Isn't that because those corners are rendered as Bezier curves that are H/W accelerated? Usually, small radii are emulated by beziers: https://spencermortense

Isn't that because those corners are rendered as Bezier curves that are H/W accelerated? Usually, small radii are emulated by beziers: https://spencermortensen.com/articles/bezier-circle/ https://spencermortensen.com/articles/bezier-circle/