Merge pull request #9456 from adishavit:issue_8840/CorrectlyRestoreWindowPosOnMultipleMonitors

modules/highgui/src/window_w32.cpp

@@ -324,15 +324,34 @@ icvLoadWindowPos( const char* name, CvRect& rect )
         RegQueryValueEx(hkey, "Width", NULL, &dwType, (BYTE*)&rect.width, &dwSize);
         RegQueryValueEx(hkey, "Height", NULL, &dwType, (BYTE*)&rect.height, &dwSize);
 
-        if( rect.x != (int)CW_USEDEFAULT && (rect.x < -200 || rect.x > 3000) )
-            rect.x = 100;
-        if( rect.y != (int)CW_USEDEFAULT && (rect.y < -200 || rect.y > 3000) )
-            rect.y = 100;
-
-        if( rect.width != (int)CW_USEDEFAULT && (rect.width < 0 || rect.width > 3000) )
-            rect.width = 100;
-        if( rect.height != (int)CW_USEDEFAULT && (rect.height < 0 || rect.height > 3000) )
-            rect.height = 100;
+        // Snap rect into closest monitor in case it falls outside it. // Adi Shavit
+        // set WIN32 RECT to be the loaded size
+        POINT tl_w32 = { rect.x, rect.y };
+        POINT tr_w32 = { rect.x + rect.width, rect.y };
+
+        // find monitor containing top-left and top-right corners, or NULL
+        HMONITOR hMonitor_l = MonitorFromPoint(tl_w32, MONITOR_DEFAULTTONULL);
+        HMONITOR hMonitor_r = MonitorFromPoint(tr_w32, MONITOR_DEFAULTTONULL);
+
+        // if neither are contained - the move window to origin of closest.
+        if (NULL == hMonitor_l && NULL == hMonitor_r)
+        {
+           // find monitor nearest to top-left corner
+           HMONITOR hMonitor_closest = MonitorFromPoint(tl_w32, MONITOR_DEFAULTTONEAREST);
+
+           // get coordinates of nearest monitor
+           MONITORINFO mi;
+           mi.cbSize = sizeof(mi);
+           GetMonitorInfo(hMonitor_closest, &mi);
+
+           rect.x = mi.rcWork.left;
+           rect.y = mi.rcWork.top;
+        }
+
+        if (rect.width != (int)CW_USEDEFAULT && (rect.width < 0 || rect.width > 3000))
+           rect.width = 100;
+        if (rect.height != (int)CW_USEDEFAULT && (rect.height < 0 || rect.height > 3000))
+           rect.height = 100;
 
         RegCloseKey(hkey);
     }