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34 lines
1.0 KiB
Racket
34 lines
1.0 KiB
Racket
#lang racket/base
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(require (prefix-in Script- "script.rkt")
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sugar/unstable/class
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sugar/unstable/js
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racket/class)
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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/layout/GlyphRun.js
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|#
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;; Represents a run of Glyph and GlyphPosition objects.
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;; Returned by the font layout method.
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(define-subclass object% (GlyphRun
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glyphs ; An array of Glyph objects in the run
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positions) ; An array of GlyphPosition objects for each glyph in the run
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(define/public (advanceWidth)
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(for/sum ([pos (in-list positions)])
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(· pos xAdvance))))
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(define (append-glyphruns . grs)
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(for/fold ([glyphss null]
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[positionss null]
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#:result (make-object GlyphRun
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(apply append (reverse glyphss))
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(apply append (reverse positionss))))
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([gr (in-list grs)])
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(values (cons (get-field glyphs gr) glyphss)
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(cons (get-field positions gr) positionss))))
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