Disabling anti-aliasing in Image Canvas,

[cov]

I'm trying to transfer text rendered onto a Tbitmap canvas onto another image canvas, but I cannot get rid of the anti aliasing.

This is the image file created (attached), which is unusable:

Reducing the image.PixelFormat:=pf1bit and specifying Image.Monochrome as True gives me an error message.

Runerror (204), invalid pointer operation in the file dynarr.inc at line 129.

Is there a way to disable text antialiasing?

[wp]

You mean you want to remove the extra anti-aliasing pixels from an existing bitmap? I think that's not possible (at least not easily).

[cov]

No.

The image is just to show the anti aliasing.

Code: Pascal  [Select][+][-]

1.       bmp:= TBitmap.Create;
2.       bmp.Canvas.TextOut(0,2,'1.789 m³/Hr WATER');        

I want to transfer the image onto the screen pixel by pixel. This is so that I can add additional information related to the text behind each pixel. I hope this makes sense. I'm aware that I could simply Bitblock copy the canvas to the screen, but I'm planning to map each pixel to an array with more information.

The image was simply generated by using bmp.SaveToFile('/tmp/image.bmp') to illustrate what I meant.

[jamie]

Code: Pascal  [Select][+][-]

1. bmp.Canvas.Font.quality := fqnonAntialiased
2.  

jamie

[cov]

Thanks.

Unfortunately it doesn't work.

Code: Pascal  [Select][+][-]

1. bmp.Canvas.Font.Quality:=fqNonAntialiased;
2. bmp.Canvas.Brush.Style := bsSolid;
3. bmp.Canvas.Brush.Color := clWhite;
4. bmp.Canvas.FillRect(0,0,txtWidth,txtHgt);
5. bmp.Canvas.TextOut(0,2,'1.789 m³/Hr WATER');                              

[cov]

OK, thanks everyone.

According to this, GTK2 does not support fqNonAntialiased.

An alternative work around is suggested.

[wp]

Mentioning nonAntialiased font quality gives the impression that you want to draw text in a non-antialiased way? In this case, simply paint to a monochrome bitmap like in the attached demo project.