private void FillOpaqueRectangleW32(Color color, int x, int y, int width, int height)
{
// todo: check that width and height are exact
RECT rect = new RECT {
left = x, top = y, right = x + width, bottom = y + height
};
var brush = objectCache.GetSolidBrush(color);
Win32API.FillRect(hdc, ref rect, brush);
}