public void Render(IDrawingContextImpl context)
{
if (context is not ISkiaDrawingContextImpl skia)
{
return;
}
if (!skia.SkCanvas.TotalMatrix.TryInvert(out var currentInvertedTransform))
{
return;
}
// One or both dimensions has zero size.
// Skia doesnt like that.
if (_bounds.Size.AspectRatio == 0)
{
return;
}
using var backgroundSnapshot = skia.SkSurface.Snapshot();
using var preBlur =
DrawingContextHelper.CreateDrawingContext(
new Size(backgroundSnapshot.Width, backgroundSnapshot.Height), new Vector(96, 96),
skia.GrContext);
using (var filter = SKImageFilter.CreateBlur((int)_blurRadius.X, (int)_blurRadius.Y, SKShaderTileMode.Clamp))
using (var blurPaint = new SKPaint {
ImageFilter = filter
})
{
var canvas = preBlur.SkSurface.Canvas;
canvas.DrawSurface(skia.SkSurface, 0f, 0f, blurPaint);
canvas.Flush();
}
using var preBlurredSnapshot = preBlur.SkSurface.Snapshot();
using var backdropShader = SKShader.CreateImage(preBlurredSnapshot, SKShaderTileMode.Clamp,
SKShaderTileMode.Clamp, currentInvertedTransform);
using var blurred = DrawingContextHelper.CreateDrawingContext(_bounds.Size, new Vector(96, 96), skia.GrContext);
using (var blurPaint = new SKPaint {
Shader = backdropShader
})
{
blurred.SkSurface.Canvas.DrawRect(0, 0, (float)_bounds.Width, (float)_bounds.Height, blurPaint);
}
blurred.DrawTo(skia);
}
internal override void UpdatePaint(SKPaint fillPaint, SKRect bounds)
{
if (Surface is SkiaCompositionSurface scs)
{
var imageShader = SKShader.CreateImage(scs.Image, SKShaderTileMode.Repeat, SKShaderTileMode.Repeat, TransformMatrix.ToSKMatrix());
var opacity = 255 * Compositor.CurrentOpacity;
var filteredImageShader = SKShader.CreateColorFilter(imageShader, SKColorFilter.CreateBlendMode(new SKColor(0xFF, 0xFF, 0xFF, (byte)opacity), SKBlendMode.Modulate));
fillPaint.Shader = filteredImageShader;
fillPaint.IsAntialias = true;
}
else
{
fillPaint.Shader = null;
}
}
public bool Draw(SKCanvas canvas, IReadOnlyViewport viewport, ILayer layer, IFeature feature, IStyle istyle,
ISymbolCache symbolCache)
{
var style = ((TiledBitmapStyle)istyle);
if (style.image == null)
{
return(false);
}
var position = feature.Geometry.BoundingBox.Centroid;
var dest = viewport.WorldToScreen(position);
var zoom = 1 / (float)viewport.Resolution;
canvas.Translate((float)dest.X, (float)dest.Y);
canvas.Scale(zoom, zoom);
canvas.RotateDegrees((float)viewport.Rotation, 0.0f, 0.0f);
if (style.rotation != 0)
{
canvas.RotateDegrees(style.rotation, 0.0f, 0.0f);
}
//#TODO store paint with shader in the style
using (SKPaint paint = new SKPaint())
{
if (style.rotation == 0) //Weird artifacting on 0 rotation, no idea why. Seems Skia bug.
{
style.rotation = 180;
}
SKMatrix shaderTransform =
SKMatrix.CreateScale((float)viewport.Resolution, (float)viewport.Resolution);
if (style.rotation != 0)
{
shaderTransform = SKMatrix.Concat(shaderTransform, SKMatrix.CreateRotationDegrees(-style.rotation));
}
paint.Shader = SKShader.CreateImage(style.image, SKShaderTileMode.Repeat, SKShaderTileMode.Repeat, shaderTransform);
paint.ColorFilter = style.colorFilter;
//style.image.Encode().SaveTo(File.Create($"P:/{style.image.UniqueId}.png"));
if (style.ellipse)
{
canvas.DrawOval(0, 0, style.rect.Right, style.rect.Bottom, paint);
}
else
{
canvas.DrawRect(style.rect, paint);
}
if (style.border)
{
var borderPaint = new SKPaint
{
Style = SKPaintStyle.Stroke,
Color = style.color
};
if (style.ellipse)
{
canvas.DrawOval(0, 0, style.rect.Right, style.rect.Bottom, borderPaint);
}
else
{
canvas.DrawRect(style.rect, borderPaint);
}
}
}
return(true);
}
