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unitcontrolscreenbitmap.pas
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unitcontrolscreenbitmap.pas
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unit UnitControlScreenBitmap;
// Copyright 2022-2024 Zoran Vučenović
// SPDX-License-Identifier: Apache-2.0
{$mode ObjFPC}{$H+}
{$i zxinc.inc}
interface
uses
Classes, SysUtils, BGRABitmapTypes, BGRABitmap, Controls, Graphics, ExtCtrls,
UnitSpectrumColoursBGRA;
type
TFlashTimer = class(TTimer)
public
FlashState: Boolean;
constructor Create(AOwner: TComponent); override;
end;
TControlScreenBitmap = class(TGraphicControl)
strict private
SpectrumColoursBGRA: TSpectrumColoursBGRA;
PScreenStart: PByte;
BmpFlash: TBGRABitmap;
FTimer: TFlashTimer;
procedure DrawToBgraBitmap;
public
constructor Create(AOwner: TComponent); override;
constructor CreateNewControl(AOwner: TComponent;
const ABGRAColours: TBGRAColours; const APScreenStart: PByte);
destructor Destroy; override;
procedure Paint; override;
property Timer: TFlashTimer write FTimer;
end;
implementation
{ TFlashTimer }
constructor TFlashTimer.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
Enabled := False;
Interval := 320;
FlashState := False;
end;
{ TControlScreenBitmap }
procedure TControlScreenBitmap.DrawToBgraBitmap;
var
M, N, I, J, X, Y: Integer;
ScreenPixel, Spx: PBGRAPixel;
CInk, CPaper: TBGRAPixel;
By, BAttr: Byte;
HasFlashAttr, Bright, LastPass: Boolean;
W: Word;
WRAdr: WordRec absolute W;
begin
for Y := 0 to 23 do begin
for X := 0 to 31 do begin
WRAdr.Lo := ((Y shl 5) or X) and $FF;
WRAdr.Hi := (Y shr 3) or 24;
BAttr := (PScreenStart + W)^;
WRAdr.Hi := Y and 24;
Bright := BAttr and %01000000 <> 0;
HasFlashAttr := BAttr and %10000000 <> 0;
if HasFlashAttr and (BmpFlash = nil) then begin
BmpFlash := TBGRABitmap.Create(ClientWidth, ClientHeight);
for J := 0 to Y * 8 - 1 do
Move(SpectrumColoursBGRA.Bmp.ScanLine[J]^, BmpFlash.ScanLine[J]^, 8 * 32 * SizeOf(TBGRAPixel));
if X > 0 then
for J := Y * 8 to Y * 8 + 7 do
Move(SpectrumColoursBGRA.Bmp.ScanLine[J]^, BmpFlash.ScanLine[J]^, 8 * SizeOf(TBGRAPixel) * X);
end;
CPaper := SpectrumColoursBGRA.BGRAColours[Bright, (BAttr shr 3) and %111];
CInk := SpectrumColoursBGRA.BGRAColours[Bright, BAttr and %111];
N := X shl 3;
for J := 0 to 7 do begin
M := (Y shl 3) or J;
ScreenPixel := SpectrumColoursBGRA.Bmp.ScanLine[M] + N;
By := (PScreenStart + W)^;
Spx := ScreenPixel;
LastPass := BmpFlash = nil;
repeat
I := 7;
repeat
if By and (1 shl I) <> 0 then begin
Spx^ := CInk;
end else begin
Spx^ := CPaper;
end;
if I = 0 then
Break;
Inc(Spx);
Dec(I);
until False;
if not HasFlashAttr then begin
if Assigned(BmpFlash) then
Move(ScreenPixel^, (BmpFlash.ScanLine[M] + N)^, 8 * SizeOf(TBGRAPixel));
Break;
end;
if LastPass then
Break;
LastPass := True;
Spx := BmpFlash.ScanLine[M] + N;
By := not By;
until False;
Inc(WRAdr.Hi);
end;
end;
end;
SpectrumColoursBGRA.Bmp.InvalidateBitmap;
if Assigned(BmpFlash) then
BmpFlash.InvalidateBitmap;
end;
constructor TControlScreenBitmap.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FTimer := nil;
BmpFlash := nil;
PScreenStart := nil;
Self.ClientWidth := 32 * 8;
Self.ClientHeight := 24 * 8;
end;
constructor TControlScreenBitmap.CreateNewControl(AOwner: TComponent;
const ABGRAColours: TBGRAColours; const APScreenStart: PByte);
begin
Create(AOwner);
SpectrumColoursBGRA.BGRAColours := ABGRAColours;
PScreenStart := APScreenStart;
end;
destructor TControlScreenBitmap.Destroy;
begin
BmpFlash.Free;
inherited Destroy;
end;
procedure TControlScreenBitmap.Paint;
var
Bmp: TBGRABitmap;
begin
inherited Paint;
if SpectrumColoursBGRA.Bmp.Width = 0 then begin
if Assigned(PScreenStart) then begin
SpectrumColoursBGRA.Bmp.SetSize(ClientWidth, ClientHeight);
DrawToBgraBitmap();
end;
end;
if Assigned(BmpFlash) and Assigned(FTimer) and FTimer.FlashState then
Bmp := BmpFlash
else
Bmp := SpectrumColoursBGRA.Bmp;
Bmp.Draw(Canvas, 0, 0, True);
end;
end.