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|
if not modules then modules = { } end modules ['lpdf-fmt'] = {
version = 1.001,
comment = "companion to lpdf-ini.mkiv",
author = "Peter Rolf and Hans Hagen",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files",
}
-- Thanks to Luigi and Steffen for testing.
-- context --directives="backend.format=PDF/X-1a:2001" --trackers=backend.format yourfile
local trace_format = false trackers.register("backend.format", function(v) trace_format = v end)
local trace_variables = false trackers.register("backend.variables", function(v) trace_variables = v end)
local report_backends = logs.new("backends")
local backends, lpdf = backends, lpdf
local codeinjections = backends.pdf.codeinjections -- normally it is registered
local variables = interfaces.variables
local viewerlayers = attributes.viewerlayers
local colors = attributes.colors
local transparencies = attributes.transparencies
local pdfdictionary = lpdf.dictionary
local pdfarray = lpdf.array
local pdfconstant = lpdf.constant
local pdfreference = lpdf.reference
local pdfflushobject = lpdf.flushobject
local pdfstring = lpdf.string
local pdfverbose = lpdf.verbose
local pdfobject = lpdf.object
local addtoinfo, injectxmpinfo, insertxmpinfo = lpdf.addtoinfo, lpdf.injectxmpinfo, lpdf.insertxmpinfo
local lower, gmatch, format, find = string.lower, string.gmatch, string.format, string.find
local concat, serialize = table.concat, table.serialize
local settings_to_array, settings_to_hash = utilities.parsers.settings_to_array, utilities.parsers.settings_to_hash
--[[
Comments by Peter:
output intent : only one profile per color space (and device class)
default color space : (theoretically) several profiles per color space possible
The default color space profiles define the current gamuts (part of/all the
colors we have in the document), while the output intent profile declares the
gamut of the output devices (the colors that we get normally a printer or
monitor).
Example:
I have two RGB pictures (both 'painted' in /DeviceRGB) and I declare sRGB as
default color space for one picture and AdobeRGB for the other. As output
intent I use ISO_coated_v2_eci.icc.
If I had more than one output intent profile for the combination CMYK/printer I
can't decide which one to use. But it is no problem to use several default color
space profiles for the same color space as it's just a different color
transformation. The relation between picture and profile is clear.
]]--
local channels = {
gray = 1,
grey = 1,
rgb = 3,
cmyk = 4,
}
local prefixes = {
gray = "DefaultGray",
grey = "DefaultGray",
rgb = "DefaultRGB",
cmyk = "DefaultCMYK",
}
local formatspecification, formatname = nil, nil
-- * correspondent document wide flags (write once) needed for permission tests
local formats = utilities.storage.allocate {
["version"] = {
external_icc_profiles = 1.4, -- 'p' in name; URL reference of output intent
jbig2_compression = 1.4,
jpeg2000_compression = 1.5, -- not supported yet
nchannel_colorspace = 1.6, -- 'n' in name; n-channel colorspace support
open_prepress_interface = 1.3, -- 'g' in name; reference to external graphics
optional_content = 1.5,
transparency = 1.4,
object_compression = 1.5,
},
["default"] = {
pdf_version = 1.7, -- todo: block tex primitive
format_name = "default",
xmp_file = "lpdf-pdx.xml",
gray_scale = true,
cmyk_colors = true,
rgb_colors = true,
spot_colors = true,
calibrated_rgb_colors = true, -- unknown
cielab_colors = true, -- unknown
nchannel_colorspace = true, -- unknown
internal_icc_profiles = true, -- controls profile inclusion
external_icc_profiles = true, -- controls profile inclusion
include_intents = true,
open_prepress_interface = true, -- unknown
optional_content = true, -- todo: block at lua level
transparency = true, -- todo: block at lua level
jbig2_compression = true, -- todo: block at lua level
jpeg2000_compression = true, -- todo: block at lua level
inject_metadata = function()
-- nothing
end
},
["pdf/x-1a:2001"] = {
pdf_version = 1.3,
format_name = "PDF/X-1a:2001",
xmp_file = "lpdf-pdx.xml",
gts_flag = "GTS_PDFX",
gray_scale = true,
cmyk_colors = true,
spot_colors = true,
internal_icc_profiles = true,
inject_metadata = function()
addtoinfo("GTS_PDFXVersion","PDF/X-1a:2001")
injectxmpinfo("xml://rdf:RDF","<rdf:Description rdf:about='' xmlns:pdfxid='http://www.npes.org/pdfx/ns/id/'><pdfxid:GTS_PDFXVersion>PDF/X-1a:2001</pdfxid:GTS_PDFXVersion></rdf:Description>",false)
end
},
["pdf/x-1a:2003"] = {
pdf_version = 1.4,
format_name = "PDF/X-1a:2003",
xmp_file = "lpdf-pdx.xml",
gts_flag = "GTS_PDFX",
gray_scale = true,
cmyk_colors = true,
spot_colors = true,
internal_icc_profiles = true,
inject_metadata = function()
addtoinfo("GTS_PDFXVersion","PDF/X-1a:2003")
injectxmpinfo("xml://rdf:RDF","<rdf:Description rdf:about='' xmlns:pdfxid='http://www.npes.org/pdfx/ns/id/'><pdfxid:GTS_PDFXVersion>PDF/X-1a:2003</pdfxid:GTS_PDFXVersion></rdf:Description>",false)
end
},
["pdf/x-3:2002"] = {
pdf_version = 1.3,
format_name = "PDF/X-3:2002",
xmp_file = "lpdf-pdx.xml",
gts_flag = "GTS_PDFX",
gray_scale = true,
cmyk_colors = true,
rgb_colors = true,
calibrated_rgb_colors = true,
spot_colors = true,
cielab_colors = true,
internal_icc_profiles = true,
include_intents = true,
inject_metadata = function()
addtoinfo("GTS_PDFXVersion","PDF/X-3:2002")
end
},
["pdf/x-3:2003"] = {
pdf_version = 1.4,
format_name = "PDF/X-3:2003",
xmp_file = "lpdf-pdx.xml",
gts_flag = "GTS_PDFX",
gray_scale = true,
cmyk_colors = true,
rgb_colors = true,
calibrated_rgb_colors = true,
spot_colors = true,
cielab_colors = true,
internal_icc_profiles = true,
include_intents = true,
jbig2_compression = true,
inject_metadata = function()
addtoinfo("GTS_PDFXVersion","PDF/X-3:2003")
end
},
["pdf/x-4"] = {
pdf_version = 1.6,
format_name = "PDF/X-4",
xmp_file = "lpdf-pdx.xml",
gts_flag = "GTS_PDFX",
gray_scale = true,
cmyk_colors = true,
rgb_colors = true,
calibrated_rgb_colors = true,
spot_colors = true,
cielab_colors = true,
internal_icc_profiles = true,
include_intents = true,
optional_content = true,
transparency = true,
jbig2_compression = true,
jpeg2000_compression = true,
object_compression = true,
inject_metadata = function()
injectxmpinfo("xml://rdf:RDF","<rdf:Description rdf:about='' xmlns:pdfxid='http://www.npes.org/pdfx/ns/id/'><pdfxid:GTS_PDFXVersion>PDF/X-4</pdfxid:GTS_PDFXVersion></rdf:Description>",false)
insertxmpinfo("xml://rdf:Description/xmpMM:InstanceID","<xmpMM:VersionID>1</xmpMM:VersionID>",false)
insertxmpinfo("xml://rdf:Description/xmpMM:InstanceID","<xmpMM:RenditionClass>default</xmpMM:RenditonClass>",false)
end
},
["pdf/x-4p"] = {
pdf_version = 1.6,
format_name = "PDF/X-4p",
xmp_file = "lpdf-pdx.xml",
gts_flag = "GTS_PDFX",
gray_scale = true,
cmyk_colors = true,
rgb_colors = true,
calibrated_rgb_colors = true,
spot_colors = true,
cielab_colors = true,
internal_icc_profiles = true,
external_icc_profiles = true,
include_intents = true,
optional_content = true,
transparency = true,
jbig2_compression = true,
jpeg2000_compression = true,
object_compression = true,
inject_metadata = function()
injectxmpinfo("xml://rdf:RDF","<rdf:Description rdf:about='' xmlns:pdfxid='http://www.npes.org/pdfx/ns/id/'><pdfxid:GTS_PDFXVersion>PDF/X-4p</pdfxid:GTS_PDFXVersion></rdf:Description>",false)
insertxmpinfo("xml://rdf:Description/xmpMM:InstanceID","<xmpMM:VersionID>1</xmpMM:VersionID>",false)
insertxmpinfo("xml://rdf:Description/xmpMM:InstanceID","<xmpMM:RenditionClass>default</xmpMM:RenditonClass>",false)
end
},
["pdf/x-5g"] = {
pdf_version = 1.6,
format_name = "PDF/X-5g",
xmp_file = "lpdf-pdx.xml",
gts_flag = "GTS_PDFX",
gray_scale = true,
cmyk_colors = true,
rgb_colors = true,
calibrated_rgb_colors = true,
spot_colors = true,
cielab_colors = true,
internal_icc_profiles = true,
include_intents = true,
open_prepress_interface = true,
optional_content = true,
transparency = true,
jbig2_compression = true,
jpeg2000_compression = true,
object_compression = true,
inject_metadata = function()
-- todo
end
},
["pdf/x-5pg"] = {
pdf_version = 1.6,
format_name = "PDF/X-5pg",
xmp_file = "lpdf-pdx.xml",
gts_flag = "GTS_PDFX",
gray_scale = true,
cmyk_colors = true,
rgb_colors = true,
calibrated_rgb_colors = true,
spot_colors = true,
cielab_colors = true,
internal_icc_profiles = true,
external_icc_profiles = true,
include_intents = true,
open_prepress_interface = true,
optional_content = true,
transparency = true,
jbig2_compression = true,
jpeg2000_compression = true,
object_compression = true,
inject_metadata = function()
-- todo
end
},
["pdf/x-5n"] = {
pdf_version = 1.6,
format_name = "PDF/X-5n",
xmp_file = "lpdf-pdx.xml",
gts_flag = "GTS_PDFX",
gray_scale = true,
cmyk_colors = true,
rgb_colors = true,
calibrated_rgb_colors = true,
spot_colors = true,
cielab_colors = true,
internal_icc_profiles = true,
include_intents = true,
optional_content = true,
transparency = true,
jbig2_compression = true,
jpeg2000_compression = true,
nchannel_colorspace = true,
object_compression = true,
inject_metadata = function()
-- todo
end
},
["pdf/a-1a:2005"] = {
pdf_version = 1.4,
format_name = "pdf/a-1a:2005",
xmp_file = "lpdf-pda.xml",
gts_flag = "GTS_PDFA1",
gray_scale = true,
cmyk_colors = true,
rgb_colors = true,
spot_colors = true,
calibrated_rgb_colors = true, -- unknown
cielab_colors = true, -- unknown
include_intents = true,
forms = true, -- NEW; forms are allowed (with limitations); no JS, other restrictions are unknown (TODO)
tagging = true, -- NEW; the only difference to PDF/A-1b
internal_icc_profiles = true,
inject_metadata = function()
injectxmpinfo("xml://rdf:RDF","<rdf:Description rdf:about='' xmlns:pdfaid='http://www.aiim.org/pdfa/ns/id/'><pdfaid:part>1</pdfaid:part><pdfaid:conformance>A</pdfaid:conformance></rdf:Description>",false)
end
},
["pdf/a-1b:2005"] = {
pdf_version = 1.4,
format_name = "pdf/a-1b:2005",
xmp_file = "lpdf-pda.xml",
gts_flag = "GTS_PDFA1",
gray_scale = true,
cmyk_colors = true,
rgb_colors = true,
spot_colors = true,
calibrated_rgb_colors = true, -- unknown
cielab_colors = true, -- unknown
include_intents = true,
forms = true,
internal_icc_profiles = true,
inject_metadata = function()
injectxmpinfo("xml://rdf:RDF","<rdf:Description rdf:about='' xmlns:pdfaid='http://www.aiim.org/pdfa/ns/id/'><pdfaid:part>1</pdfaid:part><pdfaid:conformance>B</pdfaid:conformance></rdf:Description>",false)
end
},
}
lpdf.formats = formats -- it does not hurt to have this one visible
local filenames = {
"colorprofiles.xml",
"colorprofiles.lua",
}
local function locatefile(filename)
local fullname = resolvers.findfile(filename,"icc")
if not fullname or fullname == "" then
fullname = resolvers.finders.loc(filename) -- could be specific to the project
end
return fullname or ""
end
local function loadprofile(name,filename)
local profile = false
local databases = filename and filename ~= "" and settings_to_array(filename) or filenames
for i=1,#databases do
local filename = locatefile(databases[i])
if filename and filename ~= "" then
local suffix = file.extname(filename)
local lname = lower(name)
if suffix == "xml" then
local xmldata = xml.load(filename) -- no need for caching it
if xmldata then
profile = xml.filter(xmldata,format('xml://profiles/profile/(info|filename)[lower(text())=="%s"]/../table()',lname))
end
elseif suffix == "lua" then
local luadata = loadfile(filename)
luadata = ludata and luadata()
if luadata then
profile = luadata[name] or luadata[lname] -- hashed
if not profile then
for i=1,#luadata do
local li = luadata[i]
if lower(li.info) == lname then -- indexed
profile = li
break
end
end
end
end
end
if profile then
if next(profile) then
report_backends("profile specification '%s' loaded from '%s'",name,filename)
return profile
elseif trace_format then
report_backends("profile specification '%s' loaded from '%s' but empty",name,filename)
end
return false
end
end
end
report_backends("profile specification '%s' not found in '%s'",name,concat(filenames, ", "))
end
local function urls(url)
if not url or url == "" then
return nil
else
local u = pdfarray()
for url in gmatch(url,"([^, ]+)") do
if find(url,"^http") then
u[#u+1] = pdfdictionary {
FS = pdfconstant("URL"),
F = pdfstring(url),
}
end
end
return u
end
end
local function profilename(filename)
return lower(file.basename(filename))
end
local internalprofiles = { }
local function handleinternalprofile(s,include)
local filename, colorspace = s.filename or "", s.colorspace or ""
if filename == "" or colorspace == "" then
report_backends("error in internal profile specification: %s",serialize(s,false))
else
local tag = profilename(filename)
local profile = internalprofiles[tag]
if not profile then
local colorspace = lower(colorspace)
if include then
-- local fullname = resolvers.findctxfile(filename) or ""
local fullname = locatefile(filename)
local channel = channels[colorspace] or nil
if fullname == "" then
report_backends("error, couldn't locate profile '%s'",filename)
elseif not channel then
report_backends("error, couldn't resolve channel entry for colorspace '%s'",colorspace)
else
local a = pdfdictionary { N = channel }
profile = pdfobject { -- does a flush too
compresslevel = 0,
immediate = true, -- !
type = "stream",
file = fullname,
attr = a(),
}
internalprofiles[tag] = profile
if trace_format then
report_backends("including '%s' color profile from '%s'",colorspace,fullname)
end
end
else
internalprofiles[tag] = true
if trace_format then
report_backends("not including '%s' color profile '%s'",colorspace,filename)
end
end
end
return profile
end
end
local externalprofiles = { }
local function handleexternalprofile(s,include) -- specification (include ignored here)
local name, url, filename, checksum, version, colorspace =
s.info or s.filename or "", s.url or "", s.filename or "", s.checksum or "", s.version or "", s.colorspace or ""
if false then -- somehow leads to invalid pdf
local iccprofile = colors.iccprofile(filename)
if iccprofile then
name = name ~= "" and name or iccprofile.tags.desc.cleaned or ""
url = url ~= "" and url or iccprofile.tags.dmnd.cleaned or ""
checksum = checksum ~= "" and checksum or file.checksum(iccprofile.fullname) or ""
version = version ~= "" and version or iccprofile.header.version or ""
colorspace = colorspace ~= "" and colorspace or iccprofile.header.colorspace or ""
end
-- table.print(iccprofile)
end
if name == "" or url == "" or checksum == "" or version == "" or colorspace == "" or filename == "" then
local profile = handleinternalprofile(s)
if profile then
report_backends("incomplete external profile specification, falling back to internal")
else
report_backends("error in external profile specification: %s",serialize(s,false))
end
else
local tag = profilename(filename)
local profile = externalprofiles[tag]
if not profile then
local d = pdfdictionary {
ProfileName = name, -- not file name!
ProfileCS = colorspace,
URLs = urls(url), -- array containing at least one URL
CheckSum = pdfverbose { "<", lower(checksum), ">" }, -- 16byte MD5 hash
ICCVersion = pdfverbose { "<", version, ">" }, -- bytes 8..11 from the header of the ICC profile, as a hex string
}
profile = pdfflushobject(d)
externalprofiles[tag] = profile
end
return profile
end
end
local loadeddefaults = { }
local function handledefaultprofile(s,spec) -- specification
local filename, colorspace = s.filename or "", lower(s.colorspace or "")
if filename == "" or colorspace == "" then
report_backends("error in default profile specification: %s",serialize(s,false))
elseif not loadeddefaults[colorspace] then
local tag = profilename(filename)
local n = internalprofiles[tag] -- or externalprofiles[tag]
if n == true then -- not internalized
report_backends("no default profile '%s' for colorspace '%s'",filename,colorspace)
elseif n then
local a = pdfarray {
pdfconstant("ICCBased"),
pdfreference(n),
}
-- used in page /Resources, so this must be inserted at runtime
lpdf.adddocumentcolorspace(prefixes[colorspace],pdfreference(pdfflushobject(a)))
loadeddefaults[colorspace] = true
report_backends("setting '%s' as default '%s' color space",filename,colorspace)
else
report_backends("no default profile '%s' for colorspace '%s'",filename,colorspace)
end
elseif trace_format then
report_backends("a default '%s' colorspace is already in use",colorspace)
end
end
local loadedintents, intents = { }, pdfarray()
local function handleoutputintent(s,spec)
local name, url, filename, id, outputcondition, info = s.info or s.filename or "", s.url or "", s.filename or "", s.id or "", s.outputcondition or "", s.info or ""
if name == "" or id == "" then
report_backends("error in output intent specification: %s",serialize(s,false))
elseif not loadedintents[name] then
local tag = profilename(filename)
local internal, external = internalprofiles[tag], externalprofiles[tag]
if internal or external then
local d = {
Type = pdfconstant("OutputIntent"),
S = pdfconstant(spec.gts_flag or "GTS_PDFX"),
OutputConditionIdentifier = id,
RegistryName = url,
OutputCondition = outputcondition,
Info = info,
}
if internal and internal ~= true then
d.DestOutputProfile = pdfreference(internal)
elseif external and external ~= true then
d.DestOutputProfileRef = pdfreference(external)
else
report_backends("omitting reference to profile for intent '%s'",name)
end
intents[#intents+1] = pdfreference(pdfflushobject(pdfdictionary(d)))
if trace_format then
report_backends("setting output intent to '%s' with id '%s' (entry %s)",name,id,#intents)
end
else
report_backends("invalid output intent '%s'",name)
end
loadedintents[name] = true
elseif trace_format then
report_backends("an output intent with name '%s' is already in use",name)
end
end
local function handleiccprofile(message,spec,name,filename,how,options,alwaysinclude,gts_flag)
if name and name ~= "" then
local list = settings_to_array(name)
for i=1,#list do
local name = list[i]
local profile = loadprofile(name,filename)
if trace_format then
report_backends("handling %s '%s'",message,name)
end
if profile then
if formatspecification.cmyk_colors then
profile.colorspace = profile.colorspace or "CMYK"
else
profile.colorspace = profile.colorspace or "RGB"
end
local external = formatspecification.external_icc_profiles
local internal = formatspecification.internal_icc_profiles
local include = formatspecification.include_intents
local always, never = options[variables.always], options[variables.never]
if always or alwaysinclude then
if trace_format then
report_backends("forcing internal profiles") -- can make preflight unhappy
end
-- internal, external = true, false
internal, external = not never, false
elseif never then
if trace_format then
report_backends("forcing external profiles") -- can make preflight unhappy
end
internal, external = false, true
end
if external then
if trace_format then
report_backends("handling external profiles cf. '%s'",name)
end
handleexternalprofile(profile,false)
else
if trace_format then
report_backends("handling internal profiles cf. '%s'",name)
end
if internal then
handleinternalprofile(profile,always or include)
else
report_backends("no profile inclusion for '%s'",formatname)
end
end
how(profile,spec)
elseif trace_format then
report_backends("unknown profile '%s'",name)
end
end
end
end
local function flushoutputintents()
if #intents > 0 then
lpdf.addtocatalog("OutputIntents",pdfreference(pdfflushobject(intents)))
end
end
lpdf.registerdocumentfinalizer(flushoutputintents,2,"output intents")
directives.register("backend.format", function(v)
codeinjections.setformat(v)
end)
function codeinjections.setformat(s)
local format, level, profile, intent, option, filename =
s.format or "", s.level or "", s.profile or "", s.intent or "", s.option or "", s.file or ""
if format == "" then
-- we ignore this as we hook it in \everysetupbackend
else
local spec = formats[lower(format)]
if spec then
formatspecification, formatname = spec, spec.format_name
level = level and tonumber(level)
report_backends("setting format to '%s'",formatname)
local xmp_file = formatspecification.xmp_file or ""
if xmp_file == "" then
-- weird error
else
lpdf.setxmpfile(xmp_file)
end
local pdf_version, inject_metadata = spec.pdf_version * 10, spec.inject_metadata
local majorversion, minorversion = math.div(pdf_version,10), math.mod(pdf_version,10)
local objectcompression = spec.object_compression and pdf_version >= 15
local compresslevel = level or tex.pdfcompresslevel -- keep default
local objectcompresslevel = (objectcompression and (level or tex.pdfobjcompresslevel)) or 0
tex.pdfcompresslevel, tex.pdfobjcompresslevel = compresslevel, objectcompresslevel
tex.pdfmajorversion, tex.pdfminorversion = majorversion, minorversion
if objectcompression then
report_backends("forcing pdf version %s.%s, compression level %s, object compression level %s",
majorversion,minorversion,compresslevel,objectcompresslevel)
elseif compresslevel > 0 then
report_backends("forcing pdf version %s.%s, compression level %s, object compression disabled",
majorversion,minorversion,compresslevel)
else
report_backends("forcing pdf version %s.%s, compression disabled",
majorversion,minorversion)
end
--
-- context.setupcolors { -- not this way
-- cmyk = spec.cmyk_colors and variables.yes or variables.no,
-- rgb = spec.rgb_colors and variables.yes or variables.no,
-- }
--
colors.forcesupport(
spec.gray_scale or false,
spec.rgb_colors or false,
spec.cmyk_colors or false,
spec.spot_colors or false,
spec.nchannel_colorspace or false
)
transparencies.forcesupport(
spec.transparency or false
)
viewerlayers.forcesupport(
spec.optional_content or false
)
viewerlayers.setfeatures(
spec.has_order or false -- new
)
--
-- spec.jbig2_compression : todo, block in image inclusion
-- spec.jpeg2000_compression : todo, block in image inclusion
--
if type(inject_metadata) == "function" then
inject_metadata()
end
local options = settings_to_hash(option)
handleiccprofile("color profile",spec,profile,filename,handledefaultprofile,options,true)
handleiccprofile("output intent",spec,intent,filename,handleoutputintent,options,false)
if trace_variables then
for k, v in table.sortedhash(formats.default) do
local v = formatspecification[k]
if type(v) ~= "function" then
report_backends("%s = %s",k,tostring(v or false))
end
end
end
function codeinjections.setformat(noname)
report_backends("error, format is already set to '%s', ignoring '%s'",formatname,noname.format)
end
else
report_backends("error, format '%s' is not supported",format)
end
end
end
function codeinjections.getformatoption(key)
return formatspecification and formatspecification[key]
end
function codeinjections.supportedformats()
local t = { }
for k, v in table.sortedhash(formats) do
if find(k,"pdf") then
t[#t+1] = k
end
end
return t
end
--~ The following is somewhat cleaner but then we need to flag that there are
--~ color spaces set so that the page flusher does not optimize the (at that
--~ moment) still empty array away. So, next(d_colorspaces) should then become
--~ a different test, i.e. also on flag. I'll add that when we need more forward
--~ referencing.
--~
--~ local function embedprofile = handledefaultprofile
--~
--~ local function flushembeddedprofiles()
--~ for colorspace, filename in next, defaults do
--~ embedprofile(colorspace,filename)
--~ end
--~ end
--~
--~ local function handledefaultprofile(s)
--~ defaults[lower(s.colorspace)] = s.filename
--~ end
--~
--~ lpdf.registerdocumentfinalizer(flushembeddedprofiles,1,"embedded color profiles")
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