fonts - How to get the height of the emacs mode line? -

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actually, want generate xpm-format image , draw on mode line using display attribute of text string. however, height of mode line turns different result of different fontset.

that means need know height of emacs mode line , use generate corresponding size of xpm-format image, generated image can fill mode line totally.

my question showing title, how can know (finally rendered) height of mode line after applying specific fontset?

i have searched emacs documentation via apropos, found is:
can use font-info function font height in current frame. guess maybe can want based on this, although unlucky until now.

and, cannot find function related mode line height.

try

(- (elt (window-pixel-edges) 3)     (elt (window-inside-pixel-edges) 3))

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