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https://issues.apache.org/jira/browse/GUACAMOLE-211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15884444#comment-15884444
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Michael Jumper commented on GUACAMOLE-211:
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This is due to the switch to the internal common surface structure, which has
historically supported only opaque images. The cursor used to be sent using raw
Guacamole protocol, and thus the alpha channel was preserved, but switching
over to the internal common surface implementation obliterated the alpha
channel.
Recent work on GUACAMOLE-168 via GUACAMOLE-188 added alpha support to the
common surface, though, so this should be fixable with minimal changes.
> RDP mouse cursor shadow black
> -----------------------------
>
> Key: GUACAMOLE-211
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-211
> Project: Guacamole
> Issue Type: Bug
> Components: guacd
> Affects Versions: 0.9.10-incubating, 0.9.11-incubating
> Environment: guacd connecting to Windows Server 2012
> Reporter: Roman Stoffel
> Assignee: Michael Jumper
> Attachments: shadow-0.9.10.png, shadow-0.9.9.png
>
>
> Since guacd 0.9.10-incubating the mouse cursor shadow is a thick black shadow
> instead of transparent. Running guac as docker image.
> Broken cursor shadow:
> {code:none}
> $ docker run --name guacd -p 4822:4822 -d glyptodon/guacd:0.9.10-incubating
> {code}
> Correct cursor shadow:
> {code:none}
> $ docker run --name guacd -p 4822:4822 -d glyptodon/guacd:0.9.9
> {code}
> See attached screen shots.
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