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Conference bulova::decw_jan-89_to_nov-90

Title:	DECWINDOWS 26-JAN-89 to 29-NOV-90
Notice:	See 1639.0 for VMS V5.3 kit; 2043.0 for 5.4 IFT kit
Moderator:	STAR::VATNE

Created:	Mon Oct 30 1989
Last Modified:	Mon Dec 31 1990
Last Successful Update:	Fri Jun 06 1997
Number of topics:	3726
Total number of notes:	19516

2243.0. "SPX and Backing store" by CCIIS1::KRZEWINA () Fri Feb 09 1990 07:17

Note 2048.1  VAXStation 3100 Gets new High Performance Graphics Option    1 of 1

Product Description
-------------------

VAXstation 3100 SPX Color Graphics Accelerator(WS01X-GA/GB)
-----------------------------------------------------------

Features:

	o Full DECwindows support with VMS Version 5.3-1
	o 4 Mega-pixel frame buffer usable for:
		pixmaps
		double buffer
		z-buffer
----------->>>> backing store
 

        Iam using a VS3100 with SPX and VMS 5.3-1

        How the server implement the backing store ??????

        Can i write this:

        valuemask = CWBackingStore
        setwindattr.backing_store = Always 

        window = XcreateWindow (.............,valuemask, &setwinattr ) ???

        Thanks for your help

T.R	Title	User	Personal Name	Date	Lines
2243.1	no backing store in VMS V5.3	PSW::WINALSKI	Careful with that VAX, Eugene	`Fri Feb 09 1990 17:54`	8
	RE: .0 The product description says USEABLE FOR backing store. It doesn't say PROVIDES backing store. All the SPX provides is 4 megabytes of off-screen memory. How that memory gets used is up to the software. The VMS DECwindows server in VMS V5.3 does not provide backing store. --PSW
2243.2		DECWIN::FISHER	Burns Fisher 381-1466, ZKO3-4/W23	`Mon Feb 12 1990 12:58`	8
	To be more specific, you (the application) typically use Pixmaps for backing store. These are stored in the spx offscreen memory. Since it holds more than a gpx, you can have more of them there without incurring paging. Also, when the VMS server supports backing store, it will do so using the 4 Megapixels mentioned. It does not yet do so. Burns
2243.3	Which VMS version supports backingstore?	KLEE::MUELLER	Local engineering group Karlsruhe/Germany	`Wed Apr 04 1990 11:30`	11
	Re -1 Can you tell me when (which VMS release) I can expect to use this nice feature with the X-sever of VMS. The X-server on my DECstation 3100 has no problems with backing_store = Always and save_under = true. Regards - Arndt
2243.4	Ask the product manager	STAR::VATNE	Peter Vatne, VMS Development	`Wed Apr 04 1990 14:03`	5
	> Can you tell me when (which VMS release) I can expect to use this > nice feature with the X-sever of VMS. ... As with all VMS futures, you must ask the product manager about this. The product manager for VMS DECwindows is Janis Horn, JARETH::HORN.