Merge pull request #19427 from ramezgerges/textblock_foreground_fallbackcolor

Author: MartinZikmund

src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Media/GradientBrushTests/GradientsPage.xaml

@@ -328,7 +328,7 @@
 					</Rectangle.Stroke>
 				</Rectangle>
 			</StackPanel>
-			<TextBlock FontSize="15">Text with Radial/Linear gradient as foreground brush (fallback=green)</TextBlock>
+			<TextBlock FontSize="15">Text with Radial/Linear gradient as foreground brush (fallback=red)</TextBlock>
 			<StackPanel Orientation="Horizontal" Spacing="10">
 				<TextBlock Text="UNO" FontSize="110" FontWeight="Bold">
 					<TextBlock.Foreground>

src/Uno.UI/UI/Xaml/Documents/InlineCollection.skia.cs

@@ -514,6 +514,24 @@ internal void Draw(in Visual.PaintingSession session)
 							blue: scbColor.B,
 							alpha: (byte)(scbColor.A * scb.Opacity * session.Filters.Opacity));
 					}
+					else if (inline.Foreground is GradientBrush gb)
+					{
+						var gbColor = gb.FallbackColorWithOpacity;
+						paint.Color = new SKColor(
+							red: gbColor.R,
+							green: gbColor.G,
+							blue: gbColor.B,
+							alpha: (byte)(gbColor.A * session.Filters.Opacity));
+					}
+					else if (inline.Foreground is XamlCompositionBrushBase xcbb)
+					{
+						var gbColor = xcbb.FallbackColorWithOpacity;
+						paint.Color = new SKColor(
+							red: gbColor.R,
+							green: gbColor.G,
+							blue: gbColor.B,
+							alpha: (byte)(gbColor.A * session.Filters.Opacity));
+					}
 
 					// TODO: Consider using a stackalloc for small values of GlyphsLength.
 					// Note that using a stackalloc will require refactoring this code to a separate method to avoid having a stackalloc in a loop.