Simplified the Windows touch implementation

src/SFML/Window/Win32/InputImpl.cpp

@@ -226,7 +226,7 @@ void InputImpl::setMousePosition(const Vector2i& position)
 ////////////////////////////////////////////////////////////
 void InputImpl::setMousePosition(const Vector2i& position, const WindowBase& relativeTo)
 {
-    WindowHandle handle = relativeTo.getSystemHandle();
+    const WindowHandle handle = relativeTo.getSystemHandle();
     if (handle)
     {
         POINT point = {position.x, position.y};
@@ -253,13 +253,13 @@ Vector2i InputImpl::getTouchPosition(unsigned int finger)
 ////////////////////////////////////////////////////////////
 Vector2i InputImpl::getTouchPosition(unsigned int finger, const WindowBase& relativeTo)
 {
-    WindowHandle handle = relativeTo.getSystemHandle();
+    const WindowHandle handle = relativeTo.getSystemHandle();
-    Vector2i pos;
+    Vector2i           pos;
 
     if (handle && WindowImplWin32::isTouchDown(finger))
     {
-        pos = WindowImplWin32::getTouchPosition(finger);
+        pos         = WindowImplWin32::getTouchPosition(finger);
-        POINT point = { pos.x, pos.y };
+        POINT point = {pos.x, pos.y};
         ScreenToClient(handle, &point);
         pos.x = point.x;
         pos.y = point.y;

src/SFML/Window/Win32/WindowImplWin32.cpp

@@ -56,68 +56,28 @@
 
 namespace
 {
+constexpr int maxTouchPoints = 10; // Current Windows API limitation
+
+// Define constants for tablet API to avoid pulling in an extra Tablet PC header
+const char*              tabletServiceProperty     = "MicrosoftTabletPenServiceProperty";
+const unsigned long long tabletDisablePressAndHold = 0x00000001ULL;
+
 unsigned int               windowCount      = 0; // Windows owned by SFML
 unsigned int               handleCount      = 0; // All window handles
 const wchar_t*             className        = L"SFML_Window";
 sf::priv::WindowImplWin32* fullscreenWindow = nullptr;
-HINSTANCE                  user32Dll        = nullptr;
+DWORD                      touchIDs[maxTouchPoints];
-DWORD                      touchIDs[10];
+POINT                      touches[maxTouchPoints];
-POINT                      touches[10];
-
-#if WINVER < 0x0601
-// Define touch API that's available for more recent versions of Windows
-#define WM_TOUCH 0x0240
-    
-DECLARE_HANDLE(HTOUCHINPUT);
-
-typedef struct tagTOUCHINPUT
-{
-    LONG x;
-    LONG y;
-    HANDLE hSource;
-    DWORD dwID;
-    DWORD dwFlags;
-    DWORD dwMask;
-    DWORD dwTime;
-    ULONG_PTR dwExtraInfo;
-    DWORD cxContact;
-    DWORD cyContact;
-} TOUCHINPUT, *PTOUCHINPUT;
-
-typedef TOUCHINPUT const * PCTOUCHINPUT;
-
-#define TOUCH_COORD_TO_PIXEL(l) ((l) / 100)
-    
-#define TOUCHEVENTF_MOVE            0x0001
-#define TOUCHEVENTF_DOWN            0x0002
-#define TOUCHEVENTF_UP              0x0004
-#define TOUCHEVENTF_INRANGE         0x0008
-#define TOUCHEVENTF_PRIMARY         0x0010
-#define TOUCHEVENTF_NOCOALESCE      0x0020
-#define TOUCHEVENTF_PEN             0x0040
-#define TOUCHEVENTF_PALM            0x0080
-    
-typedef BOOL(WINAPI* RegisterTouchWindowFuncType)(HWND, ULONG);
-typedef BOOL(WINAPI* CloseTouchInputHandleFuncType)(HTOUCHINPUT);
-typedef BOOL(WINAPI* GetTouchInputInfoFuncType)(HTOUCHINPUT, UINT, PTOUCHINPUT, int);
-
-RegisterTouchWindowFuncType   RegisterTouchWindow   = nullptr;
-CloseTouchInputHandleFuncType CloseTouchInputHandle = nullptr;
-GetTouchInputInfoFuncType     GetTouchInputInfo     = nullptr;
-bool                          touchEnabled          = false;
-#else
-static const bool             touchEnabled          = true;
-#endif
 
 // Convert a hardware dependent ID to a 0 based index we can use
 int getTouchID(DWORD id)
 {
-    for (int i = 0; i < 10; ++i)
+    for (int i = 0; i < maxTouchPoints; ++i)
     {
         if (touchIDs[i] == id)
             return i;
     }
-    for (int i = 0; i < 10; ++i)
+    for (int i = 0; i < maxTouchPoints; ++i)
     {
         if (touchIDs[i] == -1)
         {
@@ -142,7 +102,7 @@ std::string getErrorString(DWORD error)
                       nullptr) == 0)
         return "Unknown error.";
 
-    sf::String message = buffer;
+    const sf::String message = buffer;
     LocalFree(buffer);
     return message.toAnsiString();
 }
@@ -151,52 +111,17 @@ const GUID GUID_DEVINTERFACE_HID = {0x4d1e55b2, 0xf16f, 0x11cf, {0x88, 0xcb, 0x0
 
 void setProcessDpiAware()
 {
-    // Try SetProcessDpiAwareness first
+#if 0
-    HINSTANCE shCoreDll = LoadLibrary(L"Shcore.dll");
+    // Windows 8.1+
-
+    if (SetProcessDpiAwareness(PROCESS_SYSTEM_DPI_AWARE) == E_INVALIDARG)
-    if (shCoreDll)
     {
-        enum ProcessDpiAwareness
+        sf::err() << "Failed to set process DPI awareness" << std::endl;
-        {
-            ProcessDpiUnaware         = 0,
-            ProcessSystemDpiAware     = 1,
-            ProcessPerMonitorDpiAware = 2
-        };
-
-        using SetProcessDpiAwarenessFuncType = HRESULT(WINAPI*)(ProcessDpiAwareness);
-        auto SetProcessDpiAwarenessFunc      = reinterpret_cast<SetProcessDpiAwarenessFuncType>(
-            reinterpret_cast<void*>(GetProcAddress(shCoreDll, "SetProcessDpiAwareness")));
-
-        if (SetProcessDpiAwarenessFunc)
-        {
-            // We only check for E_INVALIDARG because we would get
-            // E_ACCESSDENIED if the DPI was already set previously
-            // and S_OK means the call was successful
-            if (SetProcessDpiAwarenessFunc(ProcessSystemDpiAware) == E_INVALIDARG)
-            {
-                sf::err() << "Failed to set process DPI awareness" << std::endl;
-            }
-            else
-            {
-                FreeLibrary(shCoreDll);
-                return;
-            }
-        }
-
-        FreeLibrary(shCoreDll);
     }
+#endif
 
-    if (user32Dll)
+    if (!SetProcessDPIAware())
     {
-        using SetProcessDPIAwareFuncType = BOOL(WINAPI*)();
+        sf::err() << "Failed to set process DPI awareness" << std::endl;
-        auto SetProcessDPIAwareFunc      = reinterpret_cast<SetProcessDPIAwareFuncType>(
-            reinterpret_cast<void*>(GetProcAddress(user32Dll, "SetProcessDPIAware")));
-
-        if (SetProcessDPIAwareFunc)
-        {
-            if (!SetProcessDPIAwareFunc())
-                sf::err() << "Failed to set process DPI awareness" << std::endl;
-        }
     }
 }
 } // namespace
@@ -221,21 +146,16 @@ m_fullscreen(false),
 m_cursorGrabbed(false)
 {
     // If we're the first window handle
-    if (handleCount == 0)
-    {
-        // Ensure User32.dll is loaded
-        if (!user32Dll)
-            user32Dll = LoadLibraryA("User32.dll");
-
-        // Set that this process is DPI aware and can handle DPI scaling
-        setProcessDpiAware();
-    }
 
     if (m_handle)
     {
-        // If we're the first window handle, we only need to poll for joysticks when WM_DEVICECHANGE message is received
+        // If we're the first window handle, set DPI Awareness
+        // plus we only need to poll for joysticks when WM_DEVICECHANGE message is received
         if (handleCount == 0)
+        {
+            setProcessDpiAware();
             JoystickImpl::setLazyUpdates(true);
+        }
 
         ++handleCount;
 
@@ -265,26 +185,20 @@ m_fullscreen((style & Style::Fullscreen) != 0),
 m_cursorGrabbed(m_fullscreen)
 {
     // If we're the first window handle
+    // Set that this process is DPI aware and can handle DPI scaling
     if (handleCount == 0)
-    {
-        // Ensure User32.dll is loaded
-        if (!user32Dll)
-            user32Dll = LoadLibraryA("User32.dll");
-
-        // Set that this process is DPI aware and can handle DPI scaling
         setProcessDpiAware();
-    }
 
     // Register the window class at first call
     if (windowCount == 0)
         registerWindowClass();
 
     // Compute position and size
-    HDC screenDC = GetDC(nullptr);
+    const HDC screenDC = GetDC(nullptr);
-    int left     = (GetDeviceCaps(screenDC, HORZRES) - static_cast<int>(mode.size.x)) / 2;
+    const int left     = (GetDeviceCaps(screenDC, HORZRES) - static_cast<int>(mode.size.x)) / 2;
-    int top      = (GetDeviceCaps(screenDC, VERTRES) - static_cast<int>(mode.size.y)) / 2;
+    const int top      = (GetDeviceCaps(screenDC, VERTRES) - static_cast<int>(mode.size.y)) / 2;
-    int width    = static_cast<int>(mode.size.x);
+    int       width    = static_cast<int>(mode.size.x);
-    int height   = static_cast<int>(mode.size.y);
+    int       height   = static_cast<int>(mode.size.y);
     ReleaseDC(nullptr, screenDC);
 
     // Choose the window style according to the Style parameter
@@ -337,21 +251,21 @@ m_cursorGrabbed(m_fullscreen)
             JoystickImpl::setLazyUpdates(true);
 
         ++handleCount;
+
+        // By default, the OS limits the size of the window the the desktop size,
+        // we have to resize it after creation to apply the real size
+        setSize(mode.size);
+
+        // Switch to fullscreen if requested
+        if (m_fullscreen)
+            switchToFullscreen(mode);
+
+        // Try to prepare touch events, if necessary
+        prepareTouch();
+
+        // Increment window count
+        ++windowCount;
     }
-
-    // By default, the OS limits the size of the window the the desktop size,
-    // we have to resize it after creation to apply the real size
-    setSize(mode.size);
-
-    // Switch to fullscreen if requested
-    if (m_fullscreen)
-        switchToFullscreen(mode);
-
-    // Try to prepare touch events, if necessary
-    prepareTouch();
-
-    // Increment window count
-    ++windowCount;
 }
 
 
@@ -370,17 +284,9 @@ WindowImplWin32::~WindowImplWin32()
         --handleCount;
 
         // This was the last handle
+        // Reenable automatic joystick polling
         if (handleCount == 0)
-        {
-            // Free User32.dll
-            if (user32Dll)
-            {
-                FreeLibrary(user32Dll);
-                user32Dll = nullptr;
-            }
-            // Reenable automatic joystick polling
             JoystickImpl::setLazyUpdates(false);
-        }
     }
 
     if (!m_callback)
@@ -895,7 +801,7 @@ void WindowImplWin32::processEvent(UINT message, WPARAM wParam, LPARAM lParam)
             position.y = static_cast<std::int16_t>(HIWORD(lParam));
             ScreenToClient(m_handle, &position);
 
-            auto delta = static_cast<std::int16_t>(HIWORD(wParam));
+            const auto delta = static_cast<std::int16_t>(HIWORD(wParam));
 
             Event event;
 
@@ -1045,8 +951,8 @@ void WindowImplWin32::processEvent(UINT message, WPARAM wParam, LPARAM lParam)
         case WM_MOUSEMOVE:
         {
             // Extract the mouse local coordinates
-            int x = static_cast<std::int16_t>(LOWORD(lParam));
+            const int x = static_cast<std::int16_t>(LOWORD(lParam));
-            int y = static_cast<std::int16_t>(HIWORD(lParam));
+            const int y = static_cast<std::int16_t>(HIWORD(lParam));
 
             // Get the client area of the window
             RECT area;
@@ -1115,7 +1021,7 @@ void WindowImplWin32::processEvent(UINT message, WPARAM wParam, LPARAM lParam)
             if ((wParam == DBT_DEVICEARRIVAL) || (wParam == DBT_DEVICEREMOVECOMPLETE))
             {
                 // Some sort of device change has happened, update joystick connections if it is a device interface
-                auto* deviceBroadcastHeader = reinterpret_cast<DEV_BROADCAST_HDR*>(lParam);
+                const auto* deviceBroadcastHeader = reinterpret_cast<DEV_BROADCAST_HDR*>(lParam);
 
                 if (deviceBroadcastHeader && (deviceBroadcastHeader->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE))
                     JoystickImpl::updateConnections();
@@ -1126,67 +1032,64 @@ void WindowImplWin32::processEvent(UINT message, WPARAM wParam, LPARAM lParam)
         case WM_TOUCH:
         {
             // Get the number of events
-            std::int16_t num = LOWORD(wParam);
+            const unsigned int count = LOWORD(wParam);
 
             // Reserve memory
-            PTOUCHINPUT events = new TOUCHINPUT[num];
+            std::vector<TOUCHINPUT> events(count);
 
-            if (events)
+            if (GetTouchInputInfo(reinterpret_cast<HTOUCHINPUT>(lParam), count, events.data(), sizeof(TOUCHINPUT)))
             {
-                if (GetTouchInputInfo(reinterpret_cast<HTOUCHINPUT>(lParam), num, events, sizeof(TOUCHINPUT)))
+                POINT point;
+                for (unsigned int i = 0; i < count; ++i)
                 {
-                    POINT point;
+                    Event event;
-                    for (int i = 0; i < num; ++i)
+                    int   index = getTouchID(events[i].dwID);
+
+                    // Out of IDs? Should never happen
+                    if (index == -1)
+                        continue;
+
+                    event.touch.finger = static_cast<unsigned int>(index);
+                    point.x            = TOUCH_COORD_TO_PIXEL(events[i].x);
+                    point.y            = TOUCH_COORD_TO_PIXEL(events[i].y);
+
+                    POINT cpoint = point;
+                    ScreenToClient(m_handle, &cpoint);
+                    event.touch.x = cpoint.x;
+                    event.touch.y = cpoint.y;
+
+                    if (events[i].dwFlags & TOUCHEVENTF_DOWN)
                     {
-                        Event event;
+                        event.type = Event::TouchBegan;
-                        int index = getTouchID(events[i].dwID);
+                        pushEvent(event);
 
-                        // Out of Ids? Should never happen
+                        // Prevent initial move event
-                        if (index == -1)
+                        touches[index] = point;
-                            continue;
+                    }
+                    if (events[i].dwFlags & TOUCHEVENTF_UP)
+                    {
+                        event.type = Event::TouchEnded;
+                        pushEvent(event);
 
-                        event.touch.finger = static_cast<unsigned int>(index);
+                        // Remove the stored ID
-                        point.x = TOUCH_COORD_TO_PIXEL(events[i].x);
+                        touchIDs[index] = static_cast<DWORD>(-1);
-                        point.y = TOUCH_COORD_TO_PIXEL(events[i].y);
+                    }
-                        
+                    if (events[i].dwFlags & TOUCHEVENTF_MOVE)
-                        POINT cpoint = point;
+                    {
-                        ScreenToClient(m_handle, &cpoint);
+                        // Only handle real movement
-                        event.touch.x = cpoint.x;
+                        if (touches[index].x != point.x || touches[index].y != point.y)
-                        event.touch.y = cpoint.y;
-                        
-                        if (events[i].dwFlags & TOUCHEVENTF_DOWN)
                         {
-                            event.type = Event::TouchBegan;
-                            pushEvent(event);
-                            
-                            // Prevent initial move event
                             touches[index] = point;
-                        }
+                            event.type     = Event::TouchMoved;
-                        if (events[i].dwFlags & TOUCHEVENTF_UP)
-                        {
-                            event.type = Event::TouchEnded;
                             pushEvent(event);
-
-                            // Remove the stored ID
-                            touchIDs[index] = static_cast<DWORD>(-1);
-                        }
-                        if (events[i].dwFlags & TOUCHEVENTF_MOVE) {
-                            // Only handle real movement
-                            if (touches[index].x != point.x || touches[index].y != point.y)
-                            {
-                                touches[index] = point;
-                                event.type = Event::TouchMoved;
-                                pushEvent(event);
-                            }
                         }
                     }
-                    CloseTouchInputHandle(reinterpret_cast<HTOUCHINPUT>(lParam));
                 }
-                else
+                CloseTouchInputHandle(reinterpret_cast<HTOUCHINPUT>(lParam));
-                {
+            }
-                    err() << "Failed to get touch input info: " << getErrorString(GetLastError()) << std::endl;
+            else
-                }
+            {
-                delete[] events;
+                err() << "Failed to get touch input info: " << getErrorString(GetLastError()) << std::endl;
             }
             break;
         }
@@ -1361,26 +1264,20 @@ void WindowImplWin32::prepareTouch()
     {
         prepared = true;
 
-#if WINVER < 0x0601
+        // Reset touch IDs
-        RegisterTouchWindow = reinterpret_cast<RegisterTouchWindowFuncType>(GetProcAddress(user32Dll, "RegisterTouchWindow"));
+        std::fill_n(touchIDs, maxTouchPoints, static_cast<DWORD>(-1));
-
-        touchEnabled = RegisterTouchWindow != nullptr;
-
-        // If we've got touch support, load the other procs
-        if (touchEnabled)
-        {
-            CloseTouchInputHandle = reinterpret_cast<CloseTouchInputHandleFuncType>(GetProcAddress(user32Dll, "CloseTouchInputHandle"));
-            GetTouchInputInfo = reinterpret_cast<GetTouchInputInfoFuncType>(GetProcAddress(user32Dll, "GetTouchInputInfo"));
-
-            // Reset touch IDs
-            for (int i = 0; i < 10; ++i)
-                touchIDs[i] = static_cast<DWORD>(-1);
-        }
-#endif
     }
 
-    if (touchEnabled && m_handle)
+    // Tell Windows this window is touch aware
-        RegisterTouchWindow(m_handle, 0);
+    RegisterTouchWindow(m_handle, 0);
+
+    // Disable right mouse button emulation by long touching
+    const ATOM atom = GlobalAddAtomA(tabletServiceProperty);
+    if (atom)
+    {
+        SetPropA(m_handle, tabletServiceProperty, reinterpret_cast<HANDLE>(tabletDisablePressAndHold));
+        GlobalDeleteAtom(atom);
+    }
 }
 
 ////////////////////////////////////////////////////////////