1// Copyright (C) 2011, Google Inc. All rights reserved.
2//
3// Redistribution and use in source and binary forms, with or without
4// modification, are permitted provided that the following conditions are met:
5//
6// 1. Redistributions of source code must retain the above copyright
7//    notice, this list of conditions and the following disclaimer.
8// 2. Redistributions in binary form must reproduce the above copyright
9//    notice, this list of conditions and the following disclaimer in the
10//    documentation and/or other materials provided with the distribution.
11//
12// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
13// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
14// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
15// ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
16// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
17// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
18// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
19// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
20// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
21// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
22// DAMAGE.
23
24#ifndef WebGamepads_h
25#define WebGamepads_h
26
27#include "WebGamepad.h"
28
29#if BLINK_IMPLEMENTATION
30#include "wtf/Assertions.h"
31#endif
32
33#pragma pack(push, 1)
34
35namespace blink {
36
37// This structure is intentionally POD and fixed size so that it can be stored
38// in shared memory between hardware polling threads and the rest of the
39// browser.
40class WebGamepads {
41public:
42    WebGamepads()
43        : length(0) { }
44
45    static const size_t itemsLengthCap = 4;
46
47    // Number of valid entries in the items array.
48    unsigned length;
49
50    // Gamepad data for N separate gamepad devices.
51    WebGamepad items[itemsLengthCap];
52};
53
54#if BLINK_IMPLEMENTATION
55COMPILE_ASSERT(sizeof(WebGamepads) == 2888, WebGamepads_has_wrong_size);
56#endif
57
58#pragma pack(pop)
59
60}
61
62#endif // WebGamepads_h
63