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Side by Side Diff: content/renderer/gamepad_shared_memory_reader.cc

Issue 63253002: Rename WebKit namespace to blink (part 3) (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 7 years, 1 month ago
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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"
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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;
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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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