The Tor Browser / file comparison
comparison: widget/gonk/ProcessOrientation.h
widget/gonk/ProcessOrientation.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:0b2d9a9271f8 |
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| 1 /* | |
| 2 * Copyright (c) 2013, Linux Foundation. All rights reserved | |
| 3 * | |
| 4 * Copyright (C) 2008 The Android Open Source Project | |
| 5 * | |
| 6 * Licensed under the Apache License, Version 2.0 (the "License"); | |
| 7 * you may not use this file except in compliance with the License. | |
| 8 * You may obtain a copy of the License at | |
| 9 * | |
| 10 * http://www.apache.org/licenses/LICENSE-2.0 | |
| 11 * | |
| 12 * Unless required by applicable law or agreed to in writing, software | |
| 13 * distributed under the License is distributed on an "AS IS" BASIS, | |
| 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 15 * See the License for the specific language governing permissions and | |
| 16 * limitations under the License. | |
| 17 */ | |
| 18 | |
| 19 #ifndef ProcessOrientation_h | |
| 20 #define ProcessOrientation_h | |
| 21 | |
| 22 #include "mozilla/Hal.h" | |
| 23 | |
| 24 namespace mozilla { | |
| 25 | |
| 26 // History of observed tilt angles. | |
| 27 #define TILT_HISTORY_SIZE 40 | |
| 28 | |
| 29 class ProcessOrientation { | |
| 30 public: | |
| 31 ProcessOrientation() {}; | |
| 32 ~ProcessOrientation() {}; | |
| 33 | |
| 34 int OnSensorChanged(const mozilla::hal::SensorData& event, int deviceCurrentRotation); | |
| 35 int Reset(); | |
| 36 | |
| 37 private: | |
| 38 int GetProposedRotation(); | |
| 39 | |
| 40 // Returns true if the tilt angle is acceptable for a given predicted | |
| 41 // rotation. | |
| 42 bool IsTiltAngleAcceptable(int rotation, int tiltAngle); | |
| 43 | |
| 44 // Returns true if the orientation angle is acceptable for a given predicted | |
| 45 // rotation. This function takes into account the gap between adjacent | |
| 46 // orientations for hysteresis. | |
| 47 bool IsOrientationAngleAcceptable(int rotation, int orientationAngle, | |
| 48 int currentRotation); | |
| 49 | |
| 50 // Returns true if the predicted rotation is ready to be advertised as a | |
| 51 // proposed rotation. | |
| 52 bool IsPredictedRotationAcceptable(long now); | |
| 53 | |
| 54 void ClearPredictedRotation(); | |
| 55 void UpdatePredictedRotation(long now, int rotation); | |
| 56 bool IsAccelerating(float magnitude); | |
| 57 void ClearTiltHistory(); | |
| 58 void AddTiltHistoryEntry(long now, float tilt); | |
| 59 bool IsFlat(long now); | |
| 60 bool IsSwinging(long now, float tilt); | |
| 61 int NextTiltHistoryIndex(int index); | |
| 62 float RemainingMS(long now, long until); | |
| 63 | |
| 64 // The tilt angle range in degrees for each orientation. Beyond these tilt | |
| 65 // angles, we don't even consider transitioning into the specified orientation. | |
| 66 // We place more stringent requirements on unnatural orientations than natural | |
| 67 // ones to make it less likely to accidentally transition into those states. | |
| 68 // The first value of each pair is negative so it applies a limit when the | |
| 69 // device is facing down (overhead reading in bed). The second value of each | |
| 70 // pair is positive so it applies a limit when the device is facing up | |
| 71 // (resting on a table). The ideal tilt angle is 0 (when the device is vertical) | |
| 72 // so the limits establish how close to vertical the device must be in order | |
| 73 // to change orientation. | |
| 74 static const int tiltTolerance[][4]; | |
| 75 | |
| 76 // Timestamp and value of the last accelerometer sample. | |
| 77 long mLastFilteredTimestampNanos; | |
| 78 float mLastFilteredX, mLastFilteredY, mLastFilteredZ; | |
| 79 | |
| 80 // The last proposed rotation, -1 if unknown. | |
| 81 int mProposedRotation; | |
| 82 | |
| 83 // Value of the current predicted rotation, -1 if unknown. | |
| 84 int mPredictedRotation; | |
| 85 | |
| 86 // Timestamp of when the predicted rotation most recently changed. | |
| 87 long mPredictedRotationTimestampNanos; | |
| 88 | |
| 89 // Timestamp when the device last appeared to be flat for sure (the flat delay | |
| 90 // elapsed). | |
| 91 long mFlatTimestampNanos; | |
| 92 | |
| 93 // Timestamp when the device last appeared to be swinging. | |
| 94 long mSwingTimestampNanos; | |
| 95 | |
| 96 // Timestamp when the device last appeared to be undergoing external | |
| 97 // acceleration. | |
| 98 long mAccelerationTimestampNanos; | |
| 99 | |
| 100 struct { | |
| 101 struct { | |
| 102 float tiltAngle; | |
| 103 long timestampNanos; | |
| 104 } history[TILT_HISTORY_SIZE]; | |
| 105 int index; | |
| 106 } mTiltHistory; | |
| 107 }; | |
| 108 | |
| 109 } // namespace mozilla | |
| 110 #endif |
