Proposal: implement CanvasDrawPath.fillAndStroke()

[lehni]

I would like to suggest the addition of a method that performs both a fill and a stroke operation on the current path, or on the path passed to it, in a way that:

• the path is filled first, then stroked
• the properties of the CanvasCompositing interface (globalAlpha, globalCompositeOperation) as well as the CanvasShadowStyles interface (shadowOffsetX, shadowOffsetY, shadowBlur, shadowColor) are applied to the combined result of the operation, so that:
  • only the outside of the stroke has a shadow
  • the alpha value and other compositing options do not result in the stroke and the fill mixing, they only blend with what's underneath them.

The absence of such a possibility requires many hacks with double buffering, resulting in performance that's far from optimal. I believe that this simple addition would solve many situations that so far require such a hack.

void fillAndStroke(optional CanvasFillRule fillRule = "nonzero");
void fillAndStroke(Path2D path, optional CanvasFillRule fillRule = "nonzero");