/// <summary>
/// Helper class to redraw the IImageSurface asynchronously
/// </summary>
/// <returns>Task</returns>
private async Task RedrawSurfaceAsync()
{
// Cache the canvasBitmap to avoid reloading of the same image during Resize/Redraw operations
_canvasBitmap = await _generator.RedrawImageSurfaceAsync(_surfaceLock, _surface, _uri, Options, _canvasBitmap);
// If AutoResize is allowed and the image is successfully loaded into the canvasBitmap,
// then update the Size property of the surface as the surface has been resized to match the canvasBitmap size
if (Options.AutoResize)
{
// If the image is successfully loaded into the canvasBitmap, then update the Size property
// of the surface as the surface has been resized to match the canvasBitmap size
Size = _canvasBitmap?.Size ?? new Size(0, 0);
}
Status = _canvasBitmap != null ? ImageSurfaceLoadStatus.Success : ImageSurfaceLoadStatus.Error;
// Get the canvasbitmap dimensions
if (_canvasBitmap != null)
{
DecodedPhysicalSize = new Size(_canvasBitmap.SizeInPixels.Width, _canvasBitmap.SizeInPixels.Height);
DecodedSize = _canvasBitmap.Size;
}
// Raise the event
if (_raiseLoadCompletedEvent)
{
LoadCompleted?.Invoke(this, Status);
_raiseLoadCompletedEvent = false;
}
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="generator">ICompositionMaskGeneratorInternal object</param>
/// <param name="uri">Uri of the image to be loaded onto the IImageSurface.</param>
/// <param name="size">Size of the IImageSurface</param>
/// <param name="options">The image's resize and alignment options in the allocated space.</param>
public ImageSurface(ICompositionGeneratorInternal generator, Uri uri, Size size, ImageSurfaceOptions options)
{
_generator = generator ?? throw new ArgumentNullException(nameof(generator), "CompositionGenerator cannot be null!");
_surfaceLock = new object();
// Create the Surface of the IImageSurface
_surface = _generator.CreateDrawingSurface(_surfaceLock, size);
Size = _surface?.Size ?? new Size(0, 0);
_uri = uri;
_raiseLoadCompletedEvent = _uri != null;
_canvasBitmap = null;
// Set the image options
Options = options;
// Subscribe to DeviceReplaced event
_generator.DeviceReplaced += OnDeviceReplaced;
Status = ImageSurfaceLoadStatus.None;
}
/// <summary>
/// Helper class to redraw the IImageSurface synchronously
/// </summary>
private void RedrawSurface()
{
// Resize the surface image
_generator.RedrawImageSurface(_surfaceLock, _surface, Options, _canvasBitmap);
// If AutoResize is allowed and the image is successfully loaded into the canvasBitmap,
// then update the Size property of the surface as the surface has been resized to match the canvasBitmap size
if (Options.AutoResize)
{
// If the image is successfully loaded into the canvasBitmap, then update the Size property
// of the surface as the surface has been resized to match the canvasBitmap size
Size = _canvasBitmap?.Size ?? new Size(0, 0);
}
Status = _canvasBitmap != null ? ImageSurfaceLoadStatus.Success : ImageSurfaceLoadStatus.Error;
if (_canvasBitmap != null)
{
DecodedPhysicalSize = new Size(_canvasBitmap.SizeInPixels.Width, _canvasBitmap.SizeInPixels.Height);
DecodedSize = _canvasBitmap.Size;
}
}
