// iddcx.h
struct IDARG_IN_GETDIRTYRECTS {
UINT DirtyRectInCount;
RECT *pDirtyRects;
};
View the official Windows Driver Kit DDI referenceNo description available.
Gives information about the parts of the surface that have changed since the last present.
DirtyRectInCount[in] Number of dirty rects in the pDirtyRects array
pDirtyRects[out] Pointer to the buffer where the OS can copy the dirty rects that indicate which parts of the surface have been changed since the last present.