Added relative mouse move support to win32.

lib/platform/CMSWindowsDesks.cpp

@@ -72,6 +72,8 @@
 #define SYNERGY_MSG_SYNC_KEYS		SYNERGY_HOOK_LAST_MSG + 9
 // install; <unused>
 #define SYNERGY_MSG_SCREENSAVER		SYNERGY_HOOK_LAST_MSG + 10
+// dx; dy
+#define SYNERGY_MSG_FAKE_REL_MOVE	SYNERGY_HOOK_LAST_MSG + 11
 
 //
 // CMSWindowsDesks
@@ -293,6 +295,14 @@ CMSWindowsDesks::fakeMouseMove(SInt32 x, SInt32 y) const
 							static_cast<LPARAM>(y));
 }
 
+void
+CMSWindowsDesks::fakeMouseRelativeMove(SInt32 dx, SInt32 dy) const
+{
+	sendMessage(SYNERGY_MSG_FAKE_REL_MOVE,
+							static_cast<WPARAM>(dx),
+							static_cast<LPARAM>(dy));
+}
+
 void
 CMSWindowsDesks::fakeMouseWheel(SInt32 delta) const
 {
@@ -492,16 +502,26 @@ CMSWindowsDesks::deskMouseMove(SInt32 x, SInt32 y) const
 	// the right place, the effect is disconcerting.
 	//
 	// instead we'll get the cursor's current position and do just a
-	// relative move from there to the desired position.  relative
-	// moves are subject to cursor acceleration which we don't want.
-	// so we disable acceleration, do the relative move, then restore
-	// acceleration.  there's a slight chance we'll end up in the
-	// wrong place if the user moves the cursor using this system's
+	// relative move from there to the desired position.
+	else {
+		POINT pos;
+		GetCursorPos(&pos);
+		deskMouseRelativeMove(x - pos.x, y - pos.y);
+	}
+}
+
+void
+CMSWindowsDesks::deskMouseRelativeMove(SInt32 dx, SInt32 dy) const
+{
+	// relative moves are subject to cursor acceleration which we don't
+	// want.so we disable acceleration, do the relative move, then
+	// restore acceleration.  there's a slight chance we'll end up in
+	// the wrong place if the user moves the cursor using this system's
 	// mouse while simultaneously moving the mouse on the server
 	// system.  that defeats the purpose of synergy so we'll assume
 	// that won't happen.  even if it does, the next mouse move will
 	// correct the position.
-	else {
+
 	// save mouse speed & acceleration
 	int oldSpeed[4];
 	bool accelChanged =
@@ -517,16 +537,13 @@ CMSWindowsDesks::deskMouseMove(SInt32 x, SInt32 y) const
 	}
 
 	// move relative to mouse position
-		POINT pos;
-		GetCursorPos(&pos);
-		mouse_event(MOUSEEVENTF_MOVE, x - pos.x, y - pos.y, 0, 0);
+	mouse_event(MOUSEEVENTF_MOVE, dx, dy, 0, 0);
 
 	// restore mouse speed & acceleration
 	if (accelChanged) {
 		SystemParametersInfo(SPI_SETMOUSE, 0, oldSpeed, 0);
 		SystemParametersInfo(SPI_SETMOUSESPEED, 0, oldSpeed + 3, 0);
 	}
-	}
 }
 
 void
@@ -693,6 +710,11 @@ CMSWindowsDesks::deskThread(void* vdesk)
 							static_cast<SInt32>(msg.lParam));
 			break;
 
+		case SYNERGY_MSG_FAKE_REL_MOVE:
+			deskMouseRelativeMove(static_cast<SInt32>(msg.wParam),
+							static_cast<SInt32>(msg.lParam));
+			break;
+
 		case SYNERGY_MSG_FAKE_WHEEL:
 			mouse_event(MOUSEEVENTF_WHEEL, 0, 0, msg.wParam, 0);
 			break;

lib/platform/CMSWindowsDesks.h

@@ -144,6 +144,12 @@ public:
 	*/
 	void				fakeMouseMove(SInt32 x, SInt32 y) const;
 
+	//! Fake mouse move
+	/*!
+	Synthesize a mouse move to the relative coordinates \c dx,dy.
+	*/
+	void				fakeMouseRelativeMove(SInt32 dx, SInt32 dy) const;
+
 	//! Fake mouse wheel
 	/*!
 	Synthesize a mouse wheel event of amount \c delta.
@@ -176,6 +182,7 @@ private:
 
 	// message handlers
 	void				deskMouseMove(SInt32 x, SInt32 y) const;
+	void				deskMouseRelativeMove(SInt32 dx, SInt32 dy) const;
 	void				deskEnter(CDesk* desk);
 	void				deskLeave(CDesk* desk, HKL keyLayout);
 	void				deskThread(void* vdesk);

lib/platform/CMSWindowsScreen.cpp

@@ -507,6 +507,12 @@ CMSWindowsScreen::fakeMouseMove(SInt32 x, SInt32 y) const
 	m_desks->fakeMouseMove(x, y);
 }
 
+void
+CMSWindowsScreen::fakeMouseRelativeMove(SInt32 dx, SInt32 dy) const
+{
+	m_desks->fakeMouseRelativeMove(dx, dy);
+}
+
 void
 CMSWindowsScreen::fakeMouseWheel(SInt32 delta) const
 {

lib/platform/CMSWindowsScreen.h

@@ -75,6 +75,7 @@ public:
 	// ISecondaryScreen overrides
 	virtual void		fakeMouseButton(ButtonID id, bool press) const;
 	virtual void		fakeMouseMove(SInt32 x, SInt32 y) const;
+	virtual void		fakeMouseRelativeMove(SInt32 dx, SInt32 dy) const;
 	virtual void		fakeMouseWheel(SInt32 delta) const;
 
 	// IKeyState overrides