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WinComm/delphi/KPANSI.PAS
Scott Duensing 9102dd1938 Fix cursor ghost at end of lines when cursor changes rows 
WriteDeferredBuf now dirties the old cursor row before the render
loop so the reverse-video cursor block is erased.  FlipToScreen's
ghost cleanup was ineffective because FLastCursorRow was already
updated by WriteDeferredBuf.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-03 16:58:56 -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. }
{ }
{ Split-phase rendering: WriteDeferredBuf first parses the entire input }
{ buffer into the cell buffer (pure CPU, no GDI calls), then renders all }
{ dirty rows in one batch via RenderRow. Scroll-ups are coalesced into }
{ a single ScrollDC call. Separating parsing from rendering keeps the }
{ parsing loop cache-hot and avoids interleaving GDI kernel transitions }
{ with CPU work. FlipToScreen handles blink and fallback paths. }
{ }
{ 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: Byte; { palette index 0-15 }
BG: Byte; { palette index 0-15 }
Bold: Boolean;
Blink: Boolean;
end;
PTermLine = ^TTermLineRec;
TTermLineRec = record
Cells: array[0..255] of TTermCell;
end;
TKPAnsi = class(TCustomControl)
private
{ Terminal buffer state }
FScreen: TList; { Active screen lines (FRows PTermLine ptrs) }
FScrollback: TList; { Scrollback history (up to FScrollbackSize) }
{ Cursor position (0-based row/col within the active screen) }
FCursorRow: Integer; { Current row (0 = top) }
FCursorCol: Integer; { Current column (0 = left) }
FSaveCurRow: Integer; { Saved row for SCP/RCP (ESC[s / ESC[u) }
FSaveCurCol: Integer; { Saved column for SCP/RCP }
{ Current text attributes (set by SGR escape sequences) }
FAttrFG: Integer; { Foreground color index 0-7 }
FAttrBG: Integer; { Background color index 0-7 }
FAttrBold: Boolean; { Bold: maps FG to bright (index + 8) }
FAttrBlink: Boolean; { Blink: cell toggles visibility on timer }
FAttrReverse: Boolean; { Reverse video: swap FG/BG at render time }
{ ANSI escape sequence parser state }
FParseState: TParseState; { Current parser state machine position }
FParamBuf: array[0..31] of Char; { CSI parameter digits/semicolons }
FParamLen: Integer; { Current length of FParamBuf }
FCSIParam1: Integer; { First CSI param, parsed inline during scan }
FCSIParam2: Integer; { Second CSI param, parsed inline during scan }
FCSIParamIdx: Integer; { Which param we're accumulating (0=P1, 1=P2) }
FMusicStr: string; { Accumulated ANSI music string (ESC[M..^N) }
{ Font metrics (measured from OEM charset paint font) }
FCellWidth: Integer; { Character cell width in pixels (typically 8) }
FCellHeight: Integer; { Character cell height in pixels (typ 12-16) }
{ Blink state }
FBlinkOn: Boolean; { Cursor blink phase: True=visible }
FLastBlinkTick: Longint; { GetTickCount value at last blink toggle }
{ Scrollback view }
FScrollPos: Integer; { Lines scrolled back (0=live, >0=viewing history) }
FPendingScrolls: Integer; { Scroll-up count pending for ScrollDC coalescing }
{ Terminal modes }
FWrapMode: Boolean; { Auto-wrap at right margin (DEC ?7h/l) }
{ Terminal dimensions }
FCols: Integer; { Number of columns (default 80) }
FRows: Integer; { Number of rows (default 25) }
FScrollbackSize: Integer; { Max scrollback lines to retain (default 500) }
{ Cursor visibility (DEC ?25h/l) }
FCursorVisible: Boolean; { True if cursor is shown }
FLastCursorRow: Integer; { Previous cursor row for ghost cleanup }
{ Events }
FOnKeyData: TKeyDataEvent; { Keyboard data callback (keys -> serial) }
{ Paint font }
FPaintFont: HFont; { GDI font handle for OEM_CHARSET rendering }
FStockFont: Boolean; { True if FPaintFont is a stock object (no delete) }
{ Dirty tracking: per-row flags for incremental rendering }
FDirtyRow: array[0..255] of Boolean; { True = row needs re-render }
FAllDirty: Boolean; { True = all rows need re-render }
FScrollbarDirty: Boolean; { True = scrollbar range/position needs update }
FLiveDC: HDC; { Non-zero during render pass in WriteDeferredBuf }
procedure AllocLine(Line: PTermLine);
procedure CMFontChanged(var Msg: TMessage); message cm_FontChanged;
procedure CreatePaintFont;
procedure DeleteChars(N: Integer);
procedure DeleteLines(N: Integer);
procedure DirtyBlinkRows;
procedure DoScrollDown;
procedure DoScrollUp;
procedure EraseDisplay(Mode: Integer);
procedure EraseLine(Mode: Integer);
procedure ExecuteCSI(FinalCh: Char);
procedure ExecuteMusic;
procedure FlushPendingScrolls;
procedure FreeLineList(List: TList);
procedure InsertChars(N: Integer);
procedure InsertLines(N: Integer);
procedure ParseDataBuf(Buf: PChar; Len: Integer);
procedure ParseSGR;
procedure ProcessChar(Ch: Char);
procedure RecalcCellSize;
procedure RenderRow(DC: HDC; Row: Integer);
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 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 Clear;
procedure Reset;
procedure FlipToScreen;
procedure TickBlink;
procedure Write(const S: string);
procedure WriteDeferred(const S: string);
procedure WriteDeferredBuf(Buf: PChar; Len: Integer);
property CursorCol: Integer read FCursorCol;
property CursorRow: Integer read FCursorRow;
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) }
);
{ Blink toggle interval in milliseconds (cursor + text blink). }
BlinkMs = 500;
{ OUT_RASTER_PRECIS may not be defined in Delphi 1.0 WinTypes }
OutRasterPrecis = 6;
{ ExtTextOut option flag (may not be in Delphi 1.0 WinTypes) }
ETO_OPAQUE = $0002;
{ 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 parameters from char buffer }
{ Zero-allocation: parses integers directly without Copy or StrToIntDef. }
{ ----------------------------------------------------------------------- }
procedure ParseParamBuf(Buf: PChar; Len: Integer;
var Params: array of Integer; var Count: Integer);
var
I: Integer;
Value: Integer;
InNum: Boolean;
begin
Count := 0;
Value := 0;
InNum := False;
for I := 0 to Len - 1 do
begin
if Buf[I] = ';' then
begin
if Count <= High(Params) then
begin
if InNum then
Params[Count] := Value
else
Params[Count] := 0;
Inc(Count);
end;
Value := 0;
InNum := False;
end
else if (Buf[I] >= '0') and (Buf[I] <= '9') then
begin
Value := Value * 10 + (Ord(Buf[I]) - Ord('0'));
InNum := True;
end;
end;
{ Last value after final semicolon (or entire buffer if no semicolons) }
if Count <= High(Params) then
begin
if InNum then
Params[Count] := Value
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 := 7;
Line^.Cells[I].BG := 0;
Line^.Cells[I].Bold := False;
Line^.Cells[I].Blink := False;
end;
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.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;
FAttrFG := 7;
FCellWidth := 8;
FCellHeight := 16;
FBlinkOn := True;
FLastBlinkTick := GetTickCount;
FWrapMode := True;
FAllDirty := True;
{ 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;
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 cached across GetDC/ReleaseDC calls, }
{ avoiding DC allocation overhead on each FlipToScreen render pass. }
Params.WindowClass.Style := Params.WindowClass.Style or cs_OwnDC;
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 := 7;
Line^.Cells[I].BG := 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 (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.DirtyBlinkRows;
{ Targeted dirty marking for blink toggle. Instead of DirtyAll (which }
{ forces a full 25-row re-render), only dirty the }
{ cursor row (cursor blink) and rows containing blink cells (text blink). }
{ Typical BBS content has 0-3 blink rows, so this reduces blink overhead }
{ from ~63ms to ~3ms on a 486. }
var
I: Integer;
J: Integer;
Line: PTermLine;
begin
{ In scrollback view, FlipToScreen sets FAllDirty anyway }
if FAllDirty or (FScrollPos <> 0) then
Exit;
{ Dirty cursor row for cursor blink }
if FCursorVisible and (FCursorRow >= 0) and (FCursorRow < FRows) then
FDirtyRow[FCursorRow] := True;
{ Dirty rows containing blink cells for text blink }
for I := 0 to FRows - 1 do
begin
if not FDirtyRow[I] and (I < FScreen.Count) then
begin
Line := FScreen[I];
for J := 0 to FCols - 1 do
begin
if Line^.Cells[J].Blink then
begin
FDirtyRow[I] := True;
Break;
end;
end;
end;
end;
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);
FAllDirty := True;
end;
procedure TKPAnsi.DoScrollUp;
var
Line: PTermLine;
begin
if FScreen.Count < FRows then
Exit;
{ Move top line to scrollback }
Line := FScreen[0];
FScrollback.Add(Line);
FScreen.Delete(0);
{ TrimScrollback deferred to ParseData for batching }
{ Add blank line at bottom }
GetMem(Line, SizeOf(TTermLineRec));
AllocLine(Line);
FScreen.Add(Line);
FScrollbarDirty := True;
{ Track pending scrolls for coalesced ScrollDC in FlipToScreen. }
{ Multiple scrolls during one ParseData call collapse into a single }
{ ScrollDC call, then only the newly exposed bottom rows are rendered.}
Inc(FPendingScrolls);
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 := 7;
Line^.Cells[J].BG := 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
AllocLine(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
AllocLine(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 := 7;
Line^.Cells[J].BG := 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;
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 := 7;
Line^.Cells[J].BG := 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 := 7;
Line^.Cells[J].BG := 0;
Line^.Cells[J].Bold := False;
Line^.Cells[J].Blink := False;
end;
end;
2: { Erase entire line }
AllocLine(Line);
end;
FDirtyRow[FCursorRow] := True;
end;
procedure TKPAnsi.ExecuteCSI(FinalCh: Char);
{ Uses FCSIParam1/FCSIParam2 parsed inline during CSI scan-ahead. }
{ No ParseParamBuf call needed -- saves ~200 cycles per CSI sequence. }
{ ParseSGR still uses FParamBuf for variable-count parameters. }
var
P1: Integer;
P2: Integer;
begin
P1 := FCSIParam1;
P2 := FCSIParam2;
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.FlushPendingScrolls;
var
ScrollR: TRect;
ClipR: TRect;
UpdateR: TRect;
Row: Integer;
GhostRow: Integer;
begin
if (FPendingScrolls = 0) or (FLiveDC = 0) then
Exit;
if FPendingScrolls >= FRows then
begin
FAllDirty := True;
FPendingScrolls := 0;
Exit;
end;
ScrollR.Left := 0;
ScrollR.Top := 0;
ScrollR.Right := FCols * FCellWidth;
ScrollR.Bottom := FRows * FCellHeight;
ClipR := ScrollR;
ScrollDC(FLiveDC, 0, -(FPendingScrolls * FCellHeight),
ScrollR, ClipR, 0, @UpdateR);
{ Mark exposed rows and cursor ghost row for deferred rendering }
for Row := FRows - FPendingScrolls to FRows - 1 do
FDirtyRow[Row] := True;
GhostRow := FLastCursorRow - FPendingScrolls;
if (GhostRow >= 0) and (GhostRow < FRows) then
FDirtyRow[GhostRow] := True;
FLastCursorRow := FCursorRow;
FPendingScrolls := 0;
end;
procedure TKPAnsi.FlipToScreen;
{ Render dirty rows via ExtTextOut directly to the screen DC. CS_OWNDC }
{ retains the selected font across GetDC calls, so no per-frame font }
{ selection overhead. Coalesced ScrollDC shifts on-screen pixels to match }
{ FScreen after scrolling, reducing the per-scroll cost from 25 rows to }
{ just the newly exposed rows. }
var
DC: HDC;
Row: Integer;
GhostRow: Integer;
HasDirty: Boolean;
ScrollR: TRect;
ClipR: TRect;
UpdateR: TRect;
begin
if not HandleAllocated then
Exit;
if FPaintFont = 0 then
RecalcCellSize;
if FPaintFont = 0 then
Exit;
{ Scrollback view: force full redraw (line mapping changes) }
if FScrollPos <> 0 then
begin
FAllDirty := True;
FPendingScrolls := 0;
end;
{ Deferred scrollbar update (batched from DoScrollUp) }
if FScrollbarDirty then
begin
UpdateScrollbar;
FScrollbarDirty := False;
end;
{ Coalesced ScrollDC: shift on-screen pixels to match FScreen after }
{ one or more DoScrollUp calls, then only render the newly exposed rows. }
if (FPendingScrolls > 0) and not FAllDirty then
begin
if FPendingScrolls < FRows then
begin
ScrollR.Left := 0;
ScrollR.Top := 0;
ScrollR.Right := FCols * FCellWidth;
ScrollR.Bottom := FRows * FCellHeight;
ClipR := ScrollR;
DC := GetDC(Handle);
ScrollDC(DC, 0, -(FPendingScrolls * FCellHeight),
ScrollR, ClipR, 0, @UpdateR);
ReleaseDC(Handle, DC);
{ Dirty the newly exposed bottom rows }
for Row := FRows - FPendingScrolls to FRows - 1 do
begin
if Row >= 0 then
FDirtyRow[Row] := True;
end;
{ Dirty row that now shows cursor ghost from pre-scroll pixels }
GhostRow := FCursorRow - FPendingScrolls;
if (GhostRow >= 0) and (GhostRow < FRows) then
FDirtyRow[GhostRow] := True;
{ Sync FLastCursorRow since pixel positions shifted }
FLastCursorRow := FCursorRow;
end
else
FAllDirty := True;
FPendingScrolls := 0;
end;
{ Dirty old cursor row to erase ghost when cursor moved between rows }
if FCursorRow <> FLastCursorRow then
begin
if (FLastCursorRow >= 0) and (FLastCursorRow <= 255) then
FDirtyRow[FLastCursorRow] := True;
if (FCursorRow >= 0) and (FCursorRow <= 255) then
FDirtyRow[FCursorRow] := True;
FLastCursorRow := FCursorRow;
end;
{ Early exit: skip GetDC/ReleaseDC when nothing needs rendering }
if not FAllDirty then
begin
HasDirty := False;
for Row := 0 to FRows - 1 do
begin
if FDirtyRow[Row] then
begin
HasDirty := True;
Break;
end;
end;
if not HasDirty then
Exit;
end;
{ Render dirty rows directly to screen DC. Re-select the OEM font each }
{ frame because Delphi's Canvas infrastructure can deselect it from the }
{ CS_OWNDC between paint cycles. }
DC := GetDC(Handle);
SelectObject(DC, FPaintFont);
SetBkMode(DC, OPAQUE);
for Row := 0 to FRows - 1 do
begin
if FAllDirty or FDirtyRow[Row] then
begin
RenderRow(DC, Row);
FDirtyRow[Row] := False;
end;
end;
FAllDirty := False;
ReleaseDC(Handle, DC);
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;
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 := 7;
Line^.Cells[I].BG := 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
DC: HDC;
Row: Integer;
begin
if FPaintFont = 0 then
RecalcCellSize;
if FPaintFont = 0 then
Exit;
{ Full repaint: render each row directly to screen }
FAllDirty := True;
DC := Canvas.Handle;
SelectObject(DC, FPaintFont);
SetBkMode(DC, OPAQUE);
for Row := 0 to FRows - 1 do
begin
RenderRow(DC, Row);
FDirtyRow[Row] := False;
end;
FAllDirty := False;
end;
procedure TKPAnsi.ParseDataBuf(Buf: PChar; Len: Integer);
{ Process incoming data from a PChar buffer (no string allocation needed). }
{ }
{ Three inlined fast paths eliminate ProcessChar method call overhead: }
{ 1. Printable text runs: batch fill cells, one color computation per run }
{ 2. CSI parameter accumulation: scan-ahead loop for digits/semicolons }
{ 3. Common control chars: ESC, CR, LF handled inline }
{ }
{ Uncommon states (psCSIQuestion, psMusic) and rare control chars (TAB, }
{ BS, BEL, ENQ) still delegate to ProcessChar. }
{ }
{ Does NOT call FlipToScreen -- the caller handles rendering. }
var
I: Integer;
Ch: Char;
Line: PTermLine;
FGIdx: Byte;
BGIdx: Byte;
RunEnd: Integer;
Remaining: Integer;
begin
Line := nil;
I := 0;
while I < Len do
begin
case FParseState of
psNormal:
begin
if Buf[I] >= ' ' then
begin
{ Fast path: batch printable characters }
if FCursorCol >= FCols then
begin
if FWrapMode then
begin
FCursorCol := 0;
Inc(FCursorRow);
if FCursorRow >= FRows then
begin
FCursorRow := FRows - 1;
DoScrollUp;
end;
Line := nil;
end
else
FCursorCol := FCols - 1;
end;
if Line = nil then
Line := FScreen[FCursorRow];
{ Compute colors once for the entire run }
if FAttrBold then
FGIdx := FAttrFG + 8
else
FGIdx := FAttrFG;
BGIdx := FAttrBG;
{ Find run end: stop at control char, end of input, or end of row }
Remaining := FCols - FCursorCol;
RunEnd := I;
while (RunEnd < Len) and (Buf[RunEnd] >= ' ') and
(RunEnd - I < Remaining) do
Inc(RunEnd);
{ Fill cells in tight loop }
if FAttrReverse then
begin
while I < RunEnd do
begin
Line^.Cells[FCursorCol].Ch := Buf[I];
Line^.Cells[FCursorCol].FG := BGIdx;
Line^.Cells[FCursorCol].BG := FGIdx;
Line^.Cells[FCursorCol].Bold := FAttrBold;
Line^.Cells[FCursorCol].Blink := FAttrBlink;
Inc(FCursorCol);
Inc(I);
end;
end
else
begin
while I < RunEnd do
begin
Line^.Cells[FCursorCol].Ch := Buf[I];
Line^.Cells[FCursorCol].FG := FGIdx;
Line^.Cells[FCursorCol].BG := BGIdx;
Line^.Cells[FCursorCol].Bold := FAttrBold;
Line^.Cells[FCursorCol].Blink := FAttrBlink;
Inc(FCursorCol);
Inc(I);
end;
end;
FDirtyRow[FCursorRow] := True;
end
else if Buf[I] = #27 then
begin
{ ESC: start escape sequence }
FParseState := psEscape;
Line := nil;
Inc(I);
end
else if Buf[I] = #10 then
begin
{ LF: line feed }
Inc(FCursorRow);
if FCursorRow >= FRows then
begin
FCursorRow := FRows - 1;
DoScrollUp;
end;
Line := nil;
Inc(I);
end
else if Buf[I] = #13 then
begin
{ CR: carriage return }
FCursorCol := 0;
Inc(I);
end
else
begin
{ Uncommon control chars: BS, TAB, BEL, ENQ }
Line := nil;
ProcessChar(Buf[I]);
Inc(I);
end;
end;
psEscape:
begin
if Buf[I] = '[' then
begin
FParamLen := 0;
FCSIParam1 := 0;
FCSIParam2 := 0;
FCSIParamIdx := 0;
FParseState := psCSI;
end
else
FParseState := psNormal;
Inc(I);
end;
psCSI:
begin
{ Scan ahead: parse integers inline while accumulating FParamBuf. }
{ FCSIParam1/FCSIParam2 are built digit-by-digit during the scan }
{ so ExecuteCSI can use them directly without ParseParamBuf. }
{ FParamBuf is still maintained for ParseSGR (variable param count). }
while (I < Len) and
((Buf[I] >= '0') and (Buf[I] <= '9') or (Buf[I] = ';')) do
begin
if Buf[I] = ';' then
begin
Inc(FCSIParamIdx);
end
else if FCSIParamIdx = 0 then
begin
FCSIParam1 := FCSIParam1 * 10 + (Ord(Buf[I]) - 48);
end
else if FCSIParamIdx = 1 then
begin
FCSIParam2 := FCSIParam2 * 10 + (Ord(Buf[I]) - 48);
end;
if FParamLen < 32 then
begin
FParamBuf[FParamLen] := Buf[I];
Inc(FParamLen);
end;
Inc(I);
end;
{ Process final command byte if available }
if I < Len then
begin
Ch := Buf[I];
if Ch = '?' then
begin
FParseState := psCSIQuestion;
end
else if (Ch = 'M') and (FParamLen = 0) then
begin
FMusicStr := '';
FParseState := psMusic;
end
else
begin
ExecuteCSI(Ch);
FParseState := psNormal;
end;
Inc(I);
end;
end;
else
begin
{ psCSIQuestion, psMusic: delegate to ProcessChar }
Line := nil;
ProcessChar(Buf[I]);
Inc(I);
end;
end;
end;
{ Deferred scrollback trim -- batched from DoScrollUp }
TrimScrollback;
{ Snap to bottom on new data }
if FScrollPos <> 0 then
begin
FScrollPos := 0;
FScrollbarDirty := True;
FAllDirty := True;
end;
end;
procedure TKPAnsi.ParseSGR;
var
Params: array[0..15] of Integer;
Count: Integer;
I: Integer;
Code: Integer;
begin
ParseParamBuf(@FParamBuf[0], FParamLen, 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 RenderRow -- 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 := BGIdx;
Line^.Cells[FCursorCol].BG := FGIdx;
end
else
begin
Line^.Cells[FCursorCol].FG := FGIdx;
Line^.Cells[FCursorCol].BG := 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
FParamLen := 0;
FCSIParam1 := 0;
FCSIParam2 := 0;
FCSIParamIdx := 0;
FParseState := psCSI;
end;
else
begin
{ Unrecognized escape sequence, return to normal }
FParseState := psNormal;
end;
end;
end;
psCSI:
begin
case Ch of
'0'..'9', ';':
begin
if Ch = ';' then
Inc(FCSIParamIdx)
else if FCSIParamIdx = 0 then
FCSIParam1 := FCSIParam1 * 10 + (Ord(Ch) - 48)
else if FCSIParamIdx = 1 then
FCSIParam2 := FCSIParam2 * 10 + (Ord(Ch) - 48);
if FParamLen < 32 then
begin
FParamBuf[FParamLen] := Ch;
Inc(FParamLen);
end;
end;
'?':
begin
FParseState := psCSIQuestion;
end;
'M':
begin
{ Check if this is ANSI music: ESC[M starts music mode }
if FParamLen = 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', ';':
begin
if FParamLen < 32 then
begin
FParamBuf[FParamLen] := Ch;
Inc(FParamLen);
end;
end;
'h': { Set Mode }
begin
if (FParamLen = 1) and (FParamBuf[0] = '7') then
FWrapMode := True
else if (FParamLen = 2) and (FParamBuf[0] = '2') and (FParamBuf[1] = '5') then
FCursorVisible := True;
FParseState := psNormal;
end;
'l': { Reset Mode }
begin
if (FParamLen = 1) and (FParamBuf[0] = '7') then
FWrapMode := False
else if (FParamLen = 2) and (FParamBuf[0] = '2') and (FParamBuf[1] = '5') 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 cell size and configure the CS_OWNDC. The font and }
{ background mode persist across GetDC/ReleaseDC with CS_OWNDC, so this }
{ is effectively a one-time setup per font change. }
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;
if FCellHeight > 32 then
FCellHeight := 32;
{ Resize control to fit terminal dimensions }
Width := FCols * FCellWidth + GetSystemMetrics(sm_CxVScroll);
Height := FRows * FCellHeight;
FAllDirty := True;
Invalidate;
end;
procedure TKPAnsi.RenderRow(DC: HDC; Row: Integer);
{ Render one terminal row via ExtTextOut directly to the screen DC. }
{ Scans cells for color runs (consecutive cells with same effective FG+BG) }
{ and emits one ExtTextOut call per run. No intermediate bitmap -- the }
{ display driver renders text directly into the framebuffer. }
var
Line: PTermLine;
Col: Integer;
CurCol: Integer;
FGIdx: Byte;
BGIdx: Byte;
TmpIdx: Byte;
SbkCount: Integer;
VisRow: Integer;
RunStart: Integer;
RunFG: Byte;
RunBG: Byte;
RunBuf: array[0..255] of Char;
RunLen: Integer;
R: TRect;
RowY: Integer;
begin
RowY := Row * FCellHeight;
{ Determine which line to render (handles scrollback view) }
if FScrollPos <> 0 then
begin
SbkCount := FScrollback.Count;
VisRow := Row - FScrollPos;
if VisRow < 0 then
begin
if (SbkCount + VisRow >= 0) then
Line := FScrollback[SbkCount + VisRow]
else
Line := nil;
end
else if VisRow < FScreen.Count then
Line := FScreen[VisRow]
else
Line := nil;
end
else if Row < FScreen.Count then
Line := FScreen[Row]
else
Line := nil;
if Line = nil then
begin
{ Blank row: fill with black background }
SetBkColor(DC, AnsiColors[0]);
R.Left := 0;
R.Top := RowY;
R.Right := FCols * FCellWidth;
R.Bottom := RowY + FCellHeight;
ExtTextOut(DC, 0, RowY, ETO_OPAQUE, @R, nil, 0, nil);
Exit;
end;
{ Determine cursor column for this row (-1 if no cursor) }
if FCursorVisible and FBlinkOn and (FScrollPos = 0) and
(Row = FCursorRow) and (FCursorCol >= 0) and (FCursorCol < FCols) then
CurCol := FCursorCol
else
CurCol := -1;
RunStart := 0;
RunLen := 0;
RunFG := 255;
RunBG := 255;
for Col := 0 to FCols - 1 do
begin
{ Determine effective colors }
if Line^.Cells[Col].Blink and not FBlinkOn then
FGIdx := Line^.Cells[Col].BG
else
FGIdx := Line^.Cells[Col].FG;
BGIdx := Line^.Cells[Col].BG;
{ Cursor: swap FG/BG }
if Col = CurCol then
begin
TmpIdx := FGIdx;
FGIdx := BGIdx;
BGIdx := TmpIdx;
end;
{ If colors changed, flush current run }
if (FGIdx <> RunFG) or (BGIdx <> RunBG) then
begin
if RunLen > 0 then
begin
SetTextColor(DC, AnsiColors[RunFG]);
SetBkColor(DC, AnsiColors[RunBG]);
R.Left := RunStart * FCellWidth;
R.Top := RowY;
R.Right := (RunStart + RunLen) * FCellWidth;
R.Bottom := RowY + FCellHeight;
ExtTextOut(DC, RunStart * FCellWidth, RowY, ETO_OPAQUE, @R,
@RunBuf[0], RunLen, nil);
end;
RunStart := Col;
RunLen := 0;
RunFG := FGIdx;
RunBG := BGIdx;
end;
RunBuf[RunLen] := Line^.Cells[Col].Ch;
Inc(RunLen);
end;
{ Flush final run }
if RunLen > 0 then
begin
SetTextColor(DC, AnsiColors[RunFG]);
SetBkColor(DC, AnsiColors[RunBG]);
R.Left := RunStart * FCellWidth;
R.Top := RowY;
R.Right := (RunStart + RunLen) * FCellWidth;
R.Bottom := RowY + FCellHeight;
ExtTextOut(DC, RunStart * FCellWidth, RowY, ETO_OPAQUE, @R,
@RunBuf[0], RunLen, nil);
end;
end;
procedure TKPAnsi.Reset;
begin
FAttrFG := 7;
FAttrBG := 0;
FAttrBold := False;
FAttrBlink := False;
FAttrReverse := False;
FParseState := psNormal;
FParamLen := 0;
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;
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;
{ Batch-optimized: free excess items, shift remainder down in one pass, }
{ then shrink from the end. O(n) total vs O(k*n) for k front-deletions. }
var
Excess: Integer;
I: Integer;
Line: PTermLine;
begin
Excess := FScrollback.Count - FScrollbackSize;
if Excess <= 0 then
Exit;
{ Free the oldest lines }
for I := 0 to Excess - 1 do
begin
Line := FScrollback[I];
FreeMem(Line, SizeOf(TTermLineRec));
end;
{ Shift remaining items down in one pass }
for I := 0 to FScrollback.Count - Excess - 1 do
FScrollback[I] := FScrollback[I + Excess];
{ Remove excess slots from the end (O(1) per deletion) }
for I := 1 to Excess do
FScrollback.Delete(FScrollback.Count - 1);
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 -- ExtTextOut ETO_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.TickBlink;
var
Now: Longint;
begin
Now := GetTickCount;
if Now - FLastBlinkTick >= BlinkMs then
begin
FLastBlinkTick := Now;
FBlinkOn := not FBlinkOn;
DirtyBlinkRows;
end;
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
begin
WriteDeferredBuf(@S[1], Length(S));
FlipToScreen;
end;
end;
procedure TKPAnsi.WriteDeferred(const S: string);
begin
if Length(S) > 0 then
WriteDeferredBuf(@S[1], Length(S));
end;
procedure TKPAnsi.WriteDeferredBuf(Buf: PChar; Len: Integer);
var
Row: Integer;
begin
if Len <= 0 then
Exit;
{ Parse into cell buffer -- pure CPU, no GDI calls }
ParseDataBuf(Buf, Len);
{ Render pass: flush coalesced scrolls, then redraw dirty rows }
if HandleAllocated and (FPaintFont <> 0) and (FScrollPos = 0) then
begin
FLiveDC := GetDC(Handle);
SelectObject(FLiveDC, FPaintFont);
SetBkMode(FLiveDC, OPAQUE);
FlushPendingScrolls;
{ Dirty old cursor row to erase ghost when cursor moved between rows }
if FCursorRow <> FLastCursorRow then
begin
if (FLastCursorRow >= 0) and (FLastCursorRow < FRows) then
FDirtyRow[FLastCursorRow] := True;
FDirtyRow[FCursorRow] := True;
end;
for Row := 0 to FRows - 1 do
begin
if FAllDirty or FDirtyRow[Row] then
begin
RenderRow(FLiveDC, Row);
FDirtyRow[Row] := False;
end;
end;
FAllDirty := False;
FLastCursorRow := FCursorRow;
ReleaseDC(Handle, FLiveDC);
FLiveDC := 0;
end;
end;
{ ----------------------------------------------------------------------- }
{ Component registration }
{ ----------------------------------------------------------------------- }
procedure Register;
begin
RegisterComponents('KP', [TKPAnsi]);
end;
end.
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