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if not modules then modules = { } end modules ['font-otr'] = {
version = 1.001,
comment = "companion to font-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- Okay, compressing fonts this way is rather simple but one might wonder what the gain
-- is in this time of 4K youtube movies and most of the web pages wasting space and
-- bandwidth on advertisements. For version 2 we can use "woff2_decompress" from google
-- and in a tex environment one can as well store the ttf/otf files in the tex tree. So,
-- eventually we might even remove this code when version 1 is obsolete.
local ioopen = io.open
local replacesuffix = file.replacesuffix
local readers = fonts and fonts.handlers.otf.readers
local streamreader = readers and readers.streamreader or utilities.files
local streamwriter = readers and readers.streamwriter or utilities.files
local readstring = streamreader.readstring
local readcardinal2 = streamreader.readcardinal2
local readcardinal4 = streamreader.readcardinal4
local writestring = streamwriter.writestring
local writecardinal4 = streamwriter.writecardinal4
local writecardinal2 = streamwriter.writecardinal2
local writebyte = streamwriter.writebyte
local getsize = streamreader.getsize
local setposition = streamreader.setposition
local getposition = streamreader.getposition
local decompress = zlib.decompress
local infotags = {
["os/2"] = true,
["head"] = true,
["maxp"] = true,
["hhea"] = true,
["hmtx"] = true,
["post"] = true,
["cmap"] = true,
}
local report = logs.reporter("fonts","woff")
local runner = sandbox.registerrunner {
name = "woff2otf",
method = "execute",
program = "woff2_decompress",
template = "%inputfile% %outputfile%",
reporter = report,
checkers = {
inputfile = "readable",
outputfile = "writable",
}
}
local function woff2otf(inpname,outname,infoonly)
local outname = outname or replacesuffix(inpname,"otf")
local inp = ioopen(inpname,"rb")
if not inp then
report("invalid input file %a",inpname)
return
end
local signature = readstring(inp,4)
if not (signature == "wOFF" or signature == "wOF2") then
inp:close()
report("invalid signature in %a",inpname)
return
end
local flavor = readstring(inp,4)
if not (flavor == "OTTO" or flavor == "true" or flavor == "\0\1\0\0") then
inp:close()
report("unsupported flavor %a in %a",flavor,inpname)
return
end
if signature == "wOF2" then
inp:close()
if false then
if runner then
runner {
inputfile = inpname,
outputfile = outname,
}
end
return outname, flavor
else
report("skipping version 2 file %a",inpname)
return
end
end
local out = ioopen(outname,"wb")
if not out then
inp:close()
report("invalid output file %a",outname)
return
end
local header = {
signature = signature,
flavor = flavor,
length = readcardinal4(inp),
numtables = readcardinal2(inp),
reserved = readcardinal2(inp),
totalsfntsize = readcardinal4(inp),
majorversion = readcardinal2(inp),
minorversion = readcardinal2(inp),
metaoffset = readcardinal4(inp),
metalength = readcardinal4(inp),
metaoriglength = readcardinal4(inp),
privoffset = readcardinal4(inp),
privlength = readcardinal4(inp),
}
local entries = { }
for i=1,header.numtables do
local entry = {
tag = readstring (inp,4),
offset = readcardinal4(inp),
compressed = readcardinal4(inp),
size = readcardinal4(inp),
checksum = readcardinal4(inp),
}
if not infoonly or infotags[lower(entry.tag)] then
entries[#entries+1] = entry
end
end
local nofentries = #entries
local entryselector = 0 -- we don't need these
local searchrange = 0 -- we don't need these
local rangeshift = 0 -- we don't need these
writestring (out,flavor)
writecardinal2(out,nofentries)
writecardinal2(out,entryselector)
writecardinal2(out,searchrange)
writecardinal2(out,rangeshift)
local offset = 12 + nofentries * 16
local offsets = { }
for i=1,nofentries do
local entry = entries[i]
local size = entry.size
writestring(out,entry.tag)
writecardinal4(out,entry.checksum)
writecardinal4(out,offset) -- the new offset
writecardinal4(out,size)
offsets[i] = offset
offset = offset + size
local p = 4 - offset % 4
if p > 0 then
offset = offset + p
end
end
for i=1,nofentries do
local entry = entries[i]
local offset = offsets[i]
local size = entry.size
setposition(inp,entry.offset+1)
local data = readstring(inp,entry.compressed)
if #data ~= size then
data = decompress(data)
end
setposition(out,offset+1)
writestring(out,data)
local p = 4 - offset + size % 4
if p > 0 then
for i=1,p do
writebyte(out,0)
end
end
end
inp:close()
out:close()
return outname, flavor
end
if readers then
readers.woff2otf = woff2otf
else
return woff2otf
end
|
