PixelFarm.Agg.RectInt.IntersectRectangles C# (CSharp) Method

        public bool IntersectRectangles(RectInt rectToCopy, RectInt rectToIntersectWith)
        {
            Left = rectToCopy.Left;
            Bottom = rectToCopy.Bottom;
            Right = rectToCopy.Right;
            Top = rectToCopy.Top;
            if (Left < rectToIntersectWith.Left) Left = rectToIntersectWith.Left;
            if (Bottom < rectToIntersectWith.Bottom) Bottom = rectToIntersectWith.Bottom;
            if (Right > rectToIntersectWith.Right) Right = rectToIntersectWith.Right;
            if (Top > rectToIntersectWith.Top) Top = rectToIntersectWith.Top;
            if (Left < Right && Bottom < Top)
            {
                return true;
            }

            return false;
        }

        public void CopyFrom(IImageReaderWriter sourceImage, RectInt sourceImageRect, int destXOffset, int destYOffset)
        {
            RectInt sourceImageBounds      = sourceImage.GetBounds();
            RectInt clippedSourceImageRect = new RectInt();

            if (clippedSourceImageRect.IntersectRectangles(sourceImageRect, sourceImageBounds))
            {
                RectInt destImageRect = clippedSourceImageRect;
                destImageRect.Offset(destXOffset, destYOffset);
                RectInt destImageBounds      = GetBounds();
                RectInt clippedDestImageRect = new RectInt();
                if (clippedDestImageRect.IntersectRectangles(destImageRect, destImageBounds))
                {
                    // we need to make sure the source is also clipped to the dest. So, we'll copy this back to source and offset it.
                    clippedSourceImageRect = clippedDestImageRect;
                    clippedSourceImageRect.Offset(-destXOffset, -destYOffset);
                    CopyFromNoClipping(sourceImage, clippedSourceImageRect, destXOffset, destYOffset);
                }
            }
        }