基本的にはTAttTextを参照。

Text font code = 10*fontnumber + precision

The precision can be:

precision = 0 fast hardware fonts (steps in the size)
precision = 1 scalable and rotatable hardware fonts (see below)
precision = 2 scalable and rotatable hardware fonts
precision = 3 scalable and rotatable hardware fonts. Text size is given in pixels.

precision=1,2はTPadに対する相対的な大きさでサイズをスケールさせるらしい。
precision=3ではpixel指定。

Font number         X11 Names             Win32/TTF Names
  1 :       times-medium-i-normal      "Times New Roman"
  2 :       times-bold-r-normal        "Times New Roman"
  3 :       times-bold-i-normal        "Times New Roman"
  4 :       helvetica-medium-r-normal  "Arial"
  5 :       helvetica-medium-o-normal  "Arial"
  6 :       helvetica-bold-r-normal    "Arial"
  7 :       helvetica-bold-o-normal    "Arial"
  8 :       courier-medium-r-normal    "Courier New"
  9 :       courier-medium-o-normal    "Courier New"
 10 :       courier-bold-r-normal      "Courier New"
 11 :       courier-bold-o-normal      "Courier New"
 12 :       symbol-medium-r-normal     "Symbol"
 13 :       times-medium-r-normal      "Times New Roman"
 14 :                                  "Wingdings"
 15 :       Symbol italic (derived from Symbol)
 

13:Times, 2:Times bold, 4:Helvetica, 6:Helvetica bold あたりを使っておけば良い？