Merge "enhance document description related to display and add return type in display...

diff --cc include/common/player.h
Simple merge

diff --cc include/wearable/player.h
Simple merge

diff --cc src/player.c
index 8325414,ac9a1ec..026b0e1
--- 1/src/player.c
--- 2/src/player.c
+++ b/src/player.c
@@@ -2408,11 -2352,13 +2425,14 @@@ int player_set_display_visible(player_
  #ifdef TIZEN_FEATURE_EVAS_RENDERER
        if (EVAS_HANDLE(pc)) {
                ret = mm_evas_renderer_set_visible(EVAS_HANDLE(pc), visible);
-               /* FIXME: need to handle error code from evas */
-               return PLAYER_ERROR_NONE;
+               if (ret != MM_ERROR_NONE) {
+                       return PLAYER_ERROR_INVALID_OPERATION;
+               } else {
+                       return PLAYER_ERROR_NONE;
+               }
        }
  #endif
 +
        player_msg_send1(api, pc, ret_buf, ret, INT, visible);
        g_free(ret_buf);
        return ret;