Added a resize sample

samples/SkiaSharpSample.Shared/Samples/BitmapScalerSample.cs

@@ -0,0 +1,89 @@
+using System;
+using System.Threading.Tasks;
+using SkiaSharp;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace SkiaSharpSample.Samples
+{
+	[Preserve(AllMembers = true)]
+	public class BitmapScalerSample : SampleBase
+	{
+		private List<SKBitmapResizeMethod> methods;
+		private SKBitmapResizeMethod method;
+		private SKBitmap bitmap;
+
+		[Preserve]
+		public BitmapScalerSample()
+		{
+		}
+
+		public override string Title => "Bitmap Scaling";
+
+		public override SampleCategories Category => SampleCategories.BitmapDecoding;
+
+		protected override Task OnInit()
+		{
+			methods = Enum.GetValues(typeof(SKBitmapResizeMethod)).Cast<SKBitmapResizeMethod>().ToList();
+			method = methods[0];
+
+			using (var stream = new SKManagedStream(SampleMedia.Images.AdobeDng))
+			{
+				bitmap = SKBitmap.Decode(stream);
+			}
+
+			return base.OnInit();
+		}
+
+		protected override void OnDestroy()
+		{
+			bitmap.Dispose();
+			bitmap = null;
+
+			base.OnDestroy();
+		}
+
+		protected override void OnDrawSample(SKCanvas canvas, int width, int height)
+		{
+			canvas.Clear(SKColors.White);
+
+			if (bitmap != null)
+			{
+				var bmpRect = SKRectI.Create(width, height).AspectFit(bitmap.Info.Size);
+
+				using (var resized = new SKBitmap(bmpRect.Width, bmpRect.Height))
+				using (var paint = new SKPaint())
+				{
+					bitmap.Resize(resized, method);
+
+					canvas.DrawBitmap(resized, bmpRect);
+
+					paint.TextAlign = SKTextAlign.Center;
+					paint.TextSize = 36;
+					paint.IsAntialias = true;
+
+					paint.Color = new SKColor(0, 0, 0, 127);
+					canvas.DrawRect(new SKRect(0, 0, width, (paint.TextSize * 2) + 30), paint);
+
+					paint.Color = SKColors.White;
+					canvas.DrawText(method.ToString(), width / 2, paint.TextSize + 10, paint);
+					canvas.DrawText("(tap to change)", width / 2, (paint.TextSize * 2) + 10, paint);
+				}
+			}
+		}
+
+		protected override void OnTapped()
+		{
+			var idx = methods.IndexOf(method) + 1;
+			if (idx >= methods.Count)
+			{
+				idx = 0;
+			}
+			method = methods[idx];
+
+			Refresh();
+
+			base.OnTapped();
+		}
+	}
+}

samples/SkiaSharpSample.Shared/SkiaSharpSample.Shared.projitems

@@ -17,6 +17,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)SampleBase.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)SampleMedia.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Samples\BitmapAnnotationSample.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Samples\BitmapScalerSample.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Samples\DecodeGifFramesSample.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Samples\BitmapSubsetDecoderSample.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Samples\ManipulatedBitmapShaderSample.cs" />