diff --git a/glamor/glamor_core.c b/glamor/glamor_core.c
index 395e91276..01c9aeaf9 100644
--- a/glamor/glamor_core.c
+++ b/glamor/glamor_core.c
@@ -263,8 +263,6 @@ glamor_fini_finish_access_shaders(ScreenPtr screen)
 	dispatch->glDeleteProgram(glamor_priv->finish_access_prog[1]);
 }
 
-
-
 void
 glamor_finish_access(DrawablePtr drawable, glamor_access_t access_mode)
 {
@@ -275,7 +273,7 @@ glamor_finish_access(DrawablePtr drawable, glamor_access_t access_mode)
 	    glamor_get_screen_private(drawable->pScreen);
 	glamor_gl_dispatch *dispatch = &glamor_priv->dispatch;
 
-	if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(pixmap_priv))
+	if (!GLAMOR_PIXMAP_PRIV_HAS_FBO_DOWNLOADED(pixmap_priv))
 		return;
 
 	if (access_mode != GLAMOR_ACCESS_RO) {
@@ -293,6 +291,9 @@ glamor_finish_access(DrawablePtr drawable, glamor_access_t access_mode)
 		free(pixmap->devPrivate.ptr);
 	}
 
+	if (pixmap_priv->gl_fbo == GLAMOR_FBO_DOWNLOADED)
+		pixmap_priv->gl_fbo = GLAMOR_FBO_NORMAL;
+
 	pixmap->devPrivate.ptr = NULL;
 }
 
diff --git a/glamor/glamor_pixmap.c b/glamor/glamor_pixmap.c
index e1542732b..6563e949b 100644
--- a/glamor/glamor_pixmap.c
+++ b/glamor/glamor_pixmap.c
@@ -641,7 +641,6 @@ glamor_es2_pixmap_read_prepare(PixmapPtr source, GLenum * format,
  * If successfully download a fbo to cpu then return TRUE.
  * Otherwise return FALSE.
  **/
-
 Bool
 glamor_download_pixmap_to_cpu(PixmapPtr pixmap, glamor_access_t access)
 {
@@ -794,6 +793,8 @@ glamor_download_pixmap_to_cpu(PixmapPtr pixmap, glamor_access_t access)
 
 	dispatch->glBindFramebuffer(GL_FRAMEBUFFER, 0);
       done:
+
+	pixmap_priv->gl_fbo = GLAMOR_FBO_DOWNLOADED;
 	pixmap->devPrivate.ptr = data;
 
 	if (temp_pixmap)
diff --git a/glamor/glamor_priv.h b/glamor/glamor_priv.h
index 0b7558836..b19a30402 100644
--- a/glamor/glamor_priv.h
+++ b/glamor/glamor_priv.h
@@ -243,19 +243,23 @@ typedef union _glamor_pending_op {
 	glamor_pending_fill fill;
 } glamor_pending_op;
 
-/*
- * glamor_pixmap_private - glamor pixmap's private structure.
- * @gl_fbo:  The pixmap is attached to a fbo originally.
- * @gl_tex:  The pixmap is in a gl texture originally.
+#define GLAMOR_FBO_NORMAL     1
+#define GLAMOR_FBO_DOWNLOADED 2
+/* glamor_pixmap_fbo:
+ * @list:    to be used to link to the cache pool list.
+ * @expire:  when push to cache pool list, set a expire count.
+ * 	     will be freed when glamor_priv->tick is equal or
+ * 	     larger than this expire count in block handler.
  * @pbo_valid: The pbo has a valid copy of the pixmap's data.
- * @is_picture: The drawable is attached to a picture.
  * @tex:     attached texture.
  * @fb:      attached fbo.
  * @pbo:     attached pbo.
- * @pict_format: the corresponding picture's format.
- * #pending_op: currently only support pending filling.
- * @container: The corresponding pixmap's pointer.
- **/
+ * @width:   width of this fbo.
+ * @height:  height of this fbo.
+ * @format:  internal format of this fbo's texture.
+ * @type:    internal type of this fbo's texture.
+ * @glamor_priv: point to glamor private data.
+ */
 typedef struct glamor_pixmap_fbo {
 	struct list list;
 	unsigned int expire;
@@ -270,9 +274,22 @@ typedef struct glamor_pixmap_fbo {
 	glamor_screen_private *glamor_priv;
 } glamor_pixmap_fbo;
 
-
+/*
+ * glamor_pixmap_private - glamor pixmap's private structure.
+ * @gl_fbo:
+ * 	0 		  	- The pixmap doesn't has a fbo attached to it.
+ * 	GLAMOR_FBO_NORMAL 	- The pixmap has a fbo and can be accessed normally.
+ * 	GLAMOR_FBO_DOWNLOADED 	- The pixmap has a fbo and already downloaded to
+ * 				  CPU, so it can only be treated as a in-memory pixmap
+ * 				  if this bit is set.
+ * @gl_tex:  The pixmap is in a gl texture originally.
+ * @is_picture: The drawable is attached to a picture.
+ * @pict_format: the corresponding picture's format.
+ * #pending_op: currently only support pending filling.
+ * @container: The corresponding pixmap's pointer.
+ **/
 typedef struct glamor_pixmap_private {
-	unsigned char gl_fbo:1;
+	unsigned char gl_fbo:2;
 	unsigned char is_picture:1;
 	unsigned char gl_tex:1;
 	glamor_pixmap_type_t type;
diff --git a/glamor/glamor_utils.h b/glamor/glamor_utils.h
index b29292832..a60b146c1 100644
--- a/glamor/glamor_utils.h
+++ b/glamor/glamor_utils.h
@@ -175,7 +175,8 @@ glamor_transform_boxes(BoxPtr boxes, int nbox, int dx, int dy)
 
 
 #define GLAMOR_PIXMAP_PRIV_IS_PICTURE(pixmap_priv) (pixmap_priv && pixmap_priv->is_picture == 1)
-#define GLAMOR_PIXMAP_PRIV_HAS_FBO(pixmap_priv)    (pixmap_priv && pixmap_priv->gl_fbo == 1)
+#define GLAMOR_PIXMAP_PRIV_HAS_FBO(pixmap_priv)    (pixmap_priv && pixmap_priv->gl_fbo == GLAMOR_FBO_NORMAL)
+#define GLAMOR_PIXMAP_PRIV_HAS_FBO_DOWNLOADED(pixmap_priv)    (pixmap_priv && (pixmap_priv->gl_fbo == GLAMOR_FBO_DOWNLOADED))
 
 #define GLAMOR_PIXMAP_PRIV_NEED_VALIDATE(pixmap_priv)  \
 	(GLAMOR_PIXMAP_PRIV_HAS_FBO(pixmap_priv) \