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30 lines
999 B
Racket
30 lines
999 B
Racket
#lang fontkit/racket
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(require xenomorph)
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(provide (all-defined-out))
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#|
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approximates
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https://github.com/mbutterick/fontkit/blob/master/src/tables/cvt.js
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|#
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(define-subclass Struct (Rcvt_))
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(define cvt_ (+Rcvt_
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(dictify
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'controlValues (+Array int16be))))
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(test-module
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(define ip (open-input-file charter-path))
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(define dir (deserialize (read (open-input-file charter-directory-path))))
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(define offset (· dir tables cvt_ offset))
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(define len (· dir tables cvt_ length))
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(check-equal? offset 4592)
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(check-equal? len 26)
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(set-port-position! ip 0)
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(define table-bytes #"\0\24\0+\0S\0\0\0\20\377&\0\0\1\341\0\v\2\237\0\22\2\340\0\b")
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(check-equal? table-bytes (peek-bytes len offset ip))
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(define ds (open-input-bytes (peek-bytes len offset ip)))
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(define cvt-array '(20 43 83 0 16 -218 0 481 11 671 18 736 8))
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(check-equal? (dict-ref (decode cvt_ ds) 'controlValues) cvt-array)
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(check-equal? (encode cvt_ (mhash 'controlValues cvt-array) #f) table-bytes))
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