vendoring NetVips

vendor/NetVips/net6.0/Source.cs

@@ -0,0 +1,47 @@
+#if NET6_0_OR_GREATER
+
+using System;
+
+namespace NetVips;
+
+/// <summary>
+/// An input connection.
+/// </summary>
+public partial class Source
+{
+    /// <summary>
+    /// Make a new source from a memory object.
+    /// </summary>
+    /// <remarks>
+    /// Make a new source that is attached to the memory object. For example:
+    /// <code language="lang-csharp">
+    /// using var source = Source.NewFromMemory(data);
+    /// </code>
+    /// You can pass this source to (for example) <see cref="Image.NewFromSource"/>.
+    /// </remarks>
+    /// <param name="data">The memory object.</param>
+    /// <returns>A new <see cref="Source"/>.</returns>
+    /// <exception cref="VipsException">If unable to create a new <see cref="Source"/> from <paramref name="data"/>.</exception>
+    public static unsafe Source NewFromMemory(ReadOnlySpan<byte> data)
+    {
+        fixed (byte* dataFixed = data)
+        {
+            var ptr = Internal.VipsBlob.Copy(dataFixed, (nuint)data.Length);
+            if (ptr == IntPtr.Zero)
+            {
+                throw new VipsException("can't create input source from memory");
+            }
+
+            using var blob = new VipsBlob(ptr);
+            var pointer = Internal.VipsSource.NewFromBlob(blob);
+            if (pointer == IntPtr.Zero)
+            {
+                throw new VipsException("can't create input source from memory");
+            }
+
+            return new Source(pointer);
+        }
+    }
+}
+
+#endif