Update notes about swapping

Change-Id: I6b9f5f9c4a0bc87376a469835a50dc2cf598479e

svtools/README

@@ -3,13 +3,14 @@ Tools on top of VCL. Common dialogs, file and print dialogs, wizards, vcl filter
 
 == Image swapping ==
 
-LO has three kind of swapout mechanisms:
+LO has two kind of swapout mechanisms:
 
-1) Manual swap out calls: Maybe it comes from old days, when memory was more expensive to use so LO tried to store
-images in the memory only when it is really used and swap out them directly after use. These manual calls seems
-useless nowadays and even ineffective.
-
-2) Size based auto swapping: when the size of all graphic objects reaches a configurable limit (20 MB by default)
+1) Size based auto swapping: when the size of all graphic objects reaches a configurable limit (20 MB by default)
 then some of the graphics are saved to the local file system and freed in the memory.
+Configure: Tools -> Options -> Memory -> GraphicsCache -> Use for LibreOffice
+
+2) Time based auto swapping: after an image is swapped in / loaded a timer starts and when the timer (1 min by default)
+has a time out this image is swapped out ( sometimes this time out is ignored when the image is in use ).
+Configure: Tools -> Options -> Memory -> GraphicsCache -> Remove from memory after
 
-3) Time based auto swapping: more info needed.
+Both swapping are done by GraphicObject and GraphicManager.