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feature: .dds image support (#1392)

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* Added Pfim as 3rdparty lib

* Added support for parsing showing dds and tga images using Pfim

---------

Co-authored-by: Snimax <snimax@live.se>
This commit is contained in:
Henrik Andersson 2025-06-06 10:44:40 +02:00 • committed by GitHub
parent 7bba40d03f
commit a2ca071f08
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3 changed files with 91 additions and 0 deletions
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1
src/Models/ImageDecoder.cs
View file

@ -4,5 +4,6 @@
{
None = 0,
Builtin,
Pfim
}
}

1
src/SourceGit.csproj
View file

@ -50,6 +50,7 @@
<PackageReference Include="CommunityToolkit.Mvvm" Version="8.4.0" />
<PackageReference Include="LiveChartsCore.SkiaSharpView.Avalonia" Version="2.0.0-rc5.4" />
<PackageReference Include="OpenAI" Version="2.2.0-beta.4" />
<PackageReference Include="Pfim" Version="0.11.3" />
<PackageReference Include="TextMateSharp" Version="1.0.66" />
<PackageReference Include="TextMateSharp.Grammars" Version="1.0.66" />
</ItemGroup>

89
src/ViewModels/ImageSource.cs
View file

@ -1,5 +1,7 @@
using System.IO;
using System.Runtime.InteropServices;
using Avalonia.Media.Imaging;
using Pfim;
namespace SourceGit.ViewModels
{
@ -27,6 +29,9 @@ namespace SourceGit.ViewModels
case ".png":
case ".webp":
return Models.ImageDecoder.Builtin;
case ".tga":
case ".dds":
return Models.ImageDecoder.Pfim;
default:
return Models.ImageDecoder.None;
}
@ -70,9 +75,93 @@ namespace SourceGit.ViewModels
// Just ignore.
}
}
else if (decoder == Models.ImageDecoder.Pfim)
{
return new ImageSource(LoadWithPfim(stream), size);
}
}
return new ImageSource(null, 0);
}
private static Bitmap LoadWithPfim(Stream stream)
{
var image = Pfim.Pfimage.FromStream(stream);
byte[] data;
int stride;
if (image.Format == ImageFormat.Rgba32)
{
data = image.Data;
stride = image.Stride;
}
else
{
int pixels = image.Width * image.Height;
data = new byte[pixels * 4];
stride = image.Width * 4;
switch (image.Format)
{
case ImageFormat.Rgba16:
case ImageFormat.R5g5b5a1:
{
for (int i = 0; i < pixels; i++)
{
data[i * 4 + 0] = image.Data[i * 4 + 2]; // B
data[i * 4 + 1] = image.Data[i * 4 + 1]; // G
data[i * 4 + 2] = image.Data[i * 4 + 0]; // R
data[i * 4 + 3] = image.Data[i * 4 + 3]; // A
}
}
break;
case ImageFormat.R5g5b5:
case ImageFormat.R5g6b5:
case ImageFormat.Rgb24:
{
for (int i = 0; i < pixels; i++)
{
data[i * 4 + 0] = image.Data[i * 3 + 2]; // B
data[i * 4 + 1] = image.Data[i * 3 + 1]; // G
data[i * 4 + 2] = image.Data[i * 3 + 0]; // R
data[i * 4 + 3] = 255; // A
}
}
break;
case ImageFormat.Rgb8:
{
for (int i = 0; i < pixels; i++)
{
var color = image.Data[i];
data[i * 4 + 0] = color;
data[i * 4 + 1] = color;
data[i * 4 + 2] = color;
data[i * 4 + 3] = 255;
}
}
break;
default:
return null;
}
}
// Pin the array and pass the pointer to Bitmap
var handle = GCHandle.Alloc(data, GCHandleType.Pinned);
try
{
var ptr = Marshal.UnsafeAddrOfPinnedArrayElement(data, 0);
var bitmap = new Bitmap(
Avalonia.Platform.PixelFormat.Bgra8888,
Avalonia.Platform.AlphaFormat.Unpremul,
ptr,
new Avalonia.PixelSize(image.Width, image.Height),
new Avalonia.Vector(96, 96),
stride);
return bitmap;
}
finally
{
handle.Free();
}
}
}
}