Beispiel #1
0
        /// <summary>
        /// Creates the CompositionMask having the given size, geometry & brush
        /// </summary>
        /// <param name="size">Size of the mask</param>
        /// <param name="geometry">Geometry of the mask</param>
        /// <param name="brush">Brush to fill the geometry.</param>
        /// <returns>ICompositionMask</returns>
        public ICompositionMask CreateMask(Size size, CanvasGeometry geometry, ICanvasBrush brush)
        {
            // Initialize the mask
            ICompositionMask mask = new CompositionMask(this, size, geometry, brush);

            // Render the mask
            mask.Redraw();

            return(mask);
        }
        /// <summary>
        /// Creates a CompositionMask having the given size and geometry
        /// </summary>
        /// <param name="size">Size of the mask</param>
        /// <param name="geometry">Geometry of the mask</param>
        /// <returns></returns>
        public Task <ICompositionMask> CreateMaskAsync(Size size, CanvasGeometry geometry)
        {
            return(Task.Run(() =>
            {
                //
                // Since the drawing is done asynchronously and multiple threads could
                // be trying to get access to the device/surface at the same time, we need
                // to do any device/surface work under a lock.
                //
                lock (_drawingLock)
                {
                    ICompositionMask mask = new CompositionMask(this, size, geometry);

                    // Render the mask to the surface
                    using (var session = CanvasComposition.CreateDrawingSession((CompositionDrawingSurface)mask.Surface))
                    {
                        // If the geometry is not null then fill the geometry area
                        // with white. The rest of the area on the surface will be transparent.
                        // When this mask is applied to a visual, only the area that is white
                        // will be visible.
                        if (geometry != null)
                        {
                            session.Clear(Colors.Transparent);
                            session.FillGeometry(geometry, Colors.White);
                        }
                        else
                        {
                            // If the geometry is null, then the entire mask should be filled white
                            // so that the masked visual can be seen completely.
                            session.Clear(Colors.White);
                        }
                    }

                    return mask;
                }
            }));
        }