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if not modules then modules = { } end modules ['lpdf-pdx'] = {
version = 1.001,
comment = "companion to lpdf-ini.mkiv",
author = "Peter Rold and Hans Hagen",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files",
}
local codeinjections = backends.codeinjections -- normally it is registered
local variables = interfaces.variables
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 lower, gmatch = string.lower, string.gmatch
local channels = {
gray = 1,
grey = 1,
rgb = 3,
cmyk = 4,
}
local prefixes = {
gray = "DefaultGray",
grey = "DefaultGray",
rgb = "DefaultRGB",
cmyk = "DefaultCMYK",
}
local profiles = { }
local defaults = { }
local intents = pdfarray()
local lastprofile = nil
function codeinjections.useinternalICCprofile(colorspace,filename)
local name = lower(file.basename(filename))
local profile = profiles[name]
if not profile then
local colorspace = lower(colorspace)
local filename = resolvers.findctxfile(filename) or ""
local channel = channels[colorspace]
if channel and filename ~= "" then
local a = pdfdictionary { N = channel }
profile = pdf.obj {
compresslevel = 0,
immediate = true,
type = "stream",
file = filename,
attr = a(),
}
profiles[name] = profile
end
end
lastprofile = profile
return profile
end
function codeinjections.useexternalICCprofile(colorspace,name,urls,checksum,version)
local profile = profiles[name]
if not profile then
local u = pdfarray()
for url in gmatch(urls,"([^, ]+)") do
u[#u+1] = pdfdictionary {
FS = pdfconstant("URL"),
F = pdfstring(url),
}
end
local d = pdfdictionary {
ProfileName = name, -- not file name!
ProfileCS = colorspace,
URLs = u, -- array containing at least one URL
CheckSum = pdfverbose { "<", checksum, ">" }, -- 16byte MD5 hash
ICCVersion = pdfverbose { "<", version, ">" }, -- bytes 8..11 from the header of the ICC profile, as a hex string
}
local n = pdfflushobject(d)
profiles[name] = n
lastprofile = n
return n
end
end
local function embedprofile(colorspace,filename)
local colorspace = lower(colorspace)
local n = codeinjections.useinternaliccprofile(colorspace,filename)
if n then
local a = pdfarray {
pdfconstant("ICCBased"),
pdfreference(n),
}
lpdf.adddocumentcolorspace(prefixes[colorspace],pdfreference(pdfflushobject(a))) -- part of page /Resources
defaults[lower(colorspace)] = filename
end
end
function codeinjections.useICCdefaultprofile(colorspace,filename)
defaults[lower(colorspace)] = filename
end
local function flushembeddedprofiles()
for colorspace, filename in next, defaults do
embedprofile(colorspace,filename)
end
end
function codeinjections.usePDFXoutputintent(id,name,reference,outputcondition,info)
local d = {
Type = pdfconstant("OutputIntent"),
S = pdfconstant("GTS_PDFX"),
OutputConditionIdentifier = id,
RegistryName = name,
OutputCondition = outputcondition,
Info = info,
}
local icc = lastprofile
if reference == variables.yes then
d["DestOutputProfileRef"] = pdfreference(icc)
else
d["DestOutputProfile"] = pdfreference(icc)
end
-- intents[#intents+1] = pdfdictionary(d)
intents[#intents+1] = pdfreference(pdfflushobject(pdfdictionary(d))) -- nicer as separate object
end
local function flushoutputintents()
if #intents > 0 then
lpdf.addtocatalog("OutputIntents",pdfreference(pdfflushobject(intents)))
end
end
lpdf.registerdocumentfinalizer(flushoutputintents,1)
lpdf.registerdocumentfinalizer(flushembeddedprofiles,1)
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