public override void PostProcess(SKCanvas canvas, SKRect bounds, SKPaint paint)
{
paint.ImageFilter = SKImageFilter.CreateErode(
(int)Properties.ErodeRadius.CurrentValue.Width,
(int)Properties.ErodeRadius.CurrentValue.Height,
paint.ImageFilter
);
}
protected override void OnDrawSample(SKCanvas canvas, int width, int height)
{
canvas.Clear(SKColors.White);
using (var stream = new SKManagedStream(SampleMedia.Images.Baboon))
using (var bitmap = SKBitmap.Decode(stream))
using (var filter = SKImageFilter.CreateErode(5, 5))
using (var paint = new SKPaint())
{
paint.ImageFilter = filter;
canvas.DrawBitmap(bitmap, SKRect.Create(width, height), paint);
}
}
public static SKImage ApplyErode(SKImage image, int degree)
{
var skErode = SKImageFilter.CreateErode(degree, degree);
var skSurface = SKSurface.Create(new SKImageInfo(100, 100));
var skCanvas = skSurface.Canvas;
var Paint = new SKPaint();
Paint.ImageFilter = skErode;
skCanvas.Clear();
skCanvas.DrawImage(image, 0, 0, Paint);
var img = skSurface.Snapshot();
skCanvas.Dispose();
skSurface.Dispose();
return(img);
}
public static SKImage ApplyNoise(SKImage image)
{
var skSurface = SKSurface.Create(new SKImageInfo(100, 100));
var skCanvas = skSurface.Canvas;
skCanvas.Clear();
var skPaint = new SKPaint();
if (StaticRandom.Instance.NextDouble() < 0.5)
{
skPaint.ImageFilter = SKImageFilter.CreateDilate(StaticRandom.Instance.Next(0, 2), StaticRandom.Instance.Next(0, 2));
}
else
{
skPaint.ImageFilter = SKImageFilter.CreateErode(StaticRandom.Instance.Next(0, 3), StaticRandom.Instance.Next(0, 3));
}
if (StaticRandom.Instance.NextDouble() < 0.5)
{
var noiseSize = 3;
var noiseCount = 20;
for (var i = 0; i < noiseCount; i++)
{
var x = StaticRandom.Instance.Next(0, 100 - noiseSize);
var y = StaticRandom.Instance.Next(0, 100 - noiseSize);
skCanvas.DrawRect(new SKRect(x, y, x + noiseSize, y + noiseSize), new SKPaint {
Color = SKColors.White
});
}
}
skCanvas.DrawImage(image, 0, 0, skPaint);
var img = skSurface.Snapshot();
skCanvas.Dispose();
skSurface.Dispose();
return(img);
}
