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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _imagesize functions return the number of bytes needed to
     store the image defined by the bounding rectangle. The rectangle
     is specified by the coordinates given in the function call.
 
     The _imagesize function defines the bounding rectangle in terms of
     the view-coordinate points (<x1>, <y1>) and (<x2>, <y2>).
 
     The _imagesize_w function defines the bounding rectangle in terms
     of the window-coordinate points (<wx1>, <wy1>) and (<wx2>, <wy2>).
 
     The _imagesize_wxy function defines the bounding rectangle in
     terms of the window-coordinate pairs (<pwxy1>) and (<pwxy2>).
 
     The _imagesize_w and _imagesize_wxy functions are implemented as
     macros.
 
     Return Value
 
     The function returns the storage size of the image in bytes. There
     is no error return.
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