third_party/WebKit/public/platform/WebGamepads.h

   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
  35 namespace 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.
  40 class WebGamepads {
  41 public:
  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 static_assert(sizeof(WebGamepads) == 2888, "WebGamepads has wrong size");
  56 #endif
  57
  58 #pragma pack(pop)
  59
  60 }
  61
  62 #endif // WebGamepads_h