Nikita Tsukanov
7 years ago
committed by
GitHub
GitHub
38 changed files with 277 additions and 25 deletions
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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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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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class CustomDrawOp : ICustomDrawOperation |
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{ |
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private readonly FormattedText _noSkia; |
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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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public void Dispose() |
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{ |
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// No-op
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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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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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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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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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@ -0,0 +1,8 @@ |
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// Copyright (c) The Avalonia Project. All rights reserved.
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// Licensed under the MIT license. See licence.md file in the project root for full license information.
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using System.Reflection; |
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using System.Runtime.CompilerServices; |
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using Avalonia.Metadata; |
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[assembly: XmlnsDefinition("http://reactiveui.net", "Avalonia.ReactiveUI")] |
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@ -0,0 +1,39 @@ |
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using System; |
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using Avalonia.Media; |
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using Avalonia.Platform; |
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namespace Avalonia.Rendering.SceneGraph |
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{ |
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internal sealed class CustomDrawOperation : DrawOperation |
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{ |
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public Matrix Transform { get; } |
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public ICustomDrawOperation Custom { get; } |
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public CustomDrawOperation(ICustomDrawOperation custom, Matrix transform) |
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: base(custom.Bounds, transform, null) |
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{ |
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Transform = transform; |
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Custom = custom; |
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} |
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public override bool HitTest(Point p) |
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{ |
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return Custom.HitTest(p * Transform); |
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} |
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public override void Render(IDrawingContextImpl context) |
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{ |
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context.Transform = Transform; |
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Custom.Render(context); |
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} |
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public override void Dispose() => Custom.Dispose(); |
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public bool Equals(Matrix transform, ICustomDrawOperation custom) => |
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Transform == transform && Custom?.Equals(custom) == true; |
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} |
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public interface ICustomDrawOperation : IDrawOperation, IEquatable<ICustomDrawOperation> |
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{ |
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} |
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} |
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@ -0,0 +1,10 @@ |
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using Avalonia.Platform; |
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using SkiaSharp; |
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namespace Avalonia.Skia |
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{ |
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public interface ISkiaDrawingContextImpl : IDrawingContextImpl |
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{ |
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SKCanvas SkCanvas { get; } |
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} |
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} |
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