| RE: <<< Note 2999.0 by FRA04::HAGEMANN >>>
-< Understanding questions! >-
I recommed that you get a copy of "X Window System" by Scheifler, Gettys,
and Newman (Digital Press EY-6737E-DP ISBN 1-55558-012-2) and a copy of
"Introduction to the X Window System" by Oliver Jones (Prentice-Hall ISBN
0-13-499997-5). These books are very good references.
>> a) SHARED COLOR MAP
More to the point, shared color cells. This is a way of conserving
limited color resources. For instance, many applications allocate
pixel values to display black, white, and blue. If they all use
the shared color cells then each color only takes up one cell in the
colormap. If each application were to allocate a seperate cell then
the colormap would contain several black, white, and blue entries.
>> b) TWO COLOR SYSTEM
This usually means monochrome. Black and white (or amber, or green).
This really gets into the concepts of visuals and depths. Both books
I mentioned above goes into detail about these concepts. For instance
a monochrome workstation may have a visual of StaticGray and a depth
of 1. Where the StaticGray visual says that it can only display
black and white (or amber, or green) and the depth of 1 says that there
is only on plane.
>> c) SINGLE PLANS
I'm not real sure what you mean by this. I also assume you meant
PLANES. Workstations can have anywhere from 1 to 24 planes (some
even have more). Depending on what it is that you are trying to
accomplish you can deal with individual planes or a group of planes
when rendering graphics.
>> d) BITMAPS
Bitmaps are just like pixmaps but with a depth of 1. (A single plane).
A pixmap, like a window, is a rectangular raster area on an X
workstation, but are different from windows. One case is that pixmaps
have no background attributes (no color associations). Pixmaps don't
have (or need) borders. And there are others. Ollie's book covers
this fairly well.
Hope this offers some help.
-=> Jim <=-
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