Stephen Schiffli created GUACAMOLE-2234:
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Summary: 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
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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