src/java.desktop/unix/native/libawt_xawt/awt/awt_Robot.c

*** 35,44 ****
--- 35,45 ----
  #include <X11/Xmd.h>
  #include <X11/extensions/xtestext1.h>
  #include <X11/extensions/XTest.h>
  #include <X11/extensions/XInput.h>
  #include <X11/extensions/XI.h>
+ #include <X11/extensions/Xcomposite.h>
  #include <jni.h>
  #include <sizecalc.h>
  #include "robot_common.h"
  #include "canvas.h"
  #include "wsutils.h"
*** 87,96 ****
--- 88,123 ----
      }
  
      return isXTestAvailable;
  }
  
+ static Bool hasXCompositeOverlayExtension(Display *display) {
+     int xoverlay = False;
+     int eventBase, errorBase;
+     if (XCompositeQueryExtension(display, &eventBase, &errorBase)) {
+         int major = 0;
+         int minor = 0;
+     
+         XCompositeQueryVersion(display, &major, &minor);
+         if (major > 0 || minor >= 3) {
+             xoverlay = True;
+         }
+     }
+     
+     return xoverlay;
+ }
+   
+ static jboolean isXCompositeDisplay(Display *display, int screenNumber) {
+   
+     char NET_WM_CM_Sn[25];
+     snprintf(NET_WM_CM_Sn, sizeof(NET_WM_CM_Sn), "_NET_WM_CM_S%d\0", screenNumber);
+  
+     Atom managerSelection = XInternAtom(display, NET_WM_CM_Sn, 0);
+     Window owner = XGetSelectionOwner(display, managerSelection);
+     
+     return owner != 0;
+ }
  
  static XImage *getWindowImage(Display * display, Window window,
                                int32_t x, int32_t y,
                                int32_t w, int32_t h) {
      XImage         *image;
*** 236,245 ****
--- 263,280 ----
      jint swidth = jwidth * scale;
      jint sheight = jheight * scale;
  
      rootWindow = XRootWindow(awt_display, adata->awt_visInfo.screen);
  
+     if (!isGtkSupported) {
+         if (isXCompositeDisplay(awt_display, adata->awt_visInfo.screen) &&
+             hasXCompositeOverlayExtension(awt_display))
+         {
+             rootWindow = XCompositeGetOverlayWindow(awt_display, rootWindow);
+         }
+     }
+     
      if (!XGetWindowAttributes(awt_display, rootWindow, &attr)
              || sx + swidth <= attr.x
              || attr.x + attr.width <= sx
              || sy + sheight <= attr.y
              || attr.y + attr.height <= sy) {