1 /*
2  * Copyright (C) 2019 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 #pragma once
18 
19 #include "TouchInputMapper.h"
20 #include "accumulator/MultiTouchMotionAccumulator.h"
21 
22 namespace android {
23 
24 class MultiTouchInputMapper : public TouchInputMapper {
25 public:
26     template <class T, class... Args>
27     friend std::unique_ptr<T> createInputMapper(InputDeviceContext& deviceContext,
28                                                 const InputReaderConfiguration& readerConfig,
29                                                 Args... args);
30 
31     ~MultiTouchInputMapper() override;
32 
33     [[nodiscard]] std::list<NotifyArgs> reset(nsecs_t when) override;
34     [[nodiscard]] std::list<NotifyArgs> process(const RawEvent& rawEvent) override;
35     [[nodiscard]] std::list<NotifyArgs> reconfigure(nsecs_t when,
36                                                     const InputReaderConfiguration& config,
37                                                     ConfigurationChanges changes) override;
38 
39 protected:
40     void syncTouch(nsecs_t when, RawState* outState) override;
41     void configureRawPointerAxes() override;
42     bool hasStylus() const override;
43 
44 private:
45     explicit MultiTouchInputMapper(InputDeviceContext& deviceContext,
46                                    const InputReaderConfiguration& readerConfig);
47 
48     // If the slot is in use, return the bit id. Return std::nullopt otherwise.
49     std::optional<int32_t> getActiveBitId(const MultiTouchMotionAccumulator::Slot& inSlot);
50     MultiTouchMotionAccumulator mMultiTouchMotionAccumulator;
51 
52     // Specifies the pointer id bits that are in use, and their associated tracking id.
53     BitSet32 mPointerIdBits;
54     int32_t mPointerTrackingIdMap[MAX_POINTER_ID + 1];
55 
56     bool mStylusMtToolSeen{false};
57 
58     // simulate_stylus_with_touch is a debug mode that converts all finger pointers reported by this
59     // mapper's touchscreen into stylus pointers, and adds SOURCE_STYLUS to the input device.
60     // It is used to simulate stylus events for debugging and testing on a device that does not
61     // support styluses. It can be enabled using
62     // "adb shell setprop debug.input.simulate_stylus_with_touch true".
63     // After enabling, the touchscreen will need to be reconfigured. A reconfiguration usually
64     // happens when turning the screen on/off or by rotating the device orientation.
65     bool mShouldSimulateStylusWithTouch{false};
66 };
67 
68 } // namespace android
69