What does Res Scale actually do?

[Toby K]

I've read the Res Scale documentation in the API docs

eg

https://api.skia.org/classSkPaint.html#a9a252159ba57877a58b718b3ce016473

And I cant find anything when I search Res Scale on skia.org

I'm looking for a deeper understanding. 

What does Res Scale mean?

How does it work? 

One time I had an issue with conic curves and GetFillPath that fixed when Res Scale was above 2.25. But it was a sudden jump, didn't seem to operate like a linear scale modifier.

[Brian Osman]

It does control the level of subdivision for curves, but those changes may not be linear. (Essentially, things like stroking and path linearization try to hit a goal of being within one-pixel everywhere. Increasing the resScale will make that be true, if the path is drawn/linearized at that particular scale factor.) Internally, it's generally just determined by the larger scale factor (X or Y) from the matrix when doing a drawing operation.

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[Toby K]

Ok! Thankyou for the quick response

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