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* bugfix report 2068

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carl 2002-09-08 15:02:58 +00:00
parent d20dd2b433
commit 0f6f7f44c8
1 changed files with 10 additions and 9 deletions
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19
docs/video.tex
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@ -146,11 +146,11 @@ errVioNoSuchMode = errVioBase + 3; { No such video mode }
The following constants can be read to get some information about the
current screen:
\begin{verbatim}
ScreenWidth : Word = 0;
ScreenHeight : Word = 0;
ScreenWidth : Word = 0; { Width of the screen, in characters }
ScreenHeight : Word = 0; { Height of the screen, in characters }
LowAscii : Boolean = true;
NoExtendedFrame : Boolean = false;
FVMaxWidth = 132;
FVMaxWidth = 132;
\end{verbatim}
The error-handling code uses the following constants:
\begin{verbatim}
@ -174,9 +174,12 @@ supports colors, or \var{False} if not.
Color : Boolean;
end;
\end{verbatim}
\var{TVideoCell} describes one character on the screen. The high byte
\var{TVideoCell} describes one character on the screen. One of the bytes
contains the color attribute with which the character is drawn on the screen,
and the low byte contains the ASCII code of the character to be drawn.
and the other byte contains the ASCII code of the character to be drawn. The
exact position of the different bytes in the record is operating system specific.
On most little-endian systems, the high byte represents the color attribute,
while the low-byte represents the ASCII code of the character to be drawn.
\begin{verbatim}
TVideoCell = Word;
PVideoCell = ^TVideoCell;
@ -234,12 +237,10 @@ CursorX, CursorY : Word;
\var{ScreenColor} indicates whether the current screen supports colors.
\var{CursorX,CursorY} contain the current cursor position.
The following variables form the heart of the \file{Video} unit: The
The following variable forms the heart of the \file{Video} unit: The
\var{VideoBuf} array represents the physical screen. Writing to this
array and calling \seep{UpdateScreen} will write the actual characters
to the screen. \var{VideoBufSize} contains the actual screen size, and is
equal to the product of the number of columns times the number of lines
on the screen (\var{ScreenWidth*ScreenHeight}).
to the screen.
\begin{verbatim}
VideoBuf : PVideoBuf;
OldVideoBuf : PVideoBuf;