private void CheckSourceFormat( PixelFormat pixelFormat )
{
if (
( pixelFormat != PixelFormat.Format24bppRgb ) &&
( pixelFormat != PixelFormat.Format32bppRgb ) &&
( pixelFormat != PixelFormat.Format32bppArgb ) )
{
throw new UnsupportedImageFormatException( "Source pixel format is not supported." );
}
}