Replaced orange with a dim/grey color

backends/x/draw.go

@@ -118,9 +118,17 @@ func (backend *Backend) drawRune (
 			backend.boundsOfCell(x, y))
 	}
 
-	backend.sprayRuneMask (
-		mask, destinationRectangle,
-		maskPoint, backend.colors[runeColor])
+	// cue a series of pointless optimizations
+	alphaMask, isAlpha := mask.(*image.Alpha)
+	if isAlpha {
+		backend.sprayRuneMaskAlpha (
+			alphaMask, destinationRectangle,
+			maskPoint, backend.colors[runeColor])
+	} else {
+		backend.sprayRuneMask (
+			mask, destinationRectangle,
+			maskPoint, backend.colors[runeColor])
+	}
 }
 
 func (backend *Backend) sprayRuneMask (
@@ -150,6 +158,32 @@ func (backend *Backend) sprayRuneMask (
 	}}
 }
 
+func (backend *Backend) sprayRuneMaskAlpha (
+	mask      *image.Alpha,
+	bounds    image.Rectangle,
+	maskPoint image.Point,
+	fill      xgraphics.BGRA,
+) {
+	maxX := bounds.Max.X - bounds.Min.X
+	maxY := bounds.Max.Y - bounds.Min.Y
+	
+	for y := 0; y < maxY; y ++ {
+	for x := 0; x < maxX; x ++ {
+		alpha := mask.AlphaAt(x + maskPoint.X, y + maskPoint.Y).A
+		backend.canvas.SetBGRA (
+			x + bounds.Min.X,
+			y + bounds.Min.Y - backend.metrics.descent,
+			xgraphics.BlendBGRA (
+				backend.colors[stone.ColorBackground],
+				xgraphics.BGRA {
+					R: fill.R,
+					G: fill.G,
+					B: fill.B,
+					A: alpha,
+				}))
+	}}
+}
+
 func fillRectangle (
 	source      image.Image,
 	destination draw.Image,