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// Copyright 2015 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 REMOTING_HOST_TOUCH_INJECTOR_WIN_H_
#define REMOTING_HOST_TOUCH_INJECTOR_WIN_H_
#include <windows.h>
#include <stdint.h>
#include <map>
#include <vector>
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/scoped_native_library.h"
namespace remoting {
namespace protocol {
class TouchEvent;
} // namespace protocol
// This class calls InitializeTouchInjection() and InjectTouchInput() functions.
// The methods are virtual for mocking.
class TouchInjectorWinDelegate {
public:
virtual ~TouchInjectorWinDelegate();
// Determines whether Windows touch injection functions can be used.
// Returns a non-null TouchInjectorWinDelegate on success.
static scoped_ptr<TouchInjectorWinDelegate> Create();
// These match the functions in MSDN.
virtual BOOL InitializeTouchInjection(UINT32 max_count, DWORD dw_mode);
virtual DWORD InjectTouchInput(UINT32 count,
const POINTER_TOUCH_INFO* contacts);
protected:
// Ctor in protected scope for mocking.
// This object takes ownership of the |library|.
TouchInjectorWinDelegate(
base::NativeLibrary library,
BOOL(NTAPI* initialize_touch_injection_func)(UINT32, DWORD),
BOOL(NTAPI* inject_touch_input_func)(UINT32, const POINTER_TOUCH_INFO*));
private:
base::ScopedNativeLibrary library_module_;
// Pointers to Windows touch injection functions.
BOOL(NTAPI* initialize_touch_injection_func_)(UINT32, DWORD);
BOOL(NTAPI* inject_touch_input_func_)(UINT32, const POINTER_TOUCH_INFO*);
DISALLOW_COPY_AND_ASSIGN(TouchInjectorWinDelegate);
};
// This class converts TouchEvent objects to POINTER_TOUCH_INFO so that it can
// be injected using the Windows touch injection API, and calls the injection
// functions.
// This class expects good inputs and does not sanity check the inputs.
// This class just converts the object and hands it off to the Windows API.
class TouchInjectorWin {
public:
TouchInjectorWin();
~TouchInjectorWin();
// Returns false if initialization of touch injection APIs fails.
bool Init();
// Deinitializes the object so that it can be reinitialized.
void Deinitialize();
// Inject touch events.
void InjectTouchEvent(const protocol::TouchEvent& event);
void SetInjectorDelegateForTest(
scoped_ptr<TouchInjectorWinDelegate> functions);
private:
// Helper methods called from InjectTouchEvent().
// These helpers adapt Chromoting touch events, which convey changes to touch
// points, to Windows touch descriptions, which must include descriptions for
// all currently-active touch points, not just the changed ones.
void AddNewTouchPoints(const protocol::TouchEvent& event);
void MoveTouchPoints(const protocol::TouchEvent& event);
void EndTouchPoints(const protocol::TouchEvent& event);
void CancelTouchPoints(const protocol::TouchEvent& event);
// Set to null if touch injection is not available from the OS.
scoped_ptr<TouchInjectorWinDelegate> delegate_;
// TODO(rkuroiwa): crbug.com/470203
// This is a naive implementation. Check if we can achieve
// better performance by reducing the number of copies.
// To reduce the number of copies, we can have a vector of
// POINTER_TOUCH_INFO and a map from touch ID to index in the vector.
// When removing points from the vector, just swap it with the last element
// and resize the vector.
// All the POINTER_TOUCH_INFOs are stored as "move" points.
std::map<uint32_t, POINTER_TOUCH_INFO> touches_in_contact_;
DISALLOW_COPY_AND_ASSIGN(TouchInjectorWin);
};
} // namespace remoting
#endif // REMOTING_HOST_TOUCH_INJECTOR_WIN_H_
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