diff --git a/libhwcomposer/Android.mk b/libhwcomposer/Android.mk
index 5d71065..59b81e3 100644
--- a/libhwcomposer/Android.mk
+++ b/libhwcomposer/Android.mk
@@ -17,7 +17,7 @@ LOCAL_C_INCLUDES += hardware/qcom/display/liboverlay
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
 ifeq ($(TARGET_HAVE_HDMI_OUT),true)
-#LOCAL_CFLAGS += -DHDMI_DUAL_DISPLAY
+LOCAL_CFLAGS += -DHDMI_DUAL_DISPLAY
 endif
 ifeq ($(TARGET_HAVE_BYPASS),true)
 #LOCAL_CFLAGS += -DCOMPOSITION_BYPASS
diff --git a/liboverlay/overlayLib.h b/liboverlay/overlayLib.h
index fcb4904..aebb075 100755
--- a/liboverlay/overlayLib.h
+++ b/liboverlay/overlayLib.h
@@ -110,6 +110,20 @@ struct overlay_buffer_info {
     int size;
 };
 
+/* values for copybit_set_parameter(OVERLAY_TRANSFORM) */
+enum {
+    /* flip source image horizontally */
+    OVERLAY_TRANSFORM_FLIP_H    = HAL_TRANSFORM_FLIP_H,
+    /* flip source image vertically */
+    OVERLAY_TRANSFORM_FLIP_V    = HAL_TRANSFORM_FLIP_V,
+    /* rotate source image 90 degrees */
+    OVERLAY_TRANSFORM_ROT_90    = HAL_TRANSFORM_ROT_90,
+    /* rotate source image 180 degrees */
+    OVERLAY_TRANSFORM_ROT_180   = HAL_TRANSFORM_ROT_180,
+    /* rotate source image 270 degrees */
+    OVERLAY_TRANSFORM_ROT_270   = HAL_TRANSFORM_ROT_270
+};
+
 namespace overlay {
 
 enum {