More Optimized Stroke Text

[alaninnovates]

In the example given in the meme.go demonstration for text with stroke width, the code inefficiently loops in an O(n^2) loop.

gg/examples/meme.go

Lines 15 to 26 in 8febc0f

	n := 6 // "stroke" size
	for dy := -n; dy <= n; dy++ {
	for dx := -n; dx <= n; dx++ {
	if dx*dx+dy*dy >= n*n {
	// give it rounded corners
	continue
	}
	x := S/2 + float64(dx)
	y := S/2 + float64(dy)
	dc.DrawStringAnchored(s, x, y, 0.5, 0.5)
	}
	}

In this case, when n=6, the maximum iterations that this could use is (6*2)^2 = 144 calls to DrawStringAnchored! This is wildly inefficient and requires a lot of CPU power.

I am wondering if there is an alternative and less intensive way to create a similar text stroke effect, or if such a function could be added. Thanks!