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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "content/renderer/gamepad_shared_memory_reader.h" | 5 #include "content/renderer/gamepad_shared_memory_reader.h" |
6 | 6 |
7 #include "base/metrics/histogram_macros.h" | 7 #include "base/metrics/histogram_macros.h" |
8 #include "base/trace_event/trace_event.h" | 8 #include "base/trace_event/trace_event.h" |
9 #include "content/public/common/service_names.mojom.h" | 9 #include "content/public/common/service_names.mojom.h" |
10 #include "content/public/renderer/render_thread.h" | 10 #include "content/public/renderer/render_thread.h" |
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53 | 53 |
54 renderer_shared_buffer_mapping_ = | 54 renderer_shared_buffer_mapping_ = |
55 renderer_shared_buffer_handle_->Map(sizeof(GamepadHardwareBuffer)); | 55 renderer_shared_buffer_handle_->Map(sizeof(GamepadHardwareBuffer)); |
56 CHECK(renderer_shared_buffer_mapping_); | 56 CHECK(renderer_shared_buffer_mapping_); |
57 void* memory = renderer_shared_buffer_mapping_.get(); | 57 void* memory = renderer_shared_buffer_mapping_.get(); |
58 CHECK(memory); | 58 CHECK(memory); |
59 gamepad_hardware_buffer_ = | 59 gamepad_hardware_buffer_ = |
60 static_cast<GamepadHardwareBuffer*>(memory); | 60 static_cast<GamepadHardwareBuffer*>(memory); |
61 } | 61 } |
62 | 62 |
63 void GamepadSharedMemoryReader::SampleGamepads(blink::WebGamepads& gamepads) { | 63 void GamepadSharedMemoryReader::SampleGamepads(device::Gamepads& gamepads) { |
64 // Blink should have started observing at that point. | 64 // Blink should have started observing at that point. |
65 CHECK(is_observing()); | 65 CHECK(is_observing()); |
66 | 66 |
67 // ========== | 67 // ========== |
68 // DANGER | 68 // DANGER |
69 // ========== | 69 // ========== |
70 // | 70 // |
71 // This logic is duplicated in Pepper as well. If you change it, that also | 71 // This logic is duplicated in Pepper as well. If you change it, that also |
72 // needs to be in sync. See ppapi/proxy/gamepad_resource.cc. | 72 // needs to be in sync. See ppapi/proxy/gamepad_resource.cc. |
73 blink::WebGamepads read_into; | 73 device::Gamepads read_into; |
74 TRACE_EVENT0("GAMEPAD", "SampleGamepads"); | 74 TRACE_EVENT0("GAMEPAD", "SampleGamepads"); |
75 | 75 |
76 if (!renderer_shared_buffer_handle_.is_valid()) | 76 if (!renderer_shared_buffer_handle_.is_valid()) |
77 return; | 77 return; |
78 | 78 |
79 // Only try to read this many times before failing to avoid waiting here | 79 // Only try to read this many times before failing to avoid waiting here |
80 // very long in case of contention with the writer. TODO(scottmg) Tune this | 80 // very long in case of contention with the writer. TODO(scottmg) Tune this |
81 // number (as low as 1?) if histogram shows distribution as mostly | 81 // number (as low as 1?) if histogram shows distribution as mostly |
82 // 0-and-maximum. | 82 // 0-and-maximum. |
83 const int kMaximumContentionCount = 10; | 83 const int kMaximumContentionCount = 10; |
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100 } | 100 } |
101 | 101 |
102 // New data was read successfully, copy it into the output buffer. | 102 // New data was read successfully, copy it into the output buffer. |
103 memcpy(&gamepads, &read_into, sizeof(gamepads)); | 103 memcpy(&gamepads, &read_into, sizeof(gamepads)); |
104 | 104 |
105 if (!ever_interacted_with_) { | 105 if (!ever_interacted_with_) { |
106 // Clear the connected flag if the user hasn't interacted with any of the | 106 // Clear the connected flag if the user hasn't interacted with any of the |
107 // gamepads to prevent fingerprinting. The actual data is not cleared. | 107 // gamepads to prevent fingerprinting. The actual data is not cleared. |
108 // WebKit will only copy out data into the JS buffers for connected | 108 // WebKit will only copy out data into the JS buffers for connected |
109 // gamepads so this is sufficient. | 109 // gamepads so this is sufficient. |
110 for (unsigned i = 0; i < blink::WebGamepads::kItemsLengthCap; i++) | 110 for (unsigned i = 0; i < device::Gamepads::kItemsLengthCap; i++) |
111 gamepads.items[i].connected = false; | 111 gamepads.items[i].connected = false; |
112 } | 112 } |
113 } | 113 } |
114 | 114 |
115 GamepadSharedMemoryReader::~GamepadSharedMemoryReader() { | 115 GamepadSharedMemoryReader::~GamepadSharedMemoryReader() { |
116 StopIfObserving(); | 116 StopIfObserving(); |
117 } | 117 } |
118 | 118 |
119 void GamepadSharedMemoryReader::GamepadConnected( | 119 void GamepadSharedMemoryReader::GamepadConnected( |
120 int index, | 120 int index, |
121 const blink::WebGamepad& gamepad) { | 121 const device::Gamepad& gamepad) { |
122 // The browser already checks if the user actually interacted with a device. | 122 // The browser already checks if the user actually interacted with a device. |
123 ever_interacted_with_ = true; | 123 ever_interacted_with_ = true; |
124 | 124 |
125 if (listener()) | 125 if (listener()) |
126 listener()->DidConnectGamepad(index, gamepad); | 126 listener()->DidConnectGamepad(index, gamepad); |
127 } | 127 } |
128 | 128 |
129 void GamepadSharedMemoryReader::GamepadDisconnected( | 129 void GamepadSharedMemoryReader::GamepadDisconnected( |
130 int index, | 130 int index, |
131 const blink::WebGamepad& gamepad) { | 131 const device::Gamepad& gamepad) { |
132 if (listener()) | 132 if (listener()) |
133 listener()->DidDisconnectGamepad(index, gamepad); | 133 listener()->DidDisconnectGamepad(index, gamepad); |
134 } | 134 } |
135 | 135 |
136 } // namespace content | 136 } // namespace content |
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