report the capability of vaCopy support

Signed-off-by: Carl Zhang <carl.zhang@intel.com>

Author: XinfengZhang

va/va.h

@@ -4835,6 +4835,15 @@ VAStatus vaDeassociateSubpicture (
  * brightness etc. in the rendering process.  The application can query what
  * attributes are supported by the driver, and then set the appropriate attributes
  * before calling vaPutSurface()
+ *
+ * Display attributes also are used to query/set display adaptor (vaDisplay) related information.
+ * These attributes do not depend on vaConfig, only related with platform or display adaptor
+ * They could not be used for vaPutSurface.
+ * App could call vaQueryDisplayAttributes/vaGetDisplayAttributes to query these attributes
+ * at anytime after vaInitialize, but only could call vaSetDisplayAttributes for these attributes
+ * after vaInitialize and before any other function call if the attributes is settable.
+ * To distinguish these two types of display attributes, this display adaptor related attributes
+ * should be marked as "HW attribute" in the description.
  */
 /* PowerVR IEP Lite attributes */
 typedef enum
@@ -4957,6 +4966,12 @@ typedef enum
      * specify vaPutSurface render area if there is no drawable on the monitor
      */
     VADisplayAttribRenderRect          = 18,
+    /*
+     * HW attribute. read only. specify whether vaCopy support on current HW
+     * The value of each bit should equal to 1 << VA_EXEC_MODE_XXX to represent
+     * modes of vaCopy
+     */
+    VADisplayAttribCopy                 = 19,
 } VADisplayAttribType;
 
 /* flags for VADisplayAttribute */