777x201 used to be the highest you could go with ddraw=0 without getting black borders and still have clean pixel perfect dots....and the extra pixels were because pinmame puts an extra "frame" or "border" around the dmd.
That has all changed now with DJRob's fixes he added to the latest PinMame.
Now the base value that we need to multiply is 257x65.... so I just multiplied that by 5 for 1285x325 for my 1366x768 resolution dmd monitor....and it works PERFECT! Now I just have ALL of my PinMAME games set to ddraw=0, not just vpx tables, and I make that my default so that new tables ran for the first time will work no matter what.... vp9, pm5, or vp10!
I have anti-alias set to 0 so that the dmd pixels are perfect and clean.
So now we have the newest VPX 10.2 which works in exclusive fullscreen with no "focus" issues anymore (no need for alt-tab fixes) and it runs silky smooth... and we can now have our DMDs set to any size we want with ddraw=0 with pixel perfect dmds thanks to DJRobX's fixes!
So for you, the resolution of the DMD in pinmame would be 1799x455 for your 1920x1080 resolution screen.