public RectangleF GetBounds()
 {
     lock (SyncRoot) {
         using (SystemLayer.NullGraphics nullGraphics = new SystemLayer.NullGraphics()) {
             return(gdiRegion.GetBounds(nullGraphics.Graphics));
         }
     }
 }
Example #2
0
        /// <summary>
        /// Retrieves an array of rectangles that approximates a region, and computes the
        /// pixel area of it. This method is necessary to work around some bugs in .NET
        /// and to increase performance for the way in which we typically use this data.
        /// </summary>
        /// <param name="region">The Region to retrieve data from.</param>
        /// <param name="scans">An array of Rectangle to put the scans into.</param>
        /// <param name="area">An integer to write the computed area of the region into.</param>
        /// <remarks>
        /// Note to implementors: Simple implementations may simple call region.GetRegionScans()
        /// and process the data for the 'out' variables.</remarks>
        public static void GetRegionScans(Region region, out Rectangle[] scans, out int area)
        {
            using (NullGraphics nullGraphics = new NullGraphics()) {
                IntPtr hRgn = IntPtr.Zero;

                try {
                    hRgn = region.GetHrgn(nullGraphics.Graphics);
                    GetRegionScans(hRgn, out scans, out area);
                } finally {
                    if (hRgn != IntPtr.Zero)
                    {
                        SafeNativeMethods.DeleteObject(hRgn);
                        hRgn = IntPtr.Zero;
                    }
                }
            }

            GC.KeepAlive(region);
        }
Example #3
0
        /// <summary>
        /// Retrieves an array of rectangles that approximates a region, and computes the
        /// pixel area of it. This method is necessary to work around some bugs in .NET
        /// and to increase performance for the way in which we typically use this data.
        /// </summary>
        /// <param name="region">The Region to retrieve data from.</param>
        /// <param name="scans">An array of Rectangle to put the scans into.</param>
        /// <param name="area">An integer to write the computed area of the region into.</param>
        /// <remarks>
        /// Note to implementors: Simple implementations may simple call region.GetRegionScans()
        /// and process the data for the 'out' variables.</remarks>
        public static void GetRegionScans(Region region, out Rectangle[] scans, out int area)
        {
            using (NullGraphics nullGraphics = new NullGraphics())
            {
                IntPtr hRgn = IntPtr.Zero;

                try
                {
                    hRgn = region.GetHrgn(nullGraphics.Graphics);
                    GetRegionScans(hRgn, out scans, out area);
                }

                finally
                {
                    if (hRgn != IntPtr.Zero)
                    {
                        SafeNativeMethods.DeleteObject(hRgn);
                        hRgn = IntPtr.Zero;
                    }
                }
            }

            GC.KeepAlive(region);
        }
Example #4
0
 public RectangleF GetBounds()
 {
     lock (SyncRoot)
     {
         using (SystemLayer.NullGraphics nullGraphics = new SystemLayer.NullGraphics())
         {
             return gdiRegion.GetBounds(nullGraphics.Graphics);
         }
     }
 }