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36 lines
1.4 KiB
Racket
36 lines
1.4 KiB
Racket
8 years ago
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#lang pitfall/racket
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(require "bbox.rkt" "script.rkt")
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(provide GlyphRun)
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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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features-in
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script ; The script that was requested for shaping. This was either passed in or detected automatically.
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language) ; The language requested for shaping, as passed in. If `null`, the default language for the script was used.
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;; An array of GlyphPosition objects for each glyph in the run
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(field [positions #f])
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;; The directionality of the requested script (either ltr or rtl).
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(field [direction (script-direction script)])
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;; The features requested during shaping. This is a combination of user
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;; specified features and features chosen by the shaper.
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(field [features (cond
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[(hash? features-in) features-in]
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;; Convert features to an object
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[(list? features-in)
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(define f (mhash))
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(for ([tag (in-list features)])
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(hash-set! f tag #t))
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f]
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[(not features-in) (mhash)]
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[else (error 'glyphrun:unknown-features-type)])])
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)
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