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nicely

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Matthew Butterick 5 years ago
parent 4f70d7c40c
commit a4802e4203
2 changed files with 24 additions and 32 deletions
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55
pitfall/pitfall/embedded.rkt
Unescape Escape View File

@ -7,7 +7,6 @@
racket/string
racket/format
racket/list
sugar/unstable/js
sugar/unstable/dict
"font.rkt"
fontland)
@ -22,11 +21,11 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/font/embedded.coffee
(define-syntax-rule (sum-flags [COND VAL] ...)
(for/sum ([c (in-list (list COND ...))]
[v (in-list (list VAL ...))]
#:when c)
v))
[v (in-list (list VAL ...))]
#:when c)
v))
(define (toHex . codePoints)
(define (to-hex . codePoints)
(string-append*
(for/list ([code (in-list codePoints)])
(~r code #:base 16 #:min-width 4 #:pad-string "0"))))
@ -74,7 +73,7 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/font/embedded.coffee
([(g i) (in-indexed glyphs)]
[posn (in-list positions)])
(define gid (subset-add-glyph! subset (glyph-id g)))
(define subset-idx (toHex gid))
(define subset-idx (to-hex gid))
(set-glyph-position-advance-width! posn (glyph-advance-width g))
(hash-ref! widths gid (λ () (glyph-position-advance-width posn)))
@ -87,28 +86,26 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/font/embedded.coffee
(define/override (embed)
;; no CFF support
(define isCFF #false) #;(is-a? (· this subset) CFFSubset)
(define fontFile (send @document ref))
(define isCFF #false) #;(is-a? subset CFFSubset)
(define font-file (send @document ref))
(when isCFF
(send fontFile set-key! 'Subtype "CIDFontType0C"))
(send font-file set-key! 'Subtype "CIDFontType0C"))
(send* fontFile [write (get-output-bytes (encode-to-port subset))] [end])
(define familyClass (let ([val (if (has-table? font 'OS/2)
(hash-ref (get-OS/2-table font) 'sFamilyClass)
0)])
(floor (/ val 256)))) ; equivalent to >> 8
(send* font-file [write (get-output-bytes (encode-to-port subset))] [end])
(define family-class (if (has-table? font 'OS/2)
(floor (/ (hash-ref (get-OS/2-table font) 'sFamilyClass) 256)) ; >> 8
0))
;; font descriptor flags
(match-define (list FIXED_PITCH SERIF SYMBOLIC SCRIPT _UNUSED NONSYMBOLIC ITALIC)
(map (λ (x) (expt 2 x)) (range 7)))
(define flags (sum-flags
[(not (zero? (hash-ref (get-post-table font) 'isFixedPitch))) FIXED_PITCH]
[(<= 1 familyClass 7) SERIF]
[(<= 1 family-class 7) SERIF]
[#t SYMBOLIC] ; assume the font uses non-latin characters
[(= familyClass 10) SCRIPT]
[(= family-class 10) SCRIPT]
[(hash-ref (hash-ref (get-head-table font) 'macStyle) 'italic) ITALIC]))
;; generate a random tag (6 uppercase letters. 65 is the char code for 'A')
@ -116,7 +113,6 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/font/embedded.coffee
(define tag (list->string (for/list ([i (in-range 6)])
(integer->char (random 65 (+ 65 26))))))
(define name (string-append tag "+" (font-postscript-name font)))
(define bbox (font-bbox font))
(define descriptor (send @document ref
(mhash
@ -128,17 +124,14 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/font/embedded.coffee
'ItalicAngle (font-italic-angle font)
'Ascent @ascender
'Descent @descender
'CapHeight (* (or (font-cap-height font) (· this sfont ascent)) scale)
'CapHeight (* (or (font-cap-height font) (font-ascent font)) scale)
'XHeight (* (or (font-x-height font) 0) scale)
'StemV 0)))
(send descriptor set-key! (if isCFF
'FontFile3
'FontFile2) fontFile)
(send descriptor set-key! (if isCFF 'FontFile3 'FontFile2) font-file)
(send descriptor end)
(define descendantFont (send @document ref
(define descendant-font (send @document ref
(mhash
'Type "Font"
'Subtype (string-append "CIDFontType" (if isCFF "0" "2"))
@ -151,14 +144,14 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/font/embedded.coffee
'FontDescriptor descriptor
'W (list 0 (for/list ([idx (in-range (length (hash-keys widths)))])
(hash-ref widths idx (λ () (error 'embed (format "hash key ~a not found" idx)))))))))
(send descendantFont end)
(send descendant-font end)
(send* @dictionary
[set-key! 'Type "Font"]
[set-key! 'Subtype "Type0"]
[set-key! 'BaseFont name]
[set-key! 'Encoding "Identity-H"]
[set-key! 'DescendantFonts (list descendantFont)]
[set-key! 'DescendantFonts (list descendant-font)]
[set-key! 'ToUnicode (toUnicodeCmap)])
(send @dictionary end))
@ -168,11 +161,11 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/font/embedded.coffee
(define cmap (send @document ref))
(define entries
(for/list ([idx (in-range (length (hash-keys unicode)))])
(define codePoints (hash-ref unicode idx))
(define codepoints (hash-ref unicode idx))
(define encoded ; encode codePoints to utf16
;; todo: full utf16 support. for now just utf8
(for/list ([value (in-list codePoints)])
(toHex value)))
(for/list ([value (in-list codepoints)])
(to-hex value)))
(format "<~a>" (string-join encoded " "))))
(define unicode-cmap-str #<<HERE
@ -200,7 +193,7 @@ HERE
)
(send* cmap
[write (format unicode-cmap-str (toHex (sub1 (length entries))) (string-join entries " "))]
[write (format unicode-cmap-str (to-hex (sub1 (length entries))) (string-join entries " "))]
[end])
cmap)))

1
pitfall/pitfall/standard-font.rkt
Unescape Escape View File

@ -3,7 +3,6 @@
(for-syntax racket/base)
racket/class
racket/file
sugar/unstable/js
sugar/unstable/dict
"afm-font.rkt"
"font.rkt"

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