The clipping rectangle pointed to by this parameter is defined as a RECTL
structure:
xLeft
Minimum X-coordinate of rectangle
yBottom
Minimum Y-coordinate
xRight
Maximum X-coordinate of rectangle
yTop
Maximum Y-coordinate
This
rectangle, which is in world coordinates, is used as the clipping rectangle
or as the background for the string, or both, depending on the value of
flOptions. When the CHS_OPAQUE flag is set, normal background mix attributes
are ignored and the rectangle is drawn using overpaint and the character
background color attribute. When the CHS_OPAQUE is not set, the background
is drawn using the normal method. When neither CHS_OPAQUE nor CHS_CLIP are
specified, this parameter is ignored. Notice that points on the boundary
of this rectangle are considered to be inside the rectangle.