diff --git a/libhwcomposer/hwc_copybit.cpp b/libhwcomposer/hwc_copybit.cpp
index 47b9225..3322c21 100644
--- a/libhwcomposer/hwc_copybit.cpp
+++ b/libhwcomposer/hwc_copybit.cpp
@@ -25,7 +25,7 @@
 #include "comptype.h"
 #include "gr.h"
 #include "cb_utils.h"
-
+#include "cb_swap_rect.h"
 using namespace qdutils;
 namespace qhwc {
 
@@ -303,6 +303,9 @@
             ALOGD_IF(DEBUG_COPYBIT, "%s: Not Marked for copybit", __FUNCTION__);
             continue;
         }
+        if(layer->flags & HWC_SKIP_HWC_COMPOSITION){
+            continue;
+        }
         int ret = -1;
         if (list->hwLayers[i].acquireFenceFd != -1
                 && ctx->mMDP.version >= qdutils::MDP_V4_0) {
diff --git a/libqdutils/Android.mk b/libqdutils/Android.mk
index 06f4f00..2907ccf 100644
--- a/libqdutils/Android.mk
+++ b/libqdutils/Android.mk
@@ -13,7 +13,8 @@
 LOCAL_SRC_FILES               := profiler.cpp mdp_version.cpp \
                                  idle_invalidator.cpp \
                                  comptype.cpp qd_utils.cpp \
-                                 cb_utils.cpp display_config.cpp
+                                 cb_utils.cpp display_config.cpp \
+                                 cb_swap_rect.cpp
 include $(BUILD_SHARED_LIBRARY)
 
 include $(CLEAR_VARS)
diff --git a/libqdutils/cb_swap_rect.cpp b/libqdutils/cb_swap_rect.cpp
new file mode 100644
index 0000000..8c8efec
--- /dev/null
+++ b/libqdutils/cb_swap_rect.cpp
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2014, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above
+ *     copyright notice, this list of conditions and the following
+ *     disclaimer in the documentation and/or other materials provided
+ *     with the distribution.
+ *   * Neither the name of The Linux Foundation or the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "cb_swap_rect.h"
+
+ANDROID_SINGLETON_STATIC_INSTANCE(qdutils::cb_swap_rect);
+
+namespace qdutils {
+
+cb_swap_rect:: cb_swap_rect(){
+     swap_rect_feature_on = false ;
+}
+void cb_swap_rect::setSwapRectFeature_on( bool value){
+       swap_rect_feature_on = value ;
+}
+bool cb_swap_rect::checkSwapRectFeature_on(){
+       return swap_rect_feature_on;
+}
+
+};
diff --git a/libqdutils/cb_swap_rect.h b/libqdutils/cb_swap_rect.h
new file mode 100644
index 0000000..daaeb37
--- /dev/null
+++ b/libqdutils/cb_swap_rect.h
@@ -0,0 +1,51 @@
+/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
+* Redistribution and use in source and binary forms, with or without
+* * modification, are permitted provided that the following conditions are
+* met:
+*   * Redistributions of source code must retain the above copyrigh
+*     notice, this list of conditions and the following disclaimer
+*   * Redistributions in binary form must reproduce the above
+*     copyright notice, this list of conditions and the following
+*     disclaimer in the documentation and/or other materials provided
+*     with the distribution.
+*   * Neither the name of The Linux Foundation nor the names of its
+*     contributors may be used to endorse or promote products derived
+*     from this software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+* ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+* * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#ifndef CB_SWAP_RECT
+#define CB_SWAP_RECT
+
+#include <stdint.h>
+#include <utils/Singleton.h>
+#include <cutils/log.h>
+
+using namespace android;
+namespace qdutils {
+enum {
+HWC_SKIP_HWC_COMPOSITION = 0x00040000,
+};
+
+class cb_swap_rect : public Singleton <cb_swap_rect>
+{
+   bool swap_rect_feature_on;
+   public :
+   cb_swap_rect();
+   void setSwapRectFeature_on( bool value);
+   bool checkSwapRectFeature_on();
+};
+} // namespace qdutils
+#endif
diff --git a/libqdutils/cb_utils.cpp b/libqdutils/cb_utils.cpp
index bc7e5b1..3d07c4f 100644
--- a/libqdutils/cb_utils.cpp
+++ b/libqdutils/cb_utils.cpp
@@ -26,9 +26,10 @@
 */
 
 #include "cb_utils.h"
-
+#include "cb_swap_rect.h"
 /* get union of two rects into 3rd rect */
 void getUnion(hwc_rect_t& rect1,hwc_rect_t& rect2, hwc_rect_t& irect) {
+
     irect.left   = min(rect1.left, rect2.left);
     irect.top    = min(rect1.top, rect2.top);
     irect.right  = max(rect1.right, rect2.right);
@@ -44,11 +45,23 @@
 
     uint32_t last = list->numHwLayers - 1;
     hwc_rect_t fbFrame = list->hwLayers[last].displayFrame;
-
     Rect fbFrameRect(fbFrame.left,fbFrame.top,fbFrame.right,fbFrame.bottom);
     Region wormholeRegion(fbFrameRect);
 
-    for (uint32_t i = 0 ; i < last; i++) {
+    if(cb_swap_rect::getInstance().checkSwapRectFeature_on() == true){
+      wormholeRegion.set(0,0);
+      for(uint32_t i = 0 ; i < last; i++) {
+         if((list->hwLayers[i].blending == HWC_BLENDING_NONE) ||
+           !(layerProp[i].mFlags & HWC_COPYBIT) ||
+           (list->hwLayers[i].flags  & HWC_SKIP_HWC_COMPOSITION))
+              continue ;
+         hwc_rect_t displayFrame = list->hwLayers[i].displayFrame;
+         Rect tmpRect(displayFrame.left,displayFrame.top,
+                      displayFrame.right,displayFrame.bottom);
+         wormholeRegion.set(tmpRect);
+      }
+   }else{
+     for (uint32_t i = 0 ; i < last; i++) {
         // need to take care only in per pixel blending.
         // Restrict calculation only for copybit layers.
         if((list->hwLayers[i].blending != HWC_BLENDING_NONE) ||
@@ -59,21 +72,27 @@
         displayFrame.bottom);
         Region tmpRegion(tmpRect);
         wormholeRegion.subtractSelf(wormholeRegion.intersect(tmpRegion));
-    }
-    if (wormholeRegion.isEmpty()) {
+     }
+   }
+   if(wormholeRegion.isEmpty()){
         return 0;
-    }
-    //TO DO :- 1. remove union and call clear for each rect.
-    //      :- 2. support swap ract feature.
-    Region::const_iterator it = wormholeRegion.begin();
-    Region::const_iterator const end = wormholeRegion.end();
-    while (it != end) {
-        const Rect& r = *it++;
-        hwc_rect_t tmpWormRect = {r.left,r.top,r.right,r.bottom};
-        getUnion(clearWormholeRect, tmpWormRect, clearWormholeRect);
+   }
+   //TO DO :- 1. remove union and call clear for each rect.
+   Region::const_iterator it = wormholeRegion.begin();
+   Region::const_iterator const end = wormholeRegion.end();
+   while (it != end) {
+       const Rect& r = *it++;
+       hwc_rect_t tmpWormRect = {r.left,r.top,r.right,r.bottom};
+       int dst_w =  clearWormholeRect.right -  clearWormholeRect.left;
+       int dst_h =  clearWormholeRect.bottom -  clearWormholeRect.top;
 
-    }
-    return 1;
+       if (!(dst_w || dst_h))
+             clearWormholeRect = tmpWormRect;
+       else
+             getUnion(clearWormholeRect, tmpWormRect, clearWormholeRect);
+
+   }
+   return 1;
 }
 
 }//namespace qdutils