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Revised the "PDCurses Text Attributes" comment section for consistency

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and completeness.
This commit is contained in:
William McBrine
2005-11-30 18:13:38 +00:00
parent 95dbcefa14
commit a392bf38f4
1 changed files with 30 additions and 8 deletions
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38
curses.h
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@@ -18,7 +18,7 @@
***************************************************************************
*/
/*
$Id: curses.h,v 1.40 2005/11/29 08:35:30 wmcbrine Exp $
$Id: curses.h,v 1.41 2005/11/30 18:13:38 wmcbrine Exp $
*/
/*
*----------------------------------------------------------------------
@@ -1111,21 +1111,43 @@ extern ACTIVE* CurWins; /* Currently Visible Windows */
PDCurses Text Attributes:
To include colour in PDCurses, a number of things had to be sacrificed
from the strict Unix and System V support.
The main problem is fitting all character attributes and colour into
an unsigned char (all 8 bits!). On System V, chtype is a long on
PDCurses it is a short int.
Originally, PDCurses used a short (16 bits) for its chtype. To include
colour, a number of things had to be sacrificed from the strict Unix and
System V support. The main problem was fitting all character attributes
and colour into an unsigned char (all 8 bits!).
Today, PDCurses by default uses a long (32 bits) for its chtype, as in
System V. The short chtype is still available (for use with 16-bit
compilers only -- don't try it in 32-bit mode!), by undefining
CHTYPE_LONG.
The following is the structure of a win->_attrs chtype:
short form:
-------------------------------------------------
|15|14|13|12|11|10| 9| 8| 7| 6| 5| 4| 3| 2| 1| 0|
-------------------------------------------------
colour number | attrs | character eg 'a'
The available attribute enhancers are bold, reverse and blink. All other
Unix attributes have no effect. The high order char is an index into an
array of physical colours (defined in INITPAIR.c). 32 (5 bits)
foreground/background colour combinations combined with 8 (3 bits)
attribute modifiers are available.
long form:
-------------------------------------------------------------------------------------------------
|31|30|29|28|27|26|25|24|23|22|21|20|19|18|17|16|15|14|13|12|11|10| 9| 8| 7| 6| 5| 4| 3| 2| 1| 0|
-------------------------------------------------------------------------------------------------
colour number | modifiers | character eg 'a' (potential for DBCS)
The available attribute modifiers are bold, underline, invisible, protect, reverse
and blink.
The available attribute modifiers are bold, underline, invisible,
protect, reverse and blink. 256 (8 bits) colour pairs, 8 bits for
modifiers, and 16 bits for character data. (In practice, only 64 colour
pairs are available, and only the lower 8 bits of character data are
currently used.)
**man-end**********************************************************************/