From 1021b0cb017d728006b26e43fd50085c2eb3deb8 Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Sat, 30 May 2020 16:52:49 -0300
Subject: [PATCH] correct opacity calculations.

---
 src/Skia/Avalonia.Skia/DrawingContextImpl.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Skia/Avalonia.Skia/DrawingContextImpl.cs b/src/Skia/Avalonia.Skia/DrawingContextImpl.cs
index 5003e40fc6..b43e20e390 100644
--- a/src/Skia/Avalonia.Skia/DrawingContextImpl.cs
+++ b/src/Skia/Avalonia.Skia/DrawingContextImpl.cs
@@ -711,10 +711,10 @@ namespace Avalonia.Skia
                     acrylicBrush.BackgroundSource == AcrylicBackgroundSource.Digger ? 
                     acrylicBrush.TintOpacity : 1;
 
-                var noiseOpcity = 0.9;
+                var noiseOpcity = 0.09 * brush.Opacity;
 
                 var excl = new SKColor(255, 255, 255, (byte)(255 * acrylicBrush.TintLuminosityOpacity));
-                var tint = new SKColor(acrylicBrush.TintColor.R, acrylicBrush.TintColor.G, acrylicBrush.TintColor.B, (byte)(255 * (tintOpacity * acrylicBrush.Opacity * acrylicBrush.TintColor.A)));
+                var tint = new SKColor(acrylicBrush.TintColor.R, acrylicBrush.TintColor.G, acrylicBrush.TintColor.B, (byte)(255 * (tintOpacity * acrylicBrush.Opacity * (acrylicBrush.TintColor.A / 255.0))));
 
                 tint = SimpleColorBurn(excl, tint);