On 7/1/2013 9:10 PM, Patrick Gundlach wrote:
Hello Hans,
best pack the img in a box and then put some qQ around it with the clip at the
end (the usual experimenting with origin), so basically something compatible to
\pdfliteral {q clip spec}
\pdfximage{...}
\pdfliteral {Q}
ending up in something
that works fine, thank you very much! This is my test code now:
-----------------------
\directlua{
a=node.new("whatsit","pdf_literal")
b=node.new("whatsit","pdf_literal")
a.data = "q 0 w 20 20 m 140 20 l 140 160 l 20 160 l W n "
b.data = "Q"
image = img.scan{filename="cow.pdf"}
i = img.node(image)
node.insert_after(a,a,i)
node.insert_after(a,i,b)
head = node.hpack(a)
tex.box[0] = head
}
\box0
\bye
looks ok to me
-----------------------
I wonder how it compares to the slightly different approach pdflatex uses
(pdftex.def?). If I see it correctly the graphicx package creates an
xobject/form from the bitmap and changes the bounding box there.
i don't know (never looked into it) but maybe it's wrapped twice then,
once as image (form) and as box (form) or maybe they add a crop box in
the resources that then overloads the mediabox
but i guess that the clip is okay (i used that method for years)
Hans
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Hans Hagen | PRAGMA ADE
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