You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
|
|
|
|
|
#lang racket/base
|
|
|
|
|
|
(require "racket.rkt")
|
|
|
|
|
|
|
|
|
|
|
|
(require xenomorph)
|
|
|
|
|
|
(provide (all-defined-out))
|
|
|
|
|
|
#|
|
|
|
|
|
|
approximates
|
|
|
|
|
|
https://github.com/mbutterick/fontkit/blob/master/src/tables/hmtx.js
|
|
|
|
|
|
|#
|
|
|
|
|
|
|
|
|
|
|
|
(define-subclass Struct (Rhmtx))
|
|
|
|
|
|
|
|
|
|
|
|
(define HmtxEntry (+Struct
|
|
|
|
|
|
(dictify
|
|
|
|
|
|
'advance uint16be
|
|
|
|
|
|
'bearing int16be)))
|
|
|
|
|
|
|
|
|
|
|
|
(define hmtx (+Rhmtx
|
|
|
|
|
|
(dictify
|
|
|
|
|
|
'metrics (+LazyArray HmtxEntry (λ (this-array) (· this-array parent hhea numberOfMetrics)))
|
|
|
|
|
|
'bearings (+LazyArray int16be (λ (this-array) (- (· this-array parent maxp numGlyphs)
|
|
|
|
|
|
(· this-array parent hhea numberOfMetrics)))))))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(test-module
|
|
|
|
|
|
;; same as hmtx but doesn't require resolution of function to get length
|
|
|
|
|
|
(define hmtx-test (+Rhmtx
|
|
|
|
|
|
(dictify
|
|
|
|
|
|
'metrics (+LazyArray HmtxEntry (λ (t) 229))
|
|
|
|
|
|
'bearing (+LazyArray int16be (λ (t) 0)))))
|
|
|
|
|
|
(define ip (open-input-file charter-path))
|
|
|
|
|
|
(define dir (deserialize (read (open-input-file charter-directory-path))))
|
|
|
|
|
|
(define hmtx-offset (· dir tables hmtx offset))
|
|
|
|
|
|
(define hmtx-length (· dir tables hmtx length))
|
|
|
|
|
|
(check-equal? hmtx-offset 456)
|
|
|
|
|
|
(check-equal? hmtx-length 916)
|
|
|
|
|
|
(define hmtx-bytes (peek-bytes hmtx-length hmtx-offset ip))
|
|
|
|
|
|
(define hmtx-data (decode hmtx-test hmtx-bytes))
|
|
|
|
|
|
(check-equal? (send hmtx-test size) (* 229 (send HmtxEntry size)))
|
|
|
|
|
|
(define H-gid 41) (define OE-gid 142)
|
|
|
|
|
|
(check-equal? (dump (send (· hmtx-data metrics) get H-gid)) '#hasheq((advance . 738) (bearing . 33)))
|
|
|
|
|
|
(check-equal? (dump (send (· hmtx-data metrics) get OE-gid)) '#hasheq((advance . 993) (bearing . 43)))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
)
|
