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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/post.js
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|#
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(define-subclass VersionedStruct (Rpost))
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(define post (let ()
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(define header-fields
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(dictify 'italicAngle fixed32be ;; Italic angle in counter-clockwise degrees from the vertical.
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'underlinePosition int16be ;; Suggested distance of the top of the underline from the baseline
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'underlineThickness int16be ;; Suggested values for the underline thickness
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'isFixedPitch uint32be ;; Whether the font is monospaced
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'minMemType42 uint32be ;; Minimum memory usage when a TrueType font is downloaded as a Type 42 font
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'maxMemType42 uint32be ;; Maximum memory usage when a TrueType font is downloaded as a Type 42 font
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'minMemType1 uint32be ;; Minimum memory usage when a TrueType font is downloaded as a Type 1 font
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'maxMemType1 uint32be ;; Maximum memory usage when a TrueType font is downloaded as a Type 1 font
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))
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(make-object Rpost
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fixed32be
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(dictify
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1 (append header-fields null)
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2 (append header-fields (dictify 'numberOfGlyphs uint16be
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'glyphNameIndex (+Array uint16be 'numberOfGlyphs)
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;; this field causes problems due to deficiency in String class
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;; 'names (+Array (+String uint8))
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))
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2.5 (append header-fields (dictify 'numberOfGlyphs uint16be
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'offsets (+Array uint8)))
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3 (append header-fields null)
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4 (append header-fields (dictify 'map (+Array uint32be (λ (t) (· t parent maxp numGlyphs)))))))))
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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 post offset))
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(define len (· dir tables post length))
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(check-equal? offset 41520)
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(check-equal? len 514)
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(define ds (+DecodeStream (peek-bytes len offset ip)))
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(define version (send fixed32be decode ds)) ; version = 2
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(send post force-version! version)
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(define table-data (send post decode ds))
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(check-equal? (· table-data underlineThickness) 58)
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(check-equal? (· table-data underlinePosition) -178))
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