feat: (iOS) Apply trilinear filtering to smooth out missized images

[zarv1k]

Summary:

This PR improves quality of missized images by applying a trilinear filter.

Changelog:

• [IOS] [ADDED] - Apply trilinear filtering to smooth out missized images

Test Plan:

Use large image in smaller container view. Before update you can see that the straight lines are stepped, which is really noticeable. After this update image the straight lines on the image look much better as on screenshots below:

Before:

After:

[orca-security-in]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

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[devanshsaini11]

Hi @zarv1k
Thanks for raising this PR, have you tested trilinear filter for magnification i.e small images in larger containers. Trilinear filtering can sometimes make upscaled images appear slightly blurrier compared to the default bilinear filtering. It will be good to confirm there's no regression in that case.

[devanshsaini11]

Could you move the filtering lines outside the #if block?

[zarv1k]

Hi @zarv1k Thanks for raising this PR, have you tested trilinear filter for magnification i.e small images in larger containers. Trilinear filtering can sometimes make upscaled images appear slightly blurrier compared to the default bilinear filtering. It will be good to confirm there's no regression in that case.

Hi! TBH I haven't seen any problems with blurry images for a while. I've been using such fixes for a long time via patching original fast-image lib to make images look better.
Just FYI: trilinear filtration on iOS is heavily used in core react-native image component as well.

[zarv1k]

Could you move the filtering lines outside the #if block?

done

[devanshsaini11]

@zarv1k
Trilinear filtering requires the generation of a full mipmap chain, which increases VRAM usage. For lists with many high-res images, making this the default could lead to Out-Of-Memory (OOM) crashes on older devices. For better flexibility we can expose this as a prop: trilinearFiltering?: boolean which defaults to false. To avoid prop-drilling, we should allow users to enable this globally. Example: FastImage.setGlobalConfig({ trilinearFiltering: true })