protected abstract void DrawBackground(UIntPtr hdc, string image, background_repeat repeat, ref web_color color, ref position pos, ref border_radiuses borderRadiuses, ref position borderBox, bool isRoot);
// -----
private void DrawBackgroundScaled(UIntPtr hdc, Utf8Str image, background_repeat repeat, ref web_color color, ref position pos, ref border_radiuses borderRadiuses, ref position borderBox, bool isRoot)
{
pos.Scale(ScaleFactor);
borderRadiuses.Scale(ScaleFactor);
borderBox.Scale(ScaleFactor);
DrawBackground(hdc, Utf8Util.Utf8PtrToString(image), repeat, ref color, ref pos, ref borderRadiuses, ref borderBox, isRoot);
}