summaryrefslogtreecommitdiffstats
path: root/services/inputflinger/InputReader.h
blob: 34f20af4717a45bfb231a4561f7067066f3686ab (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
/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef _UI_INPUT_READER_H
#define _UI_INPUT_READER_H

#include "EventHub.h"
#include "PointerControllerInterface.h"
#include "InputListener.h"

#include <input/Input.h>
#include <input/VelocityControl.h>
#include <input/VelocityTracker.h>
#include <ui/DisplayInfo.h>
#include <utils/KeyedVector.h>
#include <utils/threads.h>
#include <utils/Timers.h>
#include <utils/RefBase.h>
#include <utils/String8.h>
#include <utils/BitSet.h>

#include <stddef.h>
#include <unistd.h>

// Maximum supported size of a vibration pattern.
// Must be at least 2.
#define MAX_VIBRATE_PATTERN_SIZE 100

// Maximum allowable delay value in a vibration pattern before
// which the delay will be truncated.
#define MAX_VIBRATE_PATTERN_DELAY_NSECS (1000000 * 1000000000LL)

namespace android {

class InputDevice;
class InputMapper;

/*
 * Describes how coordinates are mapped on a physical display.
 * See com.android.server.display.DisplayViewport.
 */
struct DisplayViewport {
    int32_t displayId; // -1 if invalid
    int32_t orientation;
    int32_t logicalLeft;
    int32_t logicalTop;
    int32_t logicalRight;
    int32_t logicalBottom;
    int32_t physicalLeft;
    int32_t physicalTop;
    int32_t physicalRight;
    int32_t physicalBottom;
    int32_t deviceWidth;
    int32_t deviceHeight;

    DisplayViewport() :
            displayId(ADISPLAY_ID_NONE), orientation(DISPLAY_ORIENTATION_0),
            logicalLeft(0), logicalTop(0), logicalRight(0), logicalBottom(0),
            physicalLeft(0), physicalTop(0), physicalRight(0), physicalBottom(0),
            deviceWidth(0), deviceHeight(0) {
    }

    bool operator==(const DisplayViewport& other) const {
        return displayId == other.displayId
                && orientation == other.orientation
                && logicalLeft == other.logicalLeft
                && logicalTop == other.logicalTop
                && logicalRight == other.logicalRight
                && logicalBottom == other.logicalBottom
                && physicalLeft == other.physicalLeft
                && physicalTop == other.physicalTop
                && physicalRight == other.physicalRight
                && physicalBottom == other.physicalBottom
                && deviceWidth == other.deviceWidth
                && deviceHeight == other.deviceHeight;
    }

    bool operator!=(const DisplayViewport& other) const {
        return !(*this == other);
    }

    inline bool isValid() const {
        return displayId >= 0;
    }

    void setNonDisplayViewport(int32_t width, int32_t height) {
        displayId = ADISPLAY_ID_NONE;
        orientation = DISPLAY_ORIENTATION_0;
        logicalLeft = 0;
        logicalTop = 0;
        logicalRight = width;
        logicalBottom = height;
        physicalLeft = 0;
        physicalTop = 0;
        physicalRight = width;
        physicalBottom = height;
        deviceWidth = width;
        deviceHeight = height;
    }
};

/*
 * Input reader configuration.
 *
 * Specifies various options that modify the behavior of the input reader.
 */
struct InputReaderConfiguration {
    // Describes changes that have occurred.
    enum {
        // The pointer speed changed.
        CHANGE_POINTER_SPEED = 1 << 0,

        // The pointer gesture control changed.
        CHANGE_POINTER_GESTURE_ENABLEMENT = 1 << 1,

        // The display size or orientation changed.
        CHANGE_DISPLAY_INFO = 1 << 2,

        // The visible touches option changed.
        CHANGE_SHOW_TOUCHES = 1 << 3,

        // The keyboard layouts must be reloaded.
        CHANGE_KEYBOARD_LAYOUTS = 1 << 4,

        // The device name alias supplied by the may have changed for some devices.
        CHANGE_DEVICE_ALIAS = 1 << 5,

        // The location calibration matrix changed.
        TOUCH_AFFINE_TRANSFORMATION = 1 << 6,

        // All devices must be reopened.
        CHANGE_MUST_REOPEN = 1 << 31,
    };

    // Gets the amount of time to disable virtual keys after the screen is touched
    // in order to filter out accidental virtual key presses due to swiping gestures
    // or taps near the edge of the display.  May be 0 to disable the feature.
    nsecs_t virtualKeyQuietTime;

    // The excluded device names for the platform.
    // Devices with these names will be ignored.
    Vector<String8> excludedDeviceNames;

    // Velocity control parameters for mouse pointer movements.
    VelocityControlParameters pointerVelocityControlParameters;

    // Velocity control parameters for mouse wheel movements.
    VelocityControlParameters wheelVelocityControlParameters;

    // True if pointer gestures are enabled.
    bool pointerGesturesEnabled;

    // Quiet time between certain pointer gesture transitions.
    // Time to allow for all fingers or buttons to settle into a stable state before
    // starting a new gesture.
    nsecs_t pointerGestureQuietInterval;

    // The minimum speed that a pointer must travel for us to consider switching the active
    // touch pointer to it during a drag.  This threshold is set to avoid switching due
    // to noise from a finger resting on the touch pad (perhaps just pressing it down).
    float pointerGestureDragMinSwitchSpeed; // in pixels per second

    // Tap gesture delay time.
    // The time between down and up must be less than this to be considered a tap.
    nsecs_t pointerGestureTapInterval;

    // Tap drag gesture delay time.
    // The time between the previous tap's up and the next down must be less than
    // this to be considered a drag.  Otherwise, the previous tap is finished and a
    // new tap begins.
    //
    // Note that the previous tap will be held down for this entire duration so this
    // interval must be shorter than the long press timeout.
    nsecs_t pointerGestureTapDragInterval;

    // The distance in pixels that the pointer is allowed to move from initial down
    // to up and still be called a tap.
    float pointerGestureTapSlop; // in pixels

    // Time after the first touch points go down to settle on an initial centroid.
    // This is intended to be enough time to handle cases where the user puts down two
    // fingers at almost but not quite exactly the same time.
    nsecs_t pointerGestureMultitouchSettleInterval;

    // The transition from PRESS to SWIPE or FREEFORM gesture mode is made when
    // at least two pointers have moved at least this far from their starting place.
    float pointerGestureMultitouchMinDistance; // in pixels

    // The transition from PRESS to SWIPE gesture mode can only occur when the
    // cosine of the angle between the two vectors is greater than or equal to than this value
    // which indicates that the vectors are oriented in the same direction.
    // When the vectors are oriented in the exactly same direction, the cosine is 1.0.
    // (In exactly opposite directions, the cosine is -1.0.)
    float pointerGestureSwipeTransitionAngleCosine;

    // The transition from PRESS to SWIPE gesture mode can only occur when the
    // fingers are no more than this far apart relative to the diagonal size of
    // the touch pad.  For example, a ratio of 0.5 means that the fingers must be
    // no more than half the diagonal size of the touch pad apart.
    float pointerGestureSwipeMaxWidthRatio;

    // The gesture movement speed factor relative to the size of the display.
    // Movement speed applies when the fingers are moving in the same direction.
    // Without acceleration, a full swipe of the touch pad diagonal in movement mode
    // will cover this portion of the display diagonal.
    float pointerGestureMovementSpeedRatio;

    // The gesture zoom speed factor relative to the size of the display.
    // Zoom speed applies when the fingers are mostly moving relative to each other
    // to execute a scale gesture or similar.
    // Without acceleration, a full swipe of the touch pad diagonal in zoom mode
    // will cover this portion of the display diagonal.
    float pointerGestureZoomSpeedRatio;

    // True to show the location of touches on the touch screen as spots.
    bool showTouches;

    InputReaderConfiguration() :
            virtualKeyQuietTime(0),
            pointerVelocityControlParameters(1.0f, 500.0f, 3000.0f, 3.0f),
            wheelVelocityControlParameters(1.0f, 15.0f, 50.0f, 4.0f),
            pointerGesturesEnabled(true),
            pointerGestureQuietInterval(100 * 1000000LL), // 100 ms
            pointerGestureDragMinSwitchSpeed(50), // 50 pixels per second
            pointerGestureTapInterval(150 * 1000000LL), // 150 ms
            pointerGestureTapDragInterval(150 * 1000000LL), // 150 ms
            pointerGestureTapSlop(10.0f), // 10 pixels
            pointerGestureMultitouchSettleInterval(100 * 1000000LL), // 100 ms
            pointerGestureMultitouchMinDistance(15), // 15 pixels
            pointerGestureSwipeTransitionAngleCosine(0.2588f), // cosine of 75 degrees
            pointerGestureSwipeMaxWidthRatio(0.25f),
            pointerGestureMovementSpeedRatio(0.8f),
            pointerGestureZoomSpeedRatio(0.3f),
            showTouches(false) { }

    bool getDisplayInfo(bool external, DisplayViewport* outViewport) const;
    void setDisplayInfo(bool external, const DisplayViewport& viewport);

private:
    DisplayViewport mInternalDisplay;
    DisplayViewport mExternalDisplay;
};


struct TouchAffineTransformation {
    float x_scale;
    float x_ymix;
    float x_offset;
    float y_xmix;
    float y_scale;
    float y_offset;

    TouchAffineTransformation() :
        x_scale(1.0f), x_ymix(0.0f), x_offset(0.0f),
        y_xmix(0.0f), y_scale(1.0f), y_offset(0.0f) {
    }

    TouchAffineTransformation(float xscale, float xymix, float xoffset,
            float yxmix, float yscale, float yoffset) :
        x_scale(xscale), x_ymix(xymix), x_offset(xoffset),
        y_xmix(yxmix), y_scale(yscale), y_offset(yoffset) {
    }

    void applyTo(float& x, float& y) const;
};


/*
 * Input reader policy interface.
 *
 * The input reader policy is used by the input reader to interact with the Window Manager
 * and other system components.
 *
 * The actual implementation is partially supported by callbacks into the DVM
 * via JNI.  This interface is also mocked in the unit tests.
 *
 * These methods must NOT re-enter the input reader since they may be called while
 * holding the input reader lock.
 */
class InputReaderPolicyInterface : public virtual RefBase {
protected:
    InputReaderPolicyInterface() { }
    virtual ~InputReaderPolicyInterface() { }

public:
    /* Gets the input reader configuration. */
    virtual void getReaderConfiguration(InputReaderConfiguration* outConfig) = 0;

    /* Gets a pointer controller associated with the specified cursor device (ie. a mouse). */
    virtual sp<PointerControllerInterface> obtainPointerController(int32_t deviceId) = 0;

    /* Notifies the input reader policy that some input devices have changed
     * and provides information about all current input devices.
     */
    virtual void notifyInputDevicesChanged(const Vector<InputDeviceInfo>& inputDevices) = 0;

    /* Gets the keyboard layout for a particular input device. */
    virtual sp<KeyCharacterMap> getKeyboardLayoutOverlay(
            const InputDeviceIdentifier& identifier) = 0;

    /* Gets a user-supplied alias for a particular input device, or an empty string if none. */
    virtual String8 getDeviceAlias(const InputDeviceIdentifier& identifier) = 0;

    /* Gets the affine calibration associated with the specified device. */
    virtual TouchAffineTransformation getTouchAffineTransformation(
            const String8& inputDeviceDescriptor, int32_t surfaceRotation) = 0;
};


/* Processes raw input events and sends cooked event data to an input listener. */
class InputReaderInterface : public virtual RefBase {
protected:
    InputReaderInterface() { }
    virtual ~InputReaderInterface() { }

public:
    /* Dumps the state of the input reader.
     *
     * This method may be called on any thread (usually by the input manager). */
    virtual void dump(String8& dump) = 0;

    /* Called by the heatbeat to ensures that the reader has not deadlocked. */
    virtual void monitor() = 0;

    /* Runs a single iteration of the processing loop.
     * Nominally reads and processes one incoming message from the EventHub.
     *
     * This method should be called on the input reader thread.
     */
    virtual void loopOnce() = 0;

    /* Gets information about all input devices.
     *
     * This method may be called on any thread (usually by the input manager).
     */
    virtual void getInputDevices(Vector<InputDeviceInfo>& outInputDevices) = 0;

    /* Query current input state. */
    virtual int32_t getScanCodeState(int32_t deviceId, uint32_t sourceMask,
            int32_t scanCode) = 0;
    virtual int32_t getKeyCodeState(int32_t deviceId, uint32_t sourceMask,
            int32_t keyCode) = 0;
    virtual int32_t getSwitchState(int32_t deviceId, uint32_t sourceMask,
            int32_t sw) = 0;

    /* Determine whether physical keys exist for the given framework-domain key codes. */
    virtual bool hasKeys(int32_t deviceId, uint32_t sourceMask,
            size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags) = 0;

    /* Requests that a reconfiguration of all input devices.
     * The changes flag is a bitfield that indicates what has changed and whether
     * the input devices must all be reopened. */
    virtual void requestRefreshConfiguration(uint32_t changes) = 0;

    /* Controls the vibrator of a particular input device. */
    virtual void vibrate(int32_t deviceId, const nsecs_t* pattern, size_t patternSize,
            ssize_t repeat, int32_t token) = 0;
    virtual void cancelVibrate(int32_t deviceId, int32_t token) = 0;
};


/* Internal interface used by individual input devices to access global input device state
 * and parameters maintained by the input reader.
 */
class InputReaderContext {
public:
    InputReaderContext() { }
    virtual ~InputReaderContext() { }

    virtual void updateGlobalMetaState() = 0;
    virtual int32_t getGlobalMetaState() = 0;

    virtual void disableVirtualKeysUntil(nsecs_t time) = 0;
    virtual bool shouldDropVirtualKey(nsecs_t now,
            InputDevice* device, int32_t keyCode, int32_t scanCode) = 0;

    virtual void fadePointer() = 0;

    virtual void requestTimeoutAtTime(nsecs_t when) = 0;
    virtual int32_t bumpGeneration() = 0;

    virtual InputReaderPolicyInterface* getPolicy() = 0;
    virtual InputListenerInterface* getListener() = 0;
    virtual EventHubInterface* getEventHub() = 0;
};


/* The input reader reads raw event data from the event hub and processes it into input events
 * that it sends to the input listener.  Some functions of the input reader, such as early
 * event filtering in low power states, are controlled by a separate policy object.
 *
 * The InputReader owns a collection of InputMappers.  Most of the work it does happens
 * on the input reader thread but the InputReader can receive queries from other system
 * components running on arbitrary threads.  To keep things manageable, the InputReader
 * uses a single Mutex to guard its state.  The Mutex may be held while calling into the
 * EventHub or the InputReaderPolicy but it is never held while calling into the
 * InputListener.
 */
class InputReader : public InputReaderInterface {
public:
    InputReader(const sp<EventHubInterface>& eventHub,
            const sp<InputReaderPolicyInterface>& policy,
            const sp<InputListenerInterface>& listener);
    virtual ~InputReader();

    virtual void dump(String8& dump);
    virtual void monitor();

    virtual void loopOnce();

    virtual void getInputDevices(Vector<InputDeviceInfo>& outInputDevices);

    virtual int32_t getScanCodeState(int32_t deviceId, uint32_t sourceMask,
            int32_t scanCode);
    virtual int32_t getKeyCodeState(int32_t deviceId, uint32_t sourceMask,
            int32_t keyCode);
    virtual int32_t getSwitchState(int32_t deviceId, uint32_t sourceMask,
            int32_t sw);

    virtual bool hasKeys(int32_t deviceId, uint32_t sourceMask,
            size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags);

    virtual void requestRefreshConfiguration(uint32_t changes);

    virtual void vibrate(int32_t deviceId, const nsecs_t* pattern, size_t patternSize,
            ssize_t repeat, int32_t token);
    virtual void cancelVibrate(int32_t deviceId, int32_t token);

protected:
    // These members are protected so they can be instrumented by test cases.
    virtual InputDevice* createDeviceLocked(int32_t deviceId, int32_t controllerNumber,
            const InputDeviceIdentifier& identifier, uint32_t classes);

    class ContextImpl : public InputReaderContext {
        InputReader* mReader;

    public:
        ContextImpl(InputReader* reader);

        virtual void updateGlobalMetaState();
        virtual int32_t getGlobalMetaState();
        virtual void disableVirtualKeysUntil(nsecs_t time);
        virtual bool shouldDropVirtualKey(nsecs_t now,
                InputDevice* device, int32_t keyCode, int32_t scanCode);
        virtual void fadePointer();
        virtual void requestTimeoutAtTime(nsecs_t when);
        virtual int32_t bumpGeneration();
        virtual InputReaderPolicyInterface* getPolicy();
        virtual InputListenerInterface* getListener();
        virtual EventHubInterface* getEventHub();
    } mContext;

    friend class ContextImpl;

private:
    Mutex mLock;

    Condition mReaderIsAliveCondition;

    sp<EventHubInterface> mEventHub;
    sp<InputReaderPolicyInterface> mPolicy;
    sp<QueuedInputListener> mQueuedListener;

    InputReaderConfiguration mConfig;

    // The event queue.
    static const int EVENT_BUFFER_SIZE = 256;
    RawEvent mEventBuffer[EVENT_BUFFER_SIZE];

    KeyedVector<int32_t, InputDevice*> mDevices;

    // low-level input event decoding and device management
    void processEventsLocked(const RawEvent* rawEvents, size_t count);

    void addDeviceLocked(nsecs_t when, int32_t deviceId);
    void removeDeviceLocked(nsecs_t when, int32_t deviceId);
    void processEventsForDeviceLocked(int32_t deviceId, const RawEvent* rawEvents, size_t count);
    void timeoutExpiredLocked(nsecs_t when);

    void handleConfigurationChangedLocked(nsecs_t when);

    int32_t mGlobalMetaState;
    void updateGlobalMetaStateLocked();
    int32_t getGlobalMetaStateLocked();

    void fadePointerLocked();

    int32_t mGeneration;
    int32_t bumpGenerationLocked();

    void getInputDevicesLocked(Vector<InputDeviceInfo>& outInputDevices);

    nsecs_t mDisableVirtualKeysTimeout;
    void disableVirtualKeysUntilLocked(nsecs_t time);
    bool shouldDropVirtualKeyLocked(nsecs_t now,
            InputDevice* device, int32_t keyCode, int32_t scanCode);

    nsecs_t mNextTimeout;
    void requestTimeoutAtTimeLocked(nsecs_t when);

    uint32_t mConfigurationChangesToRefresh;
    void refreshConfigurationLocked(uint32_t changes);

    // state queries
    typedef int32_t (InputDevice::*GetStateFunc)(uint32_t sourceMask, int32_t code);
    int32_t getStateLocked(int32_t deviceId, uint32_t sourceMask, int32_t code,
            GetStateFunc getStateFunc);
    bool markSupportedKeyCodesLocked(int32_t deviceId, uint32_t sourceMask, size_t numCodes,
            const int32_t* keyCodes, uint8_t* outFlags);
};


/* Reads raw events from the event hub and processes them, endlessly. */
class InputReaderThread : public Thread {
public:
    InputReaderThread(const sp<InputReaderInterface>& reader);
    virtual ~InputReaderThread();

private:
    sp<InputReaderInterface> mReader;

    virtual bool threadLoop();
};


/* Represents the state of a single input device. */
class InputDevice {
public:
    InputDevice(InputReaderContext* context, int32_t id, int32_t generation, int32_t
            controllerNumber, const InputDeviceIdentifier& identifier, uint32_t classes);
    ~InputDevice();

    inline InputReaderContext* getContext() { return mContext; }
    inline int32_t getId() const { return mId; }
    inline int32_t getControllerNumber() const { return mControllerNumber; }
    inline int32_t getGeneration() const { return mGeneration; }
    inline const String8& getName() const { return mIdentifier.name; }
    inline const String8& getDescriptor() { return mIdentifier.descriptor; }
    inline uint32_t getClasses() const { return mClasses; }
    inline uint32_t getSources() const { return mSources; }

    inline bool isExternal() { return mIsExternal; }
    inline void setExternal(bool external) { mIsExternal = external; }

    inline bool isIgnored() { return mMappers.isEmpty(); }

    void dump(String8& dump);
    void addMapper(InputMapper* mapper);
    void configure(nsecs_t when, const InputReaderConfiguration* config, uint32_t changes);
    void reset(nsecs_t when);
    void process(const RawEvent* rawEvents, size_t count);
    void timeoutExpired(nsecs_t when);

    void getDeviceInfo(InputDeviceInfo* outDeviceInfo);
    int32_t getKeyCodeState(uint32_t sourceMask, int32_t keyCode);
    int32_t getScanCodeState(uint32_t sourceMask, int32_t scanCode);
    int32_t getSwitchState(uint32_t sourceMask, int32_t switchCode);
    bool markSupportedKeyCodes(uint32_t sourceMask, size_t numCodes,
            const int32_t* keyCodes, uint8_t* outFlags);
    void vibrate(const nsecs_t* pattern, size_t patternSize, ssize_t repeat, int32_t token);
    void cancelVibrate(int32_t token);
    void cancelTouch(nsecs_t when);

    int32_t getMetaState();

    void fadePointer();

    void bumpGeneration();

    void notifyReset(nsecs_t when);

    inline const PropertyMap& getConfiguration() { return mConfiguration; }
    inline EventHubInterface* getEventHub() { return mContext->getEventHub(); }

    bool hasKey(int32_t code) {
        return getEventHub()->hasScanCode(mId, code);
    }

    bool hasAbsoluteAxis(int32_t code) {
        RawAbsoluteAxisInfo info;
        getEventHub()->getAbsoluteAxisInfo(mId, code, &info);
        return info.valid;
    }

    bool isKeyPressed(int32_t code) {
        return getEventHub()->getScanCodeState(mId, code) == AKEY_STATE_DOWN;
    }

    int32_t getAbsoluteAxisValue(int32_t code) {
        int32_t value;
        getEventHub()->getAbsoluteAxisValue(mId, code, &value);
        return value;
    }

private:
    InputReaderContext* mContext;
    int32_t mId;
    int32_t mGeneration;
    int32_t mControllerNumber;
    InputDeviceIdentifier mIdentifier;
    String8 mAlias;
    uint32_t mClasses;

    Vector<InputMapper*> mMappers;

    uint32_t mSources;
    bool mIsExternal;
    bool mDropUntilNextSync;

    typedef int32_t (InputMapper::*GetStateFunc)(uint32_t sourceMask, int32_t code);
    int32_t getState(uint32_t sourceMask, int32_t code, GetStateFunc getStateFunc);

    PropertyMap mConfiguration;
};


/* Keeps track of the state of mouse or touch pad buttons. */
class CursorButtonAccumulator {
public:
    CursorButtonAccumulator();
    void reset(InputDevice* device);

    void process(const RawEvent* rawEvent);

    uint32_t getButtonState() const;

private:
    bool mBtnLeft;
    bool mBtnRight;
    bool mBtnMiddle;
    bool mBtnBack;
    bool mBtnSide;
    bool mBtnForward;
    bool mBtnExtra;
    bool mBtnTask;

    void clearButtons();
};


/* Keeps track of cursor movements. */

class CursorMotionAccumulator {
public:
    CursorMotionAccumulator();
    void reset(InputDevice* device);

    void process(const RawEvent* rawEvent);
    void finishSync();

    inline int32_t getRelativeX() const { return mRelX; }
    inline int32_t getRelativeY() const { return mRelY; }

private:
    int32_t mRelX;
    int32_t mRelY;

    void clearRelativeAxes();
};


/* Keeps track of cursor scrolling motions. */

class CursorScrollAccumulator {
public:
    CursorScrollAccumulator();
    void configure(InputDevice* device);
    void reset(InputDevice* device);

    void process(const RawEvent* rawEvent);
    void finishSync();

    inline bool haveRelativeVWheel() const { return mHaveRelWheel; }
    inline bool haveRelativeHWheel() const { return mHaveRelHWheel; }

    inline int32_t getRelativeX() const { return mRelX; }
    inline int32_t getRelativeY() const { return mRelY; }
    inline int32_t getRelativeVWheel() const { return mRelWheel; }
    inline int32_t getRelativeHWheel() const { return mRelHWheel; }

private:
    bool mHaveRelWheel;
    bool mHaveRelHWheel;

    int32_t mRelX;
    int32_t mRelY;
    int32_t mRelWheel;
    int32_t mRelHWheel;

    void clearRelativeAxes();
};


/* Keeps track of the state of touch, stylus and tool buttons. */
class TouchButtonAccumulator {
public:
    TouchButtonAccumulator();
    void configure(InputDevice* device);
    void reset(InputDevice* device);

    void process(const RawEvent* rawEvent);

    uint32_t getButtonState() const;
    int32_t getToolType() const;
    bool isToolActive() const;
    bool isHovering() const;
    bool hasStylus() const;

private:
    bool mHaveBtnTouch;
    bool mHaveStylus;

    bool mBtnTouch;
    bool mBtnStylus;
    bool mBtnStylus2;
    bool mBtnToolFinger;
    bool mBtnToolPen;
    bool mBtnToolRubber;
    bool mBtnToolBrush;
    bool mBtnToolPencil;
    bool mBtnToolAirbrush;
    bool mBtnToolMouse;
    bool mBtnToolLens;
    bool mBtnToolDoubleTap;
    bool mBtnToolTripleTap;
    bool mBtnToolQuadTap;

    void clearButtons();
};


/* Raw axis information from the driver. */
struct RawPointerAxes {
    RawAbsoluteAxisInfo x;
    RawAbsoluteAxisInfo y;
    RawAbsoluteAxisInfo pressure;
    RawAbsoluteAxisInfo touchMajor;
    RawAbsoluteAxisInfo touchMinor;
    RawAbsoluteAxisInfo toolMajor;
    RawAbsoluteAxisInfo toolMinor;
    RawAbsoluteAxisInfo orientation;
    RawAbsoluteAxisInfo distance;
    RawAbsoluteAxisInfo tiltX;
    RawAbsoluteAxisInfo tiltY;
    RawAbsoluteAxisInfo trackingId;
    RawAbsoluteAxisInfo slot;

    RawPointerAxes();
    void clear();
};


/* Raw data for a collection of pointers including a pointer id mapping table. */
struct RawPointerData {
    struct Pointer {
        uint32_t id;
        int32_t x;
        int32_t y;
        int32_t pressure;
        int32_t touchMajor;
        int32_t touchMinor;
        int32_t toolMajor;
        int32_t toolMinor;
        int32_t orientation;
        int32_t distance;
        int32_t tiltX;
        int32_t tiltY;
        int32_t toolType; // a fully decoded AMOTION_EVENT_TOOL_TYPE constant
        bool isHovering;
    };

    uint32_t pointerCount;
    Pointer pointers[MAX_POINTERS];
    BitSet32 hoveringIdBits, touchingIdBits;
    uint32_t idToIndex[MAX_POINTER_ID + 1];

    RawPointerData();
    void clear();
    void copyFrom(const RawPointerData& other);
    void getCentroidOfTouchingPointers(float* outX, float* outY) const;

    inline void markIdBit(uint32_t id, bool isHovering) {
        if (isHovering) {
            hoveringIdBits.markBit(id);
        } else {
            touchingIdBits.markBit(id);
        }
    }

    inline void clearIdBits() {
        hoveringIdBits.clear();
        touchingIdBits.clear();
    }

    inline const Pointer& pointerForId(uint32_t id) const {
        return pointers[idToIndex[id]];
    }

    inline bool isHovering(uint32_t pointerIndex) {
        return pointers[pointerIndex].isHovering;
    }
};


/* Cooked data for a collection of pointers including a pointer id mapping table. */
struct CookedPointerData {
    uint32_t pointerCount;
    PointerProperties pointerProperties[MAX_POINTERS];
    PointerCoords pointerCoords[MAX_POINTERS];
    BitSet32 hoveringIdBits, touchingIdBits;
    uint32_t idToIndex[MAX_POINTER_ID + 1];

    CookedPointerData();
    void clear();
    void copyFrom(const CookedPointerData& other);

    inline const PointerCoords& pointerCoordsForId(uint32_t id) const {
        return pointerCoords[idToIndex[id]];
    }

    inline bool isHovering(uint32_t pointerIndex) {
        return hoveringIdBits.hasBit(pointerProperties[pointerIndex].id);
    }
};


/* Keeps track of the state of single-touch protocol. */
class SingleTouchMotionAccumulator {
public:
    SingleTouchMotionAccumulator();

    void process(const RawEvent* rawEvent);
    void reset(InputDevice* device);

    inline int32_t getAbsoluteX() const { return mAbsX; }
    inline int32_t getAbsoluteY() const { return mAbsY; }
    inline int32_t getAbsolutePressure() const { return mAbsPressure; }
    inline int32_t getAbsoluteToolWidth() const { return mAbsToolWidth; }
    inline int32_t getAbsoluteDistance() const { return mAbsDistance; }
    inline int32_t getAbsoluteTiltX() const { return mAbsTiltX; }
    inline int32_t getAbsoluteTiltY() const { return mAbsTiltY; }

private:
    int32_t mAbsX;
    int32_t mAbsY;
    int32_t mAbsPressure;
    int32_t mAbsToolWidth;
    int32_t mAbsDistance;
    int32_t mAbsTiltX;
    int32_t mAbsTiltY;

    void clearAbsoluteAxes();
};


/* Keeps track of the state of multi-touch protocol. */
class MultiTouchMotionAccumulator {
public:
    class Slot {
    public:
        inline bool isInUse() const { return mInUse; }
        inline int32_t getX() const { return mAbsMTPositionX; }
        inline int32_t getY() const { return mAbsMTPositionY; }
        inline int32_t getTouchMajor() const { return mAbsMTTouchMajor; }
        inline int32_t getTouchMinor() const {
            return mHaveAbsMTTouchMinor ? mAbsMTTouchMinor : mAbsMTTouchMajor; }
        inline int32_t getToolMajor() const { return mAbsMTWidthMajor; }
        inline int32_t getToolMinor() const {
            return mHaveAbsMTWidthMinor ? mAbsMTWidthMinor : mAbsMTWidthMajor; }
        inline int32_t getOrientation() const { return mAbsMTOrientation; }
        inline int32_t getTrackingId() const { return mAbsMTTrackingId; }
        inline int32_t getPressure() const { return mAbsMTPressure; }
        inline int32_t getDistance() const { return mAbsMTDistance; }
        inline int32_t getToolType() const;

    private:
        friend class MultiTouchMotionAccumulator;

        bool mInUse;
        bool mHaveAbsMTTouchMinor;
        bool mHaveAbsMTWidthMinor;
        bool mHaveAbsMTToolType;

        int32_t mAbsMTPositionX;
        int32_t mAbsMTPositionY;
        int32_t mAbsMTTouchMajor;
        int32_t mAbsMTTouchMinor;
        int32_t mAbsMTWidthMajor;
        int32_t mAbsMTWidthMinor;
        int32_t mAbsMTOrientation;
        int32_t mAbsMTTrackingId;
        int32_t mAbsMTPressure;
        int32_t mAbsMTDistance;
        int32_t mAbsMTToolType;

        Slot();
        void clear();
    };

    MultiTouchMotionAccumulator();
    ~MultiTouchMotionAccumulator();

    void configure(InputDevice* device, size_t slotCount, bool usingSlotsProtocol);
    void reset(InputDevice* device);
    void process(const RawEvent* rawEvent);
    void finishSync();
    bool hasStylus() const;

    inline size_t getSlotCount() const { return mSlotCount; }
    inline const Slot* getSlot(size_t index) const { return &mSlots[index]; }

private:
    int32_t mCurrentSlot;
    Slot* mSlots;
    size_t mSlotCount;
    bool mUsingSlotsProtocol;
    bool mHaveStylus;

    void clearSlots(int32_t initialSlot);
};


/* An input mapper transforms raw input events into cooked event data.
 * A single input device can have multiple associated input mappers in order to interpret
 * different classes of events.
 *
 * InputMapper lifecycle:
 * - create
 * - configure with 0 changes
 * - reset
 * - process, process, process (may occasionally reconfigure with non-zero changes or reset)
 * - reset
 * - destroy
 */
class InputMapper {
public:
    InputMapper(InputDevice* device);
    virtual ~InputMapper();

    inline InputDevice* getDevice() { return mDevice; }
    inline int32_t getDeviceId() { return mDevice->getId(); }
    inline const String8 getDeviceName() { return mDevice->getName(); }
    inline InputReaderContext* getContext() { return mContext; }
    inline InputReaderPolicyInterface* getPolicy() { return mContext->getPolicy(); }
    inline InputListenerInterface* getListener() { return mContext->getListener(); }
    inline EventHubInterface* getEventHub() { return mContext->getEventHub(); }

    virtual uint32_t getSources() = 0;
    virtual void populateDeviceInfo(InputDeviceInfo* deviceInfo);
    virtual void dump(String8& dump);
    virtual void configure(nsecs_t when, const InputReaderConfiguration* config, uint32_t changes);
    virtual void reset(nsecs_t when);
    virtual void process(const RawEvent* rawEvent) = 0;
    virtual void timeoutExpired(nsecs_t when);

    virtual int32_t getKeyCodeState(uint32_t sourceMask, int32_t keyCode);
    virtual int32_t getScanCodeState(uint32_t sourceMask, int32_t scanCode);
    virtual int32_t getSwitchState(uint32_t sourceMask, int32_t switchCode);
    virtual bool markSupportedKeyCodes(uint32_t sourceMask, size_t numCodes,
            const int32_t* keyCodes, uint8_t* outFlags);
    virtual void vibrate(const nsecs_t* pattern, size_t patternSize, ssize_t repeat,
            int32_t token);
    virtual void cancelVibrate(int32_t token);
    virtual void cancelTouch(nsecs_t when);

    virtual int32_t getMetaState();

    virtual void fadePointer();

protected:
    InputDevice* mDevice;
    InputReaderContext* mContext;

    status_t getAbsoluteAxisInfo(int32_t axis, RawAbsoluteAxisInfo* axisInfo);
    void bumpGeneration();

    static void dumpRawAbsoluteAxisInfo(String8& dump,
            const RawAbsoluteAxisInfo& axis, const char* name);
};


class SwitchInputMapper : public InputMapper {
public:
    SwitchInputMapper(InputDevice* device);
    virtual ~SwitchInputMapper();

    virtual uint32_t getSources();
    virtual void process(const RawEvent* rawEvent);

    virtual int32_t getSwitchState(uint32_t sourceMask, int32_t switchCode);
    virtual void dump(String8& dump);

private:
    uint32_t mSwitchValues;
    uint32_t mUpdatedSwitchMask;

    void processSwitch(int32_t switchCode, int32_t switchValue);
    void sync(nsecs_t when);
};


class VibratorInputMapper : public InputMapper {
public:
    VibratorInputMapper(InputDevice* device);
    virtual ~VibratorInputMapper();

    virtual uint32_t getSources();
    virtual void populateDeviceInfo(InputDeviceInfo* deviceInfo);
    virtual void process(const RawEvent* rawEvent);

    virtual void vibrate(const nsecs_t* pattern, size_t patternSize, ssize_t repeat,
            int32_t token);
    virtual void cancelVibrate(int32_t token);
    virtual void timeoutExpired(nsecs_t when);
    virtual void dump(String8& dump);

private:
    bool mVibrating;
    nsecs_t mPattern[MAX_VIBRATE_PATTERN_SIZE];
    size_t mPatternSize;
    ssize_t mRepeat;
    int32_t mToken;
    ssize_t mIndex;
    nsecs_t mNextStepTime;

    void nextStep();
    void stopVibrating();
};


class KeyboardInputMapper : public InputMapper {
public:
    KeyboardInputMapper(InputDevice* device, uint32_t source, int32_t keyboardType);
    virtual ~KeyboardInputMapper();

    virtual uint32_t getSources();
    virtual void populateDeviceInfo(InputDeviceInfo* deviceInfo);
    virtual void dump(String8& dump);
    virtual void configure(nsecs_t when, const InputReaderConfiguration* config, uint32_t changes);
    virtual void reset(nsecs_t when);
    virtual void process(const RawEvent* rawEvent);

    virtual int32_t getKeyCodeState(uint32_t sourceMask, int32_t keyCode);
    virtual int32_t getScanCodeState(uint32_t sourceMask, int32_t scanCode);
    virtual bool markSupportedKeyCodes(uint32_t sourceMask, size_t numCodes,
            const int32_t* keyCodes, uint8_t* outFlags);

    virtual int32_t getMetaState();

private:
    struct KeyDown {
        int32_t keyCode;
        int32_t scanCode;
    };

    uint32_t mSource;
    int32_t mKeyboardType;

    int32_t mOrientation; // orientation for dpad keys

    Vector<KeyDown> mKeyDowns; // keys that are down
    int32_t mMetaState;
    nsecs_t mDownTime; // time of most recent key down

    int32_t mCurrentHidUsage; // most recent HID usage seen this packet, or 0 if none

    struct LedState {
        bool avail; // led is available
        bool on;    // we think the led is currently on
    };
    LedState mCapsLockLedState;
    LedState mNumLockLedState;
    LedState mScrollLockLedState;

    // Immutable configuration parameters.
    struct Parameters {
        bool hasAssociatedDisplay;
        bool orientationAware;
        bool handlesKeyRepeat;
    } mParameters;

    void configureParameters();
    void dumpParameters(String8& dump);

    bool isKeyboardOrGamepadKey(int32_t scanCode);

    void processKey(nsecs_t when, bool down, int32_t keyCode, int32_t scanCode,
            uint32_t policyFlags);

    ssize_t findKeyDown(int32_t scanCode);

    void resetLedState();
    void initializeLedState(LedState& ledState, int32_t led);
    void updateLedState(bool reset);
    void updateLedStateForModifier(LedState& ledState, int32_t led,
            int32_t modifier, bool reset);
};


class CursorInputMapper : public InputMapper {
public:
    CursorInputMapper(InputDevice* device);
    virtual ~CursorInputMapper();

    virtual uint32_t getSources();
    virtual void populateDeviceInfo(InputDeviceInfo* deviceInfo);
    virtual void dump(String8& dump);
    virtual void configure(nsecs_t when, const InputReaderConfiguration* config, uint32_t changes);
    virtual void reset(nsecs_t when);
    virtual void process(const RawEvent* rawEvent);

    virtual int32_t getScanCodeState(uint32_t sourceMask, int32_t scanCode);

    virtual void fadePointer();

private:
    // Amount that trackball needs to move in order to generate a key event.
    static const int32_t TRACKBALL_MOVEMENT_THRESHOLD = 6;

    // Immutable configuration parameters.
    struct Parameters {
        enum Mode {
            MODE_POINTER,
            MODE_NAVIGATION,
        };

        Mode mode;
        bool hasAssociatedDisplay;
        bool orientationAware;
    } mParameters;

    CursorButtonAccumulator mCursorButtonAccumulator;
    CursorMotionAccumulator mCursorMotionAccumulator;
    CursorScrollAccumulator mCursorScrollAccumulator;

    int32_t mSource;
    float mXScale;
    float mYScale;
    float mXPrecision;
    float mYPrecision;

    float mVWheelScale;
    float mHWheelScale;

    // Velocity controls for mouse pointer and wheel movements.
    // The controls for X and Y wheel movements are separate to keep them decoupled.
    VelocityControl mPointerVelocityControl;
    VelocityControl mWheelXVelocityControl;
    VelocityControl mWheelYVelocityControl;

    int32_t mOrientation;

    sp<PointerControllerInterface> mPointerController;

    int32_t mButtonState;
    nsecs_t mDownTime;

    void configureParameters();
    void dumpParameters(String8& dump);

    void sync(nsecs_t when);
};


class TouchInputMapper : public InputMapper {
public:
    TouchInputMapper(InputDevice* device);
    virtual ~TouchInputMapper();

    virtual uint32_t getSources();
    virtual void populateDeviceInfo(InputDeviceInfo* deviceInfo);
    virtual void dump(String8& dump);
    virtual void configure(nsecs_t when, const InputReaderConfiguration* config, uint32_t changes);
    virtual void reset(nsecs_t when);
    virtual void process(const RawEvent* rawEvent);

    virtual int32_t getKeyCodeState(uint32_t sourceMask, int32_t keyCode);
    virtual int32_t getScanCodeState(uint32_t sourceMask, int32_t scanCode);
    virtual bool markSupportedKeyCodes(uint32_t sourceMask, size_t numCodes,
            const int32_t* keyCodes, uint8_t* outFlags);

    virtual void fadePointer();
    virtual void cancelTouch(nsecs_t when);
    virtual void timeoutExpired(nsecs_t when);

protected:
    CursorButtonAccumulator mCursorButtonAccumulator;
    CursorScrollAccumulator mCursorScrollAccumulator;
    TouchButtonAccumulator mTouchButtonAccumulator;

    struct VirtualKey {
        int32_t keyCode;
        int32_t scanCode;
        uint32_t flags;

        // computed hit box, specified in touch screen coords based on known display size
        int32_t hitLeft;
        int32_t hitTop;
        int32_t hitRight;
        int32_t hitBottom;

        inline bool isHit(int32_t x, int32_t y) const {
            return x >= hitLeft && x <= hitRight && y >= hitTop && y <= hitBottom;
        }
    };

    // Input sources and device mode.
    uint32_t mSource;

    enum DeviceMode {
        DEVICE_MODE_DISABLED, // input is disabled
        DEVICE_MODE_DIRECT, // direct mapping (touchscreen)
        DEVICE_MODE_UNSCALED, // unscaled mapping (touchpad)
        DEVICE_MODE_NAVIGATION, // unscaled mapping with assist gesture (touch navigation)
        DEVICE_MODE_POINTER, // pointer mapping (pointer)
    };
    DeviceMode mDeviceMode;

    // The reader's configuration.
    InputReaderConfiguration mConfig;

    // Immutable configuration parameters.
    struct Parameters {
        enum DeviceType {
            DEVICE_TYPE_TOUCH_SCREEN,
            DEVICE_TYPE_TOUCH_PAD,
            DEVICE_TYPE_TOUCH_NAVIGATION,
            DEVICE_TYPE_POINTER,
        };

        DeviceType deviceType;
        bool hasAssociatedDisplay;
        bool associatedDisplayIsExternal;
        bool orientationAware;
        bool hasButtonUnderPad;

        enum GestureMode {
            GESTURE_MODE_POINTER,
            GESTURE_MODE_SPOTS,
        };
        GestureMode gestureMode;

        bool wake;
    } mParameters;

    // Immutable calibration parameters in parsed form.
    struct Calibration {
        // Size
        enum SizeCalibration {
            SIZE_CALIBRATION_DEFAULT,
            SIZE_CALIBRATION_NONE,
            SIZE_CALIBRATION_GEOMETRIC,
            SIZE_CALIBRATION_DIAMETER,
            SIZE_CALIBRATION_BOX,
            SIZE_CALIBRATION_AREA,
        };

        SizeCalibration sizeCalibration;

        bool haveSizeScale;
        float sizeScale;
        bool haveSizeBias;
        float sizeBias;
        bool haveSizeIsSummed;
        bool sizeIsSummed;

        // Pressure
        enum PressureCalibration {
            PRESSURE_CALIBRATION_DEFAULT,
            PRESSURE_CALIBRATION_NONE,
            PRESSURE_CALIBRATION_PHYSICAL,
            PRESSURE_CALIBRATION_AMPLITUDE,
        };

        PressureCalibration pressureCalibration;
        bool havePressureScale;
        float pressureScale;

        // Orientation
        enum OrientationCalibration {
            ORIENTATION_CALIBRATION_DEFAULT,
            ORIENTATION_CALIBRATION_NONE,
            ORIENTATION_CALIBRATION_INTERPOLATED,
            ORIENTATION_CALIBRATION_VECTOR,
        };

        OrientationCalibration orientationCalibration;

        // Distance
        enum DistanceCalibration {
            DISTANCE_CALIBRATION_DEFAULT,
            DISTANCE_CALIBRATION_NONE,
            DISTANCE_CALIBRATION_SCALED,
        };

        DistanceCalibration distanceCalibration;
        bool haveDistanceScale;
        float distanceScale;

        enum CoverageCalibration {
            COVERAGE_CALIBRATION_DEFAULT,
            COVERAGE_CALIBRATION_NONE,
            COVERAGE_CALIBRATION_BOX,
        };

        CoverageCalibration coverageCalibration;

        inline void applySizeScaleAndBias(float* outSize) const {
            if (haveSizeScale) {
                *outSize *= sizeScale;
            }
            if (haveSizeBias) {
                *outSize += sizeBias;
            }
            if (*outSize < 0) {
                *outSize = 0;
            }
        }
    } mCalibration;

    // Affine location transformation/calibration
    struct TouchAffineTransformation mAffineTransform;

    // Raw pointer axis information from the driver.
    RawPointerAxes mRawPointerAxes;

    // Raw pointer sample data.
    RawPointerData mCurrentRawPointerData;
    RawPointerData mLastRawPointerData;

    // Cooked pointer sample data.
    CookedPointerData mCurrentCookedPointerData;
    CookedPointerData mLastCookedPointerData;

    // Button state.
    int32_t mCurrentButtonState;
    int32_t mLastButtonState;

    // Scroll state.
    int32_t mCurrentRawVScroll;
    int32_t mCurrentRawHScroll;

    // Id bits used to differentiate fingers, stylus and mouse tools.
    BitSet32 mCurrentFingerIdBits; // finger or unknown
    BitSet32 mLastFingerIdBits;
    BitSet32 mCurrentStylusIdBits; // stylus or eraser
    BitSet32 mLastStylusIdBits;
    BitSet32 mCurrentMouseIdBits; // mouse or lens
    BitSet32 mLastMouseIdBits;

    // True if we sent a HOVER_ENTER event.
    bool mSentHoverEnter;

    // The time the primary pointer last went down.
    nsecs_t mDownTime;

    // The pointer controller, or null if the device is not a pointer.
    sp<PointerControllerInterface> mPointerController;

    Vector<VirtualKey> mVirtualKeys;

    virtual void configureParameters();
    virtual void dumpParameters(String8& dump);
    virtual void configureRawPointerAxes();
    virtual void dumpRawPointerAxes(String8& dump);
    virtual void configureSurface(nsecs_t when, bool* outResetNeeded);
    virtual void dumpSurface(String8& dump);
    virtual void configureVirtualKeys();
    virtual void dumpVirtualKeys(String8& dump);
    virtual void parseCalibration();
    virtual void resolveCalibration();
    virtual void dumpCalibration(String8& dump);
    virtual void dumpAffineTransformation(String8& dump);
    virtual bool hasStylus() const = 0;
    virtual void updateAffineTransformation();

    virtual void syncTouch(nsecs_t when, bool* outHavePointerIds) = 0;

private:
    // The current viewport.
    // The components of the viewport are specified in the display's rotated orientation.
    DisplayViewport mViewport;

    // The surface orientation, width and height set by configureSurface().
    // The width and height are derived from the viewport but are specified
    // in the natural orientation.
    // The surface origin specifies how the surface coordinates should be translated
    // to align with the logical display coordinate space.
    // The orientation may be different from the viewport orientation as it specifies
    // the rotation of the surface coordinates required to produce the viewport's
    // requested orientation, so it will depend on whether the device is orientation aware.
    int32_t mSurfaceWidth;
    int32_t mSurfaceHeight;
    int32_t mSurfaceLeft;
    int32_t mSurfaceTop;
    int32_t mSurfaceOrientation;

    // Translation and scaling factors, orientation-independent.
    float mXTranslate;
    float mXScale;
    float mXPrecision;

    float mYTranslate;
    float mYScale;
    float mYPrecision;

    float mGeometricScale;

    float mPressureScale;

    float mSizeScale;

    float mOrientationScale;

    float mDistanceScale;

    bool mHaveTilt;
    float mTiltXCenter;
    float mTiltXScale;
    float mTiltYCenter;
    float mTiltYScale;

    // Oriented motion ranges for input device info.
    struct OrientedRanges {
        InputDeviceInfo::MotionRange x;
        InputDeviceInfo::MotionRange y;
        InputDeviceInfo::MotionRange pressure;

        bool haveSize;
        InputDeviceInfo::MotionRange size;

        bool haveTouchSize;
        InputDeviceInfo::MotionRange touchMajor;
        InputDeviceInfo::MotionRange touchMinor;

        bool haveToolSize;
        InputDeviceInfo::MotionRange toolMajor;
        InputDeviceInfo::MotionRange toolMinor;

        bool haveOrientation;
        InputDeviceInfo::MotionRange orientation;

        bool haveDistance;
        InputDeviceInfo::MotionRange distance;

        bool haveTilt;
        InputDeviceInfo::MotionRange tilt;

        OrientedRanges() {
            clear();
        }

        void clear() {
            haveSize = false;
            haveTouchSize = false;
            haveToolSize = false;
            haveOrientation = false;
            haveDistance = false;
            haveTilt = false;
        }
    } mOrientedRanges;

    // Oriented dimensions and precision.
    float mOrientedXPrecision;
    float mOrientedYPrecision;

    struct CurrentVirtualKeyState {
        bool down;
        bool ignored;
        nsecs_t downTime;
        int32_t keyCode;
        int32_t scanCode;
    } mCurrentVirtualKey;

    // Scale factor for gesture or mouse based pointer movements.
    float mPointerXMovementScale;
    float mPointerYMovementScale;

    // Scale factor for gesture based zooming and other freeform motions.
    float mPointerXZoomScale;
    float mPointerYZoomScale;

    // The maximum swipe width.
    float mPointerGestureMaxSwipeWidth;

    struct PointerDistanceHeapElement {
        uint32_t currentPointerIndex : 8;
        uint32_t lastPointerIndex : 8;
        uint64_t distance : 48; // squared distance
    };

    enum PointerUsage {
        POINTER_USAGE_NONE,
        POINTER_USAGE_GESTURES,
        POINTER_USAGE_STYLUS,
        POINTER_USAGE_MOUSE,
    };
    PointerUsage mPointerUsage;

    struct PointerGesture {
        enum Mode {
            // No fingers, button is not pressed.
            // Nothing happening.
            NEUTRAL,

            // No fingers, button is not pressed.
            // Tap detected.
            // Emits DOWN and UP events at the pointer location.
            TAP,

            // Exactly one finger dragging following a tap.
            // Pointer follows the active finger.
            // Emits DOWN, MOVE and UP events at the pointer location.
            //
            // Detect double-taps when the finger goes up while in TAP_DRAG mode.
            TAP_DRAG,

            // Button is pressed.
            // Pointer follows the active finger if there is one.  Other fingers are ignored.
            // Emits DOWN, MOVE and UP events at the pointer location.
            BUTTON_CLICK_OR_DRAG,

            // Exactly one finger, button is not pressed.
            // Pointer follows the active finger.
            // Emits HOVER_MOVE events at the pointer location.
            //
            // Detect taps when the finger goes up while in HOVER mode.
            HOVER,

            // Exactly two fingers but neither have moved enough to clearly indicate
            // whether a swipe or freeform gesture was intended.  We consider the
            // pointer to be pressed so this enables clicking or long-pressing on buttons.
            // Pointer does not move.
            // Emits DOWN, MOVE and UP events with a single stationary pointer coordinate.
            PRESS,

            // Exactly two fingers moving in the same direction, button is not pressed.
            // Pointer does not move.
            // Emits DOWN, MOVE and UP events with a single pointer coordinate that
            // follows the midpoint between both fingers.
            SWIPE,

            // Two or more fingers moving in arbitrary directions, button is not pressed.
            // Pointer does not move.
            // Emits DOWN, POINTER_DOWN, MOVE, POINTER_UP and UP events that follow
            // each finger individually relative to the initial centroid of the finger.
            FREEFORM,

            // Waiting for quiet time to end before starting the next gesture.
            QUIET,
        };

        // Time the first finger went down.
        nsecs_t firstTouchTime;

        // The active pointer id from the raw touch data.
        int32_t activeTouchId; // -1 if none

        // The active pointer id from the gesture last delivered to the application.
        int32_t activeGestureId; // -1 if none

        // Pointer coords and ids for the current and previous pointer gesture.
        Mode currentGestureMode;
        BitSet32 currentGestureIdBits;
        uint32_t currentGestureIdToIndex[MAX_POINTER_ID + 1];
        PointerProperties currentGestureProperties[MAX_POINTERS];
        PointerCoords currentGestureCoords[MAX_POINTERS];

        Mode lastGestureMode;
        BitSet32 lastGestureIdBits;
        uint32_t lastGestureIdToIndex[MAX_POINTER_ID + 1];
        PointerProperties lastGestureProperties[MAX_POINTERS];
        PointerCoords lastGestureCoords[MAX_POINTERS];

        // Time the pointer gesture last went down.
        nsecs_t downTime;

        // Time when the pointer went down for a TAP.
        nsecs_t tapDownTime;

        // Time when the pointer went up for a TAP.
        nsecs_t tapUpTime;

        // Location of initial tap.
        float tapX, tapY;

        // Time we started waiting for quiescence.
        nsecs_t quietTime;

        // Reference points for multitouch gestures.
        float referenceTouchX;    // reference touch X/Y coordinates in surface units
        float referenceTouchY;
        float referenceGestureX;  // reference gesture X/Y coordinates in pixels
        float referenceGestureY;

        // Distance that each pointer has traveled which has not yet been
        // subsumed into the reference gesture position.
        BitSet32 referenceIdBits;
        struct Delta {
            float dx, dy;
        };
        Delta referenceDeltas[MAX_POINTER_ID + 1];

        // Describes how touch ids are mapped to gesture ids for freeform gestures.
        uint32_t freeformTouchToGestureIdMap[MAX_POINTER_ID + 1];

        // A velocity tracker for determining whether to switch active pointers during drags.
        VelocityTracker velocityTracker;

        void reset() {
            firstTouchTime = LLONG_MIN;
            activeTouchId = -1;
            activeGestureId = -1;
            currentGestureMode = NEUTRAL;
            currentGestureIdBits.clear();
            lastGestureMode = NEUTRAL;
            lastGestureIdBits.clear();
            downTime = 0;
            velocityTracker.clear();
            resetTap();
            resetQuietTime();
        }

        void resetTap() {
            tapDownTime = LLONG_MIN;
            tapUpTime = LLONG_MIN;
        }

        void resetQuietTime() {
            quietTime = LLONG_MIN;
        }
    } mPointerGesture;

    struct PointerSimple {
        PointerCoords currentCoords;
        PointerProperties currentProperties;
        PointerCoords lastCoords;
        PointerProperties lastProperties;

        // True if the pointer is down.
        bool down;

        // True if the pointer is hovering.
        bool hovering;

        // Time the pointer last went down.
        nsecs_t downTime;

        void reset() {
            currentCoords.clear();
            currentProperties.clear();
            lastCoords.clear();
            lastProperties.clear();
            down = false;
            hovering = false;
            downTime = 0;
        }
    } mPointerSimple;

    // The pointer and scroll velocity controls.
    VelocityControl mPointerVelocityControl;
    VelocityControl mWheelXVelocityControl;
    VelocityControl mWheelYVelocityControl;

    void sync(nsecs_t when);

    bool consumeRawTouches(nsecs_t when, uint32_t policyFlags);
    void dispatchVirtualKey(nsecs_t when, uint32_t policyFlags,
            int32_t keyEventAction, int32_t keyEventFlags);

    void dispatchTouches(nsecs_t when, uint32_t policyFlags);
    void dispatchHoverExit(nsecs_t when, uint32_t policyFlags);
    void dispatchHoverEnterAndMove(nsecs_t when, uint32_t policyFlags);
    void cookPointerData();

    void dispatchPointerUsage(nsecs_t when, uint32_t policyFlags, PointerUsage pointerUsage);
    void abortPointerUsage(nsecs_t when, uint32_t policyFlags);

    void dispatchPointerGestures(nsecs_t when, uint32_t policyFlags, bool isTimeout);
    void abortPointerGestures(nsecs_t when, uint32_t policyFlags);
    bool preparePointerGestures(nsecs_t when,
            bool* outCancelPreviousGesture, bool* outFinishPreviousGesture,
            bool isTimeout);

    void dispatchPointerStylus(nsecs_t when, uint32_t policyFlags);
    void abortPointerStylus(nsecs_t when, uint32_t policyFlags);

    void dispatchPointerMouse(nsecs_t when, uint32_t policyFlags);
    void abortPointerMouse(nsecs_t when, uint32_t policyFlags);

    void dispatchPointerSimple(nsecs_t when, uint32_t policyFlags,
            bool down, bool hovering);
    void abortPointerSimple(nsecs_t when, uint32_t policyFlags);

    // Dispatches a motion event.
    // If the changedId is >= 0 and the action is POINTER_DOWN or POINTER_UP, the
    // method will take care of setting the index and transmuting the action to DOWN or UP
    // it is the first / last pointer to go down / up.
    void dispatchMotion(nsecs_t when, uint32_t policyFlags, uint32_t source,
            int32_t action, int32_t flags, int32_t metaState, int32_t buttonState,
            int32_t edgeFlags,
            const PointerProperties* properties, const PointerCoords* coords,
            const uint32_t* idToIndex, BitSet32 idBits,
            int32_t changedId, float xPrecision, float yPrecision, nsecs_t downTime);

    // Updates pointer coords and properties for pointers with specified ids that have moved.
    // Returns true if any of them changed.
    bool updateMovedPointers(const PointerProperties* inProperties,
            const PointerCoords* inCoords, const uint32_t* inIdToIndex,
            PointerProperties* outProperties, PointerCoords* outCoords,
            const uint32_t* outIdToIndex, BitSet32 idBits) const;

    bool isPointInsideSurface(int32_t x, int32_t y);
    const VirtualKey* findVirtualKeyHit(int32_t x, int32_t y);

    void assignPointerIds();
};


class SingleTouchInputMapper : public TouchInputMapper {
public:
    SingleTouchInputMapper(InputDevice* device);
    virtual ~SingleTouchInputMapper();

    virtual void reset(nsecs_t when);
    virtual void process(const RawEvent* rawEvent);

protected:
    virtual void syncTouch(nsecs_t when, bool* outHavePointerIds);
    virtual void configureRawPointerAxes();
    virtual bool hasStylus() const;

private:
    SingleTouchMotionAccumulator mSingleTouchMotionAccumulator;
};


class MultiTouchInputMapper : public TouchInputMapper {
public:
    MultiTouchInputMapper(InputDevice* device);
    virtual ~MultiTouchInputMapper();

    virtual void reset(nsecs_t when);
    virtual void process(const RawEvent* rawEvent);

protected:
    virtual void syncTouch(nsecs_t when, bool* outHavePointerIds);
    virtual void configureRawPointerAxes();
    virtual bool hasStylus() const;

private:
    MultiTouchMotionAccumulator mMultiTouchMotionAccumulator;

    // Specifies the pointer id bits that are in use, and their associated tracking id.
    BitSet32 mPointerIdBits;
    int32_t mPointerTrackingIdMap[MAX_POINTER_ID + 1];
};


class JoystickInputMapper : public InputMapper {
public:
    JoystickInputMapper(InputDevice* device);
    virtual ~JoystickInputMapper();

    virtual uint32_t getSources();
    virtual void populateDeviceInfo(InputDeviceInfo* deviceInfo);
    virtual void dump(String8& dump);
    virtual void configure(nsecs_t when, const InputReaderConfiguration* config, uint32_t changes);
    virtual void reset(nsecs_t when);
    virtual void process(const RawEvent* rawEvent);

private:
    struct Axis {
        RawAbsoluteAxisInfo rawAxisInfo;
        AxisInfo axisInfo;

        bool explicitlyMapped; // true if the axis was explicitly assigned an axis id

        float scale;   // scale factor from raw to normalized values
        float offset;  // offset to add after scaling for normalization
        float highScale;  // scale factor from raw to normalized values of high split
        float highOffset; // offset to add after scaling for normalization of high split

        float min;        // normalized inclusive minimum
        float max;        // normalized inclusive maximum
        float flat;       // normalized flat region size
        float fuzz;       // normalized error tolerance
        float resolution; // normalized resolution in units/mm

        float filter;  // filter out small variations of this size
        float currentValue; // current value
        float newValue; // most recent value
        float highCurrentValue; // current value of high split
        float highNewValue; // most recent value of high split

        void initialize(const RawAbsoluteAxisInfo& rawAxisInfo, const AxisInfo& axisInfo,
                bool explicitlyMapped, float scale, float offset,
                float highScale, float highOffset,
                float min, float max, float flat, float fuzz, float resolution) {
            this->rawAxisInfo = rawAxisInfo;
            this->axisInfo = axisInfo;
            this->explicitlyMapped = explicitlyMapped;
            this->scale = scale;
            this->offset = offset;
            this->highScale = highScale;
            this->highOffset = highOffset;
            this->min = min;
            this->max = max;
            this->flat = flat;
            this->fuzz = fuzz;
            this->resolution = resolution;
            this->filter = 0;
            resetValue();
        }

        void resetValue() {
            this->currentValue = 0;
            this->newValue = 0;
            this->highCurrentValue = 0;
            this->highNewValue = 0;
        }
    };

    // Axes indexed by raw ABS_* axis index.
    KeyedVector<int32_t, Axis> mAxes;

    void sync(nsecs_t when, bool force);

    bool haveAxis(int32_t axisId);
    void pruneAxes(bool ignoreExplicitlyMappedAxes);
    bool filterAxes(bool force);

    static bool hasValueChangedSignificantly(float filter,
            float newValue, float currentValue, float min, float max);
    static bool hasMovedNearerToValueWithinFilteredRange(float filter,
            float newValue, float currentValue, float thresholdValue);

    static bool isCenteredAxis(int32_t axis);
    static int32_t getCompatAxis(int32_t axis);

    static void addMotionRange(int32_t axisId, const Axis& axis, InputDeviceInfo* info);
    static void setPointerCoordsAxisValue(PointerCoords* pointerCoords, int32_t axis,
            float value);
};

} // namespace android

#endif // _UI_INPUT_READER_H