Bug 302781 Splash screen should fade in on Win2k+

r=ere sr=neil a=asa

xpfe/bootstrap/nsNativeAppSupportWin.cpp

@@ -104,6 +104,14 @@ struct JSContext;
 
 #define MAPI_STARTUP_ARG       "/MAPIStartUp"
 
+#ifndef LWA_ALPHA
+#define LWA_ALPHA 2
+#endif
+
+#ifndef WS_EX_LAYERED
+#define WS_EX_LAYERED 0x80000
+#endif
+
 static HWND hwndForDOMWindow( nsISupports * );
 
 static
@@ -156,6 +164,8 @@ activateWindow( nsIDOMWindowInternal *win ) {
 #define MOZ_DEBUG_DDE 1
 #endif
 
+typedef BOOL (WINAPI *MOZ_SetLayeredWindowAttributesProc)(HWND, COLORREF, BYTE, DWORD);
+
 class nsSplashScreenWin : public nsISplashScreen {
 public:
     nsSplashScreenWin();
@@ -204,10 +214,15 @@ public:
 
     static BOOL CALLBACK DialogProc( HWND dlg, UINT msg, WPARAM wp, LPARAM lp );
     static DWORD WINAPI ThreadProc( LPVOID );
+    static VOID CALLBACK TimerProc(HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime);
 
     HWND mDlg;
     HBITMAP mBitmap;
     nsrefcnt mRefCnt;
+
+    static int mOpacity;
+    static MOZ_SetLayeredWindowAttributesProc mSetLayeredWindowAttributesProc;
+
 }; // class nsSplashScreenWin
 
 // Simple Win32 mutex wrapper.
@@ -425,6 +440,7 @@ nsSplashScreenWin::~nsSplashScreenWin() {
 #if MOZ_DEBUG_DDE
     printf( "splash screen dtor called\n" );
 #endif
+    KillTimer(mDlg, 0);
     // Make sure dialog is gone.
     Hide();
 }
@@ -501,6 +517,20 @@ nsSplashScreenWin::LoadBitmap() {
     }
 }
 
+int nsSplashScreenWin::mOpacity = 55;
+MOZ_SetLayeredWindowAttributesProc nsSplashScreenWin::mSetLayeredWindowAttributesProc = 0;
+
+VOID CALLBACK
+nsSplashScreenWin::TimerProc(HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime) {
+    mOpacity += 20;
+    if (mOpacity >= 255) { // >= because we still want to kill the timer for 255
+        mOpacity = 255;
+        KillTimer(hwnd, 0);
+    }
+    // no need to null check - this code can't be reached if SetLayeredWindowAttributes isn't available
+    mSetLayeredWindowAttributesProc(hwnd, 0, mOpacity, LWA_ALPHA);
+}
+
 BOOL CALLBACK
 nsSplashScreenWin::DialogProc( HWND dlg, UINT msg, WPARAM wp, LPARAM lp ) {
     if ( msg == WM_INITDIALOG ) {
@@ -509,6 +539,16 @@ nsSplashScreenWin::DialogProc( HWND dlg, UINT msg, WPARAM wp, LPARAM lp ) {
         if ( lp ) {
             splashScreen->SetDialog( dlg );
 
+            HMODULE user32lib = GetModuleHandle("user32.dll");
+            mSetLayeredWindowAttributesProc = (MOZ_SetLayeredWindowAttributesProc) GetProcAddress(user32lib, "SetLayeredWindowAttributes");
+            if (mSetLayeredWindowAttributesProc) {
+                SetWindowLongPtr(dlg, GWL_EXSTYLE,
+                                 GetWindowLongPtr(dlg, GWL_EXSTYLE) | WS_EX_LAYERED);
+                mSetLayeredWindowAttributesProc(dlg, 0,
+                                                  mOpacity, LWA_ALPHA);
+                SetTimer(dlg, 0, 10, TimerProc);
+            }
+
             // Try to load customized bitmap.
             splashScreen->LoadBitmap();
         }