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https://issues.apache.org/jira/browse/GUACAMOLE-2234?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nick Couchman resolved GUACAMOLE-2234.
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Resolution: Fixed
Thanks [~sschiffli] !
> Transparent pixel artifacts on non-opaque layers with multiple CPU cores
> ------------------------------------------------------------------------
>
> Key: GUACAMOLE-2234
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-2234
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole-server
> Reporter: Stephen Schiffli
> Priority: Minor
>
> There exists a race condition when multiple worker threads process chunks of
> the same non-opaque layer simultaneously, each thread sends a rect+cfill pair
> to clear its region before drawing. Because rect sets per-layer path state on
> the client, concurrent threads interleave these pairs, one thread's cfill
> clears another thread's region, causing transparent artifacts in the rendered
> layer.
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