A bit of refactoring to be able to find some issue...

GreenshotPlugin/UnmanagedHelpers/Structs/RECTF.cs

@@ -0,0 +1,102 @@
+using System.Drawing;
+using System.Runtime.InteropServices;
+
+namespace GreenshotPlugin.UnmanagedHelpers.Structs
+{
+    /// <summary>
+    /// A floating point GDI Plus width/hight based rectangle.
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential)]
+    public struct RECTF {
+        /// <summary>
+        /// The X corner location of the rectangle.
+        /// </summary>
+        public float X;
+
+        /// <summary>
+        /// The Y corner location of the rectangle.
+        /// </summary>
+        public float Y;
+
+        /// <summary>
+        /// The width of the rectangle.
+        /// </summary>
+        public float Width;
+
+        /// <summary>
+        /// The height of the rectangle.
+        /// </summary>
+        public float Height;
+
+        /// <summary>
+        /// Creates a new GDI Plus rectangle.
+        /// </summary>
+        /// <param name="x">The X corner location of the rectangle.</param>
+        /// <param name="y">The Y corner location of the rectangle.</param>
+        /// <param name="width">The width of the rectangle.</param>
+        /// <param name="height">The height of the rectangle.</param>
+        public RECTF(float x, float y, float width, float height) {
+            X = x;
+            Y = y;
+            Width = width;
+            Height = height;
+        }
+
+        /// <summary>
+        /// Creates a new GDI Plus rectangle from a System.Drawing.RectangleF.
+        /// </summary>
+        /// <param name="rect">The rectangle to base this GDI Plus rectangle on.</param>
+        public RECTF(RectangleF rect) {
+            X = rect.X;
+            Y = rect.Y;
+            Width = rect.Width;
+            Height = rect.Height;
+        }
+
+        /// <summary>
+        /// Creates a new GDI Plus rectangle from a System.Drawing.Rectangle.
+        /// </summary>
+        /// <param name="rect">The rectangle to base this GDI Plus rectangle on.</param>
+        public RECTF(Rectangle rect) {
+            X = rect.X;
+            Y = rect.Y;
+            Width = rect.Width;
+            Height = rect.Height;
+        }
+
+        /// <summary>
+        /// Returns a RectangleF for this GDI Plus rectangle.
+        /// </summary>
+        /// <returns>A System.Drawing.RectangleF structure.</returns>
+        public RectangleF ToRectangle() {
+            return new RectangleF(X, Y, Width, Height);
+        }
+
+        /// <summary>
+        /// Returns a RectangleF for a GDI Plus rectangle.
+        /// </summary>
+        /// <param name="rect">The GDI Plus rectangle to get the RectangleF for.</param>
+        /// <returns>A System.Drawing.RectangleF structure.</returns>
+        public static RectangleF ToRectangle(RECTF rect) {
+            return rect.ToRectangle();
+        }
+
+        /// <summary>
+        /// Returns a GDI Plus rectangle for a RectangleF structure.
+        /// </summary>
+        /// <param name="rect">The RectangleF to get the GDI Plus rectangle for.</param>
+        /// <returns>A GDI Plus rectangle structure.</returns>
+        public static RECTF FromRectangle(RectangleF rect) {
+            return new RECTF(rect);
+        }
+
+        /// <summary>
+        /// Returns a GDI Plus rectangle for a Rectangle structure.
+        /// </summary>
+        /// <param name="rect">The Rectangle to get the GDI Plus rectangle for.</param>
+        /// <returns>A GDI Plus rectangle structure.</returns>
+        public static RECTF FromRectangle(Rectangle rect) {
+            return new RECTF(rect);
+        }
+    }
+}