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#lang racket/base
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(require (for-syntax racket/base)
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xenomorph
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racket/class
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racket/match
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racket/list
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racket/contract
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sugar/unstable/class
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sugar/unstable/dict
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sugar/unstable/js
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sugar/unstable/stub
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"unsafe/freetype.rkt"
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"helper.rkt")
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(provide (all-defined-out))
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(module+ test (require rackunit))
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#|
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/**
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* Glyph objects represent a glyph in the font. They have various properties for accessing metrics and
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* the actual vector path the glyph represents, and methods for rendering the glyph to a graphics context.
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*
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* You do not create glyph objects directly. They are created by various methods on the font object.
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* There are several subclasses of the base Glyph class internally that may be returned depending
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* on the font format, but they all inherit from this class.
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*/
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|#
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#|
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approximates
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https://github.com/mbutterick/fontkit/blob/master/src/glyph/Glyph.js
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|#
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#;(define-subclass object% (Glyph id codePoints font)
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(field [_font font]
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[isMark (andmap is-mark? codePoints)]
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[isLigature (> (length codePoints) 1)]
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[_metrics #f])
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(as-methods
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advanceWidth
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_getMetrics))
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(struct glyph (id codePoints font _font isMark isLigature _metrics) #:transparent #:mutable)
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(define (+glyph id codePoints font
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[_font font]
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[isMark (andmap is-mark? codePoints)]
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[isLigature (> (length codePoints) 1)]
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[_metrics #f]
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#:constructor [constructor glyph])
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(constructor id codePoints font _font isMark isLigature _metrics))
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#;(define-stub-stop _getPath)
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#;(define-stub-stop _getCBox)
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#;(define-stub-stop _getBBox)
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#;(define-stub-stop _getTableMetrics)
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(define (glyph-advance-width g)
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(hash-ref (_getMetrics g) 'advanceWidth))
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(define (_getMetrics g)
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(unless (glyph-_metrics g)
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(define face (· (glyph-_font g) ft-face))
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(FT_Load_Glyph face (glyph-id g) FT_LOAD_NO_RECURSE)
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(define glyph (FT_FaceRec-glyph face))
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(define glyph-metrics (FT_GlyphSlotRec-metrics glyph))
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(set-glyph-_metrics! g (mhash))
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(hash-set*! (glyph-_metrics g)
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'advanceWidth (FT_Glyph_Metrics-horiAdvance glyph-metrics)
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'leftBearing (FT_Glyph_Metrics-horiBearingX glyph-metrics)))
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(glyph-_metrics g))
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