2.2.4.11.5 Surface_MarkContentValid
The Surface_MarkcontentValid message marks this surface as having valid content. This message enables an application to use a surface for drawing after setting the SurfacePool's underlying surface. This function can be used very carefully as it marks the content as valid, regardless of whether valid content has actually been set.
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_size (4 bytes): An unsigned 32-bit integer. The total message size, in bytes.
_msgid (4 bytes): A signed 32-bit integer. The message ID that is unique to the specific target. The _msgid value is 0x00000004 for this message.
_idObjectSubject (4 bytes): An unsigned 32-bit integer. The ID of the target object.