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https://issues.apache.org/jira/browse/GUACAMOLE-282?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Jumper reassigned GUACAMOLE-282:
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Assignee: Michael Jumper
> Common surface transfer functions incorrect with respect to alpha channel
> -------------------------------------------------------------------------
>
> Key: GUACAMOLE-282
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-282
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole-server
> Affects Versions: 0.9.12-incubating
> Reporter: Michael Jumper
> Assignee: Michael Jumper
> Priority: Critical
>
> The common surface implementation used within guacamole-server is incorrect
> with respect to binary transfer functions as of GUACAMOLE-188, which added
> support for the alpha channel to the common surface.
> Prior to GUACAMOLE-188, the common surface supported only the red, green, and
> blue channels, thus simple binary operations correctly mirrored those of the
> JavaScript Guacamole client.
> After GUACAMOLE-188, the contents of a surface might have alpha channel
> values, which are not supposed to be taken into account for all transfer
> functions. The JavaScript client actually only pays attention to the alpha
> channel for the following transfer functions:
> * {{GUAC_TRANSFER_BINARY_SRC}} (alpha channel becomes a copy of source)
> * {{GUAC_TRANSFER_BINARY_NSRC}} (alpha channel becomes a copy of source and
> is NOT INVERTED)
> In all other cases, the alpha channel of the destination is preserved.
> The common surface must be modified to duplicate this behavior.
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