diff --git a/libhwcomposer/hwc_copybit.cpp b/libhwcomposer/hwc_copybit.cpp
index 65482d7..68f168a 100644
--- a/libhwcomposer/hwc_copybit.cpp
+++ b/libhwcomposer/hwc_copybit.cpp
@@ -131,8 +131,10 @@
     return renderArea;
 }
 
-bool CopyBit::isLayerChanging(hwc_display_contents_1_t *list, int k) {
+bool CopyBit::isLayerChanging(hwc_context_t *ctx,
+                                 hwc_display_contents_1_t *list, int k) {
     if((mLayerCache.hnd[k] != list->hwLayers[k].handle) ||
+            (mLayerCache.drop[k] != ctx->copybitDrop[k]) ||
             (mLayerCache.displayFrame[k].left !=
                          list->hwLayers[k].displayFrame.left) ||
             (mLayerCache.displayFrame[k].top !=
@@ -161,7 +163,7 @@
     int updatingLayerCount = 0;
     for (int k = ctx->listStats[dpy].numAppLayers-1; k >= 0 ; k--){
        //swap rect will kick in only for single updating layer
-       if(isLayerChanging(list, k)) {
+       if(isLayerChanging(ctx, list, k)) {
            updatingLayerCount ++;
            if(updatingLayerCount == 1)
              changingLayerIndex = k;
@@ -1233,6 +1235,7 @@
    for (int i=0; i<ctx->listStats[dpy].numAppLayers; i++){
       hnd[i] = list->hwLayers[i].handle;
       displayFrame[i] = list->hwLayers[i].displayFrame;
+      drop[i] = ctx->copybitDrop[i];
    }
 }
 
diff --git a/libhwcomposer/hwc_copybit.h b/libhwcomposer/hwc_copybit.h
index 6ead4a7..4442afc 100644
--- a/libhwcomposer/hwc_copybit.h
+++ b/libhwcomposer/hwc_copybit.h
@@ -61,6 +61,7 @@
       int layerCount;
       buffer_handle_t hnd[MAX_NUM_APP_LAYERS];
       hwc_rect_t displayFrame[MAX_NUM_APP_LAYERS];
+      bool drop[MAX_NUM_APP_LAYERS];
       /* c'tor */
       LayerCache();
       /* clear caching info*/
@@ -135,7 +136,8 @@
                   int dpy);
     int checkDirtyRect(hwc_context_t *ctx, hwc_display_contents_1_t *list,
                   int dpy);
-    bool isLayerChanging(hwc_display_contents_1_t *list, int k);
+    bool isLayerChanging(hwc_context_t *ctx,
+                            hwc_display_contents_1_t *list, int k);
 };
 
 }; //namespace qhwc