IMAGEPACK Field - ulCmdMask

 ulCmdMask (ULONG) 
    Specific changes since the last frame. 

    The following values are valid: 

    IPC_INTERMEDIATE_PUT 
                   0x0001; not used at this time 
    IPC_RECTLS 
                   0x0002; visible regions have changed 
    IPC_SRC_COLOR 
                   0x0004; source color information has changed 
    IPC_DST_COLOR 
                   0x0008; destination color information has changed 
    IPC_PALETTE 
                   0x0010; palette color information has changed 
    IPC_SRC_SIZE 
                   0x0020; source size information has changed 
    IPC_DST_SIZE 
                   0x0040; destination size information has changed 
    IPC_DST_POS 
                   0x0080; destination position information has changed 
    IPC_DROP_FRAME 
                   0x0100; ignore this frame