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 <[email protected]>wrote: > On Wed, Jan 21, 2009 at 11:57 AM, Bipin George Mathew > <[email protected]>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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