95 lines
3.0 KiB
C#
95 lines
3.0 KiB
C#
using System;
|
|
using Avalonia;
|
|
using Avalonia.Controls;
|
|
using Avalonia.Media;
|
|
using Avalonia.Platform;
|
|
using Avalonia.Rendering.SceneGraph;
|
|
using Avalonia.Skia;
|
|
using SkiaSharp;
|
|
|
|
namespace Nitrox.Launcher.Models.Controls;
|
|
|
|
/// <summary>
|
|
/// Draws a blur filter over the already rendered content.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// Based off of GrayscaleControl
|
|
/// </remarks>
|
|
public sealed class BlurControl : Decorator
|
|
{
|
|
public static readonly StyledProperty<float> BlurStrengthProperty =
|
|
AvaloniaProperty.Register<BlurControl, float>(nameof(BlurStrength), 5);
|
|
|
|
/// <summary>
|
|
/// Sets or gets how strong the blur should be. Defaults to 5.
|
|
/// </summary>
|
|
public float BlurStrength
|
|
{
|
|
get => GetValue(BlurStrengthProperty);
|
|
set => SetValue(BlurStrengthProperty, value);
|
|
}
|
|
|
|
static BlurControl()
|
|
{
|
|
ClipToBoundsProperty.OverrideDefaultValue<BlurControl>(true);
|
|
AffectsRender<BlurControl>(OpacityProperty);
|
|
AffectsRender<BlurControl>(BlurStrengthProperty);
|
|
}
|
|
|
|
public override void Render(DrawingContext context)
|
|
{
|
|
context.Custom(new BlurBehindRenderOperation((byte)Math.Round(byte.MaxValue * Opacity), BlurStrength, new Rect(default, Bounds.Size)));
|
|
}
|
|
|
|
private sealed record BlurBehindRenderOperation : ICustomDrawOperation
|
|
{
|
|
private readonly Rect bounds;
|
|
private readonly byte opacity;
|
|
private readonly float strength;
|
|
|
|
public Rect Bounds => bounds;
|
|
|
|
public BlurBehindRenderOperation(byte opacity, float strength, Rect bounds)
|
|
{
|
|
this.opacity = opacity;
|
|
this.strength = strength;
|
|
this.bounds = bounds;
|
|
}
|
|
|
|
public void Dispose()
|
|
{
|
|
}
|
|
|
|
public bool HitTest(Point p) => bounds.Contains(p);
|
|
|
|
public void Render(ImmediateDrawingContext context)
|
|
{
|
|
ISkiaSharpApiLeaseFeature leaseFeature = context.TryGetFeature<ISkiaSharpApiLeaseFeature>();
|
|
if (leaseFeature == null)
|
|
{
|
|
return;
|
|
}
|
|
using ISkiaSharpApiLease skia = leaseFeature.Lease();
|
|
if (!skia.SkCanvas.TotalMatrix.TryInvert(out SKMatrix currentInvertedTransform))
|
|
{
|
|
return;
|
|
}
|
|
if (skia.SkSurface == null)
|
|
{
|
|
return;
|
|
}
|
|
|
|
using SKImage backgroundSnapshot = skia.SkSurface.Snapshot();
|
|
using SKShader backdropShader = SKShader.CreateImage(backgroundSnapshot, SKShaderTileMode.Clamp, SKShaderTileMode.Clamp, currentInvertedTransform);
|
|
using SKImageFilter blurFilter = SKImageFilter.CreateBlur(strength, strength);
|
|
using SKPaint paint = new();
|
|
paint.Shader = backdropShader;
|
|
paint.ImageFilter = blurFilter;
|
|
paint.Color = new SKColor(0, 0, 0, opacity);
|
|
skia.SkCanvas.DrawRect(0, 0, (float)bounds.Width, (float)bounds.Height, paint);
|
|
}
|
|
|
|
public bool Equals(ICustomDrawOperation other) => Equals(other as BlurBehindRenderOperation);
|
|
}
|
|
}
|