Use PixelCopy to create Screenshots

[kahest]

Description

Using PixelCopy to create screenshots is likely to provide better performance than the current approach.
See https://developer.android.com/reference/android/view/PixelCopy

[markushi]

So I've compared the old API against the new one and it's slower.

Turns out the async API is a lie, only the callback gets executed async - but capturing is happening on the calling thread.
See the source for more details.

Surprisingly PixelCopy is also around 20% slower, maybe because it e.g. also draws shadows?
Pixel 6a, Demo App, Release build

n=20, PixelCopy.request avg 145.6ms, ScreenshotUtils.takeScreenshot avg 116.85ms

[markushi]

Closing this as it doesn't seem to give us any real advantage over ScreenshotUtils.takeScreenshot. Let's see if we can call this API on a background thread, which would be the only advantage then.