Need a reference to X protocol documentation for shapemask in transparent xpm

Michael Enke michael.enke at
Tue Oct 29 09:27:56 CET 2013

Hello Alan,
thank you for your comment.
I was playing with XServer for Android and created a patch to support
using the core protocol. Now the maintainer (and me too), before adding
that patch,
would like to know where to find this in the documentation.
Searching the x11protocol.pdf for "transparent" matched one place which
is not related to
Any hint?


Am 28.10.2013 16:47, schrieb Alan Coopersmith:
> The X protocol specifications are posted to:
> 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.

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