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To use alpha transparency you need to set Transparent=False. Here's what it looks like (Delphi 10.3):

I solve most of my problems in the shower. Eureka!

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SaveDC/RestoreDC in such cases are usually used to restore original clipping region, since you change it in the code.

The issue happens due to the fact that you use two not fully compatible ways to deal with the device context (DC): 1) Delphi TCanvas wrapper, which have a lot of lazy initializing stuff. For example, when you change the color of the Brush, the brush object is marked as invalid internally, and its handle will be recreated later - only when needed. 2) WinAPI directly, like SaveDC/RestoreDC, which skips mentioned Delphi internal invalidation. TCanvas.Refresh method is specifically exist to resort cases like this. Try to call it just before ACanvas.Polygon. I can even describe, why red color is a kind of special color, which do not work (as opposed to any other color, like black). And I agree - ColorToRGB is not needed here.

TMS WebCore has electron wrappers that work with their web components. I don't really like FMX, and prefer Raize / Konopka components for routine VCL work. But WebCore has their own plus you can use the TMS FNC components as well. They both have lots of properties added to support the unique needs of running inside a browser DOM, including support for CSS.

Rubber Duck Debugging: https://en.wikipedia.org/wiki/Rubber_duck_debugging

Thank you, we used Blender for render sprite animations and some character animations from mixamo