public RenderLayer(
IRenderLayerFactory factory,
Size size,
double scaling,
IVisual layerRoot)
{
_factory = factory;
Bitmap = factory.CreateLayer(layerRoot, size * scaling, 96 * scaling, 96 * scaling);
Size = size;
Scaling = scaling;
LayerRoot = layerRoot;
}
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);
}
public void ResizeBitmap(Size size, double scaling)
{
if (Size != size || Scaling != scaling)
{
var resized = _factory.CreateLayer(LayerRoot, size * scaling, 96 * scaling, 96 * scaling);
using (var context = resized.CreateDrawingContext(null))
{
context.Clear(Colors.Transparent);
context.DrawImage(Bitmap, 1, new Rect(Size), new Rect(Size));
Bitmap.Dispose();
Bitmap = resized;
Size = size;
}
}
}