public override void DrawLayer(BitmapCanvas canvas, DenseMatrix parentMatrix, byte parentAlpha)
{
var bitmap = Bitmap;
if (bitmap == null)
{
return;
}
_paint.Alpha = parentAlpha;
canvas.Save();
canvas.Concat(parentMatrix);
RectExt.Set(ref _src, 0, 0, PixelWidth, PixelHeight);
RectExt.Set(ref _dst, 0, 0, (int)(PixelWidth * _density), (int)(PixelHeight * _density));
canvas.DrawBitmap(bitmap, _src, _dst, _paint);
canvas.Restore();
}