You waited 18 hours on a major holiday when many of the devs have family obligations. And the documentation explains everything you're asking. Hint: look at the HLSL or BGFX sections. Both of them can do scanlines plus rounded corners.
Also, you gave no useful information. Did you try -hlsl as suggested by Just Desserts? Are you even on Windows? What version of MAME are you using?
Yes I said that I was under Windows 7 with MAME version 0.216... I am a beginner I do not understand much sorry... I do not want the command lines thank you