feat: allow overiding `sharp.options`

[farnabaz]

Use rotate operation to auto-rotate image based on EXIF orientation TAG.
Docs of rotate operation: https://github.com/lovell/sharp/blob/0ee08bfe46e0b204b34151fead8139027c768375/lib/operation.js#L41

fix https://github.com/nuxt/image/issues/70

[pi0]

• We may pass useExifOrientation option to sharp constructor -> here
• We might expose options.sharp from IPX to allow customizing this behavior
• There might be a reason this option is disabled by default

[farnabaz]

We may pass useExifOrientation option to sharp constructor

The sharp constructor does not support this option

There might be a reason this option is disabled by default

I didn't find any downside of enabling this. Event docs does not mention anything about downsides of this option. https://sharp.pixelplumbing.com/api-operation

[farnabaz]

@pi0 I've added an option to controll metadata removal on modified images

[pi0]

The sharp constructor does not support this option

What about sharp.options.useExifOrientation = true? 🤔

I didn't find any downside of enabling this. Event docs does not mention anything about downsides of this option.

Feature supported by https://github.com/lovell/sharp/pull/791 (@ncoden <3) At least seems adds additional CalculateExifRotationAndFlip call (that causes flip, rotate anyway)

There is no enough context about use-case (except one issue for specific project) also about behavior of cloud resizers (like cloudinary). I would suggest keeping it same as sharp defaults unless someone needs option of having better context that for sure we need it.

[farnabaz]

What about sharp.options.useExifOrientation = true? 🤔

This should work, and calling rotate with no option is the same. https://github.com/lovell/sharp/blob/master/lib/operation.js#L42
But the idea can be useful, we can support an IPX option to modify Sharp options

Object.assign(sharp.options, ipx.options)

[pi0]

This should work, and calling rotate with no option is the same. https://github.com/lovell/sharp/blob/master/lib/operation.js#L42

I see. Yet i would prefer using explicit option instead of implicitly calling rotate() for exif

[farnabaz]

@pi0 What do you think about changes?

This is really cool because users can control default behavior of sharp. What I love most is controling default quality for different formats

[farnabaz]

We may notice in documentation (both ipx and image module) that changing sharp options, needs a manual cache revalidation (or automate by generating cahce/integerity file with a checksum of options and invalidate directory if mistmatched)

I suggest to add docs and we can implement automation logic later