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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

702.0. "XCreateWindow() depth problem" by CURIE::FORBES (Windows are panes in the glass) Sun Apr 30 1989 12:52

I am having trouble creating a window of depth 4 (or any depth != 8)
on my 8-plane DS3100.  I haven't checked if the problem exists on a VAX.
shouldn't an XCreateWindow() with depth=4 work OK for a PseudoColor device?
do I need to monkey with the visual structure entries?
If anyone has a simple sample program that uses fewer planes than its parent
window, could you post it as a reply?  thanks!

T.R Title User Personal
Name Date Lines

702.1 Depth is not arbitrary... DECWIN::FISHER Burns Fisher 381-1466, ZKO3-4/W23 Tue May 02 1989 09:16 18

T.R	Title	User	Personal Name	Date	Lines
702.1	Depth is not arbitrary...	DECWIN::FISHER	Burns Fisher 381-1466, ZKO3-4/W23	`Tue May 02 1989 09:16`	18
	You can't just arbitrarily specify any depth. The depth must be explicitly supported for the particular visual type that you are asking for. On a VAXstation/GPX, for example, you can always get depth 1 (for a pixmap only), and you can get either depth 8 or 4 depending on the hardware configuration. In the latter case, the visual type you can get is PseudoColor (or GrayScale if your system is set up as monochrome). If I remember right, the DS has lots of visual types to choose from. I don't know if they support more than depth 1 and (depth of screen). Probably not. There is usually not a good reason to. Maybe someone from Ultrix land knows this for sure, but you can check easily enough by using XVisualInfo. Burns

    You can't just arbitrarily specify any depth.  The depth must be
    explicitly supported for the particular visual type that you are asking
    for.  On a VAXstation/GPX, for example, you can always get depth 1 (for
    a pixmap only), and you can get either depth 8 or 4 depending on the
    hardware configuration.  In the latter case, the visual type you can
    get is PseudoColor (or GrayScale if your system is set up as
    monochrome).
    
    If I remember right, the DS has lots of visual types to choose from.
    I don't know if they support more than depth 1 and (depth of screen).
    Probably not.  There is usually not a good reason to.
    
    Maybe someone from Ultrix land knows this for sure, but you can check
    easily enough by using XVisualInfo.
    
    Burns