[Pkg-gmagick-im-team] Bug#940271: display: selecting the area for crop is very slow on a big image (regression)

[Vincent Lefevre]

Control: retitle -1 display: selecting the area for crop is very slow on a big image with the nouveau driver

On 2019-09-17 13:25:50 +0200, Vincent Lefevre wrote:
> On 2019-09-15 02:03:36 +0200, Vincent Lefevre wrote:
> > 1. Open a big image with "display", e.g. of size 2124x1800.
> > 2. Click on the image to make the menu appear.
> > 3. Click on "Transform", then "Crop".
> > 4. Start to select an area.
> > 
> > The rectangle flickers for several seconds (this can be more than
> > 20 seconds) to get the final selected area. This makes "crop"
> > almost unusable, and it is even impossible to do an accurate crop
> > as the area selection is no longer real time (or one needs to do
> > 2 successive crops to first reduce the image size).
> 
> If I try to do the same thing from a remote machine (i.e. same client
> machine, different X server), everything is fine.

And with a different remote machine (same network as on the above
remote machine), this is very slow, like with the local machine.
The machine where this is fast uses the nvidia driver, while the
other two machines uses the nouveau driver.

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Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)