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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_GAMEPAD_GAMEPAD_DATA_FETCHER_H_
#define CONTENT_BROWSER_GAMEPAD_GAMEPAD_DATA_FETCHER_H_
#include <stdint.h>
#include "build/build_config.h"
#include "content/browser/gamepad/gamepad_standard_mappings.h"
#include "third_party/WebKit/public/platform/WebGamepads.h"
namespace content {
// Abstract interface for imlementing platform- (and test-) specific behaviro
// for getting the gamepad data.
class GamepadDataFetcher {
public:
virtual ~GamepadDataFetcher() {}
virtual void GetGamepadData(blink::WebGamepads* pads,
bool devices_changed_hint) = 0;
virtual void PauseHint(bool paused) {}
#if !defined(OS_ANDROID)
struct PadState {
// Gamepad data, unmapped.
blink::WebGamepad data;
// Functions to map from device data to standard layout, if available. May
// be null if no mapping is available.
GamepadStandardMappingFunction mapper;
// Sanitization masks
// axis_mask and button_mask are bitfields that represent the reset state of
// each input. If a button or axis has ever reported 0 in the past the
// corresponding bit will be set to 1.
// If we ever increase the max axis count this will need to be updated.
static_assert(blink::WebGamepad::axesLengthCap <=
std::numeric_limits<uint32_t>::digits,
"axis_mask is not large enough");
uint32_t axis_mask;
// If we ever increase the max button count this will need to be updated.
static_assert(blink::WebGamepad::buttonsLengthCap <=
std::numeric_limits<uint32_t>::digits,
"button_mask is not large enough");
uint32_t button_mask;
};
void MapAndSanitizeGamepadData(PadState* pad_state, blink::WebGamepad* pad);
protected:
PadState pad_state_[blink::WebGamepads::itemsLengthCap];
#endif
};
} // namespace content
#endif // CONTENT_BROWSER_GAMEPAD_GAMEPAD_DATA_FETCHER_H_
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