//Applies the current special effect and stores it
private void ApplyEffect()
{
if (SpecialEffect == null)
{
EffectImage = null;
return;
}
BitmapSource b = null;
int[] sourceImagePixels = null;
int sourceWidth = -1;
int sourceHeight = -1;
Dispatcher.Invoke(DispatcherPriority.Normal,
new DispatcherOperationCallback(delegate(object arg)
{
BitmapSource bitmap = SourceImage;
sourceWidth = bitmap.PixelWidth;
sourceHeight = bitmap.PixelHeight;
sourceImagePixels = new int[sourceWidth * sourceHeight * 4];
bitmap.CopyPixels(sourceImagePixels, sourceWidth * 4, 0);
return(null);
}
), null);
if (sourceWidth < 0 || sourceHeight < 0 || sourceImagePixels == null)
{
return;
}
//Clone so that this thread owns the image
b = BitmapSource.Create(sourceWidth, sourceHeight, 96, 96, PixelFormats.Bgra32,
null, sourceImagePixels, sourceWidth * 4);
b = SpecialEffect.ExecuteFilter(b);
//It is necessary to pass the pixels raw between threads
// to avoid cross thread calls to wpf objects
int[] p = new int[b.PixelWidth * b.PixelHeight];
b.CopyPixels(p, b.PixelWidth * 4, 0);
int width = b.PixelWidth;
int height = b.PixelHeight;
PixelFormat format = b.Format;
Dispatcher.BeginInvoke(DispatcherPriority.Normal,
new DispatcherOperationCallback(delegate(object arg)
{
EffectImage = BitmapSource.Create(width, height, 96, 96, format,
null, p, width * 4);
return(null);
}
), null);
}
