How to turn off Antialiasing at TCanvas.TextOut()?

[gasensor]

How to turn off Antialiasing at TCanvas.TextOut()?

I tried:

Code: Pascal  [Select][+][-]

1. xxx := TCustomBitmap.Create();
2. xxx.Canvas.Font.Quality:= fqDraft;
3. xxx.Canvas.AntialiasingMode:=amOff;  

None of them worked. It can only be turned off in the operating system.

Lazarus: 4.0.0RC1/3.4.0
FPC: 3.2.2
OS: Linux MX 23.3 (x86_64)

[paweld]

Font.Quality

Code: Pascal  [Select][+][-]

1. procedure TForm1.Button1Click(Sender: TObject);
2. var
3.   bmp: TBitmap;
4. begin
5.   bmp := TBitmap.Create;
6.   bmp.SetSize(100, 100);
7.   bmp.Canvas.Font.Size := 32;
8.   bmp.Canvas.Font.Quality := fqNonAntialiased;
9.   bmp.Canvas.TextOut(1, 0, 'T3$t');
10.   Canvas.CopyRect(Rect(100, 100, 200, 200), bmp.Canvas, Rect(0, 0, 100, 100));
11.   bmp.Free;
12. end;  
13.  

[gasensor]

@paweld TKS
I tested it in detail and it didn't work. Attached is a screenshot of my test. Enlarge the output image and you will see that Antialias still works.

The Antialias technology is called ClearType on the win platform and is a sub-pixel rendering technology. But in my application, this technique can cause problems instead.

Test Code:

Code: Pascal  [Select][+][-]

1. procedure TForm1.Button1Click(Sender: TObject);
2. var
3.   bmp: TBitmap;
4. begin
5.   //Init
6.   bmp := TBitmap.Create;
7.   bmp.SetSize(40, 20);
8.   //Clear
9.   bmp.Canvas.Brush.Color:=clWhite;
10.   bmp.Canvas.FillRect(0,0,40,20);
11.   //Font setting
12.   bmp.Canvas.Font.Size := 12;
13.   bmp.Canvas.Font.Quality := fqNonAntialiased;
14.   //Draw Text
15.   bmp.Canvas.TextOut(0, 0, 'T3$t');
16.   //Enlarge
17.   Canvas.CopyRect(Rect(0, 0, 400, 200), bmp.Canvas, Rect(0, 0, 40, 20));
18.   //Raw
19.   Canvas.CopyRect(Rect(0, 200, 40, 220), bmp.Canvas, Rect(0, 0, 40, 20));
20.   bmp.Free;
21. end;
22.  

[paweld]

Hi,

I'll admit that I only checked on Windows, and it works there. On Linux, on the other hand, there is indeed a problem, and from what I found on the Internet it is a system setting that fonts have anti-aliasing enabled, and only you can turn it off in the fonts.config file (preferably in the user configuration) depending on the font name and/or size or other parameters - : https://wiki.archlinux.org/title/Font_configuration/Examples/No_anti-aliasing   

Important: this applies to the whole system