Can every glyph cell be of a different height in a font ?

FontCreator - Font Editor FontCreator - Discussion
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  1. Truetype fonts are scalable, they will occupy as many pixels as they need to suit the size selected in your word-processor. The number of funits in Font Creator is scaled to produce different numbers of pixels on a monitor — how many depends on the point size, the em-square, and the monitor’s resolution.

  2. See “How Do I Move the Black Lines?” in the FAQ thread.
    Line Spacing.png
    Each font illustrated above has a different design height, or em-square. That is, in a word-processor, when the font size is set at 10 points, and the line-spacing is set to single (the default), the distance between the baselines of two lines is different.

Arial’s spacing is 11.5 pts, that for Embassy BT is 12.5, but the spacing for Arial Black is 14.2 pts, or 142% of the point size. The amount of space is determined by the spacing between the two black horizontal lines — the WinAscent and WinDescent — and must be fixed for any font, but it can vary for different fonts.