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
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