depth in pixmap

[Harold L Hunt II]

Kris,

You gathered correctly.

The depth parameter is only used in fullscreen mode where we can 
actually change the display depth to match the requested depth.  In 
windowed mode we are stuck with the display depth that Windows is 
currently running at.

Other X Servers support 8 bit visuals on top of 24 bit visuals, but 
Cygwin/XFree86 does not currently have this support.  There is an 
experimental feature (enabled with -pseudoemulation, I think) that 
creates an 8 bit visual, however, this visual does not have a real 
colormap and we do not translate between colormap colors and 24 bit 
colors... in other words, the colors will be all messed up, but you may 
find this acceptable.

Harold

Thielemans, Kris wrote:

>Hi,
>
>do I gather correctly from the FAQ that it is impossible to open an depth 8
>window and display and 8 depth ZPixmap on a 24 bit depth screen?
>
>It seems that the depth settings are largerly ignored (aside from size
>issues). That is, I don't seem to get an error message at all when I ask for
>8bit depth, but then it does not seem to work properly.
>
>
>Is this a general restrictiion of X servers, or only of XFree on Windows?
>
>
>Oh, while I'm taking some bandwith here. Can anybody point me to some online
>documentation on how to put up a bitmap in 24bit mode? (I'm constructing my
>bitmap myself, and do that in 8bit mode with ZPixmap that essentially
>indexes in a colormap, but I get the impression that my ZPixmap has to be
>24bit per pixel now. What format is it in? Is the colormap ignored?)
>
>
>Thanks for any help!
>
>Kris Thielemans
>  
>