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89 lines
2.8 KiB
Racket
89 lines
2.8 KiB
Racket
#lang pitfall/racket
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(require "font.rkt")
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(provide fonts-mixin)
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(define (fonts-mixin [% mixin-tester%])
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(class %
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(super-new)
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;; Lookup table for embedded fonts
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(field [_fontFamilies #f]
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[_fontCount #f]
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;; Font state
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[_fontSize #f]
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[_font #f]
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[_registeredFonts #f])
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(as-methods
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initFonts
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font
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fontSize)))
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(define/contract (initFonts this)
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(->m void?)
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(set-field! _fontFamilies this (mhash))
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(set-field! _fontCount this 0)
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(set-field! _fontSize this 12)
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(set-field! _font this #f)
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(set-field! _registeredFonts this (mhash))
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;; set the default font
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(send this font "Helvetica")
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(void))
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(define/contract (font this src [size-or-family #f] [maybe-size #f])
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((any/c) ((or/c string? number? #f) (or/c number? #f)) . ->*m . object?)
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(match-define (list family size) (if (number? size-or-family)
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(list #f size-or-family)
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(list size-or-family maybe-size)))
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;; check registered fonts if src is a string
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(define cacheKey (let ([this-rfs (· this _registeredFonts)])
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(cond
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[(and (string? src) (hash-ref this-rfs src #f))
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(define ck src)
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(set! src (hash-ref (hash-ref this-rfs src) src #f))
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(set! family (hash-ref (hash-ref this-rfs src) family #f))
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ck]
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[else (let ([ck (or family src)])
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(and (string? ck) ck))])))
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(when size (set-field! fontSize this size))
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;; fast path: check if the font is already in the PDF
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(cond
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[(hash-ref (· this _fontFamilies) cacheKey #f) =>
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(λ (val)
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(set-field! _font this val)
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this)]
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;; load the font
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[else
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(define id (format "F~a" (increment-field! _fontCount this)))
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(set-field! _font this (PDFFont-open this src family id))
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;; check for existing font familes with the same name already in the PDF
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;; useful if the font was passed as a buffer
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(let* ([this-ff (· this _fontFamilies)]
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[this-f (· this _font)]
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[font (hash-ref this-ff (· this-f name) #f)])
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(cond
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[font (set-field! _font this font)]
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;; save the font for reuse later
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[else
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(when cacheKey (hash-set! this-ff cacheKey this-f))
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(hash-set! this-ff (· this-f name) this-f)]))
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this]))
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(define/contract (fontSize this size)
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(number? . ->m . object?)
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(set-field! _fontSize this size)
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this)
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(module+ test
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(define fo (new (fonts-mixin))))
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