Windows QPA: Directly link against touch functions

They are available on Windows 7.

Change-Id: Ia937c459fe0df0d39d407ca0e65641f8aa583f4a
Reviewed-by: Jake Petroules <jake.petroules@qt.io>

src/plugins/platforms/windows/qwindowscontext.cpp

@@ -198,19 +198,6 @@ void QWindowsUser32DLL::init()
     }
 }
 
-bool QWindowsUser32DLL::initTouch()
-{
-    if (!isTouchWindow && QSysInfo::windowsVersion() >= QSysInfo::WV_WINDOWS7) {
-        QSystemLibrary library(QStringLiteral("user32"));
-        isTouchWindow = (IsTouchWindow)(library.resolve("IsTouchWindow"));
-        registerTouchWindow = (RegisterTouchWindow)(library.resolve("RegisterTouchWindow"));
-        unregisterTouchWindow = (UnregisterTouchWindow)(library.resolve("UnregisterTouchWindow"));
-        getTouchInputInfo = (GetTouchInputInfo)(library.resolve("GetTouchInputInfo"));
-        closeTouchInputHandle = (CloseTouchInputHandle)(library.resolve("CloseTouchInputHandle"));
-    }
-    return isTouchWindow && registerTouchWindow && unregisterTouchWindow && getTouchInputInfo && closeTouchInputHandle;
-}
-
 void QWindowsShcoreDLL::init()
 {
     if (QOperatingSystemVersion::current() < QOperatingSystemVersion::Windows8_1)
@@ -267,7 +254,7 @@ QWindowsContextPrivate::QWindowsContextPrivate()
     QWindowsContext::user32dll.init();
     QWindowsContext::shcoredll.init();
 
-    if (m_mouseHandler.touchDevice() && QWindowsContext::user32dll.initTouch())
+    if (m_mouseHandler.touchDevice())
         m_systemInfo |= QWindowsContext::SI_SupportsTouch;
     m_displayContext = GetDC(0);
     m_defaultDPI = GetDeviceCaps(m_displayContext, LOGPIXELSY);
@@ -325,11 +312,6 @@ bool QWindowsContext::initTouch(unsigned integrationOptions)
     if (!touchDevice)
         return false;
 
-    if (!QWindowsContext::user32dll.initTouch()) {
-        delete touchDevice;
-        return false;
-    }
-
     if (!(integrationOptions & QWindowsIntegration::DontPassOsMouseEventsSynthesizedFromTouch))
         touchDevice->setCapabilities(touchDevice->capabilities() | QTouchDevice::MouseEmulation);
 

src/plugins/platforms/windows/qwindowscontext.h

@@ -84,13 +84,7 @@ class QTouchDevice;
 struct QWindowsUser32DLL
 {
     inline void init();
-    inline bool initTouch();
 
-    typedef BOOL (WINAPI *IsTouchWindow)(HWND, PULONG); // Windows 7
-    typedef BOOL (WINAPI *RegisterTouchWindow)(HWND, ULONG);
-    typedef BOOL (WINAPI *UnregisterTouchWindow)(HWND);
-    typedef BOOL (WINAPI *GetTouchInputInfo)(HANDLE, UINT, PVOID, int);
-    typedef BOOL (WINAPI *CloseTouchInputHandle)(HANDLE);
     typedef BOOL (WINAPI *SetProcessDPIAware)();
     typedef BOOL (WINAPI *AddClipboardFormatListener)(HWND);
     typedef BOOL (WINAPI *RemoveClipboardFormatListener)(HWND);
@@ -100,13 +94,6 @@ struct QWindowsUser32DLL
     typedef int  (WINAPI *GetWindowDpiAwarenessContext)(HWND);
     typedef int  (WINAPI *GetAwarenessFromDpiAwarenessContext)(int);
 
-    // Touch functions from Windows 7 onwards (also for use with Q_CC_MSVC).
-    IsTouchWindow isTouchWindow = nullptr;
-    RegisterTouchWindow registerTouchWindow = nullptr;
-    UnregisterTouchWindow unregisterTouchWindow = nullptr;
-    GetTouchInputInfo getTouchInputInfo = nullptr;
-    CloseTouchInputHandle closeTouchInputHandle = nullptr;
-
     // Windows Vista onwards
     SetProcessDPIAware setProcessDPIAware = nullptr;
 

src/plugins/platforms/windows/qwindowsmousehandler.cpp

@@ -37,6 +37,13 @@
 **
 ****************************************************************************/
 
+#if defined(WINVER) && WINVER < 0x0601
+#  undef WINVER
+#endif
+#if !defined(WINVER)
+#  define WINVER 0x0601 // Enable touch functions for MinGW
+#endif
+
 #include "qwindowsmousehandler.h"
 #include "qwindowskeymapper.h"
 #include "qwindowscontext.h"
@@ -56,37 +63,6 @@
 
 #include <windowsx.h>
 
-/* Touch is supported from Windows 7 onwards and data structures
- * are present in the Windows SDK's, but not in older MSVC Express
- * versions. */
-
-#if defined(Q_CC_MINGW) || !defined(TOUCHEVENTF_MOVE)
-
-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 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_PALM 0x0080
-#  define TOUCHINPUTMASKF_CONTACTAREA 0x0004
-#  define TOUCHINPUTMASKF_EXTRAINFO 0x0002
-#endif // if defined(Q_CC_MINGW) || !defined(TOUCHEVENTF_MOVE)
-
 QT_BEGIN_NAMESPACE
 
 static inline void compressMouseMove(MSG *msg)
@@ -522,9 +498,8 @@ bool QWindowsMouseHandler::translateTouchEvent(QWindow *window, HWND,
     touchPoints.reserve(winTouchPointCount);
     Qt::TouchPointStates allStates = 0;
 
-    QWindowsContext::user32dll.getTouchInputInfo(reinterpret_cast<HANDLE>(msg.lParam),
+    GetTouchInputInfo(reinterpret_cast<HTOUCHINPUT>(msg.lParam),
-                                                 UINT(msg.wParam),
+                      UINT(msg.wParam), winTouchInputs.data(), sizeof(TOUCHINPUT));
-                                                 winTouchInputs.data(), sizeof(TOUCHINPUT));
     for (int i = 0; i < winTouchPointCount; ++i) {
         const TOUCHINPUT &winTouchInput = winTouchInputs[i];
         int id = m_touchInputIDToTouchPointID.value(winTouchInput.dwID, -1);
@@ -565,7 +540,7 @@ bool QWindowsMouseHandler::translateTouchEvent(QWindow *window, HWND,
         touchPoints.append(touchPoint);
     }
 
-    QWindowsContext::user32dll.closeTouchInputHandle(reinterpret_cast<HANDLE>(msg.lParam));
+    CloseTouchInputHandle(reinterpret_cast<HTOUCHINPUT>(msg.lParam));
 
     // all touch points released, forget the ids we've seen, they may not be reused
     if (allStates == Qt::TouchPointReleased)

src/plugins/platforms/windows/qwindowswindow.cpp

@@ -37,6 +37,13 @@
 **
 ****************************************************************************/
 
+#if defined(WINVER) && WINVER < 0x0601
+#  undef WINVER
+#endif
+#if !defined(WINVER)
+#  define WINVER 0x0601 // Enable touch functions for MinGW
+#endif
+
 #include "qwindowswindow.h"
 #include "qwindowscontext.h"
 #if QT_CONFIG(draganddrop)
@@ -1110,7 +1117,7 @@ QWindowsWindow::~QWindowsWindow()
 {
     setFlag(WithinDestroy);
     if (testFlag(TouchRegistered))
-        QWindowsContext::user32dll.unregisterTouchWindow(m_data.hwnd);
+        UnregisterTouchWindow(m_data.hwnd);
     destroyWindow();
     destroyIcon();
 }
@@ -2585,12 +2592,12 @@ void QWindowsWindow::registerTouchWindow(QWindowsWindowFunctions::TouchWindowTou
     if ((QWindowsContext::instance()->systemInfo() & QWindowsContext::SI_SupportsTouch)
         && !testFlag(TouchRegistered)) {
         ULONG touchFlags = 0;
-        const bool ret = QWindowsContext::user32dll.isTouchWindow(m_data.hwnd, &touchFlags);
+        const bool ret = IsTouchWindow(m_data.hwnd, &touchFlags);
         // Return if it is not a touch window or the flags are already set by a hook
         // such as HCBT_CREATEWND
         if (ret || touchFlags != 0)
             return;
-        if (QWindowsContext::user32dll.registerTouchWindow(m_data.hwnd, ULONG(touchTypes)))
+        if (RegisterTouchWindow(m_data.hwnd, ULONG(touchTypes)))
             setFlag(TouchRegistered);
         else
             qErrnoWarning("RegisterTouchWindow() failed for window '%s'.", qPrintable(window()->objectName()));