## Presentation Device Driver Reference for OS/2

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### 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