Updated Next.js support for `picture` and more

[leerob]

Hey! Heads up. We have extracted the core logic from next/image into a new unstable_getImgProps() function.

This allows usage outside of <Image>, such as:

1. Working with background-image or image-set
2. Working with canvas context.drawImage() or simply new Image()
3. Working with <picture> media queries to implement Art Direction or Light/Dark Mode images

Example

import { unstable_getImgProps as getImgProps } from 'next/image'

export default function Page() {
  const common = { alt: 'Hero', width: 800, height: 400 }
  const { props: { srcSet: dark } } = getImgProps({ ...common, src: '/dark.png' })
  const { props: { srcSet: light, ...rest } } = getImgProps({ ...common, src: '/light.png' })

  return (<picture>
  <source media="(prefers-color-scheme: dark)" srcSet={dark} />
  <source media="(prefers-color-scheme: light)" srcSet={light} />
  <img {...rest} />
</picture>)
}

PR: vercel/next.js#51205