public override void PreProcess(SKCanvas canvas, SKRect bounds, SKPaint paint)
{
paint.ImageFilter = SKImageFilter.CreateDilate(
(int)Properties.DilateRadius.CurrentValue.Width,
(int)Properties.DilateRadius.CurrentValue.Height,
paint.ImageFilter
);
}
public override void PostProcess(SKCanvas canvas, SKImageInfo canvasInfo, SKPath renderBounds, SKPaint paint)
{
paint.ImageFilter = SKImageFilter.CreateDilate(
(int)Properties.DilateRadius.CurrentValue.Width,
(int)Properties.DilateRadius.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.CreateDilate(5, 5))
using (var paint = new SKPaint())
{
paint.ImageFilter = filter;
canvas.DrawBitmap(bitmap, SKRect.Create(width, height), paint);
}
}
private void ApplyFilters(SKPaint paint, RasterizeLayerStyleDefinition layerStyleDef, RasterizeLayerStyle layerStyle)
{
paint.ColorFilter = SKColorFilter.CreateBlendMode(layerStyleDef.Color, SKBlendMode.SrcIn);
if (layerStyleDef.IsBlurEnabled && layerStyleDef.IsDilateEnabled)
{
paint.ImageFilter = SKImageFilter.CreateBlur(layerStyle.Blur.X, layerStyle.Blur.Y,
SKImageFilter.CreateDilate((int)layerStyle.Dilate.X, (int)layerStyle.Dilate.Y));
}
else if (layerStyleDef.IsBlurEnabled)
{
paint.ImageFilter = SKImageFilter.CreateBlur(layerStyle.Blur.X, layerStyle.Blur.Y);
}
else if (layerStyleDef.IsDilateEnabled)
{
paint.ImageFilter = SKImageFilter.CreateDilate((int)layerStyle.Dilate.X, (int)layerStyle.Dilate.Y);
}
}
public static SKImage ApplyDilate(SKImage image, int degree)
{
var skErode = SKImageFilter.CreateDilate(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();
Paint.Dispose();
skErode.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);
}
void OnCanvasViewPaintSurface(object sender, SKPaintSurfaceEventArgs args)
{
SKImageInfo info = args.Info;
SKSurface surface = args.Surface;
SKCanvas canvas = surface.Canvas;
canvas.Clear(SKColors.Pink);
// Get values from sliders
float sigmaX = (float)sigmaXSlider.Value;
float sigmaY = (float)sigmaYSlider.Value;
using (SKPaint paint = new SKPaint())
{
// Set SKPaint properties
paint.TextSize = (info.Width - 100) / (TEXT.Length / 2);
paint.ImageFilter = SKImageFilter.CreateDilate((int)(sigmaX), (int)(sigmaY)); // .CreateBlur(sigmaX, sigmaY);
// Get text bounds and calculate display rectangle
SKRect textBounds = new SKRect();
paint.MeasureText(TEXT, ref textBounds);
SKRect textRect = new SKRect(0, 0, info.Width, textBounds.Height + 50);
// Center the text in the display rectangle
float xText = textRect.Width / 2 - textBounds.MidX;
float yText = textRect.Height / 2 - textBounds.MidY;
canvas.DrawText(TEXT, xText, yText, paint);
// Calculate rectangle for bitmap
SKRect bitmapRect = new SKRect(0, textRect.Bottom, info.Width, info.Height);
bitmapRect.Inflate(-50, -50);
canvas.DrawBitmap(bitmap, bitmapRect, BitmapStretch.Uniform, paint: paint);
}
}
