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28 lines
912 B
Racket
28 lines
912 B
Racket
#lang debug racket/base
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(require racket/match
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fontland)
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(provide (all-defined-out))
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(define get-font
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(let ([font-cache (make-hasheqv)])
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(λ (font-path)
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(hash-ref! font-cache font-path (λ () (open-font font-path))))))
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(define get-gid
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(let ([gid-cache (make-hash)])
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(λ (font-path c-or-str)
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;; layout a string with just c in it and get the gid
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(define f (get-font font-path))
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(define str (match c-or-str
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[(? char? c) (string c)]
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[str #:when (eq? (string-length str) 1) str]
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[val (raise-argument-error 'get-gid "char or string of length 1" val)]))
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(define gid-key (cons str font-path))
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(hash-ref! gid-cache gid-key
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(λ () (glyph-id (vector-ref (glyphrun-glyphs (layout f str)) 0)))))))
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(define (char-in-font? font-path c-or-str)
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(not (zero? (get-gid font-path c-or-str))))
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