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@@ -0,0 +1,119 @@
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+using System;
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+using System.Diagnostics;
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+using Avalonia;
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+using Avalonia.Controls;
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+using Avalonia.Media;
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+using Avalonia.Platform;
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+using Avalonia.Rendering.SceneGraph;
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+using Avalonia.Skia;
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+using Avalonia.Threading;
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+using SkiaSharp;
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+
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+namespace RenderDemo.Pages
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+{
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+ public class CustomSkiaPage : Control
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+ {
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+ public CustomSkiaPage()
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+ {
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+ ClipToBounds = true;
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+ }
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+
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+ class CustomDrawOp : ICustomDrawOperation
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+ {
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+ private readonly FormattedText _noSkia;
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+
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+ public CustomDrawOp(Rect bounds, FormattedText noSkia)
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+ {
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+ _noSkia = noSkia;
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+ Bounds = bounds;
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+ }
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+
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+ public void Dispose()
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+ {
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+ // No-op
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+ }
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+
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+ public Rect Bounds { get; }
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+ public bool HitTest(Point p) => false;
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+ public bool Equals(ICustomDrawOperation other) => false;
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+ static Stopwatch St = Stopwatch.StartNew();
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+ public void Render(IDrawingContextImpl context)
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+ {
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+ var canvas = (context as ISkiaDrawingContextImpl)?.SkCanvas;
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+ if (canvas == null)
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+ context.DrawText(Brushes.Black, new Point(), _noSkia.PlatformImpl);
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+ else
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+ {
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+ canvas.Save();
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+ // create the first shader
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+ var colors = new SKColor[] {
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+ new SKColor(0, 255, 255),
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+ new SKColor(255, 0, 255),
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+ new SKColor(255, 255, 0),
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+ new SKColor(0, 255, 255)
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+ };
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+
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+ var sx = Animate(100, 2, 10);
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+ var sy = Animate(1000, 5, 15);
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+ var lightPosition = new SKPoint(
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+ (float)(Bounds.Width / 2 + Math.Cos(St.Elapsed.TotalSeconds) * Bounds.Width / 4),
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+ (float)(Bounds.Height / 2 + Math.Sin(St.Elapsed.TotalSeconds) * Bounds.Height / 4));
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+ using (var sweep =
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+ SKShader.CreateSweepGradient(new SKPoint((int)Bounds.Width / 2, (int)Bounds.Height / 2), colors,
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+ null))
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+ using(var turbulence = SKShader.CreatePerlinNoiseFractalNoise(0.05f, 0.05f, 4, 0))
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+ using(var shader = SKShader.CreateCompose(sweep, turbulence, SKBlendMode.SrcATop))
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+ using(var blur = SKImageFilter.CreateBlur(Animate(100, 2, 10), Animate(100, 5, 15)))
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+ using (var paint = new SKPaint
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+ {
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+ Shader = shader,
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+ ImageFilter = blur
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+ })
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+ canvas.DrawPaint(paint);
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+
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+ using (var pseudoLight = SKShader.CreateRadialGradient(
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+ lightPosition,
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+ (float) (Bounds.Width/3),
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+ new [] {
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+ new SKColor(255, 200, 200, 100),
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+ SKColors.Transparent,
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+ new SKColor(40,40,40, 220),
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+ new SKColor(20,20,20, (byte)Animate(100, 200,220)) },
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+ new float[] { 0.3f, 0.3f, 0.8f, 1 },
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+ SKShaderTileMode.Clamp))
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+ using (var paint = new SKPaint
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+ {
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+ Shader = pseudoLight
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+ })
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+ canvas.DrawPaint(paint);
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+ canvas.Restore();
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+ }
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+ }
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+ static int Animate(int d, int from, int to)
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+ {
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+ var ms = (int)(St.ElapsedMilliseconds / d);
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+ var diff = to - from;
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+ var range = diff * 2;
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+ var v = ms % range;
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+ if (v > diff)
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+ v = range - v;
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+ var rv = v + from;
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+ if (rv < from || rv > to)
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+ throw new Exception("WTF");
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+ return rv;
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+ }
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+ }
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+
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+
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+
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+ public override void Render(DrawingContext context)
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+ {
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+ var noSkia = new FormattedText()
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+ {
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+ Text = "Current rendering API is not Skia"
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+ };
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+ context.Custom(new CustomDrawOp(new Rect(0, 0, Bounds.Width, Bounds.Height), noSkia));
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+ Dispatcher.UIThread.InvokeAsync(InvalidateVisual, DispatcherPriority.Background);
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+ }
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+ }
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+}
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