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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/debug/trace_event.h" | 7 #include "base/debug/trace_event.h" |
| 8 #include "base/metrics/histogram.h" | 8 #include "base/metrics/histogram.h" |
| 9 #include "content/common/gamepad_messages.h" | 9 #include "content/common/gamepad_messages.h" |
| 10 #include "content/common/gamepad_user_gesture.h" | 10 #include "content/common/gamepad_user_gesture.h" |
| (...skipping 17 matching lines...) Expand all Loading... |
| 28 return; | 28 return; |
| 29 renderer_shared_memory_.reset( | 29 renderer_shared_memory_.reset( |
| 30 new base::SharedMemory(renderer_shared_memory_handle_, true)); | 30 new base::SharedMemory(renderer_shared_memory_handle_, true)); |
| 31 CHECK(renderer_shared_memory_->Map(sizeof(GamepadHardwareBuffer))); | 31 CHECK(renderer_shared_memory_->Map(sizeof(GamepadHardwareBuffer))); |
| 32 void *memory = renderer_shared_memory_->memory(); | 32 void *memory = renderer_shared_memory_->memory(); |
| 33 CHECK(memory); | 33 CHECK(memory); |
| 34 gamepad_hardware_buffer_ = | 34 gamepad_hardware_buffer_ = |
| 35 static_cast<GamepadHardwareBuffer*>(memory); | 35 static_cast<GamepadHardwareBuffer*>(memory); |
| 36 } | 36 } |
| 37 | 37 |
| 38 void GamepadSharedMemoryReader::SampleGamepads(WebKit::WebGamepads& gamepads) { | 38 void GamepadSharedMemoryReader::SampleGamepads(blink::WebGamepads& gamepads) { |
| 39 // ========== | 39 // ========== |
| 40 // DANGER | 40 // DANGER |
| 41 // ========== | 41 // ========== |
| 42 // | 42 // |
| 43 // This logic is duplicated in Pepper as well. If you change it, that also | 43 // This logic is duplicated in Pepper as well. If you change it, that also |
| 44 // needs to be in sync. See ppapi/proxy/gamepad_resource.cc. | 44 // needs to be in sync. See ppapi/proxy/gamepad_resource.cc. |
| 45 WebKit::WebGamepads read_into; | 45 blink::WebGamepads read_into; |
| 46 TRACE_EVENT0("GAMEPAD", "SampleGamepads"); | 46 TRACE_EVENT0("GAMEPAD", "SampleGamepads"); |
| 47 | 47 |
| 48 if (!base::SharedMemory::IsHandleValid(renderer_shared_memory_handle_)) | 48 if (!base::SharedMemory::IsHandleValid(renderer_shared_memory_handle_)) |
| 49 return; | 49 return; |
| 50 | 50 |
| 51 // Only try to read this many times before failing to avoid waiting here | 51 // Only try to read this many times before failing to avoid waiting here |
| 52 // very long in case of contention with the writer. TODO(scottmg) Tune this | 52 // very long in case of contention with the writer. TODO(scottmg) Tune this |
| 53 // number (as low as 1?) if histogram shows distribution as mostly | 53 // number (as low as 1?) if histogram shows distribution as mostly |
| 54 // 0-and-maximum. | 54 // 0-and-maximum. |
| 55 const int kMaximumContentionCount = 10; | 55 const int kMaximumContentionCount = 10; |
| (...skipping 19 matching lines...) Expand all Loading... |
| 75 memcpy(&gamepads, &read_into, sizeof(gamepads)); | 75 memcpy(&gamepads, &read_into, sizeof(gamepads)); |
| 76 | 76 |
| 77 if (!ever_interacted_with_) { | 77 if (!ever_interacted_with_) { |
| 78 if (GamepadsHaveUserGesture(gamepads)) { | 78 if (GamepadsHaveUserGesture(gamepads)) { |
| 79 ever_interacted_with_ = true; | 79 ever_interacted_with_ = true; |
| 80 } else { | 80 } else { |
| 81 // Clear the connected flag if the user hasn't interacted with any of the | 81 // Clear the connected flag if the user hasn't interacted with any of the |
| 82 // gamepads to prevent fingerprinting. The actual data is not cleared. | 82 // gamepads to prevent fingerprinting. The actual data is not cleared. |
| 83 // WebKit will only copy out data into the JS buffers for connected | 83 // WebKit will only copy out data into the JS buffers for connected |
| 84 // gamepads so this is sufficient. | 84 // gamepads so this is sufficient. |
| 85 for (unsigned i = 0; i < WebKit::WebGamepads::itemsLengthCap; i++) | 85 for (unsigned i = 0; i < blink::WebGamepads::itemsLengthCap; i++) |
| 86 gamepads.items[i].connected = false; | 86 gamepads.items[i].connected = false; |
| 87 } | 87 } |
| 88 } | 88 } |
| 89 } | 89 } |
| 90 | 90 |
| 91 GamepadSharedMemoryReader::~GamepadSharedMemoryReader() { | 91 GamepadSharedMemoryReader::~GamepadSharedMemoryReader() { |
| 92 RenderThread::Get()->Send(new GamepadHostMsg_StopPolling()); | 92 RenderThread::Get()->Send(new GamepadHostMsg_StopPolling()); |
| 93 } | 93 } |
| 94 | 94 |
| 95 } // namespace content | 95 } // namespace content |
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