112 lines
3.7 KiB
C++
112 lines
3.7 KiB
C++
/*
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* Copyright (c) 2013, Linux Foundation. All rights reserved
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*
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* Copyright (C) 2008 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 ProcessOrientation_h
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#define ProcessOrientation_h
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#include "mozilla/Hal.h"
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namespace mozilla {
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// History of observed tilt angles.
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#define TILT_HISTORY_SIZE 40
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class ProcessOrientation {
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public:
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ProcessOrientation() {};
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~ProcessOrientation() {};
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int OnSensorChanged(const mozilla::hal::SensorData& event, int deviceCurrentRotation);
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int Reset();
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private:
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int GetProposedRotation();
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// Returns true if the tilt angle is acceptable for a given predicted
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// rotation.
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bool IsTiltAngleAcceptable(int rotation, int tiltAngle);
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// Returns true if the orientation angle is acceptable for a given predicted
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// rotation. This function takes into account the gap between adjacent
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// orientations for hysteresis.
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bool IsOrientationAngleAcceptable(int rotation, int orientationAngle,
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int currentRotation);
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// Returns true if the predicted rotation is ready to be advertised as a
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// proposed rotation.
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bool IsPredictedRotationAcceptable(int64_t now);
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void ClearPredictedRotation();
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void UpdatePredictedRotation(int64_t now, int rotation);
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bool IsAccelerating(float magnitude);
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void ClearTiltHistory();
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void AddTiltHistoryEntry(int64_t now, float tilt);
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bool IsFlat(int64_t now);
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bool IsSwinging(int64_t now, float tilt);
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int NextTiltHistoryIndex(int index);
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float RemainingMS(int64_t now, int64_t until);
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// The tilt angle range in degrees for each orientation. Beyond these tilt
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// angles, we don't even consider transitioning into the specified orientation.
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// We place more stringent requirements on unnatural orientations than natural
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// ones to make it less likely to accidentally transition into those states.
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// The first value of each pair is negative so it applies a limit when the
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// device is facing down (overhead reading in bed). The second value of each
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// pair is positive so it applies a limit when the device is facing up
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// (resting on a table). The ideal tilt angle is 0 (when the device is vertical)
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// so the limits establish how close to vertical the device must be in order
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// to change orientation.
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static const int tiltTolerance[][4];
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// Timestamp and value of the last accelerometer sample.
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int64_t mLastFilteredTimestampNanos;
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float mLastFilteredX, mLastFilteredY, mLastFilteredZ;
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// The last proposed rotation, -1 if unknown.
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int mProposedRotation;
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// Value of the current predicted rotation, -1 if unknown.
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int mPredictedRotation;
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// Timestamp of when the predicted rotation most recently changed.
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int64_t mPredictedRotationTimestampNanos;
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// Timestamp when the device last appeared to be flat for sure (the flat delay
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// elapsed).
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int64_t mFlatTimestampNanos;
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// Timestamp when the device last appeared to be swinging.
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int64_t mSwingTimestampNanos;
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// Timestamp when the device last appeared to be undergoing external
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// acceleration.
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int64_t mAccelerationTimestampNanos;
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struct {
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struct {
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float tiltAngle;
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int64_t timestampNanos;
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} history[TILT_HISTORY_SIZE];
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int index;
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} mTiltHistory;
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};
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} // namespace mozilla
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#endif
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