public static void WithPrimitiveBlend(this ID2D1DeviceContext context, D2D1_PRIMITIVE_BLEND mode, Action action)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (action == null)
{
throw new ArgumentNullException(nameof(action));
}
var old = context.GetPrimitiveBlend();
try
{
context.SetPrimitiveBlend(mode);
action();
}
finally
{
context.SetPrimitiveBlend(old);
}
}
