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Avalonia ImageLoader

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ClemensFischer 2024-05-22 16:15:29 +02:00
parent 3cc93c7460
commit 4867d52013
5 changed files with 69 additions and 36 deletions
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50
MapControl/Avalonia/ImageLoader.Avalonia.cs
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@ -4,6 +4,7 @@
using Avalonia.Media;
using Avalonia.Media.Imaging;
using Avalonia.Platform;
using System;
using System.IO;
using System.Threading.Tasks;
@ -29,22 +30,57 @@ namespace MapControl
public static Task<IImage> LoadImageAsync(string path)
{
if (!File.Exists(path))
{
return Task.FromResult<IImage>(null);
}
return Task.Run(() =>
{
if (!File.Exists(path))
{
return null;
}
using var stream = File.OpenRead(path);
return LoadImage(stream);
});
}
internal static Task<IImage> LoadMergedImageAsync(Uri uri1, Uri uri2, IProgress<double> progress)
internal static async Task<IImage> LoadMergedImageAsync(Uri uri1, Uri uri2, IProgress<double> progress)
{
return Task.FromResult<IImage>(null);
var images = await LoadImagesAsync(uri1, uri2, progress);
WriteableBitmap image = null;
if (images.Length == 2 &&
images[0] is Bitmap image1 &&
images[1] is Bitmap image2 &&
image1.PixelSize.Height == image2.PixelSize.Height &&
image1.Format.HasValue &&
image2.Format.HasValue &&
image1.Format.Value == image2.Format.Value &&
image1.AlphaFormat.HasValue &&
image2.AlphaFormat.HasValue &&
image1.AlphaFormat.Value == image2.AlphaFormat.Value)
{
var bpp = image1.Format.Value == PixelFormat.Rgb565 ? 2 : 4;
var size = new PixelSize(image1.PixelSize.Width + image2.PixelSize.Width, image1.PixelSize.Height);
var stride1 = image1.PixelSize.Width * bpp;
var stride = size.Width * bpp;
var buffer = new byte[stride * size.Height];
unsafe
{
fixed (byte* ptr = buffer)
{
var p = (nint)ptr;
image1.CopyPixels(new PixelRect(image1.PixelSize), p, buffer.Length, stride);
image2.CopyPixels(new PixelRect(image2.PixelSize), p + stride1, buffer.Length, stride);
image = new WriteableBitmap(image1.Format.Value, image1.AlphaFormat.Value, p, size, image1.Dpi, stride);
}
}
}
return image;
}
}
}

1
MapControl/Avalonia/MapControl.Avalonia.csproj
View file

@ -2,6 +2,7 @@
<PropertyGroup>
<TargetFramework>net8.0</TargetFramework>
<Nullable>disable</Nullable>
<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
<RootNamespace>MapControl</RootNamespace>
<AssemblyTitle>XAML Map Control Library for Avalonia UI</AssemblyTitle>
<Product>XAML Map Control</Product>