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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "content/browser/device_orientation/orientation.h" |
| 6 |
| 7 #include <cmath> |
| 8 |
| 9 #include "content/common/device_orientation_messages.h" |
| 10 |
| 11 namespace device_orientation { |
| 12 |
| 13 Orientation::Orientation() |
| 14 : can_provide_alpha_(false), |
| 15 can_provide_beta_(false), |
| 16 can_provide_gamma_(false), |
| 17 can_provide_absolute_(false) { |
| 18 } |
| 19 |
| 20 Orientation::~Orientation() { |
| 21 } |
| 22 |
| 23 IPC::Message* Orientation::CreateIPCMessage(int render_view_id) const { |
| 24 DeviceOrientationMsg_Updated_Params params; |
| 25 params.can_provide_alpha = can_provide_alpha_; |
| 26 params.alpha = alpha_; |
| 27 params.can_provide_beta = can_provide_beta_; |
| 28 params.beta = beta_; |
| 29 params.can_provide_gamma = can_provide_gamma_; |
| 30 params.gamma = gamma_; |
| 31 params.can_provide_absolute = can_provide_absolute_; |
| 32 params.absolute = absolute_; |
| 33 |
| 34 return new DeviceOrientationMsg_Updated(render_view_id, params); |
| 35 } |
| 36 |
| 37 // Returns true if two orientations are considered different enough that |
| 38 // observers should be notified of the new orientation. |
| 39 bool Orientation::ShouldFireEvent(const DeviceData* old_data) const { |
| 40 scoped_refptr<const Orientation> old_orientation( |
| 41 static_cast<const Orientation*>(old_data)); |
| 42 |
| 43 return IsElementSignificantlyDifferent(can_provide_alpha_, |
| 44 old_orientation->can_provide_alpha(), |
| 45 alpha_, |
| 46 old_orientation->alpha()) || |
| 47 IsElementSignificantlyDifferent(can_provide_beta_, |
| 48 old_orientation->can_provide_beta(), |
| 49 beta_, |
| 50 old_orientation->beta()) || |
| 51 IsElementSignificantlyDifferent(can_provide_gamma_, |
| 52 old_orientation->can_provide_gamma(), |
| 53 gamma_, |
| 54 old_orientation->gamma()) || |
| 55 can_provide_absolute_ != old_orientation->can_provide_absolute() || |
| 56 absolute_ != old_orientation->absolute(); |
| 57 } |
| 58 |
| 59 bool Orientation::IsElementSignificantlyDifferent(bool can_provide_element1, |
| 60 bool can_provide_element2, double element1, double element2) { |
| 61 const double kThreshold = 0.1; |
| 62 |
| 63 if (can_provide_element1 != can_provide_element2) |
| 64 return true; |
| 65 if (can_provide_element1 && std::fabs(element1 - element2) >= kThreshold) |
| 66 return true; |
| 67 return false; |
| 68 } |
| 69 |
| 70 } // namespace device_orientation |
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