{
  System independent low-level video interface for os/2

  $Id$
}

uses    viocalls;

var videobuf:Pvideobuf;
    videobufsize:cardinal;
    lastcursortype:word=crunderline;
    cell_width,cell_height:word;

{$ASMMODE ATT}

procedure update_cell_size;

begin
    {This function cannot fail when you the default handle is used.}
    viogetdevicecellsize(cell_height,cell_width,0);
end;

procedure initvideo;

begin
    initvideocalled:=true;
    {Get the address of the videobuffer.}
    if viogetbuf(videobuf,videobufsize,0)=0 then
        begin
            update_cell_size;
            sethighbitblink;
            setcursortype(lastcursortype);
        end
    else
        errcode:=errvioinit;
end;

procedure setcursorpos(newcursorx,newcursory:word);

begin
    if viosetcurpos(newcursory,newcursorx,0)<>0 then
        {Do not set an error code; people should fix invalid newcursorx or
         newcursory values when designing, there is no need for detecting
         these errors at runtime.}
        runerror(225);
end;

function getcursortype:word;

var cd:Tviocursorinfo;

begin
    viogetcurtype(cd,0);    {Never fails, because handle is default handle.}
    if cd.attr=-1 then
        getcursortype:=crhidden
    else
        {Because the cursor's start and end lines are returned, we'll have
         to guess heuristically what cursor type we have.}
        case cd.cend-cd.ystart of
            0:
                {Propably this does not occur, but you'll never know.}
                getcursortype:=crhidden;
            1..cell_height div 4:
                getcursortype=crunderline;
            cell_height div 4..cell_height div 2:
                getcursortype:=crhalfblock;
            else
                getcursortype:=crblock;
        end;
end;

procedure setcursortype;

begin
end;

procedure donevideo;

begin
    If initvideocalled then
        begin
            lastcursortype:=getcursortype;
            clearscreen;
            setcursortype(crunderline);
            setcursorpos(0,0);
            initvideocalled:=false;
            videobufsize:=0;
        end;
end;


function GetCapabilities: Word;

begin
  GetCapabilities := $3F;
end;


procedure SetCursorPos(NewCursorX, NewCursorY: Word);

begin
end;


function GetCursorType: Word;

begin
end;


procedure SetCursorType(NewType: Word);

begin
end;


function DefaultVideoModeSelector(const VideoMode: TVideoMode; Params: Longint): Boolean;

begin
end;


procedure ClearScreen;

begin
end;


procedure UpdateScreen(Force: Boolean);
begin
  if LockUpdateScreen<>0 then
   exit;
  if not force then
   begin
	 asm
		movl    VideoBuf,%esi
		movl    OldVideoBuf,%edi
		movl    VideoBufSize,%ecx
		shrl    $2,%ecx
		repe
		cmpsl
		orl     %ecx,%ecx
		jz      .Lno_update
		movb    $1,force
.Lno_update:
	 end;
   end;
  if Force then
   begin
	 dosmemput(videoseg,0,videobuf^,VideoBufSize);
	 move(videobuf^,oldvideobuf^,VideoBufSize);
   end;
end;


procedure RegisterVideoModes;
begin
  RegisterVideoMode(40, 25, False, DefaultVideoModeSelector, $00000000);
  RegisterVideoMode(40, 25, True, DefaultVideoModeSelector, $00000001);
  RegisterVideoMode(80, 25, False, DefaultVideoModeSelector, $00000002);
  RegisterVideoMode(80, 25, True, DefaultVideoModeSelector, $00000003);
end;

{
  $Log$
  Revision 1.1  2000-02-23 22:44:22  daniel
  * Video.inc for os/2

  Revision 1.4  1998/12/15 17:17:17  peter
    + cursor at 1,1 at the end

  Revision 1.3  1998/12/12 19:13:01  peter
    * keyboard updates
    * make test target, make all only makes units

  Revision 1.2  1998/12/10 11:41:50  florian
    * cursor is properly restored in DoneVideo

  Revision 1.1  1998/12/04 12:48:27  peter
    * moved some dirs

  Revision 1.4  1998/11/01 20:29:11  peter
    + lockupdatescreen counter to not let updatescreen() update

  Revision 1.3  1998/10/28 21:18:26  peter
    * more fixes

  Revision 1.2  1998/10/28 00:02:08  peter
    + mouse
    + video.clearscreen, video.videobufsize

  Revision 1.1  1998/10/26 11:31:47  peter
    + inital include files

}