private async void OnUriChanged()
{
if (_uri == null)
{
ReleaseContent();
return;
}
_surface = await SurfaceLoader.LoadFromUri(_uri);
if (_loadEffectDelegate != null)
{
_effectSurface = await SurfaceLoader.LoadFromUri(_uri, Size.Empty, _loadEffectDelegate);
}
// Async operations may take a while. If we've unloaded, return now.
if (_unloaded)
{
ReleaseContent();
return;
}
// Apply stretching policy
ApplyStretchingPolicy(new Size(ActualWidth, ActualHeight));
if (_effectBrush == null)
{
CompositionSurfaceBrush brush = (CompositionSurfaceBrush)_sprite.Brush;
if (brush != null)
{
brush.Surface = _surface;
}
else
{
_sprite.Brush = _compositor.CreateSurfaceBrush(_surface);
}
}
else
{
_effectBrush.SetSourceParameter("ImageSource", _compositor.CreateSurfaceBrush(_surface));
if (_effectSurface != null)
{
_effectBrush.SetSourceParameter("EffectSource", _compositor.CreateSurfaceBrush(_effectSurface));
}
_sprite.Brush = _effectBrush;
}
}
public async void SetEffectBrush(CompositionEffectBrush brush)
{
// Release previous brush if set
if (_effectBrush != null)
{
_effectBrush.Dispose();
_effectBrush = null;
}
if (_effectSurface != null)
{
_effectSurface.Dispose();
_effectSurface = null;
}
_effectBrush = brush;
// Set the new brush
if (_sprite != null)
{
// Release current brush
if (_sprite.Brush != null)
{
_sprite.Brush.Dispose();
}
if (_surface != null)
{
// If the effect brush is cleared, create a surface brush
if (_effectBrush == null)
{
_sprite.Brush = _compositor.CreateSurfaceBrush(_surface);
}
else
{
_effectBrush.SetSourceParameter("ImageSource", _compositor.CreateSurfaceBrush(_surface));
if (_loadEffectDelegate != null)
{
_effectSurface = await SurfaceLoader.LoadFromUri(_uri, Size.Empty, _loadEffectDelegate);
_effectBrush.SetSourceParameter("EffectSource", _compositor.CreateSurfaceBrush(_effectSurface));
}
_sprite.Brush = _effectBrush;
}
}
}
}