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70 lines
2.5 KiB
Racket
70 lines
2.5 KiB
Racket
#lang debug racket/base
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(require racket/class racket/match racket/list xenomorph "cff-top.rkt")
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(provide (rename-out (CFFFont CFF_)))
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#|
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approximates
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https://github.com/mbutterick/fontkit/blob/master/src/cff/CFFFont.js
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|#
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;; the CFFFont object acts as the decoder for the `CFF ` table.
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;; so it should return a hash.
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(define CFFFont%
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(class x:base%
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(super-new)
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(augride [@decode decode])
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(define (@decode stream parent)
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(define cff-font (make-hasheq))
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(hash-set! cff-font 'stream stream)
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(for ([(k v) (in-hash (decode CFFTop stream))])
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(hash-set! cff-font k v))
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;; because fontkit depends on overloading 'version key, and we don't
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(hash-set! cff-font 'version (hash-ref cff-font 'x:version))
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(when (and (hash-has-key? cff-font 'version) (< (hash-ref cff-font 'version) 2))
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(match (hash-ref cff-font 'topDictIndex)
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[(list dict) (hash-set! cff-font 'topDict dict)]
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[_ (error 'only-single-font-allowed-in-cff)]))
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(hash-set! cff-font 'isCIDFont (hash-ref (hash-ref cff-font 'topDict) 'ROS))
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cff-font)))
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(define CFFFont (make-object CFFFont%))
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(module+ test
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(require rackunit racket/serialize racket/stream fontland/helper)
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(define dir (deserialize (read (open-input-file fira-otf-directory-path))))
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(define cff (hash-ref (hash-ref dir 'tables) 'CFF_))
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(define cff-offset (hash-ref cff 'offset))
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(check-equal? cff-offset 33472)
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(define cff-length (hash-ref cff 'length))
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(check-equal? cff-length 164604)
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(define ip (open-input-file fira-otf-path))
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(define cff-bytes (peek-bytes cff-length cff-offset ip))
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(define cff-font (decode CFFFont cff-bytes))
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(check-equal? (hash-ref cff-font 'version) 1)
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(check-equal? (hash-ref cff-font 'hdrSize) 4)
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(check-equal? (hash-ref cff-font 'offSize) 3)
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(check-equal? (hash-ref cff-font 'nameIndex) '("FiraSans-Book"))
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(check-equal? (length (hash-ref cff-font 'globalSubrIndex)) 820)
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(check-equal? (length (hash-ref cff-font 'stringIndex)) 2404)
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; 'version string
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(check-equal? (hash-ref (hash-ref cff-font 'topDict) 'version) 2401)
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(check-equal?
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(list-ref (hash-ref cff-font 'stringIndex) 2401)
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"004.106")
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; 'Notice string
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(check-equal?
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(list-ref (hash-ref cff-font 'stringIndex) 2402)
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"Digitized data copyright \\(c\\) 2012-2015, The Mozilla Foundation and Telefonica S.A.")
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; 'FullName string
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(check-equal?
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(list-ref (hash-ref cff-font 'stringIndex) 2403)
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"Fira Sans Book")
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(hash-ref (hash-ref cff-font 'topDict) 'Copyright)) |