font-with-tab-width ( font width/f -- font' )
Font shaping options

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Vocabulary
fonts.shaping

Inputs

font	a font
width/f	a positive distance in logical pixels, or f

Outputs

font'

a new font

Word description
Sets a uniform tab-stop interval. A false value restores the backend default. DirectWrite and Uniscribe support this option. Uniscribe rounds the scaled interval to whole device pixels, with a minimum of one pixel.

Definition

USING: fonts.shaping.private kernel math ;

IN: fonts.shaping

: font-with-tab-width ( font width/f -- font' )
    dup [
        dup real? [ dup [ 0 > ] [ 1/0. < ] bi and ] [ f ] if
        [ invalid-tab-width ] unless
    ] when "tab-width" swap font-with-option ;