Thank you very much, Carsten. This explains why they have used the XShm
functions and the purpose of grabsharedmemory().
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So, in X11,
A Colormap consists of a set of entries defining color values (I thought
this would be called a "palette").
A Visual manages the color resources but doesn't configure the color
depth, it sets colors in accordance with the current color depth of the
Screen and Colormap of the Visu
From the Xlib - C Language X Interface: "For each screen of the
display, there may be a list of valid visual types supported at
different depths of the screen."
Alright this is confusing me, this implies that one screen can handle
windows with 8, 16, 24, 32 bits color depth at the same time an
From the Xlib - C Language X Interface: "For each screen of the
display, there may be a list of valid visual types supported at
different depths of the screen."
Alright this is confusing me, this implies that one screen can handle
windows with 8, 16, 24, 32 bits color depth at the same time an
The X protocol spec has a glossary at:
https://www.x.org/releases/current/doc/xproto/x11protocol.html#glossary
The Xlib API spec also has a glossary at:
https://www.x.org/releases/current/doc/libX11/libX11/libX11.html#glossary
More detailed definitions are found in the bodies of each document.
