Skia does one thing really well, 2D graphics.
The original “Skia” was the development name for QuickDraw GX.
This Skia—which, again, doesn’t share code with either of its predecessors—is a kind of version 3, with a tribute name back to that original Skia. - HN / wikipedia
Skia vs Cairo vs Direct2D, which is the most feature rich? - It is far not that trivial to integrate Skia with existing 3D OpenGL code. Even Skia can work with OpenGL backend it changes state of OpenGL device and that creates problems.
Cairo emphasizes ease of use and high-quality, device-independent rendering with a stateful API, while Skia targets performance and flexibility, especially in GPU-accelerated environments, with a stateless, more granular control of each drawing operation. Depending on whether the focus is on performance or precision, one library might be a better fit than the other. - ChatGPT