|
|
|
|
#lang fontkit/racket
|
|
|
|
|
(require xenomorph)
|
|
|
|
|
(provide (all-defined-out))
|
|
|
|
|
|
|
|
|
|
#|
|
|
|
|
|
approximates
|
|
|
|
|
https://github.com/mbutterick/fontkit/blob/master/src/tables/head.js
|
|
|
|
|
|#
|
|
|
|
|
|
|
|
|
|
(define-subclass Struct (Rhead))
|
|
|
|
|
|
|
|
|
|
(define head (make-object Rhead
|
|
|
|
|
(dictify
|
|
|
|
|
'version int32be ;; 0x00010000 (version 1.0)
|
|
|
|
|
'revision int32be ;; set by font manufacturer
|
|
|
|
|
'checkSumAdjustment uint32be
|
|
|
|
|
'magicNumber uint32be ;; set to 0x5F0F3CF5
|
|
|
|
|
'flags uint16be
|
|
|
|
|
'unitsPerEm uint16be ;; range from 64 to 16384
|
|
|
|
|
'created (+Array int32be 2)
|
|
|
|
|
'modified (+Array int32be 2)
|
|
|
|
|
'xMin int16be ;; for all glyph bounding boxes
|
|
|
|
|
'yMin int16be ;; for all glyph bounding boxes
|
|
|
|
|
'xMax int16be ;; for all glyph bounding boxes
|
|
|
|
|
'yMax int16be ;; for all glyph bounding boxes
|
|
|
|
|
'macStyle (+Bitfield uint16be '(bold italic underline outline shadow condensed extended))
|
|
|
|
|
'lowestRecPPEM uint16be ;; smallest readable size in pixels
|
|
|
|
|
'fontDirectionHint int16be
|
|
|
|
|
'indexToLocFormat int16be ;; 0 for short offsets 1 for long
|
|
|
|
|
'glyphDataFormat int16be ;; 0 for current format
|
|
|
|
|
)))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(test-module
|
|
|
|
|
(require racket/serialize)
|
|
|
|
|
(define ip (open-input-file charter-italic-path))
|
|
|
|
|
(define dir (deserialize (read (open-input-file charter-italic-directory-path))))
|
|
|
|
|
(define offset (· dir tables head offset))
|
|
|
|
|
(define length (· dir tables head length))
|
|
|
|
|
(check-equal? offset 236)
|
|
|
|
|
(check-equal? length 54)
|
|
|
|
|
(define table-bytes #"\0\1\0\0\0\2\0\0.\252t<_\17<\365\0\t\3\350\0\0\0\0\316\3\301\261\0\0\0\0\316\3\304\364\377\36\377\24\4\226\3\324\0\2\0\t\0\2\0\0\0\0")
|
|
|
|
|
(set-port-position! ip 0)
|
|
|
|
|
(check-equal? (peek-bytes length offset ip) table-bytes)
|
|
|
|
|
(define table-data (send head decode table-bytes))
|
|
|
|
|
(check-equal? (· table-data unitsPerEm) 1000)
|
|
|
|
|
(check-equal? (· table-data yMin) -236)
|
|
|
|
|
(check-equal? (· table-data yMax) 980)
|
|
|
|
|
(check-equal? (· table-data xMax) 1174)
|
|
|
|
|
(check-equal? (· table-data xMin) -226)
|
|
|
|
|
(check-equal? (· table-data macStyle) (make-hasheq '((shadow . #f)
|
|
|
|
|
(extended . #f)
|
|
|
|
|
(condensed . #f)
|
|
|
|
|
(underline . #f)
|
|
|
|
|
(outline . #f)
|
|
|
|
|
(bold . #f)
|
|
|
|
|
(italic . #t))))
|
|
|
|
|
(check-equal? (· table-data magicNumber) #x5F0F3CF5)
|
|
|
|
|
(check-equal? (· table-data indexToLocFormat) 0) ; used in loca table
|
|
|
|
|
(check-equal? (encode head table-data #f) table-bytes))
|
