add cvGetPropVisible_COCOA

modules/highgui/src/precomp.hpp

@@ -114,6 +114,7 @@ double cvGetOpenGlProp_W32(const char* name);
 double cvGetOpenGlProp_GTK(const char* name);
 
 double cvGetPropVisible_W32(const char* name);
+double cvGetPropVisible_COCOA(const char* name);
 
 double cvGetPropTopmost_W32(const char* name);
 double cvGetPropTopmost_COCOA(const char* name);

modules/highgui/src/window.cpp

@@ -366,6 +366,8 @@ CV_IMPL double cvGetWindowProperty(const char* name, int prop_id)
             return cvGetPropVisible_QT(name);
         #elif defined(HAVE_WIN32UI)
             return cvGetPropVisible_W32(name);
+        #elif defined(HAVE_COCOA)
+            return cvGetPropVisible_COCOA(name);
         #else
             return -1;
         #endif

modules/highgui/src/window_cocoa.mm

@@ -740,6 +740,31 @@ void cvSetModeWindow_COCOA( const char* name, double prop_value )
     __END__;
 }
 
+double cvGetPropVisible_COCOA(const char* name)
+{
+    double    result = -1;
+    CVWindow* window = nil;
+
+    CV_FUNCNAME("cvGetPropVisible_COCOA");
+
+    __BEGIN__;
+    if (name == NULL)
+    {
+        CV_ERROR(CV_StsNullPtr, "NULL name string");
+    }
+
+    window = cvGetWindow(name);
+    if (window == NULL)
+    {
+        CV_ERROR(CV_StsNullPtr, "NULL window");
+    }
+
+    result = window.isVisible ? 1 : 0;
+
+    __END__;
+    return result;
+}
+
 double cvGetPropTopmost_COCOA(const char* name)
 {
     double    result = -1;