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WinComm/delphi/KPANSI.PAS
Scott Duensing cd55adae4f Fix cursor artifacts and WM_TIMER starvation during high-speed data 
Three fixes:

1. Cursor font mismatch: cursor overlay TextOut used the default DC
   font instead of FPaintFont (OEM_CHARSET). The wrong font size left
   residual pixels that buffer BitBlt didn't fully cover. Fix: select
   FPaintFont + OPAQUE BkMode into the CS_OWNDC screen DC once in
   RecalcCellSize, and re-assert before cursor TextOut in case VCL
   Paint altered the DC state.

2. WM_TIMER starvation: on Win16, WM_TIMER is lowest-priority and
   never dispatched while WM_COMMNOTIFY floods the queue. Fix: render
   from EndUpdate using GetTickCount throttle (no timer dependency).
   The timer remains as fallback for idle blink and trailing data.

3. Scroll performance: restore deferred ScrollDC at render time (not
   during parsing) so only newly-revealed rows need PaintLine instead
   of all 25. Dirty flags shift with each DoScrollUp to track the
   correct logical line positions after scroll.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-26 21:40:58 -06:00

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unit KPAnsi;
{ KPAnsi - ANSI BBS terminal emulation component for Delphi 1.0. }
{ }
{ TKPAnsi is a TCustomControl descendant providing a visual ANSI terminal }
{ display with scrollback buffer, cursor blinking, and ANSI music support. }
{ Renders incoming data using standard ANSI/VT100 escape sequences for }
{ cursor positioning, color attributes, and screen manipulation. }
{ }
{ Installs to the "KP" palette tab alongside TKPComm. }
interface
uses
SysUtils, Classes, WinTypes, WinProcs, Messages, Graphics, Controls, Forms;
type
TKeyDataEvent = procedure(Sender: TObject; const Data: string) of object;
TParseState = (psNormal, psEscape, psCSI, psCSIQuestion, psMusic);
TTermCell = record
Ch: Char;
FG: TColor;
BG: TColor;
Bold: Boolean;
Blink: Boolean;
end;
PTermLine = ^TTermLineRec;
TTermLineRec = record
Cells: array[0..255] of TTermCell;
end;
TKPAnsi = class(TCustomControl)
private
FScreen: TList;
FScrollback: TList;
FCursorRow: Integer;
FCursorCol: Integer;
FSaveCurRow: Integer;
FSaveCurCol: Integer;
FAttrFG: Integer;
FAttrBG: Integer;
FAttrBold: Boolean;
FAttrBlink: Boolean;
FAttrReverse: Boolean;
FParseState: TParseState;
FParamStr: string;
FMusicStr: string;
FCellWidth: Integer;
FCellHeight: Integer;
FBlinkOn: Boolean;
FTimerActive: Boolean;
FScrollPos: Integer;
FWrapMode: Boolean;
FCols: Integer;
FRows: Integer;
FScrollbackSize: Integer;
FCursorVisible: Boolean;
FOnKeyData: TKeyDataEvent;
FPaintFont: HFont;
FStockFont: Boolean;
FBlinkPhase: Integer;
FBlinkCount: Integer;
FUpdateCount: Integer;
FPendingScroll: Integer;
FLastRenderTick: Longint;
FDirtyRow: array[0..255] of Boolean;
FAllDirty: Boolean;
FBufDC: array[0..1] of HDC;
FBufBmp: array[0..1] of HBitmap;
FBufOldBmp: array[0..1] of HBitmap;
FBufW: Integer;
FBufH: Integer;
procedure AllocLine(Line: PTermLine);
procedure ClearBufRect(X, Y, W, H: Integer; BG: TColor);
procedure ClearLine(Line: PTermLine);
procedure CMFontChanged(var Msg: TMessage); message cm_FontChanged;
procedure CreateBuffers;
procedure CreatePaintFont;
procedure DeleteChars(N: Integer);
procedure DeleteLines(N: Integer);
procedure DestroyBuffers;
procedure DirtyAll;
procedure DirtyRow(Row: Integer);
procedure DoScrollDown;
procedure DoScrollUp;
procedure DrawRow(Row: Integer);
procedure EraseDisplay(Mode: Integer);
procedure EraseLine(Mode: Integer);
procedure ExecuteCSI(FinalCh: Char);
procedure ExecuteMusic;
procedure FlipToScreen;
procedure FreeLineList(List: TList);
function GetCursorCol: Integer;
function GetCursorRow: Integer;
procedure InsertChars(N: Integer);
procedure InsertLines(N: Integer);
procedure PaintLine(Line: PTermLine; PixelY: Integer);
procedure ParseData(const S: string);
procedure ParseSGR;
procedure ProcessChar(Ch: Char);
procedure RecalcCellSize;
procedure RedrawBuffers;
procedure ResizeScreen;
procedure SetCols(Value: Integer);
procedure SetCursorVisible(Value: Boolean);
procedure SetRows(Value: Integer);
procedure SetScrollbackSize(Value: Integer);
procedure TrimScrollback;
procedure UpdateScrollbar;
procedure WMEraseBkgnd(var Msg: TWMEraseBkgnd); message wm_EraseBkgnd;
procedure WMGetDlgCode(var Msg: TMessage); message wm_GetDlgCode;
procedure WMTimer(var Msg: TWMTimer); message wm_Timer;
procedure WMVScroll(var Msg: TWMScroll); message wm_VScroll;
protected
procedure CreateParams(var Params: TCreateParams); override;
procedure KeyDown(var Key: Word; Shift: TShiftState); override;
procedure KeyPress(var Key: Char); override;
procedure Paint; override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure BeginUpdate;
procedure Clear;
procedure EndUpdate;
procedure Reset;
procedure Write(const S: string);
property CursorCol: Integer read GetCursorCol;
property CursorRow: Integer read GetCursorRow;
published
property Cols: Integer read FCols write SetCols default 80;
property Rows: Integer read FRows write SetRows default 25;
property ScrollbackSize: Integer read FScrollbackSize
write SetScrollbackSize default 500;
property CursorVisible: Boolean read FCursorVisible
write SetCursorVisible default True;
property Font;
property Color default clBlack;
property OnKeyData: TKeyDataEvent read FOnKeyData write FOnKeyData;
property TabStop default True;
end;
procedure Register;
implementation
const
AnsiColors: array[0..15] of TColor = (
$00000000, { 0 Black }
$00000080, { 1 Red (low) -- BGR order }
$00008000, { 2 Green }
$00008080, { 3 Yellow/Brown }
$00800000, { 4 Blue }
$00800080, { 5 Magenta }
$00808000, { 6 Cyan }
$00C0C0C0, { 7 White (low) }
$00808080, { 8 Dark Gray }
$000000FF, { 9 Red (bright) }
$0000FF00, { 10 Green (bright) }
$0000FFFF, { 11 Yellow (bright) }
$00FF0000, { 12 Blue (bright) }
$00FF00FF, { 13 Magenta (bright) }
$00FFFF00, { 14 Cyan (bright) }
$00FFFFFF { 15 White (bright) }
);
{ Timer fires at ~18 Hz (Win16 tick resolution is ~55 ms). }
{ Cursor and text blink toggle every 9 ticks (~500 ms). }
RenderTickMs = 55;
BlinkInterval = 9;
{ OUT_RASTER_PRECIS may not be defined in Delphi 1.0 WinTypes }
OutRasterPrecis = 6;
{ ANSI music note frequencies (octave 0, multiply by 2^octave) }
{ C, C#, D, D#, E, F, F#, G, G#, A, A#, B }
BaseNoteFreq: array[0..11] of Word = (
262, 277, 294, 311, 330, 349, 370, 392, 415, 440, 466, 494
);
{ ----------------------------------------------------------------------- }
{ Helper: parse semicolon-delimited parameter string into integer array }
{ ----------------------------------------------------------------------- }
procedure ParseParams(const S: string; var Params: array of Integer;
var Count: Integer);
var
I: Integer;
Start: Integer;
Token: string;
begin
Count := 0;
if Length(S) = 0 then
Exit;
Start := 1;
for I := 1 to Length(S) do
begin
if S[I] = ';' then
begin
if Count <= High(Params) then
begin
Token := Copy(S, Start, I - Start);
if Length(Token) > 0 then
Params[Count] := StrToIntDef(Token, 0)
else
Params[Count] := 0;
Inc(Count);
end;
Start := I + 1;
end;
end;
{ Last token after final semicolon (or entire string if no semicolons) }
if Count <= High(Params) then
begin
Token := Copy(S, Start, Length(S) - Start + 1);
if Length(Token) > 0 then
Params[Count] := StrToIntDef(Token, 0)
else
Params[Count] := 0;
Inc(Count);
end;
end;
{ ----------------------------------------------------------------------- }
{ TKPAnsi }
{ ----------------------------------------------------------------------- }
procedure TKPAnsi.AllocLine(Line: PTermLine);
var
I: Integer;
begin
for I := 0 to FCols - 1 do
begin
Line^.Cells[I].Ch := ' ';
Line^.Cells[I].FG := AnsiColors[7];
Line^.Cells[I].BG := AnsiColors[0];
Line^.Cells[I].Bold := False;
Line^.Cells[I].Blink := False;
end;
end;
procedure TKPAnsi.BeginUpdate;
begin
Inc(FUpdateCount);
end;
procedure TKPAnsi.Clear;
var
I: Integer;
Line: PTermLine;
begin
{ Move current screen lines to scrollback }
for I := 0 to FScreen.Count - 1 do
begin
FScrollback.Add(FScreen[I]);
end;
FScreen.Clear;
TrimScrollback;
{ Allocate fresh screen lines }
for I := 0 to FRows - 1 do
begin
GetMem(Line, SizeOf(TTermLineRec));
AllocLine(Line);
FScreen.Add(Line);
end;
FCursorRow := 0;
FCursorCol := 0;
FScrollPos := 0;
UpdateScrollbar;
FAllDirty := True;
Invalidate;
end;
procedure TKPAnsi.ClearLine(Line: PTermLine);
var
I: Integer;
begin
for I := 0 to FCols - 1 do
begin
Line^.Cells[I].Ch := ' ';
Line^.Cells[I].FG := AnsiColors[7];
Line^.Cells[I].BG := AnsiColors[0];
Line^.Cells[I].Bold := False;
Line^.Cells[I].Blink := False;
end;
end;
procedure TKPAnsi.CMFontChanged(var Msg: TMessage);
begin
inherited;
RecalcCellSize;
end;
constructor TKPAnsi.Create(AOwner: TComponent);
var
I: Integer;
Line: PTermLine;
begin
inherited Create(AOwner);
Width := 640;
Height := 400;
Color := clBlack;
TabStop := True;
FCols := 80;
FRows := 25;
FScrollbackSize := 500;
FCursorVisible := True;
FScreen := TList.Create;
FScrollback := TList.Create;
FCursorRow := 0;
FCursorCol := 0;
FSaveCurRow := 0;
FSaveCurCol := 0;
FAttrFG := 7;
FAttrBG := 0;
FAttrBold := False;
FAttrBlink := False;
FAttrReverse := False;
FParseState := psNormal;
FParamStr := '';
FMusicStr := '';
FCellWidth := 8;
FCellHeight := 16;
FBlinkOn := True;
FTimerActive := False;
FScrollPos := 0;
FWrapMode := True;
FPaintFont := 0;
FStockFont := False;
FBlinkPhase := 0;
FBlinkCount := 0;
FUpdateCount := 0;
FPendingScroll := 0;
FLastRenderTick := 0;
FAllDirty := True;
FBufDC[0] := 0;
FBufDC[1] := 0;
FBufBmp[0] := 0;
FBufBmp[1] := 0;
FBufW := 0;
FBufH := 0;
{ Set a monospace font -- OEM charset selected in CreatePaintFont }
Font.Name := 'Terminal';
Font.Size := 9;
Font.Pitch := fpFixed;
{ Allocate initial screen lines }
for I := 0 to FRows - 1 do
begin
GetMem(Line, SizeOf(TTermLineRec));
AllocLine(Line);
FScreen.Add(Line);
end;
end;
procedure TKPAnsi.CreatePaintFont;
var
LF: TLogFont;
ActualLF: TLogFont;
NewFont: HFont;
begin
{ Free previous font (stock fonts must not be deleted) }
if (FPaintFont <> 0) and not FStockFont then
DeleteObject(FPaintFont);
FPaintFont := 0;
FStockFont := False;
{ Build LOGFONT requesting OEM_CHARSET with raster precision for CP437 }
{ box-drawing, block elements, and other BBS ANSI art glyphs. Raster }
{ precision prevents the font mapper from substituting a TrueType font }
{ that might remap character codes through Unicode tables. }
FillChar(LF, SizeOf(LF), 0);
LF.lfHeight := Font.Height;
LF.lfPitchAndFamily := FIXED_PITCH or FF_MODERN;
LF.lfCharSet := OEM_CHARSET;
LF.lfOutPrecision := OutRasterPrecis;
if fsBold in Font.Style then
LF.lfWeight := FW_BOLD
else
LF.lfWeight := FW_NORMAL;
StrPCopy(LF.lfFaceName, Font.Name);
NewFont := CreateFontIndirect(LF);
if NewFont <> 0 then
begin
{ Verify Windows actually gave us an OEM charset font }
GetObject(NewFont, SizeOf(ActualLF), @ActualLF);
if ActualLF.lfCharSet = OEM_CHARSET then
FPaintFont := NewFont
else
DeleteObject(NewFont);
end;
if FPaintFont = 0 then
begin
FPaintFont := GetStockObject(OEM_FIXED_FONT);
FStockFont := True;
end;
{ Select font into both buffer DCs }
if FPaintFont <> 0 then
begin
if FBufDC[0] <> 0 then
SelectObject(FBufDC[0], FPaintFont);
if FBufDC[1] <> 0 then
SelectObject(FBufDC[1], FPaintFont);
end;
end;
procedure TKPAnsi.CreateParams(var Params: TCreateParams);
begin
inherited CreateParams(Params);
Params.Style := Params.Style or ws_VScroll;
{ CS_OWNDC gives us a private DC whose state (selected font, BkMode, }
{ colors) persists across GetDC/ReleaseDC calls. This eliminates the }
{ per-frame cost of SelectObject + SetBkMode that otherwise dominates }
{ rendering time on Win16. }
Params.WindowClass.Style := Params.WindowClass.Style or cs_OwnDC;
end;
procedure TKPAnsi.ClearBufRect(X, Y, W, H: Integer; BG: TColor);
var
R: TRect;
HBr: HBrush;
I: Integer;
begin
R.Left := X;
R.Top := Y;
R.Right := X + W;
R.Bottom := Y + H;
HBr := CreateSolidBrush(ColorToRGB(BG));
for I := 0 to 1 do
begin
if FBufDC[I] <> 0 then
FillRect(FBufDC[I], R, HBr);
end;
DeleteObject(HBr);
end;
procedure TKPAnsi.CreateBuffers;
var
ScreenDC: HDC;
I: Integer;
begin
DestroyBuffers;
FBufW := FCols * FCellWidth;
FBufH := FRows * FCellHeight;
if (FBufW < 1) or (FBufH < 1) then
Exit;
ScreenDC := GetDC(0);
for I := 0 to 1 do
begin
FBufDC[I] := CreateCompatibleDC(ScreenDC);
FBufBmp[I] := CreateCompatibleBitmap(ScreenDC, FBufW, FBufH);
FBufOldBmp[I] := SelectObject(FBufDC[I], FBufBmp[I]);
if FPaintFont <> 0 then
SelectObject(FBufDC[I], FPaintFont);
SetBkMode(FBufDC[I], OPAQUE);
end;
ReleaseDC(0, ScreenDC);
end;
procedure TKPAnsi.DestroyBuffers;
var
I: Integer;
begin
for I := 0 to 1 do
begin
if FBufDC[I] <> 0 then
begin
SelectObject(FBufDC[I], FBufOldBmp[I]);
DeleteObject(FBufBmp[I]);
DeleteDC(FBufDC[I]);
FBufDC[I] := 0;
FBufBmp[I] := 0;
FBufOldBmp[I] := 0;
end;
end;
end;
procedure TKPAnsi.DirtyAll;
begin
FAllDirty := True;
end;
procedure TKPAnsi.DirtyRow(Row: Integer);
begin
if (Row >= 0) and (Row <= 255) then
FDirtyRow[Row] := True;
end;
procedure TKPAnsi.DrawRow(Row: Integer);
begin
if (Row >= 0) and (Row < FScreen.Count) then
PaintLine(FScreen[Row], Row * FCellHeight);
end;
procedure TKPAnsi.PaintLine(Line: PTermLine; PixelY: Integer);
{ Render a line to both buffer DCs using batched TextOut. }
{ Groups consecutive cells with identical colors into single calls }
{ (typically 5-10 per row instead of 80 per-cell calls). }
var
Col: Integer;
BatchStart: Integer;
BatchLen: Integer;
I: Integer;
X: Integer;
CellFG: TColor;
CellBG: TColor;
CurFG: TColor;
CurBG: TColor;
HasBlink: Boolean;
Buf: array[0..255] of Char;
begin
if FBufDC[0] = 0 then
Exit;
{ Check if any cell on this line blinks }
HasBlink := False;
for Col := 0 to FCols - 1 do
begin
if Line^.Cells[Col].Blink then
begin
HasBlink := True;
Break;
end;
end;
if HasBlink then
begin
{ Blink row: must render to each buffer separately }
for I := 0 to 1 do
begin
if FBufDC[I] = 0 then
Continue;
CurFG := TColor(-1);
CurBG := TColor(-1);
BatchStart := 0;
BatchLen := 0;
for Col := 0 to FCols - 1 do
begin
CellBG := Line^.Cells[Col].BG;
if (I = 1) and Line^.Cells[Col].Blink then
CellFG := CellBG
else
CellFG := Line^.Cells[Col].FG;
if (CellFG <> CurFG) or (CellBG <> CurBG) then
begin
if BatchLen > 0 then
begin
X := BatchStart * FCellWidth;
WinProcs.TextOut(FBufDC[I], X, PixelY, @Buf[0], BatchLen);
end;
if CellFG <> CurFG then
begin
SetTextColor(FBufDC[I], ColorToRGB(CellFG));
CurFG := CellFG;
end;
if CellBG <> CurBG then
begin
SetBkColor(FBufDC[I], ColorToRGB(CellBG));
CurBG := CellBG;
end;
BatchStart := Col;
BatchLen := 0;
end;
Buf[BatchLen] := Line^.Cells[Col].Ch;
Inc(BatchLen);
end;
if BatchLen > 0 then
begin
X := BatchStart * FCellWidth;
WinProcs.TextOut(FBufDC[I], X, PixelY, @Buf[0], BatchLen);
end;
end;
end
else
begin
{ No blink: render to buffer 0 only, then copy row to buffer 1 }
CurFG := TColor(-1);
CurBG := TColor(-1);
BatchStart := 0;
BatchLen := 0;
for Col := 0 to FCols - 1 do
begin
CellFG := Line^.Cells[Col].FG;
CellBG := Line^.Cells[Col].BG;
if (CellFG <> CurFG) or (CellBG <> CurBG) then
begin
if BatchLen > 0 then
begin
X := BatchStart * FCellWidth;
WinProcs.TextOut(FBufDC[0], X, PixelY, @Buf[0], BatchLen);
end;
if CellFG <> CurFG then
begin
SetTextColor(FBufDC[0], ColorToRGB(CellFG));
CurFG := CellFG;
end;
if CellBG <> CurBG then
begin
SetBkColor(FBufDC[0], ColorToRGB(CellBG));
CurBG := CellBG;
end;
BatchStart := Col;
BatchLen := 0;
end;
Buf[BatchLen] := Line^.Cells[Col].Ch;
Inc(BatchLen);
end;
if BatchLen > 0 then
begin
X := BatchStart * FCellWidth;
WinProcs.TextOut(FBufDC[0], X, PixelY, @Buf[0], BatchLen);
end;
{ Copy rendered row from buffer 0 to buffer 1 }
if FBufDC[1] <> 0 then
BitBlt(FBufDC[1], 0, PixelY, FBufW, FCellHeight,
FBufDC[0], 0, PixelY, SRCCOPY);
end;
end;
procedure TKPAnsi.FlipToScreen;
var
DC: HDC;
Row: Integer;
I: Integer;
MinDirty: Integer;
MaxDirty: Integer;
FullBlt: Boolean;
Line: PTermLine;
X: Integer;
Y: Integer;
SrcY: Integer;
H: Integer;
R: TRect;
ScrollY: Integer;
begin
if not HandleAllocated then
Exit;
if FBufDC[0] = 0 then
RecalcCellSize;
if FBufDC[0] = 0 then
Exit;
FullBlt := FAllDirty;
if FScrollPos <> 0 then
begin
{ Scrollback view: full redraw from scrollback + screen data }
RedrawBuffers;
FPendingScroll := 0;
FullBlt := True;
end
else
begin
{ Apply deferred scroll to both buffer DCs. ScrollDC here is }
{ safe because all parsing is complete and dirty flags have been }
{ shifted to match the new line positions by DoScrollUp. }
if (FPendingScroll > 0) and not FAllDirty then
begin
R.Left := 0;
R.Top := 0;
R.Right := FBufW;
R.Bottom := FBufH;
ScrollY := FPendingScroll * FCellHeight;
for I := 0 to 1 do
begin
if FBufDC[I] <> 0 then
ScrollDC(FBufDC[I], 0, -ScrollY, R, R, 0, nil);
end;
end;
FPendingScroll := 0;
{ Render only dirty rows into both buffers (batched TextOut) }
MinDirty := FRows;
MaxDirty := -1;
for Row := 0 to FRows - 1 do
begin
if FAllDirty or FDirtyRow[Row] then
begin
if Row < FScreen.Count then
PaintLine(FScreen[Row], Row * FCellHeight);
FDirtyRow[Row] := False;
if Row < MinDirty then
MinDirty := Row;
if Row > MaxDirty then
MaxDirty := Row;
end;
end;
FAllDirty := False;
end;
DC := GetDC(Handle);
if FullBlt then
begin
BitBlt(DC, 0, 0, FBufW, FBufH,
FBufDC[FBlinkPhase], 0, 0, SRCCOPY);
end
else if MaxDirty >= 0 then
begin
{ Partial BitBlt: only the dirty row band }
SrcY := MinDirty * FCellHeight;
H := (MaxDirty - MinDirty + 1) * FCellHeight;
BitBlt(DC, 0, SrcY, FBufW, H,
FBufDC[FBlinkPhase], 0, SrcY, SRCCOPY);
end;
{ Cursor overlay -- drawn directly to screen DC. CS_OWNDC keeps }
{ FPaintFont and OPAQUE BkMode set from RecalcCellSize; re-assert }
{ them here in case VCL Paint altered the DC state. }
if FCursorVisible and FBlinkOn and (FScrollPos = 0) and
(FCursorRow >= 0) and (FCursorRow < FRows) and
(FCursorRow < FScreen.Count) and
(FCursorCol >= 0) and (FCursorCol < FCols) then
begin
SelectObject(DC, FPaintFont);
SetBkMode(DC, OPAQUE);
Line := FScreen[FCursorRow];
X := FCursorCol * FCellWidth;
Y := FCursorRow * FCellHeight;
SetTextColor(DC, ColorToRGB(Line^.Cells[FCursorCol].BG));
SetBkColor(DC, ColorToRGB(Line^.Cells[FCursorCol].FG));
WinProcs.TextOut(DC, X, Y, @Line^.Cells[FCursorCol].Ch, 1);
end;
ReleaseDC(Handle, DC);
end;
procedure TKPAnsi.RedrawBuffers;
var
Row: Integer;
VisRow: Integer;
SbkCount: Integer;
Line: PTermLine;
begin
if FBufDC[0] = 0 then
Exit;
SbkCount := FScrollback.Count;
for Row := 0 to FRows - 1 do
begin
VisRow := Row - FScrollPos;
if VisRow < 0 then
begin
if (SbkCount + VisRow >= 0) and (SbkCount + VisRow < SbkCount) then
Line := FScrollback[SbkCount + VisRow]
else
Line := nil;
end
else if VisRow < FScreen.Count then
Line := FScreen[VisRow]
else
Line := nil;
if Line = nil then
ClearBufRect(0, Row * FCellHeight, FBufW, FCellHeight, AnsiColors[0])
else
PaintLine(Line, Row * FCellHeight);
end;
end;
procedure TKPAnsi.DeleteChars(N: Integer);
var
Line: PTermLine;
I: Integer;
begin
if N < 1 then
N := 1;
Line := FScreen[FCursorRow];
for I := FCursorCol to FCols - 1 - N do
Line^.Cells[I] := Line^.Cells[I + N];
for I := FCols - N to FCols - 1 do
begin
if I >= 0 then
begin
Line^.Cells[I].Ch := ' ';
Line^.Cells[I].FG := AnsiColors[7];
Line^.Cells[I].BG := AnsiColors[0];
Line^.Cells[I].Bold := False;
Line^.Cells[I].Blink := False;
end;
end;
FDirtyRow[FCursorRow] := True;
end;
procedure TKPAnsi.DeleteLines(N: Integer);
var
I: Integer;
J: Integer;
Line: PTermLine;
begin
if N < 1 then
N := 1;
for I := 1 to N do
begin
if FCursorRow < FScreen.Count then
begin
Line := FScreen[FCursorRow];
FreeMem(Line, SizeOf(TTermLineRec));
FScreen.Delete(FCursorRow);
GetMem(Line, SizeOf(TTermLineRec));
AllocLine(Line);
FScreen.Add(Line);
end;
end;
for J := FCursorRow to FRows - 1 do
FDirtyRow[J] := True;
end;
destructor TKPAnsi.Destroy;
begin
if FTimerActive and HandleAllocated then
begin
KillTimer(Handle, 1);
FTimerActive := False;
end;
DestroyBuffers;
if (FPaintFont <> 0) and not FStockFont then
begin
DeleteObject(FPaintFont);
FPaintFont := 0;
end;
FreeLineList(FScreen);
FScreen.Free;
FreeLineList(FScrollback);
FScrollback.Free;
inherited Destroy;
end;
procedure TKPAnsi.DoScrollDown;
var
Line: PTermLine;
begin
if FScreen.Count < FRows then
Exit;
{ Remove bottom line }
Line := FScreen[FScreen.Count - 1];
FreeMem(Line, SizeOf(TTermLineRec));
FScreen.Delete(FScreen.Count - 1);
{ Insert blank line at top }
GetMem(Line, SizeOf(TTermLineRec));
AllocLine(Line);
FScreen.Insert(0, Line);
{ Scroll down is rare; just repaint everything }
FAllDirty := True;
FPendingScroll := 0;
end;
procedure TKPAnsi.DoScrollUp;
var
Line: PTermLine;
I: Integer;
begin
if FScreen.Count < FRows then
Exit;
{ Move top line to scrollback }
Line := FScreen[0];
FScrollback.Add(Line);
FScreen.Delete(0);
TrimScrollback;
{ Add blank line at bottom }
GetMem(Line, SizeOf(TTermLineRec));
AllocLine(Line);
FScreen.Add(Line);
UpdateScrollbar;
Inc(FPendingScroll);
if FPendingScroll >= FRows then
begin
{ Scrolled more than one screen; just repaint everything }
FAllDirty := True;
FPendingScroll := 0;
end
else
begin
{ Shift dirty flags up to match the scrolled line positions }
for I := 1 to FRows - 1 do
FDirtyRow[I - 1] := FDirtyRow[I];
FDirtyRow[FRows - 1] := True;
end;
end;
procedure TKPAnsi.EndUpdate;
var
Now: Longint;
begin
Dec(FUpdateCount);
if FUpdateCount <= 0 then
begin
FUpdateCount := 0;
{ Render immediately if enough time has elapsed. This avoids }
{ depending on WM_TIMER, which is starved by continuous }
{ WM_COMMNOTIFY messages during high-speed data reception. }
Now := GetTickCount;
if Now - FLastRenderTick >= RenderTickMs then
begin
FLastRenderTick := Now;
FlipToScreen;
end;
end;
end;
procedure TKPAnsi.EraseDisplay(Mode: Integer);
var
I: Integer;
J: Integer;
Line: PTermLine;
begin
case Mode of
0: { Erase below: current position to end of screen }
begin
{ Erase rest of current line }
Line := FScreen[FCursorRow];
for J := FCursorCol to FCols - 1 do
begin
Line^.Cells[J].Ch := ' ';
Line^.Cells[J].FG := AnsiColors[7];
Line^.Cells[J].BG := AnsiColors[0];
Line^.Cells[J].Bold := False;
Line^.Cells[J].Blink := False;
end;
{ Erase all lines below }
for I := FCursorRow + 1 to FScreen.Count - 1 do
begin
ClearLine(FScreen[I]);
end;
end;
1: { Erase above: start of screen to current position }
begin
{ Erase all lines above }
for I := 0 to FCursorRow - 1 do
begin
ClearLine(FScreen[I]);
end;
{ Erase current line up to and including cursor }
Line := FScreen[FCursorRow];
for J := 0 to FCursorCol do
begin
Line^.Cells[J].Ch := ' ';
Line^.Cells[J].FG := AnsiColors[7];
Line^.Cells[J].BG := AnsiColors[0];
Line^.Cells[J].Bold := False;
Line^.Cells[J].Blink := False;
end;
end;
2: { Erase all: move screen to scrollback, allocate fresh }
begin
for I := 0 to FScreen.Count - 1 do
begin
FScrollback.Add(FScreen[I]);
end;
FScreen.Clear;
TrimScrollback;
for I := 0 to FRows - 1 do
begin
GetMem(Line, SizeOf(TTermLineRec));
AllocLine(Line);
FScreen.Add(Line);
end;
UpdateScrollbar;
end;
end;
{ Mark affected rows dirty for deferred batch rendering }
case Mode of
0:
for I := FCursorRow to FRows - 1 do
FDirtyRow[I] := True;
1:
for I := 0 to FCursorRow do
FDirtyRow[I] := True;
2:
FAllDirty := True;
end;
end;
procedure TKPAnsi.EraseLine(Mode: Integer);
var
J: Integer;
Line: PTermLine;
begin
Line := FScreen[FCursorRow];
case Mode of
0: { Erase from cursor to end of line }
begin
for J := FCursorCol to FCols - 1 do
begin
Line^.Cells[J].Ch := ' ';
Line^.Cells[J].FG := AnsiColors[7];
Line^.Cells[J].BG := AnsiColors[0];
Line^.Cells[J].Bold := False;
Line^.Cells[J].Blink := False;
end;
end;
1: { Erase from start of line to cursor }
begin
for J := 0 to FCursorCol do
begin
Line^.Cells[J].Ch := ' ';
Line^.Cells[J].FG := AnsiColors[7];
Line^.Cells[J].BG := AnsiColors[0];
Line^.Cells[J].Bold := False;
Line^.Cells[J].Blink := False;
end;
end;
2: { Erase entire line }
ClearLine(Line);
end;
FDirtyRow[FCursorRow] := True;
end;
procedure TKPAnsi.ExecuteCSI(FinalCh: Char);
var
Params: array[0..15] of Integer;
Count: Integer;
P1: Integer;
P2: Integer;
begin
ParseParams(FParamStr, Params, Count);
if Count > 0 then
P1 := Params[0]
else
P1 := 0;
if Count > 1 then
P2 := Params[1]
else
P2 := 0;
case FinalCh of
'A': { CUU - Cursor Up }
begin
if P1 < 1 then
P1 := 1;
FCursorRow := FCursorRow - P1;
if FCursorRow < 0 then
FCursorRow := 0;
end;
'B': { CUD - Cursor Down }
begin
if P1 < 1 then
P1 := 1;
FCursorRow := FCursorRow + P1;
if FCursorRow >= FRows then
FCursorRow := FRows - 1;
end;
'C': { CUF - Cursor Forward }
begin
if P1 < 1 then
P1 := 1;
FCursorCol := FCursorCol + P1;
if FCursorCol >= FCols then
FCursorCol := FCols - 1;
end;
'D': { CUB - Cursor Back }
begin
if P1 < 1 then
P1 := 1;
FCursorCol := FCursorCol - P1;
if FCursorCol < 0 then
FCursorCol := 0;
end;
'H', 'f': { CUP/HVP - Cursor Position (1-based params) }
begin
if P1 < 1 then
P1 := 1;
if P2 < 1 then
P2 := 1;
FCursorRow := P1 - 1;
FCursorCol := P2 - 1;
if FCursorRow >= FRows then
FCursorRow := FRows - 1;
if FCursorCol >= FCols then
FCursorCol := FCols - 1;
end;
'J': { ED - Erase Display }
begin
EraseDisplay(P1);
end;
'K': { EL - Erase Line }
begin
EraseLine(P1);
end;
'L': { IL - Insert Lines }
begin
InsertLines(P1);
end;
'M': { DL - Delete Lines }
begin
DeleteLines(P1);
end;
'P': { DCH - Delete Characters }
begin
DeleteChars(P1);
end;
'S': { SU - Scroll Up }
begin
if P1 < 1 then
P1 := 1;
while P1 > 0 do
begin
DoScrollUp;
Dec(P1);
end;
end;
'T': { SD - Scroll Down }
begin
if P1 < 1 then
P1 := 1;
while P1 > 0 do
begin
DoScrollDown;
Dec(P1);
end;
end;
'@': { ICH - Insert Characters }
begin
InsertChars(P1);
end;
'm': { SGR - Set Graphic Rendition }
begin
ParseSGR;
end;
's': { SCP - Save Cursor Position }
begin
FSaveCurRow := FCursorRow;
FSaveCurCol := FCursorCol;
end;
'c': { DA - Device Attributes }
begin
{ Respond as VT100 with no options }
if Assigned(FOnKeyData) then
FOnKeyData(Self, #27'[?1;0c');
end;
'n': { DSR - Device Status Report }
begin
if P1 = 5 then
begin
{ Terminal status: report OK }
if Assigned(FOnKeyData) then
FOnKeyData(Self, #27'[0n');
end
else if P1 = 6 then
begin
{ Cursor Position Report: respond with ESC[row;colR (1-based) }
if Assigned(FOnKeyData) then
FOnKeyData(Self, #27'[' + IntToStr(FCursorRow + 1) + ';' +
IntToStr(FCursorCol + 1) + 'R');
end;
end;
'u': { RCP - Restore Cursor Position }
begin
FCursorRow := FSaveCurRow;
FCursorCol := FSaveCurCol;
if FCursorRow >= FRows then
FCursorRow := FRows - 1;
if FCursorCol >= FCols then
FCursorCol := FCols - 1;
end;
end;
end;
procedure TKPAnsi.ExecuteMusic;
var
Tempo: Integer;
DefLen: Integer;
Octave: Integer;
I: Integer;
Ch: Char;
NoteIdx: Integer;
Duration: Integer;
Dotted: Boolean;
NoteDurMs: Integer;
Freq: Integer;
OctMul: Integer;
J: Integer;
NumStr: string;
begin
if Length(FMusicStr) = 0 then
Exit;
Tempo := 120;
DefLen := 4;
Octave := 4;
{ Open sound device }
OpenSound;
I := 1;
while I <= Length(FMusicStr) do
begin
Ch := UpCase(FMusicStr[I]);
Inc(I);
case Ch of
'T': { Tempo }
begin
NumStr := '';
while (I <= Length(FMusicStr)) and
(FMusicStr[I] >= '0') and (FMusicStr[I] <= '9') do
begin
NumStr := NumStr + FMusicStr[I];
Inc(I);
end;
if Length(NumStr) > 0 then
Tempo := StrToIntDef(NumStr, 120);
if Tempo < 32 then
Tempo := 32;
if Tempo > 255 then
Tempo := 255;
end;
'L': { Default length }
begin
NumStr := '';
while (I <= Length(FMusicStr)) and
(FMusicStr[I] >= '0') and (FMusicStr[I] <= '9') do
begin
NumStr := NumStr + FMusicStr[I];
Inc(I);
end;
if Length(NumStr) > 0 then
DefLen := StrToIntDef(NumStr, 4);
if DefLen < 1 then
DefLen := 1;
end;
'O': { Octave }
begin
NumStr := '';
while (I <= Length(FMusicStr)) and
(FMusicStr[I] >= '0') and (FMusicStr[I] <= '9') do
begin
NumStr := NumStr + FMusicStr[I];
Inc(I);
end;
if Length(NumStr) > 0 then
Octave := StrToIntDef(NumStr, 4);
if Octave < 0 then
Octave := 0;
if Octave > 7 then
Octave := 7;
end;
'>': { Octave up }
begin
if Octave < 7 then
Inc(Octave);
end;
'<': { Octave down }
begin
if Octave > 0 then
Dec(Octave);
end;
'A'..'G': { Note }
begin
{ Map note letter to semitone index: C=0 D=2 E=4 F=5 G=7 A=9 B=11 }
case Ch of
'C': NoteIdx := 0;
'D': NoteIdx := 2;
'E': NoteIdx := 4;
'F': NoteIdx := 5;
'G': NoteIdx := 7;
'A': NoteIdx := 9;
'B': NoteIdx := 11;
else NoteIdx := 0;
end;
{ Check for sharp/flat }
if I <= Length(FMusicStr) then
begin
if (FMusicStr[I] = '#') or (FMusicStr[I] = '+') then
begin
Inc(NoteIdx);
if NoteIdx > 11 then
NoteIdx := 11;
Inc(I);
end
else if FMusicStr[I] = '-' then
begin
Dec(NoteIdx);
if NoteIdx < 0 then
NoteIdx := 0;
Inc(I);
end;
end;
{ Parse optional duration }
Duration := 0;
NumStr := '';
while (I <= Length(FMusicStr)) and
(FMusicStr[I] >= '0') and (FMusicStr[I] <= '9') do
begin
NumStr := NumStr + FMusicStr[I];
Inc(I);
end;
if Length(NumStr) > 0 then
Duration := StrToIntDef(NumStr, 0);
if Duration < 1 then
Duration := DefLen;
{ Check for dot }
Dotted := False;
if (I <= Length(FMusicStr)) and (FMusicStr[I] = '.') then
begin
Dotted := True;
Inc(I);
end;
{ Calculate duration in ms: whole note = 4 beats, beat = 60000/tempo ms }
NoteDurMs := (4 * 60000) div (Tempo * Duration);
if Dotted then
NoteDurMs := (NoteDurMs * 3) div 2;
{ Calculate frequency }
Freq := BaseNoteFreq[NoteIdx];
OctMul := 1;
for J := 1 to Octave do
begin
OctMul := OctMul * 2;
end;
Freq := (Freq * OctMul) div 16; { BaseNoteFreq is at octave 4 }
{ Queue the note }
SetVoiceAccent(1, Tempo, 128, 0, 0);
SetVoiceNote(1, Freq, Duration, 0);
end;
'P': { Pause/Rest }
begin
Duration := 0;
NumStr := '';
while (I <= Length(FMusicStr)) and
(FMusicStr[I] >= '0') and (FMusicStr[I] <= '9') do
begin
NumStr := NumStr + FMusicStr[I];
Inc(I);
end;
if Length(NumStr) > 0 then
Duration := StrToIntDef(NumStr, 0);
if Duration < 1 then
Duration := DefLen;
{ Dotted rest }
if (I <= Length(FMusicStr)) and (FMusicStr[I] = '.') then
Inc(I);
SetVoiceNote(1, 0, Duration, 0);
end;
end;
end;
StartSound;
CloseSound;
end;
procedure TKPAnsi.FreeLineList(List: TList);
var
I: Integer;
begin
for I := 0 to List.Count - 1 do
begin
FreeMem(PTermLine(List[I]), SizeOf(TTermLineRec));
end;
List.Clear;
end;
function TKPAnsi.GetCursorCol: Integer;
begin
Result := FCursorCol;
end;
function TKPAnsi.GetCursorRow: Integer;
begin
Result := FCursorRow;
end;
procedure TKPAnsi.InsertChars(N: Integer);
var
Line: PTermLine;
I: Integer;
begin
if N < 1 then
N := 1;
Line := FScreen[FCursorRow];
for I := FCols - 1 downto FCursorCol + N do
Line^.Cells[I] := Line^.Cells[I - N];
for I := FCursorCol to FCursorCol + N - 1 do
begin
if I < FCols then
begin
Line^.Cells[I].Ch := ' ';
Line^.Cells[I].FG := AnsiColors[7];
Line^.Cells[I].BG := AnsiColors[0];
Line^.Cells[I].Bold := False;
Line^.Cells[I].Blink := False;
end;
end;
FDirtyRow[FCursorRow] := True;
end;
procedure TKPAnsi.InsertLines(N: Integer);
var
I: Integer;
J: Integer;
Line: PTermLine;
begin
if N < 1 then
N := 1;
for I := 1 to N do
begin
if FScreen.Count > 0 then
begin
Line := FScreen[FScreen.Count - 1];
FreeMem(Line, SizeOf(TTermLineRec));
FScreen.Delete(FScreen.Count - 1);
end;
GetMem(Line, SizeOf(TTermLineRec));
AllocLine(Line);
FScreen.Insert(FCursorRow, Line);
end;
for J := FCursorRow to FRows - 1 do
FDirtyRow[J] := True;
end;
procedure TKPAnsi.KeyDown(var Key: Word; Shift: TShiftState);
var
S: string;
begin
S := '';
case Key of
vk_Up:
S := #27'[A';
vk_Down:
S := #27'[B';
vk_Right:
S := #27'[C';
vk_Left:
S := #27'[D';
vk_Home:
S := #27'[H';
vk_End:
S := #27'[K';
vk_Prior: { Page Up }
S := #27'[V';
vk_Next: { Page Down }
S := #27'[U';
vk_Insert:
S := #27'[@';
vk_Delete:
S := #27#127;
vk_F1:
S := #27'OP';
vk_F2:
S := #27'OQ';
vk_F3:
S := #27'OR';
vk_F4:
S := #27'OS';
vk_F5:
S := #27'Ot';
vk_F6:
S := #27'Ou';
vk_F7:
S := #27'Ov';
vk_F8:
S := #27'Ow';
vk_F9:
S := #27'Ox';
vk_F10:
S := #27'Oy';
end;
if (Length(S) > 0) and Assigned(FOnKeyData) then
begin
FOnKeyData(Self, S);
Key := 0;
end;
inherited KeyDown(Key, Shift);
end;
procedure TKPAnsi.KeyPress(var Key: Char);
var
S: string;
begin
if Key = #13 then
S := #13
else if Key >= ' ' then
S := Key
else if Key = #8 then
S := #8
else if Key = #9 then
S := #9
else if Key = #27 then
S := #27
else
S := '';
if (Length(S) > 0) and Assigned(FOnKeyData) then
begin
FOnKeyData(Self, S);
end;
inherited KeyPress(Key);
end;
procedure TKPAnsi.Paint;
var
Row: Integer;
Line: PTermLine;
X: Integer;
Y: Integer;
begin
if FBufDC[0] = 0 then
RecalcCellSize;
if FBufDC[0] = 0 then
Exit;
{ Full repaint: render all rows into buffers }
FPendingScroll := 0;
for Row := 0 to FRows - 1 do
begin
if Row < FScreen.Count then
PaintLine(FScreen[Row], Row * FCellHeight);
FDirtyRow[Row] := False;
end;
FAllDirty := False;
{ BitBlt to canvas (provided by VCL WM_PAINT handler) }
BitBlt(Canvas.Handle, 0, 0, FBufW, FBufH,
FBufDC[FBlinkPhase], 0, 0, SRCCOPY);
{ Cursor overlay -- VCL may have selected its own font into the }
{ canvas DC, so re-assert FPaintFont for correct cell dimensions. }
if FCursorVisible and FBlinkOn and (FScrollPos = 0) and
(FCursorRow >= 0) and (FCursorRow < FRows) and
(FCursorRow < FScreen.Count) and
(FCursorCol >= 0) and (FCursorCol < FCols) then
begin
SelectObject(Canvas.Handle, FPaintFont);
SetBkMode(Canvas.Handle, OPAQUE);
Line := FScreen[FCursorRow];
X := FCursorCol * FCellWidth;
Y := FCursorRow * FCellHeight;
SetTextColor(Canvas.Handle, ColorToRGB(Line^.Cells[FCursorCol].BG));
SetBkColor(Canvas.Handle, ColorToRGB(Line^.Cells[FCursorCol].FG));
WinProcs.TextOut(Canvas.Handle, X, Y, @Line^.Cells[FCursorCol].Ch, 1);
end;
end;
procedure TKPAnsi.ParseData(const S: string);
var
I: Integer;
begin
for I := 1 to Length(S) do
ProcessChar(S[I]);
{ Snap to bottom on new data }
if FScrollPos <> 0 then
begin
FScrollPos := 0;
UpdateScrollbar;
FAllDirty := True;
end;
{ Reset cursor blink to visible on new data }
FBlinkOn := True;
if FUpdateCount = 0 then
begin
if GetTickCount - FLastRenderTick >= RenderTickMs then
begin
FLastRenderTick := GetTickCount;
FlipToScreen;
end;
end;
end;
procedure TKPAnsi.ParseSGR;
var
Params: array[0..15] of Integer;
Count: Integer;
I: Integer;
Code: Integer;
begin
ParseParams(FParamStr, Params, Count);
{ SGR with no parameters means reset }
if Count = 0 then
begin
FAttrFG := 7;
FAttrBG := 0;
FAttrBold := False;
FAttrBlink := False;
FAttrReverse := False;
Exit;
end;
for I := 0 to Count - 1 do
begin
Code := Params[I];
case Code of
0: { Reset }
begin
FAttrFG := 7;
FAttrBG := 0;
FAttrBold := False;
FAttrBlink := False;
FAttrReverse := False;
end;
1: { Bold }
FAttrBold := True;
5: { Blink }
FAttrBlink := True;
7: { Reverse }
FAttrReverse := True;
22: { Normal intensity (cancel bold) }
FAttrBold := False;
25: { Blink off }
FAttrBlink := False;
27: { Reverse off }
FAttrReverse := False;
30..37: { Foreground color }
FAttrFG := Code - 30;
40..47: { Background color }
FAttrBG := Code - 40;
end;
end;
end;
procedure TKPAnsi.ProcessChar(Ch: Char);
var
FGIdx: Integer;
BGIdx: Integer;
TabCol: Integer;
Line: PTermLine;
begin
case FParseState of
psNormal:
begin
case Ch of
#27: { ESC }
FParseState := psEscape;
#13: { CR }
FCursorCol := 0;
#10: { LF }
begin
Inc(FCursorRow);
if FCursorRow >= FRows then
begin
FCursorRow := FRows - 1;
DoScrollUp;
end;
end;
#8: { BS }
begin
if FCursorCol > 0 then
Dec(FCursorCol);
end;
#9: { TAB }
begin
TabCol := ((FCursorCol div 8) + 1) * 8;
if TabCol >= FCols then
TabCol := FCols - 1;
FCursorCol := TabCol;
end;
#5: { ENQ - Answerback }
begin
if Assigned(FOnKeyData) then
FOnKeyData(Self, #27'[?1;0c');
end;
#7: { BEL }
MessageBeep(0);
else
begin
{ Printable character }
if (FCursorCol >= FCols) then
begin
if FWrapMode then
begin
FCursorCol := 0;
Inc(FCursorRow);
if FCursorRow >= FRows then
begin
FCursorRow := FRows - 1;
DoScrollUp;
end;
end
else
begin
FCursorCol := FCols - 1;
end;
end;
{ Calculate effective colors. Bold maps FG to bright }
{ (index + 8). Blink is stored as a cell attribute }
{ and rendered in Paint -- NOT mapped to bright BG, so }
{ colored backgrounds (SGR 40-47) display correctly. }
if FAttrBold then
FGIdx := FAttrFG + 8
else
FGIdx := FAttrFG;
BGIdx := FAttrBG;
Line := FScreen[FCursorRow];
if FAttrReverse then
begin
Line^.Cells[FCursorCol].FG := AnsiColors[BGIdx];
Line^.Cells[FCursorCol].BG := AnsiColors[FGIdx];
end
else
begin
Line^.Cells[FCursorCol].FG := AnsiColors[FGIdx];
Line^.Cells[FCursorCol].BG := AnsiColors[BGIdx];
end;
Line^.Cells[FCursorCol].Ch := Ch;
Line^.Cells[FCursorCol].Bold := FAttrBold;
Line^.Cells[FCursorCol].Blink := FAttrBlink;
{ Mark row dirty for deferred batch rendering }
FDirtyRow[FCursorRow] := True;
Inc(FCursorCol);
end;
end;
end;
psEscape:
begin
case Ch of
'[':
begin
FParamStr := '';
FParseState := psCSI;
end;
else
begin
{ Unrecognized escape sequence, return to normal }
FParseState := psNormal;
end;
end;
end;
psCSI:
begin
case Ch of
'0'..'9', ';':
begin
FParamStr := FParamStr + Ch;
end;
'?':
begin
FParseState := psCSIQuestion;
end;
'M':
begin
{ Check if this is ANSI music: ESC[M starts music mode }
if Length(FParamStr) = 0 then
begin
FMusicStr := '';
FParseState := psMusic;
end
else
begin
{ DL - Delete Lines with params }
ExecuteCSI('M');
FParseState := psNormal;
end;
end;
else
begin
{ Final byte: execute the command }
ExecuteCSI(Ch);
FParseState := psNormal;
end;
end;
end;
psCSIQuestion:
begin
case Ch of
'0'..'9', ';':
FParamStr := FParamStr + Ch;
'h': { Set Mode }
begin
if FParamStr = '7' then
FWrapMode := True
else if FParamStr = '25' then
FCursorVisible := True;
FParseState := psNormal;
end;
'l': { Reset Mode }
begin
if FParamStr = '7' then
FWrapMode := False
else if FParamStr = '25' then
FCursorVisible := False;
FParseState := psNormal;
end;
else
begin
{ Unrecognized DEC private mode, return to normal }
FParseState := psNormal;
end;
end;
end;
psMusic:
begin
if Ch = #14 then { Ctrl-N terminates music }
begin
ExecuteMusic;
FParseState := psNormal;
end
else
begin
FMusicStr := FMusicStr + Ch;
end;
end;
end;
end;
procedure TKPAnsi.RecalcCellSize;
var
DC: HDC;
Extent: Longint;
begin
if not HandleAllocated then
Exit;
{ Recreate the OEM charset paint font from current Font properties }
CreatePaintFont;
{ Measure character size and configure screen DC. CS_OWNDC keeps }
{ these settings across GetDC/ReleaseDC calls, so the font and }
{ BkMode persist for cursor overlay rendering in FlipToScreen. }
DC := GetDC(Handle);
try
SelectObject(DC, FPaintFont);
SetBkMode(DC, OPAQUE);
Extent := GetTextExtent(DC, 'W', 1);
FCellWidth := LoWord(Extent);
FCellHeight := HiWord(Extent);
finally
ReleaseDC(Handle, DC);
end;
if FCellWidth < 1 then
FCellWidth := 8;
if FCellHeight < 1 then
FCellHeight := 16;
{ Resize control to fit terminal dimensions }
Width := FCols * FCellWidth + GetSystemMetrics(sm_CxVScroll);
Height := FRows * FCellHeight;
{ (Re)create dual bitmaps; mark all rows dirty for next render }
CreateBuffers;
FAllDirty := True;
{ Start render/blink timer }
if not FTimerActive then
begin
SetTimer(Handle, 1, RenderTickMs, nil);
FTimerActive := True;
end;
Invalidate;
end;
procedure TKPAnsi.Reset;
begin
FAttrFG := 7;
FAttrBG := 0;
FAttrBold := False;
FAttrBlink := False;
FAttrReverse := False;
FParseState := psNormal;
FParamStr := '';
FMusicStr := '';
FWrapMode := True;
FSaveCurRow := 0;
FSaveCurCol := 0;
Clear;
end;
procedure TKPAnsi.ResizeScreen;
var
I: Integer;
Line: PTermLine;
begin
{ Free existing screen lines }
FreeLineList(FScreen);
{ Allocate new screen lines }
for I := 0 to FRows - 1 do
begin
GetMem(Line, SizeOf(TTermLineRec));
AllocLine(Line);
FScreen.Add(Line);
end;
FCursorRow := 0;
FCursorCol := 0;
FScrollPos := 0;
UpdateScrollbar;
RecalcCellSize;
end;
procedure TKPAnsi.SetCols(Value: Integer);
begin
if Value < 1 then
Value := 1;
if Value > 256 then
Value := 256;
if Value <> FCols then
begin
FCols := Value;
ResizeScreen;
end;
end;
procedure TKPAnsi.SetCursorVisible(Value: Boolean);
begin
if Value <> FCursorVisible then
begin
FCursorVisible := Value;
{ Mark cursor row dirty so BitBlt erases/redraws cursor overlay }
FDirtyRow[FCursorRow] := True;
FlipToScreen;
end;
end;
procedure TKPAnsi.SetRows(Value: Integer);
begin
if Value < 1 then
Value := 1;
if Value > 255 then
Value := 255;
if Value <> FRows then
begin
FRows := Value;
ResizeScreen;
end;
end;
procedure TKPAnsi.SetScrollbackSize(Value: Integer);
begin
if Value < 0 then
Value := 0;
FScrollbackSize := Value;
TrimScrollback;
end;
procedure TKPAnsi.TrimScrollback;
var
Line: PTermLine;
begin
while FScrollback.Count > FScrollbackSize do
begin
Line := FScrollback[0];
FreeMem(Line, SizeOf(TTermLineRec));
FScrollback.Delete(0);
end;
end;
procedure TKPAnsi.UpdateScrollbar;
var
SbkCount: Integer;
begin
if not HandleAllocated then
Exit;
SbkCount := FScrollback.Count;
if SbkCount > 0 then
begin
SetScrollRange(Handle, sb_Vert, 0, SbkCount, False);
SetScrollPos(Handle, sb_Vert, SbkCount - FScrollPos, True);
end
else
begin
SetScrollRange(Handle, sb_Vert, 0, 0, False);
SetScrollPos(Handle, sb_Vert, 0, True);
end;
end;
procedure TKPAnsi.WMEraseBkgnd(var Msg: TWMEraseBkgnd);
begin
{ Suppress background erase -- TextOut with OPAQUE covers everything }
Msg.Result := 1;
end;
procedure TKPAnsi.WMGetDlgCode(var Msg: TMessage);
begin
Msg.Result := dlgc_WantArrows or dlgc_WantTab or dlgc_WantChars;
end;
procedure TKPAnsi.WMTimer(var Msg: TWMTimer);
begin
{ Blink counter: toggle cursor and text blink every BlinkInterval ticks }
Inc(FBlinkCount);
if FBlinkCount >= BlinkInterval then
begin
FBlinkCount := 0;
FBlinkOn := not FBlinkOn;
Inc(FBlinkPhase);
if FBlinkPhase > 1 then
FBlinkPhase := 0;
end;
{ Render pending dirty rows and/or update blink state. This also }
{ catches any data that arrived just before a throttle boundary }
{ in EndUpdate (worst-case latency: one timer tick, ~55 ms). }
FlipToScreen;
FLastRenderTick := GetTickCount;
end;
procedure TKPAnsi.WMVScroll(var Msg: TWMScroll);
var
SbkCount: Integer;
NewPos: Integer;
begin
SbkCount := FScrollback.Count;
if SbkCount = 0 then
Exit;
NewPos := FScrollPos;
case Msg.ScrollCode of
sb_LineUp:
Inc(NewPos);
sb_LineDown:
Dec(NewPos);
sb_PageUp:
Inc(NewPos, FRows);
sb_PageDown:
Dec(NewPos, FRows);
sb_ThumbPosition, sb_ThumbTrack:
NewPos := SbkCount - Msg.Pos;
sb_Top:
NewPos := SbkCount;
sb_Bottom:
NewPos := 0;
end;
if NewPos < 0 then
NewPos := 0;
if NewPos > SbkCount then
NewPos := SbkCount;
if NewPos <> FScrollPos then
begin
FScrollPos := NewPos;
SetScrollPos(Handle, sb_Vert, SbkCount - FScrollPos, True);
FlipToScreen;
end;
end;
procedure TKPAnsi.Write(const S: string);
begin
if Length(S) > 0 then
ParseData(S);
end;
{ ----------------------------------------------------------------------- }
{ Component registration }
{ ----------------------------------------------------------------------- }
procedure Register;
begin
RegisterComponents('KP', [TKPAnsi]);
end;
end.
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