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1
| Glyph = require './Glyph'
Path = require './Path'
class CFFGlyph extends Glyph
_getName: ->
return @_font['CFF '].getGlyphName @id
bias = (s) ->
if s.length < 1240
return 107
else Eif s.length < 33900
return 1131
else
return 32768
_getPath: ->
stream = @_font.stream
pos = stream.pos
cff = @_font['CFF ']
str = cff.topDict.CharStrings[@id]
end = str.offset + str.length
stream.pos = str.offset
path = new Path
stack = []
trans = []
width = null
nStems = 0
x = y = 0
@_usedGsubrs = usedGsubrs = {}
@_usedSubrs = usedSubrs = {}
gsubrs = cff.globalSubrIndex or []
gsubrsBias = bias gsubrs
privateDict = cff.privateDictForGlyph @id
subrs = privateDict.Subrs or []
subrsBias = bias subrs
parseStems = ->
if stack.length % 2 isnt 0
width ?= stack.shift() + privateDict.nominalWidthX
nStems += stack.length >> 1
stack.length = 0
do parse = ->
while stream.pos < end
op = stream.readUInt8()
if op < 32
switch op
when 1, 3, 18, 23 # hstem, vstem, hstemhm, vstemhm
parseStems()
when 4 # vmoveto
Iif stack.length > 1
width ?= stack.shift() + privateDict.nominalWidthX
y += stack.shift()
path.moveTo x, y
when 5 # rlineto
while stack.length >= 2
x += stack.shift()
y += stack.shift()
path.lineTo x, y
when 6, 7 # hlineto, vlineto
phase = op is 6
while stack.length >= 1
if phase
x += stack.shift()
else
y += stack.shift()
path.lineTo x, y
phase = !phase
when 8 # rrcurveto
while stack.length > 0
c1x = x + stack.shift()
c1y = y + stack.shift()
c2x = c1x + stack.shift()
c2y = c1y + stack.shift()
x = c2x + stack.shift()
y = c2y + stack.shift()
path.bezierCurveTo c1x, c1y, c2x, c2y, x, y
when 10 # callsubr
index = stack.pop() + subrsBias
subr = subrs[index]
Eif subr
usedSubrs[index] = true
p = stream.pos
e = end
stream.pos = subr.offset
end = subr.offset + subr.length
parse()
stream.pos = p
end = e
when 11 # return
return
when 14 # endchar
if stack.length > 0
width ?= stack.shift() + privateDict.nominalWidthX
path.closePath()
when 19, 20 # hintmask, cntrmask
parseStems()
stream.pos += (nStems + 7) >> 3
when 21 # rmoveto
Iif stack.length > 2
width ?= stack.shift() + privateDict.nominalWidthX
haveWidth = true
x += stack.shift()
y += stack.shift()
path.moveTo x, y
when 22 # hmoveto
Iif stack.length > 1
width ?= stack.shift() + privateDict.nominalWidthX
x += stack.shift()
path.moveTo x, y
when 24 # rcurveline
while stack.length >= 8
c1x = x + stack.shift()
c1y = y + stack.shift()
c2x = c1x + stack.shift()
c2y = c1y + stack.shift()
x = c2x + stack.shift()
y = c2y + stack.shift()
path.bezierCurveTo c1x, c1y, c2x, c2y, x, y
x += stack.shift()
y += stack.shift()
path.lineTo x, y
when 25 # rlinecurve
while stack.length >= 8
x += stack.shift()
y += stack.shift()
path.lineTo x, y
c1x = x + stack.shift()
c1y = y + stack.shift()
c2x = c1x + stack.shift()
c2y = c1y + stack.shift()
x = c2x + stack.shift()
y = c2y + stack.shift()
path.bezierCurveTo c1x, c1y, c2x, c2y, x, y
when 26 # vvcurveto
Eif stack.length % 2
x += stack.shift()
while stack.length >= 4
c1x = x
c1y = y + stack.shift()
c2x = c1x + stack.shift()
c2y = c1y + stack.shift()
x = c2x
y = c2y + stack.shift()
path.bezierCurveTo c1x, c1y, c2x, c2y, x, y
when 27 # hhcurveto
Eif stack.length % 2
y += stack.shift()
while stack.length >= 4
c1x = x + stack.shift()
c1y = y
c2x = c1x + stack.shift()
c2y = c1y + stack.shift()
x = c2x + stack.shift()
y = c2y
path.bezierCurveTo c1x, c1y, c2x, c2y, x, y
when 28 # shortint
stack.push stream.readInt16BE()
when 29 # callgsubr
index = stack.pop() + gsubrsBias
subr = gsubrs[index]
Eif subr
usedGsubrs[index] = true
p = stream.pos
e = end
stream.pos = subr.offset
end = subr.offset + subr.length
parse()
stream.pos = p
end = e
when 30, 31 # vhcurveto, hvcurveto
phase = op is 31
while stack.length >= 4
if phase
c1x = x + stack.shift()
c1y = y
c2x = c1x + stack.shift()
c2y = c1y + stack.shift()
y = c2y + stack.shift()
x = c2x + (if stack.length is 1 then stack.shift() else 0)
else
c1x = x
c1y = y + stack.shift()
c2x = c1x + stack.shift()
c2y = c1y + stack.shift()
x = c2x + stack.shift()
y = c2y + (if stack.length is 1 then stack.shift() else 0)
path.bezierCurveTo c1x, c1y, c2x, c2y, x, y
phase = !phase
when 12
op = stream.readUInt8()
switch op
when 3 # and
a = stack.pop()
b = stack.pop()
stack.push if a and b then 1 else 0
when 4 # or
a = stack.pop()
b = stack.pop()
stack.push if a or b then 1 else 0
when 5 # not
a = stack.pop()
stack.push if a then 0 else 1
when 9 # abs
a = stack.pop()
stack.push Math.abs a
when 10 # add
a = stack.pop()
b = stack.pop()
stack.push a + b
when 11 # sub
a = stack.pop()
b = stack.pop()
stack.push a - b
when 12 # div
a = stack.pop()
b = stack.pop()
stack.push a / b
when 14 # neg
a = stack.pop()
stack.push -a
when 15 # eq
a = stack.pop()
b = stack.pop()
stack.push if a is b then 1 else 0
when 18 # drop
stack.pop()
when 20 # put
val = stack.pop()
idx = stack.pop()
trans[idx] = val
when 21 # get
idx = stack.pop()
stack.push trans[idx] or 0
when 22 # ifelse
s1 = stack.pop()
s2 = stack.pop()
v1 = stack.pop()
v2 = stack.pop()
stack.push if v1 <= v2 then s1 else s2
when 23 # random
stack.push Math.random()
when 24 # mul
a = stack.pop()
b = stack.pop()
stack.push a * b
when 26 # sqrt
a = stack.pop()
stack.push Math.sqrt a
when 27 # dup
a = stack.pop()
stack.push a, a
when 28 # exch
a = stack.pop()
b = stack.pop()
stack.push b, a
when 29 # index
idx = stack.pop()
if idx < 0
idx = 0
else if idx > stack.length - 1
idx = stack.length - 1
stack.push stack[idx]
when 30 # roll
n = stack.pop()
j = stack.pop()
if j >= 0
while j > 0
t = stack[n - 1]
for i in [n - 2..0] by -1
stack[i + 1] = stack[i]
stack[0] = t
j--
else
while j < 0
t = stack[0]
for i in [0..n] by 1
stack[i] = stack[i + 1]
stack[n - 1] = t
j++
when 34 # hflex
c1x = x + stack.shift()
c1y = y
c2x = c1x + stack.shift()
c2y = c1y + stack.shift()
c3x = c2x + stack.shift()
c3y = c2y
c4x = c3x + stack.shift()
c4y = c3y
c5x = c4x + stack.shift()
c5y = c4y
c6x = c5x + stack.shift()
c6y = c5y
x = c6x
y = c6y
path.bezierCurveTo c1x, c1y, c2x, c2y, c3x, c3y
path.bezierCurveTo c4x, c4y, c5x, c5y, c6x, c6y
when 35 # flex
pts = []
for i in [0...6]
x += stack.shift()
y += stack.shift()
pts.push x, y
path.bezierCurveTo pts[0...6]...
path.bezierCurveTo pts[6...]...
stack.shift() # fd
when 36 # hflex1
c1x = x + stack.shift()
c1y = y + stack.shift()
c2x = c1x + stack.shift()
c2y = c1y + stack.shift()
c3x = c2x + stack.shift()
c3y = c2y
c4x = c3x + stack.shift()
c4y = c3y
c5x = c4x + stack.shift()
c5y = c4y + stack.shift()
c6x = c5x + stack.shift()
c6y = c5y
x = c6x
y = c6y
path.bezierCurveTo c1x, c1y, c2x, c2y, c3x, c3y
path.bezierCurveTo c4x, c4y, c5x, c5y, c6x, c6y
when 37 # flex1
startx = x
starty = y
pts = []
for i in [0...5]
x += stack.shift()
y += stack.shift()
pts.push x, y
if Math.abs(x - startx) > Math.abs(y - starty) # horizontal
x += stack.shift()
y = starty
else
x = startx
y += stack.shift()
pts.push x, y
path.bezierCurveTo pts[0...6]...
path.bezierCurveTo pts[6...]...
else
throw new Error 'Unknown op: 12 ' + op
else
throw new Error 'Unknown op: ' + op
else if op < 247
stack.push op - 139
else if op < 251
b1 = stream.readUInt8()
stack.push (op - 247) * 256 + b1 + 108
else Eif op < 255
b1 = stream.readUInt8()
stack.push -(op - 251) * 256 - b1 - 108
else
stack.push stream.readInt32BE() / 65536
return path
module.exports = CFFGlyph
|