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if not modules then modules = { } end modules ['back-pdf'] = {
version = 1.001,
comment = "companion to back-pdf.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- we could do \pdfmatrix sx <> sy <> etc
local sind, cosd, abs = math.sind, math.cosd, math.abs
local insert, remove = table.insert, table.remove
local codeinjections = backends.pdf.codeinjections
local context = context
local scanners = tokens.scanners
local scannumber = scanners.number
local scankeyword = scanners.keyword
local scancount = scanners.count
local scanstring = scanners.string
local scanners = interfaces.scanners
local implement = interfaces.implement
local report = logs.reporter("backend")
local outputfilename
function codeinjections.getoutputfilename()
if not outputfilename then
outputfilename = file.addsuffix(tex.jobname,"pdf")
end
return outputfilename
end
backends.install("pdf")
-- local f_matrix = string.formatters["%F %F %F %F"] -- 0.8 is default
--
-- scanners.pdfrotation = function() -- a
-- -- todo: check for 1 and 0 and flush sparse
-- local a = scannumber()
-- local s, c = sind(a), cosd(a)
-- context(f_matrix(c,s,-s,c))
-- end
-- experimental code (somewhat weird here) .. todo: nodeinjections .. this will only work
-- out well if we also calculate the accumulated cm and wrap inclusions / annotations in
-- the accumulated ... it's a mess
--
-- we could also do the save restore wrapping here + colorhack
local nodepool = nodes.pool
local pdfsave = nodepool.pdfsave
local pdfrestore = nodepool.pdfrestore
local pdfsetmatrix = nodepool.pdfsetmatrix
local stack = { }
local restore = true -- false
local function pdfstopsomething()
local top = remove(stack)
if top == false then
-- not wrapped
elseif top == true then
context(pdfrestore())
elseif top then
context(pdfsetmatrix(unpack(top))) -- not really needed anymore
context(pdfrestore())
else
-- nesting error
end
end
local function pdfstartrotation()
local a = scannumber()
if a == 0 then
insert(stack,false)
else
local s, c = sind(a), cosd(a)
if abs(s) < 0.000001 then
s = 0 -- otherwise funny -0.00000
end
if abs(c) < 0.000001 then
c = 0 -- otherwise funny -0.00000
end
context(pdfsave())
context(pdfsetmatrix(c,s,-s,c))
insert(stack,restore and { c, -s, s, c } or true)
end
end
implement { name = "pdfstartrotation", actions = pdfstartrotation }
implement { name = "pdfstoprotation", actions = pdfstopsomething }
local function pdfstartscaling() -- at the tex end we use sx and sy instead of rx and ry
local rx, ry = 1, 1
while true do
if scankeyword("rx") then
rx = scannumber()
elseif scankeyword("ry") then
ry = scannumber()
-- elseif scankeyword("revert") then
-- local top = stack[#stack]
-- if top then
-- rx = top[1]
-- ry = top[4]
-- else
-- rx = 1
-- ry = 1
-- end
else
break
end
end
if rx == 1 and ry == 1 then
insert(stack,false)
else
if rx == 0 then
rx = 0.0001
end
if ry == 0 then
ry = 0.0001
end
context(pdfsave())
context(pdfsetmatrix(rx,0,0,ry))
insert(stack,restore and { 1/rx, 0, 0, 1/ry } or true)
end
end
implement { name = "pdfstartscaling", actions = pdfstartscaling }
implement { name = "pdfstopscaling", actions = pdfstopsomething }
local function pdfstartmatrix() -- rx sx sy ry -- tx, ty
local rx, sx, sy, ry = 1, 0, 0, 1
while true do
if scankeyword("rx") then rx = scannumber()
elseif scankeyword("ry") then ry = scannumber()
elseif scankeyword("sx") then sx = scannumber()
elseif scankeyword("sy") then sy = scannumber()
else break end
end
if rx == 1 and sx == 0 and sy == 0 and ry == 1 then
insert(stack,false)
else
context(pdfsave())
context(pdfsetmatrix(rx,sx,sy,ry))
insert(stack,store and { -rx, -sx, -sy, -ry } or true)
end
end
implement { name = "pdfstartmatrix", actions = pdfstartmatrix }
implement { name = "pdfstopmatrix", actions = pdfstopsomething }
local function pdfstartmirroring()
context(pdfsetmatrix(-1,0,0,1))
end
implement { name = "pdfstartmirroring", actions = pdfstartmirroring }
implement { name = "pdfstopmirroring", actions = pdfstartmirroring } -- not: pdfstopsomething
if environment.arguments.nocompression then
lpdf.setcompression(0,0,true)
end
-- todo:
implement {
name = "setmapfile",
arguments = "string",
actions = lpdf.setmapfile
}
implement {
name = "setmapline",
arguments = "string",
actions = lpdf.setmapline
}
implement {
name = "setpdfcompression",
arguments = { "integer", "integer" },
actions = lpdf.setcompression,
}
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