EasyLazFreeType - what does TextWidth() return?

[Graeme]

I somehow need to find out the width of a text string. I can't link to LCL or generate a FPCanvas bitmap. I only have access to the TTF files.

In the LazUtils there is a easylazfreetype.pas unit, and I'm trying to figure out the works of the TFreeTypeFont.TextWidth() method.

Using the following program I get two results of 8 and 23  - but what do those values represent? Points, Pixels?

If the result is in pixels, where do you specify the Font Size? I never specified a font point size in my example code, and obvious different font sizes will produce different pixel sizes for text width.

Code: Pascal  [Select][+][-]

1. program project1;
2.  
3. {$mode objfpc}{$h+}
4.  
5. uses
6.   Classes,
7.   SysUtils,
8.   EasyLazFreeType,
9.   LazFreeTypeFontCollection;
10.  
11. var
12.   s: string;
13.   fc: TFreeTypeFontCollection;
14.   lTTF: TFreeTypeFont;
15. begin
16.   s := 'abc';
17.  
18.   fc := TFreeTypeFontCollection.Create;
19.   if not fc.AddFile('/data/devel/Wisa/fpcpackages/fppdf/tests/fonts/DejaVuSans.ttf') then
20.     writeln('Failed to load font');
21.  
22.   lTTF := fc.Family['DejaVu Sans'].Font[0].CreateFont;
23.   // returns 8
24.   writeln(Trunc(lTTF.TextWidth('$')));
25.   // returns 23
26.   writeln(Trunc(lTTF.TextWidth('abc')));
27.  
28.  
29.   lTTF.Free;
30.   fc.Free;
31. end.
32.  

[FTurtle]

If the result is in pixels, where do you specify the Font Size? I never specified a font point size in my example code, and obvious different font sizes will produce different pixel sizes for text width.

I think should be some default value.
Why not specify your own value?

[Graeme]

Thanks FTurtle. Only afterwards I delved into the code and noticed that the constructor sets a default PointSize of 10, and that there is an actually PointSize and PixelSize property.