Input transformations: Compiz

[Bipin George Mathew]

Thanks Joel. This mostly clear things. btw, where did is this comment found?
I grep'ed through the compiz 0.7.8 code (
http://packages.ubuntu.com/source/intrepid/compiz) and could not find such a
comment. Beryl's code perhaps?

Chris,

You mentioned that the XServer needs rework - do you know what the nature of
the rework is and why it is needed?

Thanks!
-Bipin

On Tue, Jan 20, 2009 at 8:01 PM, Joel Bosveld <joel.bosveld at gmail.com>wrote:

> On Wed, Jan 21, 2009 at 11:57 AM, Bipin George Mathew <bipingm at gmail.com>wrote:
>
>> Given that the upstream compiz does not use David's APIs, how is the
>> zoom plugin able to translate the co-ordinates for ButtonPress?
>>
>> While looking at the compiz code, I did find XGrabButton was called on
>> each window created to intercept the events; but I was expecting an
>> XSendEvent with the ButtonPressMask to be called with the transformed
>> co-ordinates- which I not find. Also, I read on the mailinglist that
>> clients can ignore synth events of XSendEvent.
>> Any pointers on how this translation is done?
>>
>
>
> From the comments at the top of the code:
>
>  Note on input
>
>  We can not redirect input yet, but this plug-in offers two fundamentally different
> approaches to achieve input enabled zoom:
>
>
> 1. Always have the zoomed area be in sync with the mouse cursor. This
> binds the zoom area to the mouse position at any given time. It allows using
> the original mouse cursor drawn by X, and is technically very safe. First
> used in Beryl's inputzoom.
>
>
> 2. Hide the real cursor and draw our own where it would be when zoomed in.
> This allows us to navigate with the mouse without constantly moving the zoom
> area. This is fairly close to what we want in the end when input redirection
> is available.
>
>
> This second method has one huge issue, which is bugged XFixes. After hiding
> the cursor once with XFixes, some mouse cursors will simply be invisible.
> The Firefox loading cursor being one of them. An other minor annoyance is
> that mouse sensitivity seems to increase as
> you zoom in, since the mouse isn't really zoomed at all.
>
>
>
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