GraphicsDrawable.cs

namespace Maui.Controls.Sample;

public class GraphicsDrawable(Microsoft.Maui.Graphics.IImage[] images) : IDrawable
{
	public void Draw(ICanvas canvas, RectF dirtyRect)
	{
		// 3x3 matrix composed of 100x100 images. The number of images is always 9. 
		for (int i = 0; i < images.Length; i++)
		{
			int row = i / 3;
			int column = i % 3;

			canvas.DrawImage(images[i], column * 100, row * 100, 100, 100);
		}		
	}
}

MainPage.xaml

<ContentPage
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    x:Class="Maui.Controls.Sample.MainPage"
    xmlns:local="clr-namespace:Maui.Controls.Sample">
  <VerticalStackLayout>
    <Button Text="Test" Clicked="OnCounterClicked"/>
    <GraphicsView x:Name="graphicsVIew" WidthRequest="500" HeightRequest="500" />
  </VerticalStackLayout>
</ContentPage>

MainPage.xaml.cs

using System.IO;
using Microsoft.Maui.Graphics.Platform;

namespace Maui.Controls.Sample;

public partial class MainPage : ContentPage
{
	public MainPage()
	{
		InitializeComponent();
	}

	private async void OnCounterClicked(object sender, EventArgs e)
	{
		try
		{
			using HttpClient httpClient = new();

			int count = 9;
			Stream[] streams = new Stream[count];
			Task<Microsoft.Maui.Graphics.IImage>[] imageTasks = new Task<Microsoft.Maui.Graphics.IImage>[count];

			// Download sample images.
			for (int i = 0; i < count; i++)
			{
				streams[i] = await httpClient.GetStreamAsync("https://picsum.photos/100");
			}

			// Attempt to load them in parallel to make it more likely to hit any possible error.
			for (int i = 0; i < count; i++)
			{
				Stream stream = streams[i];
				imageTasks[i] = Task.Run(() => PlatformImage.FromStream(stream));
			}

			Microsoft.Maui.Graphics.IImage[] images = imageTasks.Select(task => task.Result).ToArray();

			graphicsVIew.Drawable = new GraphicsDrawable(images);
		}
		catch (Exception ex)
		{
			Console.WriteLine(ex);
		}
	}
}