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{
This file is part of the Free Pascal run time library.
Copyright (c) 1999-2000 by Florian Klaempfl
member of the Free Pascal development team
Video unit for OS/2
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
unit Video;
interface
{$i videoh.inc}
implementation
uses
DosCalls, VioCalls, Mouse, graphemebreakproperty, eastasianwidth, charset;
{$i video.inc}
const
LastCursorType: word = crUnderline;
EmptyCell: cardinal = $0720;
OrigScreen: PVideoBuf = nil;
OrigScreenSize: cardinal = 0;
var OrigCurType: TVioCursorInfo;
OrigVioMode: TVioModeInfo;
OrigHighBit: TVioIntensity;
OrigCurRow: word;
OrigCurCol: word;
CellHeight: byte;
procedure CheckCellHeight;
var OldCD, CD: TVioCursorInfo;
begin
VioGetCurType (OldCD, 0);
Move (OldCD, CD, SizeOf (CD));
with CD do
begin
Attr := 0;
yStart := word (-90);
cEnd := word (-100);
end;
VioSetCurType (CD, 0);
VioGetCurType (CD, 0);
CellHeight := CD.cEnd;
VioSetCurType (OldCD, 0);
end;
procedure SetHighBitBlink (Blink: boolean);
var VI: TVioIntensity;
begin
with VI do
begin
cb := 6;
rType := 2;
fs := byte (not (Blink));
end;
VioSetState (VI, 0);
end;
Var
SysVideoBuf : PVideoBuf;
procedure SysInitVideo;
var
MI: TVioModeInfo;
NewBuf: PVideoBuf;
begin
MI.cb := SizeOf (MI);
VioGetMode (MI, 0);
with MI do
begin
ScreenWidth := Col;
ScreenHeight := Row;
ScreenColor := Color >= Colors_16;
end;
VioGetCurPos (CursorY, CursorX, 0);
SetCursorType (LastCursorType);
{ Get the address of the videobuffer.}
if VioGetBuf (NewBuf, PWord (@VideoBufSize)^, 0) = 0 then
begin
SysVideoBuf := SelToFlat (PtrUInt (NewBuf));
SetHighBitBlink (true);
end
else
ErrorHandler (errVioInit, nil);
end;
procedure SysSetCursorPos (NewCursorX, NewCursorY: word);
begin
if VioSetCurPos (NewCursorY, NewCursorX, 0) = 0 then
begin
CursorX := NewCursorX;
CursorY := NewCursorY;
end
{ else
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 SysGetCursorType: word;
var CD: TVioCursorInfo;
begin
VioGetCurType (CD, 0); {Never fails, because handle is default handle.}
with CD do
begin
CursorLines := Succ (cEnd) - yStart;
if Attr = word (-1) then
SysGetCursorType := crHidden
else
{Because the cursor's start and end lines are returned, we'll have
to guess heuristically what cursor type we have.}
if CursorLines = 0 then
{Probably this does not occur, but you'll never know.}
SysGetCursorType := crHidden
else if CursorLines <= Succ (CellHeight div 4) then
SysGetCursorType := crUnderline
else if CursorLines <= Succ (CellHeight div 2) then
SysGetCursorType := crHalfBlock
else
SysGetCursorType := crBlock;
end;
end;
procedure SysSetCursorType (NewType: word);
var CD: TVioCursorInfo;
begin
VioGetCurType (CD, 0);
with CD do
begin
case NewType of
crHidden: Attr := word (-1);
crUnderline:
begin
Attr := 0;
yStart := word (-90);
cEnd := word (-100);
end;
crHalfBlock:
begin
Attr := 0;
yStart := word (-50);
cEnd := word (-100);
end;
crBlock:
begin
Attr := 0;
yStart := 0;
cEnd := word (-100);
end;
end;
VioSetCurType (CD, 0);
VioGetCurType (CD, 0);
CursorLines := Succ (cEnd) - yStart;
end;
end;
procedure SysClearScreen;
begin
VioScrollDn (0, 0, word (-1), word (-1), word (-1), PWord (@EmptyCell)^, 0);
FillWord (SysVideoBuf^, VideoBufSize shr 1, PWord (@EmptyCell)^);
end;
procedure SysDoneVideo;
var PScr: pointer;
ScrSize: cardinal;
begin
LastCursorType := GetCursorType;
SysClearScreen;
{Restore original settings}
VioSetMode (OrigVioMode, 0);
CheckCellHeight;
{Set CursorX and CursorY}
SetCursorPos (0, 0);
VioSetState (OrigHighBit, 0);
VioSetCurType (OrigCurType, 0);
VioSetCurPos (OrigCurRow, OrigCurCol, 0);
if (OrigScreenSize <> 0) and (OrigScreen <> nil) then
begin
ScrSize := 0;
if (VioGetBuf (PScr, PWord (@ScrSize)^, 0) = 0) and
(ScrSize = OrigScreenSize) then
begin
PScr := SelToFlat (PtrUInt (PScr));
Move (OrigScreen^, PScr^, OrigScreenSize);
VioShowBuf (0, ScrSize, 0);
end;
end;
end;
function SysGetCapabilities: word;
begin
SysGetCapabilities := $3F;
end;
function SysVideoModeSelector (const VideoMode: TVideoMode): boolean;
var
OldMI, MI: TVioModeInfo;
NewBuf: PVideoBuf;
begin
OldMI.cb := SizeOf (OldMI);
if VioGetMode (OldMI, 0) <> 0 then
SysVideoModeSelector := false
else
begin
with MI do
begin
cb := 8;
fbType := 1;
if VideoMode.Color then
Color := Colors_16
else
Color := Colors_2;
Col := VideoMode.Col;
Row := VideoMode.Row;
end;
if VioSetMode (MI, 0) = 0 then
if VioGetBuf (NewBuf, PWord (@VideoBufSize)^, 0) = 0 then
begin
SysVideoBuf := SelToFlat (PtrUInt (NewBuf));
SysVideoModeSelector := true;
SetHighBitBlink (true);
CheckCellHeight;
SetCursorType (LastCursorType);
SysClearScreen;
end
else
begin
SysVideoModeSelector := false;
VioSetMode (OldMI, 0);
if (VioGetBuf (NewBuf, PWord (@VideoBufSize)^, 0) = 0) then
SysVideoBuf := SelToFlat (PtrUInt (NewBuf));
SetHighBitBlink (true);
CheckCellHeight;
SetCursorType (LastCursorType);
SysClearScreen;
end
else
begin
SysVideoModeSelector := false;
if VioGetBuf (NewBuf, PWord (@VideoBufSize)^, 0) = 0 then
SysVideoBuf := SelToFlat (PtrUInt (NewBuf));
SetHighBitBlink (true);
SetCursorType (LastCursorType);
end;
end;
end;
Const
SysVideoModeCount = 6;
SysVMD : Array[0..SysVideoModeCount-1] of TVideoMode = (
(Col: 40; Row: 25; Color: True),
(Col: 80; Row: 25; Color: True),
(Col: 80; Row: 30; Color: True),
(Col: 80; Row: 43; Color: True),
(Col: 80; Row: 50; Color: True),
(Col: 80; Row: 25; Color: True) // Reserved for TargetEntry
);
{ .MVC. were commented:
BW modes are rejected on my (colour) configuration. I can't imagine
OS/2 running on MCGA anyway... ;-)
(Col: 40; Row: 25;Color: False),
(Col: 80; Row: 25;Color: False),
The following modes wouldn't work on plain VGA; is it useful to check
for their availability on the program startup?
(Col: 132;Row: 25;Color: True),
(Col: 132;Row: 30;Color: True),
(Col: 132;Row: 43;Color: True),
(Col: 132;Row: 50;Color: True),
}
Function SysSetVideoMode (Const Mode : TVideoMode) : Boolean;
Var
I : Integer;
begin
I:=SysVideoModeCount-1;
SysSetVideoMode:=False;
While (I>=0) and Not SysSetVideoMode do
If (Mode.col=SysVMD[i].col) and
(Mode.Row=SysVMD[i].Row) and
(Mode.Color=SysVMD[i].Color) then
SysSetVideoMode:=True
else
Dec(I);
If SysSetVideoMode then
begin
if SysVideoModeSelector(Mode) then
begin;
ScreenWidth:=SysVMD[I].Col;
ScreenHeight:=SysVMD[I].Row;
ScreenColor:=SysVMD[I].Color;
end else SysSetVideoMode := false;
end;
end;
Function SysGetVideoModeData (Index : Word; Var Data : TVideoMode) : boolean;
begin
SysGetVideoModeData:=(Index<=SysVideoModeCount);
If SysGetVideoModeData then
Data:=SysVMD[Index];
end;
Function SysGetVideoModeCount : Word;
begin
SysGetVideoModeCount:=SysVideoModeCount;
end;
{$ASMMODE INTEL}
procedure SysUpdateScreen (Force: boolean);
var SOfs, CLen: cardinal;
Mouse_Visible: boolean;
begin
if not (Force) then
asm
push ebx
push esi
push edi
cld
mov esi, VideoBuf
mov edi, OldVideoBuf
mov eax, VideoBufSize
mov ecx, eax
shr ecx, 1
shr ecx, 1
repe
cmpsd
je @no_update
inc ecx
mov edx, eax
mov ebx, ecx
shl ebx, 1
shl ebx, 1
sub edx, ebx
mov SOfs, edx
mov Force, 1
std
mov edi, eax
mov esi, VideoBuf
add eax, esi
sub eax, 4
mov esi, eax
mov eax, OldVideoBuf
add eax, edi
sub eax, 4
mov edi, eax
repe
cmpsd
inc ecx
shl ecx, 1
shl ecx, 1
mov CLen, ecx
cld
@no_update:
pop edi
pop esi
pop ebx
end ['eax', 'ecx', 'edx']
else
begin
SOfs := 0;
CLen := VideoBufSize;
end;
// .MVC. Move video buffer to system video buffer.
{$HINT Change so that only relevant parts calculated above are moved}
Move(VideoBuf^,SysVideoBuf^,VideoBufSize);
if Force then
begin
Mouse_Visible := MouseIsVisible; {MouseIsVisible is from Mouse unit}
if Mouse_Visible then
HideMouse;
VioShowBuf (SOfs, CLen, 0);
Move (VideoBuf^ [SOfs div SizeOf (TVideoCell)],
OldVideoBuf^ [SOfs div SizeOf (TVideoCell)], CLen);
if Mouse_Visible then
ShowMouse;
end;
end;
Const
SysVideoDriver : TVideoDriver = (
InitDriver : @SysInitVideo;
InitEnhancedDriver : nil;
DoneDriver : @SysDoneVideo;
UpdateScreen : @SysUpdateScreen;
ClearScreen : @SysClearScreen;
SetVideoMode : @SysSetVideoMode;
GetVideoModeCount : @SysGetVideoModeCount;
GetVideoModeData : @SysGetVideoModedata;
SetCursorPos : @SysSetCursorPos;
GetCursorType : @SysGetCursorType;
SetCursorType : @SysSetCursorType;
GetCapabilities : @SysGetCapabilities;
GetActiveCodePage : nil;
ActivateCodePage : nil;
GetSupportedCodePageCount : nil;
GetSupportedCodePage : nil;
);
procedure TargetEntry;
var
PScr: pointer;
begin
{Remember original video mode, cursor type and high bit behaviour setting}
OrigVioMode.cb := SizeOf (OrigVioMode);
VioGetMode (OrigVioMode, 0);
with OrigVioMode do
begin
ScreenWidth := Col;
ScreenHeight := Row;
ScreenColor := Color >= Colors_16;
end;
VioGetCurType (OrigCurType, 0);
VioGetCurPos (OrigCurRow, OrigCurCol, 0);
with OrigHighBit do
begin
cb := 6;
rType := 2;
end;
VioGetState (OrigHighBit, 0);
{ Register the curent video mode in reserved slot in System Modes}
with OrigVioMode do
begin
{Assume we have at least 16 colours available in "colour" modes}
SysVMD[SysVideoModeCount-1].Col:=Col;
SysVMD[SysVideoModeCount-1].Row:=Row;
SysVMD[SysVideoModeCount-1].Color:=(Color >= Colors_16);
end;
{Get the address of the original videobuffer and size.}
if VioGetBuf (PScr, PWord (@OrigScreenSize)^, 0) = 0 then
begin
PScr := SelToFlat (PtrUInt (PScr));
GetMem (OrigScreen, OrigScreenSize);
Move (PScr^, OrigScreen^, OrigScreenSize);
end;
end;
initialization
begin
SetVideoDriver(SysVideoDriver);
TargetEntry;
end;
finalization
if (OrigScreenSize <> 0) and (OrigScreen <> nil) then
begin
FreeMem (OrigScreen, OrigScreenSize);
OrigScreen := nil;
OrigScreenSize := 0;
end;
end.
|