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### Rectangle Arithmetic Functions

These global macros provide simplified support for managing rectangles and performing simple arithmetic on them. Note that all these functions are actually implemented as C style macros for performance.

GA_equalRect | GA_emptyRect
GA_disjointRect | GA_sectRect
GA_sectRectFast | GA_sectRectCoord
GA_sectRectFastCoord | GA_unionRect
GA_unionRectCoord | GA_offsetRect
GA_insetRect | GA_ptInRect

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