[gst-devel] How to draw a rectangle onto an ximagesink?

[Stefan Kost]

hi,

Nieto, Noe M schrieb:
> Hi everybody,
> 
>  
> 
> I am writing an application where the user should be able to draw (with 
> the mouse) a rectangle on a playing video window (for now it is an 
> ximagesink).

Thats not so easy. Curretly xvimagesink does autofill-colorkey. That is it fills 
the drawable with the colorkey so that you see the video. Please file an 
enhancement request, so that xvimagesink supports a property to turn off 
autofill and another to tell you about the colorkey. Then you can fill the 
drawable yourself with the colorkey and paint your rectangle in a different 
color over it. The video will be seen where the colorkey is visible.

Stefan
> 
>  
> 
> I try the following but I see nothing drawing on the screen…
> 
> ### CONFIGURE PIPELINE TO CATCH SYNC MESSAGES
> 
> bus = self.Pipeline.get_bus()
> 
> bus.add_signal_watch()
> 
> bus.enable_sync_message_emission()
> 
> bus.connect('message', self.on_message)
> 
> bus.connect('sync-message::element', self.on_sync_message)
> 
>  
> 
>  
> 
> #############
> 
> ## Tell ximagesink to draw into the draw area that I give it, not in 
> it’s own …
> 
>     def on_sync_message(self, bus, message):
> 
>       if message.structure is None:
> 
>             return
> 
>       message_name = message.structure.get_name()
> 
>       if message_name == "prepare-xwindow-id":
> 
>             imagesink = message.src
> 
>             imagesink.set_property("force-aspect-ratio", True)
> 
>             imagesink.set_xwindow_id(self.DrawingArea.window.xid)
> 
>  
> 
> #############
> 
> ## Now, on the expose event of the drawing area, paint the rectangle 
> according to user input (mouse)
> 
> #############
> 
>     def on_DrawingAreaCamera_expose_event(self,widget,event):
> 
>         #if self.area_selection_now is True:
> 
>         context = widget.window.cairo_create()
> 
>         #widget.window.draw(context)
> 
>         context.rectangle(self.area_selection)
> 
>         context.set_source_rgb(1,0,0)
> 
>         context.stroke()
> 
>  
> 
>  
> 
> What is the right way to interact with ximagesink, so I can also draw 
> things on it’s drawable??
> 
>  
> 
> Regards
> 
>  
> 
> 
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