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bug#65432: 30.0.50; jerky image movements when zoomed
From: |
Manuel Giraud |
Subject: |
bug#65432: 30.0.50; jerky image movements when zoomed |
Date: |
Thu, 24 Aug 2023 15:48:55 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) |
Po Lu <luangruo@yahoo.com> writes:
[...]
>> I cannot reproduce this, on MS-Windows. I see no difference between
>> "jerkyness" of motion commands before and after 'i -'.
>
> This is a known inefficiency with Cairo's implementation of affine
> transforms. AFAICT, Cairo performs the transform on the CPU, which is
> aggravated by uploading the complete bitmap to the X server every time
> the image is displayed.
>
> Building without Cairo should induce Emacs to utilize XRender transforms
> instead, ameliorating this problem.
Thanks, I'm going to try without Cairo. But would it be possible to
have Emacs using cairo for everything except for raster images?
--
Manuel Giraud