remove traces & minor cleanups

src/splines/Math/Algebra/Dual/Internal.hs

@@ -87,6 +87,7 @@ data D3𝔸1 v =
       , _D31_dxdxdx :: !( T v )
       }
   deriving stock ( Show, Eq, Functor, Foldable, Traversable, Generic, Generic1 )
+  deriving anyclass NFData
   deriving Applicative
     via Generically1 D3𝔸1
 
@@ -107,6 +108,7 @@ data D2𝔸2 v =
       , _D22_dxdx, _D22_dxdy, _D22_dydy :: !( T v )
       }
   deriving stock ( Show, Eq, Functor, Foldable, Traversable, Generic, Generic1 )
+  deriving anyclass NFData
   deriving Applicative
     via Generically1 D2𝔸2
 

src/splines/Math/Bezier/Cubic/Fit.hs

@@ -82,8 +82,6 @@ import Math.Roots
 import Math.Linear
   ( Mat22(..), ℝ(..), T(..) )
 
-import Debug.Utils
-
 --------------------------------------------------------------------------------
 
 -- | Parameters to the curve fitting algorithm.
@@ -147,8 +145,8 @@ fitSpline ( FitParameters {..} ) curveFn = go 0
           ( bez, Max ( Arg max_sq_error t_split_0 ) )
             |  subdiv >= maxSubdiv
             || max_sq_error <= dist_tol ^ ( 2 :: Int )
-            -> trace ( unlines [ "fitSpline: piece is OK", "t_min = " ++ show t_min, "start = " ++ show p, "start tgt = " ++ show tp, "t_max = " ++ show t_max, "end = " ++ show r, "end tgt = " ++ show tr ] )
+            -> -- trace ( unlines [ "fitSpline: piece is OK", "t_min = " ++ show t_min, "start = " ++ show p, "start tgt = " ++ show tp, "t_max = " ++ show t_max, "end = " ++ show r, "end tgt = " ++ show tr ] ) $
-             $ ( openCubicBezierCurveSpline () bez, ( FitTangent p tp :<| Seq.fromList ( map FitPoint qs ) ) :|> FitTangent r tr )
+               ( openCubicBezierCurveSpline () bez, ( FitTangent p tp :<| Seq.fromList ( map FitPoint qs ) ) :|> FitTangent r tr )
             | let
                 t_split :: ℝ 1
                 t_split = ℝ1 $ min ( 1 - dt ) $ max dt t_split_0

src/splines/Math/Bezier/Stroke.hs

@@ -403,9 +403,7 @@ computeStrokeOutline fitParams ptParams toBrushParams brushFn spline@( Spline {
       mbOutline <- lift ( readSTRef cachedStrokeRef )
       case mbOutline of
         -- Cached fit data is available: use it.
-        Just outline -> do
+        Just outline -> tell outline
-          tell outline
-          pure ()
         -- No cached fit: compute the fit anew.
         Nothing -> do
           let