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From "Michael Jumper (JIRA)" <>
Subject [jira] [Resolved] (GUACAMOLE-282) Common surface transfer functions incorrect with respect to alpha channel
Date Thu, 27 Apr 2017 03:53:04 GMT


Michael Jumper resolved GUACAMOLE-282.
       Resolution: Fixed
    Fix Version/s: 0.9.13-incubating

> Common surface transfer functions incorrect with respect to alpha channel
> -------------------------------------------------------------------------
>                 Key: GUACAMOLE-282
>                 URL:
>             Project: Guacamole
>          Issue Type: Bug
>          Components: guacamole-server
>    Affects Versions: 0.9.12-incubating
>            Reporter: Michael Jumper
>            Assignee: Michael Jumper
>            Priority: Critical
>             Fix For: 0.9.13-incubating
> 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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