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

[Vincent Lefevre]

On 2019-09-15 02:03:36 +0200, Vincent Lefevre wrote:
> Package: imagemagick-6.q16
> Version: 8:6.9.10.23+dfsg-2.1+b1
> Severity: normal
> 
> 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.

-- 
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)