104 lines
3.7 KiB
Lua
104 lines
3.7 KiB
Lua
local writer -- = require'luametalatex-nodewriter' -- This would introduce some cyclic dependency
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local pdfvariable = pdf.variable
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-- XForms currently have the form {width, height, depth, objnum, attributes, list, margin}
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local xforms = {}
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local function to_bp(sp) return sp/65781.76 end
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local function shipout(pfile, xform, fontdirs, usedglyphs)
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local list, margin = xform.list, xform.margin
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if not list then return xform.objnum end -- Already shipped out
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local last_page = cur_page cur_page = nil
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local out, resources, annots = writer(pfile, list, fontdirs, usedglyphs)
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cur_page = last_page
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assert(annots == '')
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if pdfvariable.xformattr ~= '' or pdfvariable.xformresources ~= '' then
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texio.write_nl('term and log', 'WARNING (savedboxresource shipout): Ignoring unsupported PDF variables xformattr and xformresources. Specify resources and attributes for specific XForms instead.')
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end
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local dict = string.format('/Subtype/Form/BBox[%f %f %f %f]/Resources<<%s%s>>%s', -to_bp(margin), -to_bp(list.depth+margin), to_bp(list.width+margin), to_bp(list.height+margin), resources, xform.resources or '', xform.attributes or '')
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node.flush_list(list)
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xform.list = nil
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local objnum = pfile:stream(xform.objnum, dict, out)
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xform.objnum = objnum
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return objnum
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end
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local function save(pfile, n, attr, resources, immediate, type, margin, fontdirs, usedglyphs)
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local index = #xforms+1
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local xform = {
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list = assert(n, 'List required for saveboxresource'),
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width = n.width,
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height = n.height,
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depth = n.depth,
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attributes = attr,
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resources = resources,
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margin = margin,
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-- type = type, -- TODO: Not yet used. Do we need this at all?
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}
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xforms[index] = xform
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if immediate then
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shipout(pfile, xform, fontdirs, usedglyphs)
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end
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return index
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end
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local function adjust_sizes(width, height, depth, real_width, real_height, real_depth)
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if not depth then
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if height then
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local scale = height/real_height
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depth = (real_depth*scale + .5)//1
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width = width or (real_width*scale + .5)//1
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elseif width then
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local scale = width/real_width
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depth = (real_depth*scale + .5)//1
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height = (real_height*scale + .5)//1
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else
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width, height, depth = real_width, real_height, real_depth
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end
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elseif height then
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width = width or (real_width*(height+depth)/(real_height+real_depth) + .5)//1
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else
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width = width or real_width
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local scale = width/real_width
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height = ((real_depth+real_height)*scale + .5)//1 - depth
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end
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return width, height, depth
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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 boxrule
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for n, name in next, ruletypes do
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if name == 'box' then boxrule = n break end
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end
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local function use(index, width, height, depth)
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local xform = xforms[index]
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if not xform then return nil, nil, nil, nil end
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width, height, depth = adjust_sizes(width, height, depth, xform.width, xform.height, xform.depth)
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local n = node.direct.new(ruleid, boxrule)
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node.direct.setdata(n, index)
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node.direct.setwhd(n, width, height, depth)
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return node.direct.tonode(n), width, height, depth
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end
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local function do_box(data, p, n, x, y)
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local xform = assert(xforms[data], 'Invalid XForm')
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local objnum = shipout(p.file, xform, p.fontdirs, p.usedglyphs)
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local width, height, depth = node.direct.getwhd(n)
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local xscale, yscale = width / xform.width, (height+depth) / (xform.height+xform.depth)
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p.resources.XObject['Fm' .. tostring(data)] = objnum
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pdf.write('page', string.format('q %f 0 0 %f %f %f cm /Fm%i Do Q',
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xscale, yscale,
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to_bp(x), to_bp(y-depth+yscale*xform.depth),
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data), nil, nil, p)
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end
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return {
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save = save,
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use = use,
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ship = do_box,
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init_nodewriter = function(t, nodewriter) writer, t.init_nodewriter = nodewriter, nil end,
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}
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