282 lines
8.1 KiB
Lua
282 lines
8.1 KiB
Lua
local rawset = rawset
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local setdata = node.direct.setdata
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local nodenew = node.direct.new
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local getwhd = node.direct.getwhd
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local setwhd = node.direct.setwhd
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local tonode = node.direct.tonode
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local nodewrite = node.write
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local box_fallback = {
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BleedBox = "CropBox",
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TrimBox = "CropBox",
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ArtBox = "CropBox",
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CropBox = "MediaBox",
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}
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local boxmap = {
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media = "MediaBox",
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crop = "CropBox",
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bleed = "BleedBox",
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trim = "TrimBox",
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art = "ArtBox",
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}
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-- FIXME:
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local function to_sp(bp) return bp*65781.76//1 end
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local function to_bp(sp) return sp/65781.76 end
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local function get_box(page, box)
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box = boxmap[box]
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while box do
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local found = pdfe.getbox(page, box)
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if found then
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return {to_sp(found[1]), to_sp(found[2]), to_sp(found[3]), to_sp(found[4])}
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end
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box = box_fallback[box]
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end
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end
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local function open_pdfe(img)
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local file = pdfe.open(img.filepath)
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do
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local userpassword = img.userpassword
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local ownerpassword = img.ownerpassword
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if userpassword or ownerpassword then
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pdfe.unencrypt(file, userpassword, ownerpassword)
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end
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end
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local status = pdfe.getstatus(file)
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if status >= 0 then
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return file
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elseif status == -1 then
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error[[PDF image is encrypted. Please provide the decryption key.]]
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elseif status == -2 then
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error[[PDF image could not be opened.]]
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else
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assert(false)
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end
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end
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local function scan_pdf(img)
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local file = open_pdfe(img)
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img.imagetype = 'pdf'
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img.pages = pdfe.getnofpages(file)
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img.page = img.page or 1
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if img.page > img.pages then
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error[[Not enough pages in PDF image]]
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end
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local page = pdfe.getpage(file, img.page)
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local bbox = img.bbox or get_box(page, img.pagebox or 'crop') or {0, 0, 0, 0}
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img.bbox = bbox
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img.rotation = (360 - (page.Rotate or 0)) % 360
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assert(img.rotation % 90 == 0, "Invalid /Rotate")
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img.rotation = img.rotation / 90
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if img.rotation < 0 then img.rotation = img.rotation + 4 end
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img.xsize = bbox[3] - bbox[1]
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img.ysize = bbox[4] - bbox[2]
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end
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local pdfe_deepcopy = require'luametalatex-pdfe-deepcopy'
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local function write_pdf(pfile, img)
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local file = open_pdfe(img)
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local page = pdfe.getpage(file, img.page)
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local bbox = img.bbox
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local dict = string.format("/Subtype/Form/BBox[%f %f %f %f]/Resources %s", bbox[1], bbox[2], bbox[3], bbox[4], pdfe_deepcopy(file, img.filepath, pfile, pdfe.getfromdictionary(page, 'Resources')))
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local content, raw = page.Contents
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-- Three cases: Contents is a stream, so copy the stream (Remember to copy filter if necessary)
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-- Contents is an array of streams, so append all the streams as a new stream
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-- Contents is missing. Then create an empty stream.
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local type = pdfe.type(content)
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if type == 'pdfe.stream' then
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raw = true
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for i=1,#content do
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local key, type, value, detail = pdfe.getfromstream(content, i)
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dict = dict .. pdfe_deepcopy(file, img.filepath, pfile, 5, key) .. ' ' .. pdfe_deepcopy(file, img.filepath, pfile, type, value, detail)
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end
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content = content(false)
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elseif type == 'pdfe.array' then
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local array = content
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content = ''
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for i=1,#array do
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content = content .. array[i](true)
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end
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else
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content = ''
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end
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local attr = img.attr
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if attr then
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dict = dict .. attr
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end
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pfile:stream(img.objnum, dict, content, nil, raw)
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end
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local liberal_keys = {height = true, width = true, depth = true, transform = true}
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local real_images = {}
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local function relaxed_newindex(t, k, v)
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if liberal_keys[k] then
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return rawset(t, k, v)
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else
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real_images[t][k] = v
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end
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end
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local function no_newindex(t, k, v)
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if liberal_keys[k] then
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return rawset(t, k, v)
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else
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error(string.format("You are not allowed to set %q in an already scanned image"))
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end
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end
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local function get_underlying(t, k)
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return assert(real_images[t])[k]
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end
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local meta = {__index = get_underlying, __newindex = relaxed_newindex}
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local restricted_meta = {__index = get_underlying, __newindex = no_newindex}
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-- transform isn't documented to be changable but it kind of fits
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local function new(spec)
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local img, real = {}, {}
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real_images[img] = real
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if spec then for k,v in next, spec do
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(liberal_keys[k] and img or real)[k] = v
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end end
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img.depth = img.depth or 0
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return setmetatable(img, meta)
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end
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local function scan(img)
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local m = getmetatable(img)
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local real
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if m == restricted_meta then
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real = real_images[img]
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else
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if m ~= meta then img = new(img) end
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real = real_images[img]
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if real.stream then error[[stream images are not yet supported]] end
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assert(real.filename)
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if not real.filename:match'%.pdf$' then error[[Currently only PDF images are supported]] end
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real.filepath = assert(kpse.find_file(real.filename), "Image not found")
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scan_pdf(real)
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setmetatable(img, restricted_meta)
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end
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img.transform = img.transform or 0
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-- (Re)Set dimensions
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if img.depth and img.height and img.width then
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return img
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end
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local flipped = (img.transform + real.rotation) % 2 == 1
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if not (img.depth or img.height) then img.depth = 0 end
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if not img.width and not (img.height and img.depth) then
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local total_y
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if flipped then
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img.width = real.ysize
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total_y = real.xsize
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else
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img.width = real.xsize
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total_y = real.ysize
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end
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if img.height then
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img.depth = total_y - img.height
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else
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img.height = total_y - img.depth
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end
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else
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local ratio = flipped and real.xsize / real.ysize or real.ysize / real.xsize
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if img.width then
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if img.depth then
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img.height = (ratio * img.width - img.depth) // 1
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else
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img.depth = (ratio * img.width - img.height) // 1
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end
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else
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img.width = ((img.height + img.depth) / ratio) // 1
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end
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end
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return img
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end
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local img_by_objnum = {}
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-- local function img_from_objnum(objnum, img)
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-- img = img or {}
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-- real_images[img] = assert(img_by_objnum[objnum])
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-- return setmetatable(img, restricted_meta)
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-- end
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-- Noop if already reserved
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function reserve(pfile, real)
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local obj = real.objnum or pfile:getobj()
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real.objnum = obj
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img_by_objnum[obj] = real
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return obj
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end
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local function write_img(pfile, img)
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local objnum = reserve(pfile, img)
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if not img.written then
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img.written = true
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write_pdf(pfile, img)
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end
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end
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local function do_img(data, p, n, x, y)
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local img = assert(img_by_objnum[data >> 3], 'Invalid image ID')
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write_img(p.file, img)
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local mirror = data & 4 == 4
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local rotate = (data + img.rotation) & 3
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local width, height, depth = getwhd(n)
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height = height + depth
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local bbox = img.bbox
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local xsize, ysize = img.xsize, img.ysize
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local a, b, c, d, e, f = 1, 0, 0, 1, -bbox[1], -bbox[2]
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if mirror then
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a, e = -a, -e+xsize
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end
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for i=1,rotate do
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a, b, c, d, e, f = -b, a, -d, c, -f+ysize, e
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xsize, ysize = ysize, xsize
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end
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local xscale, yscale = width / xsize, height / ysize
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a, c, e = a*xscale, c*xscale, e*xscale
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b, d, f = b*yscale, d*yscale, f*yscale
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e, f = to_bp(x + e), to_bp(y - depth + f)
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p.resources.XObject['Im' .. tostring(img.objnum)] = img.objnum
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pdf.write('page', string.format('q %f %f %f %f %f %f cm /Im%i Do Q', a, b, c, d, e, f, img.objnum), nil, nil, p)
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end
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local ruleid = node.id'rule'
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local ruletypes = node.subtypes'rule'
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local imagerule
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for n, name in next, ruletypes do
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if name == 'image' then imagerule = n break end
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end
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assert(imagerule)
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local function node(pfile, img)
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img = scan(img)
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local n = nodenew(ruleid, imagerule) -- image
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setdata(n, (reserve(pfile, real_images[img]) << 3) | ((img.transform or 0) & 7))
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setwhd(n, img.width or -0x40000000, img.height or -0x40000000, img.depth or -0x40000000)
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return tonode(n)
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end
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local function write(pfile, img)
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img = scan(img)
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nodewrite(node(pfile, img))
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return img
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end
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local function immediatewrite(pfile, img)
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img = scan(img)
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write_img(pfile, real_images[img])
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return img
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end
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return {
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new = new,
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scan = scan,
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write = write,
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node = node,
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from_num = function(i)
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local img = {}
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real_images[img] = assert(img_by_objnum[i])
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return setmetatable(img, restricted_meta)
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end,
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get_num = function(pfile, img)
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return reserve(pfile, real_images[img])
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end,
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ship = do_img,
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}
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