Add ITextureProvider.GetFromManifestResource(Assembly,string)

Dalamud/Utility/TexFileExtensions.cs

@@ -1,3 +1,7 @@
+using System.Runtime.CompilerServices;
+
+using Dalamud.Memory;
+
 using ImGuiScene;
 using Lumina.Data.Files;
 
@@ -28,4 +32,25 @@ public static class TexFileExtensions
 
         return dst;
     }
+
+    /// <summary>Determines if the given data is possibly a <see cref="TexFile"/>.</summary>
+    /// <param name="data">The data.</param>
+    /// <returns><c>true</c> if it should be attempted to be interpreted as a <see cref="TexFile"/>.</returns>
+    internal static unsafe bool IsPossiblyTexFile2D(ReadOnlySpan<byte> data)
+    {
+        if (data.Length < Unsafe.SizeOf<TexFile.TexHeader>())
+            return false;
+        fixed (byte* ptr = data)
+        {
+            ref readonly var texHeader = ref MemoryHelper.Cast<TexFile.TexHeader>((nint)ptr);
+            if ((texHeader.Type & TexFile.Attribute.TextureTypeMask) != TexFile.Attribute.TextureType2D)
+                return false;
+            if (!Enum.IsDefined(texHeader.Format))
+                return false;
+            if (texHeader.Width == 0 || texHeader.Height == 0)
+                return false;
+        }
+
+        return true;
+    }
 }