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Re: [Qemu-devel] [PATCH] gtk: Keep the pointer within window during inpu
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From: |
Gerd Hoffmann |
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Subject: |
Re: [Qemu-devel] [PATCH] gtk: Keep the pointer within window during input grab |
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Date: |
Fri, 11 Apr 2014 15:07:34 +0200 |
On Di, 2014-04-08 at 14:46 +0200, Takashi Iwai wrote:
> The current code shows annoying behavior where the X pointer can move
> out of the window during the input grab in the absolute mode. Due to
> this, the pointer in qemu window looks as if frozen until the real
> (invisible) X pointer comes back to the window again.
>
> For avoiding such an unexpected lag, this patch limits the pointer
> movement only within the qemu window during the input grab in the
> absolute mode. When the pointer goes out, it's moved back to the
> boundary again.
At least at X11 level it is possible to simply confine the pointer to a
certain window (see "man XGrabPointer"). Then you don't have to warp
the pointer. Warping the pointer in absolute mode has ugly effects (see
2bda66028b4962c36d4eabe2995edab12df93691).
Other possible solution: Never ever grab the pointer in absolute mode.
cheers,
Gerd