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120 lines
4.7 KiB
Plaintext
120 lines
4.7 KiB
Plaintext
.\"***************************************************************************
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.\" Copyright 2020-2024,2025 Thomas E. Dickey *
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.\" Copyright 1998-2013,2015 Free Software Foundation, Inc. *
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.\" *
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.\" Permission is hereby granted, free of charge, to any person obtaining a *
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.\" copy of this software and associated documentation files (the *
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.\" "Software"), to deal in the Software without restriction, including *
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.\" without limitation the rights to use, copy, modify, merge, publish, *
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.\" distribute, distribute with modifications, sublicense, and/or sell *
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.\" copies of the Software, and to permit persons to whom the Software is *
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.\" furnished to do so, subject to the following conditions: *
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.\" *
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.\" The above copyright notice and this permission notice shall be included *
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.\" in all copies or substantial portions of the Software. *
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.\" *
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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.\" *
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.\" Except as contained in this notice, the name(s) of the above copyright *
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.\" holders shall not be used in advertising or otherwise to promote the *
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.\" sale, use or other dealings in this Software without prior written *
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.\" authorization. *
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.\"***************************************************************************
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.\"
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.\" $Id: curs_overlay.3x,v 1.55 2025/01/19 00:51:10 tom Exp $
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.TH curs_overlay 3X 2025-01-18 "ncurses @NCURSES_MAJOR@.@NCURSES_MINOR@" "Library calls"
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.ie \n(.g \{\
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.ds `` \(lq
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.ds '' \(rq
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.\}
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.el \{\
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.ie t .ds `` ``
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.el .ds `` ""
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.ie t .ds '' ''
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.el .ds '' ""
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.\}
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.
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.de bP
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.ie n .IP \(bu 4
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.el .IP \(bu 2
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..
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.SH NAME
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\fB\%overlay\fP,
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\fB\%overwrite\fP,
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\fB\%copywin\fP \-
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overlay \fIcurses\fR windows and manipulate them
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.SH SYNOPSIS
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.nf
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\fB#include <curses.h>
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.PP
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\fBint overlay(const WINDOW *\fIsrcwin\fP, WINDOW *\fIdstwin\fP);
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\fBint overwrite(const WINDOW *\fIsrcwin\fP, WINDOW *\fIdstwin\fP);
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\fBint copywin(const WINDOW *\fIsrcwin\fP, WINDOW *\fIdstwin\fP, int \fIsminrow\fP,
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\fBint \fIsmincol\fB, int \fIdminrow\fB, int \fIdmincol\fB, int \fIdmaxrow\fB,\fR
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\fBint \fIdmaxcol\fB, int \fIoverlay\fB);\fR
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.fi
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.SH DESCRIPTION
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.SS "overlay, overwrite"
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The \fBoverlay\fP and \fBoverwrite\fP routines overlay \fIsrcwin\fP on
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top of \fIdstwin\fP.
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\fIscrwin\fP and \fIdstwin\fP are not required
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to be the same size; only text where the two windows overlap is copied.
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The difference is that \fBoverlay\fP is non-destructive
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(blanks are not copied) whereas \fBoverwrite\fP is destructive.
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.SS copywin
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The \fBcopywin\fP routine provides a finer granularity of control over the
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\fBoverlay\fP and \fBoverwrite\fP routines.
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As in the \fBprefresh\fP routine,
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a rectangle is specified in the destination window, (\fIdminrow\fP,
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\fIdmincol\fP) and (\fIdmaxrow\fP, \fIdmaxcol\fP), and the upper-left-corner
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coordinates of the source window, (\fIsminrow\fP, \fIsmincol\fP).
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If the argument \fIoverlay\fP is \fBtrue\fP,
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then copying is non-destructive,
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as in \fBoverlay\fP.
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.SH RETURN VALUE
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These functions return
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.B OK
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on success and
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.B ERR
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on failure.
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.PP
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In
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.IR \%ncurses ,
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they return
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.B ERR
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if
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.bP
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either of the window pointers are null,
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or
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.bP
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any part of the window would be placed off-screen.
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.SH NOTES
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.B \%overlay
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and
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.B \%overwrite
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may be implemented as macros.
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.SH PORTABILITY
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X/Open Curses Issue\ 4 describes these functions.
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It specifies no error conditions for them.
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It adds
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.I \%const
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qualifiers to the arguments.
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. \" TODO: migrate to HISTORY section
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It further specifies their behavior in the presence of characters
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with multibyte renditions (not yet supported in this implementation).
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.\" XXX: stale? ncurses is fine with multibyte characters now, no?
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.PP
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SVr4 describes a successful return value only as
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\*(``an integer value other than
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.IR ERR \*(''. \" Courier roman in source; SVID 4, vol. 3, p. 522
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.SH SEE ALSO
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\fB\%curses\fP(3X),
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\fB\%curs_pad\fP(3X),
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\fB\%curs_refresh\fP(3X)
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