CompositionDrawingSurface ApplyBlurEffect(CanvasBitmap bitmap, Windows.UI.Composition.CompositionGraphicsDevice device, Size sizeTarget)
{
GaussianBlurEffect blurEffect = new GaussianBlurEffect()
{
Source = bitmap,
BlurAmount = 20.0f,
BorderMode = EffectBorderMode.Hard,
};
float fDownsample = .3f;
Size sizeSource = bitmap.Size;
if (sizeTarget == Size.Empty)
{
sizeTarget = sizeSource;
}
sizeTarget = new Size(sizeTarget.Width * fDownsample, sizeTarget.Height * fDownsample);
CompositionDrawingSurface blurSurface = device.CreateDrawingSurface(sizeTarget, DirectXPixelFormat.B8G8R8A8UIntNormalized, DirectXAlphaMode.Premultiplied);
using (var ds = CanvasComposition.CreateDrawingSession(blurSurface))
{
Rect destination = new Rect(0, 0, sizeTarget.Width, sizeTarget.Height);
ds.Clear(Windows.UI.Color.FromArgb(255, 255, 255, 255));
ds.DrawImage(blurEffect, destination, new Rect(0, 0, sizeSource.Width, sizeSource.Height));
}
return(blurSurface);
}
void ApplyBlurEffect(CompositionDrawingSurface surface, CanvasBitmap bitmap, Windows.UI.Composition.CompositionGraphicsDevice device)
{
GaussianBlurEffect blurEffect = new GaussianBlurEffect()
{
Source = bitmap,
BlurAmount = 40.0f,
BorderMode = EffectBorderMode.Hard,
};
using (var ds = CanvasComposition.CreateDrawingSession(surface))
{
ds.Clear(Color.FromArgb(255, 255, 255, 255));
ds.DrawImage(blurEffect);
}
}
