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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 tonumber = tonumber
local sind, cosd = math.sind, math.cosd
local insert, remove = table.insert, table.remove
local codeinjections = backends.pdf.codeinjections
local context = context
local scanners = tokens.scanners
local scanstring = scanners.string
local scannumber = scanners.number
local scaninteger = scanners.integer
local scankeyword = scanners.keyword
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 pdfsave = nodes.pool.pdfsave
local pdfrestore = nodes.pool.pdfrestore
local pdfsetmatrix = nodes.pool.pdfsetmatrix
local stack = { }
local restore = true -- false
scanners.pdfstartrotation = function()
local a = scannumber()
if a == 0 then
insert(stack,false)
else
local s, c = sind(a), cosd(a)
context(pdfsave())
context(pdfsetmatrix(c,s,-s,c))
insert(stack,restore and { c, -s, s, c } or true)
end
end
scanners.pdfstartscaling = function() -- 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
scanners.pdfstartmatrix = function() -- 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
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
scanners.pdfstoprotation = pdfstopsomething
scanners.pdfstopscaling = pdfstopsomething
scanners.pdfstopmatrix = pdfstopsomething
scanners.pdfstartmirroring = function()
context(pdfsetmatrix(-1,0,0,1))
end
if environment.arguments.nocompression then
pdf.setcompresslevel(0)
pdf.setobjcompresslevel(0)
function pdf.setcompresslevel()
-- blocked from now on
end
pdf.setobjcompresslevel = pdf.setcompresslevel
end
scanners.pdfstopmirroring = scanners.pdfstartmirroring
-- todo, change the above to implement too --
implement {
name = "setmapfile",
arguments = "string",
actions = pdf.mapfile
}
implement {
name = "setmapline",
arguments = "string",
actions = pdf.mapline
}
implement {
name = "setpdfcompression",
arguments = { "integer", "integer" },
actions = function(c,o)
pdf.setcompresslevel(c)
pdf.setobjcompresslevel(o)
end
}
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