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</PRE><H3><a name="h3-Legacy-window-attributes">Legacy window attributes</a></H3><PRE>
- Most of the window attribute routines are extensions of older routines
- which assume that color pairs are OR'd into the attribute parameter.
- These older routines use the same name, omitting an underscore (<STRONG>_</STRONG>).
+ The X/Open window attribute routines which <EM>set</EM> or <EM>get</EM>, turn <EM>on</EM> or <EM>off</EM>
+ are extensions of older routines which assume that color pairs are OR'd
+ into the attribute parameter. These newer routines use similar names,
+ because X/Open simply added an underscore (<STRONG>_</STRONG>) for the newer names.
+
+ The <STRONG>int</STRONG> datatype used in the legacy routines is treated as if it is the
+ same size as <STRONG>chtype</STRONG> (used by <STRONG><A HREF="curs_addch.3x.html">addch(3x)</A></STRONG>). It holds the common video at-
+ tributes (such as bold, reverse), as well as a few bits for color.
+ Those bits correspond to the <STRONG>A_COLOR</STRONG> symbol. The <STRONG>COLOR_PAIR</STRONG> macro pro-
+ vides a value which can be OR'd into the attribute parameter. For ex-
+ ample, as long as that value fits into the <STRONG>A_COLOR</STRONG> mask, then these
+ calls produce similar results:
+
+ attrset(A_BOLD | COLOR_PAIR(<EM>pair</EM>));
+ attr_set(A_BOLD, <EM>pair</EM>, NULL);
+
+ However, if the value does not fit, then the <STRONG>COLOR_PAIR</STRONG> macro uses only
+ the bits that fit. For example, because in ncurses <STRONG>A_COLOR</STRONG> has eight
+ (8) bits, then <STRONG>COLOR_PAIR(</STRONG><EM>259</EM><STRONG>)</STRONG> is 4 (i.e., 259 is 4 more than the limit
+ 255).
+
+ The <STRONG>PAIR_NUMBER</STRONG> macro extracts a pair number from an <STRONG>int</STRONG> (or <STRONG>chtype</STRONG>).
+ For example, the <EM>input</EM> and <EM>output</EM> values in these statements would be
+ the same:
+
+ int value = A_BOLD | COLOR_PAIR(<EM>input</EM>);
+ int <EM>output</EM> = PAIR_NUMBER(value);
The <STRONG>attrset</STRONG> routine is a legacy feature predating SVr4 curses but kept
in X/Open Curses for the same reason that SVr4 curses kept it: compati-
passed to <STRONG>addch</STRONG> (see <STRONG><A HREF="curs_addch.3x.html">curs_addch(3x)</A></STRONG>).
<EM>Name</EM> <EM>Description</EM>
- -----------------------------------------------------------
+ -----------------------------------------------------------------
<STRONG>A_NORMAL</STRONG> Normal display (no highlight)
<STRONG>A_STANDOUT</STRONG> Best highlighting mode of the terminal.
<STRONG>A_UNDERLINE</STRONG> Underlining
<STRONG>A_ALTCHARSET</STRONG> Alternate character set
<STRONG>A_ITALIC</STRONG> Italics (non-X/Open extension)
<STRONG>A_CHARTEXT</STRONG> Bit-mask to extract a character
+ <STRONG>A_COLOR</STRONG> Bit-mask to extract a color (legacy routines)
These video attributes are supported by <STRONG>attr_on</STRONG> and related functions
(which also support the attributes recognized by <STRONG>attron</STRONG>, etc.):
1995 Solaris 5.4 32/64 7 16 X/Open curses
1996 AIX 4.2 32 7 16 X/Open curses
1996 OSF/1 r4 32 6 16 X/Open curses
+
1997 HP-UX 11.00 32 6 8 X/Open curses
2000 U/Win 32/64 7/31 16 uses <STRONG>chtype</STRONG>
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