When you have a coordinate in SDL, for example to pass to SDL_RenderLine or as rect origin for SDL_RenderRect, does this coordinate refer to the center of a pixel (assuming no integer DPI scaling) or to the zero-width grid around the pixels, i.e. the top left corner of the pixel?
This image from a blog post I found illustrates what I mean: https://ppwwyyxx.com/blog/2021/Where-are-Pixels/origin.png
I can’t find the answer to this anywhere in the SDL3 documentation. Did I miss it or is this not documented?