publisher.imageinfo() in filters

[pr-apes]

@pgundlach,

I think we already discussed the issue, but I think there could be another approach.

The issue itself is having access to image info data in filters (number of pages, image height and width).

I have just discovered what I think it might be the code for sd:number-of-pages():

publisher/src/lua/publisher/layout_functions.lua

Lines 250 to 254 in 29ea54b

	local function number_of_pages(dataxml,arg )
	local filename = arg[1]
	local img = publisher.imageinfo(filename)
	return img.img.pages
	end

Is there no way to make a function similar to the following one available in filters?

local function number_of_pages(filename)
  local figure = publisher.imageinfo(filename)
  return figure.img.pages
end

If that where possible, this would help to get figure dimensions in filters.

Many thanks for your help.

[pgundlach]

This is not (easily) possible, I am afraid. The number-of-pages() function uses LuaTeX, whereas during the preprocessing state I don't have access to LuaTeX.

[pgundlach]

It could be solved, but a more or less major undertaking.

[pr-apes]

In that case, I will try to solve it in a different way.

Many thanks for your help.