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  34 <TITLE>curs_overlay 3x</TITLE>
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  39 <H1>curs_overlay 3x</H1>
  40 <HR>
  41 <PRE>
  42 <!-- Manpage converted by man2html 3.0.1 -->
  43 <STRONG><A HREF="curs_overlay.3x.html">curs_overlay(3x)</A></STRONG>                                       <STRONG><A HREF="curs_overlay.3x.html">curs_overlay(3x)</A></STRONG>
  44
  45
  46
  47
  48 </PRE>
  49 <H2>NAME</H2><PRE>
  50        <STRONG>overlay</STRONG>, <STRONG>overwrite</STRONG>, <STRONG>copywin</STRONG> - overlay and manipulate
  51        overlapped <STRONG>curses</STRONG> windows
  52
  53
  54 </PRE>
  55 <H2>SYNOPSIS</H2><PRE>
  56        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
  57
  58        <STRONG>int</STRONG> <STRONG>overlay(const</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*srcwin,</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*dstwin);</STRONG>
  59        <STRONG>int</STRONG> <STRONG>overwrite(const</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*srcwin,</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*dstwin);</STRONG>
  60        <STRONG>int</STRONG> <STRONG>copywin(const</STRONG>  <STRONG>WINDOW</STRONG>  <STRONG>*srcwin,</STRONG>  <STRONG>WINDOW</STRONG>  <STRONG>*dstwin,</STRONG>  <STRONG>int</STRONG>
  61        <STRONG>sminrow,</STRONG>
  62              <STRONG>int</STRONG> <STRONG>smincol,</STRONG> <STRONG>int</STRONG> <STRONG>dminrow,</STRONG> <STRONG>int</STRONG> <STRONG>dmincol,</STRONG> <STRONG>int</STRONG> <STRONG>dmaxrow,</STRONG>
  63              <STRONG>int</STRONG> <STRONG>dmaxcol,</STRONG> <STRONG>int</STRONG> <STRONG>overlay);</STRONG>
  64
  65
  66 </PRE>
  67 <H2>DESCRIPTION</H2><PRE>
  68        The  <STRONG>overlay</STRONG>  and <STRONG>overwrite</STRONG> routines overlay <EM>srcwin</EM> on top
  69        of <EM>dstwin</EM>.  <EM>scrwin</EM> and <EM>dstwin</EM> are not required to  be  the
  70        same  size;  only  text  where  the two windows overlap is
  71        copied.  The difference is that <STRONG>overlay</STRONG> is non-destructive
  72        (blanks  are not copied) whereas <STRONG>overwrite</STRONG> is destructive.
  73
  74        The <STRONG>copywin</STRONG> routine provides a finer granularity  of  con-
  75        trol over the <STRONG>overlay</STRONG> and <STRONG>overwrite</STRONG> routines.  Like in the
  76        <STRONG>prefresh</STRONG> routine, a rectangle is specified in the destina-
  77        tion  window,  (<EM>dminrow</EM>,  <EM>dmincol</EM>) and (<EM>dmaxrow</EM>, <EM>dmaxcol</EM>),
  78        and the upper-left-corner coordinates of the  source  win-
  79        dow, (<EM>sminrow</EM>, <EM>smincol</EM>).  If the argument <EM>overlay</EM> is <STRONG>true</STRONG>,
  80        then copying is non-destructive, as in <STRONG>overlay</STRONG>.
  81
  82
  83 </PRE>
  84 <H2>RETURN VALUE</H2><PRE>
  85        Routines that return an integer return <STRONG>ERR</STRONG>  upon  failure,
  86        and  <STRONG>OK</STRONG>  (SVr4 only specifies "an integer value other than
  87        <STRONG>ERR</STRONG>") upon successful completion.
  88
  89        X/Open defines no error conditions.  In  this  implementa-
  90        tion,  <STRONG>copywin</STRONG>,  <STRONG>overlay</STRONG>  and <STRONG>overwrite</STRONG> return an error if
  91        either of the window pointers are null, or if some part of
  92        the window would be placed off-screen.
  93
  94
  95 </PRE>
  96 <H2>NOTES</H2><PRE>
  97        Note that <STRONG>overlay</STRONG> and <STRONG>overwrite</STRONG> may be macros.
  98
  99
 100 </PRE>
 101 <H2>PORTABILITY</H2><PRE>
 102        The XSI Curses standard, Issue 4 describes these functions
 103        (adding the const qualifiers).  It further specifies their
 104        behavior in the presence of characters with multibyte ren-
 105        ditions (not yet supported in this implementation).
 106
 107
 108 </PRE>
 109 <H2>SEE ALSO</H2><PRE>
 110        <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_pad.3x.html">curs_pad(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>
 111
 112
 113
 114                                                        <STRONG><A HREF="curs_overlay.3x.html">curs_overlay(3x)</A></STRONG>
 115 </PRE>
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