printf(format, ## __VA_ARGS__); \
  fflush(stdout)

/// Print out a debug message with function name.
#define printf_dbgf(format, ...) \
  printf_dbg("%s" format, __func__, ## __VA_ARGS__)

// Use #s here to prevent macro expansion
/// Macro used for shortening some debugging code.
#define CASESTRRET(s)   case s: return #s

// === Constants ===
#if !(COMPOSITE_MAJOR > 0 || COMPOSITE_MINOR >= 2)
#error libXcomposite version unsupported
#endif

/// @brief Length of generic buffers.
#define BUF_LEN 80

#define ROUNDED_PERCENT 0.05
#define ROUNDED_PIXELS  10

#define OPAQUE 0xffffffff
#define REGISTER_PROP "_NET_WM_CM_S"

#define TIME_MS_MAX LONG_MAX
#define FADE_DELTA_TOLERANCE 0.2
#define SWOPTI_TOLERANCE 3000
#define TIMEOUT_RUN_TOLERANCE 0.05
#define WIN_GET_LEADER_MAX_RECURSION 20

#define SEC_WRAP (15L * 24L * 60L * 60L)

#define NS_PER_SEC 1000000000L
#define US_PER_SEC 1000000L
#define MS_PER_SEC 1000

#define XRFILTER_CONVOLUTION  "convolution"
#define XRFILTER_GUASSIAN     "gaussian"
#define XRFILTER_BINOMIAL     "binomial"

/// @brief Maximum OpenGL FBConfig depth.
#define OPENGL_MAX_DEPTH 32

/// @brief Maximum OpenGL buffer age.
#define CGLX_MAX_BUFFER_AGE 5

/// @brief Maximum passes for blur.
#define MAX_BLUR_PASS 5

// Window flags

// Window size is changed
#define WFLAG_SIZE_CHANGE   0x0001
// Window size/position is changed
#define WFLAG_POS_CHANGE    0x0002
// Window opacity / dim state changed
#define WFLAG_OPCT_CHANGE   0x0004

// === Types ===

typedef uint32_t opacity_t;
typedef long time_ms_t;

typedef enum {
  WINTYPE_UNKNOWN,
  WINTYPE_DESKTOP,
  WINTYPE_DOCK,
  WINTYPE_TOOLBAR,
  WINTYPE_MENU,
  WINTYPE_UTILITY,
  WINTYPE_SPLASH,
  WINTYPE_DIALOG,
  WINTYPE_NORMAL,
  WINTYPE_DROPDOWN_MENU,
  WINTYPE_POPUP_MENU,
  WINTYPE_TOOLTIP,
  WINTYPE_NOTIFY,
  WINTYPE_COMBO,
  WINTYPE_DND,
  NUM_WINTYPES
} wintype_t;

/// Enumeration type to represent switches.
typedef enum {
  OFF,    // false
  ON,     // true
  UNSET
} switch_t;

/// Structure representing a X geometry.
typedef struct {
  int wid;
  int hei;
  int x;
  int y;
} geometry_t;

/// Enumeration type of window painting mode.
typedef enum {
  WMODE_TRANS,
  WMODE_SOLID,
  WMODE_ARGB
} winmode_t;

/// Structure representing needed window updates.
typedef struct {
  bool shadow       : 1;
  bool fade         : 1;
  bool focus        : 1;
  bool invert_color : 1;
} win_upd_t;

/// Structure representing Window property value.
typedef struct {
  // All pointers have the same length, right?
  // I wanted to use anonymous union but it's a GNU extension...
  union {
    unsigned char *p8;
    short *p16;
    long *p32;
  } data;
  unsigned long nitems;
  Atom type;
  int format;
} winprop_t;

typedef struct _ignore {
  struct _ignore *next;
  unsigned long sequence;
} ignore_t;

enum wincond_target {
  CONDTGT_NAME,
  CONDTGT_CLASSI,
  CONDTGT_CLASSG,
  CONDTGT_ROLE,
};

enum wincond_type {
  CONDTP_EXACT,
  CONDTP_ANYWHERE,
  CONDTP_FROMSTART,
  CONDTP_WILDCARD,
  CONDTP_REGEX_PCRE,
};

#define CONDF_IGNORECASE 0x0001

/// VSync modes.
typedef enum {
  VSYNC_NONE,
  VSYNC_DRM,
  VSYNC_OPENGL,
  VSYNC_OPENGL_OML,
  VSYNC_OPENGL_SWC,
  VSYNC_OPENGL_MSWC,
  NUM_VSYNC,
} vsync_t;

/// @brief Possible backends of compton.
enum backend {
  BKEND_XRENDER,
  BKEND_GLX,
  BKEND_XR_GLX_HYBRID,
  NUM_BKEND,
};

/// @brief Possible swap methods.
enum {
  SWAPM_BUFFER_AGE = -1,
  SWAPM_UNDEFINED = 0,
  SWAPM_COPY = 1,
  SWAPM_EXCHANGE = 2,
};

typedef struct _glx_texture glx_texture_t;

#ifdef CONFIG_VSYNC_OPENGL
#ifdef DEBUG_GLX_DEBUG_CONTEXT
typedef GLXContext (*f_glXCreateContextAttribsARB) (Display *dpy,
    GLXFBConfig config, GLXContext share_context, Bool direct,
    const int *attrib_list);
typedef void (*GLDEBUGPROC) (GLenum source, GLenum type,
    GLuint id, GLenum severity, GLsizei length, const GLchar* message,
    GLvoid* userParam);
typedef void (*f_DebugMessageCallback) (GLDEBUGPROC, void *userParam);
#endif

typedef int (*f_WaitVideoSync) (int, int, unsigned *);
typedef int (*f_GetVideoSync) (unsigned *);

typedef Bool (*f_GetSyncValuesOML) (Display* dpy, GLXDrawable drawable, int64_t* ust, int64_t* msc, int64_t* sbc);
typedef Bool (*f_WaitForMscOML) (Display* dpy, GLXDrawable drawable, int64_t target_msc, int64_t divisor, int64_t remainder, int64_t* ust, int64_t* msc, int64_t* sbc);

typedef int (*f_SwapIntervalSGI) (int interval);
typedef int (*f_SwapIntervalMESA) (unsigned int interval);

typedef void (*f_BindTexImageEXT) (Display *display, GLXDrawable drawable, int buffer, const int *attrib_list);
typedef void (*f_ReleaseTexImageEXT) (Display *display, GLXDrawable drawable, int buffer);

typedef void (*f_CopySubBuffer) (Display *dpy, GLXDrawable drawable, int x, int y, int width, int height);

#ifdef CONFIG_GLX_SYNC
// Looks like duplicate typedef of the same type is safe?
typedef int64_t GLint64;
typedef uint64_t GLuint64;
typedef struct __GLsync *GLsync;

#ifndef GL_SYNC_FLUSH_COMMANDS_BIT
#define GL_SYNC_FLUSH_COMMANDS_BIT 0x00000001
#endif

#ifndef GL_TIMEOUT_IGNORED
#define GL_TIMEOUT_IGNORED 0xFFFFFFFFFFFFFFFFull
#endif

#ifndef GL_ALREADY_SIGNALED
#define GL_ALREADY_SIGNALED 0x911A
#endif

#ifndef GL_TIMEOUT_EXPIRED
#define GL_TIMEOUT_EXPIRED 0x911B
#endif

#ifndef GL_CONDITION_SATISFIED
#define GL_CONDITION_SATISFIED 0x911C
#endif

#ifndef GL_WAIT_FAILED
#define GL_WAIT_FAILED 0x911D
#endif

typedef GLsync (*f_FenceSync) (GLenum condition, GLbitfield flags);
typedef GLboolean (*f_IsSync) (GLsync sync);
typedef void (*f_DeleteSync) (GLsync sync);
typedef GLenum (*f_ClientWaitSync) (GLsync sync, GLbitfield flags,
    GLuint64 timeout);
typedef void (*f_WaitSync) (GLsync sync, GLbitfield flags,
    GLuint64 timeout);
typedef GLsync (*f_ImportSyncEXT) (GLenum external_sync_type,
    GLintptr external_sync, GLbitfield flags);
#endif

#ifdef DEBUG_GLX_MARK
typedef void (*f_StringMarkerGREMEDY) (GLsizei len, const void *string);
typedef void (*f_FrameTerminatorGREMEDY) (void);
#endif

/// @brief Wrapper of a GLX FBConfig.
typedef struct {
  GLXFBConfig cfg;
  GLint texture_fmt;
  GLint texture_tgts;
  bool y_inverted;
} glx_fbconfig_t;

/// @brief Wrapper of a binded GLX texture.
struct _glx_texture {
  GLuint texture;
  GLXPixmap glpixmap;
  Pixmap pixmap;
  GLenum target;
  unsigned width;
  unsigned height;
  unsigned depth;
  bool y_inverted;
};
#endif

#ifdef CONFIG_VSYNC_OPENGL_GLSL
typedef struct {
  /// Fragment shader for blur.
  GLuint frag_shader;
  /// GLSL program for blur.
  GLuint prog;
  /// Location of uniform "offset_x" in blur GLSL program.
  GLint unifm_offset_x;
  /// Location of uniform "offset_y" in blur GLSL program.
  GLint unifm_offset_y;
  /// Location of uniform "factor_center" in blur GLSL program.
  GLint unifm_factor_center;
} glx_blur_pass_t;

typedef struct {
  /// Framebuffer used for blurring.
  GLuint fbo;
  /// Textures used for blurring.
  GLuint textures[2];
  /// Width of the textures.
  int width;
  /// Height of the textures.
  int height;
} glx_blur_cache_t;
#endif

typedef struct {
  Pixmap pixmap;
  Picture pict;
  glx_texture_t *ptex;
} paint_t;

#define PAINT_INIT { .pixmap = None, .pict = None }

typedef struct {
  int size;
  double *data;
} conv;

/// Linked list type of atoms.
typedef struct _latom {
  Atom atom;
  struct _latom *next;
} latom_t;

/// A representation of raw region data
typedef struct {
  XRectangle *rects;
  int nrects;
} reg_data_t;

#define REG_DATA_INIT { NULL, 0 }

struct _timeout_t;

struct _win;

typedef struct _c2_lptr c2_lptr_t;

/// Structure representing all options.
typedef struct _options_t {
  // === General ===
  /// The configuration file we used.
  char *config_file;
  /// Path to write PID to.
  char *write_pid_path;
  /// The display name we used. NULL means we are using the value of the
  /// <code>DISPLAY</code> environment variable.
  char *display;
  /// Safe representation of display name.
  char *display_repr;
  /// The backend in use.
  enum backend backend;
  /// Whether to sync X drawing to avoid certain delay issues with
  /// GLX backend.
  bool xrender_sync;
  /// Whether to sync X drawing with X Sync fence.
  bool xrender_sync_fence;
  /// Whether to avoid using stencil buffer under GLX backend. Might be
  /// unsafe.
  bool glx_no_stencil;
  /// Whether to copy unmodified regions from front buffer.
  bool glx_copy_from_front;
  /// Whether to use glXCopySubBufferMESA() to update screen.
  bool glx_use_copysubbuffermesa;
  /// Whether to avoid rebinding pixmap on window damage.
  bool glx_no_rebind_pixmap;
  /// GLX swap method we assume OpenGL uses.
  int glx_swap_method;
  /// Whether to use GL_EXT_gpu_shader4 to (hopefully) accelerates blurring.
  bool glx_use_gpushader4;
  /// Whether to try to detect WM windows and mark them as focused.
  bool mark_wmwin_focused;
  /// Whether to mark override-redirect windows as focused.
  bool mark_ovredir_focused;
  /// Whether to fork to background.
  bool fork_after_register;
  /// Whether to detect rounded corners.
  bool detect_rounded_corners;
  /// Whether to paint on X Composite overlay window instead of root
  /// window.
  bool paint_on_overlay;
  /// Resize damage for a specific number of pixels.
  int resize_damage;
  /// Whether to unredirect all windows if a full-screen opaque window
  /// is detected.
  bool unredir_if_possible;
  /// List of conditions of windows to ignore as a full-screen window
  /// when determining if a window could be unredirected.
  c2_lptr_t *unredir_if_possible_blacklist;
  /// Delay before unredirecting screen.
  time_ms_t unredir_if_possible_delay;
  /// Forced redirection setting through D-Bus.
  switch_t redirected_force;
  /// Whether to stop painting. Controlled through D-Bus.
  switch_t stoppaint_force;
  /// Whether to enable D-Bus support.
  bool dbus;
  /// Path to log file.
  char *logpath;
  /// Number of cycles to paint in benchmark mode. 0 for disabled.
  int benchmark;
  /// Window to constantly repaint in benchmark mode. 0 for full-screen.
  Window benchmark_wid;
  /// A list of conditions of windows not to paint.
  c2_lptr_t *paint_blacklist;
  /// Whether to work under synchronized mode for debugging.
  bool synchronize;

  // === VSync & software optimization ===
  /// User-specified refresh rate.
  int refresh_rate;
  /// Whether to enable refresh-rate-based software optimization.
  bool sw_opti;
  /// VSync method to use;
  vsync_t vsync;
  /// Whether to enable double buffer.
  bool dbe;
  /// Whether to do VSync aggressively.
  bool vsync_aggressive;
  /// Whether to use glFinish() instead of glFlush() for (possibly) better
  /// VSync yet probably higher CPU usage.
  bool vsync_use_glfinish;

  // === Shadow ===
  /// Enable/disable shadow for specific window types.
  bool wintype_shadow[NUM_WINTYPES];
  /// Red, green and blue tone of the shadow.
  double shadow_red, shadow_green, shadow_blue;
  int shadow_radius;
  int shadow_offset_x, shadow_offset_y;
  double shadow_opacity;
  bool clear_shadow;
  /// Geometry of a region in which shadow is not painted on.
  geometry_t shadow_exclude_reg_geom;
  /// Shadow blacklist. A linked list of conditions.
  c2_lptr_t *shadow_blacklist;
  /// Whether bounding-shaped window should be ignored.
  bool shadow_ignore_shaped;
  /// Whether to respect _TDE_WM_WINDOW_SHADOW.
  bool respect_prop_shadow;
  /// Whether to crop shadow to the very Xinerama screen.
  bool xinerama_shadow_crop;

  // === Fading ===
  /// Enable/disable fading for specific window types.
  bool wintype_fade[NUM_WINTYPES];
  /// How much to fade in in a single fading step.
  opacity_t fade_in_step;
  /// How much to fade out in a single fading step.
  opacity_t fade_out_step;
  /// Fading time delta. In milliseconds.
  time_ms_t fade_delta;
  /// Whether to disable fading on window open/close.
  bool no_fading_openclose;
  /// Whether to disable fading on opacity change
  bool no_fading_opacitychange;
  /// Fading blacklist. A linked list of conditions.
  c2_lptr_t *fade_blacklist;

  // === Opacity ===
  /// Default opacity for specific window types
  double wintype_opacity[NUM_WINTYPES];
  /// Default opacity for inactive windows.
  /// 32-bit integer with the format of _NET_WM_OPACITY. 0 stands for
  /// not enabled, default.
  opacity_t inactive_opacity;
  /// Default opacity for inactive windows.
  opacity_t active_opacity;
  /// Whether inactive_opacity overrides the opacity set by window
  /// attributes.
  bool inactive_opacity_override;
  /// Frame opacity. Relative to window opacity, also affects shadow
  /// opacity.
  double frame_opacity;
  /// Whether to detect _NET_WM_OPACITY on client windows. Used on window
  /// managers that don't pass _NET_WM_OPACITY to frame windows.
  bool detect_client_opacity;
  /// Step for pregenerating alpha pictures. 0.01 - 1.0.
  double alpha_step;

  // === Other window processing ===
  /// Whether to blur background of semi-transparent / ARGB windows.
  bool blur_background;
  /// Whether to blur background when the window frame is not opaque.
  /// Implies blur_background.
  bool blur_background_frame;
  /// Whether to use fixed blur strength instead of adjusting according
  /// to window opacity.
  bool blur_background_fixed;
  /// Background blur blacklist. A linked list of conditions.
  c2_lptr_t *blur_background_blacklist;
  /// Blur convolution kernel.
  XFixed *blur_kerns[MAX_BLUR_PASS];
  /// How much to dim an inactive window. 0.0 - 1.0, 0 to disable.
  double inactive_dim;
  /// Whether to use fixed inactive dim opacity, instead of deciding
  /// based on window opacity.
  bool inactive_dim_fixed;
  /// Conditions of windows to have inverted colors.
  c2_lptr_t *invert_color_list;
  /// Rules to change window opacity.
  c2_lptr_t *opacity_rules;

  // === Focus related ===
  /// Consider windows of specific types to be always focused.
  bool wintype_focus[NUM_WINTYPES];
  /// Whether to use EWMH _NET_ACTIVE_WINDOW to find active window.
  bool use_ewmh_active_win;
  /// A list of windows always to be considered focused.
  c2_lptr_t *focus_blacklist;
  /// Whether to do window grouping with <code>WM_TRANSIENT_FOR</code>.
  bool detect_transient;
  /// Whether to do window grouping with <code>WM_CLIENT_LEADER</code>.
  bool detect_client_leader;

  // === Calculated ===
  /// Whether compton needs to track focus changes.
  bool track_focus;
  /// Whether compton needs to track window name and class.
  bool track_wdata;
  /// Whether compton needs to track window leaders.
  bool track_leader;
} options_t;

/// Structure containing all necessary data for a compton session.
typedef struct _session_t {
  // === Display related ===
  /// Display in use.
  Display *dpy;
  /// Default screen.
  int scr;
  /// Default visual.
  Visual *vis;
  /// Default depth.
  int depth;
  /// Root window.
  Window root;
  /// Height of root window.
  int root_height;
  /// Width of root window.
  int root_width;
  // Damage of root window.
  // Damage root_damage;
  /// X Composite overlay window. Used if <code>--paint-on-overlay</code>.
  Window overlay;
  /// Whether the root tile is filled by compton.
  bool root_tile_fill;
  /// Picture of the root window background.
  paint_t root_tile_paint;
  /// A region of the size of the screen.
  XserverRegion screen_reg;
  /// Picture of root window. Destination of painting in no-DBE painting
  /// mode.
  Picture root_picture;
  /// A Picture acting as the painting target.
  Picture tgt_picture;
  /// Temporary buffer to paint to before sending to display.
  paint_t tgt_buffer;
#ifdef CONFIG_XSYNC
  XSyncFence tgt_buffer_fence;
#endif
  /// DBE back buffer for root window. Used in DBE painting mode.
  XdbeBackBuffer root_dbe;
  /// Window ID of the window we register as a symbol.
  Window reg_win;

  // === Operation related ===
  /// Program options.
  options_t o;
  /// File descriptors to check for reading.
  fd_set *pfds_read;
  /// File descriptors to check for writing.
  fd_set *pfds_write;
  /// File descriptors to check for exceptions.
  fd_set *pfds_except;
  /// Largest file descriptor in fd_set-s above.
  int nfds_max;
  /// Linked list of all timeouts.
  struct _timeout_t *tmout_lst;
  /// Timeout for delayed unredirection.
  struct _timeout_t *tmout_unredir;
  /// Whether we have hit unredirection timeout.
  bool tmout_unredir_hit;
  /// Whether we have received an event in this cycle.
  bool ev_received;
  /// Whether the program is idling. I.e. no fading, no potential window
  /// changes.
  bool idling;
  /// Program start time.
  struct timeval time_start;
  /// The region needs to painted on next paint.
  XserverRegion all_damage;
  /// The region damaged on the last paint.
  XserverRegion all_damage_last[CGLX_MAX_BUFFER_AGE];
  /// Whether all windows are currently redirected.
  bool redirected;
  /// Pre-generated alpha pictures.
  Picture *alpha_picts;
  /// Whether all reg_ignore of windows should expire in this paint.
  bool reg_ignore_expire;
  /// Time of last fading. In milliseconds.
  time_ms_t fade_time;
  /// Head pointer of the error ignore linked list.
  ignore_t *ignore_head;
  /// Pointer to the <code>next</code> member of tail element of the error
  /// ignore linked list.
  ignore_t **ignore_tail;
#ifdef CONFIG_VSYNC_OPENGL
  /// Current GLX Z value.
  int glx_z;
#endif
  // Cached blur convolution kernels.
  XFixed *blur_kerns_cache[MAX_BLUR_PASS];
  /// Reset program after next paint.
  bool reset;

  // === Expose event related ===
  /// Pointer to an array of <code>XRectangle</code>-s of exposed region.
  XRectangle *expose_rects;
  /// Number of <code>XRectangle</code>-s in <code>expose_rects</code>.
  int size_expose;
  /// Index of the next free slot in <code>expose_rects</code>.
  int n_expose;

  // === Window related ===
  /// Linked list of all windows.
  struct _win *list;
  /// Pointer to <code>win</code> of current active window. Used by
  /// EWMH <code>_NET_ACTIVE_WINDOW</code> focus detection. In theory,
  /// it's more reliable to store the window ID directly here, just in
  /// case the WM does something extraordinary, but caching the pointer
  /// means another layer of complexity.
  struct _win *active_win;
  /// Window ID of leader window of currently active window. Used for
  /// subsidiary window detection.
  Window active_leader;

  // === Shadow/dimming related ===
  /// 1x1 black Picture.
  Picture black_picture;
  /// 1x1 Picture of the shadow color.
  Picture cshadow_picture;
  /// 1x1 white Picture.
  Picture white_picture;
  /// Gaussian map of shadow.
  conv *gaussian_map;
  // for shadow precomputation
  /// Shadow depth on one side.
  int cgsize;
  /// Pre-computed color table for corners of shadow.
  unsigned char *shadow_corner;
  /// Pre-computed color table for a side of shadow.
  unsigned char *shadow_top;
  /// A region in which shadow is not painted on.
  XserverRegion shadow_exclude_reg;

  // === Software-optimization-related ===
  /// Currently used refresh rate.
  short refresh_rate;
  /// Interval between refresh in nanoseconds.
  long refresh_intv;
  /// Nanosecond offset of the first painting.
  long paint_tm_offset;

#ifdef CONFIG_VSYNC_DRM
  // === DRM VSync related ===
  /// File descriptor of DRI device file. Used for DRM VSync.
  int drm_fd;
#endif

#ifdef CONFIG_VSYNC_OPENGL
  // === OpenGL related ===
  /// GLX context.
  GLXContext glx_context;
  /// Whether we have GL_ARB_texture_non_power_of_two.
  bool glx_has_texture_non_power_of_two;
  /// Pointer to glXGetVideoSyncSGI function.
  f_GetVideoSync glXGetVideoSyncSGI;
  /// Pointer to glXWaitVideoSyncSGI function.
  f_WaitVideoSync glXWaitVideoSyncSGI;
   /// Pointer to glXGetSyncValuesOML function.
  f_GetSyncValuesOML glXGetSyncValuesOML;
  /// Pointer to glXWaitForMscOML function.
  f_WaitForMscOML glXWaitForMscOML;
  /// Pointer to glXSwapIntervalSGI function.
  f_SwapIntervalSGI glXSwapIntervalProc;
  /// Pointer to glXSwapIntervalMESA function.
  f_SwapIntervalMESA glXSwapIntervalMESAProc;
  /// Pointer to glXBindTexImageEXT function.
  f_BindTexImageEXT glXBindTexImageProc;
  /// Pointer to glXReleaseTexImageEXT function.
  f_ReleaseTexImageEXT glXReleaseTexImageProc;
  /// Pointer to glXCopySubBufferMESA function.
  f_CopySubBuffer glXCopySubBufferProc;
#ifdef CONFIG_GLX_SYNC
  /// Pointer to the glFenceSync() function.
  f_FenceSync glFenceSyncProc;
  /// Pointer to the glIsSync() function.
  f_IsSync glIsSyncProc;
  /// Pointer to the glDeleteSync() function.
  f_DeleteSync glDeleteSyncProc;
  /// Pointer to the glClientWaitSync() function.
  f_ClientWaitSync glClientWaitSyncProc;
  /// Pointer to the glWaitSync() function.
  f_WaitSync glWaitSyncProc;
  /// Pointer to the glImportSyncEXT() function.
  f_ImportSyncEXT glImportSyncEXT;
#endif
#ifdef DEBUG_GLX_MARK
  /// Pointer to StringMarkerGREMEDY function.
  f_StringMarkerGREMEDY glStringMarkerGREMEDY;
  /// Pointer to FrameTerminatorGREMEDY function.
  f_FrameTerminatorGREMEDY glFrameTerminatorGREMEDY;
#endif
  /// FBConfig-s for GLX pixmap of different depths.
  glx_fbconfig_t *glx_fbconfigs[OPENGL_MAX_DEPTH + 1];
#ifdef CONFIG_VSYNC_OPENGL_GLSL
  glx_blur_pass_t glx_blur_passes[MAX_BLUR_PASS];
#endif
#endif

  // === X extension related ===
  /// Event base number for X Fixes extension.
  int xfixes_event;
  /// Error base number for X Fixes extension.
  int xfixes_error;
  /// Event base number for X Damage extension.
  int damage_event;
  /// Error base number for X Damage extension.
  int damage_error;
  /// Event base number for X Render extension.
  int render_event;
  /// Error base number for X Render extension.
  int render_error;
  /// Event base number for X Composite extension.
  int composite_event;
  /// Error base number for X Composite extension.
  int composite_error;
  /// Major opcode for X Composite extension.
  int composite_opcode;
  /// Whether X Composite NameWindowPixmap is available. Aka if X
  /// Composite version >= 0.2.
  bool has_name_pixmap;
  /// Whether X Shape extension exists.
  bool shape_exists;
  /// Event base number for X Shape extension.
  int shape_event;
  /// Error base number for X Shape extension.
  int shape_error;
#ifdef CONFIG_XRANDR
  /// Whether X RandR extension exists.
  bool randr_exists;
  /// Event base number for X RandR extension.
  int randr_event;
  /// Error base number for X RandR extension.
  int randr_error;
#endif // CONFIG_XRANDR
#ifdef CONFIG_VSYNC_OPENGL
  /// Whether X GLX extension exists.
  bool glx_exists;
  /// Event base number for X GLX extension.
  int glx_event;
  /// Error base number for X GLX extension.
  int glx_error;
#endif
  /// Whether X DBE extension exists.
  bool dbe_exists;
#ifdef CONFIG_XINERAMA
  /// Whether X Xinerama extension exists.
  bool xinerama_exists;
  /// Xinerama screen info.
  XineramaScreenInfo *xinerama_scrs;
  /// Xinerama screen regions.
  XserverRegion *xinerama_scr_regs;
  /// Number of Xinerama screens.
  int xinerama_nscrs;
#endif
#ifdef CONFIG_XSYNC
  /// Whether X Sync extension exists.
  bool xsync_exists;
  /// Event base number for X Sync extension.
  int xsync_event;
  /// Error base number for X Sync extension.
  int xsync_error;
#endif
  /// Whether X Render convolution filter exists.
  bool xrfilter_convolution_exists;

  // === Atoms ===
  /// Atom of property <code>_NET_WM_OPACITY</code>.
  Atom atom_opacity;
  /// Atom of <code>_NET_FRAME_EXTENTS</code>.
  Atom atom_frame_extents;
  /// Property atom to identify top-level frame window. Currently
  /// <code>WM_STATE</code>.
  Atom atom_client;
  /// Atom of property <code>WM_NAME</code>.
  Atom atom_name;
  /// Atom of property <code>_NET_WM_NAME</code>.
  Atom atom_name_ewmh;
  /// Atom of property <code>WM_CLASS</code>.
  Atom atom_class;
  /// Atom of property <code>WM_WINDOW_ROLE</code>.
  Atom atom_role;
  /// Atom of property <code>WM_TRANSIENT_FOR</code>.
  Atom atom_transient;
  /// Atom of property <code>WM_CLIENT_LEADER</code>.
  Atom atom_client_leader;
  /// Atom of property <code>_NET_ACTIVE_WINDOW</code>.
  Atom atom_ewmh_active_win;
  /// Atom of property <code>_TDE_WM_WINDOW_SHADOW</code>.
  Atom atom_compton_shadow;
  /// Atom of property <code>_NET_WM_WINDOW_TYPE</code>.
  Atom atom_win_type;
  /// Atom of property <code>_KDE_TRANSPARENT_TO_BLACK</code>.
  Atom atom_win_type_tde_transparent_to_black;
  /// Atom of property <code>_KDE_TRANSPARENT_TO_DESKTOP</code>.
  Atom atom_win_type_tde_transparent_to_desktop;
  /// Array of atoms of all possible window types.
  Atom atoms_wintypes[NUM_WINTYPES];
  /// Linked list of additional atoms to track.
  latom_t *track_atom_lst;

#ifdef CONFIG_DBUS
  // === DBus related ===
  // DBus connection.
  DBusConnection *dbus_conn;
  // DBus service name.
  char *dbus_service;
#endif
} session_t;

/// Structure representing a top-level window compton manages.
typedef struct _win {
  /// Pointer to the next structure in the linked list.
  struct _win *next;
  /// Pointer to the next higher window to paint.
  struct _win *prev_trans;

  // Core members
  /// ID of the top-level frame window.
  Window id;
  /// Window attributes.
  XWindowAttributes a;
#ifdef CONFIG_XINERAMA
  /// Xinerama screen this window is on.
  int xinerama_scr;
#endif
  /// Window visual pict format;
  XRenderPictFormat *pictfmt;
  /// Window painting mode.
  winmode_t mode;
  /// Whether the window has been damaged at least once.
  bool damaged;
#ifdef CONFIG_XSYNC
  /// X Sync fence of drawable.
  XSyncFence fence;
#endif
  /// Whether the window was damaged after last paint.
  bool pixmap_damaged;
  /// Damage of the window.
  Damage damage;
  /// Paint info of the window.
  paint_t paint;
  /// Bounding shape of the window.
  XserverRegion border_size;
  /// Region of the whole window, shadow region included.
  XserverRegion extents;
  /// Window flags. Definitions above.
  int_fast16_t flags;
  /// Whether there's a pending <code>ConfigureNotify</code> happening
  /// when the window is unmapped.
  bool need_configure;
  /// Queued <code>ConfigureNotify</code> when the window is unmapped.
  XConfigureEvent queue_configure;
  /// Region to be ignored when painting. Basically the region where
  /// higher opaque windows will paint upon. Depends on window frame
  /// opacity state, window geometry, window mapped/unmapped state,
  /// window mode, of this and all higher windows.
  XserverRegion reg_ignore;
  /// Cached width/height of the window including border.
  int widthb, heightb;
  /// Whether the window has been destroyed.
  bool destroyed;
  /// Whether the window is bounding-shaped.
  bool bounding_shaped;
  /// Whether the window just have rounded corners.
  bool rounded_corners;
  /// Whether this window is to be painted.
  bool to_paint;
  /// Whether the window is painting excluded.
  bool paint_excluded;
  /// Whether the window is unredirect-if-possible excluded.
  bool unredir_if_possible_excluded;
  /// Whether this window is in open/close state.
  bool in_openclose;

  // Client window related members
  /// ID of the top-level client window of the window.
  Window client_win;
  /// Type of the window.
  wintype_t window_type;
  /// Whether it looks like a WM window. We consider a window WM window if
  /// it does not have a decedent with WM_STATE and it is not override-
  /// redirected itself.
  bool wmwin;
  /// Leader window ID of the window.
  Window leader;
  /// Cached topmost window ID of the window.
  Window cache_leader;

  // Focus-related members
  /// Whether the window is to be considered focused.
  bool focused;
  /// Override value of window focus state. Set by D-Bus method calls.
  switch_t focused_force;

  // Blacklist related members
  /// Name of the window.
  char *name;
  /// Window instance class of the window.
  char *class_instance;
  /// Window general class of the window.
  char *class_general;
  /// <code>WM_WINDOW_ROLE</code> value of the window.
  char *role;
  const c2_lptr_t *cache_sblst;
  const c2_lptr_t *cache_fblst;
  const c2_lptr_t *cache_fcblst;
  const c2_lptr_t *cache_ivclst;
  const c2_lptr_t *cache_bbblst;
  const c2_lptr_t *cache_oparule;
  const c2_lptr_t *cache_pblst;
  const c2_lptr_t *cache_uipblst;

  // Opacity-related members
  /// Current window opacity.
  opacity_t opacity;
  /// Target window opacity.
  opacity_t opacity_tgt;
  /// Cached value of opacity window attribute.
  opacity_t opacity_prop;
  /// Cached value of opacity window attribute on client window. For
  /// broken window managers not transferring client window's
  /// _NET_WM_OPACITY value
  opacity_t opacity_prop_client;
  /// Last window opacity value we set.
  opacity_t opacity_set;

  // Fading-related members
  /// Do not fade if it's false. Change on window type change.
  /// Used by fading blacklist in the future.
  bool fade;
  /// Override value of window fade state. Set by D-Bus method calls.
  switch_t fade_force;
  /// Callback to be called after fading completed.
  void (*fade_callback) (session_t *ps, struct _win *w);

  // Frame-opacity-related members
  /// Current window frame opacity. Affected by window opacity.
  double frame_opacity;
  /// Frame widths. Determined by client window attributes.
  unsigned int left_width, right_width, top_width, bottom_width;

  // Shadow-related members
  /// Whether a window has shadow. Calculated.
  bool shadow;
  /// Override value of window shadow state. Set by D-Bus method calls.
  switch_t shadow_force;
  /// Opacity of the shadow. Affected by window opacity and frame opacity.
  double shadow_opacity;
  /// X offset of shadow. Affected by commandline argument.
  int shadow_dx;
  /// Y offset of shadow. Affected by commandline argument.
  int shadow_dy;
  /// Width of shadow. Affected by window size and commandline argument.
  int shadow_width;
  /// Height of shadow. Affected by window size and commandline argument.
  int shadow_height;
  /// Relative size of shadow.
  int shadow_size;
  /// Picture to render shadow. Affected by window size.
  paint_t shadow_paint;
  /// The value of _TDE_WM_WINDOW_SHADOW attribute of the window. Below 0 for
  /// none.
  long prop_shadow;

  // Dim-related members
  /// Whether the window is to be dimmed.
  bool dim;

  /// Whether to invert window color.
  bool invert_color;
  /// Override value of window color inversion state. Set by D-Bus method
  /// calls.
  switch_t invert_color_force;

  /// Whether to blur window background.
  bool blur_background;

  /// Whether to show black background
  bool show_black_background;

  /// Whether to show desktop background
  bool show_root_tile;

#ifdef CONFIG_VSYNC_OPENGL_GLSL
  /// Textures and FBO background blur use.
  glx_blur_cache_t glx_blur_cache;
#endif
} win;

/// Temporary structure used for communication between
/// <code>get_cfg()</code> and <code>parse_config()</code>.
struct options_tmp {
  bool no_dock_shadow;
  bool no_dnd_shadow;
  double menu_opacity;
};

/// Structure for a recorded timeout.
typedef struct _timeout_t {
  bool enabled;
  void *data;
  bool (*callback)(session_t *ps, struct _timeout_t *ptmout);
  time_ms_t interval;
  time_ms_t firstrun;
  time_ms_t lastrun;
  struct _timeout_t *next;
} timeout_t;

/// Enumeration for window event hints.
typedef enum {
  WIN_EVMODE_UNKNOWN,
  WIN_EVMODE_FRAME,
  WIN_EVMODE_CLIENT
} win_evmode_t;

extern const char * const WINTYPES[NUM_WINTYPES];
extern const char * const VSYNC_STRS[NUM_VSYNC + 1];
extern const char * const BACKEND_STRS[NUM_BKEND + 1];
extern session_t *ps_g;

// == Debugging code ==
static inline void
print_timestamp(session_t *ps);

#ifdef DEBUG_ALLOC_REG

#include <execinfo.h>
#define BACKTRACE_SIZE  5

/**
 * Print current backtrace, excluding the first two items.
 *
 * Stolen from glibc manual.
 */
static inline void
print_backtrace(void) {
  void *array[BACKTRACE_SIZE];
  size_t size;
  char **strings;

  size = backtrace(array, BACKTRACE_SIZE);
  strings = backtrace_symbols(array, size);

  for (size_t i = 2; i < size; i++)
     printf ("%s\n", strings[i]);

  free(strings);
}

/**
 * Wrapper of <code>XFixesCreateRegion</code>, for debugging.
 */
static inline XserverRegion
XFixesCreateRegion_(Display *dpy, XRectangle *p, int n,
    const char *func, int line) {
  XserverRegion reg = XFixesCreateRegion(dpy, p, n);
  print_timestamp(ps_g);
  printf("%#010lx: XFixesCreateRegion() in %s():%d\n", reg, func, line);
  print_backtrace();
  fflush(stdout);
  return reg;
}

/**
 * Wrapper of <code>XFixesDestroyRegion</code>, for debugging.
 */
static inline void
XFixesDestroyRegion_(Display *dpy, XserverRegion reg,
    const char *func, int line) {
  XFixesDestroyRegion(dpy, reg);
  print_timestamp(ps_g);
  printf("%#010lx: XFixesDestroyRegion() in %s():%d\n", reg, func, line);
  fflush(stdout);
}

#define XFixesCreateRegion(dpy, p, n) XFixesCreateRegion_(dpy, p, n, __func__, __LINE__)
#define XFixesDestroyRegion(dpy, reg) XFixesDestroyRegion_(dpy, reg, __func__, __LINE__)
#endif

// === Functions ===

/**
 * @brief Quit if the passed-in pointer is empty.
 */
static inline void *
allocchk_(const char *func_name, void *ptr) {
  if (!ptr) {
    printf_err("%s(): Failed to allocate memory.", func_name);
    exit(1);
  }
  return ptr;
}

/// @brief Wrapper of allocchk_().
#define allocchk(ptr) allocchk_(__func__, ptr)

/// @brief Wrapper of malloc().
#define cmalloc(nmemb, type) ((type *) allocchk(malloc((nmemb) * sizeof(type))))

/// @brief Wrapper of calloc().
#define ccalloc(nmemb, type) ((type *) allocchk(calloc((nmemb), sizeof(type))))

/// @brief Wrapper of ealloc().
#define crealloc(ptr, nmemb, type) ((type *) allocchk(realloc((ptr), (nmemb) * sizeof(type))))

/**
 * Return whether a struct timeval value is empty.
 */
static inline bool
timeval_isempty(struct timeval *ptv) {
  if (!ptv)
    return false;

  return ptv->tv_sec <= 0 && ptv->tv_usec <= 0;
}

/**
 * Compare a struct timeval with a time in milliseconds.
 *
 * @return > 0 if ptv > ms, 0 if ptv == 0, -1 if ptv < ms
 */
static inline int
timeval_ms_cmp(struct timeval *ptv, time_ms_t ms) {
  assert(ptv);

  // We use those if statement instead of a - expression because of possible
  // truncation problem from long to int.
  {
    long sec = ms / MS_PER_SEC;
    if (ptv->tv_sec > sec)
      return 1;
    if (ptv->tv_sec < sec)
      return -1;
  }

  {
    long usec = ms % MS_PER_SEC * (US_PER_SEC / MS_PER_SEC);
    if (ptv->tv_usec > usec)
      return 1;
    if (ptv->tv_usec < usec)
      return -1;
  }

  return 0;
}

/**
 * Subtracting two struct timeval values.
 *
 * Taken from glibc manual.
 *
 * Subtract the `struct timeval' values X and Y,
 * storing the result in RESULT.
 * Return 1 if the difference is negative, otherwise 0.
 */
static inline int
timeval_subtract(struct timeval *result,
                 struct timeval *x,
                 struct timeval *y) {
  /* Perform the carry for the later subtraction by updating y. */
  if (x->tv_usec < y->tv_usec) {
    long nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
    y->tv_usec -= 1000000 * nsec;
    y->tv_sec += nsec;
  }

  if (x->tv_usec - y->tv_usec > 1000000) {
    long nsec = (x->tv_usec - y->tv_usec) / 1000000;
    y->tv_usec += 1000000 * nsec;
    y->tv_sec -= nsec;
  }

  /* Compute the time remaining to wait.
     tv_usec is certainly positive. */
  result->tv_sec = x->tv_sec - y->tv_sec;
  result->tv_usec = x->tv_usec - y->tv_usec;

  /* Return 1 if result is negative. */
  return x->tv_sec < y->tv_sec;
}

/**
 * Subtracting two struct timespec values.
 *
 * Taken from glibc manual.
 *
 * Subtract the `struct timespec' values X and Y,
 * storing the result in RESULT.
 * Return 1 if the difference is negative, otherwise 0.
 */
static inline int
timespec_subtract(struct timespec *result,
                 struct timespec *x,
                 struct timespec *y) {
  /* Perform the carry for the later subtraction by updating y. */
  if (x->tv_nsec < y->tv_nsec) {
    long nsec = (y->tv_nsec - x->tv_nsec) / NS_PER_SEC + 1;
    y->tv_nsec -= NS_PER_SEC * nsec;
    y->tv_sec += nsec;
  }

  if (x->tv_nsec - y->tv_nsec > NS_PER_SEC) {
    long nsec = (x->tv_nsec - y->tv_nsec) / NS_PER_SEC;
    y->tv_nsec += NS_PER_SEC * nsec;
    y->tv_sec -= nsec;
  }

  /* Compute the time remaining to wait.
     tv_nsec is certainly positive. */
  result->tv_sec = x->tv_sec - y->tv_sec;
  result->tv_nsec = x->tv_nsec - y->tv_nsec;

  /* Return 1 if result is negative. */
  return x->tv_sec < y->tv_sec;
}

/**
 * Get current time in struct timeval.
 */
static inline struct timeval __attribute__((const))
get_time_timeval(void) {
  struct timeval tv = { 0, 0 };

  gettimeofday(&tv, NULL);

  // Return a time of all 0 if the call fails
  return tv;
}

/**
 * Get current time in struct timespec.
 *
 * Note its starting time is unspecified.
 */
static inline struct timespec __attribute__((const))
get_time_timespec(void) {
  struct timespec tm = { 0, 0 };

  clock_gettime(CLOCK_MONOTONIC, &tm);

  // Return a time of all 0 if the call fails
  return tm;
}


/**
 * Print time passed since program starts execution.
 *
 * Used for debugging.
 */
static inline void
print_timestamp(session_t *ps) {
  struct timeval tm, diff;

  if (gettimeofday(&tm, NULL)) return;

  timeval_subtract(&diff, &tm, &ps->time_start);
  printf("[ %5ld.%02ld ] ", diff.tv_sec, diff.tv_usec / 10000);
}

/**
 * Allocate the space and copy a string.
 */
static inline char *
mstrcpy(const char *src) {
  char *str = cmalloc(strlen(src) + 1, char);

  strcpy(str, src);

  return str;
}

/**
 * Allocate the space and copy a string.
 */
static inline char *
mstrncpy(const char *src, unsigned len) {
  char *str = cmalloc(len + 1, char);

  strncpy(str, src, len);
  str[len] = '\0';

  return str;
}

/**
 * Allocate the space and join two strings.
 */
static inline char *
mstrjoin(const char *src1, const char *src2) {
  char *str = cmalloc(strlen(src1) + strlen(src2) + 1, char);

  strcpy(str, src1);
  strcat(str, src2);

  return str;
}

/**
 * Allocate the space and join two strings;
 */
static inline char *
mstrjoin3(const char *src1, const char *src2, const char *src3) {
  char *str = cmalloc(strlen(src1) + strlen(src2)
        + strlen(src3) + 1, char);

  strcpy(str, src1);
  strcat(str, src2);
  strcat(str, src3);

  return str;
}

/**
 * Concatenate a string on heap with another string.
 */
static inline void
mstrextend(char **psrc1, const char *src2) {
  *psrc1 = crealloc(*psrc1, (*psrc1 ? strlen(*psrc1): 0) + strlen(src2) + 1,
      char);

  strcat(*psrc1, src2);
}

/**
 * Normalize an int value to a specific range.
 *
 * @param i int value to normalize
 * @param min minimal value
 * @param max maximum value
 * @return normalized value
 */
static inline int __attribute__((const))
normalize_i_range(int i, int min, int max) {
  if (i > max) return max;
  if (i < min) return min;
  return i;
}

/**
 * Select the larger integer of two.
 */
static inline int __attribute__((const))
max_i(int a, int b) {
  return (a > b ? a : b);
}

/**
 * Select the smaller integer of two.
 */
static inline int __attribute__((const))
min_i(int a, int b) {
  return (a > b ? b : a);
}

/**
 * Select the larger long integer of two.
 */
static inline long __attribute__((const))
max_l(long a, long b) {
  return (a > b ? a : b);
}

/**
 * Select the smaller long integer of two.
 */
static inline long __attribute__((const))
min_l(long a, long b) {
  return (a > b ? b : a);
}

/**
 * Normalize a double value to a specific range.
 *
 * @param d double value to normalize
 * @param min minimal value
 * @param max maximum value
 * @return normalized value
 */
static inline double __attribute__((const))
normalize_d_range(double d, double min, double max) {
  if (d > max) return max;
  if (d < min) return min;
  return d;
}

/**
 * Normalize a double value to 0.\ 0 - 1.\ 0.
 *
 * @param d double value to normalize
 * @return normalized value
 */
static inline double __attribute__((const))
normalize_d(double d) {
  return normalize_d_range(d, 0.0, 1.0);
}

/**
 * Parse a VSync option argument.
 */
static inline bool
parse_vsync(session_t *ps, const char *str) {
  for (vsync_t i = 0; VSYNC_STRS[i]; ++i)
    if (!strcasecmp(str, VSYNC_STRS[i])) {
      ps->o.vsync = i;
      return true;
    }

  printf_errf("(\"%s\"): Invalid vsync argument.", str);
  return false;
}

/**
 * Parse a backend option argument.
 */
static inline bool
parse_backend(session_t *ps, const char *str) {
  for (enum backend i = 0; BACKEND_STRS[i]; ++i)
    if (!strcasecmp(str, BACKEND_STRS[i])) {
      ps->o.backend = i;
      return true;
    }
  // Keep compatibility with an old revision containing a spelling mistake...
  if (!strcasecmp(str, "xr_glx_hybird")) {
    ps->o.backend = BKEND_XR_GLX_HYBRID;
    return true;
  }
  // cju wants to use dashes
  if (!strcasecmp(str, "xr-glx-hybrid")) {
    ps->o.backend = BKEND_XR_GLX_HYBRID;
    return true;
  }
  printf_errf("(\"%s\"): Invalid backend argument.", str);
  return false;
}

/**
 * Parse a glx_swap_method option argument.
 */
static inline bool
parse_glx_swap_method(session_t *ps, const char *str) {
  // Parse alias
  if (!strcmp("undefined", str)) {
    ps->o.glx_swap_method = 0;
    return true;
  }

  if (!strcmp("copy", str)) {
    ps->o.glx_swap_method = 1;
    return true;
  }

  if (!strcmp("exchange", str)) {
    ps->o.glx_swap_method = 2;
    return true;
  }

  if (!strcmp("buffer-age", str)) {
    ps->o.glx_swap_method = -1;
    return true;
  }

  // Parse number
  {
    char *pc = NULL;
    int age = strtol(str, &pc, 0);
    if (!pc || str == pc) {
      printf_errf("(\"%s\"): Invalid number.", str);
      return false;
    }

    for (; *pc; ++pc)
      if (!isspace(*pc)) {
        printf_errf("(\"%s\"): Trailing characters.", str);
        return false;
      }

    if (age > CGLX_MAX_BUFFER_AGE + 1 || age < -1) {
      printf_errf("(\"%s\"): Number too large / too small.", str);
      return false;
    }

    ps->o.glx_swap_method = age;
  }

  return true;
}

timeout_t *
timeout_insert(session_t *ps, time_ms_t interval,
    bool (*callback)(session_t *ps, timeout_t *ptmout), void *data);

void
timeout_invoke(session_t *ps, timeout_t *ptmout);

bool
timeout_drop(session_t *ps, timeout_t *prm);

void
timeout_reset(session_t *ps, timeout_t *ptmout);

/**
 * Add a file descriptor to a select() fd_set.
 */
static inline bool
fds_insert_select(fd_set **ppfds, int fd) {
  assert(fd <= FD_SETSIZE);

  if (!*ppfds) {
    if ((*ppfds = malloc(sizeof(fd_set)))) {
      FD_ZERO(*ppfds);
    }
    else {
      fprintf(stderr, "Failed to allocate memory for select() fdset.\n");
      exit(1);
    }
  }

  FD_SET(fd, *ppfds);

  return true;
}

/**
 * Add a new file descriptor to wait for.
 */
static inline bool
fds_insert(session_t *ps, int fd, short events) {
  bool result = true;

  ps->nfds_max = max_i(fd + 1, ps->nfds_max);

  if (POLLIN & events)
    result = fds_insert_select(&ps->pfds_read, fd) && result;
  if (POLLOUT & events)
    result = fds_insert_select(&ps->pfds_write, fd) && result;
  if (POLLPRI & events)
    result = fds_insert_select(&ps->pfds_except, fd) && result;

  return result;
}

/**
 * Delete a file descriptor to wait for.
 */
static inline void
fds_drop(session_t *ps, int fd, short events) {
  // Drop fd from respective fd_set-s
  if (POLLIN & events && ps->pfds_read)
    FD_CLR(fd, ps->pfds_read);
  if (POLLOUT & events && ps->pfds_write)
    FD_CLR(fd, ps->pfds_write);
  if (POLLPRI & events && ps->pfds_except)
    FD_CLR(fd, ps->pfds_except);
}

#define CPY_FDS(key) \
  fd_set * key = NULL; \
  if (ps->key) { \
    key = malloc(sizeof(fd_set)); \
    memcpy(key, ps->key, sizeof(fd_set)); \
    if (!key) { \
      fprintf(stderr, "Failed to allocate memory for copying select() fdset.\n"); \
      exit(1); \
    } \
  } \

/**
 * Poll for changes.
 *
 * poll() is much better than select(), but ppoll() does not exist on
 * *BSD.
 */
static inline int
fds_poll(session_t *ps, struct timeval *ptv) {
  // Copy fds
  CPY_FDS(pfds_read);
  CPY_FDS(pfds_write);
  CPY_FDS(pfds_except);

  int ret = select(ps->nfds_max, pfds_read, pfds_write, pfds_except, ptv);

  free(pfds_read);
  free(pfds_write);
  free(pfds_except);

  return ret;
}
#undef CPY_FDS

/**
 * Wrapper of XFree() for convenience.
 *
 * Because a NULL pointer cannot be passed to XFree(), its man page says.
 */
static inline void
cxfree(void *data) {
  if (data)
    XFree(data);
}

/**
 * Wrapper of XInternAtom() for convenience.
 */
static inline Atom
get_atom(session_t *ps, const char *atom_name) {
  return XInternAtom(ps->dpy, atom_name, False);
}

/**
 * Return the painting target window.
 */
static inline Window
get_tgt_window(session_t *ps) {
  return ps->o.paint_on_overlay ? ps->overlay: ps->root;
}

/**
 * Find a window from window id in window linked list of the session.
 */
static inline win *
find_win(session_t *ps, Window id) {
  if (!id)
    return NULL;

  win *w;

  for (w = ps->list; w; w = w->next) {
    if (w->id == id && !w->destroyed)
      return w;
  }

  return 0;
}

/**
 * Find out the WM frame of a client window using existing data.
 *
 * @param id window ID
 * @return struct _win object of the found window, NULL if not found
 */
static inline win *
find_toplevel(session_t *ps, Window id) {
  if (!id)
    return NULL;

  for (win *w = ps->list; w; w = w->next) {
    if (w->client_win == id && !w->destroyed)
      return w;
  }

  return NULL;
}


/**
 * Check if current backend uses XRender for rendering.
 */
static inline bool
bkend_use_xrender(session_t *ps) {
  return BKEND_XRENDER == ps->o.backend
    || BKEND_XR_GLX_HYBRID == ps->o.backend;
}

/**
 * Check if current backend uses GLX.
 */
static inline bool
bkend_use_glx(session_t *ps) {
  return BKEND_GLX == ps->o.backend
    || BKEND_XR_GLX_HYBRID == ps->o.backend;
}

/**
 * Check if a window is really focused.
 */
static inline bool
win_is_focused_real(session_t *ps, const win *w) {
  return IsViewable == w->a.map_state && ps->active_win == w;
}

/**
 * Find out the currently focused window.
 *
 * @return struct _win object of the found window, NULL if not found
 */
static inline win *
find_focused(session_t *ps) {
  if (!ps->o.track_focus) return NULL;

  if (ps->active_win && win_is_focused_real(ps, ps->active_win))
    return ps->active_win;
  return NULL;
}

/**
 * Copies a region.
 */
static inline XserverRegion
copy_region(const session_t *ps, XserverRegion oldregion) {
  if (!oldregion)
    return None;

  XserverRegion region = XFixesCreateRegion(ps->dpy, NULL, 0);

  XFixesCopyRegion(ps->dpy, region, oldregion);

  return region;
}

/**
 * Destroy a <code>XserverRegion</code>.
 */
static inline void
free_region(session_t *ps, XserverRegion *p) {
  if (*p) {
    XFixesDestroyRegion(ps->dpy, *p);
    *p = None;
  }
}

/**
 * Free all regions in ps->all_damage_last .
 */
static inline void
free_all_damage_last(session_t *ps) {
  for (int i = 0; i < CGLX_MAX_BUFFER_AGE; ++i)
    free_region(ps, &ps->all_damage_last[i]);
}

#ifdef CONFIG_XSYNC
/**
 * Free a XSync fence.
 */
static inline void
free_fence(session_t *ps, XSyncFence *pfence) {
  if (*pfence)
    XSyncDestroyFence(ps->dpy, *pfence);
  *pfence = None;
}
#else
#define free_fence(ps, pfence) ((void) 0)
#endif

/**
 * Crop a rectangle by another rectangle.
 *
 * psrc and pdst cannot be the same.
 */
static inline void
rect_crop(XRectangle *pdst, const XRectangle *psrc, const XRectangle *pbound) {
  assert(psrc != pdst);
  pdst->x = max_i(psrc->x, pbound->x);
  pdst->y = max_i(psrc->y, pbound->y);
  pdst->width = max_i(0, min_i(psrc->x + psrc->width, pbound->x + pbound->width) - pdst->x);
  pdst->height = max_i(0, min_i(psrc->y + psrc->height, pbound->y + pbound->height) - pdst->y);
}

/**
 * Check if a rectangle includes the whole screen.
 */
static inline bool
rect_is_fullscreen(session_t *ps, int x, int y, unsigned wid, unsigned hei) {
  return (x <= 0 && y <= 0
      && (x + wid) >= ps->root_width && (y + hei) >= ps->root_height);
}

/**
 * Check if a window is a fullscreen window.
 *
 * It's not using w->border_size for performance measures.
 */
static inline bool
win_is_fullscreen(session_t *ps, const win *w) {
  return rect_is_fullscreen(ps, w->a.x, w->a.y, w->widthb, w->heightb)
      && !w->bounding_shaped;
}

/**
 * Determine if a window has a specific property.
 *
 * @param ps current session
 * @param w window to check
 * @param atom atom of property to check
 * @return 1 if it has the attribute, 0 otherwise
 */
static inline bool
wid_has_prop(const session_t *ps, Window w, Atom atom) {
  Atom type = None;
  int format;
  unsigned long nitems, after;
  unsigned char *data;

  if (Success == XGetWindowProperty(ps->dpy, w, atom, 0, 0, False,
        AnyPropertyType, &type, &format, &nitems, &after, &data)) {
    cxfree(data);
    if (type) return true;
  }

  return false;
}

winprop_t
wid_get_prop_adv(const session_t *ps, Window w, Atom atom, long offset,
    long length, Atom rtype, int rformat);

/**
 * Wrapper of wid_get_prop_adv().
 */
static inline winprop_t
wid_get_prop(const session_t *ps, Window wid, Atom atom, long length,
    Atom rtype, int rformat) {
  return wid_get_prop_adv(ps, wid, atom, 0L, length, rtype, rformat);
}

/**
 * Get the numeric property value from a win_prop_t.
 */
static inline long
winprop_get_int(winprop_t prop) {
  long tgt = 0;

  if (!prop.nitems)
    return 0;

  switch (prop.format) {
    case 8:   tgt = *(prop.data.p8);    break;
    case 16:  tgt = *(prop.data.p16);   break;
    case 32:  tgt = *(prop.data.p32);   break;
    default:  assert(0);
              break;
  }

  return tgt;
}

bool
wid_get_text_prop(session_t *ps, Window wid, Atom prop,
    char ***pstrlst, int *pnstr);

/**
 * Free a <code>winprop_t</code>.
 *
 * @param pprop pointer to the <code>winprop_t</code> to free.
 */
static inline void
free_winprop(winprop_t *pprop) {
  // Empty the whole structure to avoid possible issues
  if (pprop->data.p8) {
    cxfree(pprop->data.p8);
    pprop->data.p8 = NULL;
  }
  pprop->nitems = 0;
}

void
force_repaint(session_t *ps);

bool
vsync_init(session_t *ps);

void
vsync_deinit(session_t *ps);

#ifdef CONFIG_VSYNC_OPENGL
/** @name GLX
 */
///@{

#ifdef CONFIG_GLX_SYNC
void
xr_glx_sync(session_t *ps, Drawable d, XSyncFence *pfence);
#endif

bool
glx_init(session_t *ps, bool need_render);

void
glx_destroy(session_t *ps);

void
glx_on_root_change(session_t *ps);

bool
glx_init_blur(session_t *ps);

bool
glx_bind_pixmap(session_t *ps, glx_texture_t **pptex, Pixmap pixmap,
    unsigned width, unsigned height, unsigned depth);

void
glx_release_pixmap(session_t *ps, glx_texture_t *ptex);

void
glx_paint_pre(session_t *ps, XserverRegion *preg);

/**
 * Check if a texture is binded, or is binded to the given pixmap.
 */
static inline bool
glx_tex_binded(const glx_texture_t *ptex, Pixmap pixmap) {
  return ptex && ptex->glpixmap && ptex->texture
    && (!pixmap || pixmap == ptex->pixmap);
}

void
glx_set_clip(session_t *ps, XserverRegion reg, const reg_data_t *pcache_reg);

#ifdef CONFIG_VSYNC_OPENGL_GLSL
bool
glx_blur_dst(session_t *ps, int dx, int dy, int width, int height, float z,
    GLfloat factor_center,
    XserverRegion reg_tgt, const reg_data_t *pcache_reg,
    glx_blur_cache_t *pbc);
#endif

bool
glx_dim_dst(session_t *ps, int dx, int dy, int width, int height, float z,
    GLfloat factor, XserverRegion reg_tgt, const reg_data_t *pcache_reg);

bool
glx_render(session_t *ps, const glx_texture_t *ptex,
    int x, int y, int dx, int dy, int width, int height, int z,
    double opacity, bool neg,
    XserverRegion reg_tgt, const reg_data_t *pcache_reg);

bool
glx_render_specified_color(session_t *ps, int color, int dx, int dy, int width, int height, int z,
    XserverRegion reg_tgt, const reg_data_t *pcache_reg);

void
glx_swap_copysubbuffermesa(session_t *ps, XserverRegion reg);

#ifdef CONFIG_VSYNC_OPENGL_GLSL
GLuint
glx_create_shader(GLenum shader_type, const char *shader_str);

GLuint
glx_create_program(const GLuint * const shaders, int nshaders);
#endif

/**
 * Free a GLX texture.
 */
static inline void
free_texture_r(session_t *ps, GLuint *ptexture) {
  if (*ptexture) {
    assert(ps->glx_context);
    glDeleteTextures(1, ptexture);
    *ptexture = 0;
  }
}

/**
 * Free a GLX Framebuffer object.
 */
static inline void
free_glx_fbo(session_t *ps, GLuint *pfbo) {
#ifdef CONFIG_VSYNC_OPENGL_FBO
  if (*pfbo) {
    glDeleteFramebuffers(1, pfbo);
    *pfbo = 0;
  }
#endif
  assert(!*pfbo);
}

#ifdef CONFIG_VSYNC_OPENGL_GLSL
/**
 * Free data in glx_blur_cache_t on resize.
 */
static inline void
free_glx_bc_resize(session_t *ps, glx_blur_cache_t *pbc) {
  free_texture_r(ps, &pbc->textures[0]);
  free_texture_r(ps, &pbc->textures[1]);
  pbc->width = 0;
  pbc->height = 0;
}

/**
 * Free a glx_blur_cache_t
 */
static inline void
free_glx_bc(session_t *ps, glx_blur_cache_t *pbc) {
  free_glx_fbo(ps, &pbc->fbo);
  free_glx_bc_resize(ps, pbc);
}
#endif
#endif

/**
 * Free a glx_texture_t.
 */
static inline void
free_texture(session_t *ps, glx_texture_t **pptex) {
  glx_texture_t *ptex = *pptex;

  // Quit if there's nothing
  if (!ptex)
    return;

#ifdef CONFIG_VSYNC_OPENGL
  glx_release_pixmap(ps, ptex);

  free_texture_r(ps, &ptex->texture);

  // Free structure itself
  free(ptex);
  *pptex = NULL;
#endif
  assert(!*pptex);
}

/**
 * Add a OpenGL debugging marker.
 */
static inline void
glx_mark_(session_t *ps, const char *func, XID xid, bool start) {
#ifdef DEBUG_GLX_MARK
  if (bkend_use_glx(ps) && ps->glStringMarkerGREMEDY) {
    if (!func) func = "(unknown)";
    const char *postfix = (start ? " (start)": " (end)");
    char *str = malloc((strlen(func) + 12 + 2
          + strlen(postfix) + 5) * sizeof(char));
    strcpy(str, func);
    sprintf(str + strlen(str), "(%#010lx)%s", xid, postfix);
    ps->glStringMarkerGREMEDY(strlen(str), str);
    free(str);
  }
#endif
}

#define glx_mark(ps, xid, start) glx_mark_(ps, __func__, xid, start)

/**
 * Add a OpenGL debugging marker.
 */
static inline void
glx_mark_frame(session_t *ps) {
#ifdef DEBUG_GLX_MARK
  if (bkend_use_glx(ps) && ps->glFrameTerminatorGREMEDY)
    ps->glFrameTerminatorGREMEDY();
#endif
}

///@}

#ifdef CONFIG_XSYNC
#define xr_sync(ps, d, pfence) xr_sync_(ps, d, pfence)
#else
#define xr_sync(ps, d, pfence) xr_sync_(ps, d)
#endif

/**
 * Synchronizes a X Render drawable to ensure all pending painting requests
 * are completed.
 */
static inline void
xr_sync_(session_t *ps, Drawable d
#ifdef CONFIG_XSYNC
    , XSyncFence *pfence
#endif
    ) {
  if (!ps->o.xrender_sync)
    return;

  XSync(ps->dpy, False);
#ifdef CONFIG_XSYNC
  if (ps->o.xrender_sync_fence && ps->xsync_exists) {
    // TODO: If everybody just follows the rules stated in X Sync prototype,
    // we need only one fence per screen, but let's stay a bit cautious right
    // now
    XSyncFence tmp_fence = None;
    if (!pfence)
      pfence = &tmp_fence;
    assert(pfence);
    if (!*pfence)
      *pfence = XSyncCreateFence(ps->dpy, d, False);
    if (*pfence) {
      Bool triggered = False;
      /* if (XSyncQueryFence(ps->dpy, *pfence, &triggered) && triggered)
        XSyncResetFence(ps->dpy, *pfence); */
      // The fence may fail to be created (e.g. because of died drawable)
      assert(!XSyncQueryFence(ps->dpy, *pfence, &triggered) || !triggered);
      XSyncTriggerFence(ps->dpy, *pfence);
      XSyncAwaitFence(ps->dpy, pfence, 1);
      assert(!XSyncQueryFence(ps->dpy, *pfence, &triggered) || triggered);
    }
    else {
      printf_errf("(%#010lx): Failed to create X Sync fence.", d);
    }
    free_fence(ps, &tmp_fence);
    if (*pfence)
      XSyncResetFence(ps->dpy, *pfence);
  }
#endif
#ifdef CONFIG_GLX_SYNC
  xr_glx_sync(ps, d, pfence);
#endif
}

/** @name DBus handling
 */
///@{
#ifdef CONFIG_DBUS
/** @name DBus handling
 */
///@{
bool
cdbus_init(session_t *ps);

void
cdbus_destroy(session_t *ps);

void
cdbus_loop(session_t *ps);

void
cdbus_ev_win_added(session_t *ps, win *w);

void
cdbus_ev_win_destroyed(session_t *ps, win *w);

void
cdbus_ev_win_mapped(session_t *ps, win *w);

void
cdbus_ev_win_unmapped(session_t *ps, win *w);

void
cdbus_ev_win_focusout(session_t *ps, win *w);

void
cdbus_ev_win_focusin(session_t *ps, win *w);
//!@}

/** @name DBus hooks
 */
///@{
void
win_set_shadow_force(session_t *ps, win *w, switch_t val);

void
win_set_fade_force(session_t *ps, win *w, switch_t val);

void
win_set_focused_force(session_t *ps, win *w, switch_t val);

void
win_set_invert_color_force(session_t *ps, win *w, switch_t val);

void
opts_init_track_focus(session_t *ps);

void
opts_set_no_fading_openclose(session_t *ps, bool newval);

void
opts_set_no_fading_opacitychange(session_t *ps, bool newval);
//!@}
#endif

#ifdef CONFIG_C2
/** @name c2
 */
///@{

c2_lptr_t *
c2_parsed(session_t *ps, c2_lptr_t **pcondlst, const char *pattern,
    void *data);

#define c2_parse(ps, pcondlst, pattern) c2_parsed((ps), (pcondlst), (pattern), NULL)

c2_lptr_t *
c2_free_lptr(c2_lptr_t *lp);

bool
c2_matchd(session_t *ps, win *w, const c2_lptr_t *condlst,
    const c2_lptr_t **cache, void **pdata);

#define c2_match(ps, w, condlst, cache) c2_matchd((ps), (w), (condlst), \
    (cache), NULL)
#endif

///@}

#endif

/**
 * @brief Dump raw bytes in HEX format.
 *
 * @param data pointer to raw data
 * @param len length of data
 */
static inline void
hexdump(const char *data, int len) {
  static const int BYTE_PER_LN = 16;

  if (len <= 0)
    return;

  // Print header
  printf("%10s:", "Offset");
  for (int i = 0; i < BYTE_PER_LN; ++i)
    printf(" %2d", i);
  putchar('\n');

  // Dump content
  for (int offset = 0; offset < len; ++offset) {
    if (!(offset % BYTE_PER_LN))
      printf("0x%08x:", offset);

    printf(" %02hhx", data[offset]);

    if ((BYTE_PER_LN - 1) == offset % BYTE_PER_LN)
      putchar('\n');
  }
  if (len % BYTE_PER_LN)
    putchar('\n');

  fflush(stdout);
}