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Matthew Butterick 6 years ago
parent 7df396a31b
commit bb9652663f
3 changed files with 436 additions and 8 deletions
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440
fontland/fontland/cff-glyph.rkt
Unescape Escape View File

@ -1,5 +1,6 @@
#lang debug racket/base
(require (for-syntax)
#lang debug racket
(require racket/match
xenomorph
fontland/struct
fontland/table-stream
fontland/table/cff/cff-font
@ -19,12 +20,16 @@ https://github.com/mbutterick/fontkit/blob/master/src/glyph/CFFGlyph.js
(define (getPath this)
(define stream (ttf-font-port (glyph-font this)))
(define pos (pos stream))
;;;(define pos (pos stream))
(define cff (get-table (glyph-font this) 'CFF_))
(define str (list-ref (hash-ref (hash-ref cff 'topDict) 'CharStrings) (glyph-id this)))
(define end (+ (hash-ref str 'offset) (hash-ref str 'length)))
(pos stream (hash-ref str 'offset))
#R (pos stream)
#R end
(define path (Path))
(define stack null)
(define trans null)
@ -55,12 +60,24 @@ https://github.com/mbutterick/fontkit/blob/master/src/glyph/CFFGlyph.js
(car ID)
(set! ID (cdr ID))))
(define-syntax-rule (push ID VAL ...)
(begin
(set! ID (append ID (list VAL ...)))
ID))
(define-syntax-rule (pop ID)
(cond
[(> (length ID) 0)
(define-values (head last) (split-at-right ID 1))
(set! ID head)
last]))
(define (checkWidth)
(unless width
(set! width (+ (shift stack) (hash-ref privateDict 'nominalWidthX)))))
(define (parseStems)
(unless (odd? (length stack))
(when (not (zero? (modulo (length stack) 2)))
(checkWidth))
(set! nStems (+ nStems (arithmetic-shift (length stack) -1)))
@ -74,6 +91,415 @@ https://github.com/mbutterick/fontkit/blob/master/src/glyph/CFFGlyph.js
(set! open #true))
(define (parse)
(error 'parse-unfinished))
(error 'getpath-unfinished))
#R 'in-parse
(let/ec return
(let loop ()
(when (< (pos stream) end)
(define op (read-byte stream))
#R op
(cond
[(< op 32)
(case op
[(1 ;; hstem
3 ;; vstem
18 ;; hstemhm
23) ;; vstemhm
(parseStems)]
[(4) ;; vmoveto
(when (> (length stack) 1)
(checkWidth))
(set! y (+ y (shift stack)))
(moveTo x y)]
[(5) ;; rlineto
(let loop ()
(when (>= (length stack) 2)
(set! x (+ x (shift stack)))
(set! y (+ y (shift stack)))
(path-lineTo path x y)
(loop)))]
[(6 ;; hlineto
7) ;; vlineto
(define phase (= op 6))
(let loop ()
(when (>= (length stack) 1)
(if phase
(set! x (+ x (shift stack)))
(set! y (+ y (shift stack)))))
(loop))
(path-lineTo path x y)
(set! phase (not phase))]
[(8) ;; rrcurveto
(let loop ()
(when (> (length stack) 0)
(define c1x (+ x (shift stack)))
(define c1y (+ y (shift stack)))
(define c2x (+ c1x (shift stack)))
(define c2y (+ c1y (shift stack)))
(path-bezierCurveTo path c1x c1y c2x c2y x y)))]
[(10) ;; callsubr
(define index (+ (pop stack) subrsBias))
(define subr (list-ref subrs index))
(when subr
(hash-set! usedSubrs index #true)
(define p (pos stream))
(define e end)
(pos stream (hash-ref subr 'offset))
(set! end (+ (hash-ref subr 'offset) (hash-ref subr 'length)))
(parse)
(pos stream p)
(set! end e))]
[(11) ;; return
(cond
[(>= (hash-ref cff 'version) 2) (void)]
[else (return)])]
[(14) ;; endchar
(cond
[(>= (hash-ref cff 'version) 2) (void)]
[else
(when (> (length stack) 0)
(checkWidth))
(when open
(path-closePath path)
(set! open #false))])]
[(15) ;; vsindex
(when (< (hash-ref cff 'version) 2)
(error 'vsindex-operator-not-supported))]
[(16) ;; blend
(error 'blend-operator-not-supported)]
[(19 ;; hintmask
20) ;; cntrmask
(parseStems)
(pos stream (+ (pos stream) (arithmetic-shift (+ nStems 7) -3)))]
[(21) ;; rmoveto
(when (> (length stack) 2)
(checkWidth))
(set! x (+ x (shift stack)))
(set! y (+ y (shift stack)))
(moveTo x y)]
[(22) ;; hmoveto
(when (> (length stack) 1)
(checkWidth))
(set! x (+ x (shift stack)))
(moveTo x y)]
[(24) ;; rcurveline
(let loop ()
(when (>= (length stack) 8)
(define c1x (+ x (shift stack)))
(define c1y (+ y (shift stack)))
(define c2x (+ c1x (shift stack)))
(define c2y (+ c1y (shift stack)))
(set! x (+ c2x (shift stack)))
(set! y (+ c2y (shift stack)))
(path-bezierCurveTo path c1x c1y c2x c2y x y)
(loop)))
(set! x (+ x (shift stack)))
(set! y (+ y (shift stack)))
(path-lineTo path x y)]
[(25) ;; rlinecurve
(let loop ()
(when (>= (length stack) 8)
(set! x (+ x (shift stack)))
(set! y (+ y (shift stack)))
(path-lineTo path x y)
(loop)))
(define c1x (+ x (shift stack)))
(define c1y (+ y (shift stack)))
(define c2x (+ c1x (shift stack)))
(define c2y (+ c1y (shift stack)))
(set! x (+ c2x (shift stack)))
(set! y (+ c2y (shift stack)))
(path-bezierCurveTo path c1x c1y c2x c2y x y)]
[(26) ;; vvcurveto
(when (not (zero? (modulo (length stack) 2)))
(set! x (+ x (shift stack))))
(let loop ()
(when (>= (length stack) 4)
(define c1x x)
(define c1y (+ y (shift stack)))
(define c2x (+ c1x (shift stack)))
(define c2y (+ c1y (shift stack)))
(set! x c2x)
(set! y (+ c2y (shift stack)))
(path-bezierCurveTo path c1x c1y c2x c2y x y)
(loop)))]
[(27) ;; hhcurveto
(when (not (zero? (modulo (length stack) 2)))
(set! y (+ y (shift stack))))
(let loop ()
(when (>= (length stack) 4)
(define c1x (+ x (shift stack)))
(define c1y y)
(define c2x (+ c1x (shift stack)))
(define c2y (+ c1y (shift stack)))
(set! x (+ c2x (shift stack)))
(set! y c2y)
(path-bezierCurveTo path c1x c1y c2x c2y x y)
(loop)))]
[(28) ;; shortint
(push stack (decode int16be stream))]
[(29) ;; callgsubr
(define index (+ (pop stack) gsubrsBias))
(define subr (hash-ref gsubrs index))
(when subr
(hash-set! usedGsubrs index #true)
(define p (pos stream))
(define e end)
(pos stream (hash-ref subr 'offset))
(set! end (+ (hash-ref subr 'offset) (hash-ref subr 'length)))
(parse)
(pos stream p)
(set! end e))]
[(30 ;; vhcurveto
31) ;; hvcurveto
(define phase (= op 31))
(let loop ()
(when (>= (length stack) 4)
(cond
[phase
(define c1x (+ x (shift stack)))
(define c1y y)
(define c2x (+ c1x (shift stack)))
(define c2y (+ c1y (shift stack)))
(set! y (+ c2y (shift stack)))
(set! x (+ c2x (if (= (length stack) 1) (shift stack) 0)))
(path-bezierCurveTo path c1x c1y c2x c2y x y)
(set! phase (not phase))]
[else
(define c1x x)
(define c1y (+ y (shift stack)))
(define c2x (+ c1x (shift stack)))
(define c2y (+ c1y (shift stack)))
(set! x (+ c2x (shift stack)))
(set! y (+ c2y (if (= (length stack) 1) (shift stack) 0)))
(path-bezierCurveTo path c1x c1y c2x c2y x y)
(set! phase (not phase))])
(loop)))]
[(12)
(define op (read-byte stream))
(println "warning: check truthiness")
(case op
[(3) ;; and
(define a (pop stack))
(define b (pop stack))
(push stack (if (and a b) 1 0))]
[(4) ;; or
(define a (pop stack))
(define b (pop stack))
(push stack (if (or a b) 1 0))]
[(5) ;; not
(define a (pop stack))
(push stack (if a 0 1))]
[(9) ;; abs
(define a (pop stack))
(push stack (abs a))]
[(10) ;; add
(define a (pop stack))
(define b (pop stack))
(push stack (+ a b))]
[(11) ;; sub
(define a (pop stack))
(define b (pop stack))
(push stack (- a b))]
[(12) ;; div
(define a (pop stack))
(define b (pop stack))
(push stack (/ a b 1.0))]
[(14) ;; neg
(define a (pop stack))
(push stack (- a))]
[(15) ;; eq
(define a (pop stack))
(define b (pop stack))
(push stack (if (- a b) 1 0))]
[(18) ;; drop
(pop stack)]
[(20) ;; put
(define val (pop stack))
(define idx (pop stack))
(set! trans (list-set trans idx val))]
[(21) ;; get
(define idx (pop stack))
(push stack (or (list-ref trans idx) 0))]
[(22) ;; ifelse
(define s1 (pop stack))
(define s2 (pop stack))
(define v1 (pop stack))
(define v2 (pop stack))
(push stack (if (<= v1 v2) s1 s2))]
[(23) ;; random
(push stack (random))]
[(24) ;; mul
(define a (pop stack))
(define b (pop stack))
(push stack (* a b))]
[(26) ;; sqrt
(define a (pop stack))
(push stack (sqrt a))]
[(26) ;; dup
(define a (pop stack))
(push stack a a)]
[(28) ;; exch
(define a (pop stack))
(define b (pop stack))
(push stack b a)]
[(29) ;; index
(define idx (pop stack))
(cond
[(< idx 0)
(set! idx 0)]
[(> idx (- (length stack) 1))
(set! idx (- (length stack) 1))])
(push stack (list-ref stack idx))]
[(30) ;; roll
(define n (pop stack))
(define j (pop stack))
(cond
[(>= j 0)
(let loop ()
(when (> j 0)
(define t (list-ref stack (- n 1)))
(for [(i (in-range (- n 2) (sub1 0) -1))]
(set! stack
(list-set stack (+ i 1) (list-ref stack i))))
(set! stack (list-set stack 0 t))
(set! j (sub1 j))
(loop)))]
[else
(let loop ()
(when (< j 0)
(define t (list-ref stack 0))
(for ([i (in-range (add1 n))])
(set! stack (list-set stack i (list-ref stack (+ i 1)))))
(set! stack (list-set stack (- n 1) t))))])]
[(34) ;; hflex
(define c1x (+ x (shift stack)))
(define c1y y)
(define c2x (+ c1x (shift stack)))
(define c2y (+ c1y (shift stack)))
(define c3x (+ c2x (shift stack)))
(define c3y c2y)
(define c4x (+ c3x (shift stack)))
(define c4y c3y)
(define c5x (+ c4x (shift stack)))
(define c5y c4y)
(define c6x (+ c5x (shift stack)))
(define c6y c5y)
(set! x c6x)
(set! y c6y)
(path-bezierCurveTo path c1x c1y c2x c2y c3x c3y)
(path-bezierCurveTo path c4x c4y c5x c5y c6x c6y)]
[(35) ;; flex
(define pts null)
(for ([i (in-range (add1 5))])
(set! x (+ x (shift stack)))
(set! y (+ y (shift stack)))
(push pts x y))
(apply path-bezierCurveTo path (take pts 6))
(apply path-bezierCurveTo path (drop pts 6))
(shift stack) ;; fd
]
[(36) ;; hflex1
(define c1x (+ x (shift stack)))
(define c1y (+ y (shift stack)))
(define c2x (+ c1x (shift stack)))
(define c2y (+ c1y (shift stack)))
(define c3x (+ c2x (shift stack)))
(define c3y c2y)
(define c4x (+ c3x (shift stack)))
(define c4y c3y)
(define c5x (+ c4x (shift stack)))
(define c5y (+ c4y (shift stack)))
(define c6x (+ c5x (shift stack)))
(define c6y c5y)
(set! x c6x)
(set! y c6y)
(path-bezierCurveTo path c1x c1y c2x c2y c3x c3y)
(path-bezierCurveTo path c4x c4y c5x c5y c6x c6y)]
[(37) ;; flex1
(define startx x)
(define starty y)
(define pts null)
(for ([i (in-range 0 (add1 4))])
(set! x (+ x (shift stack)))
(set! y (+ y (shift stack)))
(push pts x y))
(cond
[(> (abs (- x startx)) (abs (- y starty))) ;; horzontal
(set! x (shift stack))
(set! y starty)]
[else
(set! x startx)
(set! y (shift stack))])
(push pts x y)
(apply path-bezierCurveTo path (take pts 6))
(apply path-bezierCurveTo path (drop pts 6))]
[else (error (format "unknown op: 12 ~a" op))])]
[else (error (format "unknown op: ~a" op))])]
[(< op 247) (push stack (- op 139))]
[(< op 251)
(define b1 (read-byte stream))
(push stack (+ (* (- op 247) 256) b1 108))]
[(< op 255)
(define b1 (read-byte stream))
(push stack (- (* (- op 251) 256) b1 108))]
[else
(push stack (/ (decode int32be stream) 65536))])
(loop)))))
(parse)
(when open
(path-closePath path))
#R path
(set-cff-glyph-path! this path)
path)

1
fontland/fontland/subset.rkt
Unescape Escape View File

@ -95,6 +95,7 @@ https://github.com/mbutterick/fontkit/blob/master/src/subset/CFFSubset.js
(unless (cff-glyph-path glyph)
(set-cff-glyph-path! glyph (getPath glyph))) ;; this causes the glyph to be parsed
#R (cff-glyph-path glyph)
(for ([subr (in-hash-keys #R (cff-glyph-_usedGsubrs glyph))])
(hash-set! gsubrs subr #true)))

3
fontland/fontland/table/cff/cff-font.rkt
Unescape Escape View File

@ -82,7 +82,8 @@ https://github.com/mbutterick/fontkit/blob/master/src/cff/CFFFont.js
(define (privateDictForGlyph this gid)
(cond
[(and (hash-has-key? this 'topDict)
(hash-has-key? (hash-ref this 'topDict) 'FDSelect))
(hash-has-key? (hash-ref this 'topDict) 'FDSelect)
(hash-ref* this 'topDict 'FDSelect))
(define fd (fdForGlyph this gid))
(if (list-ref (hash-ref* this 'topDict 'FDArray) fd)
(hash-ref (list-ref (hash-ref* 'topDict 'FDArray) fd) 'Private)

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