c5982b7bee
Replaced VelocityTracker with a faster and more accurate native implementation. This avoids the duplicate maintenance overhead of having two implementations. The new algorithm requires that the sample duration be at least 10ms in order to contribute to the velocity calculation. This ensures that the velocity is not severely overestimated when samples arrive in bursts. The new algorithm computes the exponentially weighted moving average using weights based on the relative duration of successive sample periods. The new algorithm is also more careful about how it handles individual pointers going down or up and their effects on the collected movement traces. The intent is to preserve the last known velocity of pointers as they go up while also ensuring that other motion samples do not count twice in that case. Bug: 4086785 Change-Id: I95054102397c4b6a9076dc6a0fc841b4beec7920
724 lines
21 KiB
C++
724 lines
21 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _UI_INPUT_H
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#define _UI_INPUT_H
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/**
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* Native input event structures.
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*/
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#include <android/input.h>
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#include <utils/Vector.h>
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#include <utils/KeyedVector.h>
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#include <utils/Timers.h>
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#include <utils/RefBase.h>
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#include <utils/String8.h>
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#include <utils/BitSet.h>
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#ifdef HAVE_ANDROID_OS
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class SkMatrix;
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#endif
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/*
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* Additional private constants not defined in ndk/ui/input.h.
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*/
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enum {
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/*
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* Private control to determine when an app is tracking a key sequence.
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*/
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AKEY_EVENT_FLAG_START_TRACKING = 0x40000000
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};
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enum {
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/*
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* Indicates that an input device has switches.
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* This input source flag is hidden from the API because switches are only used by the system
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* and applications have no way to interact with them.
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*/
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AINPUT_SOURCE_SWITCH = 0x80000000,
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};
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/*
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* SystemUiVisibility constants from View.
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*/
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enum {
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ASYSTEM_UI_VISIBILITY_STATUS_BAR_VISIBLE = 0,
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ASYSTEM_UI_VISIBILITY_STATUS_BAR_HIDDEN = 0x00000001,
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};
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/*
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* Maximum number of pointers supported per motion event.
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* Smallest number of pointers is 1.
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* (We want at least 10 but some touch controllers obstensibly configured for 10 pointers
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* will occasionally emit 11. There is not much harm making this constant bigger.)
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*/
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#define MAX_POINTERS 16
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/*
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* Maximum pointer id value supported in a motion event.
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* Smallest pointer id is 0.
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* (This is limited by our use of BitSet32 to track pointer assignments.)
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*/
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#define MAX_POINTER_ID 31
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/*
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* Declare a concrete type for the NDK's input event forward declaration.
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*/
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struct AInputEvent {
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virtual ~AInputEvent() { }
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};
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/*
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* Declare a concrete type for the NDK's input device forward declaration.
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*/
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struct AInputDevice {
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virtual ~AInputDevice() { }
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};
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namespace android {
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#ifdef HAVE_ANDROID_OS
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class Parcel;
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#endif
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/*
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* Flags that flow alongside events in the input dispatch system to help with certain
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* policy decisions such as waking from device sleep.
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*
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* These flags are also defined in frameworks/base/core/java/android/view/WindowManagerPolicy.java.
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*/
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enum {
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/* These flags originate in RawEvents and are generally set in the key map.
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* NOTE: If you edit these flags, also edit labels in KeycodeLabels.h. */
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POLICY_FLAG_WAKE = 0x00000001,
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POLICY_FLAG_WAKE_DROPPED = 0x00000002,
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POLICY_FLAG_SHIFT = 0x00000004,
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POLICY_FLAG_CAPS_LOCK = 0x00000008,
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POLICY_FLAG_ALT = 0x00000010,
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POLICY_FLAG_ALT_GR = 0x00000020,
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POLICY_FLAG_MENU = 0x00000040,
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POLICY_FLAG_LAUNCHER = 0x00000080,
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POLICY_FLAG_VIRTUAL = 0x00000100,
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POLICY_FLAG_FUNCTION = 0x00000200,
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POLICY_FLAG_RAW_MASK = 0x0000ffff,
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/* These flags are set by the input dispatcher. */
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// Indicates that the input event was injected.
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POLICY_FLAG_INJECTED = 0x01000000,
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// Indicates that the input event is from a trusted source such as a directly attached
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// input device or an application with system-wide event injection permission.
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POLICY_FLAG_TRUSTED = 0x02000000,
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/* These flags are set by the input reader policy as it intercepts each event. */
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// Indicates that the screen was off when the event was received and the event
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// should wake the device.
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POLICY_FLAG_WOKE_HERE = 0x10000000,
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// Indicates that the screen was dim when the event was received and the event
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// should brighten the device.
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POLICY_FLAG_BRIGHT_HERE = 0x20000000,
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// Indicates that the event should be dispatched to applications.
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// The input event should still be sent to the InputDispatcher so that it can see all
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// input events received include those that it will not deliver.
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POLICY_FLAG_PASS_TO_USER = 0x40000000,
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};
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/*
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* Button state.
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*/
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enum {
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// Primary button pressed (left mouse button).
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BUTTON_STATE_PRIMARY = 1 << 0,
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};
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/*
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* Describes the basic configuration of input devices that are present.
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*/
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struct InputConfiguration {
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enum {
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TOUCHSCREEN_UNDEFINED = 0,
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TOUCHSCREEN_NOTOUCH = 1,
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TOUCHSCREEN_STYLUS = 2,
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TOUCHSCREEN_FINGER = 3
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};
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enum {
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KEYBOARD_UNDEFINED = 0,
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KEYBOARD_NOKEYS = 1,
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KEYBOARD_QWERTY = 2,
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KEYBOARD_12KEY = 3
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};
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enum {
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NAVIGATION_UNDEFINED = 0,
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NAVIGATION_NONAV = 1,
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NAVIGATION_DPAD = 2,
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NAVIGATION_TRACKBALL = 3,
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NAVIGATION_WHEEL = 4
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};
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int32_t touchScreen;
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int32_t keyboard;
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int32_t navigation;
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};
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/*
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* Pointer coordinate data.
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*/
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struct PointerCoords {
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enum { MAX_AXES = 14 }; // 14 so that sizeof(PointerCoords) == 64
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// Bitfield of axes that are present in this structure.
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uint64_t bits;
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// Values of axes that are stored in this structure packed in order by axis id
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// for each axis that is present in the structure according to 'bits'.
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float values[MAX_AXES];
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inline void clear() {
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bits = 0;
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}
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float getAxisValue(int32_t axis) const;
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status_t setAxisValue(int32_t axis, float value);
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float* editAxisValue(int32_t axis);
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void scale(float scale);
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#ifdef HAVE_ANDROID_OS
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status_t readFromParcel(Parcel* parcel);
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status_t writeToParcel(Parcel* parcel) const;
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#endif
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bool operator==(const PointerCoords& other) const;
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inline bool operator!=(const PointerCoords& other) const {
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return !(*this == other);
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}
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void copyFrom(const PointerCoords& other);
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private:
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void tooManyAxes(int axis);
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};
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/*
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* Input events.
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*/
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class InputEvent : public AInputEvent {
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public:
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virtual ~InputEvent() { }
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virtual int32_t getType() const = 0;
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inline int32_t getDeviceId() const { return mDeviceId; }
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inline int32_t getSource() const { return mSource; }
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inline void setSource(int32_t source) { mSource = source; }
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protected:
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void initialize(int32_t deviceId, int32_t source);
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void initialize(const InputEvent& from);
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int32_t mDeviceId;
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int32_t mSource;
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};
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/*
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* Key events.
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*/
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class KeyEvent : public InputEvent {
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public:
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virtual ~KeyEvent() { }
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virtual int32_t getType() const { return AINPUT_EVENT_TYPE_KEY; }
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inline int32_t getAction() const { return mAction; }
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inline int32_t getFlags() const { return mFlags; }
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inline int32_t getKeyCode() const { return mKeyCode; }
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inline int32_t getScanCode() const { return mScanCode; }
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inline int32_t getMetaState() const { return mMetaState; }
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inline int32_t getRepeatCount() const { return mRepeatCount; }
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inline nsecs_t getDownTime() const { return mDownTime; }
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inline nsecs_t getEventTime() const { return mEventTime; }
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// Return true if this event may have a default action implementation.
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static bool hasDefaultAction(int32_t keyCode);
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bool hasDefaultAction() const;
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// Return true if this event represents a system key.
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static bool isSystemKey(int32_t keyCode);
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bool isSystemKey() const;
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void initialize(
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int32_t deviceId,
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int32_t source,
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int32_t action,
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int32_t flags,
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int32_t keyCode,
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int32_t scanCode,
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int32_t metaState,
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int32_t repeatCount,
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nsecs_t downTime,
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nsecs_t eventTime);
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void initialize(const KeyEvent& from);
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protected:
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int32_t mAction;
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int32_t mFlags;
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int32_t mKeyCode;
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int32_t mScanCode;
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int32_t mMetaState;
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int32_t mRepeatCount;
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nsecs_t mDownTime;
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nsecs_t mEventTime;
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};
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/*
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* Motion events.
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*/
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class MotionEvent : public InputEvent {
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public:
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virtual ~MotionEvent() { }
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virtual int32_t getType() const { return AINPUT_EVENT_TYPE_MOTION; }
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inline int32_t getAction() const { return mAction; }
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inline int32_t getActionMasked() const { return mAction & AMOTION_EVENT_ACTION_MASK; }
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inline int32_t getActionIndex() const {
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return (mAction & AMOTION_EVENT_ACTION_POINTER_INDEX_MASK)
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>> AMOTION_EVENT_ACTION_POINTER_INDEX_SHIFT;
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}
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inline void setAction(int32_t action) { mAction = action; }
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inline int32_t getFlags() const { return mFlags; }
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inline int32_t getEdgeFlags() const { return mEdgeFlags; }
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inline void setEdgeFlags(int32_t edgeFlags) { mEdgeFlags = edgeFlags; }
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inline int32_t getMetaState() const { return mMetaState; }
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inline void setMetaState(int32_t metaState) { mMetaState = metaState; }
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inline float getXOffset() const { return mXOffset; }
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inline float getYOffset() const { return mYOffset; }
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inline float getXPrecision() const { return mXPrecision; }
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inline float getYPrecision() const { return mYPrecision; }
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inline nsecs_t getDownTime() const { return mDownTime; }
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inline size_t getPointerCount() const { return mPointerIds.size(); }
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inline int32_t getPointerId(size_t pointerIndex) const { return mPointerIds[pointerIndex]; }
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inline nsecs_t getEventTime() const { return mSampleEventTimes[getHistorySize()]; }
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const PointerCoords* getRawPointerCoords(size_t pointerIndex) const;
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float getRawAxisValue(int32_t axis, size_t pointerIndex) const;
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inline float getRawX(size_t pointerIndex) const {
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return getRawAxisValue(AMOTION_EVENT_AXIS_X, pointerIndex);
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}
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inline float getRawY(size_t pointerIndex) const {
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return getRawAxisValue(AMOTION_EVENT_AXIS_Y, pointerIndex);
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}
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float getAxisValue(int32_t axis, size_t pointerIndex) const;
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inline float getX(size_t pointerIndex) const {
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return getAxisValue(AMOTION_EVENT_AXIS_X, pointerIndex);
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}
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inline float getY(size_t pointerIndex) const {
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return getAxisValue(AMOTION_EVENT_AXIS_Y, pointerIndex);
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}
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inline float getPressure(size_t pointerIndex) const {
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return getAxisValue(AMOTION_EVENT_AXIS_PRESSURE, pointerIndex);
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}
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inline float getSize(size_t pointerIndex) const {
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return getAxisValue(AMOTION_EVENT_AXIS_SIZE, pointerIndex);
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}
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inline float getTouchMajor(size_t pointerIndex) const {
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return getAxisValue(AMOTION_EVENT_AXIS_TOUCH_MAJOR, pointerIndex);
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}
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inline float getTouchMinor(size_t pointerIndex) const {
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return getAxisValue(AMOTION_EVENT_AXIS_TOUCH_MINOR, pointerIndex);
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}
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inline float getToolMajor(size_t pointerIndex) const {
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return getAxisValue(AMOTION_EVENT_AXIS_TOOL_MAJOR, pointerIndex);
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}
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inline float getToolMinor(size_t pointerIndex) const {
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return getAxisValue(AMOTION_EVENT_AXIS_TOOL_MINOR, pointerIndex);
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}
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inline float getOrientation(size_t pointerIndex) const {
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return getAxisValue(AMOTION_EVENT_AXIS_ORIENTATION, pointerIndex);
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}
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inline size_t getHistorySize() const { return mSampleEventTimes.size() - 1; }
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inline nsecs_t getHistoricalEventTime(size_t historicalIndex) const {
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return mSampleEventTimes[historicalIndex];
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}
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const PointerCoords* getHistoricalRawPointerCoords(
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size_t pointerIndex, size_t historicalIndex) const;
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float getHistoricalRawAxisValue(int32_t axis, size_t pointerIndex,
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size_t historicalIndex) const;
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inline float getHistoricalRawX(size_t pointerIndex, size_t historicalIndex) const {
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return getHistoricalRawAxisValue(
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AMOTION_EVENT_AXIS_X, pointerIndex, historicalIndex);
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}
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inline float getHistoricalRawY(size_t pointerIndex, size_t historicalIndex) const {
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return getHistoricalRawAxisValue(
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AMOTION_EVENT_AXIS_Y, pointerIndex, historicalIndex);
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}
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float getHistoricalAxisValue(int32_t axis, size_t pointerIndex, size_t historicalIndex) const;
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inline float getHistoricalX(size_t pointerIndex, size_t historicalIndex) const {
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return getHistoricalAxisValue(
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AMOTION_EVENT_AXIS_X, pointerIndex, historicalIndex);
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}
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inline float getHistoricalY(size_t pointerIndex, size_t historicalIndex) const {
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return getHistoricalAxisValue(
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AMOTION_EVENT_AXIS_Y, pointerIndex, historicalIndex);
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}
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inline float getHistoricalPressure(size_t pointerIndex, size_t historicalIndex) const {
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return getHistoricalAxisValue(
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AMOTION_EVENT_AXIS_PRESSURE, pointerIndex, historicalIndex);
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}
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inline float getHistoricalSize(size_t pointerIndex, size_t historicalIndex) const {
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return getHistoricalAxisValue(
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AMOTION_EVENT_AXIS_SIZE, pointerIndex, historicalIndex);
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}
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inline float getHistoricalTouchMajor(size_t pointerIndex, size_t historicalIndex) const {
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return getHistoricalAxisValue(
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AMOTION_EVENT_AXIS_TOUCH_MAJOR, pointerIndex, historicalIndex);
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}
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inline float getHistoricalTouchMinor(size_t pointerIndex, size_t historicalIndex) const {
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return getHistoricalAxisValue(
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AMOTION_EVENT_AXIS_TOUCH_MINOR, pointerIndex, historicalIndex);
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}
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inline float getHistoricalToolMajor(size_t pointerIndex, size_t historicalIndex) const {
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return getHistoricalAxisValue(
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AMOTION_EVENT_AXIS_TOOL_MAJOR, pointerIndex, historicalIndex);
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}
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|
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inline float getHistoricalToolMinor(size_t pointerIndex, size_t historicalIndex) const {
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return getHistoricalAxisValue(
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AMOTION_EVENT_AXIS_TOOL_MINOR, pointerIndex, historicalIndex);
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}
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|
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inline float getHistoricalOrientation(size_t pointerIndex, size_t historicalIndex) const {
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return getHistoricalAxisValue(
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AMOTION_EVENT_AXIS_ORIENTATION, pointerIndex, historicalIndex);
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}
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|
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ssize_t findPointerIndex(int32_t pointerId) const;
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|
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void initialize(
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int32_t deviceId,
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int32_t source,
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int32_t action,
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int32_t flags,
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int32_t edgeFlags,
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int32_t metaState,
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float xOffset,
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float yOffset,
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float xPrecision,
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float yPrecision,
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nsecs_t downTime,
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nsecs_t eventTime,
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size_t pointerCount,
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const int32_t* pointerIds,
|
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const PointerCoords* pointerCoords);
|
|
|
|
void copyFrom(const MotionEvent* other, bool keepHistory);
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|
|
|
void addSample(
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nsecs_t eventTime,
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const PointerCoords* pointerCoords);
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|
|
|
void offsetLocation(float xOffset, float yOffset);
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|
|
void scale(float scaleFactor);
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|
|
|
#ifdef HAVE_ANDROID_OS
|
|
void transform(const SkMatrix* matrix);
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|
|
status_t readFromParcel(Parcel* parcel);
|
|
status_t writeToParcel(Parcel* parcel) const;
|
|
#endif
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|
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static bool isTouchEvent(int32_t source, int32_t action);
|
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inline bool isTouchEvent() const {
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return isTouchEvent(mSource, mAction);
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}
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|
|
// Low-level accessors.
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|
inline const int32_t* getPointerIds() const { return mPointerIds.array(); }
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inline const nsecs_t* getSampleEventTimes() const { return mSampleEventTimes.array(); }
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|
inline const PointerCoords* getSamplePointerCoords() const {
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return mSamplePointerCoords.array();
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}
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|
|
|
protected:
|
|
int32_t mAction;
|
|
int32_t mFlags;
|
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int32_t mEdgeFlags;
|
|
int32_t mMetaState;
|
|
float mXOffset;
|
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float mYOffset;
|
|
float mXPrecision;
|
|
float mYPrecision;
|
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nsecs_t mDownTime;
|
|
Vector<int32_t> mPointerIds;
|
|
Vector<nsecs_t> mSampleEventTimes;
|
|
Vector<PointerCoords> mSamplePointerCoords;
|
|
};
|
|
|
|
/*
|
|
* Input event factory.
|
|
*/
|
|
class InputEventFactoryInterface {
|
|
protected:
|
|
virtual ~InputEventFactoryInterface() { }
|
|
|
|
public:
|
|
InputEventFactoryInterface() { }
|
|
|
|
virtual KeyEvent* createKeyEvent() = 0;
|
|
virtual MotionEvent* createMotionEvent() = 0;
|
|
};
|
|
|
|
/*
|
|
* A simple input event factory implementation that uses a single preallocated instance
|
|
* of each type of input event that are reused for each request.
|
|
*/
|
|
class PreallocatedInputEventFactory : public InputEventFactoryInterface {
|
|
public:
|
|
PreallocatedInputEventFactory() { }
|
|
virtual ~PreallocatedInputEventFactory() { }
|
|
|
|
virtual KeyEvent* createKeyEvent() { return & mKeyEvent; }
|
|
virtual MotionEvent* createMotionEvent() { return & mMotionEvent; }
|
|
|
|
private:
|
|
KeyEvent mKeyEvent;
|
|
MotionEvent mMotionEvent;
|
|
};
|
|
|
|
/*
|
|
* Calculates the velocity of pointer movements over time.
|
|
*/
|
|
class VelocityTracker {
|
|
public:
|
|
struct Position {
|
|
float x, y;
|
|
};
|
|
|
|
VelocityTracker();
|
|
|
|
// Resets the velocity tracker state.
|
|
void clear();
|
|
|
|
// Resets the velocity tracker state for specific pointers.
|
|
// Call this method when some pointers have changed and may be reusing
|
|
// an id that was assigned to a different pointer earlier.
|
|
void clearPointers(BitSet32 idBits);
|
|
|
|
// Adds movement information for a set of pointers.
|
|
// The idBits bitfield specifies the pointer ids of the pointers whose positions
|
|
// are included in the movement.
|
|
// The positions array contains position information for each pointer in order by
|
|
// increasing id. Its size should be equal to the number of one bits in idBits.
|
|
void addMovement(nsecs_t eventTime, BitSet32 idBits, const Position* positions);
|
|
|
|
// Adds movement information for all pointers in a MotionEvent, including historical samples.
|
|
void addMovement(const MotionEvent* event);
|
|
|
|
// Gets the velocity of the specified pointer id in position units per second.
|
|
// Returns false and sets the velocity components to zero if there is no movement
|
|
// information for the pointer.
|
|
bool getVelocity(uint32_t id, float* outVx, float* outVy) const;
|
|
|
|
// Gets the active pointer id, or -1 if none.
|
|
inline int32_t getActivePointerId() const { return mActivePointerId; }
|
|
|
|
// Gets a bitset containing all pointer ids from the most recent movement.
|
|
inline BitSet32 getCurrentPointerIdBits() const { return mMovements[mIndex].idBits; }
|
|
|
|
private:
|
|
// Number of samples to keep.
|
|
static const uint32_t HISTORY_SIZE = 10;
|
|
|
|
// Oldest sample to consider when calculating the velocity.
|
|
static const nsecs_t MAX_AGE = 200 * 1000000; // 200 ms
|
|
|
|
// The minimum duration between samples when estimating velocity.
|
|
static const nsecs_t MIN_DURATION = 10 * 1000000; // 10 ms
|
|
|
|
struct Movement {
|
|
nsecs_t eventTime;
|
|
BitSet32 idBits;
|
|
Position positions[MAX_POINTERS];
|
|
};
|
|
|
|
uint32_t mIndex;
|
|
Movement mMovements[HISTORY_SIZE];
|
|
int32_t mActivePointerId;
|
|
};
|
|
|
|
/*
|
|
* Describes the characteristics and capabilities of an input device.
|
|
*/
|
|
class InputDeviceInfo {
|
|
public:
|
|
InputDeviceInfo();
|
|
InputDeviceInfo(const InputDeviceInfo& other);
|
|
~InputDeviceInfo();
|
|
|
|
struct MotionRange {
|
|
int32_t axis;
|
|
uint32_t source;
|
|
float min;
|
|
float max;
|
|
float flat;
|
|
float fuzz;
|
|
};
|
|
|
|
void initialize(int32_t id, const String8& name);
|
|
|
|
inline int32_t getId() const { return mId; }
|
|
inline const String8 getName() const { return mName; }
|
|
inline uint32_t getSources() const { return mSources; }
|
|
|
|
const MotionRange* getMotionRange(int32_t axis, uint32_t source) const;
|
|
|
|
void addSource(uint32_t source);
|
|
void addMotionRange(int32_t axis, uint32_t source,
|
|
float min, float max, float flat, float fuzz);
|
|
void addMotionRange(const MotionRange& range);
|
|
|
|
inline void setKeyboardType(int32_t keyboardType) { mKeyboardType = keyboardType; }
|
|
inline int32_t getKeyboardType() const { return mKeyboardType; }
|
|
|
|
inline const Vector<MotionRange>& getMotionRanges() const {
|
|
return mMotionRanges;
|
|
}
|
|
|
|
private:
|
|
int32_t mId;
|
|
String8 mName;
|
|
uint32_t mSources;
|
|
int32_t mKeyboardType;
|
|
|
|
Vector<MotionRange> mMotionRanges;
|
|
};
|
|
|
|
/*
|
|
* Identifies a device.
|
|
*/
|
|
struct InputDeviceIdentifier {
|
|
inline InputDeviceIdentifier() :
|
|
bus(0), vendor(0), product(0), version(0) {
|
|
}
|
|
|
|
String8 name;
|
|
String8 location;
|
|
String8 uniqueId;
|
|
uint16_t bus;
|
|
uint16_t vendor;
|
|
uint16_t product;
|
|
uint16_t version;
|
|
};
|
|
|
|
/* Types of input device configuration files. */
|
|
enum InputDeviceConfigurationFileType {
|
|
INPUT_DEVICE_CONFIGURATION_FILE_TYPE_CONFIGURATION = 0, /* .idc file */
|
|
INPUT_DEVICE_CONFIGURATION_FILE_TYPE_KEY_LAYOUT = 1, /* .kl file */
|
|
INPUT_DEVICE_CONFIGURATION_FILE_TYPE_KEY_CHARACTER_MAP = 2, /* .kcm file */
|
|
};
|
|
|
|
/*
|
|
* Gets the path of an input device configuration file, if one is available.
|
|
* Considers both system provided and user installed configuration files.
|
|
*
|
|
* The device identifier is used to construct several default configuration file
|
|
* names to try based on the device name, vendor, product, and version.
|
|
*
|
|
* Returns an empty string if not found.
|
|
*/
|
|
extern String8 getInputDeviceConfigurationFilePathByDeviceIdentifier(
|
|
const InputDeviceIdentifier& deviceIdentifier,
|
|
InputDeviceConfigurationFileType type);
|
|
|
|
/*
|
|
* Gets the path of an input device configuration file, if one is available.
|
|
* Considers both system provided and user installed configuration files.
|
|
*
|
|
* The name is case-sensitive and is used to construct the filename to resolve.
|
|
* All characters except 'a'-'z', 'A'-'Z', '0'-'9', '-', and '_' are replaced by underscores.
|
|
*
|
|
* Returns an empty string if not found.
|
|
*/
|
|
extern String8 getInputDeviceConfigurationFilePathByName(
|
|
const String8& name, InputDeviceConfigurationFileType type);
|
|
|
|
} // namespace android
|
|
|
|
#endif // _UI_INPUT_H
|