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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/head.js
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|#
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(define-subclass RStruct (Rhead))
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(define head (make-object Rhead
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(dictify
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'version int32be ;; 0x00010000 (version 1.0)
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'revision int32be ;; set by font manufacturer
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'checkSumAdjustment uint32be
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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 (make-object RArray int32be 2)
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'modified (make-object RArray int32be 2)
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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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'yMax int16be ;; for all glyph bounding boxes
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'macStyle (make-object RBitfield uint16be '(bold italic underline outline shadow condensed extended))
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'lowestRecPPEM uint16be ;; smallest readable size in pixels
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'fontDirectionHint int16be
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'indexToLocFormat int16be ;; 0 for short offsets 1 for long
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'glyphDataFormat int16be ;; 0 for current format
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)))
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(test-module
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(require "directory.rkt")
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(define ip (open-input-file charter-path))
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(define dir (directory-decode ip))
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(define offset (· dir tables head offset))
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(define length (· dir tables head length))
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(check-equal? offset 236)
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(check-equal? length 54)
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(define table-bytes #"\0\1\0\0\0\2\0\0@\247\22 _\17<\365\0\t\3\350\0\0\0\0\316\3\301?\0\0\0\0\316\3\304\363\377_\377\24\4\251\3\303\0\0\0\t\0\2\0\0\0\0")
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(set-port-position! ip 0)
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(check-equal? (peek-bytes length offset ip) table-bytes)
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(define table-data (send head decode (make-object RDecodeStream table-bytes)))
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(check-equal? (· table-data unitsPerEm) 1000)
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(check-equal? (· table-data yMin) -236)
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(check-equal? (· table-data yMax) 963)
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(check-equal? (· table-data xMax) 1193)
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(check-equal? (· table-data xMin) -161)
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(check-equal? (· table-data macStyle) (make-hash '((shadow . #f)
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(extended . #f)
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(condensed . #f)
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(underline . #f)
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(outline . #f)
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(bold . #f)
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(italic . #f))))
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(check-equal? (· table-data magicNumber) #x5F0F3CF5))
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