The Area Information Flags are used in the TAreaChangedEvent to further describe the shape of the changed area.
Currently Graphics32 defines these types:
const
// common cases
AREAINFO_RECT = $80000000;
AREAINFO_LINE = $40000000; // 24 bits for line width in pixels...
AREAINFO_ELLIPSE = $20000000;
AREAINFO_ABSOLUTE = $10000000;
AREAINFO_MASK = $FF000000;
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