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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 namespace blink {
34 
35 #pragma pack(push, 1)
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.
40 class WebGamepads {
41 public:
WebGamepads()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
55 COMPILE_ASSERT(sizeof(WebGamepads) == 1864, WebGamepads_has_wrong_size);
56 #endif
57 
58 #pragma pack(pop)
59 
60 }
61 
62 #endif // WebGamepads_h
63