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@ -1,5 +1,6 @@
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#lang racket/base
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(require xenomorph)
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#lang debug racket/base
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(require xenomorph
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racket/date)
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(provide head)
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#|
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@ -7,6 +8,17 @@ approximates
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https://github.com/mbutterick/fontkit/blob/master/src/tables/head.js
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|#
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; `name` table dates are seconds since 1/1/1904 (Mac file convention)
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; whereas Racket / posix tracks since 1/1/1970
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; so we adjust with the difference in seconds
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(define mac-to-posix-delta 2082844800)
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(define hfs-seconds (x:int #:size 8
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#:signed #f
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#:endian 'be
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#:post-decode (λ (int) (seconds->date (- int mac-to-posix-delta)))
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#:pre-encode (λ (dt) (+ (date->seconds dt) mac-to-posix-delta))))
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(define head (x:struct
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'version int32be ;; 0x00010000 (version 1.0)
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'revision int32be ;; set by font manufacturer
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@ -14,8 +26,8 @@ https://github.com/mbutterick/fontkit/blob/master/src/tables/head.js
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'magicNumber uint32be ;; set to 0x5F0F3CF5
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'flags uint16be
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'unitsPerEm uint16be ;; range from 64 to 16384
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'created (x:array #:type int32be #:length 2)
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'modified (x:array #:type int32be #:length 2)
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'created hfs-seconds
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'modified hfs-seconds
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'xMin int16be ;; for all glyph bounding boxes
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'yMin int16be ;; for all glyph bounding boxes
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'xMax int16be ;; for all glyph bounding boxes
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