1 /*
2 * Copyright (C) 2022 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <input/DisplayViewport.h>
18 #include <stdint.h>
19 #include <ui/Rotation.h>
20
21 #include "EventHub.h"
22 #include "InputListener.h"
23 #include "InputReaderContext.h"
24
25 namespace android {
26
27 namespace {
28
synthesizeButtonKey(InputReaderContext * context,int32_t action,nsecs_t when,nsecs_t readTime,int32_t deviceId,uint32_t source,ui::LogicalDisplayId displayId,uint32_t policyFlags,int32_t lastButtonState,int32_t currentButtonState,int32_t buttonState,int32_t keyCode)29 [[nodiscard]] std::list<NotifyArgs> synthesizeButtonKey(
30 InputReaderContext* context, int32_t action, nsecs_t when, nsecs_t readTime,
31 int32_t deviceId, uint32_t source, ui::LogicalDisplayId displayId, uint32_t policyFlags,
32 int32_t lastButtonState, int32_t currentButtonState, int32_t buttonState, int32_t keyCode) {
33 std::list<NotifyArgs> out;
34 if ((action == AKEY_EVENT_ACTION_DOWN && !(lastButtonState & buttonState) &&
35 (currentButtonState & buttonState)) ||
36 (action == AKEY_EVENT_ACTION_UP && (lastButtonState & buttonState) &&
37 !(currentButtonState & buttonState))) {
38 out.push_back(NotifyKeyArgs(context->getNextId(), when, readTime, deviceId, source,
39 displayId, policyFlags, action, 0, keyCode, 0,
40 context->getGlobalMetaState(), when));
41 }
42 return out;
43 }
44
45 } // namespace
46
getInverseRotation(ui::Rotation orientation)47 ui::Rotation getInverseRotation(ui::Rotation orientation) {
48 switch (orientation) {
49 case ui::ROTATION_90:
50 return ui::ROTATION_270;
51 case ui::ROTATION_270:
52 return ui::ROTATION_90;
53 default:
54 return orientation;
55 }
56 }
57
rotateDelta(ui::Rotation orientation,float * deltaX,float * deltaY)58 void rotateDelta(ui::Rotation orientation, float* deltaX, float* deltaY) {
59 float temp;
60 switch (orientation) {
61 case ui::ROTATION_90:
62 temp = *deltaX;
63 *deltaX = *deltaY;
64 *deltaY = -temp;
65 break;
66
67 case ui::ROTATION_180:
68 *deltaX = -*deltaX;
69 *deltaY = -*deltaY;
70 break;
71
72 case ui::ROTATION_270:
73 temp = *deltaX;
74 *deltaX = -*deltaY;
75 *deltaY = temp;
76 break;
77
78 default:
79 break;
80 }
81 }
82
isPointerDown(int32_t buttonState)83 bool isPointerDown(int32_t buttonState) {
84 return buttonState &
85 (AMOTION_EVENT_BUTTON_PRIMARY | AMOTION_EVENT_BUTTON_SECONDARY |
86 AMOTION_EVENT_BUTTON_TERTIARY);
87 }
88
synthesizeButtonKeys(InputReaderContext * context,int32_t action,nsecs_t when,nsecs_t readTime,int32_t deviceId,uint32_t source,ui::LogicalDisplayId displayId,uint32_t policyFlags,int32_t lastButtonState,int32_t currentButtonState)89 [[nodiscard]] std::list<NotifyArgs> synthesizeButtonKeys(
90 InputReaderContext* context, int32_t action, nsecs_t when, nsecs_t readTime,
91 int32_t deviceId, uint32_t source, ui::LogicalDisplayId displayId, uint32_t policyFlags,
92 int32_t lastButtonState, int32_t currentButtonState) {
93 std::list<NotifyArgs> out;
94 out += synthesizeButtonKey(context, action, when, readTime, deviceId, source, displayId,
95 policyFlags, lastButtonState, currentButtonState,
96 AMOTION_EVENT_BUTTON_BACK, AKEYCODE_BACK);
97 out += synthesizeButtonKey(context, action, when, readTime, deviceId, source, displayId,
98 policyFlags, lastButtonState, currentButtonState,
99 AMOTION_EVENT_BUTTON_FORWARD, AKEYCODE_FORWARD);
100 return out;
101 }
102
applyBluetoothTimestampSmoothening(const InputDeviceIdentifier & identifier,nsecs_t currentEventTime,nsecs_t readTime,nsecs_t lastEventTime)103 std::tuple<nsecs_t /*eventTime*/, nsecs_t /*readTime*/> applyBluetoothTimestampSmoothening(
104 const InputDeviceIdentifier& identifier, nsecs_t currentEventTime, nsecs_t readTime,
105 nsecs_t lastEventTime) {
106 if (identifier.bus != BUS_BLUETOOTH) {
107 return {currentEventTime, readTime};
108 }
109
110 // Assume the fastest rate at which a Bluetooth touch device can report input events is one
111 // every 4 milliseconds, or 250 Hz. Timestamps for successive events from a Bluetooth device
112 // will be separated by at least this amount.
113 constexpr static nsecs_t MIN_BLUETOOTH_TIMESTAMP_DELTA = ms2ns(4);
114 // We define a maximum smoothing time delta so that we don't generate events too far into the
115 // future.
116 constexpr static nsecs_t MAX_BLUETOOTH_SMOOTHING_DELTA = ms2ns(32);
117 const nsecs_t smoothenedEventTime =
118 std::min(std::max(currentEventTime, lastEventTime + MIN_BLUETOOTH_TIMESTAMP_DELTA),
119 currentEventTime + MAX_BLUETOOTH_SMOOTHING_DELTA);
120 // If we are modifying the event time, treat this event as a synthetically generated event for
121 // latency tracking purposes and use the event time as the read time (zero read latency).
122 const nsecs_t smoothenedReadTime =
123 smoothenedEventTime != currentEventTime ? currentEventTime : readTime;
124 return {smoothenedEventTime, smoothenedReadTime};
125 }
126
127 } // namespace android
128