private IRenderTargetBitmapImpl GetOverlay(Size size, double scaling)
{
size = new Size(size.Width * scaling, size.Height * scaling);
if (_overlay == null ||
_overlay.PixelWidth != size.Width ||
_overlay.PixelHeight != size.Height)
{
_overlay?.Dispose();
_overlay = _layerFactory.CreateLayer(null, size, 96 * scaling, 96 * scaling);
}
return(_overlay);
}
private IRenderTargetBitmapImpl GetOverlay(
IDrawingContextImpl parentContext,
Size size,
double scaling)
{
var pixelSize = size * scaling;
if (_overlay == null ||
_overlay.PixelWidth != pixelSize.Width ||
_overlay.PixelHeight != pixelSize.Height)
{
_overlay?.Dispose();
_overlay = parentContext.CreateLayer(size);
}
return(_overlay);
}
private void RenderOverlay(Scene scene)
{
if (DrawDirtyRects)
{
var overlay = GetOverlay(scene.Size, scene.Scaling);
using (var context = overlay.CreateDrawingContext(this))
{
context.Clear(Colors.Transparent);
RenderDirtyRects(context);
}
}
else
{
_overlay?.Dispose();
_overlay = null;
}
}
