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33 lines
1.0 KiB
Racket
33 lines
1.0 KiB
Racket
8 years ago
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#lang fontkit/racket
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(require restructure)
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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 (make-object 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 (+DecodeStream (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? (hash-ref (send cvt decode ds) 'controlValues) cvt-array)
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(define es (+EncodeStream))
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(send cvt encode es (mhash 'controlValues cvt-array))
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(check-equal? (send es dump) table-bytes)
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)
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