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overlay, overwrite, copywin - overlay and manipulate overlapped curses windows |
#include <curses.h> int overlay(const WINDOW *srcwin, WINDOW *dstwin); |
The overlay and overwrite routines overlay srcwin on top of dstwin. scrwin and dstwin are not required to be the same size; only text where the two windows overlap is copied. The difference is that overlay is non-destructive (blanks are not copied) whereas overwrite is destructive. The copywin routine provides a finer granularity of control over the overlay and overwrite routines. Like in the prefresh routine, a rectangle is specified in the destination window, (dminrow, dmincol) and (dmaxrow, dmaxcol), and the upper-left-corner coordinates of the source window, (sminrow, smincol). If the argument overlay is true, then copying is non-destructive, as in overlay. |
Routines that return an integer return ERR upon failure, and OK (SVr4 only specifies "an integer value other than ERR") upon successful completion. |
Note that overlay and overwrite may be macros. |
The XSI Curses standard, Issue 4 describes these functions (adding the const qualifiers). It further specifies their behavior in the presence of characters with multi-byte renditions (not yet supported in this implementation). |
curses(3X), curs_pad(3X), curs_refresh(3X) |