X Server helper
Code from X11's region.h, Region.c, poly.h, and PolyReg.c
Used in Qt GUI (QRegion).
The sources can be found in tqtc-qt5/qtbase/src/gui/painting/qregion.cpp.
Copyright (c) 1987, 1988 X Consortium Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts.
X11 License and Historical Permission Notice and Disclaimer.
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