iWall

Height of a wall. Walls are slices of a line that are too wide to be considered part of the line. Examples of walls include a character that a line passes through or a perpendicular line. If the image contains lines that pass through characters, set iWall to be equal to or a little larger than iMaxLineWidth. If LINE_USE_DPI is set in uFlags, units are in thousandths of an inch, otherwise units are in pixels.