public static extern int DescribePixelFormat(IntPtr hdc, int n, int un,
ref PixelFormatDescriptor lpPixelFormatDescriptor);
/// <summary>
/// The DescribePixelFormat function obtains information about the pixel format identified by iPixelFormat
/// of the device associated with hdc. The function sets the members of the PIXELFORMATDESCRIPTOR structure
/// pointed to by lpPixelFormatDescriptor with that pixel format data
/// </summary>
/// <param name="hdc">Specifies the device context</param>
/// <param name="iPixelFormat">Index that specifies the pixel format. The pixel formats that a device context supports
/// are identified by positive one-based integer indexes</param>
/// <param name="nBytes">The size, in bytes, of the structure pointed to by lpPixelFormatDescriptor.
/// The DescribePixelFormat function stores no more than nBytes bytes of data to that structure.
/// Set this value to sizeof(PIXELFORMATDESCRIPTOR)</param>
/// <param name="lpPixelFormatDescriptor">Pointer to a PIXELFORMATDESCRIPTOR structure whose members the function sets
/// with pixel format data. The function stores the number of bytes copied to the structure in the structure's nSize member.
/// If, upon entry, lpPixelFormatDescriptor is null, the function writes no data to the structure. This is useful when you only want to obtain
/// the maximum pixel format index of a device context</param>
/// <returns>If the function succeeds, the return value is the maximum pixel format index of the device context. In addition, the function sets
/// the members of the PIXELFORMATDESCRIPTOR structure pointed to by lpPixelFormatDescriptor according to the specified pixel format.
/// </returns>
public static int DescribePixelFormat(IntPtr hdc, int iPixelFormat, int nBytes,
ref PixelFormatDescriptor lpPixelFormatDescriptor)
{
return Native.DescribePixelFormat(hdc, iPixelFormat, nBytes, ref lpPixelFormatDescriptor);
}