NES PPU Viewer's "zoom box" shouldn't be anti-aliased

[YoshiRulz]

This guy:

BizHawk/src/BizHawk.Client.EmuHawk/tools/NES/NESPPU.Designer.cs

Line 726 in ebe3cad

private System.Windows.Forms.PictureBox ZoomBox;

PictureBox doesn't accept an InterpolationMode though. This SO answer suggests subclassing it and overriding OnPaint to mutate the Graphics before calling the base method. Don't forget to set PixelOffsetMode = Half too if you go ahead with this.

[Morilli]

Is there a bug currently? From what I see, the graphics in that box are not antialised, so what is the suggestion here?

[YoshiRulz]

Still present at f309dbc. This may be Mono-specific, I recall @TalicZealot had a similar bug in their ext. tool on Linux only.
(Bonus bug: Window is too narrow and it can't be resized.)

[Morilli]

This may be Mono-specific

Yep, looks that way. I found some old comments on InterpolationMode.NearestNeighbor being ignored, and it has something to do with Mono's libgdiplus using Cairo and that handles stuff differently... or something. In any case, this is most likely not related to anything BizHawk at all.