public static BitmapImage GaussianBlur(BitmapSource image, float radius)
{
GaussianBlurFilter filter = new GaussianBlurFilter(radius);
using(var kimage = BitmapSourceToKaliko(image))
{
if (kimage == null)
return null;
var padding = (int)Math.Ceiling(radius);
kimage.Crop(-padding, padding, (int)image.Width + padding * 2, (int)image.Height + padding * 2);
kimage.ApplyFilter(filter);
return KalikoToBitmap(kimage);
}
}
private static void Sharpen(KalikoImage image, float amount, float radius, int threshold)
{
var inPixels = image.IntArray;
var workPixels = new int[inPixels.Length];
var outPixels = new int[inPixels.Length];
if (radius > 0)
{
var kernel = GaussianBlurFilter.CreateKernel(radius);
GaussianBlurFilter.ConvolveAndTranspose(kernel, inPixels, workPixels, image.Width, image.Height, true, true, false, ConvolveFilter.EdgeMode.Clamp);
GaussianBlurFilter.ConvolveAndTranspose(kernel, workPixels, outPixels, image.Height, image.Width, true, false, true, ConvolveFilter.EdgeMode.Clamp);
}
for (int index = 0; index < inPixels.Length; index++)
{
int rgb1 = inPixels[index];
int r1 = (rgb1 >> 16) & 0xff;
int g1 = (rgb1 >> 8) & 0xff;
int b1 = rgb1 & 0xff;
int rgb2 = outPixels[index];
int r2 = (rgb2 >> 16) & 0xff;
int g2 = (rgb2 >> 8) & 0xff;
int b2 = rgb2 & 0xff;
if (Math.Abs(r1 - r2) >= threshold)
{
r1 = PixelUtils.Clamp((int)((amount + 1) * (r1 - r2) + r2));
}
if (Math.Abs(g1 - g2) >= threshold)
{
g1 = PixelUtils.Clamp((int)((amount + 1) * (g1 - g2) + g2));
}
if (Math.Abs(b1 - b2) >= threshold)
{
b1 = PixelUtils.Clamp((int)((amount + 1) * (b1 - b2) + b2));
}
inPixels[index] = (int)(rgb1 & 0xff000000) | (r1 << 16) | (g1 << 8) | b1;
}
image.IntArray = inPixels;
}