The X protocol specifications are posted to:
http://www.x.org/releases/current/doc/#protocol
The protocol itself does not cover XPM's, but requires clients to translate
images from whatever format they are stored in to the server's raw image data
format (the "picture rgb" as you call it).
If using the core protocol, "transparency" in images is indeed done with a 1
bit mask. The Render extension to the protocol allows storing translucency
information as an alpha channel in the image itself.
I don't know why you'd see the picture rgb data twice - that seems like a bug
in the software sending the data to the server.
--
-Alan Coopersmith- alan.coopersm...@oracle.com
Oracle Solaris Engineering - http://blogs.oracle.com/alanc
On 10/28/13 03:24 AM, Michael Enke wrote:
Hi all,
I want to know how transparent xpm's are exchanged between X Client and
Server.
What I've seen coming over the wire is:
a: The picture rgb
b: The shape mask
c: The picture rgb again.
1: Wonder that the shape mask uses width / 2 bytes per row, means width
* 4 bits per row
even the shapemask information is stored only in width * 1 bits per
row and the rest is discarded.
2: Why the rgb is transferred twice (a-b-c) and not only b-c or a-b?
Where I can find this in the protocol or library specifications?
Thank you,
Michael
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