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|
if not modules then modules = { } end modules ['font-tpk'] = {
version = 1.001,
comment = "companion to font-lib.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- The bitmap loader is more or less derived from the luatex version (taco)
-- which is derived from pdftex (thanh) who uses code from dvips (thomas)
-- adapted by piet ... etc. The tfm and vf readers are also derived from
-- luatex. All do things a bit more luaish and errors are of course mine.
local next = next
local extract, band, lshift, rshift = bit32.extract, bit32.band, bit32.lshift, bit32.rshift
local idiv = number.idiv
local char = string.char
local concat, insert, remove, copy = table.concat, table.insert, table.remove, table.copy
local tobitstring = number.tobitstring
local formatters = string.formatters
local round = math.round
local streams = utilities.streams
local openstream = streams.open
local streamsize = streams.size
local readcardinal1 = streams.readcardinal1
local readcardinal2 = streams.readcardinal2
local readcardinal3 = streams.readcardinal3
local readcardinal4 = streams.readcardinal4
local readinteger1 = streams.readinteger1
local readinteger2 = streams.readinteger2
local readinteger3 = streams.readinteger3
local readinteger4 = streams.readinteger4
local readbyte = streams.readbyte
local readbytes = streams.readbytes
local readstring = streams.readstring
local skipbytes = streams.skipbytes
local getposition = streams.getposition
local setposition = streams.setposition
if not fonts then fonts = { handlers = { tfm = { } } } end
local handlers = fonts.handlers
local tfm = handlers.tfm or { }
handlers.tfm = tfm
local readers = tfm.readers or { }
tfm.readers = readers
tfm.version = 1.005
tfm.cache = containers.define("fonts", "tfm", tfm.version, true)
-- Performance is no real issue here so I didn't optimize too much. After
-- all, these files are small and we mostly use opentype or type1 fonts.
do
local function readbitmap(glyph,s,flagbyte)
local inputbyte = 0
local bitweight = 0
local dynf = 0
local remainder = 0
local realfunc = nil
local repeatcount = 0
local function getnyb() -- can be inlined
if bitweight == 0 then
bitweight = 16
inputbyte = readbyte(s)
return extract(inputbyte,4,4)
else
bitweight = 0
return band(inputbyte,15)
end
end
local function getbit() -- can be inlined
bitweight = rshift(bitweight,1)
if bitweight == 0 then -- actually we can check for 1
inputbyte = readbyte(s)
bitweight = 128
end
return band(inputbyte,bitweight)
end
local function pkpackednum()
local i = getnyb(s)
if i == 0 then
repeat
j = getnyb()
i = i + 1
until (j ~= 0)
if i > 3 then
return handlehuge(i,j)
else
for i=1,i do
j = j * 16 + getnyb()
end
return j - 15 + (13 - dynf) * 16 + dynf
end
elseif i <= dynf then
return i
elseif i < 14 then
return (i - dynf - 1) * 16 + getnyb() + dynf + 1
elseif i == 14 then
repeatcount = pkpackednum()
else
repeatcount = 1
end
return realfunc()
end
local function rest()
if remainder < 0 then
remainder = -remainder
return 0
elseif remainder > 4000 then
remainder = 4000 - remainder
return 4000
elseif remainder > 0 then
local i = remainder
remainder = 0
realfunc = pkpackednum
return i
else
-- error = "pk issue that shouldn't happen"
return 0
end
end
local function handlehuge(i,j)
while i ~= 0 do
j = lshift(j,4) + getnyb()
-- j = extract(j,8,4) + getnyb()
i = i - 1
end
remainder = j - 15 + (13 - dynf) * 16 + dynf
realfunc = rest
return rest()
end
local gpower = { [0] =
0, 1, 3, 7, 15, 31, 63, 127,
255, 511, 1023, 2047, 4095, 8191, 16383, 32767,
65535
}
local raster = { }
local r = 0
glyph.stream = raster
local xsize = glyph.xsize
local ysize = glyph.ysize
local word = 0
local wordweight = 0
local wordwidth = idiv(xsize + 15,16)
local rowsleft = 0
local turnon = band(flagbyte,8) == 8 and true or false
local hbit = 0
local count = 0
--
realfunc = pkpackednum
dynf = idiv(flagbyte,16)
--
if dynf == 14 then
bitweight = 0
for i=1,ysize do
word = 0
wordweight = 32768
for j=1,xsize do
if getbit() ~= 0 then
word = word + wordweight
end
wordweight = rshift(wordweight,1)
if wordweight == 0 then
r = r + 1
raster[r] = word
word = 0
wordweight = 32768
end
end
if wordweight ~= 32768 then
r = r + 1
raster[r] = word
end
end
else
rowsleft = ysize
hbit = xsize
repeatcount = 0
wordweight = 16
word = 0
bitweight = 0
while rowsleft > 0 do
count = realfunc()
while count ~= 0 do
if count < wordweight and count < hbit then
if turnon then
word = word + gpower[wordweight] - gpower[wordweight - count]
end
hbit = hbit - count
wordweight = wordweight - count
count = 0
elseif count >= hbit and hbit <= wordweight then
if turnon then
word = word + gpower[wordweight] - gpower[wordweight - hbit]
end
r = r + 1
raster[r] = word
for i=1,repeatcount*wordwidth do
r = r + 1
raster[r] = raster[r - wordwidth]
end
rowsleft = rowsleft - repeatcount - 1
repeatcount = 0
word = 0
wordweight = 16
count = count - hbit
hbit = xsize
else
if turnon then
word = word + gpower[wordweight]
end
r = r + 1
raster[r] = word
word = 0
count = count - wordweight
hbit = hbit - wordweight
wordweight = 16
end
end
turnon = not turnon
end
if rowsleft ~= 0 or hbit ~= xsize then
print("ERROR",rowsleft,hbit,xsize)
-- error = "error while unpacking, more bits than required"
end
end
end
function readers.showpk(glyph)
local xsize = glyph.xsize
local ysize = glyph.ysize
local stream = glyph.stream
local result = { }
local rr = { }
local r = 0
local s = 0
local cw = idiv(xsize+ 7, 8)
local rw = idiv(xsize+15,16)
local extra = 2 * rw == cw
local b
for y=1,ysize do
r = 0
for x=1,rw-1 do
s = s + 1 ; b = stream[s]
r = r + 1 ; rr[r] = tobitstring(b,16,16)
end
s = s + 1 ; b = stream[s]
if extra then
r = r + 1 ; rr[r] = tobitstring(b,16,16)
else
r = r + 1 ; rr[r] = tobitstring(extract(b,8+(8-cw),cw),cw,cw)
end
result[y] = concat(rr)
end
return concat(result,"\n")
end
local template = formatters [ [[
%.3N 0 %i %i %i %i d1
q
%i 0 0 %i %i %i cm
BI
/W %i
/H %i
/IM true
/BPC 1
/D [1 0]
ID %t
EI
Q]] ]
function readers.pktopdf(glyph,data,factor)
local width = data.width * factor
local xsize = glyph.xsize or 0
local ysize = glyph.ysize or 0
local xoffset = glyph.xoffset or 0
local yoffset = glyph.yoffset or 0
local stream = glyph.stream
local dpi = 1
local newdpi = 1
local xdpi = dpi * xsize / newdpi
local ydpi = dpi * ysize / newdpi
local llx = - xoffset
local lly = yoffset - ysize + 1
local urx = llx + xsize + 1
local ury = lly + ysize
local result = { }
local r = 0
local s = 0
local cw = idiv(xsize+ 7, 8)
local rw = idiv(xsize+15,16)
local extra = 2 * rw == cw
local b
for y=1,ysize do
for x=1,rw-1 do
s = s + 1 ; b = stream[s]
r = r + 1 ; result[r] = char(extract(b,8,8),extract(b,0,8))
end
s = s + 1 ; b = stream[s]
if extra then
r = r + 1 ; result[r] = char(extract(b,8,8),extract(b,0,8))
else
r = r + 1 ; result[r] = char(extract(b,8,8))
end
end
return template(width,llx,lly,urx,ury,xdpi,ydpi,llx,lly,xsize,ysize,result), width
end
function readers.loadpk(filename)
local s = openstream(filename)
local preamble = readcardinal1(s)
local version = readcardinal1(s)
local comment = readstring(s,readcardinal1(s))
local designsize = readcardinal4(s)
local checksum = readcardinal4(s)
local hppp = readcardinal4(s)
local vppp = readcardinal4(s)
if preamble ~= 247 or version ~= 89 or not vppp then
return { error = "invalid preamble" }
end
local glyphs = { }
local data = {
designsize = designsize,
comment = comment,
hppp = hppp,
vppp = vppp,
glyphs = glyphs,
}
while true do
local flagbyte = readcardinal1(s)
if flagbyte < 240 then
local c = band(flagbyte,7)
local length, index, width, pixels, xsize, ysize, xoffset, yoffset
if c >= 0 and c <= 3 then
length = band(flagbyte,7) * 256 + readcardinal1(s) - 3
index = readcardinal1(s)
width = readinteger3(s)
pixels = readcardinal1(s)
xsize = readcardinal1(s)
ysize = readcardinal1(s)
xoffset = readcardinal1(s)
yoffset = readcardinal1(s)
if xoffset > 127 then
xoffset = xoffset - 256
end
if yoffset > 127 then
yoffset = yoffset - 256
end
elseif c >= 4 and c <= 6 then
length = band(flagbyte,3) * 65536 + readcardinal1(s) * 256 + readcardinal1(s) - 4
index = readcardinal1(s)
width = readinteger3(s)
pixels = readcardinal2(s)
xsize = readcardinal2(s)
ysize = readcardinal2(s)
xoffset = readcardinal2(s)
yoffset = readcardinal2(s)
else -- 7
length = readcardinal4(s) - 9
index = readcardinal4(s)
width = readinteger4(s)
pixels = readcardinal4(s)
readcardinal4(s)
xsize = readcardinal4(s)
ysize = readcardinal4(s)
xoffset = readcardinal4(s)
yoffset = readcardinal4(s)
end
local glyph = {
index = index,
width = width,
pixels = pixels,
xsize = xsize,
ysize = ysize,
xoffset = xoffset,
yoffset = yoffset,
}
if length <= 0 then
data.error = "bad packet"
return data
end
readbitmap(glyph,s,flagbyte)
glyphs[index] = glyph
elseif flagbyte == 240 then
-- k[1] x[k]
skipbytes(s,readcardinal1(s))
elseif flagbyte == 241 then
-- k[2] x[k]
skipbytes(s,readcardinal2(s)*2)
elseif flagbyte == 242 then
-- k[3] x[k]
skipbytes(s,readcardinal3(s)*3)
elseif flagbyte == 243 then
-- k[4] x[k]
skipbytes(s,readcardinal4(s)*4) -- readinteger4
elseif flagbyte == 244 then
-- y[4]
skipbytes(s,4)
elseif flagbyte == 245 then
break
elseif flagbyte == 246 then
-- nop
else
data.error = "unknown pk command"
break
end
end
return data
end
end
do
local leftboundary = -1
local rightboundary = -2
local boundarychar = 65536
function readers.loadtfm(filename)
local data
--
local function someerror(m)
if not data then
data = { }
end
data.error = m or "fatal error"
return data
end
--
local s = openstream(filename)
if not s then
return someerror()
end
--
local wide = false
local header = 0
local max = 0
local size = streamsize(s)
local glyphs = table.setmetatableindex(function(t,k)
local v = {
-- we default because boundary chars have no dimension s
width = 0,
height = 0,
depth = 0,
italic = 0,
}
t[k] = v
return v
end)
local parameters = { }
local direction = 0
--
local lf, lh, bc, ec, nw, nh, nd, ni, nl, nk, ne, np
--
lf = readcardinal2(s)
if lf ~= 0 then
header = 6
max = 255
wide = false
lh = readcardinal2(s)
bc = readcardinal2(s)
ec = readcardinal2(s)
nw = readcardinal2(s)
nh = readcardinal2(s)
nd = readcardinal2(s)
ni = readcardinal2(s)
nl = readcardinal2(s)
nk = readcardinal2(s)
ne = readcardinal2(s)
np = readcardinal2(s)
else
header = 14
max = 65535
wide = readcardinal4(s) == 0
if not wide then
return someerror("invalid format")
end
lf = readcardinal4(s)
lh = readcardinal4(s)
bc = readcardinal4(s)
ec = readcardinal4(s)
nw = readcardinal4(s)
nh = readcardinal4(s)
nd = readcardinal4(s)
ni = readcardinal4(s)
nl = readcardinal4(s)
nk = readcardinal4(s)
ne = readcardinal4(s)
np = readcardinal4(s)
direction = readcardinal4(s)
end
if (bc > ec + 1) or (ec > max) then
return someerror("file is too small")
end
if bc > max then
bc, ec = 1, 0
end
local nlw = (wide and 2 or 1) * nl
local neew = (wide and 2 or 1) * ne
local ncw = (wide and 2 or 1) * (ec - bc + 1)
if lf ~= (header + lh + ncw + nw + nh + nd + ni + nlw + nk + neew + np) then
return someerror("file is too small")
end
if nw == 0 or nh == 0 or nd == 0 or ni == 0 then
return someerror("no glyphs")
end
if lf * 4 > size then
return someerror("file is too small")
end
local slh = lh
if lh < 2 then
return someerror("file is too small")
end
local checksum = readcardinal4(s)
local designsize = readcardinal2(s)
designsize = designsize * 256 + readcardinal1(s)
designsize = designsize * 16 + rshift(readcardinal1(s),4)
if designsize < 0xFFFF then
return someerror("weird designsize")
end
--
local alpha = 16
local z = designsize
while z >= 040000000 do
z = rshift(z,1)
alpha = alpha + alpha
end
local beta = idiv(256,alpha)
alpha = alpha * z
--
local function readscaled()
local a, b, c, d = readbytes(s,4)
local n = idiv(rshift(rshift(d*z,8)+c*z,8)+b*z,beta)
if a == 0 then
return n
elseif a == 255 then
return n - alpha
else
return 0
end
end
--
local function readunscaled()
local a, b, c, d = readbytes(s,4)
if a > 127 then
a = a - 256
end
return a * 0xFFFFF + b * 0xFFF + c * 0xF + rshift(d,4)
end
--
while lh > 2 do -- can be one-liner
skipbytes(s,4)
lh = lh - 1
end
local saved = getposition(s)
setposition(s,(header + slh + ncw) * 4 + 1)
local widths = { } for i=0,nw-1 do widths [i] = readscaled() end
local heights = { } for i=0,nh-1 do heights[i] = readscaled() end
local depths = { } for i=0,nd-1 do depths [i] = readscaled() end
local italics = { } for i=0,ni-1 do italics[i] = readscaled() end
if widths[0] ~= 0 or heights[0] ~= 0 or depths[0] ~= 0 then
return someerror("invalid dimensions")
end
--
local blabel = nl
local bchar = boundarychar
--
local ligatures = { }
if nl > 0 then
for i=0,nl-1 do
local a, b, c, d = readbytes(s,4)
ligatures[i] = {
skip = a,
nxt = b,
op = c,
rem = d,
}
if a > 128 then
if 256 * c + d >= nl then
return someerror("invalid ligature table")
end
if a == 255 and i == 0 then
bchar = b
end
else
if c < 128 then
-- whatever
elseif 256 * (c - 128) + d >= nk then
return someerror("invalid ligature table")
end
if (a < 128) and (i - 0 + a + 1 >= nl) then
return someerror("invalid ligature table")
end
end
if a == 255 then
blabel = 256 * c + d
end
end
end
local allkerns = { }
for i=0,nk-1 do
allkerns[i] = readscaled()
end
local extensibles = { }
for i=0,ne-1 do
extensibles[i] = wide and {
top = readcardinal2(s),
bot = readcardinal2(s),
mid = readcardinal2(s),
rep = readcardinal2(s),
} or {
top = readcardinal1(s),
bot = readcardinal1(s),
mid = readcardinal1(s),
rep = readcardinal1(s),
}
end
for i=1,np do
if i == 1 then
parameters[i] = readunscaled()
else
parameters[i] = readscaled()
end
end
for i=1,7 do
if not parameters[i] then
parameters[i] = 0
end
end
--
setposition(s,saved)
local extras = false
if blabel ~= nl then
local k = blabel
while true do
local l = ligatures[k]
local skip = l.skip
if skip <= 128 then
-- if l.op >= 128 then
-- extras = true -- kern
-- else
extras = true -- ligature
-- end
end
if skip == 0 then
k = k + 1
else
if skip >= 128 then
break
end
k = k + skip + 1
end
end
end
if extras then
local ligas = { }
local kerns = { }
local k = blabel
while true do
local l = ligatures[k]
local skip = l.skip
if skip <= 128 then
local nxt = l.nxt
local op = l.op
local rem = l.rem
if op >= 128 then
kerns[nxt] = allkerns[256 * (op - 128) + rem]
else
ligas[nxt] = { type = op * 2 + 1, char = rem }
end
end
if skip == 0 then
k = k + 1
else
if skip >= 128 then
break;
end
k = k + skip + 1
end
end
if next(kerns) then
local glyph = glyphs[leftboundary]
glyph.kerns = kerns
glyph.remainder = 0
end
if next(ligas) then
local glyph = glyphs[leftboundary]
glyph.ligatures = ligas
glyph.remainder = 0
end
end
for i=bc,ec do
local glyph, width, height, depth, italic, tag, remainder
if wide then
width = readcardinal2(s)
height = readcardinal1(s)
depth = readcardinal1(s)
italic = readcardinal1(s)
tag = readcardinal1(s)
remainder = readcardinal2(s)
else
width = readcardinal1(s)
height = readcardinal1(s)
depth = extract(height,0,4)
height = extract(height,4,4)
italic = readcardinal1(s)
tag = extract(italic,0,2)
italic = extract(italic,2,6)
remainder = readcardinal1(s)
end
if width == 0 then
-- nothing
else
if width >= nw or height >= nh or depth >= nd or italic >= ni then
return someerror("invalid dimension index")
end
local extensible, nextinsize
if tag == 0 then
-- nothing special
else
local r = remainder
if tag == 1 then
if r >= nl then
return someerror("invalid ligature index")
end
elseif tag == 2 then
if r < bc or r > ec then
return someerror("invalid chain index")
end
while r < i do
local g = glyphs[r]
if g.tag ~= list_tag then
break
end
r = g.remainder
end
if r == i then
return someerror("cycles in chain")
end
nextinsize = r
elseif tag == 3 then
if r >= ne then
return someerror("bad extensible")
end
extensible = extensibles[r] -- remainder ?
remainder = 0
end
end
glyphs[i] = {
width = widths [width],
height = heights[height],
depth = depths [depth],
italic = italics[italic],
tag = tag,
-- index = i,
remainder = remainder,
extensible = extensible,
next = nextinsize,
}
end
end
for i=bc,ec do
local glyph = glyphs[i]
if glyph.tag == 1 then
-- ligature
local k = glyph.remainder
local l = ligatures[k]
if l.skip > 128 then
k = 256 * l.op + l.rem
end
local ligas = { }
local kerns = { }
while true do
local l = ligatures[k]
local skip = l.skip
if skip <= 128 then
local nxt = l.nxt
local op = l.op
local rem = l.rem
if op >= 128 then
local kern = allkerns[256 * (op - 128) + rem]
if nxt == bchar then
kerns[rightboundary] = kern
end
kerns[nxt] = kern
else
local ligature = { type = op * 2 + 1, char = rem }
if nxt == bchar then
ligas[rightboundary] = ligature
end
ligas[nxt] = ligature -- shared
end
end
if skip == 0 then
k = k + 1
else
if skip >= 128 then
break
end
k = k + skip + 1
end
end
if next(kerns)then
glyph.kerns = kerns
glyph.remainder = 0
end
if next(ligas) then
glyph.ligatures = ligas
glyph.remainder = 0
end
end
end
--
if bchar ~= boundarychar then
glyphs[rightboundary] = copy(glyphs[bchar])
end
--
-- for k, v in next, glyphs do
-- v.tag = nil
-- v.remainder = nil
-- end
--
return {
name = file.nameonly(filename),
fontarea = file.pathpart(filename),
glyphs = glyphs,
parameters = parameters,
designsize = designsize,
size = designsize,
direction = direction,
-- checksum = checksum,
-- embedding = "unknown",
-- encodingbytes = 0,
-- extend = 1000,
-- slant = 0,
-- squeeze = 0,
-- format = "unknown",
-- identity = "unknown",
-- mode = 0,
-- streamprovider = 0,
-- tounicode = 0,
-- type = "unknown",
-- units_per_em = 0,
-- used = false,
-- width = 0,
-- writingmode = "unknown",
}
end
end
do
local push = { "push" }
local push = { "pop" }
local w, x, y, z, f
local stack
local s, result, r
local alpha, beta, z
local function scaled1()
local a = readbytes(s,1)
if a == 0 then
return 0
elseif a == 255 then
return - alpha
else
return 0 -- error
end
end
local function scaled2()
local a, b = readbytes(s,2)
local sw = idiv(b*z,beta)
if a == 0 then
return sw
elseif a == 255 then
return sw - alpha
else
return 0 -- error
end
end
local function scaled3()
local a, b, c = readbytes(s,3)
local sw = idiv(rshift(c*z,8)+b*z,beta)
if a == 0 then
return sw
elseif a == 255 then
return sw - alpha
else
return 0 -- error
end
end
local function scaled4()
local a, b, c, d = readbytes(s,4)
local sw = idiv( rshift(rshift(d*z,8)+(c*z),8)+b*z,beta)
if a == 0 then
return sw
elseif a == 255 then
return sw - alpha
else
return 0 -- error
end
end
local function dummy()
end
local actions = {
[128] = function() r = r + 1 result[r] = { "slot", f or 1, readcardinal1(s) } p = p + 1 end,
[129] = function() r = r + 1 result[r] = { "slot", f or 1, readcardinal2(s) } p = p + 2 end,
[130] = function() r = r + 1 result[r] = { "slot", f or 1, readcardinal3(s) } p = p + 3 end,
[131] = function() r = r + 1 result[r] = { "slot", f or 1, readcardinal4(s) } p = p + 4 end,
[132] = function()
r = r + 1
result[r] = { "rule", scaled4(), scaled4() }
p = p + 8
end,
[133] = function()
r = r + 1 result[r] = push
r = r + 1 result[r] = { "slot", f or 1, readcardinal1(s) }
r = r + 1 result[r] = pop
p = p + 1
end,
[134] = function()
r = r + 1 result[r] = push
r = r + 1 result[r] = { "slot", f or 1, readcardinal2(s) }
r = r + 1 result[r] = pop
p = p + 2
end,
[135] = function()
r = r + 1 result[r] = push
r = r + 1 result[r] = { "slot", f or 1, readcardinal2(s) }
r = r + 1 result[r] = pop
p = p + 3
end,
[136] = function()
r = r + 1 result[r] = push
r = r + 1 result[r] = { "slot", f or 1, readcardinal4(s) }
r = r + 1 result[r] = pop
p = p + 4
end,
[137] = function()
r = r + 1 result[r] = push
r = r + 1 result[r] = { "rule", scaled4(), scaled4() }
r = r + 1 result[r] = pop
p = p + 8
end,
[138] = dummy, -- nop
[139] = dummy, -- bop
[140] = dummy, -- eop
[141] = function()
insert(stack, { w, x, y, z })
r = r + 1
result[r] = push
end,
[142] = function()
local t = remove(stack)
if t then
w, x, y, z = t[1], t[2], t[3], t[4]
r = r + 1
result[r] = pop
end
end,
[143] = function() r = r + 1 result[r] = { "right", scaled1() } p = p + 1 end,
[144] = function() r = r + 1 result[r] = { "right", scaled2() } p = p + 2 end,
[145] = function() r = r + 1 result[r] = { "right", scaled3() } p = p + 3 end,
[146] = function() r = r + 1 result[r] = { "right", scaled4() } p = p + 4 end,
[148] = function() w = scaled1() r = r + 1 result[r] = { "right", w } p = p + 1 end,
[149] = function() w = scaled2() r = r + 1 result[r] = { "right", w } p = p + 2 end,
[150] = function() w = scaled3() r = r + 1 result[r] = { "right", w } p = p + 3 end,
[151] = function() w = scaled4() r = r + 1 result[r] = { "right", w } p = p + 4 end,
[153] = function() x = scaled1() r = r + 1 result[r] = { "right", x } p = p + 1 end,
[154] = function() x = scaled2() r = r + 1 result[r] = { "right", x } p = p + 2 end,
[155] = function() x = scaled3() r = r + 1 result[r] = { "right", x } p = p + 3 end,
[156] = function() x = scaled4() r = r + 1 result[r] = { "right", x } p = p + 4 end,
[157] = function() r = r + 1 result[r] = { "down", scaled1() } p = p + 1 end,
[158] = function() r = r + 1 result[r] = { "down", scaled2() } p = p + 2 end,
[159] = function() r = r + 1 result[r] = { "down", scaled3() } p = p + 3 end,
[160] = function() r = r + 1 result[r] = { "down", scaled4() } p = p + 4 end,
[162] = function() y = scaled1() r = r + 1 result[r] = { "down", y } p = p + 1 end,
[163] = function() y = scaled2() r = r + 1 result[r] = { "down", y } p = p + 2 end,
[164] = function() y = scaled3() r = r + 1 result[r] = { "down", y } p = p + 3 end,
[165] = function() y = scaled3() r = r + 1 result[r] = { "down", y } p = p + 4 end,
[167] = function() z = scaled1() r = r + 1 ; result[r] = { "down", z } p = p + 4 end,
[168] = function() z = scaled2() r = r + 1 ; result[r] = { "down", z } p = p + 4 end,
[169] = function() z = scaled3() r = r + 1 ; result[r] = { "down", z } p = p + 4 end,
[170] = function() z = scaled4() r = r + 1 ; result[r] = { "down", z } p = p + 4 end,
[147] = function() r = r + 1 result[r] = { "right", w } end,
[152] = function() r = r + 1 result[r] = { "right", x } end,
[161] = function() r = r + 1 result[r] = { "down", y } end,
[166] = function() r = r + 1 result[r] = { "down", z } end,
[235] = function() f = readcardinal1(s) p = p + 1 end,
[236] = function() f = readcardinal2(s) p = p + 3 end,
[237] = function() f = readcardinal3(s) p = p + 3 end,
[238] = function() f = readcardinal4(s) p = p + 4 end,
[239] = function() local n = readcardinal1(s) r = r + 1 result[r] = { "special", readstring(s,n) } p = p + 1 + n end,
[240] = function() local n = readcardinal2(s) r = r + 1 result[r] = { "special", readstring(s,n) } p = p + 2 + n end,
[241] = function() local n = readcardinal3(s) r = r + 1 result[r] = { "special", readstring(s,n) } p = p + 3 + n end,
[242] = function() local n = readcardinal4(s) r = r + 1 result[r] = { "special", readstring(s,n) } p = p + 4 + n end,
[250] = function() local n = readcardinal1(s) r = r + 1 result[r] = { "pdf", readstring(s,n) } p = p + 1 + n end,
[251] = function() local n = readcardinal2(s) r = r + 1 result[r] = { "pdf", readstring(s,n) } p = p + 2 + n end,
[252] = function() local n = readcardinal3(s) r = r + 1 result[r] = { "pdf", readstring(s,n) } p = p + 3 + n end,
[253] = function() local n = readcardinal4(s) r = r + 1 result[r] = { "pdf", readstring(s,n) } p = p + 4 + n end,
}
table.setmetatableindex(actions,function(t,cmd)
local v
if cmd >= 0 and cmd <= 127 then
v = function()
if f == 0 then
f = 1
end
r = r + 1 ; result[r] = { "slot", f, cmd }
end
elseif cmd >= 171 and cmd <= 234 then
cmd = cmd - 170
v = function()
r = r + 1 ; result[r] = { "font", cmd }
end
else
v = dummy
end
t[cmd] = v
return v
end)
function readers.loadvf(filename,data)
--
local function someerror(m)
if not data then
data = { }
end
data.error = m or "fatal error"
return data
end
--
s = openstream(filename)
if not s then
return someerror()
end
--
local cmd = readcardinal1(s)
if cmd ~= 247 then
return someerror("bad preamble")
end
cmd = readcardinal1(s)
if cmd ~= 202 then
return someerror("bad version")
end
local header = readstring(s,readcardinal1(s))
local checksum = readcardinal4(s)
local designsize = idiv(readcardinal4(s),16)
local fonts = data and data.fonts or { }
local glyphs = data and data.glyphs or { }
--
alpha = 16
z = designsize
while z >= 040000000 do
z = rshift(z,1)
alpha = alpha + alpha
end
beta = idiv(256,alpha)
alpha = alpha * z
--
cmd = readcardinal1(s)
while true do
local n
if cmd == 243 then
n = readcardinal1(s) + 1
elseif cmd == 244 then
n = readcardinal2(s) + 1
elseif cmd == 245 then
n = readcardinal3(s) + 1
elseif cmd == 246 then
n = readcardinal4(s) + 1
else
break
end
local checksum = skipbytes(s,4)
local size = scaled4()
local designsize = idiv(readcardinal4(s),16)
local pathlen = readcardinal1(s)
local namelen = readcardinal1(s)
local path = readstring(s,pathlen)
local name = readstring(s,namelen)
fonts[n] = { path = path, name = name, size = size }
cmd = readcardinal1(s)
end
local index = 0
while cmd and cmd <= 242 do
local width = 0
local length = 0
local checksum = 0
if cmd == 242 then
length = readcardinal4(s)
checksum = readcardinal4(s)
width = readcardinal4(s)
else
length = cmd
checksum = readcardinal1(s)
width = readcardinal3(s)
end
w, x, y, z, f = 0, 0, 0, 0, false
stack, result, r, p = { }, { }, 0, 0
while p < length do
local cmd = readcardinal1(s)
p = p + 1
actions[cmd]()
end
local glyph = glyphs[index]
if glyph then
glyph.width = width
glyph.commands = result
else
glyphs[index] = {
width = width,
commands = result,
}
end
index = index + 1
if #stack > 0 then
-- error: more pushes than pops
end
if packet_length ~= 0 then
-- error: invalid packet length
end
cmd = readcardinal1(s)
end
if readcardinal1(s) ~= 248 then
-- error: no post
end
s, result, r = nil, nil, nil
if data then
data.glyphs = data.glyphs or glyphs
data.fonts = data.fonts or fonts
return data
else
return {
name = file.nameonly(filename),
fontarea = file.pathpart(filename),
glyphs = glyphs,
designsize = designsize,
header = header,
fonts = fonts,
}
end
end
-- the replacement loader (not sparse):
function readers.loadtfmvf(tfmname,size)
local vfname = file.addsuffix(file.nameonly(tfmfile),"vf")
local tfmfile = tfmname
local vffile = resolvers.findbinfile(vfname,"ovf")
if tfmfile and tfmfile ~= "" then
if size < 0 then
size = idiv(65536 * -size,100)
end
local data = readers.loadtfm(tfmfile)
if data.error then
return data
end
if vffile and vffile ~= "" then
data = readers.loadvf(vffile,data)
if data.error then
return data
end
end
local designsize = data.designsize
local glyphs = data.glyphs
local parameters = data.parameters
local fonts = data.fonts
if size ~= designsize then
local factor = size / designsize
for index, glyph in next, glyphs do
if next(glyph) then
glyph.width = round(factor*glyph.width)
glyph.height = round(factor*glyph.height)
glyph.depth = round(factor*glyph.depth)
local italic = glyph.italic
if italic == 0 then
glyph.italic = nil
else
glyph.italic = round(factor*glyph.italic)
end
--
local kerns = glyph.kerns
if kerns then
for index, kern in next, kerns do
kerns[index] = round(factor*kern)
end
end
--
local commands = glyph.commands
if commands then
for i=1,#commands do
local c = commands[i]
local t = c[1]
if t == "down" or t == "right" then
c[2] = round(factor*c[2])
elseif t == "rule" then
c[2] = round(factor*c[2])
c[3] = round(factor*c[3])
end
end
end
else
glyphs[index] = nil
end
end
for i=2,30 do
local p = parameters[i]
if p then
parameters[i] = round(factor*p)
else
break
end
end
if fonts then
for k, v in next, fonts do
v.size = round(factor*v.size)
end
end
else
for index, glyph in next, glyphs do
if next(glyph) then
if glyph.italic == 0 then
glyph.italic = nil
end
else
glyphs[index] = nil
end
end
end
--
parameters.slant = parameters[1]
parameters.space = parameters[2]
parameters.space_stretch = parameters[3]
parameters.space_shrink = parameters[4]
parameters.x_height = parameters[5]
parameters.quad = parameters[6]
parameters.extra_space = parameters[7]
--
for i=1,7 do
parameters[i] = nil -- so no danger for async
end
--
data.characters = glyphs
data.glyphs = nil
data.size = size
-- we assume type1 for now ... maybe the format should be unknown
data.filename = tfmfile -- file.replacesuffix(tfmfile,"pfb")
data.format = "unknown"
--
return data
end
end
end
-- inspect(readers.loadtfmvf(resolvers.findfile("mi-iwonari.tfm")))
-- inspect(readers.loadtfm(resolvers.findfile("texnansi-palatinonova-regular.tfm")))
-- inspect(readers.loadtfm(resolvers.findfile("cmex10.tfm")))
-- inspect(readers.loadtfm(resolvers.findfile("cmr10.tfm")))
-- local t = readers.loadtfmvf("texnansi-lte50019.tfm")
-- inspect(t)
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