diff --git a/ui/app/os_wayland.go b/ui/app/os_wayland.go
index 1eaa5a97..f4f6e83f 100644
--- a/ui/app/os_wayland.go
+++ b/ui/app/os_wayland.go
@@ -237,8 +237,8 @@ func createNativeWindow(opts *WindowOptions) (*window, error) {
 	C.free(unsafe.Pointer(title))
 
 	_, _, cfg := w.config()
-	w.width = int(cfg.Val(opts.Width) + .5)
-	w.height = int(cfg.Val(opts.Height) + .5)
+	w.width = cfg.Val(opts.Width)
+	w.height = cfg.Val(opts.Height)
 	if conn.decor != nil {
 		// Request server side decorations.
 		w.decor = C.zxdg_decoration_manager_v1_get_toplevel_decoration(conn.decor, w.topLvl)
diff --git a/ui/gesture/gestures.go b/ui/gesture/gestures.go
index 7ea1f3de..26e657be 100644
--- a/ui/gesture/gestures.go
+++ b/ui/gesture/gestures.go
@@ -165,9 +165,9 @@ func (s *Scroll) Scroll(cfg *ui.Config, q input.Events, axis Axis) int {
 				break
 			}
 			fling := s.estimator.Estimate()
-			if slop, d := cfg.Val(touchSlop), fling.Distance; d >= slop || -slop >= d {
-				if min, v := cfg.Val(minFlingVelocity), fling.Velocity; v >= min || -min >= v {
-					max := cfg.Val(maxFlingVelocity)
+			if slop, d := float32(cfg.Val(touchSlop)), fling.Distance; d >= slop || -slop >= d {
+				if min, v := float32(cfg.Val(minFlingVelocity)), fling.Velocity; v >= min || -min >= v {
+					max := float32(cfg.Val(maxFlingVelocity))
 					if v > max {
 						v = max
 					} else if v < -max {
@@ -201,7 +201,7 @@ func (s *Scroll) Scroll(cfg *ui.Config, q input.Events, axis Axis) int {
 			dist := s.last - v
 			if e.Priority < pointer.Grabbed {
 				slop := cfg.Val(touchSlop)
-				if dist := float32(dist); dist >= slop || -slop >= dist {
+				if dist := dist; dist >= slop || -slop >= dist {
 					s.grab = true
 				}
 			} else {
diff --git a/ui/measure/measure.go b/ui/measure/measure.go
index 33346c37..b1c87223 100644
--- a/ui/measure/measure.go
+++ b/ui/measure/measure.go
@@ -102,7 +102,7 @@ func (f *Faces) init() {
 }
 
 func (f *textFace) Layout(str string, opts text.LayoutOptions) *text.Layout {
-	ppem := fixed.Int26_6(f.faces.Config.Val(f.size)*64 + .5)
+	ppem := fixed.Int26_6(f.faces.Config.Val(f.size) * 64)
 	lk := layoutKey{
 		f:    f.font.Font,
 		ppem: ppem,
@@ -120,7 +120,7 @@ func (f *textFace) Layout(str string, opts text.LayoutOptions) *text.Layout {
 }
 
 func (f *textFace) Path(str text.String) ui.BlockOp {
-	ppem := fixed.Int26_6(f.faces.Config.Val(f.size)*64 + .5)
+	ppem := fixed.Int26_6(f.faces.Config.Val(f.size) * 64)
 	pk := pathKey{
 		f:    f.font.Font,
 		ppem: ppem,
diff --git a/ui/text/editor.go b/ui/text/editor.go
index 206b6fbe..2dea373a 100644
--- a/ui/text/editor.go
+++ b/ui/text/editor.go
@@ -153,7 +153,7 @@ func (e *Editor) Next() (EditorEvent, bool) {
 }
 
 func (e *Editor) caretWidth() fixed.Int26_6 {
-	oneDp := int(e.Config.Val(ui.Dp(1)) + .5)
+	oneDp := e.Config.Val(ui.Dp(1))
 	return fixed.Int26_6(oneDp * 64)
 }
 
@@ -167,7 +167,7 @@ func (e *Editor) Layout(ops *ui.Ops, cs layout.Constraints) layout.Dimens {
 			break
 		}
 	}
-	twoDp := int(e.Config.Val(ui.Dp(2)) + 0.5)
+	twoDp := e.Config.Val(ui.Dp(2))
 	e.padLeft, e.padRight = twoDp, twoDp
 	maxWidth := cs.Width.Max
 	if e.SingleLine {
diff --git a/ui/ui.go b/ui/ui.go
index aaa03ea4..f8fd5c77 100644
--- a/ui/ui.go
+++ b/ui/ui.go
@@ -23,27 +23,29 @@ type Config struct {
 }
 
 // Dp converts a value in dp units to pixels.
-func (c *Config) Dp(dp float32) float32 {
-	return c.PxPerDp * dp
+func (c *Config) Dp(dp float32) int {
+	return c.Val(Dp(dp))
 }
 
 // Sp converts a value in sp units to pixels.
-func (c *Config) Sp(sp float32) float32 {
-	return c.PxPerSp * sp
+func (c *Config) Sp(sp float32) int {
+	return c.Val(Sp(sp))
 }
 
 // Val converts a value to pixels.
-func (c *Config) Val(v Value) float32 {
+func (c *Config) Val(v Value) int {
+	var r float32
 	switch v.U {
 	case UnitPx:
-		return v.V
+		r = v.V
 	case UnitDp:
-		return c.PxPerDp * v.V
+		r = c.PxPerDp * v.V
 	case UnitSp:
-		return c.PxPerSp * v.V
+		r = c.PxPerSp * v.V
 	default:
 		panic("unknown unit")
 	}
+	return int(math.Round(float64(r)))
 }
 
 // LayerOp represents a semantic layer of UI.
diff --git a/ui/widget/image.go b/ui/widget/image.go
index ffffed84..dc706b56 100644
--- a/ui/widget/image.go
+++ b/ui/widget/image.go
@@ -25,12 +25,14 @@ type Image struct {
 
 func (im Image) Layout(c *ui.Config, ops *ui.Ops, cs layout.Constraints) layout.Dimens {
 	size := im.Src.Bounds()
-	scale := im.Scale
-	if scale == 0 {
+	wf, hf := float32(size.Dx()), float32(size.Dy())
+	var w, h int
+	if im.Scale == 0 {
 		const dpPrPx = 160 / 72
-		scale = c.Val(ui.Dp(dpPrPx))
+		w, h = c.Dp(wf*dpPrPx), c.Dp(hf*dpPrPx)
+	} else {
+		w, h = int(wf*im.Scale+.5), int(hf*im.Scale+.5)
 	}
-	w, h := int(float32(size.Dx())*scale+.5), int(float32(size.Dy())*scale+.5)
 	d := image.Point{X: cs.Width.Constrain(w), Y: cs.Height.Constrain(h)}
 	aspect := float32(w) / float32(h)
 	dw, dh := float32(d.X), float32(d.Y)