gpu: [compute] use support for simple strokes

In the old renderer, all strokes are converted to filled paths. The new
renderer can draw simple strokes natively. Do that, and avoid the costly
conversions.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

gpu/gpu.go

@@ -835,7 +835,7 @@ func (d *drawOps) collect(ctx driver.Device, cache *resourceCache, root *op.Ops,
 			data := buildPath(ctx, p.pathVerts)
 			var computePath encoder
 			if d.compute {
-				computePath = encodePath(p.pathVerts, p.stroke, p.dashes)
+				computePath = encodePath(p)
 			}
 			d.pathCache.put(p.pathKey, opCacheValue{
 				data:        data,