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List:       moblin-dev
Subject:    Re: [Moblin Dev] Window transparency on Moblin OS (ClutterStage
From:       Chris Lord <chris () linux ! intel ! com>
Date:       2010-03-26 10:15:57
Message-ID: 1269598557.7788.9.camel () hand-banana
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Hey Peter,

That is right, you want both of those functions - basically, you want
something like this:


ClutterActor *stage;
ClutterColor color_with_trans = { 0xff, 0xff, 0xff, 0xa0 };

clutter_x11_set_use_argb_visual (TRUE);
clutter_init (&argc, &argv);

stage = clutter_stage_get_default ();
clutter_stage_set_use_alpha (CLUTTER_STAGE (stage), TRUE);
clutter_stage_set_color (CLUTTER_STAGE (stage), &color_with_trans);

clutter_actor_show (stage);

clutter_main ();


Note, it's important that the set_use_argb_visual be called before
clutter_init. Setting the opacity on the stage will alter the opacity of
everything drawn on it, but you can use the alpha component of a colour
to set a transparent stage background and still have fully opaque actors
on top of it (as above).

Mx's MxWindow object already calls clutter_stage_set_use_alpha, but you
still need to call clutter_x11_set_use_argb_visual (as you can see in
the test-deform-texture test).

Of course, you'll need a compositor for this to work properly (but it
does fall back gracefully).

Hope that helps,

--Chris


On Thu, 2010-03-25 at 16:15 -0700, Various Artist wrote:
> Thanks Joel and Chris for your assistance and pointers.
> 
> I believe the function I need to use for a transparent stage is the function that \
> was introduced in Clutter-1.1.6 which enables the alpha property: \
> clutter_x11_set_use_argb_visual() 
> To add to the confusion there is another function added in 1.2 which sounds similar \
> and I'm not sure what the difference is compared to the one above: \
> clutter_stage_set_use_alpha() 
> Does that seem right?
> 
> I'll be able to find out once and for all when I get my hands on the -devel \
> component for the mesa-iegd-lilbGL-4.1.moblin.i586 -- this should allow me to \
> generate the proof-of-concept prototype I am working on.   Regardless, this mailing \
> list has proven very useful and responsive :-) 
> Peter
> 
> 
> From: joel.clark@intel.com
> Date: Thu, 25 Mar 2010 15:03:43 -0600
> Subject: RE: [Moblin Dev] Window transparency on Moblin OS (ClutterStage opacity?
> 
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> These errors are exactly the kind of error you get because the –devel
> component is missing from mesa-iegd-libGL-10.3-4.1.moblin2.i586.  Because
> the –devel component is missing, it gets pulled in from mesa-libGL
> instead of mesa-iegd-libGL, and then you start getting conflicts between these
> 2 packages.  It will only work if all dependencies are resolved without pulling
> in the non-iegd mesa-libGL.
> 
> 
> 
> I'll let you know as soon as I can get you're a mesa-iegd-libGL
> with the –devel components.
> 
> 
> 
> regards
> 
> Joel
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> 		 	   		  
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