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+if not modules then modules = { } end modules ['lpdf-wid'] = {
+ version = 1.001,
+ comment = "companion to lpdf-ini.mkiv",
+ author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+ copyright = "PRAGMA ADE / ConTeXt Development Team",
+ license = "see context related readme files"
+}
+
+-- It's about time to give up on media in pdf and admit that pdf lost it to html.
+-- First we had movies and sound, quite easy to deal with, but obsolete now. Then we
+-- had renditions but they turned out to be unreliable from the start and look
+-- obsolete too or at least they are bound to the (obsolete) flash technology for
+-- rendering. They were already complex constructs. Now we have rich media which
+-- instead of providing a robust future proof framework for general media types
+-- again seems to depend on viewers built in (yes, also kind of obsolete) flash
+-- technology, and we cannot expect this non-open technology to show up in open
+-- browsers. So, in the end we can best just use links to external resources to be
+-- future proof. Just look at the viewer preferences pane to see how fragile support
+-- is. Interestingly u3d support is kind of built in, while e.g. mp4 support relies
+-- on wrapping in swf. We used to stay ahead of the pack with support of the fancy
+-- pdf features but it backfires and is not worth the trouble. And yes, for control
+-- (even simple like starting and stopping videos) one has to revert to JavaScript,
+-- the other fragile bit. And, now that adobe quits flash in 2020 we're without any
+-- video anyway. Also, it won't play on all platforms and devices so let's wait for
+-- html5 media in pdf then.
+
+local tonumber, next = tonumber, next
+local gmatch, gsub, find, lower = string.gmatch, string.gsub, string.find, string.lower
+local filenameonly, basefilename, filesuffix, addfilesuffix = file.nameonly, file.basename, file.suffix, file.addsuffix
+local isfile, modificationtime = lfs.isfile, lfs.modification
+local stripstring = string.strip
+local settings_to_array = utilities.parsers.settings_to_array
+local settings_to_hash = utilities.parsers.settings_to_hash
+local sortedhash, sortedkeys = table.sortedhash, table.sortedkeys
+
+local report_media = logs.reporter("backend","media")
+local report_attachment = logs.reporter("backend","attachment")
+
+local backends = backends
+local lpdf = lpdf
+local nodes = nodes
+local context = context
+
+local texgetcount = tex.getcount
+
+local nodeinjections = backends.pdf.nodeinjections
+local codeinjections = backends.pdf.codeinjections
+local registrations = backends.pdf.registrations
+
+local executers = structures.references.executers
+local variables = interfaces.variables
+
+local v_hidden = variables.hidden
+local v_auto = variables.auto
+local v_embed = variables.embed
+local v_max = variables.max
+local v_yes = variables.yes
+
+local pdfconstant = lpdf.constant
+local pdfnull = lpdf.null
+local pdfdictionary = lpdf.dictionary
+local pdfarray = lpdf.array
+local pdfreference = lpdf.reference
+local pdfunicode = lpdf.unicode
+local pdfstring = lpdf.string
+local pdfboolean = lpdf.boolean
+local pdfaction = lpdf.action
+local pdfborder = lpdf.border
+
+local pdftransparencyvalue = lpdf.transparencyvalue
+local pdfcolorvalues = lpdf.colorvalues
+
+local pdfflushobject
+local pdfflushstreamobject
+local pdfflushstreamfileobject
+local pdfreserveobject
+local pdfpagereference
+local pdfshareobjectreference
+
+updaters.register("backend.update.lpdf",function()
+ pdfflushobject = lpdf.flushobject
+ pdfflushstreamobject = lpdf.flushstreamobject
+ pdfflushstreamfileobject = lpdf.flushstreamfileobject
+ pdfreserveobject = lpdf.reserveobject
+ pdfpagereference = lpdf.pagereference
+ pdfshareobjectreference = lpdf.shareobjectreference
+end)
+
+
+local hpack_node = node.hpack
+local write_node = node.write -- test context(...) instead
+
+-- symbols
+
+local presets = { } -- xforms
+
+local function registersymbol(name,n)
+ presets[name] = pdfreference(n)
+end
+
+local function registeredsymbol(name)
+ return presets[name]
+end
+
+local function presetsymbol(symbol)
+ if not presets[symbol] then
+ context.predefinesymbol { symbol }
+ end
+end
+
+local function presetsymbollist(list)
+ if list then
+ for symbol in gmatch(list,"[^, ]+") do
+ presetsymbol(symbol)
+ end
+ end
+end
+
+codeinjections.registersymbol = registersymbol
+codeinjections.registeredsymbol = registeredsymbol
+codeinjections.presetsymbol = presetsymbol
+codeinjections.presetsymbollist = presetsymbollist
+
+-- comments
+
+-- local symbols = {
+-- Addition = pdfconstant("NewParagraph"),
+-- Attachment = pdfconstant("Attachment"),
+-- Balloon = pdfconstant("Comment"),
+-- Check = pdfconstant("Check Mark"),
+-- CheckMark = pdfconstant("Check Mark"),
+-- Circle = pdfconstant("Circle"),
+-- Cross = pdfconstant("Cross"),
+-- CrossHairs = pdfconstant("Cross Hairs"),
+-- Graph = pdfconstant("Graph"),
+-- InsertText = pdfconstant("Insert Text"),
+-- New = pdfconstant("Insert"),
+-- Paperclip = pdfconstant("Paperclip"),
+-- RightArrow = pdfconstant("Right Arrow"),
+-- RightPointer = pdfconstant("Right Pointer"),
+-- Star = pdfconstant("Star"),
+-- Tag = pdfconstant("Tag"),
+-- Text = pdfconstant("Note"),
+-- TextNote = pdfconstant("Text Note"),
+-- UpArrow = pdfconstant("Up Arrow"),
+-- UpLeftArrow = pdfconstant("Up-Left Arrow"),
+-- }
+
+local attachment_symbols = {
+ Graph = pdfconstant("Graph"),
+ Paperclip = pdfconstant("Paperclip"),
+ Pushpin = pdfconstant("PushPin"),
+}
+
+attachment_symbols.PushPin = attachment_symbols.Pushpin
+attachment_symbols.Default = attachment_symbols.Pushpin
+
+function lpdf.attachmentsymbols()
+ return sortedkeys(comment_symbols)
+end
+
+local comment_symbols = {
+ Comment = pdfconstant("Comment"),
+ Help = pdfconstant("Help"),
+ Insert = pdfconstant("Insert"),
+ Key = pdfconstant("Key"),
+ Newparagraph = pdfconstant("NewParagraph"),
+ Note = pdfconstant("Note"),
+ Paragraph = pdfconstant("Paragraph"),
+}
+
+comment_symbols.NewParagraph = Newparagraph
+comment_symbols.Default = Note
+
+function lpdf.commentsymbols()
+ return sortedkeys(comment_symbols)
+end
+
+local function analyzesymbol(symbol,collection)
+ if not symbol or symbol == "" then
+ return collection and collection.Default, nil
+ elseif collection and collection[symbol] then
+ return collection[symbol], nil
+ else
+ local setn, setr, setd
+ local set = settings_to_array(symbol)
+ if #set == 1 then
+ setn, setr, setd = set[1], set[1], set[1]
+ elseif #set == 2 then
+ setn, setr, setd = set[1], set[1], set[2]
+ else
+ setn, setr, setd = set[1], set[2], set[3]
+ end
+ local appearance = pdfdictionary {
+ N = setn and registeredsymbol(setn),
+ R = setr and registeredsymbol(setr),
+ D = setd and registeredsymbol(setd),
+ }
+ local appearanceref = pdfshareobjectreference(appearance)
+ return nil, appearanceref
+ end
+end
+
+local function analyzenormalsymbol(symbol)
+ local appearance = pdfdictionary {
+ N = registeredsymbol(symbol),
+ }
+ local appearanceref = pdfshareobjectreference(appearance)
+ return appearanceref
+end
+
+codeinjections.analyzesymbol = analyzesymbol
+codeinjections.analyzenormalsymbol = analyzenormalsymbol
+
+local function analyzelayer(layer)
+ -- todo: (specification.layer ~= "" and pdfreference(specification.layer)) or nil, -- todo: ref to layer
+end
+
+local function analyzecolor(colorvalue,colormodel)
+ local cvalue = colorvalue and tonumber(colorvalue)
+ local cmodel = colormodel and tonumber(colormodel) or 3
+ return cvalue and pdfarray { pdfcolorvalues(cmodel,cvalue) } or nil
+end
+
+local function analyzetransparency(transparencyvalue)
+ local tvalue = transparencyvalue and tonumber(transparencyvalue)
+ return tvalue and pdftransparencyvalue(tvalue) or nil
+end
+
+-- Attachments
+
+local nofattachments = 0
+local attachments = { }
+local filestreams = { }
+local referenced = { }
+local ignorereferenced = true -- fuzzy pdf spec .. twice in attachment list, can become an option
+local tobesavedobjrefs = utilities.storage.allocate()
+local collectedobjrefs = utilities.storage.allocate()
+local permitted = true
+local enabled = true
+
+function codeinjections.setattachmentsupport(option)
+ if option == false then
+ permitted = false
+ enabled = false
+ end
+end
+
+local fileobjreferences = {
+ collected = collectedobjrefs,
+ tobesaved = tobesavedobjrefs,
+}
+
+job.fileobjreferences = fileobjreferences
+
+local function initializer()
+ collectedobjrefs = job.fileobjreferences.collected or { }
+ tobesavedobjrefs = job.fileobjreferences.tobesaved or { }
+end
+
+job.register('job.fileobjreferences.collected', tobesavedobjrefs, initializer)
+
+local function flushembeddedfiles()
+ if enabled and next(filestreams) then
+ local e = pdfarray()
+ local f = pdfarray()
+ for tag, reference in sortedhash(filestreams) do
+ if not reference then
+ report_attachment("unreferenced file, tag %a",tag)
+ elseif referenced[tag] == "hidden" then
+ e[#e+1] = pdfstring(tag)
+ e[#e+1] = reference -- already a reference
+ f[#f+1] = reference -- collect all file description references
+ else
+ -- messy spec ... when annot not in named else twice in menu list acrobat
+ f[#f+1] = reference
+ end
+ end
+ if #e > 0 then
+ lpdf.addtonames("EmbeddedFiles",pdfreference(pdfflushobject(pdfdictionary{ Names = e })))
+ end
+ if #f > 0 then -- PDF/A-2|3: all associated files must have a relationship to the PDF document (global or part)
+ lpdf.addtocatalog("AF", pdfreference(pdfflushobject(f))) -- global (Catalog)
+ end
+ end
+end
+
+lpdf.registerdocumentfinalizer(flushembeddedfiles,"embeddedfiles")
+
+function codeinjections.embedfile(specification)
+ if enabled then
+ local data = specification.data
+ local filename = specification.file
+ local name = specification.name or ""
+ local title = specification.title or ""
+ local hash = specification.hash or filename
+ local keepdir = specification.keepdir -- can change
+ local usedname = specification.usedname
+ local filetype = specification.filetype
+ local compress = specification.compress
+ local mimetype = specification.mimetype or specification.mime
+ if filename == "" then
+ filename = nil
+ end
+ if compress == nil then
+ compress = true
+ end
+ if data then
+ local r = filestreams[hash]
+ if r == false then
+ return nil
+ elseif r then
+ return r
+ elseif not filename then
+ filename = specification.tag
+ if not filename or filename == "" then
+ filename = specification.registered
+ end
+ if not filename or filename == "" then
+ filename = hash
+ end
+ end
+ else
+ if not filename then
+ return nil
+ end
+ local r = filestreams[hash]
+ if r == false then
+ return nil
+ elseif r then
+ return r
+ else
+ local foundname = resolvers.findbinfile(filename) or ""
+ if foundname == "" or not isfile(foundname) then
+ filestreams[filename] = false
+ return nil
+ else
+ specification.foundname = foundname
+ end
+ end
+ end
+ -- needs to be cleaned up:
+ usedname = usedname ~= "" and usedname or filename or name
+ local basename = keepdir == true and usedname or basefilename(usedname)
+ local basename = gsub(basename,"%./","")
+ local savename = name ~= "" and name or basename
+ local foundname = specification.foundname or filename
+ if not filetype or filetype == "" then
+ filetype = name and (filename and filesuffix(filename)) or "txt"
+ end
+ savename = addfilesuffix(savename,filetype) -- type is mandate for proper working in viewer
+ local a = pdfdictionary {
+ Type = pdfconstant("EmbeddedFile"),
+ Subtype = mimetype and mimetype ~= "" and pdfconstant(mimetype) or nil,
+ }
+ local f
+ if data then
+ f = pdfflushstreamobject(data,a)
+ specification.data = true -- signal that still data but already flushed
+ else
+ local attributes = lfs.attributes(foundname)
+ local modification = modificationtime(foundname)
+ a.Params = {
+ Size = attributes.size,
+ ModDate = lpdf.pdftimestamp(modification),
+ }
+ f = pdfflushstreamfileobject(foundname,a,compress)
+ end
+ local d = pdfdictionary {
+ Type = pdfconstant("Filespec"),
+ F = pdfstring(savename),
+ -- UF = pdfstring(savename),
+ UF = pdfunicode(savename),
+ EF = pdfdictionary { F = pdfreference(f) },
+ Desc = title ~= "" and pdfunicode(title) or nil,
+ AFRelationship = pdfconstant("Unspecified"), -- Supplement, Data, Source, Alternative, Data
+ }
+ local r = pdfreference(pdfflushobject(d))
+ filestreams[hash] = r
+ return r
+ end
+end
+
+function nodeinjections.attachfile(specification)
+ if enabled then
+ local registered = specification.registered or "<unset>"
+ local data = specification.data
+ local hash
+ local filename
+ if data then
+ hash = md5.HEX(data)
+ else
+ filename = specification.file
+ if not filename or filename == "" then
+ report_attachment("no file specified, using registered %a instead",registered)
+ filename = registered
+ specification.file = registered
+ end
+ local foundname = resolvers.findbinfile(filename) or ""
+ if foundname == "" or not isfile(foundname) then
+ report_attachment("invalid filename %a, ignoring registered %a",filename,registered)
+ return nil
+ else
+ specification.foundname = foundname
+ end
+ hash = filename
+ end
+ specification.hash = hash
+ nofattachments = nofattachments + 1
+ local registered = specification.registered or ""
+ local title = specification.title or ""
+ local subtitle = specification.subtitle or ""
+ local author = specification.author or ""
+ local onlyname = filename and filenameonly(filename) or ""
+ if registered == "" then
+ registered = filename
+ end
+ if author == "" and title ~= "" then
+ author = title
+ title = onlyname or ""
+ end
+ if author == "" then
+ author = onlyname or "<unknown>"
+ end
+ if title == "" then
+ title = registered
+ end
+ if title == "" and filename then
+ title = onlyname
+ end
+ local aref = attachments[registered]
+ if not aref then
+ aref = codeinjections.embedfile(specification)
+ attachments[registered] = aref
+ end
+ local reference = specification.reference
+ if reference and aref then
+ tobesavedobjrefs[reference] = aref[1]
+ end
+ if not aref then
+ report_attachment("skipping attachment, registered %a",registered)
+ -- already reported
+ elseif specification.method == v_hidden then
+ referenced[hash] = "hidden"
+ else
+ referenced[hash] = "annotation"
+ local name, appearance = analyzesymbol(specification.symbol,attachment_symbols)
+ local flags = specification.flags or 0 -- to keep it expandable
+ local d = pdfdictionary {
+ Subtype = pdfconstant("FileAttachment"),
+ FS = aref,
+ Contents = pdfunicode(title),
+ Name = name,
+ NM = pdfstring("attachment:"..nofattachments),
+ T = author ~= "" and pdfunicode(author) or nil,
+ Subj = subtitle ~= "" and pdfunicode(subtitle) or nil,
+ C = analyzecolor(specification.colorvalue,specification.colormodel),
+ CA = analyzetransparency(specification.transparencyvalue),
+ AP = appearance,
+ OC = analyzelayer(specification.layer),
+ -- F = pdfnull(), -- another rediculous need to satisfy validation
+ F = bit32.band(bit32.bor(flags,4),(1023-1-2-32-256)), -- set 3, clear 1,2,6,9; PDF 32000-1, p385
+ }
+ local width = specification.width or 0
+ local height = specification.height or 0
+ local depth = specification.depth or 0
+ local box = hpack_node(nodeinjections.annotation(width,height,depth,d()))
+ box.width = width
+ box.height = height
+ box.depth = depth
+ return box
+ end
+ end
+end
+
+function codeinjections.attachmentid(filename) -- not used in context
+ return filestreams[filename]
+end
+
+-- Comments
+
+local nofcomments = 0
+local usepopupcomments = false
+
+local defaultattributes = {
+ ["xmlns"] = "http://www.w3.org/1999/xhtml",
+ ["xmlns:xfa"] = "http://www.xfa.org/schema/xfa-data/1.0/",
+ ["xfa:contentType"] = "text/html",
+ ["xfa:APIVersion"] = "Acrobat:8.0.0",
+ ["xfa:spec"] = "2.4",
+}
+
+local function checkcontent(text,option)
+ if option and option.xml then
+ local root = xml.convert(text)
+ if root and not root.er then
+ xml.checkbom(root)
+ local body = xml.first(root,"/body")
+ if body then
+ local at = body.at
+ for k, v in next, defaultattributes do
+ if not at[k] then
+ at[k] = v
+ end
+ end
+ -- local content = xml.textonly(root)
+ local richcontent = xml.tostring(root)
+ return nil, pdfunicode(richcontent)
+ end
+ end
+ end
+ return pdfunicode(text)
+end
+
+function nodeinjections.comment(specification) -- brrr: seems to be done twice
+ nofcomments = nofcomments + 1
+ local text = specification.data or ""
+ if specification.space ~= v_yes then
+ text = stripstring(text)
+ text = gsub(text,"[\n\r] *","\n")
+ end
+ text = gsub(text,"\r","\n")
+ local name, appearance = analyzesymbol(specification.symbol,comment_symbols)
+ local tag = specification.tag or "" -- this is somewhat messy as recent
+ local title = specification.title or "" -- versions of acrobat see the title
+ local subtitle = specification.subtitle or "" -- as author
+ local author = specification.author or ""
+ local option = settings_to_hash(specification.option or "")
+ if author ~= "" then
+ if subtitle == "" then
+ subtitle = title
+ elseif title ~= "" then
+ subtitle = subtitle .. ", " .. title
+ end
+ title = author
+ end
+ if title == "" then
+ title = tag
+ end
+ local content, richcontent = checkcontent(text,option)
+ local d = pdfdictionary {
+ Subtype = pdfconstant("Text"),
+ Open = option[v_max] and pdfboolean(true) or nil,
+ Contents = content,
+ RC = richcontent,
+ T = title ~= "" and pdfunicode(title) or nil,
+ Subj = subtitle ~= "" and pdfunicode(subtitle) or nil,
+ C = analyzecolor(specification.colorvalue,specification.colormodel),
+ CA = analyzetransparency(specification.transparencyvalue),
+ OC = analyzelayer(specification.layer),
+ Name = name,
+ NM = pdfstring("comment:"..nofcomments),
+ AP = appearance,
+ }
+ local width = specification.width or 0
+ local height = specification.height or 0
+ local depth = specification.depth or 0
+ local box
+ if usepopupcomments then
+ -- rather useless as we can hide/vide
+ local nd = pdfreserveobject()
+ local nc = pdfreserveobject()
+ local c = pdfdictionary {
+ Subtype = pdfconstant("Popup"),
+ Parent = pdfreference(nd),
+ }
+ d.Popup = pdfreference(nc)
+ box = hpack_node(
+ nodeinjections.annotation(0,0,0,d(),nd),
+ nodeinjections.annotation(width,height,depth,c(),nc)
+ )
+ else
+ box = hpack_node(nodeinjections.annotation(width,height,depth,d()))
+ end
+ box.width = width -- redundant
+ box.height = height -- redundant
+ box.depth = depth -- redundant
+ return box
+end
+
+-- rendering stuff
+--
+-- object_1 -> <</Type /Rendition /S /MR /C << /Type /MediaClip ... >> >>
+-- object_2 -> <</Type /Rendition /S /MR /C << /Type /MediaClip ... >> >>
+-- rendering -> <</Type /Rendition /S /MS [objref_1 objref_2]>>
+--
+-- we only work foreward here (currently)
+-- annotation is to be packed at the tex end
+
+-- aiff audio/aiff
+-- au audio/basic
+-- avi video/avi
+-- mid audio/midi
+-- mov video/quicktime
+-- mp3 audio/x-mp3 (mpeg)
+-- mp4 audio/mp4
+-- mp4 video/mp4
+-- mpeg video/mpeg
+-- smil application/smil
+-- swf application/x-shockwave-flash
+
+-- P media play parameters (evt /BE for controls etc
+-- A boolean (audio)
+-- C boolean (captions)
+-- O boolean (overdubs)
+-- S boolean (subtitles)
+-- PL pdfconstant("ADBE_MCI"),
+
+-- F = flags,
+-- T = title,
+-- Contents = rubish,
+-- AP = irrelevant,
+
+-- sound is different, no window (or zero) so we need to collect them and
+-- force them if not set
+
+local ms, mu, mf = { }, { }, { }
+
+local function delayed(label)
+ local a = pdfreserveobject()
+ mu[label] = a
+ return pdfreference(a)
+end
+
+local function insertrenderingwindow(specification)
+ local label = specification.label
+ -- local openpage = specification.openpage
+ -- local closepage = specification.closepage
+ if specification.option == v_auto then
+ if openpageaction then
+ -- \handlereferenceactions{\v!StartRendering{#2}}
+ end
+ if closepageaction then
+ -- \handlereferenceactions{\v!StopRendering {#2}}
+ end
+ end
+ local actions = nil
+ if openpage or closepage then
+ actions = pdfdictionary {
+ PO = (openpage and lpdfaction(openpage )) or nil,
+ PC = (closepage and lpdfaction(closepage)) or nil,
+ }
+ end
+ local page = tonumber(specification.page) or texgetcount("realpageno") -- todo
+ local r = mu[label] or pdfreserveobject() -- why the reserve here?
+ local a = pdfdictionary {
+ S = pdfconstant("Rendition"),
+ R = mf[label],
+ OP = 0,
+ AN = pdfreference(r),
+ }
+ local bs, bc = pdfborder()
+ local d = pdfdictionary {
+ Subtype = pdfconstant("Screen"),
+ P = pdfreference(pdfpagereference(page)),
+ A = a, -- needed in order to make the annotation clickable (i.e. don't bark)
+ Border = bs,
+ C = bc,
+ AA = actions,
+ }
+ local width = specification.width or 0
+ local height = specification.height or 0
+ if height == 0 or width == 0 then
+ -- todo: sound needs no window
+ end
+ write_node(nodeinjections.annotation(width,height,0,d(),r)) -- save ref
+ return pdfreference(r)
+end
+
+-- some dictionaries can have a MH (must honor) or BE (best effort) capsule
+
+local function insertrendering(specification)
+ local label = specification.label
+ local option = settings_to_hash(specification.option)
+ if not mf[label] then
+ local filename = specification.filename
+ local isurl = find(filename,"://",1,true)
+ local mimetype = specification.mimetype or specification.mime
+ -- local start = pdfdictionary {
+ -- Type = pdfconstant("MediaOffset"),
+ -- S = pdfconstant("T"), -- time
+ -- T = pdfdictionary { -- time
+ -- Type = pdfconstant("Timespan"),
+ -- S = pdfconstant("S"),
+ -- V = 3, -- time in seconds
+ -- },
+ -- }
+ -- local start = pdfdictionary {
+ -- Type = pdfconstant("MediaOffset"),
+ -- S = pdfconstant("F"), -- frame
+ -- F = 100 -- framenumber
+ -- }
+ -- local start = pdfdictionary {
+ -- Type = pdfconstant("MediaOffset"),
+ -- S = pdfconstant("M"), -- mark
+ -- M = "somemark",
+ -- }
+ -- local parameters = pdfdictionary {
+ -- BE = pdfdictionary {
+ -- B = start,
+ -- }
+ -- }
+ -- local parameters = pdfdictionary {
+ -- Type = pdfconstant(MediaPermissions),
+ -- TF = pdfstring("TEMPALWAYS") }, -- TEMPNEVER TEMPEXTRACT TEMPACCESS TEMPALWAYS
+ -- }
+ local descriptor = pdfdictionary {
+ Type = pdfconstant("Filespec"),
+ F = filename,
+ }
+ if isurl then
+ descriptor.FS = pdfconstant("URL")
+ elseif option[v_embed] then
+ descriptor.EF = codeinjections.embedfile {
+ file = filename,
+ mimetype = mimetype, -- yes or no
+ compress = false,
+ }
+ end
+ local clip = pdfdictionary {
+ Type = pdfconstant("MediaClip"),
+ S = pdfconstant("MCD"),
+ N = label,
+ CT = mimetype,
+ Alt = pdfarray { "", "file not found" }, -- language id + message
+ D = pdfreference(pdfflushobject(descriptor)),
+ -- P = pdfreference(pdfflushobject(parameters)),
+ }
+ local rendition = pdfdictionary {
+ Type = pdfconstant("Rendition"),
+ S = pdfconstant("MR"),
+ N = label,
+ C = pdfreference(pdfflushobject(clip)),
+ }
+ mf[label] = pdfreference(pdfflushobject(rendition))
+ end
+end
+
+local function insertrenderingobject(specification) -- todo
+ local label = specification.label
+ if not mf[label] then
+ report_media("unknown medium, label %a",label)
+ local clip = pdfdictionary { -- does not work that well one level up
+ Type = pdfconstant("MediaClip"),
+ S = pdfconstant("MCD"),
+ N = label,
+ D = pdfreference(unknown), -- not label but objectname, hm .. todo?
+ }
+ local rendition = pdfdictionary {
+ Type = pdfconstant("Rendition"),
+ S = pdfconstant("MR"),
+ N = label,
+ C = pdfreference(pdfflushobject(clip)),
+ }
+ mf[label] = pdfreference(pdfflushobject(rendition))
+ end
+end
+
+function codeinjections.processrendering(label)
+ local specification = interactions.renderings.rendering(label)
+ if not specification then
+ -- error
+ elseif specification.type == "external" then
+ insertrendering(specification)
+ else
+ insertrenderingobject(specification)
+ end
+end
+
+function codeinjections.insertrenderingwindow(specification)
+ local label = specification.label
+ codeinjections.processrendering(label)
+ ms[label] = insertrenderingwindow(specification)
+end
+
+local function set(operation,arguments)
+ codeinjections.processrendering(arguments)
+ return pdfdictionary {
+ S = pdfconstant("Rendition"),
+ OP = operation,
+ R = mf[arguments],
+ AN = ms[arguments] or delayed(arguments),
+ }
+end
+
+function executers.startrendering (arguments) return set(0,arguments) end
+function executers.stoprendering (arguments) return set(1,arguments) end
+function executers.pauserendering (arguments) return set(2,arguments) end
+function executers.resumerendering(arguments) return set(3,arguments) end