[enhancement]: Improve viewport zoom scaling quality (reduce aliasing)

[Kahldris]

Is there an existing issue for this?

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What should this feature add?

Just a quick observation/suggestion regarding the image display when zooming in the canvas/viewer. I immediately noticed that at zoom levels other than 100%, images (especially with lineart) can look quite aliased or "jaggy" (see attached image comparing with how Photoshop handles it).

I guess Invoke is just using nearest-neighbor scaling, rather than something like bilinear/bicubic filtering which helps smooth things out. It can make it a bit tricky to work with finer details when not at 100% zoom and gets a bit annoying having to always reset it back to 100% to properly assess quality.

I couldn't find any discussion about it so I don't know if there's a way to enable better filtering that I missed. Apps like Nvidia ICAT default to nearest neighbor but have a toggle for bilinear which would be great here. I don't know if there's a technical limitation but I'd love if better viewport scaling could be considered for a future update. Love the tool otherwise!

Cheers

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