White and Black point in FCPX

In premiere and lr, in their adjustments panel, they have a slider for white and Black point. (As well as all the fcpx color controls)

What is the equivalent white and Black point slider in fcpx?

I can't tell you what happens mathematically with the values with said LR/PR sliders, but it they effectively adjust the brightness of a certain luma range only. You can do that in FCP with > Color Curves >Luma and either limit the range arbitrarily or setting one (of at least three) fixed point (it doesn't have to be the center!) with the eyedropper.

Now I don't have Premiere, only Lightroom, but if they are the same, then there is more to them than just changing a specific range of values: they are a more complex tool in that (by holding down alt) they show affected/clipped values above a black mask. In FCP, you'd need to watch the histogram instead. On the other hand, the selection itself is more precise.

If you followed the controversy about how the highlights/midtones/shadows *had* worked in FCP 10.4.0 (highlight behavior has changed since then), you know that all tools are different in all applications. Knowing color swatches in Resolve/Apple Color/Lumetri doesn't teach you how to use them in FCP X. I had called this a bug, but I have successfully used the FCP tools since then, and I assume they behave differently for a reason. Though, to be honest, I'd wish some experienced colorist would explain the background in detail.

If i.e, you raise the shadows, midtones and highlights are affected considerably (much more than elsewhere). On the other hand, it seems that shadows are not as easily crushed as in other CC suites. The black point slider in Lightroom is very aggressive. This could be appropriate for a CMYK image, but not so good for video.

Again, I'm no expert here, and I don't know what actually happens under the hood. Alexis van Hurkman once (don't know if it was in the manual) documented the maths and reasoning behind Resolves lift, gamma and gain. All we know for sure is that FCP X has a completely different approach.